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复杂流体中纳米粒子反常扩散实验研究
Authors
胡国庆
薛春冬
郑旭
Publication date
21 January 2018
Publisher
Abstract
扩散是纳米尺度下最常见的粒子运动及物质输运方式。与简单流体中布朗扩散不同,在复杂流体中,纳米粒子运动受到其附近流体非均匀结构的影响,将表现出反常的受限扩散特性。本文利用粒子跟踪技术,实验测量了不同尺寸的纳米粒子(40-500nm)在不同浓度和分子量的聚环氧乙烷溶液中的扩散运动。结果显示纳米粒子反常扩散运动的非高斯性源自少量粒子的"跳跃扩散(hopping diffusion)"。并进一步解释了复杂流体浓度进一步提高后跳跃扩散的行为特征,给出了全新的标度律和特征时间尺度
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Institute Of Mechanics,Chinese Academy of Sciences
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Last time updated on 09/01/2019