用于微颗粒推进的发光气泡。

Light generated bubble for microparticle propulsion.

机构信息

Swiss Institute for Dryland Environmental and Energy Research, Blaustein Institutes for Desert Research, Ben-Gurion University of the Negev, Midreshet Ben-Gurion, Israel.

The Unit of Energy Engineering, Ben-Gurion University of the Negev, Beer-Sheva, Israel.

出版信息

Sci Rep. 2017 Jun 6;7(1):2814. doi: 10.1038/s41598-017-03114-z.

DOI:10.1038/s41598-017-03114-z

PMID:28588312

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5460221/

Abstract

Light activated motion of micron-sized particles with effective forces in the range of micro-Newtons is hereby proposed and demonstrated. Our investigation shows that this exceptional amount of force results from accumulation of light-generated heat by a micron-sized particle that translates into motion due to a phase transition in the nearby water. High-speed imagery indicates the role of bubble expansion and later collapse in this event. Comparing observations with known models reveals a dynamic behavior controlled by polytropic trapped vapor and the inertia of the surrounding liquid. The potential of the proposed approach is demonstrated by realization of disordered optical media with binary light-activated switching from opacity to high transparency.

摘要

本文提出并展示了一种利用微牛顿级有效力驱动微米级颗粒的光致运动方法。我们的研究表明，如此大的力是由微米级颗粒中光生热的积累引起的，这种热积累会导致附近水的相变，从而产生运动。高速成像表明，在这一过程中，气泡的膨胀和随后的收缩起到了关键作用。将观察结果与已知模型进行比较，揭示了一种由多物质被困蒸汽的动力学行为和周围液体的惯性控制的动态行为。通过实现从不透明到高透明的二元光致开关无序光学介质，证明了所提出方法的潜力。