Direct Observation of Plugs and Intrawall Pores in SBA-15 Using Low Voltage High Resolution Scanning Electron Microscopy and the Influence of Solvent Properties on Plug-Formation
2013 (English)In: Chemistry of Materials, ISSN 0897-4756, E-ISSN 1520-5002, Vol. 25, no 20, 4105-4112 p.Article in journal (Refereed) Published
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.
Place, publisher, year, edition, pages
2013. Vol. 25, no 20, 4105-4112 p.
SBA-15, plugs, LV-HRSEM, intrawall pores, pore structure, in situ SAXS, N-2-sorption
IdentifiersURN: urn:nbn:se:su:diva-96886DOI: 10.1021/cm402635mISI: 000326209200021OAI: oai:DiVA.org:su-96886DiVA: diva2:667891
FunderSwedish Research Council
Swedish Foundation for Strategic Research; Swedish Research Council through the Linnaeus grant "Organizing Molecular Matter"; Kungliga Fysiografiska Sällskapet; Swedish Research Council 2013-11-282013-11-282013-11-28Bibliographically approved