微尺度Marangoni Surfers
Microscale Marangoni Surfers
摘要：
利用激光诱导吸附在油水界面上的Janus胶体的非对称加热，实现了活性微尺度的Marangoni表面活性剂。温度和表面活性剂浓度梯度的耦合产生Marangoni应力，导致自推进。颗粒速度跨越四个数量级，从微米/秒到厘米/秒，这取决于激光功率和表面活性剂浓度。实验合理化的有限元模拟，定义不同的推进制度相对于的热和溶质马兰戈尼应力分量的大小。
英文摘要：
We apply laser light to induce the asymmetric heating of Janus colloids adsorbed at water-oil interfaces and realize active micrometric "Marangoni surfers". The coupling of temperature and surfactant concentration gradients generates Marangoni stresses leading to self-propulsion. Particle velocities span four orders of magnitude, from microns/s to cm/s, depending on laser power and surfactant concentration. Experiments are rationalized by finite elements simulations, defining different propulsion regimes relative to the magnitude of the thermal and solutal Marangoni stress components.
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