SANS & USANS study on the structures of pore walls of porous materials
- SANS & USANS study on the structures of pore walls of porous materials
- 김만호; 도정만; 채근화; 유병용
- Porous Materials; Pore wall; Small angle Neutron scattering; Ultra small angle neutron scattering; SANS; USANS; porous TiO2
- Issue Date
- 5th International Symposium on Practical Surface Analysis (PSA-10)
- Small angle and ultra small angle neutron scattering (SANS and USANS) techniques are useful
for studying the physical structure and morphology from nanometer to micrometer. Especially, the interface
structure can be investigated using the small angle scattering technique. "A material system consisting of
more than one phase with different densities has a contact surface along the interface boundary" . The
interface boundary exists in any two phase systems; phase-separated blends, filler-matrix in composites, pore
wall in porous materials, mixtures of particles and liquid, proton conducting channel in polyelectrolyte fuel
cell membrane, semi-crystalline system consisting of amorphous and crystalline phase, vapor adsorbed
interface, and so on. The interfacial region can be characterized in three ways using the small angle
scattering: sharp interface, diffused interface, and fractals. In this presentation, our previous SANS and
USANS study  on the bi-continuous porous glass, Vycor, showing the fractal surface, will be introduced.
In addition, the preliminary characterization on the pore wall of the porous TiO2 prepared with an
anodization process  using the SANS will be presented. The scattering from the pore wall of TiO2 showed
a negative deviation from Porod's law, which indicates that the interface is not sharp but diffused. The
thickness of the interface and the surface-to-volume ratio are estimated from the modified Porod's law using
the linear and semi-gradient model . The SANS and USANS contrast matching technique for estimating
the mass density is briefly introduced.
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- KIST Publication > Conference Paper
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