Article
Biochemistry & Molecular Biology
V. D. Sabino, Y. R. Suarez, L. H. C. Andrade, S. M. Lima, G. R. Morais, F. B. Guimaraes, A. C. Bento, M. L. Baesso, J. R. Silva
Summary: The thermal diffusivity (D) of Astyanax lacustris fish scale was measured using a photoacoustic method, showing that D values can differentiate among different basins, indicating its dependence on scale thickness and water conductivity.
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY
(2022)
Article
Physics, Applied
Katarina Lj. Djordjevic, Dragana K. K. Markushev, Slobodanka P. P. Galovic, Dragan D. D. Markushev, Jose Ordonez-Miranda
Summary: The effect of sample radius on the prediction accuracy of neural networks trained with undistorted and distorted signals is analyzed in this study. It is found that the networks trained with both undistorted and distorted signals perform best for sample radii between 2 and 3 mm, close to the microphone aperture radius of 1.5 mm. For sample radii comparable to the microphone dimensions, the network trained only with undistorted signals gives the best results. These findings highlight the importance of using slightly larger samples than the microphone aperture in experiments.
JOURNAL OF APPLIED PHYSICS
(2022)
Article
Physics, Applied
Zdravko Stanimirovic, Ivanka Stanimirovic, Slobodanka Galovic, Katarina Djordjevic, Edin Suljovrujic
Summary: In modern high-speed semiconductor electronics, the heating of components is influenced by rapid relaxation processes. Understanding the relaxation times of these processes is important for thermal management of these devices. Photoacoustic techniques have been developed and used successfully for investigating physical semiconductor properties. A model of pulse photoacoustic signal is proposed to observe fast relaxation processes in a thin semiconductor layer by adjusting the frequency and duty cycle of the pulse train.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Engineering, Mechanical
Minarul Sarkar, Madan M. Upadhyay, Kaushal Kumar
Summary: Photoacoustic spectroscopy (PAS) is an important technique for material characterization. In this study, the authors fabricated a photoacoustic cell and conducted parametric studies to optimize the signal sensitivity. They found that the optimum signal was achieved with a cavity volume of 1.763 x 10(-6) m(3). The thermal diffusivity of hummers method synthesized graphene oxide (GO) powder was measured using laser excitation at 980 nm and found to be (1.84 +/- 0.10) x 10(-4) m(2)/s. Additionally, the thermal diffusivity of the same sample was measured using different excitation wavelengths and no significant change was observed, indicating that thermal diffusivity is independent of excitation wavelength. Finally, the authors measured the photoacoustic spectrum of the GO sample in the 400-1200 nm range and compared it with the spectrum of lamp black.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE
(2022)
Article
Thermodynamics
M. Kirpluks, J. Andersons, J. Modniks
Summary: This study proposes a method to estimate the diffusivity of gases by experimentally determined evolution of PU foam conductivity, and evaluates the permeability of PU polymer further. This method has the ability to predict the aging dynamics of PU foams with different morphologies.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2022)
Article
Thermodynamics
M. R. Mohebbifar, M. Almasi
Summary: In this study, pump-probe thermal lens spectroscopy was used to investigate the thermal behavior and molecular interactions in binary liquid mixtures of acetone and 1-alkanol. The experimental results showed that increasing the carbon chain length of alcohols decreases their tendency to interact with acetone.
INTERNATIONAL COMMUNICATIONS IN HEAT AND MASS TRANSFER
(2021)
Article
Acoustics
K. Herrmann, N. W. Pech-May, M. Retsch
Summary: The photoacoustic measurement technique is a powerful method for characterizing thermal transport properties of thin films, particularly in isotropic low thermal diffusivity samples. Significant influence of thermal effusivity, thermal diffusivity, and sample layer thickness on the measurement accuracy is discussed. The method allows for direct extraction of thermal conductivity without separate determination of heat capacity when appropriate boundary conditions are met.
Article
Physics, Applied
S. P. Galovic, K. L. J. Djordjevic, M. V. Nesic, M. N. Popovic, D. D. Markushev, D. K. Markushev, D. M. Todorovic
Summary: This paper derives a model for the photoacoustic gas-microphone signal recorded in a transmission configuration using a minimum volume cell in the time domain. The model considers the inertial thermal relaxations of both the sample and the gas in the cell using the theory of heat conduction. By introducing an electro-thermal analogy for thin samples and short microphone cavity, characteristic quantities are defined for solving the inverse problem in time-domain photoacoustic. The derived model, which includes thermal relaxation, explains the experimentally observed overshoots, undershoots, and oscillatory approach to steady values in high-resolution time-domain photoacoustic measurements of thin semiconductor membranes, which will be presented in detail in a subsequent paper.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Construction & Building Technology
J. Andersons, J. Modniks, M. Kirpluks
Summary: This study proposes an alternative method of estimating the effective diffusivities of gases in PU foams based on experimentally determined evolution of foam conductivity. Compared to traditional methods, this approach provides more accurate estimates of the diffusion coefficients for PBAs in PU foams.
JOURNAL OF BUILDING ENGINEERING
(2021)
Article
Optics
Chunqi Zheng, Huanzheng Zhu, Ziquan Xu, Ravindra K. Sinha, Qiang Li, Pintu Ghosh
Summary: A three-layer ultrathin film containing PDMS layer and chromium films is proposed for high optical absorption efficiency, with the ability to modulate absorption characteristics by varying the PDMS layer thickness. The PA signal generated by this film structure is stronger compared to single Cr and Au films.
Article
Chemistry, Multidisciplinary
Petr K. Krivoshein, Dmitry S. Volkov, Olga B. Rogova, Mikhail A. Proskurnin
Summary: This study used FTIR-photoacoustic spectroscopy (FTIR-PAS) supported by attenuated-total reflection FTIR spectroscopy (ATR-FTIR) to fractionate soils into different aggregate fractions (10-5000 μm) and compare their properties. The results showed differences in the composition of chernozem and sod-podzolic soils and different agricultural-use chernozem samples, with the range of 10-100 μm providing the most information. Changes were observed in the soil organic matter range (1900-1340 cm(-1)) and the soil-matrix region (550-300 cm(-1)). The fractionation showed more differences in the sod-podzolic and chernozem soil fractions than the whole soil spectra, with FTIR-PAS being more sensitive in the 4000-2000 cm(-1) region and ATR-FTIR being more sensitive in the 2000-100 cm(-1) region.
Article
Thermodynamics
Sobhan Erfantalab, Giacinta Parish, Adrian Keating
Summary: The thermal transport properties of low thermal conductivity porous silicon thin films attached to high thermal conductivity silicon substrates were studied using the 3 omega method. The extracted thermal properties showed a reduction in thermal conductivity and diffusivity as the porosity of the films increased. After passivation, the films exhibited higher values of thermal conductivity and diffusivity. The ability to extract both thermal conductivity and thermal diffusivity for these films removes the need to make assumptions around specific heat capacity.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2022)
Article
Optics
Jisha John, Achamma Kurian, Sajan D. George
Summary: The study investigates the variation in the thermal properties of dye-plasmonic nanoparticle mixtures upon the addition of Hg2+ ions using laser-based techniques. The absorption peak wavelength and spectrum shape are found to be sensitive to the presence of Hg2+ ions, leading to changes in the thermal diffusivity values. Additionally, the study reveals that divalent metal ions are more efficient in altering the thermal and optical properties of the mixtures.
Article
Engineering, Multidisciplinary
K. Lj. Djordjevic, S. P. Galovic, M. N. Popovic, M. V. Nesic, I. P. Stanimirovic, Z. I. Stanimirovic, D. D. Markushev
Summary: The paper presents a methodology using neural networks for the precise and reliable determination of thermal diffusivity and linear coefficient of thermal expansion. By training and optimizing the neural networks on numerical experiments, the proposed method achieves high precision in the measurement of thermoelastic and geometrical properties of the sample based on the recorded photoacoustic signal.
Article
Chemistry, Physical
Inmaculada Canadas, Victor M. Candelario, Giulia De Aloysio, Jesus Fernandez, Luca Laghi, Santiago Cuesta-Lopez, Yang Chen, T. James Marrow, Antonio Rinaldi, Ana Mariblanca Sanchez, Angelo Tati, Claudio Testani
Summary: The study found that the thermal properties of porous silicon carbide are affected by the severity of thermal aging conditions, with thermal diffusivity decreasing by up to 10% and specific heat decreasing by up to 5%.
Article
Chemistry, Multidisciplinary
Syuhada Abu Bakar, Elias Saion, Afarin Bahrami, Nayereh Soltani, Mohammad Reza Zare
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2019)
Article
Physics, Multidisciplinary
A. Kamalianfar, S. A. Halim, Mahmoud Godarz Naseri, M. Navasery, Fasih Ud Din, J. A. M. Zahedi, Kasra Behzad, K. P. Lim, A. Lavari Monghadam, S. K. Chen
Article
Thermodynamics
Nastaran Faraji, W. Mahmood Mat Yunus, Alireza Kharazmi, Elias Saion, Kasra Behzad
INTERNATIONAL JOURNAL OF THERMOPHYSICS
(2014)
Article
Multidisciplinary Sciences
Amir Reza Sadrolhosseini, A. S. M. Noor, Afarin Bahrami, H. N. Lim, Zainal Abidin Talib, Mohd. Adzir Mahdi
Article
Chemistry, Multidisciplinary
M. B. Ahmad, Y. Gharayebi, M. S. Salit, M. Z. Hussein, K. Shameli, A. Dehzangi, H. Jahangirian, S. Abdolmohammadi, K. Behzad
RESEARCH ON CHEMICAL INTERMEDIATES
(2015)
Article
Physics, Condensed Matter
Syuhada Abu Bakar, Nayereh Soltani, W. Mahmood Mat Yunus, Elias Saion, Afarin Bahrami
SOLID STATE COMMUNICATIONS
(2014)
Article
Nanoscience & Nanotechnology
Syuhada Abu Bakar, Nayereh Soltani, Elias Saion, W. Mahmood Mat Yunus, Afarin Bahrami
NANOSCIENCE AND NANOTECHNOLOGY LETTERS
(2014)
Article
Chemistry, Applied
Nina Moradpour, Sajjad Sedaghat, Parviz Aberoomand Azar, Kasra Behzad
Summary: In this study, a novel Cs/MCM-41-APS nanocomposite was successfully synthesized and applied as an adsorbent to remove aspirin from water. The optimized conditions for achieving 86% removal efficiency included using 3 g L^-1 adsorbent, an initial aspirin concentration of 30 mg L^-1, pH 4.6, room temperature, and a 55-minute contact time. The adsorption process followed the pseudo-second-order kinetics model, and the Freundlich isotherm model was found to be the best fit for the equilibrium data. Additionally, the adsorbent showed promising potential for regeneration and reuse.
APPLIED ORGANOMETALLIC CHEMISTRY
(2021)
Article
Optics
Kasra Behzad, Wan Mahmood Mat Yunus, Afarin Bahrami, Alireza Kharazmi, Nayereh Soltani
Article
Nanoscience & Nanotechnology
A. Bahrami, A. R. Sadrolhosseini, G. Mamdoohi, K. Bahzad, M. M. Abdi
DIGEST JOURNAL OF NANOMATERIALS AND BIOSTRUCTURES
(2015)
Article
Materials Science, Multidisciplinary
A. Kamalianfar, S. A. Halim, Kasra Behzad, Mahmoud Goodarz Naseri, M. Navasery, Fasih Ud Din, J. A. M. Zahedi, K. P. Lim, S. K. Chen, H. A. A. Sidek
JOURNAL OF OPTOELECTRONICS AND ADVANCED MATERIALS
(2013)
Article
Materials Science, Multidisciplinary
Nayereh Soltani, Elias Saion, Maryam Erfani, Afarin Bahrami, Manizheh Navaseri, Khadijeh Rezaee, Mohd Zobir Hussein
CHALCOGENIDE LETTERS
(2012)
Article
Electrochemistry
Kasra Behzad, Wan Mahmood Mat Yunus, Zainal Abidin Talib, Azmi Zakaria, Afarin Bahrami
INTERNATIONAL JOURNAL OF ELECTROCHEMICAL SCIENCE
(2012)
Proceedings Paper
Nanoscience & Nanotechnology
Bahrami Afarin, Z. A. Talib, W. Mahmood Mat Yunus, Kasra Behzad, Nayereh Soltani
NANOMATERIALS: SYNTHESIS AND CHARACTERIZATION
(2012)
