Fatty acid chemistry at the oil-water interface: Self-propelled oil droplets
Fatty acid chemistry at the oil-water interface: Self-propelled oil droplets
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DOI：
10.1021/ja0706955
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发表时间：
2007-08-01
影响因子：
15
通讯作者：
Sugawara, Tadashi
中科院分区：
文献类型：
--
作者：
Hanczyc, Martin M.;Toyota, Taro;Sugawara, Tadashi
脂肪酸由于其动态特性和相变特性而被研究作为构建人工细胞的边界结构。在这里，我们探索了脂肪酸系统也表现出运动的可能性。油相装载脂肪酸酸酐前驱体，并引入脂肪酸胶束水溶液。油滴在水介质中表现出自主、持续的运动。内部对流形成了一个正反馈回路，对流驱动新鲜前驱体到表面水解，油滴的运动得以持续。随着体系的发展，表面活性剂的生成越来越多，一些油滴转化为类似多层囊泡的超分子聚集体。油滴也在化学梯度内定向移动，并表现出一种趋化性。
Fatty acids have been investigated as boundary structures to construct artificial cells due to their dynamic properties and phase transitions. Here we have explored the possibility that fatty acid systems also demonstrate movement. An oil phase was loaded with a fatty acid anhydride precursor and introduced to an aqueous fatty acid micelle solution. The oil droplets showed autonomous, sustained movement through the aqueous media. Internal convection created a positive feedback loop, and the movement of the oil droplet was sustained as convection drove fresh precursor to the surface to become hydrolyzed. As the system progressed, more surfactant was produced and some of the oil droplets transformed into supramolecular aggregates resembling multilamellar vesicles. The oil droplets also moved directionally within chemical gradients and exhibited a type of chemotaxis.