發(fā)布時(shí)間：2018-01-20 23:30

  本文關(guān)鍵詞： 熵力 自驅(qū)動(dòng)顆粒體系 非平衡態(tài) 過阻尼郎之萬方程　出處：《物理學(xué)報(bào)》2017年19期 　論文類型：期刊論文

【摘要】：在許多納米復(fù)合材料體系中熵力(entropy force)是普遍存在的,但由于熵力的存在會(huì)導(dǎo)致納米顆粒的凝聚從而降低其許多性能,因此在大多數(shù)情況下熵力的存在對(duì)體系并無益處,所以研究如何減小熵力對(duì)體系的影響是非常重要的.不帶角速度的自驅(qū)動(dòng)粒子在熵力作用下會(huì)集聚在納米顆粒(或者納米棒)周圍,這會(huì)對(duì)納米顆粒(或者納米棒)產(chǎn)生很大的相互作用力.對(duì)于納米顆粒,在不帶角速度的自驅(qū)動(dòng)粒子體系中存在著非常大的排斥力.而對(duì)于納米棒,由于納米棒內(nèi)外的不對(duì)稱性,使得兩個(gè)納米棒之間會(huì)產(chǎn)生吸引-排斥轉(zhuǎn)變,同時(shí)這個(gè)吸引-排斥轉(zhuǎn)變與納米棒之間的距離有關(guān).當(dāng)自驅(qū)動(dòng)粒子加上一個(gè)自轉(zhuǎn)角速度ω之后,熵力的作用就大大減弱,納米顆粒不再集聚.研究結(jié)果有助于對(duì)非平衡態(tài)下納米顆粒(或納米棒)之間熵相互作用力的認(rèn)識(shí).
[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.
【作者單位】： 浙江大學(xué)物理系;
【基金】：國家自然科學(xué)基金(批準(zhǔn)號(hào):21374102,21674096)資助的課題~~
【分類號(hào)】：O347.7;TB383.1
【正文快照】： 1引言 熵力(entropy force)是指一個(gè)體系中的一種宏觀作用力,其性質(zhì)主要不是由體系中某種特定的微觀作用力決定,而是表現(xiàn)為整個(gè)體系對(duì)于熵X椉擁耐臣魄魘芔,21.在許多納米復(fù)合材料體系中普遍存在熵力,但由于熵力的存在會(huì)導(dǎo)致納米顆粒的凝聚,從而降低其許多性能,因此在大多數(shù)情

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