pH-responsive aqueous foams stabilized by ionizable latex particles
pH-responsive aqueous foams stabilized by ionizable latex particles
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DOI：
10.1021/la700444a
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发表时间：
2007-08-14
期刊：
影响因子：
3.9
通讯作者：
Schmid, Andreas
中科院分区：
文献类型：
--
作者：
Binks, Bernard P.;Murakami, Ryo;Schmid, Andreas
我们设计了一种胶体颗粒，其表面特性对其分散的水相的 pH 值敏感。由聚丙烯酸稳定的聚苯乙烯乳胶颗粒可以通过吸附在空气-水表面作为水性泡沫的稳定剂。泡沫只能在低于等电点的 pH 值下制备和稳定，此时颗粒要么不带电并絮凝，要么获得正电荷。在高 pH 值下，颗粒呈阴离子，不会形成泡沫。 pH 对发泡性和稳定性的影响适用于 pH 依赖型和 pH 响应型系统。
We have designed a type of colloidal particle whose surface characteristics are sensitive to the pH of the aqueous phase in which they are dispersed. Particles of polystyrene latex stabilized by poly(acrylic acid) can act as stabilizers of aqueous foams by adsorbing at the air-water surface. Foams can be prepared and stabilized only at pH values below the isoelectric point where particles are either uncharged and flocculated or acquire a positive charge. At high pH where particles are anionic, no foam forms. This influence of pH on foarnability and stability applies to both pH-dependent and pH-responsive systems.