自驱动颗粒体系中的熵力

发布时间：2018-01-20 23:30

本文关键词： 熵力自驱动颗粒体系非平衡态过阻尼郎之万方程　出处：《物理学报》2017年19期 　论文类型：期刊论文

【摘要】：在许多纳米复合材料体系中熵力(entropy force)是普遍存在的,但由于熵力的存在会导致纳米颗粒的凝聚从而降低其许多性能,因此在大多数情况下熵力的存在对体系并无益处,所以研究如何减小熵力对体系的影响是非常重要的.不带角速度的自驱动粒子在熵力作用下会集聚在纳米颗粒(或者纳米棒)周围,这会对纳米颗粒(或者纳米棒)产生很大的相互作用力.对于纳米颗粒,在不带角速度的自驱动粒子体系中存在着非常大的排斥力.而对于纳米棒,由于纳米棒内外的不对称性,使得两个纳米棒之间会产生吸引-排斥转变,同时这个吸引-排斥转变与纳米棒之间的距离有关.当自驱动粒子加上一个自转角速度ω之后,熵力的作用就大大减弱,纳米颗粒不再集聚.研究结果有助于对非平衡态下纳米颗粒(或纳米棒)之间熵相互作用力的认识.
[Abstract]:Entropy force force is common in many nanocomposite systems. However, due to the existence of entropy force, it will lead to the aggregation of nanoparticles and reduce many of their properties. Therefore, in most cases, the existence of entropy force is not beneficial to the system. Therefore, it is very important to study how to reduce the effect of entropy force on the system. The self-driven particles with no angular velocity will gather around the nanoparticles (or nanorods) under the entropy force. For nanocrystalline particles, there is a very large repulsive force in the system of self-actuated particles without angular velocity, and for nanorods, there is a very large repulsion force on nanocrystalline particles (or nanorods). Because of the asymmetry inside and outside the nanorods, there will be an attractive repulsive transition between the two nanorods. At the same time, the attractive-repulsive transition is related to the distance between nanorods. When the self-driven particle is added with a rotation velocity 蠅, the entropy force is greatly weakened. The results are helpful to the understanding of entropy interaction between nanoparticles (or nanorods) in non-equilibrium state.
【作者单位】：浙江大学物理系;
【基金】：国家自然科学基金(批准号:21374102,21674096)资助的课题~~
【分类号】：O347.7;TB383.1
【正文快照】： 1引言熵力(entropy force)是指一个体系中的一种宏观作用力,其性质主要不是由体系中某种特定的微观作用力决定,而是表现为整个体系对于熵X椉拥耐臣魄魇芔,21.在许多纳米复合材料体系中普遍存在熵力,但由于熵力的存在会导致纳米颗粒的凝聚,从而降低其许多性能,因此在大多数情

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