paper 150411060446

Abstract

Microbubbles have stimulated broad attention for the highly-efficient contrast agents in biomedicine and microfluidic control. We present an optical technique to produce various kinds of microbubbles, using a near-infrared light exciting photothermal graphene oxide deposited on a microwire. As a heater, GO-deposition can absorb the evanescent field to produce heat energy, and then heat the solvent to create photothermal microbubbles. It can also trans- late the optical energy into the ultrasonic energy and compress the solvent to create cavitating microbubbles. Furthermore, a series of approximately ellipsoidal microbubbles can be generated on a smooth microwire due to heterogeneous nucleation.

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Xiang Cai

Sailing He

Xijun Li

Meng Shi

Kezhang Shi

Xiaobo Xing

Jianxin Yang

Jiapeng Zheng