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A study of gas diffusion characteristics on a micro porous composite silica ceramic membrane.

Nwogu, Ngozi Claribelle; Kajama, Mohammed; Gobina, Edward


Ngozi Claribelle Nwogu

Mohammed Kajama

Edward Gobina


The purpose of this study is to investigate gas permeation behaviour of five gases (CO2, He, H2, N2 and Ar) across two silica modified ceramic membranes, Membrane Y and Membrane Z. An examination of the variations in their layer thickness and flow rate was determined. Solution-dip coating process was used for the modification process specifically for pore size reduction. This resulted in some level of modifications in the layer thickness after a successive dipping time as well as flow rate in relation to pressure drop. The effect of number of dips generally influenced the layer thickness of both membranes. Membrane Y layer thickness through five successive dipping was in the range of 89.2-36μm while Membrane Z ranges between 150.72 and 43.69μm. Gas permeability as a function of mean pressure for Membrane Z was calculated using data obtained experimentally. The permeation tests confirmed the contribution of both Knudsen and viscous flow mechanism with an estimation and prediction of the membrane pore radius.


NWOGU, N.C., KAJAMA, M. and GOBINA, E. 2015. A study of gas diffusion characteristics on a micro porous composite silica ceramic membrane. Composite structures [online], 134, pages 1044-1050. Available from:

Journal Article Type Article
Acceptance Date Aug 18, 2015
Online Publication Date Aug 18, 2015
Publication Date Dec 15, 2015
Deposit Date Feb 29, 2016
Publicly Available Date Aug 19, 2016
Journal Composite Structures
Print ISSN 0263-8223
Electronic ISSN 1879-1085
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 134
Pages 1044-1050
Keywords Ceramic membrane; Gas diffusion; Dip coating; Knudsen flow & viscous flow
Public URL


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