期刊
ACS APPLIED NANO MATERIALS
卷 1, 期 8, 页码 3998-4004出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsanm.8b00766
关键词
thermophoresis; optothermal manipulation; thermoelectric effect; depletion force; colloidal particles; hydrogels
资金
- Army Research Office [W911NF-17-1-0561]
- National Institute of General Medical Sciences of the National Institutes of Health [DP2GM128446]
Light-based manipulation of colloidal particles holds great promise in fabrication of functional devices. Construction of complex colloidal superstructures using traditional optical tweezers is limited by high operation power and strong heating effect. Herein, we demonstrate low-power opto-thermophoretic manipulation and construction of colloidal superstructures in photocurable hydrogels. By introducing cationic surfactants into a hydrogel solution under a light-directed temperature field, we create both thermoelectric fields and depletion attraction forces to control the suspended colloidal particles. The particles of various sizes and compositions are thus trapped and organized into various superstructures. Furthermore, the colloidal superstructures are immobilized and patterned onto solid-state substrates through UV-induced photopolymerization of the hydrogel. Our opto-thermophoretic technique will open up avenues for bottom-up assembly of colloidal materials and devices.
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