TY - JOUR
T1 - Energetics of nanocrystalline TiO2
AU - Ranade, M. R.
AU - Navrotsky, A.
AU - Zhang, H. Z.
AU - Banfield, J. F.
AU - Elder, S. H.
AU - Zaban, A.
AU - Borse, P. H.
AU - Kulkarni, S. K.
AU - Doran, G. S.
AU - Whitfield, H. J.
PY - 2002/4/30
Y1 - 2002/4/30
N2 - The energetics of the TiO2 polymorphs (rutile, anatase, and brookite) were studied by high temperature oxide melt drop solution calorimetry. Relative to bulk rutile, bulk brookite is 0.71 ± 0.38 kJ/mol (6) and bulk anatase is 2.61 ± 0.41 kJ/mol higher in enthalpy. The surface enthalpies of rutile, brookite, and anatase are 2.2 ± 0.2 J/m2, 1.0 ± 0.2 J/m2, and 0.4 ± 0.1 J/m2, respectively. The closely balanced energetics directly confirm the crossover in stability of nanophase polymorphs inferred by Zhang and Banfield (7). An amorphous sample with surface area of 34,600 m2/mol is 24.25 ± 0.88 kJ/mol higher in enthalpy than bulk rutile.
AB - The energetics of the TiO2 polymorphs (rutile, anatase, and brookite) were studied by high temperature oxide melt drop solution calorimetry. Relative to bulk rutile, bulk brookite is 0.71 ± 0.38 kJ/mol (6) and bulk anatase is 2.61 ± 0.41 kJ/mol higher in enthalpy. The surface enthalpies of rutile, brookite, and anatase are 2.2 ± 0.2 J/m2, 1.0 ± 0.2 J/m2, and 0.4 ± 0.1 J/m2, respectively. The closely balanced energetics directly confirm the crossover in stability of nanophase polymorphs inferred by Zhang and Banfield (7). An amorphous sample with surface area of 34,600 m2/mol is 24.25 ± 0.88 kJ/mol higher in enthalpy than bulk rutile.
UR - http://www.scopus.com/inward/record.url?scp=0347895525&partnerID=8YFLogxK
U2 - 10.1073/pnas.251534898
DO - 10.1073/pnas.251534898
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AN - SCOPUS:0347895525
SN - 0027-8424
VL - 99
SP - 6476
EP - 6481
JO - Proceedings of the National Academy of Sciences of the United States of America
JF - Proceedings of the National Academy of Sciences of the United States of America
IS - SUPPL. 2
ER -