Open Photoacoustic Cell Configuration Applied to the Thermal Characterization of Liquid CdS Nanocomposites

Abstract

CdS nanofluids were prepared by the gamma-radiation method at different radiation doses. The samples were characterized by UV-Vis spectroscopy and transmission electron microscopy. The open cell photoacoustic technique was used to measure the thermal effusivity of the CdS nanocomposites. In this technique a He-Ne laser was used as the excitation source and was operated at 632.8 nm with an output power of 70 mW. The precision and accuracy of this technique were initially established by measuring the thermal effusivity of distilled water and ethylene glycol. The thermal-effusivity values of these two samples were found to be close to the values reported in the literature. The thermal effusivity of CdS nanofluids decreased from (0.453 to 0.268) W • S 1/2 • cm −2 • K −1 with increased dosage of gamma radiation.

Structural, optical, opto-thermal and thermal properties of ZnS–PVA nanofluids synthesized through a radiolytic approach

“…The thermal effusivity of samples was measured by a photo-acoustic technique based on Rosencwaig–Gersho theory [ 36 ]. The experimental and theoretical fitting of this method were comprehensively explained in our previous work [ 37 ].…”

Photoacoustic signal with two heating sources: theoretical predictions and experimental results for the open photoacoustic cell technique

“…Several techniques exist for determining the thermal diffusivity. The open photoacoustic cell technique (OPC) is widely used [3,4,[8][9][10][11][12][13][14][15][16][17][18][19][20][21], due to its simplicity and low-cost assembly, since the photoacoustic cell is the air cavity of the microphone [22], besides of the sample does not require rigorous preparation. Most theoretical models that describe the PA signal in OPC technique incorporate several physical phenomena, such as thermal diffusion (TD), [8,23] thermal expansion [24], thermoelastic bending (TE), [8,25,26] photobaric effect [27], and plasma waves [28][29][30][31].…”

Thermal Characteristics of PVA-PANI-ZnS Nanocomposite Film Synthesized by Gamma Irradiation Method

“…[4,5] The polymeric nanocomposites of semiconductor particles have interesting thermal, optical and electronic applications. [6,7] Nanocomposites consisting of organic polymers and inorganic nanoparticles in a nanoscale regime represent a novel class of materials that have motivated considerable interests in recent years. [6,8,9] Conducting polymers have unique potential for applications in different fields due to their exciting properties like low cost, environmental stability, light weight, conductivity and mechanical flexibility.…”