Surface water and the origin of the positive excess specific heat for 7 nm rutile and anatase nanoparticles

Nano Lett. 2006 Apr;6(4):750-4. doi: 10.1021/nl0600169.

Abstract

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.

Publication types

  • Comparative Study
  • Evaluation Study
  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Adsorption
  • Diffusion
  • Materials Testing
  • Nanostructures / analysis
  • Nanostructures / chemistry*
  • Particle Size
  • Surface Properties
  • Temperature
  • Thermal Conductivity
  • Titanium / analysis
  • Titanium / chemistry*
  • Water / chemistry*

Substances

  • Water
  • titanium dioxide
  • Titanium