凹凸棒石在Pickering乳液制备中的应用研究进展

Advances in the application of attapulgite in Pickering emulsion preparation

凹凸棒石因具有独特的一维纳米棒状形貌、纳米孔道结构、天然的负电性和良好的水分散性等特点,在Pickering乳液的制备和应用方面受到广泛关注。在介绍凹凸棒石结构特点和理化性质的基础上,综述了凹凸棒石在Pickering乳液制备中的应用研究进展,以期为凹凸棒石及其它黏土矿物稳定Pickering乳液的机理研究及应用拓展提供较全面信息。

Attapulgite,a clay mineral which possesses the unique onedimensional nanorod morphology,nanopore structure,natural electronegativity as well as the good water dispersibility,and has attracted extensive attention in the preparation and application of Pickering emulsion.In a few cases,natural attapulgite can directly stabilize the emulsion with a higher aspect ratio or by introducing olive oil containing a large amount of unsaturated fatty acids.In other cases,the hydrophilic natural attapulgite must be modified with the purpose of adjusting its surface wettability in the preparation of stable Pickering emulsion.According to the action mode of modifier and attapulgite,the modification can be divided into noncovalent bond and covalent bond.Non-covalent bond modification was that the modifier acts on the surface of attapulgite through hydrogen bonding,van der Waals force and electrostatic interaction.According to the molecular size of the modifier,non-covalent bond modification can be divided into organic small molecule and organic polymer.Covalent bond modification was the formation of a covalent bond between the silanol group on the surface of the attapulgite and the modifier through chemical reaction.The emulsion stabilized by attapulgite has a wide range of applications,and can be used to fabricate microcapsules or microspheres with sustained drug release,as a template to fabricate porous materials with adsorption,or catalysis,etc.The structural characteristics and physicochemical properties of attapulgite have been introduced,and then the application research progress of attapulgite in the preparation of Pickering emulsion has been summarized.This review provided the useful information for the mechanism analysis and application extension of attapulgite and other clay mineral stabilized Pickering emulsions.