|Table of Contents|

The Influence of Mechanical Grinding on the Structure of Mesoporous Silica SBA-15(PDF)

《南京师大学报（自然科学版）》[ISSN:1001-4616/CN:32-1239/N]

Issue:
2008年03期
Page:
71-75
Research Field:
化学
Publishing date:

Info

Title:
The Influence of Mechanical Grinding on the Structure of Mesoporous Silica SBA-15
Author(s):
Lü Luping; Ding Dandan; Yang Chun
School of Chemistry and Environmental Science,Nanjing Normal University,Nanjing 210097,China
Keywords:
m esoporous m ate rials;  SBA-15;  gr ind ing;  mechan ica l property
PACS:
O643.36
DOI:
-
Abstract:
E ffects o f g rinding on the struc ture o f m esoporous silica SBA-15 syn thesized w ith different temp la te-rem oval m ethods w ere investigated. The samp les w ere characterized byN2 adsorption-desorption, X-ray diffraction ( XRD) , fou rier-transform in frared spectro scopy ( FT-IR), and so lid-sta ted 29 S iCP MAS NMR. It w as found that the g rinding par tia lly destroyed the struc ture of m esoporous silica SBA-15, resu lting in a decrease in long-range order, as we ll as lowe r surface a rea, sm a ller po re vo lum e and d im in ishing pore diam ete r. M eanwh ile, the g rind ing increased the structu re defects in porew a l;l and them echanical pressure a lso caused the shrinkage o f the unit ce ll and the decrease in m icropore vo lum e. For the SBA-15 synthesized using d iffe rent temp la te-rem oval m ethods, the m echan ica l property of the calc ined sam ple is super ior to that of ethanol-extrac ted sam ple; a sm a ller in fluence on the form er w as obse rved upon gr ind ing. Th is is because the ca lcina tion is favorab le to the condensation and com paction o f silica w alls

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Last Update: 2013-05-05