Chemically Controlled Spatiotemporal Oscillations of Colloidal Assemblies

被引:63
作者
Altemose, Alicia [1 ]
Sanchez-Farran, Maria Antonieta [2 ]
Duan, Wentao [1 ]
Schulz, Steve [3 ]
Borhan, Ali [2 ]
Crespi, Vincent H. [1 ,4 ,5 ]
Sen, Ayusman [1 ]
机构
[1] Penn State Univ, Dept Chem, University Pk, PA 16802 USA
[2] Penn State Univ, Dept Chem Engn, University Pk, PA 16802 USA
[3] Manheim Township High Sch, Lancaster, PA 17606 USA
[4] Penn State Univ, Dept Phys, 104 Davey Lab, University Pk, PA 16802 USA
[5] Penn State Univ, Dept Mat Sci & Engn, University Pk, PA 16802 USA
关键词
colloids; diffusiophoresis; nanoparticles; oscillations; photocatalysis; MICROMOTORS; MOTORS; MOTION; NANOMOTORS; BEHAVIOR; SCIENCE;
D O I
10.1002/anie.201703239
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
We report an autonomous oscillatory micromotor system in which active colloidal particles form clusters, the size of which changes periodically. The system consists of an aqueous suspension of silver orthophosphate microparticles under UV illumination, in the presence of varying concentrations of hydrogen peroxide. The colloid particles first attract each other to form clusters. After a short delay, these clusters abruptly disperse and oscillation begins, alternating between clustering and dispersion of particles. After a cluster oscillation initiates, the oscillatory wave propagates to nearby clusters and eventually all the clusters oscillate in phase-shifted synchrony. The oscillatory behavior is governed by an electrolytic self-diffusiophoretic mechanism which involves alternating electric fields generated by the competing reduction and oxidation of silver. The oscillation frequency is tuned by changing the concentration of hydrogen peroxide. The addition of inert silica particles to the system results in hierarchical sorting and packing of clusters. Densely packed Ag3PO4 particles form a non-oscillating core with an oscillating shell composed largely of silica microparticles.
引用
收藏
页码:7817 / 7821
页数:5
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