TY - JOUR
T1 - Influence of alkylene-bridging group length on mesostructure and porosity in cubic (Pm3n) periodic mesoporous bridged polysilsesquioxanes
AU - Lin, Derong
AU - Hu, Lijiang
AU - Li, Zhe
AU - Loy, Douglas A.
N1 - Funding Information:
Acknowledgments This experiment fund is based upon work supported by the State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, China (Grant NO. QA200901), and the China Scholarship Council. Financial supports are acknowledged from The Aerospace Supported Fund (GN: 2012-HT-HGD-11) and from The Invitation of Foreign Experts Program of The Chinese Foreign Experts Bureau (GN: GDW20122300078), China. Thanks to Phil Anderson at the University of Arizona Research Laboratories for the transmission electron microscopy and Dr. Zhe Li at the Department of Chemistry at the University of Arizona for assistance with the scanning electron microscopy. We would also like to thank Dr. Lv Kai at the Department of Chemistry at the University of Massachusetts for the SXRD experiments.
PY - 2014/2
Y1 - 2014/2
N2 - A family of three-dimensional cubic (Pm3n) periodic mesoporous silsequioxanes (PMS) with alkylene bridging groups was prepared by surfactant templating. PMS materials with methylene-, ethylene-, hexylene-, and octylene-bridging groups were synthesized from bis(triethoxysilyl)methane, 1, 2-bis(triethoxysilyl)ethane, 1, 6-bis(triethoxysilyl)hexane and 1, 8-bis(triethoxysilyl)octane, respectively, in the presence of the surfactant, Brij 56, under acidic conditions. Highly ordered, cubic (Pm3n) mesostructures in all of the alkylene-bridged PMS samples were confirmed by small angle X-ray diffraction and transmission electron microscopy. The PMS materials were very porous with surface areas over 800 m2g-1 and narrow distributions of pores between 2 and 4 nm in diameter. Length of the bridging groups appeared to have little effect on the structure and porosity of the PMS materials, but the contact angle increased dramatically with increasing bridging group length. The high surface area, isotropic pore structure and variable hydrocarbon content should make the alkylene bridged PMS materials promising candidates for organic pollutant adsorbents from water or air.
AB - A family of three-dimensional cubic (Pm3n) periodic mesoporous silsequioxanes (PMS) with alkylene bridging groups was prepared by surfactant templating. PMS materials with methylene-, ethylene-, hexylene-, and octylene-bridging groups were synthesized from bis(triethoxysilyl)methane, 1, 2-bis(triethoxysilyl)ethane, 1, 6-bis(triethoxysilyl)hexane and 1, 8-bis(triethoxysilyl)octane, respectively, in the presence of the surfactant, Brij 56, under acidic conditions. Highly ordered, cubic (Pm3n) mesostructures in all of the alkylene-bridged PMS samples were confirmed by small angle X-ray diffraction and transmission electron microscopy. The PMS materials were very porous with surface areas over 800 m2g-1 and narrow distributions of pores between 2 and 4 nm in diameter. Length of the bridging groups appeared to have little effect on the structure and porosity of the PMS materials, but the contact angle increased dramatically with increasing bridging group length. The high surface area, isotropic pore structure and variable hydrocarbon content should make the alkylene bridged PMS materials promising candidates for organic pollutant adsorbents from water or air.
KW - Contact angle
KW - Cubic
KW - Ethylene-bridged polysilsesquioxane
KW - Hexylene-bridged
KW - Methylene-bridged
KW - Octylene-bridged
KW - Periodic mesoporous materials
KW - Pm3n
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U2 - 10.1007/s10934-013-9744-9
DO - 10.1007/s10934-013-9744-9
M3 - Article
AN - SCOPUS:84894907260
SN - 1380-2224
VL - 21
SP - 39
EP - 44
JO - Journal of Porous Materials
JF - Journal of Porous Materials
IS - 1
ER -