Measurement of water uptake in thin-film Nafion and anion alkaline exchange membranes using the quartz crystal microbalance
Measurement of water uptake in thin-film Nafion and anion alkaline exchange membranes using the quartz crystal microbalance
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DOI：
10.1016/j.memsci.2015.09.027
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发表时间：
2016
影响因子：
9.5
通讯作者：
V. Bharath;J. Millichamp;T. Neville;T. Mason;P. Shearing;Richard J. C. Brown;G. Manos;D. Brett
中科院分区：
文献类型：
--
作者：
V. Bharath;J. Millichamp;T. Neville;T. Mason;P. Shearing;Richard J. C. Brown;G. Manos;D. Brett
利用石英晶体微天平（QCM）研究了薄膜Nafion和市售的Tokuyama碱性阴离子交换膜离聚物的吸水、吸附力学和溶胀特性。吸水率测量每个官能团由离聚物吸附的水分子的数量，并使用QCM频率响应原位测定，允许与纳克精度进行比较。晶体导纳谱，沿着与等效电路拟合，适用于这两种薄膜的第一次，并用于调查的离聚物的粘弹性变化在水合过程中，阐明在低，中，高相对湿度在发挥作用的机制。
Water uptake, sorption mechanics and swelling characteristics of thin-film Nafion and a commercially available Tokuyama alkaline anion exchange membrane ionomer from the vapour phase is explored using a quartz crystal microbalance (QCM). The water uptake measures the number of water molecules adsorbed by the ionomer per functional group and is determinedin-situusing the QCM frequency responses allowing for comparison with nanogram precision. Crystal admittance spectroscopy, along with equivalent circuit fitting, is applied to both thin films for the first time and is used to investigate the ionomer's viscoelastic changes during hydration; to elucidate the mechanisms at play during low, medium and high relative humidities.