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Fixed-Path Length Laser-Induced Sound Pinging: A Streamlined Method for Sound Speed Determination in Arbitrary Liquids
摘要： Recently, we introduced laser-induced sound pinging (LISP) as a simple photoacoustic technique for the expedient and fairly rapid (2?3 min) measurement of the speed of sound traversing low-volume samples (25?1000 μL), built around an inexpensive tattoo-removal source (Sens. Actuators B-Chem. 2019, 291, 401?410). In this report, we expand on the utility of this technique by improving the facility of measurement and speed of analysis by adopting a ?xed-path length (FPL) architecture which allows for much faster analysis (1?5 s) of similar sample volumes. The FPL-LISP setup was employed to determine the speeds of sound at temperatures from 293 to 333 K for four popular hydrophilic deep eutectic solvents (DESs) containing choline chloride (i.e., reline, ethaline, glyceline, and maline), plus several representative decanoic acid?based (i.e., hydrophobic) DESs. The temperature-dependent speeds of sound were used alongside the corresponding experimental densities to calculate the bulk modulus for these illustrative DESs. Interestingly, the bulk modulus was in the 4000?5000 MPa range for choline chloride-derived DESs, essentially twice the value of a hydrophobic DES (typi?ed by 1:2 tetraoctylammonium bromide/decanoic acid), suggesting unique potential for hydraulic applications, for example. The modest volume requirements of FPL-LISP make it suitable for determining the speed of sound in scarce, precious, or hazardous liquids, and the speed of analysis enables integration into a continuous-?ow platform for real-time analytics (e.g., beverage quality control).
关键词： bulk modulus,speed of sound,laser-induced sound pinging,photoacoustic technique,deep eutectic solvents
更新于2025-09-12 10:27:22
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Thermal conductivity of silicon nanomaterials measured using the photoacoustic technique in a piezoelectric configuration
摘要： In this study, we investigated the thermal transport in porous silicon nanostructures and silicon nanowires fabricated by electrochemical and metal-assisted chemical etching processes, respectively. In particular, the thermal conductivity values for the silicon-based nanomaterials were estimated based on photoacoustic measurements obtained from piezoelectric recordings. The amplitude–frequency and phase–frequency dependencies of the photoacoustic responses of the nanostructured silicon samples were obtained, and simulated successfully with a theoretical model. Correlations were established between the thermal conductivities and etching parameters.
关键词： Silicon nanomaterial,Piezoelectric recording,Thermal conductivity,Photoacoustic technique
更新于2025-09-09 09:28:46
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Measurement of the thermal expansion coefficient of Guadua angustifolia-Kunth using the photoacoustic technique
摘要： In this paper, the Linear Thermal Expansion Coefficient of Guadua angustifolia–Kunth samples was measured using the Photoacoustic (PA) technique in a heat transmission configuration and considering the thermoelastic bending as a PA signal generation mechanism in addition to the thermodiffusion ones. The obtained value of (27±7)×10-6K-1 is a reasonable value compared with that reported for similar materials such as wood.
关键词： photoacoustic technique,thermal expansion coefficient,Guadua angustifolia-Kunth
更新于2025-09-04 15:30:14