Motion of Enzyme-Powered Microshell Motors.
Chengtao Chen1, Zhengqing He2, Jie Wu1
1State Key Laboratory of Analytical Chemistry for Life Science, School of Chemistry and Chemical Engineering, Nanjing University, 163 xianlin Road, Nanjing, 210023, P. R. China.
Chemistry, an Asian Journal
|May 16, 2019
Summary
Enzyme-powered microshell motors propelled by bubble generation exhibit size-dependent motion. Catalase modification on concave multimetallic microshells enables autonomous movement, crucial for micromotor design.
Area of Science:
- Nanotechnology
- Materials Science
- Chemical Engineering
Background:
- Microshells offer efficient bubble formation on concave surfaces for micromotor construction.
- Enzyme-powered micromotors utilize catalytic reactions for propulsion.
Purpose of the Study:
- To fabricate and investigate the motion behavior of enzyme-powered microshell motors.
- To explore the influence of size and fuel concentration on motor performance.
Main Methods:
- Fabrication of multimetallic (Au/Ag/Au) microshells.
- Modification of microshell concave surfaces with catalase.
- Observation and analysis of bubble generation and motor motion under varying conditions.
Main Results:
- Catalase on microshells decomposes hydrogen peroxide, generating oxygen bubbles for propulsion.
- Microshell motors exhibit size-dependent motion: slow tremble (<5 μm) and fast translation (>5 μm).
- Fuel concentration affects motion speed, influenced by mass transfer limitations within the microshell.
Conclusions:
- The study demonstrates effective enzyme-powered propulsion using modified microshells.
- Findings highlight the critical role of bubble dynamics and size in micromotor performance.
- Results provide insights for designing advanced bubble-propelled microshell motors.
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