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Article
Photothermal investigations of phase transitions in liquid thermoelectrics
Two photothermal techniques, the photothermoelectric (PTE) and the photopyroelectric (PPE) were applied to detect first-order phase transitions in some liquid thermoelectric (LTE) material. Due to its large Se...
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Article
Photothermoelectric (PTE) Versus Photopyroelectric (PPE) Detection of Phase Transitions
The photopyroelectric (PPE) technique is one of the photothermal (PT) methods mostly used for phase transitions investigations. In this paper, we want to compare the PPE results with those obtained using anoth...
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Article
Photopyroelectric Calorimetry of \(\hbox {Fe}_{3}\hbox {O}_{4}\) Magnetic Nanofluids: Effect of Type of Surfactant and Magnetic Field
Five types of magnetic nanofluids, based on \(\hbox {Fe}_{3}\hbox {O}_{4}\) ...
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Article
Thermal Parameter Extraction of a Multilayered System by a Genetic Algorithm
Submicron multilayer systems are nowadays used in many common applications such as electronic systems, fuel cells, etc. A knowledge of the layer’s thermal properties are of main interest for thermal management...
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Article
Photopyroelectric calorimetry of solids
An alternative photopyroelectric (PPE) technique that combines the front detection configuration (FPPE) with the thermal wave resonator cavity (TWRC) method is proposed. The theoretical analysis of the FPPE si...
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Article
Thermal analysis of Polymer Dispersed Liquid Crystal under electric field using photopyroelectric technique
In this paper the first measurement of effective thermal parameters (thermal diffusivity, effusivity, conductivity and heat capacity) of Polymer Dispersed Liquid Crystal (PDLC) composites using the photopyroel...
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Article
Photopyroelectric measurement of thermal effusivity of liquids by sample's thickness scan
A method based on the sample's thickness scan of the amplitude of the photopyroelectric (PPE) signal is proposed as an alternative for thermal effusivity measurement of liquids. The proposed method uses a c...
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Article
Deux methodes photothermiques a l'etude d'une preparation de contact d'un melange binaire de cristaux liquides
The photopyroelectric (PPE) method is proposed as a sensitive technique to study a binary mixture of liquid crystals in a contact preparation. The photothermal signal is generated while scanning the contact pr...
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Article
Photopyroelectric investigation of binary mixtures of liquid crystals in contact preparations
The photopyroelectric (PPE) method is proposed as a sensitive technique to study a binary mixture of liquid crystals in a contact preparation. The photothermal signal is generated while scanning the contact pr...
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Article
Measurement of thermal diffusivity by the photoacoustic method
Analysis of the photoacoustic signalvs. the modulation frequency allows the determination of thermal diffusivity. Computer simulations have been carried out to determine the optimal conditions, in the case of rea...
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Chapter and Conference Paper
Analysis of Photothermal Sensitivity in the Detection of Phase Transitions
The photothermal signal sensitivity in detection of phase transitions is defined. The theoretical and experimental dependence of this sensitivity on frequency are investigated for two experimental configuratio...
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Chapter and Conference Paper
Anisotropic Thermal Diffusivity Measurements in a Discotic Liquid Crystal Using Photothermal Probe Beam Deflection
It is well known that the optical beam deflection technique (OBD) can be applied to measurements of thermal diffusivities of materials. Assuming that thermal transport properties in columnar discotic liquid cr...
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Chapter and Conference Paper
Optical Properties of Cholesteric Liquid Crystals by Photoacoustics
In a recent paper /1/, we have used the photoacoustic technique to study the second order smectic A-nematic phase transition in cyanobiphenyl liquid crystals. The aim of the present work is to detect selective...
