Please use this identifier to cite or link to this item:
Title: Synthesis and characterization of large-pore periodic mesoporouis organosilicas
Keywords: Bridged silsesquinoxane; Morphology; Periodic mesoporous organosilicas;Porous properties; Sol-gel; Self-assembly
Issue Date: 4-Apr-2005
Citation: BAO XIAO YING (2005-04-04). Synthesis and characterization of large-pore periodic mesoporouis organosilicas. ScholarBank@NUS Repository.
Abstract: In this work, the synthesis of high-quality methylene-, ethylene-, and ethenylenebridgedSBA-15 type periodic mesoporous organosilicas with superior electronirradiation resistance was investigated. By employing the characterization techniquesof SAXS, FE-SEM, TEM and N2 sorption analysis, the porous properties and externalmorphologies of ethylene-bridged SBA-15 PMOs prepared under a variety ofsynthetic conditions were characterized and compared with that of mesoporous silicassynthesized under similar conditions. A nucleation-accretion mechanism based onrodlike organosilicate-micelle building blocks was proposed to explain the formationof various morphologies. The inductive, bridging and steric effects of the organicspacers of bridged silsesquinoxanes on the formation of large-pore PMOs wereidentified. In addition, by simply adjusting the HCl/H2O molar ratios, the micro-,meso-, and macro-porosities of the ethylene-bridged SBA-15 PMOs can be finelytuned without an obvious effect on their structural order.
Appears in Collections:Master's Theses (Open)

Show full item record
Files in This Item:
File Description SizeFormatAccess SettingsVersion 
Thesis (Bao Xiao Ying HT026822M).pdf22.36 MBAdobe PDF



Page view(s)

checked on Oct 29, 2019


checked on Oct 29, 2019

Google ScholarTM


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.