在纤维素中自发浸泡:一种吸收介导的非卢卡斯-沃什本现象
Kang Hu1, Benjamin Maillet1, Jaime Gil-Roca1
1NAVIER Laboratory, (Université Gustave Eiffel, Ecole Nationale des Ponts et Chaussées | Institut Polytechnique de Paris, CNRS), Champs-sur-Marne, 77420, France.
Journal of colloid and interface science
|December 4, 2025
概括
纤维素中的水浸泡速度比卢卡斯-沃什本模型预测的要慢,这是由于结合的水吸收. 有限水在自由水前面移动,表明在湿透的多孔材料中合运输.
科学领域:
- 孔隙介质物理学的物理
- 材料科学是一种材料科学.
- 生物材料是一种生物材料.
背景情况:
- 卢卡斯-沃什本模型描述了基于毛细血管力在多孔介质中的液体透.
- 液晶纤维素材料吸收水,导致胀,并可能改变运输动态.
- 纤维素中受限水的吸收可能导致合双相运输行为,偏离标准模型.
研究的目的:
- 为了研究水浸泡在多孔纤维素堆中的动态.
- 在纤维素纤维网络中区分自由和结合水的运输.
- 评估古典卢卡斯-沃什本模型对湿透纤维素材料的适用性.
主要方法:
- 使用了光学成像,重力测量,核磁共振 (NMR) 和磁共振成像 (MRI).
- 在无限和有限的供水条件下进行了实验.
- 这些技术允许独立跟踪自由和受束的水流动和样本膨胀.
主要成果:
- 宏观水面的进展遵循平方根的时间依赖性,但沉浸速度比Lucas-Washburn模型预测的慢10-100倍.
- 磁共振成像显示,自由水和了前面背后的孔隙,而结合水则逐渐和了自由水前面的纤维素纤维.
- 观察到自由和受束的水面之间有明显的分离,这表明单独的毛细血管力不足以解释动态.
结论:
- 经典的卢卡斯-沃什本模型并不直接适用于液晶纤维素材料中的水浸泡.
- 限制水吸收对水运输产生重大影响,导致结合的两相流动力学.
- 这些发现挑战了关于光孔隙介质的界面现象的标准假设.
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