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首页> 外文期刊>Proceedings of the Japan Academy, Series B. Physical and Biological Sciences >Colloidal dispersions confined in voids of polymer gel matrix
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Colloidal dispersions confined in voids of polymer gel matrix

机译：胶体分散体限制在聚合物凝胶基质的空隙中

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Dispersions of ionic polymer latex (diameter=600nm) consisted of 10 to 1000 particles were confined in spherical voids having diameters of several tens pm formed in a hydrogel (agarose) matrix. The system was constructed first by confining the latex dispersions in giant liposomes, immobilizing the liposomes by using the hydrogel matrix, and then removing the liposome membranes from the matrix. The latex particles inside the voids showed an extensive Brownian motion. This system, as a whole, could be regarded as a model system of one superfine particle. The solid-liquid phase transition was examined both for bulk and the confined colloids, by applying confocal laser scanning microscopy and phase contrast microscopy. The salt concentration was 2μM. In bulk, the solid-liquid phase boundary laid at particle concentration, Cp=1.0-1.5vol%. On the other hand, the confined dispersion took a liquid state even at Cp=2.5vol%. The present observation might correspond to a size effect for the melting point of a superfine particle system.
机译：由10至1000个颗粒组成的离子聚合物胶乳（直径= 600nm）的分散局限于具有在水凝胶（琼脂糖）基质中形成的几十μm的直径的球形空隙。首先通过将胶乳分散体限制巨脂素，通过使用水凝胶基质来固定脂质体，然后从基质中除去脂质体膜来构建该系统。空隙内的乳胶颗粒显示出广泛的布朗运动。作为一个整体，该系统可以被视为一个超细粒子的模型系统。通过施加共聚焦激光扫描显微镜和相位对比度显微镜，检查固体和狭窄胶体的固液相转变。盐浓度为2μm。在块状中，铺设颗粒浓度的固液相边界，Cp = 1.0-1.5Vol％。另一方面，即使在Cp = 2.5Vol％，狭窄的分散也患有液态。本观察可能对应于超细粒子系统的熔点的尺寸效应。

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