Surface water and the origin of the positive excess specific heat for 7 nm rutile and anatase nanoparticles.
Specific heats (15-350 K) have been measured on 7 nm TiO2 anatase and rutile nanoparticles containing significant amounts of surface-adsorbed water. By successively reducing the water content without changing particle size, we observed two types of water behavior. The specific heat of bare 7 nm particles was estimated using the water specific heats. Contrary to previous literature reports, the bare small particle specific heats are the same as those of the bulk, within experimental error.
Boerio-Goates
Juliana
J
Department of Chemistry and Biochemistry, Brigham Young University, Provo, Utah 84602, USA. boerio-goates@byu.edu
Li
Guangshe
G
Li
Liping
L
Walker
Trent F
TF
Parry
Thomas
T
Woodfield
Brian F
BF
D000327:Adsorption; D004058:Diffusion; D008422:Materials Testing; D049329:Nanostructures / Q000032:analysis / Q000737:chemistry*; D010316:Particle Size; D013499:Surface Properties; D013696:Temperature; D013814:Thermal Conductivity; D014025:Titanium / Q000032:analysis / Q000737:chemistry*; D014867:Water / Q000737:chemistry*
D014867:Water; C009495:titanium dioxide; D014025:Titanium