X-ray Scattering Study Of Capillary Condensation In Mesoporous Silica

The capillary condensation deforms a nanoporous material due to the capillary force generated by the fluid inside the pores. In-situ small and wide angle x-ray scattering(S/WAXS) were used to study the deformation with respect to relative vapor pressure of the fluid. Periodic mesoporous silica such as MCM-41 and SBA-15 were synthesized and used as the samples with water as the capillary condensation agent.The gas sorption method and SAXS were used to extract the pore parameters of the samples.The stresses acting on the silica scaffold due to the presence of water in the pores were deduced by careful analysis of various forces acting on it. The Poisson's ratio and elastic moduli of the two samples and their annealed forms were estimated and compared quantitatively. Our study demonstrates a novel WAXS-based technique for calculating the mechanical properties of nanoporous materials with much wider applicability than the previously reported SAXS technique.

Name thesis:degree_name

Master of Science (MS)

Level thesis:degree_level

masters

Discipline thesis:degree_discipline

Physics and Astronomy (Arts and Sciences)

Grantor dc:publisher

Ohio University

Year dc:date

2013

Author dc:creator

• Sundararajan, Mayur

Contributors dc:contributor

• Chen, Gang

• Physics
• WAXS
• mesoporous silica
• MCM-41
• SBA-15
• Mechanical properties
• Poisson's ratio
• Capillary condensation

Statement dc:rights

• unrestricted
• This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.

Language dc:language

English

Repository record dc:identifier

http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1355943408

OAI identifier oai:identifier

oai:etd.ohiolink.edu:ohiou1355943408