Water flow in poly(N-isopropylacrylamide) gels.
Water flow in poly(N-isopropylacrylamide) gels.
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DOI：
10.1063/1.2364893
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发表时间：
2006-11
期刊：
影响因子：
--
通讯作者：
A. Suzuki;M. Yoshikawa
中科院分区：
文献类型：
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作者：
A. Suzuki;M. Yoshikawa
研究了聚（N-异丙基丙烯酰胺）凝胶的聚合物网络和溶剂水之间的摩擦。凝胶在凝胶化时被机械约束在玻璃毛细管中，并且静水压力直接施加到圆柱体的横截面。在胶凝时不同长度 l(0) 的凝胶在转变温度附近广泛测量了流速对温度的依赖性。随着温度升高，摩擦力在转变点略有下降，并在塌陷相迅速增加。尽管流速取决于 l(0)，但根据毛细管中水流通量的 Hagen-Poiseuille 方程，过渡点附近的摩擦力可以通过 l(0) 很好地缩放。结果表明，凝胶是一束微毛细管的假设适用于流过水凝胶的水流，水凝胶的变形不仅受到施加在溶剂上的压力的影响，而且还受到温度升高引起的收缩力的影响。宏观变形不影响三维聚合物网络与水之间的摩擦力。
Friction between a polymer network of poly(N-isopropylacrylamide) gels and solvent water was investigated. The gel was mechanically constrained in a glass capillary at gelation, and hydrostatic pressure was directly applied to the cross section of the cylinder. The temperature dependence of the flow velocity was extensively measured in the vicinity of the transition temperature for gels with different lengths, l(0), at gelation. As the temperature increased, the friction slightly decreased at the transition point and increased rapidly in the collapsed phase. Although the flow velocity depended on l(0), the friction in the vicinity of the transition point was well scaled by l(0) based on the Hagen-Poiseuille equation for the flux of water flow in a capillary. The results suggested that the assumption that the gel is a bundle of microcapillaries was applicable to the water flow through the hydrogel, which was largely deformed not only by the pressure applied to the solvent but also by the shrinking force caused by the temperature increment. Macroscopic deformation did not affect the friction between the three-dimensional polymer network and water.