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標題Title: pickering emulsions stabilized by paraffin wax and Laponite clay particles
作者Authors: 江沛倉
上傳單位Department: 化學工程與材料工程系
上傳時間Date: 2010-6-28
上傳者Author: 江沛倉
審核單位Department: 化學工程與材料工程系
審核老師Teacher: 吳文海
檔案類型Categories: 課堂報告In-class Report
關鍵詞Keyword: Pickering emulsions,Particles,Laponite,Paraffin wax,Stability
摘要Abstract: Emulsions containing wax in dispersed droplets stabilized by disc-like Laponite clay particles are prepared.Properties of the emulsions prepared at different temperatures are examined using stability,microscopy and droplet-size analysis. At low temperature, the wax crystals in the oil droplets can protrudethrough the interface, leading to droplet coalescence. But at higher temperatures, the droplet sizedecreases with wax concentration. Considering the viscosity of the oil phase and the interfacial tension,we conclude that the wax is liquid-like during the high temperature emulsification process, but during cooling wax crystals appear around the oil/water interface and stabilize the droplets. The oil/water ratio has minimal effect on the emulsions between ratios of 3:7 and 7:3. The Laponite is believed to stabilize the emulsions by increasing the viscosity of the continuous phase and also by adsorbing at the oil/water
interface, thus providing a physical barrier to coalescence.

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2010_6_3acf537a.ppt 1328Kb ppt 375 46
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