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Dually Synergetic Network Hydrogels with Integrated Mechanical Stretchability, Thermal Responsiveness, and Electrical Conductivity for Strain Sensors and Temperature Alertors
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posted on 2018-04-02, 00:00 authored by Zhiwen Wang, Hongwei Zhou, Weixing Chen, Qiuzhao Li, Bo Yan, Xilang Jin, Aijie Ma, Hanbin Liu, Weifeng ZhaoThe
first example of dually synergetic network hydrogel, which has integrated
mechanical stretchability, thermal responsiveness, and electrical
conductivity, has been constructed by a versatile and topological
co-cross-linking approach. Poly(N-isopropylacrylamide)
(PNIPAAm) is introduced as the thermally responsive ingredient, and
polyaniline (PANI) is selected as the electrically conductive ingredient.
PNIPAAm network is cross-linked by double-bond end-capped Pluronic
F127 (F127DA). PANI network is doped and cross-linked by phytic acid.
These two ingredients are further mechanically interlocked. Due to
the integrated multiple functionalities, the topologically co-cross-linked
hydrogels, as will be mentioned as F-PNIPAAm/PANI hydrogels, can be
fabricated into resistive-type strain sensors. The strain sensors
can achieve a gauge factor of 3.92, a response time of 0.4 s, and
a sensing stability for at least 350 cycles and can be further applied
for monitoring human motions, including motion of two hands, bending
of joints, and even swallowing and pulse rate. Moreover, F-PNIPAAm/PANI
hydrogels are utilized to construct efficient temperature alertors
based on the disconnection of circuits induced by volume shrinkage
at high temperature.
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strain sensorsElectrical ConductivityTemperature AlertorsStrain SensorsDually Synergetic Network Hydrogelsresponse timeF 127DA PANI networkphytic acidtopologically co-cross-linked hydrogelsF-PNIPAAmThermal Responsiveness350 cyclesconductive ingredientdouble-bond end-capped Pluronic F 127gauge factorresistive-type strain sensorspulse ratePNIPAAm networkIntegrated Mechanical Stretchabilitydually synergetic network hydrogeltemperature alertorstopological co-cross-linking approachvolume shrinkage
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