Comparison of Capillary Flow Porometry (CFP) and Liquid Extrusion Porometry (LEP) Techniques for the Characterization of Porous and Face Mask Membranes
Institut de la Filtration et des Techniques Séparatives (IFTS), Rue Marcel Pagnol, 47510 Foulayronnes, France
Departamento de Física Aplicada, ETSIIAA, University of Valladolid, 34071 Palencia, Spain
Surfaces and Porous Materials (SMAP), Institute of Sustainable Processes (ISP), Dr. Mergelina s/n, University of Valladolid, Valladolid 47071, Spain
Author to whom correspondence should be addressed.
Appl. Sci. 2020, 10(16), 5703; https://doi.org/10.3390/app10165703
Received: 12 July 2020 / Revised: 23 July 2020 / Accepted: 24 July 2020 / Published: 17 August 2020
(This article belongs to the Special Issue Preparation, Characterization and Modelling of Advanced Membranes)
This work aims to study the characterization of several membrane filters by using capillary flow porometry (CFP) and liquid extrusion porometry (LEP) to obtain their pore size distributions (PSD) and mean pore diameters (davg). Three polymeric membranes of different materials namely, polyethylene (PET), cellulose nitrate (CN), and FM (face mask), and one inorganic (namely, alumina Al2O3) from ultrafiltration (UF)/microfiltration (MF) and particle separation were analyzed using a pressure constant fluid/liquid extrusion porometer, developed at institute de la filtration et techniques séparatives (IFTS). Several porosimetric fluids have been used to wet and penetrate into the porous/fiber structure. The results show the accuracy of the setup on characterizing membranes in the UF/MF range by CFP, with reasonable agreement with nominal data of the filters. Additionally, LEP extension of the equipment obtained good agreement with nominal data and the CFP results, while filters presenting a microstructure of highly interconnected pores (face mask) resulted in clear differences in terms of resulting PSD and average sizes when CFP and LEP results are compared.