The pore wall structure of porous semi-crystalline anatase TiO2

Title
The pore wall structure of porous semi-crystalline anatase TiO2
Authors
김만호도정만한승철채근화유병용홍경태Andrew JacksonLowrence M. Anovitz
Keywords
Ultra Small Angle Neutron Scattering; Small Angle neutron Scattering; USANS; SANS; Cylindrical Pore; Anatase TiO2; titanium oxide; Neutron Contrast matching; Pore Wall; Diffusion boundary
Issue Date
2011-12
Publisher
Journal of applied crystallography
Citation
VOL 44, NO 6, 1238-1245
Abstract
The structure of porous TiO2 prepared by electrochemical anodization in a fluoride-containing ethylene glycol electrolyte solution was quantitatively studied using small-angle neutron scattering (SANS) and ultra-small-angle neutron scattering (USANS). The cylindrical pores along the coaxial direction were somewhat irregular in shape, were widely distributed in diameter, and seemed to have a broadly pseudo-hexagonal arrangement. The scattering from the pore wall showed a negative deviation from Porod scattering, indicating that the interface between TiO2 and the pore was not sharp. A density gradient of around 40–60 Å at the pore wall (i.e. the interface between the pore and the TiO2 matrix) was estimated using both constant and semi-sigmoidal interface models. This gradient may be due to the presence of fluorine and carbon partially absorbed by the pore wall from the fluoride-containing electrolyte and sorbed water molecules on the wall. The neutron contrast-matching point between the TiO2 matrix and the pores filled with liquid H2O/D2O mixtures was 51/49%(v/v) H2O/D2O, yielding an estimated mass density of 3.32 g cm-3. The specific surface area of the sample derived from the (U)SANS data was around 939–1003 ㎡ cm-3 (283–302 ㎡ g-1).
URI
http://pubs.kist.re.kr/handle/201004/40845
ISSN
0021-8898
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