1. Membrane Permeance (mol/s.m2.Pa)
Synthesis and Diffusion Properties of Ordered Nanoporous Silica Membranes with Controlled Macroscopic Morphology Jerry Y.S. Lin, Dept of Chemical Engineering, Arizona State University, Tempe, AZ 85260
Oxygen permeance of CDSA silica membranes (at 298 K)
Silicon source
Method
Pore size
(µm)
Membrane Permeance (mol/s.m2.Pa)
Support*
As-synthesized
Method A
(H>>>h) 8
1.2 ×10-4
4.27x10-6
Method B (H>h)
7.35x10-6
Method C
(H=h)
1.2×10-4
5.68x10- 6
Support
Acidified Water + Surfactant
Silica grown inside the support pores in
Methods A, B and C
Permeance decreases by about 100 times after
growth of silica with surfactant
SEM shows plug morphology is typical of
MCM-41 fibers
XRD shows ordered pattern for Method B and
Method C
* Theoretical
support
As-synthesized
silica plug