Specific Heat Capacity of TiO₂ Nanoparticles

Abstract

We have calculated heat capacity of TiO 2 nanoparticles in three stable polymorphs by applying size and surface effects on heat capacity of the bulk structure. The size and surface corrections were imposed on the acoustic and optical bulk phonons, separately. The model used in the present work is a simple modification of the model proposed by Wang et al. We applied the modified model to obtain the specific heat capacity of 10-100 nm TiO 2 nanoparticles. A very good consistency is observed between the computational and experimental data. Based on the modified model, particles with sizes larger than 70 nm behave like bulk structure. In addition, the heat capacity of particles smaller than 15 nm become independent from their structure details while demonstrating a drastic increase.

Specific heat of metal oxide nanofluids at high concentrations for heat transfer

“…This behavior agrees with most reported studies about nanocrystalline materials when compared to bulk minerals [66,67], which attribute this feature to the surface energy, distortion and lattice energy of the nanoparticles [68,69]. Concerning nano-sized ZnO and ZrO 2 particles, they present lower experimental C p than bulk mineral with differences up to 13% [65] and 12% [63] for ZnO and 10% [63] and 18% [64] for ZrO 2 samples.…”

Influence of Various Geometrical Shapes on Mixed Convection Through an Open-Cell Aluminium Foam Filled with Nanofluid

“…[55][56][57][58][59][60][61][62][63][64][65][66][67][68][69][70][71][72]. In most cases, the quantum theory is necessary for describing the organization forms of matter.…”

Theoretical Evaluation of Thermal Properties of TiO2 Anatase and Rutile by using Einstein-Debye Approximation

“…The accurate evaluation problem of thermodynamic properties in various temperature ranges is extremely important for its application area to the conversion of heat into electric power [1,2]. In the studies dedicated to investigate the thermal properties of titanium dioxide, the various methods have been applied for the whole range of temperature [6][7][8][9][10][11][12][13][14]. Especially, in study [1], there are some significant numerical results of the isothermal bulk modules, heat capacities, entropy, thermal expansion coefficient and vibrational Helmholtz free energy for titanium dioxide.…”