表面活性剂-纳米颗粒相互作用与智能体系的构建(Ⅱ)相反电荷表面活性剂-纳米颗粒相互作用(i)——开关转移构建开关性Pickering乳状液和Pickering泡沫  

Interactions between surfactants and nanoparticles and the construction of smart systems(Ⅱ) Interaction of the nanoparticle with an oppositely charged ionic surfactant(i) Construction of switchable Pickering emulsions and Pickering foams via switch transf

作　　者：陈钊 蒋建中 崔正刚 CHEN Zhao;JIANG Jian-zhong;CUI Zheng-gang(The Key Laboratory of Synthetic and Biological Colloids,Ministry of Education,School of Chemical&Material Engineering,Jiangnan University,Wuxi,Jiangsu 214122,China)

机构地区：[1]江南大学化工与材料工程学院合成与生物胶体教育部重点实验室

出　　处：《日用化学工业》2019年第8期492-502,共11页China Surfactant Detergent & Cosmetics

基　　金：国家自然科学基金资助项目(20901032,21473080,21573096,20872064)

摘　　要：表面能够部分被水润湿、部分被油润湿的胶体颗粒具有表面活性,能够吸附到油(空气)/水界面稳定Pickering乳状液和Pickering泡沫。大多数无机纳米颗粒在水介质中表面是带电的,由于过于亲水而不具有表面活性或者表面活性偏低。一种简单的方法是在无机纳米颗粒的分散液中加入微量的带相反电荷的离子型表面活性剂,它们会通过静电作用吸附到颗粒表面,形成疏水性单分子层,从而提高颗粒表面的亲油性,赋予颗粒表面活性。这种作用被称为原位疏水化作用(hydrophobization in situ)。本讲座将讨论如何利用原位疏水化作用赋予无机纳米颗粒表面活性,以及如何借助于开关性表面活性剂与纳米颗粒的相互作用,将表面活性剂的开关转移给颗粒,进而构建开关性Pickering乳状液和Pickering泡沫。Colloidal particles with surfaces partially wetted by water and oil are surface active,which can adsorb at oil(air)/water interface to stabilize Pickering emulsions and Pickering foams.Most of inorganic nanoparticles are charged in aqueous media which are not or less surface active due to the strong hydrophilicity.A simple method to make them surface active is to add trace amount of oppositely charged ionic surfactant into the aqueous dispersions of the particles,which will adsorb at particle/water interface via electrostatic interaction to form a hydrophobic monolayer at particle surface,so that the hydrophobicity of the particles is significantly increased.This interaction is called hydrophobization in situ.In this lecture we will discuss how to make inorganic nanoparticles surface active via hydrophobization in situ and how to transfer the switch of a surfactant to particles by particle/surfactant interaction to construct switchable Pickering emulsions and switchable Pickering foams.

关 键 词：原位疏水化 表面活性颗粒 Pickering乳状液 Pickering泡沫 开关转移 

分 类 号：TQ423[化学工程]