Correlation of Enhanced Strength and Internal Structure for Heat-Treated Submicron Stöber Silica Particles

Journal article


Publication Details

Author(s): Romeis S, Paul J, Hanisch M, Marthala V, Hartmann M, Klupp Taylor R, Schmidt J, Peukert W
Journal: Particle and Particle Systems Characterization
Publication year: 2014
Volume: 31
Journal issue: 6
Pages range: 664--674
ISSN: 1521-4117
Language: English


Abstract


The Stöber–Fink–Bohn (SFB) method allows the synthesis of spherical silica particles over a wide size range. Owing to the complex formation mechanism, the internal structure and related mechanical properties are not well understood. Within this account, the internal structure of synthesized SFB particles is changed systematically by heat treatments. Characterization by colloid titration, infrared spectroscopy, and solid-state nuclear magnetic resonance spectroscopy and the assessment of mechanical properties for single particles by in situ micromanipulation shed light on structure–property relations. Over the course of heat treatment, SFB particles become denser and owing to condensation of internal hydroxyl groups, the cross-linking of the silica network is enhanced. The observed chemical and structural changes are reflected by the mechanical properties of the particles: starting from a low Young’s modulus and hardness, clearly below the bulk properties of fused silica, both values are increasing over the course of the thermal treatment. Hardness for fused silica is approached after a treatment at 800 °C and exceeded after a treatment at 1000 °C. Young’s modulus approaches the bulk value. Furthermore, a significant plasticity is found: the sustained deformations are extremely high, and thus silica spheres with enhanced strength have been obtained by the thermal treatment.



FAU Authors / FAU Editors

Hanisch, Mathias
Professur für Nanostructured Particles
Hartmann, Martin Prof. Dr.
Professur für Katalyse
Klupp Taylor, Robin Prof.
Professur für Nanostructured Particles
Marthala, Venkata Dr.
Professur für Katalyse
Paul, Jonas
Lehrstuhl für Feststoff- und Grenzflächenverfahrenstechnik
Peukert, Wolfgang Prof. Dr.-Ing.
Lehrstuhl für Feststoff- und Grenzflächenverfahrenstechnik
Romeis, Stefan Dr.-Ing.
Lehrstuhl für Feststoff- und Grenzflächenverfahrenstechnik
Schmidt, Jochen Dr.
Lehrstuhl für Feststoff- und Grenzflächenverfahrenstechnik


Additional Organisation
Graduiertenkolleg 1896/2 In situ Mikroskopie mit Elektronen, Röntgenstrahlen und Rastersonden
Exzellenz-Cluster Engineering of Advanced Materials


How to cite

APA:
Romeis, S., Paul, J., Hanisch, M., Marthala, V., Hartmann, M., Klupp Taylor, R.,... Peukert, W. (2014). Correlation of Enhanced Strength and Internal Structure for Heat-Treated Submicron Stöber Silica Particles. Particle and Particle Systems Characterization, 31(6), 664--674. https://dx.doi.org/10.1002/ppsc.201300306

MLA:
Romeis, Stefan, et al. "Correlation of Enhanced Strength and Internal Structure for Heat-Treated Submicron Stöber Silica Particles." Particle and Particle Systems Characterization 31.6 (2014): 664--674.

BibTeX: 

Last updated on 2018-08-08 at 01:29