Page 483 - Book Hosokawa Nanoparticle Technology Handbook

8 DEVELOPMENT AND MULTI-FUNCTIONALIZATION OF HIGH-FUNCTIONAL SEPARATION MEMBRANES APPLICATIONS
about five times higher than even an unachieved organic silicon compounds with conductive functional
helium permeability when a conventional molecular groups to the inside of pores and the surface of porous
sieving function was used (Fig. 8.3). glass (Fig. 8.4). As a result, development work is now
Translucent porous glass with fine pore diameters being carried out to produce membranes expected to
controlled to the nanometer scale is used for separation provide new solid electrolytic membranes. The new
membranes and catalysts, due to its characteristics. membranes have the heat resistant, anti-organic
Kuraoka et al. [6] produced inorganic–organic solvent and anti-swelling properties of glass medium.
hybrid solid electrolytic membranes by introducing In addition to these properties, the new membranes
have high conductivity thanks to conductive functional
Ar CO groups, and also being usable under severe conditions
He H 2 CO 2 N 2 CH 4 where conventional solid electrolytic membranes can-
not be used.
10 -6 A remarkable increase in the contact area of
photocatalyst materials and decomposed materials
can be achieved by loading and foaming materials
with photocatalystic functions in the pores of
Improvement of hydrogen
Permeability (mol/m 2 • s • Pa) 10 -8 system also facilitates very efficient decomposition.
porous glass membranes without hindering
-7
10
permeability
translucency (Fig. 8.5). The membrane permeation
Studies are being carried out on this type of high-
functional membranes with extremely high photo-
oxidation functions [7].
Various studies have also been conducted on gas
nanohybrid membranes [8–10]. Gomes et al. [8] pro-
-9
10
duced nano-hybrid membranes by sol–gel copolymer-
Conventional molecular sieving function separation membranes using inorganic–organic
ization by adding various organic alkoxysilane and
tetraethoxysilane to a tetrahydrofuran solution of
10 -10 PTMSP (Poly (1-trimethylsilyl-1-propyne)) and eval-
0.2 0.3 0.4 uated the permeability and selectivity of the mem-
Molecular diameter (nm) branes. As a result, they found that the conversion rate
of silica in the membranes was high and that both the
Figure 8.3 permeability of butane and the butane/methane selec-
Characteristics of highly selective hydrogen separation tivity were simultaneously high when the diameter of
membrane. particles was 20–40 nm.

Proposal Conventional
Light Light
photocatalyst photocatalyst

Glass Plate
Porous Glass Plate
Surface Area 60,000 : 1
2
2
30m /g (1mm thick) 5cm /g (1mm thick)
ineffective
Condensation extremely effective
Figure 8.4
Characteristics of porous glass plate supported by photocatalyst.

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