Stabilization of Surfactant-Free Emulsion and its Application for Novel Reaction Field

无表面活性剂乳液的稳定及其在新型反应领域的应用

• 批准号: 12640565
• 负责人: ABE Masahiko
• 金额: $ 0.96万
• 依托单位: Tokyo University of Science
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-12640565/
• 关键词: Emulsion; Oid Droplet; Alkane; Interfacial tension; Zeta Potential; Dispersion Stability; Activated Oxygen; Ultrasonication; アルキルベンゼン; アルキルエーテル; ポリスチレン; 油滴; サーファクタントフリーエマルション; ヘキサデカン; ベンゼン; オレイン酸エステル; 疎水性高分子

Growth processes of hydrocarbon droplets (06-016: n-hexane, cyclohexane, n-octane, n-decane, n-dodecane, n-tetradecane, and n-hexadecane) in oil/water emulsions under surf actant-free conditions were examined by dynamic light scattering (DLS) and freeze-fracture electron microscopy (FFEM). DLS results showed that the growth rate of droplet size decreased with, increase in hydrocarbon chain length. For example, n-hexane droplets grew within 1 h from submicrometer to micrometer droplets, while n-hexadecane droplets with sizes of several tens of nanometers kept their dispersibility for 24 h. The growth processes were determined as coalescence and molecular diffusion (Ostwald ripening) in terms of the Lifshitz-Slyozov-Wagner theory and the Smoluchowski equation. Furthermore, FFEM was used to examine the growth mechanism in detail. Direct imaging of n-hexane and cyclohexane droplets by FFEM allowed us to observe very fine oil droplets (ca.10 nm in diameter) though DLS could not detect these droplets, suggesting that fine droplets of shorter hydrocarbons such as n-hexane and cyclohexane grow via both molecular diffusion and coalescence processes in a very short time after preparation.

采用动态光散射（DLS）和冷冻断裂电镜（FFEM）研究了无表面活性剂条件下正己烷、环己烷、正辛烷、正癸烷、正十二烷、正十四烷和正十六烷等烃类（06-016）在油/水乳状液中的液滴生长过程。DLS结果表明，随着烃链长度的增加，液滴尺寸的增长速率减小。正己烷液滴在1 h内从亚微米级增长到微米级，而正十六烷液滴在24 h内保持稳定，其粒径仅为几十nm。根据Lifshitz-Slyozov-瓦格纳理论和Smoluchowski方程，确定了生长过程为合并和分子扩散（Ostwald熟化）。此外，FFEM被用来详细研究的生长机制。正己烷和环己烷液滴的FFEM直接成像使我们能够观察到非常细的油滴（约。直径10 nm），虽然DLS不能检测到这些液滴，这表明细液滴较短的烃，如正己烷和环己烷的增长通过分子扩散和聚结过程在很短的时间后制备。

项目成果

T.Sakai: "Pyrene Fluorescence Measurements of Metastable Oil Droplets in Surfactant-Free Oil-in-Water Emulsions."Colloid and Polymer Science. 280. 99-106 (2002)

T.Sakai：“无表面活性剂的水包油乳液中亚稳态油滴的芘荧光测量”。胶体与聚合物科学。

T.Imura, K.Otake, S.Hashimoto, T.Gotoh, M.Yuasa, S.Yokoyama, H.Sakai, J.F.Rathman, M.Abe: "Preparation and Physicochemical Properties of Various Soybean Lecithin Liposomes Using Supercritical Reverse Phase Evaporation Method"Colloids and Surfaces, B : Bio

T.Imura、K.Otake、S.Hashimoto、T.Gotoh、M.Yuasa、S.Yokoyama、H.Sakai、J.F.Rathman、M.Abe：“使用超临界反相蒸发法制备各种大豆卵磷脂脂质体及其理化性质

T.Imura: "Preparation and Physicochemical Properties of Various Soybean Lecithin Liposomes Using Supercritical Reverse Phase Evaporation Method"Colloids and Surfaces, B Biointerfaces. 27(2-3). 133-140 (2003)

T.Imura：“使用超临界反相蒸发法制备各种大豆卵磷脂脂质体及其理化性质”胶体和表面，B 生物界面。

T.Sakai, H.Sakai, M.Abe: "Dimpled Polymer Particles Prepared by a Single-Step Method in an Acoustic Field"Langmuir. 18(10). 3763-3766 (2002)

T.Sakai、H.Sakai、M.Abe：“在声场中通过一步法制备凹坑聚合物颗粒”Langmuir。

T.Sakai: "Pyrene Fluorescence Measurements of Metastable Oil Droplets in Surfactant-Free Oil-in-Water Emulsions"Colloid and Polymer Science. 280. 99-106 (2002)

T.Sakai：“无表面活性剂的水包油乳液中亚稳态油滴的芘荧光测量”胶体和聚合物科学。