Poly(vinyl amine)鈥揝ilica Composite Nanoparticles: Models of the Silicic Acid Cytoplasmic Pool and as a Silica Precursor for Composite Materials Formation

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• 作者：Vadim V. Annenkov ; Elena N. Danilovtseva ; Victor A. Pal鈥檚hin ; Vladimir O. Aseyev ; Alexander K. Petrov ; Alexander S. Kozlov ; Siddharth V. Patwardhan ; Carole C. Perry
• 刊名：Biomacromolecules
• 出版年：2011
• 出版时间：May 9, 2011
• 年：2011
• 卷：12
• 期：5
• 页码：1772-1780
• 全文大小：1117K
• 年卷期：v.12,no.5(May 9, 2011)
• ISSN：1526-4602

文摘

The role of polymer (poly(vinylamine)) size (238鈥?1000 units) on silicic acid condensation to yield soluble nanoparticles or composite precipitates has been explored by a combination of light scattering (static and dynamic), laser ablation combined with aerosol spectrometry, IR spectroscopy, and electron microscopy. Soluble nanoparticles or composite precipitates are formed according to the degree of polymerization of the organic polymer and pH. Nanoparticles prepared in the presence of the highest molecular weight polymers have core鈥搒hell like structures with dense silica cores. Composite particles formed in the presence of polymers with extent of polymerization below 1000 consist of associates of several polymer鈥搒ilica nanoparticles. The mechanism of stabilization of the 鈥渟oluble鈥?silica particles in the tens of nanometer size range involves cooperative interactions with the polymer chains which varies according to chain length and pH. An example of the use of such polymer鈥損oly(silicic acid) nanoparticles in the generation of composite polymeric materials is presented. The results obtained have relevance to the biomimetic design of new composite materials based on silica and polymers and to increasing our understanding of how silica may be manipulated (stored) in the biological environment prior to the formation of stable mineralized structures. We suspect that a similar method of storing silicic acid in an active state is used in silicifying organisms, at least in diatom algae.