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首页> 外文期刊>Journal of Microencapsulation: Microcapsules Liposomes Nanoparticles Microcells Microspheres >The relation between narrow-dispersed microcapsules and surfactants
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The relation between narrow-dispersed microcapsules and surfactants

机译：窄分散微胶囊与表面活性剂的关系

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Electric ink display is one of the prospect technologies in paper-like display.In this paper,electric ink microcapsules are prepared by means of an in situ polymerization and complex coacervation.In order to obtain the microcapsules in a uniform size distribution,this study focused on the inter-facial tension between tetrachloroethylene and water solution,the dispersion of the core droplets and the micro-encapsulation with different kind of surfactants.By measuring the inter-facial tensions between water and tetrachloroethylene,it is found that urea-formaldehyde(UF)pre-polymer presents certain surface activity due to the inter-facial tension descending from 43mNm~(-1)to 35m N m~(-1).Because the surface activity of pre-polymer is not valid,the water-soluble emulsifiers can occupy on the surface of the droplets and prevent the UF resin depositing there.The analysis of the size distribution shows that the UF microcapsules are multi-dispersed.Furthermore,the influence of anionic surfactant of SDS on the size distribution of the core droplets is also investigated.The average diameters of the core droplets prepared with 0.005 wt% and 0.012wt% SDS are approx50 mum and 28 mum,respectively.That reveals the existence of SDS not only decreases the droplet diameters,but also makes the size distribution centralized.Because the surface of the core droplets is charged due to the absorption of SDS anionic,the Gelatin and Gum Arabic(GA)coacervating layer is easy to form there.The size of the GA microcapsules prepared with 0.003 wt% SDS is approx65 um.Finally;the responsive behaviour of the microcapsules to electric field is also investigated.
机译：电子墨水显示器是纸样显示器中的一种前景技术。本文通过原位聚合和复杂凝聚制备电子墨水微胶囊。为了获得尺寸均匀的微胶囊，本研究重点是在四氯乙烯与水溶液的界面张力，核滴的分散和不同类型表面活性剂的微囊化方面。通过测量水与四氯乙烯之间的界面张力，发现脲醛（UF） ）由于界面张力从43mNm〜（-1）下降到35m N m〜（-1），预聚物具有一定的表面活性。由于预聚物的表面活性无效，因此水溶性乳化剂粒径分布的分析表明，超滤微胶囊是多分散的。此外，阴离子表面活性剂的影响还研究了SDS对核滴尺寸分布的影响。用0.005 wt％和0.012 wt％SDS制备的核滴的平均直径分别约为50μm和28μm。这表明SDS的存在不仅降低了液滴的直径，但也使粒径分布集中。由于核心液滴的表面由于SDS阴离子的吸收而带电，因此明胶和Gum阿拉伯胶（GA）凝聚层很容易在那里形成。GA微胶囊的大小用0.003 wt％的SDS制备约65 um。最后;还研究了微胶囊对电场的响应行为。

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