Fabrication and Optical Modeling of Micro‐Porous Membranes Index‐Matched with Water for On‐Line Sensing Applications,Macromolecular Materials and Engineering

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Fabrication and Optical Modeling of Micro‐Porous Membranes Index‐Matched with Water for On‐Line Sensing Applications
Macromolecular Materials and Engineering ( IF 4.2 ) Pub Date : 2020-02-20 , DOI: 10.1002/mame.201900701
Roberta Lanfranco ₁ , Fabio Giavazzi ₁ , Tommaso Bellini ₁ , Emanuele Di Nicolò ₂ , Marco Buscaglia ₁

Affiliation

Membranes made of perfluorinated materials having a refractive index close to that of water enable straightforward detection of water solutes at the interface, hence providing a novel sensing tool for fluidic systems. Here it is reported the production by non‐solvent induced phase separation and characterization of microporous membranes made of Hyflon AD, an amorphous copolymer of tetrafluoroethylene. Their optical turbidity when soaked in liquids having different refractive indices is studied and the data are interpreted with an optical model linking scattered light and structural features of the membrane. The average polymer and pore chord lengths obtained in this way scale with the filtering pore size measured by capillary flow porometry. Then, the optical response of the membranes when soaked in aqueous surfactant solutions is investigated and the effects of the molecular adsorption on the internal membrane surface is successfully interpreted by an extension of the model. Overall, the results show that index‐matched membranes can be designed and produced to provide a simple optical detection of the composition of the soaking liquid or to monitor the initial stage of membrane fouling.

中文翻译：

在线检测应用中与水匹配的微孔膜的制备和光学建模

由全氟材料制成的膜具有接近水的折射率，因此能够直接检测界面处的水溶质，因此为流体系统提供了一种新颖的传感工具。此处报道了通过非溶剂诱导的相分离生产和表征由Hyflon AD（一种四氟乙烯的无定形共聚物）制成的微孔膜。研究了它们在不同折射率的液体中浸泡时的光学浊度，并通过将散射光与膜的结构特征联系在一起的光学模型解释了数据。以这种方式获得的平均聚合物和孔弦长度与通过毛细管流孔法测量的过滤孔径成比例。然后，研究了浸泡在表面活性剂水溶液中时膜的光学响应，并通过模型扩展成功地解释了分子吸附在膜内部表面上的作用。总体而言，结果表明，可以设计和生产折射率匹配的膜，以便对浸泡液的组成进行简单的光学检测，或监测膜结垢的初始阶段。

更新日期：2020-03-12

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