The Pads have unique values of thermophysical properties (THP) having important contribution over heat transfer into the PCB structure. Materials with high thermal diffusivity (TD) rapidly adjust their temperature to that of their surroundings, because the HT is quick in compare to their volumetric heat capacity (VHC). In the paper is presenting the diffusivity tests (ASTM E1461 flash method) f...

Vibrational cooling rate of the first excited singlet (S(1)) state of trans-stilbene and bulk thermal diffusivity are measured for seven room temperature ionic liquids, C(2)mimTf(2)N, C(4)mimTf(2)N, C(4)mimPF(6), C(5)mimTf(2)N, C(6)mimTf(2)N, C(8)mimTf(2)N, and bmpyTf(2)N. Vibrational cooling rate measured with picosecond time-resolved Raman spectroscopy reflects solute-solvent and solvent-solv...

The thermal diffusivity of Teflon, sodium chloride, quartz, and silica glass was measured at 40øC to pressures of 35, 18, 30, and 36 kbar, respectively. A transient line source method was modified for use in a piston-cylinder high-pressure c ll. Pressure gradients were determined by experiments with bismuth foils. The pressure dependence of the thermal diffusivity at 40øC for the substances stu...

Abstract Effective thermal diffusivity models are useful for predicting diffusivities of heterogeneous materials. The literature contains that may be broadly categorised into four different types: (1) effective highly specific applications (e.g. empirical curve fitting measured data); (2) as a weighted averages the components’ and volume fractions; (3) calculated from conductivity, density heat...

In this paper, anatase titanium dioxide (TiO2) thin films 60 lm thick are fabricated using the electrospinning technique. The prepared thin films are composed of interconnected anatase TiO2 nanofibers. The transient electro-thermal technique, combined with a temperature–resistance calibration procedure, provides a full spectrum study which examines the relationship between the film’s thermal di...

Recent studies have shown that the Cu/cap layer interface is the dominant diffusion path for electromigration (EM) in Cu interconnects, making it important to develop effective methods to evaluate the effect of passivation layer on interfacial mass transport and EM lifetime for Cu interconnects. This work shows that a set of isothermal stress relaxation tests together with appropriate modeling ...

The photothermal beam deflection (PDS) technique was tested for low thermal diffusivity materials. The effect of using different liquids as surrounding media was studied in a systematic way. The fundamental experimental parameters, like the pump beam power and the modulation frequency were also studied in order to find out the best combination that still allows us to get good signals. Due to th...

This work reports on the first time study of thermal transport in the axial direction of single silkworm silks. The measured thermal diffusivity of relaxed silkworm silk and thermal conductivity are 0.39 10 6 to 2.03 10 6 m s 1 and 0.54–6.53Wm 1 K , respectively. The thermal diffusivity of silkworm silk increases up to 263% upon elongation up to 63.8%. For one of the samples studied (sample 5),...

In this paper we report the use of photothermal techniques such as Thermal lens (TL) spectrometry, Photoacoustic and heat capacity, rcp, to determine the thermo-optical parameters, such as thermal conductivity (K), thermal diffusivity (D), specific heat (cp) and the optical path dependence with temperature (ds/dT), of an undoped polycrystalline 3C-SiC. To our knowledge, this is the first time t...