The thermal conductivity of SiO2 thin films prepared using various procedures has been studied using a 3ω method. The thermal conductivity of SiO2 thin films of above approximately 500 nm thickness decreases as the porosity of the specimen, which is determined by infrared absorption spectroscopy, increases. Below approximately 250 nm thickness, the observed thermal conductivity of the SiO2 thin films systematically decreases as a function of film thickness. The data have been analyzed based on a SiO2-thickness-independent thermal conductivity and interfacial resistance. The total estimated interfacial resistance between the metal strip and the film, and between the film and the substrate is about 2×10−8 m2 KW−1.

Articles you may be interested inAnalysis of thermal diffusivity of Ti thin film by thermoreflectance and periodic heating technique Rev. Sci. Instrum. 82, 034905 (2011); 10.1063/1.3557389 Analysis of thermoreflectance signals and characterization of thermal conductivity of metal thin films Rev. Sci. Instrum. 80, 124901 (2009); 10.1063/1.3265994 Morphology and interdiffusion behavior of evaporated metal films on crystalline diindenoperylene thin films J. Appl. Phys. 93, 5201 (2003); 10.1063/1.1556180 Thermal wave studies of thin metal films and structures AIP Conf.Thermal diffusivity measurements of sub-micron organic dye thin films using a high temperature superconductor bolometer Appl.

Vapor pressures for 50 hydrofluoroethers have been measured from pressures of less than 30 kPa to 101.3 kPa. Measurements were made by the isoteniscope method. The Antoine constants for each compound were derived using the experimental data.

Analysis of ac temperature wave during the measurement of thermal diffusivity of twolayered platelike samples An ac calorimetric method is applied to the direct measurement of thermal diffusivity of single fibers. Theoretical analysis is presented, taking into account the two-dimensional ac thermal wave for cylindrical systems and the effect of time delay at the temperature detecting system. Experimental tests are performed using nickel and stainless steel wires about 20 m in diameter. The thermal conductivity of fibers about 10 m in diameter of the advanced materials, polyacrylonitrile-based carbon, TORAYCA, and aramide, Kevlar, is determined. The relationship between the thermal conductivity and electric conductivity and the crystalline size of these fibers is discussed. For composite materials made of carbon fibers, the observed thermal conductivity agrees with the thermal conductivity estimated using the values determined by the present method.

Articles you may be interested inMeasurement of thermal diffusivities of thin metallic films using the ac calorimetric method Measurement of thermal diffusivity parallel to the surface of platelike specimen by the laser pulse heating method Rev.Thermal diffusivity measurement of single fibers by an ac calorimetric method Analysis of ac temperature wave during the measurement of thermal diffusivity of twolayered platelike samples