凹凸棒颗粒稳定的Pickering乳状液的制备条件及形成机理研究  

Study on the Preparation Conditions of Olive Oil in Water Pickering Emulsions Stabilized by Attapulgite Particles and Formation Mechanism

作　　者：陈浩[1] 张晓优 徐樟浩[1] 赵杰[1] 

机构地区：[1]台州学院医药化工学院,浙江临海317000 [2]临海市中等职业技术学校,浙江临海317000

出　　处：《非金属矿》2013年第3期13-17,42,共6页Non-Metallic Mines

基　　金：国家自然科学基金(20903070)

摘　　要：选取凹凸棒作为乳化剂，系统研究pH值、颗粒质量分数、油相体积分数以及不同价态盐对橄榄油／水型Pickering乳状液稳定性的影响。结果表明，体系pH值在4～9范围内可制备出稳定的乳状液；颗粒质量分数提高可增强乳液的分层和聚结稳定性；乳液液滴直径随油相体积分数的增加先增大后减小；无机盐的引入不会对乳液相及水相体积产生影响，但对乳液液滴的尺寸分布影响显著，其中Nacl浓度的增加有利于乳状液液滴数均直径的增加，而CaCl2浓度增加时，乳状液液滴数均直径呈现先增大后减小的变化趋势。显微镜图片显示，凹凸棒颗粒主要以聚集体网状结构的方式附着在油一水界面处，从而起到稳定乳液液滴的效果。In this work, attapulgite was selected as emulsifier and the effects of pH value, particle concentration, volume fraction of oil phase and salts of different valences on stability of olive oil-in-water Pickering emulsion were systematically investigated. The results show that the pH value in the range of 4-9 favours the formation of stable emulsions. The increase in concentration of particles can enhance coalescerlce stability of emulsion. With the increasing volume fraction of oil phase, diameter of the emulsion droplets increases firstly and then decreases. Introduction of the inorganic salt into system doesn＇t impact the volumes of the emulsion phase and water phase, but the size distribution of the emulsion droplets are significantly affected. Herein, the increase of NaC1 concentration is conducive to the increase in average diameter of emulsion droplets. While CaC12 concentration increases, average diameter of emulsion droplets increases first and then decreases. Microscope image shows attapulgite particles are mainly attached in the oil-water interface through network structure of aggregates, which plays a role in stabilizing emulsion droplets.

关 键 词：Pickering乳液 凹凸棒颗粒 制备条件 稳定机理 

分 类 号：TD985[矿业工程—选矿]