Encryption/decryption and microtarget capturing by pH-driven Janus microstructures fabricated by the same femtosecond laser printing parameters  

作　　者：Zhaoxin Lao Rui Sun Dongdong Jin Zhongguo Ren Chen Xin Yachao Zhang Shaojun Jiang Yiyuan Zhang Li Zhang 

机构地区：[1]Department of Mechanical and Automation Engineering,The Chinese University of Hong Kong,Sha Tin,Hong Kong,People’s Republic of China [2]CAS Key Laboratory of Mechanical Behavior and Design of Materials,Key Laboratory of Precision Scientific Instrumentation of Anhui Higher Education Institutes,Department of Precision Machinery and Precision Instrumentation,University of Science and Technology of China,Hefei,Anhui 230027,People’s Republic of China [3]Chengdu Fine Optical Engineering Research Center,Chengdu 610041,People’s Republic of China

出　　处：《International Journal of Extreme Manufacturing》2021年第2期89-97,共9页极端制造（英文）

基　　金：the Hong Kong Scholar Program (XJ2018035) for their financial support;supported by Research Grants Council of Hong Kong (No. JLFS/E-402/18);National Natural Science Foundation of China (No. 51805509)。

摘　　要：Several natural organism can change shape under external stimuli. These natural phenomena have inspired a vast amount of research on exploration and implementation of reconfigurable shape transformation. The Janus structure is a promising approach to achieve shape transformation based on its heterogeneous chemical or physical properties on opposite sides.However, the heterogeneity is generally realized by multi-step processing, different materials,and/or different processing parameters. Here, we present a simple and flexible method of producing p H-sensitive Janus microactuators from a single material, using the same laser printing parameters. These microactuators exhibit reversible structural deformations with large bending angles of ~31°and fast response(~0.2 s) by changing the p H value of the aqueous environment. Benefited from the high flexibility of the laser printing technique and the spatial arrangements, pillar heights, and bending directions of microactuators are readily controlled,enabling a variety of switchable ordered patterns and complex petal-like structures on flat surfaces and inside microchannels. Finally, we explore the potential applications of this method in information encryption/decryption and microtarget capturing.

关 键 词：micro actuator smart material pH hydrogel Janus structure laser printing 

分 类 号：TN249[电子电信—物理电子学]