We report on the thermal conductivity measurement of Ge quantum dot superlattices. The samples used were grown using molecular beam epitaxy. The typical dot sizes were determined by transmission electron microscopy measurements to be 75 nm in base and 7 nm in height. A differential 3o method was employed to characterize the thermal conductivity of the samples. At room temperature, thermal condu...

nanofluids are gaining much importance over the past decade due to their enhanced thermal conductivity, specific heat, cooling capacity, electrical conductivities. novel properties of nanofluids are yet to be explored to the highest potential applications. one of the prominent applications of nanofluids is in thermal conduction. the presence of nanoparticle in a fluid can enhance the thermal co...

Interatomic potentials, which describe interactions between elements of nanosystems, are crucial in theoretical study of their physical properties. We focus on two well known empirical potentials, i.e. Tersoff's and Brenner's potentials, and compare their performance in calculation of thermal transport in carbon nanotubes. In this way, we study the temperature and diameter dependence of thermal...

Very large thermal conductivity enhancement had been reported earlier in colloidal suspensions of solid nanoparticles (i.e., nanofluids) and more recently also in oil-in-water emulsions. In this study, nanoemulsions of alcohol and polyalphaolefin (PAO) are spontaneously generated by self-assembly, and their thermal conductivity and viscosity are investigated experimentally. Alcohol and PAO have...

Longitudinal heat conduction is an important parameter in the cryogenic field, especially in cryogenic heat exchangers. In the present work, the parasitic effect of tube wall longitudinal heat conduction on temperature measurement has been studied in cryogenic laminar hydrogen flow. The effects of various parameters such as wall cold end temperature, wall thermal conductivity, gas volumetric fl...

We report the measurement of the thermal conductivity of a suspended single-layer graphene. The room temperature values of the thermal conductivity in the range approximately (4.84+/-0.44)x10(3) to (5.30+/-0.48)x10(3) W/mK were extracted for a single-layer graphene from the dependence of the Raman G peak frequency on the excitation laser power and independently measured G peak temperature coeff...

Frequency-domain thermoreflectance is extended to the characterization of thin metals films on low thermal diffusivity substrates. We show how a single noncontact measurement can yield both the thickness and thermal conductivity of a thin metal film with high accuracy. Results are presented from measurements of gold and aluminum films 20–100 nm thick on fused silica substrate. The thickness mea...

this work presents a model for calculating the effective ‎thermal conductivity of nanofluids. the proposed model ‎includes the effects of nanoparticles and thermal conductivity ‎base fluid.we will focus on experimental of the volume ‎concentration parameter and temperature on thermal ‎conductivity, nano-fluid combination and multi-walled ‎carbon nanotubes-oxide / copper-paid deionized water. th...

The Thermal Diffusion Probe 200 (TDP200) is a thermal properties characterization device that is capable of measuring the thermal conductivity of phantom materials with less than 0.2% variability. However, this device gives 1.5% to 2% variability in thermal conductivity values when the medium being measured is human skin tissue. Six different sources of variability have been identified that mig...