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@article{faucris.120402964,
abstract = {Five newly functionalized pentaazamacrocyclic manganese complexes, with variable lengths and amounts of the aliphatic groups (three compounds with one linear chain containing 12, 16, and 22 carbon atoms, i.e., MnL1, MnL2, and MnL3, respectively, as well as two compounds containing two C12 and C16 chains, MnL4 and MnL5, respectively) that are derivatives of the known SOD mimetic, Mn(Me-Pyane), have been synthesized. These amphiphilic complexes were characterized by the ESI mass spectrometry, potentiometric titrations, light scattering, cyclic voltammetry, and direct stopped-flow determination of their SOD activity at pH 8.1 and 7.4 (in phosphate and HEPES buffers). The formation of supramolecular aggregates that predominantly exist in the solution as a defined micellar/nanostructure assembly, with an average 400 nm size, has been demonstrated for MnL1. The biological effects of the selected complexes (MnL1 and MnL2) on the superoxide level in cytosol and mitochondria have been tested, as well as their effects on the prevention of the lipid peroxidation induced by paraquat. Advantages and disadvantages of the lipophilic pentaazamacrocyclic manganese SOD mimetics in comparison to the corresponding nonsubstituted SOD active complex have been discussed. © 2013 American Chemical Society.},
author = {Lieb, Dominik and Kenkel, Isabell and Miljkovic, Jan and Moldenhauer, Daniel and Weber, Nadine and Filipovic, Milos and Gröhn, Franziska and Ivanovic-Burmazovic, Ivana},
doi = {10.1021/ic402469t},
faupublication = {yes},
journal = {Inorganic Chemistry},
pages = {1009-1020},
peerreviewed = {Yes},
title = {{Amphiphilic} pentaazamacrocyclic manganese superoxide dismutase mimetics},
volume = {53},
year = {2014}
}
@article{faucris.285690783,
abstract = {Background: Chronic rhinosinusitis without nasal polyps (CRSsNP) represents a phenotype of CRS, whose immunological mechanisms are still unclear. So far there are neither suitable biomarkers to determine the course of the disease nor an individual therapy. Objective: The purpose of this study was to characterize the CRSsNP endotype by identifying and validating non-invasive proteomic biomarkers. Methods: A highly-multiplexed proteomic array consisting of antibodies against 2000 proteins was used to identify proteins that are differentially expressed in the nasal mucus of the CRSsNP and control groups (n = 7 per group). The proteins identified to be most differentially expressed were validated in matched nasal mucus samples using western blots and enzyme-linked immunosorbent assay (ELISA). Validation was also done in a second cohort using western blots (CRSsNP n = 25, control n = 23) and ELISA (n = 30 per group). Additionally, immunohistochemistry in CRSsNP and control tissue samples was performed to characterize the selected proteins further. Results: Out of the 2000 proteins examined, 7 from the most differentially expressed proteins were chosen to be validated. The validation results showed that 4 proteins were significantly upregulated in CRSsNP mucus, including macrophage inflammatory protein-1beta (MIP-1β), resistin, high mobility group box 1 (HMGB1), and forkhead box protein 3 (FOXP3). Cartilage acidic protein 1 (CRTAC1) was not significantly upregulated. Two proteins were significantly downregulated including scavenger receptor class F member 2 (SCARF2) and P-selectin. All proteins selected are mainly associated with inflammation, cell proliferation/differentiation, apoptosis and cell–cell or cell–matrix interaction. Conclusion: Proteomic analysis of CRSsNP and control mucus has confirmed known and revealed novel disease-associated proteins that could potentially serve as a new biosignature for CRSsNP. Analysis of the associated pathways will specify endotypes of CRSsNP and will lead to an improved understanding of the pathophysiology of CRSsNP. Furthermore, our data contribute to the development of a reproducible, non-invasive, and quantitative “liquid biopsy” for rhinosinusitis.},
author = {Pesold, Vanessa and Wendler, Olaf and Morgenthaler, Lisa and Gröhn, Franziska and Mueller, Sarina K.},
doi = {10.1177/19458924221136651},
faupublication = {yes},
journal = {American Journal of Rhinology & Allergy},
keywords = {biomarker; biosignature; chronic rhinosinusitis; chronic rhinosinusitis with nasal polyps; inflammation; microarray; mucus; noninvasive; proteomics; sinusitis},
note = {CRIS-Team Scopus Importer:2022-11-25},
peerreviewed = {Yes},
title = {{Analysis} of {CRSsNP} {Proteome} {Using} a {Highly} {Multiplexed} {Approach} in {Nasal} {Mucus}},
year = {2022}
}
@article{faucris.316778272,
abstract = {Electrostatic self-assembly of macroions is an emerging area with great potential in the development of nanoscale functional objects, where photo-irradiation responsiveness can either elevate or suppress the self-assembly. The ability to control the size and shape of macroion assemblies would greatly facilitate the fabrication of desired nano-objects that can be harnessed in various applications such as catalysis, drug delivery, bio-sensors, and actuators. Here, we demonstrate that a polyelectrolyte with a size of 5 nm and multivalent counterions with a size of 1 nm can produce well-defined nanostructures ranging in size from 10–1000 nm in an aqueous environment by utilizing the concept of electrostatic self-assembly and other intermolecular non-covalent interactions including dipole–dipole interactions. The pH- and photoresponsiveness of polyelectrolytes and azo dyes provide diverse parameters to tune the nanostructures. Our findings demonstrate a facile approach to fabricating and manipulating self-assembled nanoparticles using light and neutron scattering techniques.},
author = {Agarwal, Mohit and Zika, Alexander and Schweins, Ralf and Gröhn, Franziska},
doi = {10.3390/polym16010050},
faupublication = {yes},
journal = {Polymers},
keywords = {electrostatic assembly; kinetically controlled; light irradiation; nanostructures; polyelectrolyte; thermodynamically controlled},
month = {Jan},
note = {CRIS-Team Scopus Importer:2024-01-19},
peerreviewed = {Yes},
title = {{Controlling} the {Morphology} in {Electrostatic} {Self}-{Assembly} via {Light}},
volume = {16},
year = {2024}
}
@article{faucris.106863504,
abstract = {Dendrimer–dye assemblies are used as novel supramolecular nanoreactors for the formation of various gold nanostructures. The organic–inorganic hybrid systems are investigated with dynamic light scattering, UV–vis spectroscopy, and transmission electron microscopy (TEM) as well as cryo-TEM and high-resolution TEM (HRTEM). We show that the shape of the hybrid assemblies is determined by the choice and the ratio of the building blocks. Shape and size of the gold nanoparticles within the assemblies are controlled by the reducing agent. The accessible range of gold morphologies extends from small and spherical, over ellipsoidal, faceted, and large to highly anisotropic. The approach may open the way to new hybrid systems with applications in catalysis or in the biomedical field.},
author = {Düring, Jasmin and Alex, Wiebke and Zika, Alexander and Branscheid, Robert and Spiecker, Erdmann and Gröhn, Franziska},
doi = {10.1021/acs.macromol.7b00752},
faupublication = {yes},
journal = {Macromolecules},
pages = {6998-7009},
peerreviewed = {Yes},
title = {{Dendrimer}-{Dye} {Assemblies} as {Templates} for the {Formation} of {Gold} {Nanostructures}},
volume = {50},
year = {2017}
}
@article{faucris.314051871,
abstract = {Quadruple-switchable nanoscale assemblies are built by combining two types of water-soluble molecular photoswitches through dipole-dipole interaction. Uniting the wavelength-specific proton dissociation of a photoacid and ring-opening of an anionic spirooxazine results in an assembly that can be addressed by irradiation with two different wavelengths: pH and darkness.},
author = {Zika, Alexander and Agarwal, Mohit and Schweins, Ralf and Gröhn, Franziska},
doi = {10.1021/acs.jpclett.3c02392},
faupublication = {yes},
journal = {Journal of Physical Chemistry Letters},
note = {CRIS-Team Scopus Importer:2023-11-17},
pages = {9563-9568},
peerreviewed = {Yes},
title = {{Double}-{Wavelength}-{Switchable} {Molecular} {Self}-{Assembly} of a {Photoacid} and {Spirooxazine} in an {Aqueous} {Solution}},
volume = {14},
year = {2023}
}
@inproceedings{faucris.106929504,
author = {Peters, Gregor and Lodermeyer, Alexander and Kutz, Anne and Gröhn, Franziska and Becker, Stefan},
booktitle = {Fortschritte der Akustik – DAGA 2017 (Kiel, 03/06/17 - 03/09/17)},
faupublication = {yes},
peerreviewed = {unknown},
title = {{Einfluss} der {Stimmlippenoberfläche} und asymmetrischer {Elastizitätsmodule} auf die {Phonation}},
year = {2017}
}
@article{faucris.272774515,
abstract = {We present charge-transfer assemblies of electron accepting, pressure-synthesized carbon nanodots (pCNDs) and an electron donating porphyrin. Amidine derivatization of the porphyrin allows for hydrogen bonding interactions with the carboxyl groups on the surface of pCNDs, which drive the formation of the assembly. Upon photoexcitation, this electron donor-acceptor supramolecular construct features ultrafast charge separation, and subsequent charge recombination in 27 ps.},
author = {Scharl, Tobias and Cadranel, Alejandro and Haines, Philipp and Strauß, Volker and Bernhardt, Sarah and Vela, Sonia and Atienza, Carmen and Gröhn, Franziska and Martin, Nazario and Guldi, Dirk Michael},
doi = {10.1039/c8cc05069d},
faupublication = {yes},
journal = {Chemical Communications},
note = {CRIS-Team Scopus Importer:2022-04-14},
pages = {11642-11644},
peerreviewed = {Yes},
title = {{Fine}-tuning the assemblies of carbon nanodots and porphyrins},
volume = {54},
year = {2018}
}
@article{faucris.123677004,
abstract = {A novel concept for the formation of organic inorganic hybrid nanostructures based on a tunable supra-molecular templating mechanism involving several types of noncovalent interactions is presented. Different organic inorganic hybrid structures with narrow size distributions composed of a cationic dendrimer, an oppositely charged divalent diazo dye, and CdS can be created: First, larger supramolecular structures consisting of several 100 to 1000 dendrimers is built based on ionic and pi-pi interaction. Second, with this self-assembled template, the hybrid nanostructure forms based on electrostatics and coordination interaction. The influence on shape and internal structure of the supramolecular hybrid architectures was investigated. A size control of the assemblies is possible in a range of 60-420 nm. The prospect to direct self-assembly and templating through the controlled combination of different noncovalent interactions potentially allows to create tailor-made systems for various applications.},
author = {Düring, Jasmin and Butz, Benjamin and Spiecker, Erdmann and Gröhn, Franziska},
doi = {10.1021/acs.macromol.5b01165},
faupublication = {yes},
journal = {Macromolecules},
pages = {8399-8411},
peerreviewed = {Yes},
title = {{Formation} of {CdS} in {Supramolecular} {Dendrimer}-{Dye} {Assemblies}: {Electrostatic} and {Electrostatic}-{Coordination} {Templating}},
volume = {48},
year = {2015}
}
@article{faucris.273209364,
abstract = {The design of functional nano-objects by electrostatic self-assembly in solution signifies an emerging field with great potential. More specifically, the targeted combination of electrostatic interaction with other effects and interactions, such as the positioning of charges on stiff building blocks, the use of additional amphiphilic, π−π stacking building blocks, or polyelectrolytes with certain architectures, have recently promulgated electrostatic self-assembly to a principle for versatile defined structure formation. A large variety of architectures from spheres over rods and hollow spheres to networks in the size range of a few tenths to a few hundred nanometers can be formed. This review discusses the state-of-the-art of different approaches of nano-object formation by electrostatic self-assembly against the backdrop of corresponding solid materials and assemblies formed by other non-covalent interactions. In this regard, particularly promising is the facile formation of triggerable structures, i.e. size and shape switching through light, as well as the use of electrostatically assembled nano-objects for improved photocatalysis and the possible solar energy conversion in the future. Lately, this new field is eliciting an increasing amount of understanding; insights and limitations thereof are addressed in this article. Special emphasis is placed on the interconnection of molecular building block structures and the resulting nanoscale architecture via the key of thermodynamics.},
author = {Krieger, Anja and Zika, Alexander and Gröhn, Franziska},
doi = {10.3389/fchem.2021.779360},
faupublication = {yes},
journal = {Frontiers in Chemistry},
keywords = {nanostructures; organic-inorganic hybrids; photocatalysis; self-assembly; stimuli-responsiveness; structure analysis; supramolecular chemistry; thermodynamics},
note = {CRIS-Team Scopus Importer:2022-04-15},
peerreviewed = {Yes},
title = {{Functional} {Nano}-{Objects} by {Electrostatic} {Self}-{Assembly}: {Structure}, {Switching}, and {Photocatalysis}},
volume = {9},
year = {2022}
}
@article{faucris.122226104,
abstract = {Immunglobulin G (IgG) sialylation represents a key checkpoint that determines the engagement of pro- or anti-inflammatory Fcγ receptors (FcγR) and the direction of the immune response. Whether IgG sialylation influences osteoclast differentiation and subsequently bone architecture has not been determined yet, but may represent an important link between immune activation and bone loss. Here we demonstrate that desialylated, but not sialylated, immune complexes enhance osteoclastogenesis in vitro and in vivo. Furthermore, we find that the Fc sialylation state of random IgG and specific IgG autoantibodies determines bone architecture in patients with rheumatoid arthritis. In accordance with these findings, mice treated with the sialic acid precursor N-acetylmannosamine (ManNAc), which results in increased IgG sialylation, are less susceptible to inflammatory bone loss. Taken together, our findings provide a novel mechanism by which immune responses influence the human skeleton and an innovative treatment approach to inhibit immune-mediated bone los},
author = {Harre, Ulrike and Lang, Stefanie and Pfeifle, René and Rombouts, Yoann and Frühbeißer, Sabine and Amara, Khaled and Bang, Holger and Lux, Anja and Koeleman, Carolien A. and Baum, Wolfgang and Dietel, Katharina and Gröhn, Franziska and Malmstroem, Vivianne and Klareskog, Lars and Krönke, Gerhard and Kocijan, Roland and Nimmerjahn, Falk and Toes, Rene E. M. and Herrmann, Martin and Scherer, Hans Ulrich and Schett, Georg},
doi = {10.1038/ncomms7651},
faupublication = {yes},
journal = {Nature Communications},
pages = {6651},
peerreviewed = {Yes},
title = {{Glycosylation} of immunoglobulin {G} determines osteoclast differentiation and bone loss.},
volume = {6},
year = {2015}
}
@article{faucris.315847875,
abstract = {A disulfide-based polymer is used as a template for the synthesis of gold nanoparticles. Three different syntheses are tested: The simultaneous formation of gold nanoparticles and the disulfide polymer (A), the loading of a disulfide polymer matrix with HAuCl4 and then reducing with hydrazine (B), and reducing HAuCl4 with hydrazine in the presence of a cross-linking thiol follows by oxidative coupling of another thiol to the previously formed structures via disulfide bond formation (C). The ratio of the water-insoluble pentaerythritol tetrakis(3-mercaptopropionate) (PETMP) and the water-soluble acids mercaptopropionic acid or mercaptosuccinic acid (MPA or MSA) are varied. The resulting gold nanostructures differ significantly with respect to their synthesis reaching from isolated particles to networks and raspberry-like structures. Due to the formation of disulfide bonds during the syntheses, the response of the hybrid nanoparticles to UV light and ultrasound is investigated, showing a breakdown of micrometer-sized structures to 50 nm-sized hybrid structures in aqueous solution.},
author = {Wagner, Maximilian and Krieger, Anja and Gröhn, Franziska},
doi = {10.1002/macp.202300342},
faupublication = {yes},
journal = {Macromolecular Chemistry and Physics},
keywords = {gold nanoparticles; mechanophores; nanotemplating; organic–inorganic hybrid structures; self-assembly},
note = {CRIS-Team Scopus Importer:2023-12-22},
peerreviewed = {Yes},
title = {{Gold} {Nanoparticles} in {Disulfide} {Based} {Polymer} {Matrices}: {Size}, {Structure} and {Responsivity}},
year = {2023}
}
@article{faucris.280356727,
abstract = {We demonstrate a versatile route to functional multi-component nanostructures by a hierarchical electrostatic nanotemplating - self-assembly approach: CdS-polyelectrolyte-porphyrin structures are formed in aqueous solution. The system was investigated with regard to its photocatalytic activity in different model reactions, and the mechanisms upon excitation were elucidated.},
author = {Wagner, Maximilian and Strassert, Cristian A. and Gröhn, Franziska},
doi = {10.1039/d2nr02132c},
faupublication = {yes},
journal = {Nanoscale},
note = {CRIS-Team WoS Importer:2022-08-12},
peerreviewed = {Yes},
title = {{Hierarchical} electrostatic nanotemplating and self-assembly of electron-transferring hybrid nanostructures: {CdS}-polymer-porphyrin particles},
year = {2022}
}
@article{faucris.288293511,
abstract = {Multi-switchable supramolecular nano-objects that respond to irradiation of different wavelengths with changes in size and shape have been built from two different water-soluble molecular switches, joined by attachment to the same polyelectrolyte. Accordingly, two wavelength-specific reactions, namely the excited-state proton dissociation of a photoacid and the cis-trans isomerization of an azo dye, are combined in one supramolecular nano-object that is stable in aqueous solution. The concept has potential in the fields of sensors, molecular motors, and transport.},
author = {Zika, Alexander and Agarwal, Mohit and Schweins, Ralf and Gröhn, Franziska},
doi = {10.1002/chem.202203373},
faupublication = {yes},
journal = {Chemistry - A European Journal},
note = {CRIS-Team WoS Importer:2023-01-27},
peerreviewed = {Yes},
title = {{Joining} {Two} {Switches} in {One} {Nano}-{Object}: {Photoacidity} and {Photoisomerization} in {Electrostatic} {Self}-{Assembly}},
year = {2022}
}
@article{faucris.212498884,
abstract = {Novel light-responsive nanoassemblies with switchable size and enzymatic activity are built from a protein and a water-soluble spiropyran. Assemblies are created by electrostatic self-assembly in aqueous solution such that the photochromic property of the spiropyran enables light responsiveness. Upon visible light exposure, the aggregate size increases from 200 to 400 nm. The enzyme retains its activity upon aggregation into the assembly, while it decreases through visible light irradiation. Fundamentally, we show how the two different spiropyran isomers, the open-ring merocyanine form and the closed-ring spiropyran form, bind differently to the protein, which triggers the assembly size and use of thermodynamic data to understand the binding process and the size response. Thus, as a proof of concept, a self-assembly driven light-tunable enzyme activity in conjunction with a triggerable assembly size is demonstrated for a model system. The concept bears future potential for various possible biological applications ranging from genetic control over vaccine applications to the detection of certain proteins.},
author = {Moldenhauer, Daniel and Fuenzalida Werner, Juan Pablo and Strassert, Cristian A. and Gröhn, Franziska},
doi = {10.1021/acs.biomac.8b01605},
faupublication = {yes},
journal = {Biomacromolecules},
note = {CRIS-Team WoS Importer:2019-03-06},
pages = {979-991},
peerreviewed = {Yes},
title = {{Light}-{Responsive} {Size} of {Self}-{Assembled} {Spiropyran}-{Lysozyme} {Nanoparticles} with {Enzymatic} {Function}},
volume = {20},
year = {2019}
}
@article{faucris.319730365,
abstract = {Purpose: The purpose of this study was to analyze the nasal lymphatic system in order to uncover novel factors that might be involved in pathogenesis of chronic rhinosinusitis (CRS) with (CRSwNP) and without nasal polyps (CRSsNP). Patients and Methods: Lymphatic vessels (LVs) and macrophages were localized and counted in the inferior and middle turbinate, the uncinate process and the ethmoid of CRSwNP and CRSsNP patients, the NP and the inferior turbinate of controls (n≥6 per group). Lysates of the same tissue types (n=7 per group) were analyzed for lymphatic vessel endothelial receptor 1 (LYVE-1), for matrix metalloproteinase 14 (MMP-14) and for Hyaluronic acid (HA) using ELISA. HA was localized in sections of CRSwNP NP, CRSsNP ethmoid and control inferior turbinate (n=6 per group). The results of HA levels were correlated to the number of macrophages in tissues. The nasal secretions of CRSwNP (n=28), CRSsNP (n=30), and control (n=30) patients were analyzed for LYVE-1 and HA using ELISA. Results: The number of LVs was significantly lower in tissues of both CRS groups compared to the control. In the tissue lysates, LYVE-1 expression differed significantly between the CRSwNP tissues with a particularly high level in the NP. MMP-14 was significantly overexpressed in CRSwNP uncinate process. There were no significant differences in tissue HA expression. In the mucus LYVE-1 was significantly underexpressed in CRSsNP compared to CRSwNP and control, while HA was significantly underexpressed in both CRS groups. In the NP, HA and macrophages were accumulated particularly below the epithelium. Tissue levels of HA revealed a significant positive correlation with the number of macrophages. Conclusion: CRS might be associated with an insufficient clearing of the nasal mucosa through the lymphatics. The accumulation of HA and macrophages might promote inflammation, fluid retention, and polyp formation. These results may provide novel CRS-associated factors.},
author = {Pesold, Vanessa and Wendler, Olaf and Gröhn, Franziska and Mueller, Sarina K.},
doi = {10.2147/JIR.S436450},
faupublication = {yes},
journal = {Journal of Inflammation Research},
keywords = {chronic rhinosinusitis; chronic rhinosinusitis with nasal polyps; hyaluronic acid; inflammation; lymphangiogenesis; mucus},
note = {CRIS-Team Scopus Importer:2024-03-15},
pages = {865-880},
peerreviewed = {Yes},
title = {{Lymphatic} {Vessels} in {Chronic} {Rhinosinusitis}},
volume = {17},
year = {2024}
}
@article{faucris.304990700,
abstract = {Cationic manganese (MnP - [Mn(T4MPyP)]5+) and anionic iron (FeP - [Fe(TDFSPP)]3–) metalloporphyrins in conjunction with zinc oxide of different morphologies, were synthesized. After characterization by different instrumental techniques, the metalloporphyrins were immobilized on the obtained zinc oxide and the catalysts were evaluated regarding the oxidation of cyclohexane, using iodosylbenzene (PhIO) as model oxidant. In the absence of light, the activities of FeP/ZnO were higher than those obtained by neat ZnO and MnP/ZnO. Furthermore, under the reaction conditions of 1:100:1000 catalyst/oxidant/substrate, with acetonitrile as solvent, for 1 h at 25 °C without any radiation source, the reactions were selective for ketone. The same occurred for the neat FeP under homogeneous conditions. In contrast, when the reaction proportions were changed to 1:20:1000 catalyst/oxidant/substrate and when the catalyst amount was increased 10 times, the selectivity was for alcohol. Under irradiation with a dichroic halogen lamp (50 W), all the systems containing FeP showed higher selectivity for alcohol, while when MnP was used, increments like those with FeP were not observed, probably due to the structural differences between FeP and MnP. This FeP to MnP replacement led to spectral differences that might have been responsible for the inability of MnP to interact efficiently with the radiation emitted by the dichroic halogen lamp as well as promoting the higher amount of ketone produced in comparison with the FeP/ZnO system.},
author = {Stival, João Felipe and Marin, Sandra Liliana Albornoz and Zamora, Patricio Guilhermo Peralta and Rebouças, Júlio Santos and Gröhn, Franziska and Bernhardt, Sarah and Wypych, Fernando and Nakagaki, Shirley},
doi = {10.1016/j.apcata.2023.119271},
faupublication = {yes},
journal = {Applied Catalysis A-General},
keywords = {Catalysis; Cyclohexane; Metalloporphyrin; Oxidation; ZnO},
note = {CRIS-Team Scopus Importer:2023-06-09},
peerreviewed = {Yes},
title = {{Metalloporphyrin}/{ZnO} solids as selective catalysts for oxidation reaction assisted by light},
volume = {662},
year = {2023}
}
@article{faucris.280337715,
abstract = {Blue and green emitting methylammonium lead bromide perovskite particles with improved UV-light stability have been developed by tuning structure and stabilization with a mixture of different single- and double-tailed surfactants. The ratio of the long alkyl chain surfactants to the methyl ammonium bromide allows for tailoring of the emission color of ready to use perovskite particles without further purification processes. The combination of single and double tailed surfactants exceeds the properties and geometries of the perovskite particles obtainable with a single surfactant. With a mixture of octylammonium bromide and dimethyldioctadecyl bromide, the perovskite particles show a highly anisotropic shape with a layered pyramid structure. The effect of surfactant composition on the perovskite particles’ structure, morphology and light-emitting properties has been elucidated. As these mixed surfactant perovskites are more robust against UV-light than other perovskite particles, they bear great potential for applications in optical devices such as LEDs.},
author = {Krieger, Anja and Wagner, Maximilian and Gröhn, Franziska},
doi = {10.1016/j.colsurfa.2022.129757},
faupublication = {yes},
journal = {Colloids and Surfaces A-Physicochemical and Engineering Aspects},
keywords = {Hybrid material; Self-assembly; Surfactant, fluorescence, perovskite, cost-effective},
note = {CRIS-Team Scopus Importer:2022-08-12},
peerreviewed = {Yes},
title = {{Mixed}-surfactant perovskites with enhanced photostability},
volume = {652},
year = {2022}
}
@article{faucris.254741633,
abstract = {A disulfide polymer that is triggerable by ultrasound, UV, and redox in aqueous solution and can self-assemble with ionic probe molecules into again multitriggerable assemblies is presented. It is created by oxidative coupling of a branched insoluble thiol to water-soluble ionic thiols. The synthesis via a nanoprecipitation technique results in charged macromolecule particles with adjustable sizes between a few tens and a few hundred nanometers stable in aqueous solution. Macromolecules of different compositions form with pentaerythritol tetrakis(3-mercaptopropionate) as insoluble cross-linkers yielding the polymer backbone, while mercaptopropionic acid, mercaptosuccinic acid, or aminoethane thiol in varying amounts is coupled to the backbone. Molecular and nanoscale switchability of the disulfide macromolecule with UV light, redox potential, and ultrasound is demonstrated. The anionic character of the polymer particles is exploited by electrostatic self-assembly with the tetra-cationic 5,10,15,20-tetrakis-(N-methyl-4-pyridyl)porphyrin and its zinc-metalated derivative, yielding supramolecular composite structures as a model system for delivery. The new type of polymer particles in aqueous solution may pave an alternative way toward multiresponsive and functional materials with potential in medicine and material science.},
author = {Wagner, Maximilian and Krieger, Anja and Minameyer, Martin and Hämisch, Benjamin and Huber, Klaus and Drewello, Thomas and Gröhn, Franziska},
doi = {10.1021/acs.macromol.1c00299},
faupublication = {yes},
journal = {Macromolecules},
note = {CRIS-Team Scopus Importer:2021-04-09},
peerreviewed = {Yes},
title = {{Multiresponsive} polymer nanoparticles based on disulfide bonds},
year = {2021}
}
@article{faucris.251049256,
abstract = {Light- and pH-responsive nano-assemblies with switchable size and structure are formed by the association of a photoacid, anthocyanidin, and a linear polyelectrolyte in aqueous solution. Specifically, anionic disulfonated naphthol derivatives, neutral hydroxyflavylium, and cationic poly(allylamine) are used as building blocks for the ternary electrostatic self-assembly, forming welldefined supramolecular assemblies with tunable sizes of 50 to 500 nm. Due to the network of possible chemical reactions for the anthocyanidin and the excited-state dissociation of the photoacid upon irradiation, different ways to alter the ternary system through external triggering are accessible. The structure and trigger effects can be controlled through the component ratios of the samples. Dynamic and static light scattering (DLS, SLS) and potential measurements were applied to study the size and the stability of the particles, and information on the molecular structure was gained by UV-vis spectroscopy. Isothermal titration calorimetry (ITC) provided information on the thermodynamics and interaction forces in the supramolecular assembly formation.},
author = {Zika, Alexander and Gröhn, Franziska},
doi = {10.3762/BJOC.17.17},
faupublication = {yes},
journal = {Beilstein Journal of Organic Chemistry},
keywords = {Electrostatic self-assembly; Hydroxyflavylium; Multiswitchable; Photoacid; Polyelectrolyte},
month = {Jan},
note = {CRIS-Team Scopus Importer:2021-03-05},
pages = {166-185},
peerreviewed = {Yes},
title = {{Multiswitchable} photoacid-hydroxyflavylium-polyelectrolyte nano-assemblies},
volume = {17},
year = {2021}
}
@article{faucris.108716344,
abstract = {Conformational changes in the conjugated backbone of poly- and oligodiacetylenes (PDAs and ODAs) play an important role in determining the electronic properties of these compounds. At the same time, conformational changes can also result in a folded structure that shows helical chirality. Using D-camphor as a chiral building block, we have designed a high-yielding, iterative synthesis of monodisperse, optically pure cis-oligodiacetylenes (ODAs). cis-ODAs up to the tridecamer have been formed, which is the longest monodisperse cis-ODA reported to date. UV/Vis spectroscopy suggests a large effective conjugation length in THF, likely the result of a linear, planar conformation in this solvent. High-resolution STM/AFM measurements of the nonamer cast from THF onto HOPG show a linear structure. In iPrOH, circular dichroism (CD) spectra suggest the formation of chiral aggregates for ODAs with at least nine D-camphor units, based on a strong CD response. Conformation, conjugation: A series of optically pure, monodisperse cis-oligodiacetylenes (cis-ODAs) based on D-camphor building blocks has been synthesized up to the tridecamer length, which represents the longest cis-ODA reported to date. Optical spectroscopy and STM/AFM measurements indicate that the oligomers assume a linear, planar conformation in THF. Conversely, in iPrOH solution ODAs with n≥9 form chiral aggregates. Copyright © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.},
author = {Chernick, Erin and Börzsönyi, Gabor and Steiner, Christian and Ammon, Maximilian Michael and Geßner, David and Frühbeißer, Sabine and Gröhn, Franziska and Maier, Sabine and Tykwinski, Rik},
doi = {10.1002/anie.201307904},
faupublication = {yes},
journal = {Angewandte Chemie International Edition},
pages = {310-314},
peerreviewed = {Yes},
title = {{Optically} pure, monodisperse cis-oligodiacetylenes: {Aggregation}-induced chirality enhancement},
volume = {53},
year = {2014}
}
@article{faucris.315963037,
abstract = {Electrostatic self-assembly of photoacids with oppositely charged macroions yields supramolecular nano-objects in aqueous solutions, whose size is controlled through light irradiation. Nano-assemblies are formed due to electrostatic attractions and mutual hydrogen bonding of the photoacids. Irradiation with UV light leads to the deprotonation of the photoacid and, consequently, a change in particle size. Overall, the hydrodynamic radii of the well-defined photoacid-macroion nano-objects lie between 130 and 370 nm. For a set of photoacids, we determine the acidity constants in the ground and excited state, discuss the sizes of photoacid-macroion nano-objects (by dynamic and static light scattering), their composition and the particle shapes (by small-angle neutron scattering), and relate their charge characteristics to size, structure and shape. We investigate the association thermodynamics and relate nanoscale structures to thermodynamics and, in turn, thermodynamics to molecular features, particularly the ionization energy of the photoacid hydroxyl group proton. Structure-directing effects completely differ from those for previously investigated systems, with hydrogen bonding and entropic effects playing a major role herein. This combined approach allows developing a comprehensive understanding of assembly formation and photo-response, anchored in molecular parameters (pKa, ionization energy, substituent group location), charge characteristics, and the association enthalpy and entropy. This fundamental understanding again paves the way for tailoring application solutions with novel photoresponsive materials.},
author = {Zika, Alexander and Agarwal, Mohit and Zika, Wiebke and Guldi, Dirk Michael and Schweins, Ralf and Gröhn, Franziska},
doi = {10.1039/d3nr04570f},
faupublication = {yes},
journal = {Nanoscale},
note = {CRIS-Team Scopus Importer:2023-12-29},
peerreviewed = {Yes},
title = {{Photoacid}-macroion assemblies: how photo-excitation switches the size of nano-objects},
year = {2023}
}
@article{faucris.242198995,
abstract = {In this study, light-responsive nano-assemblies with light-switchable size based on photoacids are presented. Anionic disulfonated napthol derivates and cationic dendrimer macroions are used as building blocks for electrostatic self-assembly. Nanoparticles are already formed under the exclusion of light as a result of electrostatic interactions. Upon photoexcitation, an excited-state dissociation of the photoacidic hydroxyl group takes place, which leads to a more highly charged linker molecule and, subsequently, to a change in size and structure of the nano-assemblies. The effects of the charge ratio and the concentration on the stability have been examined with absorption spectroscopy and ζ-potential measurements. The influence of the chemical structure of three isomeric photoacids on the size and shape of the nanoscale aggregates has been studied by dynamic light scattering and atomic force microscopy, revealing a direct correlation of the strength of the photoacid with the changes of the assemblies upon irradiation.},
author = {Zika, Alexander and Bernhardt, Sarah and Gröhn, Franziska},
doi = {10.3390/POLYM12081746},
faupublication = {yes},
journal = {Polymers},
keywords = {Electrostatic self-assembly; Irradiation; Nano-assemblies; Nanostructures; Photoacid; Photoresponsive; Polyelectrolyte; Supramolecular; Switchability},
note = {CRIS-Team Scopus Importer:2020-09-04},
peerreviewed = {Yes},
title = {{Photoresponsive} photoacid-macroion nano-assemblies},
volume = {12},
year = {2020}
}
@article{faucris.282422236,
abstract = {Using electrostatic nanotemplating, a ternary nanostructured system consisting of a poly(styrenesulfonate) microgel and nickel-nickel oxide hybrid particles (PSS-Ni0/NiO) was designed for aqueous catalytic application. The microgel template influences the morphology and increases the stability of the Ni0/NiO catalyst nanoparticles. Spherical Ni0/NiO nanoparticles are contained within the microgel, with additional smaller nanoparticles on its outside. The catalytic oxidation of o-phenylenediamine serves as a model reaction for oxidation catalysis, while the ternary particles may be applied for hydrogen oxidation in fuel cells and as chemical sensors. For structure and performance, the loading ratio and the Ni0-to-NiO ratio are key. },
author = {Bernhardt, Sarah and Wagner, Maximilian and Gröhn, Franziska},
doi = {10.1021/acsanm.2c02595},
faupublication = {yes},
journal = {ACS Applied Nano Materials},
keywords = {catalysis; nanoparticles; nickel; nickel oxide; organic-inorganic hybrid materials; oxidation; poly(styrenesulfonate); polyelectrolyte microgel},
note = {CRIS-Team Scopus Importer:2022-09-30},
peerreviewed = {Yes},
title = {{Polyelectrolyte}-{Microgel}-{Templated} {Nickel}-{Nickel} {Oxide} {Nanoparticles} for {Oxidation} {Catalysis} with o-{Phenylenediamine} as a {Model} {Substrate}},
year = {2022}
}
@article{faucris.295404675,
abstract = {This study focuses on elucidating the structure and catalytic properties of polymer-MoS3 assemblies with various polymers. The polymer-MoS3 particles are synthesized by a bottom-up approach using different non-covalent forces, in particular electrostatic interactions and coordination. The structure and size, depending on the composition of the polymer-MoS3 assemblies, is analyzed by light scattering, spectroscopy and microscopy. The catalytically active assemblies enable a selective degradation of dyes with low HOMO orbitals and the choice of the polymer directs the selectivity with regard to the chemical charge of the probe molecule. The degradation, which also takes place in darkness, can be substantially enhanced with light. Based on variation of the hole scavenger and the amount of catalyst, the mechanism of the catalysis has been determined. This allows an increase in the reaction rate and the reuse of the catalyst for at least ten reaction cycles, which may be exploited for solar-to-chemical energy conversion or wastewater treatment.},
author = {Krieger, Anja and Wagner, Maximilian and Gröhn, Franziska},
doi = {10.1016/j.nanoso.2023.100954},
faupublication = {yes},
journal = {Nano-Structures & Nano-Objects},
keywords = {Catalysis; Molybdenum sulfide; Nanotemplating; Photocatalysis; Self-assembly},
note = {CRIS-Team Scopus Importer:2023-04-07},
peerreviewed = {Yes},
title = {{Polymers} direct selectivity: {Polymer}-nano-{MoS3} catalysts – effective with and without irradiation},
volume = {34},
year = {2023}
}
@article{faucris.308939737,
abstract = {Using electrostatic self-assembly and electrostatic nanotemplating, a quaternary nanostructured system consisting of zinc oxide nanoparticles, gold nanoparticles, poly[3-(potassium-4-butanoate)thiophene-2,5-diyl] (PT), and methyltrioctylammonium chloride (MTOA) (PT-MTOA-ZnO-Au) was designed for aqueous photocatalysis. The PT-MTOA hollow sphere aggregates served as an electrostatic template for both individual inorganic nanoparticles controlling their morphology, stabilizing the nanoparticles, and acting as a photosensitizer. The hybrid structures included spherical ZnO nanoparticles with a diameter of d = 2.6 nm and spherical Au nanoparticles with d = 6.0 nm embedded in PT-MTOA hollow spheres with a hydrodynamic radius of RH = 100 nm. The ZnO nanoparticles acted as the main catalyst, while the Au nanoparticles acted as the cocatalyst. As a photocatalytic model reaction, the dye degradation of methylene blue in aqueous solution using the full spectral range from UV to visible light was tested. The photocatalytic activity was optimized by varying the Zn and Au loading ratios and was substantially enhanced regarding the components; for example, it was increased by about 61% using PT-MTOA-ZnO-Au compared to the composite without gold particles. A photocatalytic mechanism of the methylene blue degradation was proposed when catalyzed by these multicomponent nano-objects. Thus, a simple procedure of templating two different nanoparticle species within the same cocatalytically active template has been demonstrated, which can be extended to other inorganic particles, making a variety of task-specific catalysts accessible.},
author = {Bernhardt, Sarah and Yokosawa, Tadahiro and Spiecker, Erdmann and Gröhn, Franziska},
doi = {10.1021/acs.langmuir.3c00123},
faupublication = {yes},
journal = {Langmuir},
note = {CRIS-Team Scopus Importer:2023-08-11},
peerreviewed = {Yes},
title = {{Polythiophene} as a {Double}-{Electrostatic} {Template} for {Zinc} {Oxide} and {Gold}: {Multicomponent} {Nano}-{Objects} for {Enhanced} {Photocatalysis}},
year = {2023}
}
@article{faucris.210514943,
abstract = {The formation of a novel porphyrin colloidal structure has been investigated-so called microneedles. The porphyrin colloids consist of the tetravalent anionic tetra-(4-sulfonatophenyl)porphyrin (TPPS) and the tetravalent cationic tetra-(N-methyl-4-pyridyl)porphyrin (TMPyP), forming ionic organic solid particles in ethanol. The structure dependence on various influences such as ratio of TMPyP to TPPS, the time of mixing, different solvent mixtures, and the metalation of one porphyrin is investigated with UV-Vis spectroscopy, zeta-potential, light microscopy, and transmission electron microscopy (TEM). The light harvesting potential of the microneedles is demonstrated as a proof of concept by the catalytic degradation of Rose Bengal.},
author = {Düring, Jasmin and Haschke, Sandra and Bachmann, Julien and Gröhn, Franziska},
doi = {10.1007/s00396-018-4333-8},
faupublication = {yes},
journal = {Colloid and Polymer Science},
keywords = {Electrostatic self-assembly;Self-assembly;Porphyrin;Organic crystal;Catalysis},
pages = {1235-1248},
peerreviewed = {Yes},
title = {{Porphyrin} microneedles-structure control and catalytic activity},
volume = {296},
year = {2018}
}
@article{faucris.272773254,
abstract = {ZnO nanoparticles of 2.6 to 4.0 nm in size were interconnected by meso-tetra(4-carboxyphenyl)porphyrin (TCPP) for the realization of novel ZnO–TCPP networks, reaching lateral dimensions ranging from 50 to 800 nm. The resulting ZnO–TCPP networks were probed by dynamic light-scattering experiments, transmission electron microscopy, and spectroscopy, and were also tested as photoactive top layers in TiO2 and ZnO dye-sensitized solar cells (DSSCs). Control over these ZnO–TCPP networks on top of the semiconductor electrodes enables efficiency increases of 10 % and 46 % for TiO2- and ZnO-based photoelectrodes, respectively. In other words, effects, such as reducing the electron recombination and increasing the electron lifetime, document the benefits of using tailored functional hybrid systems in DSSCs.},
author = {Düring, Jasmin and Kunzmann, Andreas and Killian, Manuela and Costa, Ruben Dario and Guldi, Dirk Michael and Gröhn, Franziska},
doi = {10.1002/cptc.201700107},
faupublication = {yes},
journal = {Chemphotochem},
keywords = {dye-sensitized solar cells; electron transfer; hybrid assemblies; porphyrins; semiconductor nanoparticles},
note = {CRIS-Team Scopus Importer:2022-04-14},
pages = {213-222},
peerreviewed = {Yes},
title = {{Porphyrins} as {Multifunctional} {Interconnects} in {Networks} of {ZnO} {Nanoparticles} and their {Application} in {Dye}-{Sensitized} {Solar} {Cells}},
volume = {2},
year = {2018}
}
@article{faucris.106867904,
abstract = {PURPOSE Previous studies have confirmed the influence of dehydration and an altered mucus (e.g., due to pathologies) on phonation. However, the underlying reasons for these influences are not fully understood. This study was a preliminary inquiry into the influences of mucus architecture and concentration on vocal fold oscillation. METHOD Two excised human larynges were investigated in an in vitro setup. The oscillations of the vocal folds at various airflow volume rates were recorded through the use of high-speed imaging. Engineered mucus containing polymers (interconnected polymers and linear polymers) was applied to the vocal folds. From the high-speed footage, glottal parameters were extracted through the use of objective methods and were compared to a gold standard (physiological saline solution). RESULTS Variations were found for all applications of mucus. Fundamental frequency dropped and the oscillatory behavior (speed quotient [SQ], closing quotient [CQ]) changed for both larynges. The 2 applied mucus architectures displayed different effects on the larynges. The interconnected polymer displayed clear low-pass filter characteristics not found for the linear polymer. Increase of polymer concentration affected parameters to a certain point. CONCLUSION The data confirm results found in previous studies. Furthermore, the different effects-comparing architecture and concentration-suggest that, in the future, synthetic mucus can be designed to improve phonation.},
author = {Döllinger, Michael and Gröhn, Franziska and Berry, David A. and Eysholdt, Ulrich and Luegmair, Georg},
doi = {10.1044/2014{\_}JSLHR-S-12-0277},
faupublication = {yes},
journal = {Journal of Speech Language and Hearing Research},
note = {EVALuna2:20187},
pages = {S637-47},
peerreviewed = {Yes},
title = {{Preliminary} results on the influence of engineered artificial mucus layer on phonation},
volume = {57},
year = {2014}
}
@article{faucris.246708419,
abstract = {We present photocatalytically active, stable polymer-amorphous-MoS3-nanoparticle hybrid structures in aqueous solution. Below 10 nm MoS3 particles in the polymer exhibit an up to 7.5-fold increased photocatalytic activity compared to the neat nanoparticles without any additional photosensitizer. Supramolecular interactions are key in directing the structure formation of the hybrid assembly. The hybrid structures bear potential as novel affordable photocatalysts for solar energy conversion.},
author = {Krieger, Anja and Wagner, Maximilian and Haschke, Sandra and Kroeckel, C. and Bachmann, Julien and Hauke, F. and Hirsch, Andreas and Gröhn, Franziska},
doi = {10.1039/d0nr04820h},
faupublication = {yes},
journal = {Nanoscale},
note = {CRIS-Team WoS Importer:2020-12-11},
pages = {22952-22957},
peerreviewed = {Yes},
title = {{Self}-assembled hybrid organic-{MoS3}-nanoparticle catalyst for light energy conversion},
volume = {12},
year = {2020}
}
@article{faucris.107631524,
abstract = {A modular construction kit with two orthogonal noncovalent binding sites for self-assembly of supramolecular architectures is presented. The heteroditopic building blocks contain a terpyridine (tpy) unit for coordination of metal ions and a Hamilton receptor for multiple H-bonding of cyanuric acid derivatives. The association constants of ligand binding of M complexes (M=Ru, Zn, Fe, and Pt) with a dendritic end cap were determined to be in the range of 10 and 10 L mol in chloroform. The capabilities for binding of metal ions were investigated by H NMR and UV/Vis spectroscopy. The Fe complexes are most appropriate for the generation of discrete and high-ordered architectures due to their strong tendency to form FeL complexes. Superstructures are readily formed in a one-pot procedure at room temperature. No mutual interactions between the orthogonal binding motifs were observed, and this demonstrates the highly specific nature of each binding process. Decomplexation experiments were carried out to examine the reversibility of Fe-tpy coordination. Substitution of the terminal end cap with a homoditopic bis-cyanurate linkage leads to formation of an iron-containing supramolecular strand. Formation of coordination polymers was confirmed by viscosity measurements. The supramolecular polymer strands can be reversibly cleaved by addition of a terminating cyanuric acid building block, and this proves the dynamic nature of this noncovalent polymerization process. Copyright © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.},
author = {Grimm, Felix and Ulm, Nadine and Gröhn, Franziska and Düring, Jasmin and Hirsch, Andreas},
doi = {10.1002/chem.201100171},
faupublication = {yes},
journal = {Chemistry - A European Journal},
pages = {9478-9488},
peerreviewed = {Yes},
title = {{Self}-assembly of supramolecular architectures and polymers by orthogonal metal complexation and hydrogen-bonding motifs},
volume = {17},
year = {2011}
}
@article{faucris.258805052,
abstract = {A protecting group strategy was employed to synthesise a series of indolenine squaraine dye oligomers up to the nonamer. The longer oligomers show a distinct solvent dependence of the absorption spectra, that is, either a strong blue shift or a strong red shift of the lowest energy bands in the near infrared spectral region. This behaviour is explained by exciton coupling theory as being due to H- or J-type coupling of transition moments. The H-type coupling is a consequence of a helix folding in solvents with a small Hansen dispersity index. DOSY NMR, small angle neutron scattering (SANS), quantum chemical and force field calculations agree upon a helix structure with an unusually large pitch and open voids that are filled with solvent molecules, thereby forming a kind of clathrate. The thermodynamic parameters of the folding process were determined by temperature dependent optical absorption spectra.},
author = {Turkin, Arthur and Holzapfel, Marco and Agarwal, Mohit and Fischermeier, David and Mitric, Roland and Schweins, Ralf and Gröhn, Franziska and Lambert, Christoph},
doi = {10.1002/chem.202101063},
faupublication = {yes},
journal = {Chemistry - A European Journal},
keywords = {dye chemistry; solvent effects; superstructure; supramolecular folding; UV/Vis spectroscopy},
note = {CRIS-Team Scopus Importer:2021-05-21},
peerreviewed = {Yes},
title = {{Solvent} {Induced} {Helix} {Folding} of {Defined} {Indolenine} {Squaraine} {Oligomers}},
year = {2021}
}
@article{faucris.242409962,
author = {Anaya-Plaza, Eduardo and Joseph, Jan and Bauroth, Stefan and Wagner, Maximilian and Dolle, Christian and Sekita, Michael and Gröhn, Franziska and Spiecker, Erdmann and Clark, Timothy and de la Escosura, Andrés and Guldi, Dirk Michael and Torres, Tomás},
doi = {10.1002/ange.202006014},
faupublication = {yes},
journal = {Angewandte Chemie},
note = {CRIS-Team Scopus Importer:2020-09-11},
peerreviewed = {Yes},
title = {{Synergie} von elektrostatischen und π-π-{Wechselwirkungen} für die {Verwirklichung} von künstlichen photosynthetischen {Modellsystemen} auf {Nano}-{Ebene}},
year = {2020}
}
@article{faucris.242410199,
abstract = {In the scientific race to build up photoactive electron donor-acceptor systems with increasing efficiencies, little is known about the interplay of their building blocks when integrated into supramolecular nanoscale arrays, particularly in aqueous environments. Here, we describe an aqueous donor-acceptor ensemble whose emergence as a nanoscale material renders it remarkably stable and efficient. We have focused on a tetracationic zinc phthalocyanine (ZnPc) featuring pyrenes, which shows an unprecedented mode of aggregation, driven by subtle cooperation between electrostatic and π–π interactions. Our studies demonstrate monocrystalline growth in solution and a symmetry-breaking intermolecular charge transfer between adjacent ZnPcs upon photoexcitation. Immobilizing a negatively charged fullerene (C60) as electron acceptor onto the monocrystalline ZnPc assemblies was found to enhance the overall stability, and to suppress the energy-wasting charge recombination found in the absence of C60. Overall, the resulting artificial photosynthetic model system exhibits a high degree of preorganization, which facilitates efficient charge separation and subsequent charge transport.},
author = {Anaya-Plaza, Eduardo and Joseph, Jan and Bauroth, Stefan and Wagner, Maximilian and Dolle, Christian and Sekita, Michael and Gröhn, Franziska and Spiecker, Erdmann and Clark, Timothy and de la Escosura, Andrés and Guldi, Dirk Michael and Torres, Tomás},
doi = {10.1002/anie.202006014},
faupublication = {yes},
journal = {Angewandte Chemie International Edition},
keywords = {artificial photosynthesis; fullerenes; nanoscale self-assembly; phthalocyanines},
note = {CRIS-Team Scopus Importer:2020-09-11},
peerreviewed = {Yes},
title = {{Synergy} of {Electrostatic} and π–π {Interactions} in the {Realization} of {Nanoscale} {Artificial} {Photosynthetic} {Model} {Systems}},
year = {2020}
}
@article{faucris.240781406,
abstract = {We report on the impact of the central heteroatom on structural, electronic, and spectroscopic properties of a series of spirofluorene-bridged heterotriangulenes and provide a detailed study on their aggregates. The in-depth analysis of their molecular structure by NMR spectroscopy and X-ray crystallography was further complemented by density functional theory calculations. With the aid of extensive photophysical analysis the complex fluorescence spectra were deconvoluted showing contributions from the peripheral fluorenes and the heteroaromatic cores. Beyond the molecular scale, we examined the aggregation behavior of these heterotriangulenes in THF/H2O mixtures and analyzed the aggregates by static and dynamic light scattering. The excited-state interactions within the aggregates were found to be similar to those found in the solid state. A plethora of morphologies and superstructures were observed by scanning electron microscopy of drop-casted dispersions.},
author = {Krug, Marcel and Wagner, Maximilian and Schaub, Tobias A. and Zhang, Wen-Shan and Schüßlbauer, Christoph and Ascherl, Johannes D. R. and Münich, Peter Wilhelm and Schroeder, Rasmus R. and Gröhn, Franziska and Dral, Pavlo O. and Barbatti, Mario and Guldi, Dirk Michael and Kivala, Milan},
doi = {10.1002/anie.202003504},
faupublication = {yes},
journal = {Angewandte Chemie International Edition},
note = {CRIS-Team WoS Importer:2020-07-24},
peerreviewed = {Yes},
title = {{The} {Impact} of {Aggregation} on the {Photophysics} of {Spiro}-{Bridged} {Heterotriangulenes}},
year = {2020}
}
@article{faucris.281421838,
abstract = {A facile synthesis of catalytically tunable core-shell CdS-ZnxMn1-xS-nanoparticles in conjunction with poly(acrylic acid) (PAA) and porphyrin in an aqueous solution is described in the following: The shell composition of the inorganic nanoparticles is varied to tune the optical properties and to optimize the catalytic activity. Further, the tetravalent cationic 5,10,15,20-tetrakis(4-trimethylammoniophenyl) porphyrin (TAPP) fulfills a triple functionality in the catalyst: as a photosensitizer, as an electrostatic linker connecting the nanoparticles and as a probe to investigate the surface composition of the II-VI semiconducting nanoparticles. Different nanoparticles with varying zinc sulfide/manganese sulfide shell ratios are tested with regard to their photocatalytic behavior by crocin bleaching. The results reveal that the shell composition can be a crucial key to optimize the catalytic activity, which can further be important in tuning the reactivity of related systems. Fundamentally, the stepwise multi-component self-assembly in an aqueous solution has been demonstrated to allow the tuning of optic and catalytic properties of core-shell nanoparticles, a general concept that may be widely applicable.},
author = {Wagner, Maximilian and Gröhn, Franziska},
doi = {10.3390/catal12080907},
faupublication = {yes},
journal = {Catalysts},
note = {CRIS-Team WoS Importer:2022-09-09},
peerreviewed = {Yes},
title = {{The} {Shell} {Matters}: {Self}-{Organized} {CdS}-{ZnS}/{MnS}-{Core}-{Shell}-{Porphyrin}-{Polymer} {Nano}-{Assemblies} for {Photocatalysis}},
volume = {12},
year = {2022}
}
@article{faucris.261340436,
abstract = {The photocatalytic activity and selectivity of novel binary and ternary composite nanostructures from polyethylene oxide-stabilized zinc oxide (PEO-ZnO) with and without polyoxometalate (H-4[Si(W3O10)(4)], POM) are determined in aqueous solution under UV-light. Mono- and di-COOH-end-functionalized PEO polymers are used as surface modifiers, influencing the morphology and stability of the ZnO nanoparticles being synthesized in water. POM acts as an additional versatile photocatalytically active building block resulting in a ternary hybrid structure with tunable photocatalytic activity. Catalytic selectivity is demonstrated by studying photocatalytic dye degradations as model reactions, where the chemical backbone of the dyes and their charge turn out to be the basis for the selectivity. All samples are characterized with dynamic light scattering, transmission electron microscopy, scanning electron microscopy, light microscopy, and zeta-potential measurements. With the functionalized PEOs, large ZnO clusters consisting of leaves are formed while 2-[2-(2-methoxyethoxy) ethoxy] acetic acid (TODA) yields ZnO flower-like structures.},
author = {Bernhardt, Sarah and Düring, Jasmin and Haschke, Sandra and Barr, Maissa and Stiegler, Lisa and Schühle, Patrick and Bachmann, Julien and Hirsch, Andreas and Gröhn, Franziska},
doi = {10.1002/admi.202002130},
faupublication = {yes},
journal = {Advanced Materials Interfaces},
note = {CRIS-Team WoS Importer:2021-07-09},
peerreviewed = {Yes},
title = {{Tunable} {Photocatalytic} {Activity} of {PEO}-{Stabilized} {ZnO}-{Polyoxometalate} {Nanostructures} in {Aqueous} {Solution}},
year = {2021}
}