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Fabrication of mesoporous silica/carbon black
nanospheres and load-sensitive conducting rubber nanocomposites |
| En-Rong LI,Qian-Jun ZHANG,Wei WANG,Qing-Wen ZHU,Long BA, |
| State Key Laboratory
of Bioelectronics, School of Biomedical Engineering and Department
of Physics, Southeast University, Nanjing 210096, China; |
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Abstract Mesoporous silica nanospheres (MSNs) with regular pores have been fabricated using cetyltrimethylammonium bromide (CTAB) as surfactant in high pH solution. The average size of the MCM-41 silica nanospheres was reduced from 95 to 48€nm, while the concentration of CTAB increases from 7.7 to 11.5mmol/L. Carbon black was deposited on MSNs using hexane as the carbon source. By mixing such materials with silicone rubber, the composites become conducting when equivalent carbon volume fraction is higher than a certain region, which is less sensitive to the morphology of the deposited carbon. The improved piezoresistance repeatability has been found on the composite sample of MSNs/carbon plus extra high conducting carbon black. The load and strain sensitive range up to 0.35MPa and 0.10, respectively, with less resistance fluctuation during multiple press loading cycles.
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| Keywords
nanomaterials
mesoporous silica
conducting rubber
piezoresistance
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Issue Date: 05 March 2010
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