Journal
CHEMISTRY OF MATERIALS
Volume 25, Issue 20, Pages 4105-4112Publisher
AMER CHEMICAL SOC
DOI: 10.1021/cm402635m
Keywords
SBA-15; plugs; LV-HRSEM; intrawall pores; pore structure; in situ SAXS; N-2-sorption
Funding
- Swedish Foundation for Strategic Research
- Swedish Research Council through the Linnaeus grant Organizing Molecular Matter
- Kungliga Fysiografiska Sallskapet
- Swedish Research Council
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Through the use of low voltage high resolution scanning electron microscopy (LV-HRSEM) we have studied the fine details of the intricate pore structure of SBA-15. Intrawall pores and deviations from the ideal and uniform cylindrical pores are clearly observed, and we report for the first time the direct observation of plugs in the pores. N-2-sorption measurements confirm their existence. LV-HRSEM provides an opportunity to quantify the frequency of occurrence of plugs within the pore structure. The rate of mesophase formation, followed with in situ small angle X-ray scattering (SAXS) under different solvent conditions, is shown to have a significant influence on the development of plugs and how frequently they occur. We suggest a mechanism explaining the existence of the plugs, providing means for a better understanding and control over material properties.
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