Abstract
Polymer-liquid crystals(PLCs)are common materials for smart windows.However,PLC smart windows usually require high driving voltage to maintain transparency.We synthesized a novel PLC smart film by doping multi-wall carbon nanotubes(MWCNTs)into a reverse-mode polymer network liquid crystal(R-PNLC).It is found that doping MWCNTs could effectively reduce the threshold voltage(Vth)of R-PNLC from 19.0 V to 8.4 V.Due to co-orientation between MWCNT and LC molecules,the doped R-PNLC is able to maintain a high transmittance of visible light(～80％)without an applied electric field.We find that doping MWCNTs could change the frequency modulation property of R-PNLC.The doped R-PNLC exhibits a wider frequency modulation range up to 40000 Hz,while the frequency modulation of the undoped R-PNLC reached to a saturation at 23000 Hz.We also tested the electromagnetic interference(EMI)shielding efficiency of R-PNLC and find that the EMI shielding efficiency could be improved by doping only 0.01 wt％MWCNTs into the system.The total shielding effectiveness of 0.01 wt％MWCNT doped R-PNLC was up to 14.91 dB in the frequency band of 5.38-8.17 GHz.This study demonstrates that the films are potentially useful for low-energy-consumption smart windows with enhanced electromagnetic shielding capability.
基金项目
China National Key Research and Development Program during the 14th Five-Year Plan Period(2023YFB3811600)
Major Program of Harbin Institute of Technology(2023FRFK01002)
维普
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