Fundamentals of membrane top-layer synthesis and processing

A. J. Burggraaf*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingChapterAcademicpeer-review

15 Citations (Scopus)

Abstract

This chapter discusses the fundamentals of membrane top-layer synthesis and processing. Mesoporous, asymmetric multilayer membranes with graded pore diameters can be produced on macroporous alumina or carbon substrates of different shapes. Ceramic membrane production obtains defect-free supported films with homogeneous thickness and a narrow pore-size distribution. The chapter summarizes the basic elements of drying theory relevant to stress formation and related defect formation. To obtain defect-free separation films, the use of support systems of good quality (low roughness, reasonable pore size distribution without too large pores, reproducible wettability) is necessary and multiple dipping procedures are required. The drying process is important and becomes critical with small mesopore systems because of large tensile stresses that build up in the membrane layers. The chapter describes techniques for the measurement of these stresses and includes theoretical and model descriptions for stress and crack development with illustrative examples. Stress levels and membrane cracking can be decreased by applying low controlled drying rates and using organic additions. To obtain membranes on large surface areas and/or on complex support shapes, further optimization of the process is necessary. The chapter discusses the thickness of the formation of a lyogel film with reference to the development of its thickness.
Original languageEnglish
Title of host publicationFundamentals of Inorganic Membrane Science and Technology
EditorsA.J. Burggraaf, L. Cot
PublisherElsevier
Chapter8
Pages259-329
Number of pages71
ISBN (Print)978-0-444-81877-5
DOIs
Publication statusPublished - 1 Dec 1996

Publication series

NameMembrane Science and Technology
PublisherElsevier
Volume4
ISSN (Print)0927-5193

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