Understanding and Modeling the Liquid Uptake in Porous Compacted Powder Preparations.
Understanding and Modeling the Liquid Uptake in Porous Compacted Powder Preparations.
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DOI：
10.1021/acs.langmuir.7b01334
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发表时间：
2017-07
期刊：
影响因子：
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通讯作者：
Jesús Esteban;T. Moxon;Tom A. H. Simons;S. Bakalis;P. Fryer
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作者：
Jesús Esteban;T. Moxon;Tom A. H. Simons;S. Bakalis;P. Fryer
多孔固体材料通常在制造过程中经过涂层处理，其中液体与固体接触以达到不同的目的。液体在多孔基质中的渗透研究在许多工业活动中都是一个高度相关的过程。特别是，粉末洗涤剂要涂上表面活性剂，以提高其性能，尽管这可能会影响流动性，甚至导致颗粒材料结块，这可能不利于消费者接受。在这里，我们提出了一种方法来制作与洗涤剂制造相关的粉末压实制剂，并通过x射线微计算机断层扫描来评估这种多孔基质的内部结构。采用基于连续循环的改进Wilhelmy plate法的重量技术，监测了制备过程中液体的渗透和液体的总质量吸收。考虑到系统的几何形状，提出了两个模型来描述基于质量（模型1）或压力（模型2）梯度驱动的过程的液体吸收。从统计和物理的角度进行比较，认为后者更适合描述0.03 × 10-12 ~ 0.95 × 10-12 m2之间的固体渗透率的过程和反演值。最后，利用从模型2中获取的参数，对整个实验过程中观察到的力平衡进行了满意的模拟。
Porous solid materials commonly undergo coating processes during their manufacture, where liquids are put in contact with solids for different purposes. The study of liquid penetration in porous substrates is a process of high relevance in activities in several industries. In particular, powder detergents are subject to coating with surfactants that will boost their performance, although this may affect the flowability and even cause caking of the particulate material, which can be detrimental to consumer acceptance. Here we present a methodology to make compacted preparations of powders relevant to detergent making and evaluate the internal structure of such porous substrates by means of X-ray microcomputed tomography. Liquid penetration in the preparation and the total mass uptake of fluid were monitored by a gravimetric technique based on a modified Wilhelmy plate method consisting of consecutive cycles. Taking into account the geometry of the system, two models were proposed to describe the liquid uptake based on the process being driven by mass (model 1) or pressure (model 2) gradients. A comparison between both from statistical and physical points of view led to the conclusion that the latter was more appropriate for describing the process and retrieving values of the permeability of the solid between 0.03 × 10-12 and 0.95 × 10-12 m2. Finally, with the parameters retrieved from model 2, the force balance observed throughout the experiment was simulated satisfactorily.