Interface between Water-Solvent Mixtures and a Hydrophobic Surface

Prihoda A, Will J, Duchstein P, Becit B, Lossin F, Schindler T, Berlinghof M, Steinrück HG, Bertram F, Zahn D, Unruh T (2020)

Publication Type: Journal article

Publication year: 2020

Journal

Langmuir American Chemical Society

Book Volume: 36

Pages Range: 12077-12086

Journal Issue: 40

DOI: 10.1021/acs.langmuir.0c02745

Abstract

The mechanism behind the stability of organic nanoparticles prepared by liquid antisolvent (LAS) precipitation without a specific stabilizing agent is poorly understood. In this work, we propose that the organic solvent used in the LAS process rapidly forms a molecular stabilizing layer at the interface of the nanoparticles with the aqueous dispersion medium. To confirm this hypothesis, n-octadecyltrichlorosilane (OTS)-functionalized silicon wafers in contact with water-solvent mixtures were used as a flat model system mimicking the solid-liquid interface of the organic nanoparticles. We studied the equilibrium structure of the interface by X-ray reflectometry (XRR) for water-solvent mixtures (methanol, ethanol, 1-propanol, 2-propanol, acetone, and tetrahydrofuran). The formation of an organic solvent-rich layer at the solid-liquid interface was observed. The layer thickness increases with the organic solvent concentration and correlates with the polar and hydrogen bond fraction of Hansen solubility parameters. We developed a self-consistent adsorption model via complementing adsorption isotherms obtained from XRR data with molecular dynamics simulations.

Authors with CRIS profile

Annemarie Prihoda Professur für Nanomaterialcharakterisierung (Streumethoden) Johannes Will Lehrstuhl für Werkstoffwissenschaften (Mikro- und Nanostrukturforschung) Patrick Duchstein Computer-Chemie-Centrum (CCC) Bahanur Becit Lehrstuhl für Theoretische Chemie Felix Lossin Lehrstuhl für Kristallographie und Strukturphysik (ICSP) Torben Schindler Lehrstuhl für Kristallographie und Strukturphysik (ICSP) Marvin Berlinghof Lehrstuhl für Kristallographie und Strukturphysik (ICSP) Dirk Zahn Professur für Theoretische Chemie Tobias Unruh Professur für Nanomaterialcharakterisierung (Streumethoden)

Additional Organisation(s)

Interdisziplinäres Zentrum, Center for Nanoanalysis and Electron Microscopy (CENEM) Lehrstuhl für Werkstoffwissenschaften (Mikro- und Nanostrukturforschung) Graduiertenkolleg 1896/2 In situ Mikroskopie mit Elektronen, Röntgenstrahlen und Rastersonden

Related research project(s)

In-situ Characterization of Nanomaterials with Electrons, X-rays/Neutrons and Scanning Probes (GRK 1896) Oct. 1, 2013 - Sept. 30, 2022

Involved external institutions

Universität Paderborn DE Germany (DE) Deutsches Elektronen-Synchrotron DESY DE Germany (DE)

How to cite

APA:

Prihoda, A., Will, J., Duchstein, P., Becit, B., Lossin, F., Schindler, T.,... Unruh, T. (2020). Interface between Water-Solvent Mixtures and a Hydrophobic Surface. Langmuir, 36(40), 12077-12086. https://doi.org/10.1021/acs.langmuir.0c02745

MLA:

Prihoda, Annemarie, et al. "Interface between Water-Solvent Mixtures and a Hydrophobic Surface." Langmuir 36.40 (2020): 12077-12086.

BibTeX: Download