Induction of Amphiphilicity in Polymer@Silica Particles: Ceramic Surfactants

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• 作者：Ido Fuchs ; David Avnir
• 刊名：Langmuir
• 出版年：2013
• 出版时间：March 5, 2013
• 年：2013
• 卷：29
• 期：9
• 页码：2835-2842
• 全文大小：407K
• 年卷期：v.29,no.9(March 5, 2013)
• ISSN：1520-5827

文摘

It is shown that, in general, when submicrometer hybrid particles of polymer@silica are subjected to thermal treatment, phase-separated hydrophobicity emerges at particles surface; and that the triggering of hydrophobicity results in particles which show amphiphilic behavior, arranging themselves at water interfaces and stabilizing W/O and O/W emulsions. Many polymer@silica particles show this behavior, and the entrapped polymers include polyethylene Engage, poly(dimethylsiloxane), poly-l-lactic acid, poly(ethylene-block-ethyleneglycol), poly(styrene-co-allyl-achohol), and poly(dimethylesiloxane-block-ethyleneoxide-co-propyleneoxide). The concept is attractive because, by doping the particles with functional molecules, one can get various surfactants from the same treated particle; this is demonstrated with fluorescent probes. It is proposed that the amphiphilic activity is due to Janus heterogeneous distribution of the hydrophobic moieties on the surface.