期刊
ACS APPLIED MATERIALS & INTERFACES
卷 8, 期 27, 页码 17668-17675出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.6b04192
关键词
micro/nanopatternin; polymer film; electrohydrodynamics; hysteresis phenomenon; numerical modeling
资金
- National Natural Science Foundation of China [11372243, 11532009, 11522219]
- China Postdoctoral Science Foundation [2015M570826]
- Fundamental Research Funds for the Central Universities [xjj2016074]
- National Engineering Laboratory for Highway Maintenance Equipment (Chang'an University) [310825161103]
- Foundation of Shaanxi Postdoctoral Science
Electrohydrodynamic patterning is a technique that enables micro/nanostructures via imposing an external voltage on thin polymer films. In this investigation, we studied the electrohydrodynamic patterning theoretically and experimentally, with special interest focused on the equilibrium state. It is found that the equilibrium structure height increases with the voltage. In addition, we have observed, and believe it to be the first time, a hysteresis phenomenon exists in the relationship between the voltage and structure height. With an increase in the voltage, a critical value (the first critical voltage) is noticed, above which the polymer film would increase dramatically until it comes into contact with the template. However, with a decrease in the voltage, a smaller voltage (the second critical voltage) is needed to detach the polymer from the template. The mismatch of the first and second critical voltages distorts the voltage structure height curve into an S shape. Such a phenomenon is verified for three representative templates and also by experiments. Furthermore, the effects of some parameters (e.g., polymer film thickness and dielectric constant) on this hysteresis phenomenon are also discussed.
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