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Rapid One Step Fabrication of Hydrophilic Hierarchical Porous PDMS with Negative Piezopermittivity for Sensing and Energy Storage Applications
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2022-02-04 , DOI: 10.1021/acsapm.1c00593 Chithra Parameswaran 1 , Raghvendra Pratap Chaudhary 2 , Sagar Hosangadi Prutvi 1 , Dipti Gupta 1
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2022-02-04 , DOI: 10.1021/acsapm.1c00593 Chithra Parameswaran 1 , Raghvendra Pratap Chaudhary 2 , Sagar Hosangadi Prutvi 1 , Dipti Gupta 1
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A simple, cost-effective, scalable, one step synthesis method for obtaining a hydrophilic poly(dimethylsiloxane) (PDMS) sponge using an effervescence template and surfactant is provided here. The porosity of the sponge can be tuned (∼25% to ∼60%) by varying the yeast concentration, volume, and curing temperature. A confined dispersion for standard deviation of pore parameters from statistical analysis shows good repeatability, homogeneity, and convergence of sponge porosity and pore area. A contact angle study shows the hydrophilic nature of the obtained sponge with the introduction of the surfactant. Fourier transform infrared spectroscopy (FTIR) confirms the single-step process with the absence of alive yeast cell constituents with the synergetic effect of PDMS backbone and hydrophilic moieties alone. In-situ tomography compression study shows little deviation (∼4%) in pore structure for before and after load applied conditions of sponge with good resilience. The sponge exhibits negative piezopermittivity with applied pressure due to the densification of pores leading to dipole cancellation. The bare sponge is applied to capacitive sensing for large pressure range sensing (sensitivity ∼0.03 kPa–1, < 45 kPa) and modified as a resistive pressure sensor (sensitivity ∼0.3 kPa–1, < 10 kPa; ∼0.02 kPa–1, <50 kPa), to human–machine interfacing, and as supercapacitor (∼11.43 mF/g) electrode.
中文翻译：
用于传感和储能应用的负压介电性亲水分层多孔 PDMS 的快速一步制造
此处提供了一种使用泡腾模板和表面活性剂获得亲水性聚 (二甲基硅氧烷) (PDMS) 海绵的简单、经济高效、可扩展的一步合成方法。通过改变酵母浓度、体积和固化温度，可以调整海绵的孔隙率（~25% 到~60%）。来自统计分析的孔隙参数标准偏差的受限分散表明海绵孔隙率和孔隙面积具有良好的可重复性、均匀性和收敛性。接触角研究显示了在引入表面活性剂后所得海绵的亲水性。傅里叶变换红外光谱 (FTIR) 证实了没有活酵母细胞成分的单步过程，仅具有 PDMS 主链和亲水部分的协同作用。原位断层扫描压缩研究表明，具有良好弹性的海绵在加载前后的孔隙结构几乎没有偏差（~4%）。由于孔致密化导致偶极子抵消，海绵在施加压力时表现出负压介电常数。裸海绵应用于大压力范围感应的电容感应（灵敏度 ∼0.03 kPa–1 , < 45 kPa) 并修改为电阻式压力传感器 (灵敏度 ∼0.3 kPa –1 , < 10 kPa; ∼0.02 kPa –1 , <50 kPa), 用于人机接口, 并作为超级电容器 (∼11.43 mF /g) 电极。
更新日期：2022-02-04
中文翻译：
用于传感和储能应用的负压介电性亲水分层多孔 PDMS 的快速一步制造
此处提供了一种使用泡腾模板和表面活性剂获得亲水性聚 (二甲基硅氧烷) (PDMS) 海绵的简单、经济高效、可扩展的一步合成方法。通过改变酵母浓度、体积和固化温度，可以调整海绵的孔隙率（~25% 到~60%）。来自统计分析的孔隙参数标准偏差的受限分散表明海绵孔隙率和孔隙面积具有良好的可重复性、均匀性和收敛性。接触角研究显示了在引入表面活性剂后所得海绵的亲水性。傅里叶变换红外光谱 (FTIR) 证实了没有活酵母细胞成分的单步过程，仅具有 PDMS 主链和亲水部分的协同作用。原位断层扫描压缩研究表明，具有良好弹性的海绵在加载前后的孔隙结构几乎没有偏差（~4%）。由于孔致密化导致偶极子抵消，海绵在施加压力时表现出负压介电常数。裸海绵应用于大压力范围感应的电容感应（灵敏度 ∼0.03 kPa–1 , < 45 kPa) 并修改为电阻式压力传感器 (灵敏度 ∼0.3 kPa –1 , < 10 kPa; ∼0.02 kPa –1 , <50 kPa), 用于人机接口, 并作为超级电容器 (∼11.43 mF /g) 电极。
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