Gravitropically Stabilized Self‐Assembly of Active Microcrystallites and Spinning Free Janus Particles
Gravitropically Stabilized Self‐Assembly of Active Microcrystallites and Spinning Free Janus Particles
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活性微晶和自由旋转 Janus 粒子的重力稳定自组装
DOI：
10.1002/ppsc.202100232
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发表时间：
2021
影响因子：
2.7
通讯作者：
Nourhani, Amir
中科院分区：
文献类型：
--
作者：
Nabavizadeh, Seyed Amin;Castañeda, John;Gibbs, John G.;Nourhani, Amir
引入能够在其多孔网络周围或通过其多孔网络产生流型的活性胶体微晶，其与“自由微球”结合，产生具有多个移动部件的自组装活性簇。流体流动将微晶局部环境中的微球拉向微晶边缘并在微晶边缘聚集，在那里先前的平移运动转变为连续旋转。这些实验表明，自旋频率随着直径的增加而降低，并且当自旋粒子的质心偏离中心时-这里是Janus球体-观察到时变角频率。重量各向异性还导致了一个特别有趣的现象，表现为旋转轴向优先方向的自发重新排列;这种效应归因于重力自校正机制。因此，自组装活性结构的动力学在长时间内保持稳定，尽管受到显著的噪声，例如布朗力。
Active colloidal microcrystallites capable of generating flow patterns around or through their porous network are introduced, which in combination with “free microspheres,” create self‐assembled active clusters with multiple moving parts. Fluid flow draws microspheres within a microcrystallite's local environment toward—and aggregate at—the edge of the microcrystallite, where the previously translational movement transitions to continuous spinning. These experiments show that the spinning frequency decreases with an increase in diameter and that when the center of mass of a spinning particle is shifted off‐center—here Janus spheres—a time‐varying angular frequency is observed. Weight‐anisotropy also leads to a particularly intriguing phenomenon, which manifests as the spontaneous realignment of the rotational axis to a preferential direction; this effect is attributed to a gravitropic self‐correcting mechanism. Thus, the dynamics of the self‐assembled active structure remains stable over long time periods, despite being subjected to significant noise, for example, Brownian forces.
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DOI：
--
发表时间：
2018
期刊：
The European Physical Journal E : Soft matter
影响因子：
--
作者：
Mihail N. Popescu;Mihail N. Popescu;W. Uspal;W. Uspal;Zahra Eskandari;Zahra Eskandari;M. Tasinkevych;Siegfried Dietrich;Siegfried Dietrich
通讯作者：
Siegfried Dietrich
催化微型电机之间的相互作用
DOI：
--
发表时间：
2015
期刊：
影响因子：
--
作者：
P. Bayati;A. Najafi
通讯作者：
A. Najafi
影响因子：
15
作者：
Ibele, Michael E.;Wang, Yang;Sen, Ayusman
通讯作者：
Sen, Ayusman
影响因子：
29.4
作者：
Nourhani, Amir;Brown, Daniel;Gibbs, John G.
通讯作者：
Gibbs, John G.
影响因子：
7.3
作者：
MCKEE, DW
通讯作者：
MCKEE, DW