Thermal diffusivity measurements in benzophenone crystals using photoacoustic techniques

Bonno, B.; Laporte, J. L.; Rousset, Y.

doi:10.1063/1.346094

Cited by 19 publications

(9 citation statements)

References 11 publications

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“…The slope of the In (SRf) vs. f~2 plot can give the thermal diffusivity of a sample under rear surface illumination. The technique has been used [31] to calculate as of benzophenone at several background temperatures in the range 118 K-293 K. Although no literature thermal data existed for benzophenone, other than its room temperature value, 1.8.10 -3 cm2/s, the authors found reasonable agreement with the temperature-dependent diffusivity values reported in the literature for other organic solids. In a thorough rear surface illumination study of thin copper film (40-60/~m thickness range), Hashimoto et al [32] measured the diffusivity of the thin films, while at the same time they observed a sound wave interference effect in the PA cell.…”

Section: C) Alternate Fd Photoacoustic Detection Schemessupporting

confidence: 63%

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Photothermal applications to the thermal analysis of solids

Mandelis

1991

Journal of Thermal Analysis

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Major application of optically-induced thermal waves to the thermal and thermodynamic analysis of solids are reviewed. The spectrum of available techniques,from the conventional photoaeoustic detection to novel photothermal laser probing and frequency multiplexing is discussed, and their utilization for the measurement of thermophysical thermal transport-related parameters of solids is presented. These include the thermal diffusivity, effusivity, conductivity and specific heat. The ability of photothermal methods to perform thermal analysis on large classes of solids, including conducting and insulating bulk materials, crystals, layered porous and coated structures, thin films and inhomogeneous thermal profiles is highlighted. Finally, special capabilities of photothermal analysis, such as the monitoring of surface thermodynamic phenomena and phase transition studies, including high-Tc superconductors, are described in order to give a complete overview of the rich potential of photothermal-based methodologies.Exposure of a sample to radiation results in local heating due to absorption and subsequent thermalization of the incident radiation. The extent of absorption and the thermalized volume fraction depend on the interplay between the absorption profile and the thermal transport properties of the material under investigation. If the irradianee of the incident radiation is modulated harmonically or pulsed, an oscillatory or transient heat source, respectively, is generated in the sample. Thermal waves are thus created,

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Section: C) Alternate Fd Photoacoustic Detection Schemessupporting

confidence: 63%

“…In that geometry, the photoacoustically saturated, thermally thick regime [7] (i.e.ls > >/~s (f))signal is given by the very simple expression. [31]:…”

Section: C) Alternate Fd Photoacoustic Detection Schemesmentioning

confidence: 98%

Photothermal applications to the thermal analysis of solids

Mandelis

1991

Journal of Thermal Analysis

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“…In our case, we are using the "transmission" configuration where the sample is in contact with the window and the microphone is connected to the gas colwnn behind the sample. For this case the explicit formula for Q could either be obtained by following the steps of Rosencwaig modified to our case or following the Green's function formula employed by Bono et al, [3]. We found both expressions result in the following : , is the…”

Section: Introduction and Theoretical Backgroundmentioning

confidence: 96%

“…The graphs for the variation of y Photoacoustic Typical graphs of phase Lag ( y ) versus for 0 pure-, x lOI7 ndoped, 0 1018ndoped, 1020 pdoped.with the frequency of the modulation are shown inFig. (2)and(3) for the two types of doping GaAs samples used (all our samples have the same thickness of 1.00 mm).…”

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confidence: 99%

Determination of thermal parameters of semiconductors by photoacoustic phase angle technique

Negm¹,

Talaat²

1993

1993 Proceedings IEEE Ultrasonics Symposium

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“…(b). In this case, the PA signal amplitude of optically opaque and thermally thick sample is given by …”

Section: Introductionmentioning

confidence: 99%

Thermal properties stability of UV irradiated PVA nanohybrid composites

El‐Brolossy

Saber

2012

Polymers for Advanced Techs

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Zn-Al-salicylic nanohybrid layers have been prepared and used as fillers for polyvinyl alcohol (PVA). Nanohybrid layers of a broad absorption area in UV region were completely and uniformly dispersed in a continuous polymer matrix. PVA and PVA nanohybrid composite (NHC) films were exposed to UV irradiation. Thermal properties (diffusivity, effusivity, and conductivity) of both have been measured through photoacoustic technique before and after UV irradiation. Thermal parameters of PVA suffered from a quick deterioration with UV exposure due to reduction of the phonon mean free path as a result of molecular chain scissions. However, significant stability in such parameters of NHC has been obtained under the influence of UV irradiation. This thermal properties stability may be an important step on the way of obtaining photostable polymer NHC.

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Thermal diffusivity measurements in benzophenone crystals using photoacoustic techniques

Cited by 19 publications

References 11 publications

Photothermal applications to the thermal analysis of solids

Photothermal applications to the thermal analysis of solids

Determination of thermal parameters of semiconductors by photoacoustic phase angle technique

Thermal properties stability of UV irradiated PVA nanohybrid composites

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