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Zeitschrift für Physikalische Chemie

International journal of research in physical chemistry and chemical physics

Editor-in-Chief: Rademann, Klaus


IMPACT FACTOR 2017: 1.144
5-year IMPACT FACTOR: 1.144

CiteScore 2018: 1.20

SCImago Journal Rank (SJR) 2018: 0.327
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2196-7156
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Volume 229, Issue 7-8

Issues

Relationship Between Pore Structure and Sorption-Induced Deformation in Hierarchical Silica-Based Monoliths

Christian Balzer / Roland Morak / Maxim Erko
  • Institute of Physics, Montanuniversitaet Leoben, Austria
  • present affiliation: Department of Biomaterials, MaxPlanck Institute of Colloids and Interfaces, Potsdam, Germany
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Christos Triantafillidis / Nicola Hüsing / Gudrun Reichenauer / Oskar Paris
Published Online: 2015-01-09 | DOI: https://doi.org/10.1515/zpch-2014-0542

Abstract

Experimental results on sorption-induced deformation during n-pentane desorption were obtained by in-situ dilatometry and in-situ small angle X-ray scattering (SAXS). The sample investigated was a silica-based monolith with hierarchical pore structure comprising a macroporous network of struts, each strut containing well-defined cylindrical mesopores ordered on a 2D hexagonal lattice. In-situ dilatometry and in-situ SAXS measurements revealed strain isotherms of similar shape, which are qualitatively in good agreement with recent theoretical predictions. From the relative pressure range of the liquid filled mesopores a pore load modulus of 1.5 GPa is determined. The relative pressure region of mono- and multilayer formation, however, reveals differences between the two independent methods. In particular, the net strain at saturation pressure is considerably larger for in-situ dilatometry. We attribute this observation to the different sensitivity of the two methods to anisotropic deformation in the hierarchical solid framework. While in-situ SAXS measures the mesopore lattice strain and is therefore exclusively sensitive to radial deformation of the struts, dilatometry measures the linear deformation of the isotropic macroscopic sample, being sensitive to the volumetric strain of the whole network.

Keywords: Mesopores; Sorption Deformation; In-Situ Dilatometry; SAXS; Silica

Acknowledgement

We thank Lena Weigold (Bavarian Center for Applied Energy Research) for performing the He-Pycnometry measurements and both, Micromeritics and the Institute of Chemical Process Engineering of the Karlsruhe Institute of Technology (KIT), for providing the AccuPyc II 1340 instrument. We acknowledge financial support from the Austrian Science Foundation FWF (Project I 1605-N20) and the German Science Foundation DFG (Project GZ:RE1148/10-1).

About the article

Accepted: 2014-11-14

Received: 2014-05-28

Published Online: 2015-01-09

Published in Print: 2015-08-28


Citation Information: Zeitschrift für Physikalische Chemie, Volume 229, Issue 7-8, Pages 1189–1209, ISSN (Online) 2196-7156, ISSN (Print) 0942-9352, DOI: https://doi.org/10.1515/zpch-2014-0542.

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©2015 Oskar Paris, published by De Gruyter.. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. BY-NC-ND 3.0

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