期刊
ACS NANO
卷 12, 期 9, 页码 8994-9004出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.8b02470
关键词
droplets; loss-free manipulation; photocontrol maneuver; superhydrophobic surfaces; pyroelectricity
类别
资金
- Research Grants Council of Hong Kong [CRF C1018-17G, GRF 17204718, 17237316, 17211115, 17207914]
- University of Hong Kong [URC 201511159108, 201411159074, 201311159187]
- Zhejiang Provincial Government
- Hangzhou Municipal Government
- Lin'an County Government
Manipulation of tiny amounts of liquid is a fundamental technique for miniaturized diagnostic, analyzing, and synthetic processes. Among diverse maneuver methods, light-controlled liquid manipulation stands out because of its ready controllability, high spatial precision, and noncontact feature of light. As light controls the motion of liquid droplets, substantial liquid loss frequently accompanies, leading to reduced sample volume, contaminated devices, and erroneous results. Here, we report a light-controlled droplet-maneuver method based on pyroelectro-trapping on superhydrophobic surfaces. On such a platform, a light source traps and guides the droplet on a nonwetting surface remotely, offering a precise and loss-free droplet transport that eliminates intersample cross-contaminations. Our approach provides a simplified, facile, and compact platform which is suitable for repeated and multistep usages. Droplet-based microreactions and enhanced mixing inside tiny droplets are effectively demonstrated using the platform. The photocontrolled loss-free droplet maneuver is very promising for applications like chemical/bioassays, microfluidics, and liquid transfer.
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