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79. Synthesis and evaluation of hexafluoroisopropanol-functionalized polysiloxane as a new coating material for sensors.

Author

Wei, Dongwei, Wang, Lishuo, Ma, Jinyi, and Jiang, Hongmin

Subjects
SILOXANES, POLYMERS, SURFACE coatings, ACOUSTIC surface wave devices, PERMEABILITY, GLASS transition temperature
Abstract

A new polysiloxane polymer as a coating material for surface acoustic wave (SAW) sensors was synthesized. The polymer was a linear polysiloxane functionalized with hexafluoroisopropanol (HFIP) groups, poly{methyl [4-(hexafluoroisopropanol) phenylethyl] siloxane}. The polymer was spin-coated on a 200-MHz SAW sensor for the detection of a 2,4-dinitrotoluene vapor. A fast response time of 30 s and good reproducibility were achieved. It was found that the frequency shift decreased as the polymer concentrations decreased. The new polysiloxane coatings showed excellent properties, such as a high sensitivity, high permeability, and low glass-transition temperature (−40.5 ± 1°C). © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012 [ABSTRACT FROM AUTHOR]

Published
2012
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81. [Chitosan and its applications in synthesis of metal nanomaterials].

Author

Wei D, Jia C, Jia X, Ye Y, and Qian W

Subjects
Catalysis, Oxidation-Reduction, Chitosan chemistry, Metal Nanoparticles chemistry
Abstract

Chitosan has natural abundance, unique bioactivity and attractive physicochemical properties. Recent years, the synthesis of chitosan-based metal nanomaterials has attracted increasing attention. The synthesis of metal nanoparticles utilizing biomolecular or organism offers a mild medium, and thus a greater degree of control over the nanoparticles produced, along with higher reproducibility. In particular, preparation of metal nanoparticles based on biomolecular or organism has its unique facility in integrating "minimum feature sizes" into labile biological components to an excellent synergy and bifunctional effect and consequently a more broad application. Herein, we review the new development of chitosan, chitosan-based synthesis of metal nanomaterials, and their application.

Published
2009

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