Emergence of Ring‐Shaped Microstructures in Restricted Geometries Containing Self‐Propelled, Catalytic Janus Spheres
Emergence of Ring‐Shaped Microstructures in Restricted Geometries Containing Self‐Propelled, Catalytic Janus Spheres
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包含自驱动催化 Janus 球的受限几何形状中环形微结构的出现
DOI：
10.1002/cnma.202100122
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发表时间：
2021
期刊：
影响因子：
3.8
通讯作者：
Gibbs, John G.
中科院分区：
文献类型：
--
作者：
Pariente, Jose Ángel;Blanco, Álvaro;López, Cefe;Gibbs, John G.
含有胶体的液滴的蒸发是一种无所不在的自然现象，由于其所带来的基本效应以及其可以应用的众多领域而受到广泛关注。在蒸发过程中，颗粒沉积在固体表面上往往会形成环状污渍，这是“咖啡环效应”的标志。已经采用了各种各样的系统来抑制或实现这种效应，然而，很少有人关注被驱动远离平衡的受限几何形状的粒子。在这里，我们研究了自推进的“活性”催化Janus微球如何影响含有此类颗粒的几何限制悬浮液干燥过程中留下的环斑。自推进间接来自催化活性半球壳上的过氧化氢（H2 O2）的分解，而直径相对的面是惰性的;这就是系统被驱动出平衡的方式。活性的大小可以通过调节悬浮液中H2 O2水溶液的体积浓度来控制。该参数强烈影响所获得的环形微结构，特别是当浓度足够高以产生接管运动的氧气泡时，而不是自泳。
The evaporation of liquid droplets containing colloids is an omnipresent natural phenomenon that has received much attention due to the fundamental effects it entails, as well as the multitudes of fields in which it can be applied. The deposition of particulates onto a solid surface during evaporation tends to form ring‐like stains, which are a hallmark of the “coffee‐ring effect.” A wide variety of systems has already been employed to suppress or enable this effect, however, little attention has been focused on particles in restricted geometries that are driven far from equilibrium. Here, we investigate how self‐propelled, “active” catalytic Janus microspheres affect the ring stains left behind during the drying of a geometrically confined suspension containing such particles. Self‐propulsion results indirectly from the decomposition of hydrogen peroxide (H2O2) on the catalytically active hemispherical shell, while the diametrically opposite face is inert; this is how the system is driven out of equilibrium. The magnitude of activity can be controlled by adjusting the volume concentration of aqueous H2O2within the suspension. This parameter strongly influences the ring‐shaped microstructures obtained, especially when the concentration is sufficiently high to produce oxygen bubbles that take over the motion as opposed to auto‐phoresis.
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DOI：
10.1140/epjst/e2016-60058-2
发表时间：
2016-11
期刊：
The European Physical Journal Special Topics
影响因子：
--
作者：
M. N. Popescu;W. Uspal;S. Dietrich
通讯作者：
M. N. Popescu;W. Uspal;S. Dietrich
影响因子：
2.4
作者：
Ebbens, Stephen;Tu, Mei-Hsien;Golestanian, Ramin
通讯作者：
Golestanian, Ramin
影响因子：
5.5
作者：
Eslami, Hossein;Khani, Marzieh;Mueller-Plathe, Florian
通讯作者：
Mueller-Plathe, Florian
影响因子：
29.4
作者：
Singh, Dhruv P.;Choudhury, Udit;Mark, Andrew G.
通讯作者：
Mark, Andrew G.
通过时间和温度相关的 Hong-Ou-Mandel 实验探索固态量子发射器的相移
DOI：
--
发表时间：
2016
期刊：
影响因子：
--
作者：
Alexander Thoma;Peter Schnauber;M. Gschrey;M. Seifried;J. Wolters;Schulze J.‐H.;A. Strittmatter;S. Rodt;A. Carmele;A. Knorr;Tobias Heindel;S. Reitzenstein
通讯作者：
S. Reitzenstein