研究目的
To improve the facility of measurement and speed of analysis of the speed of sound in liquids using a fixed-path length laser-induced sound pinging (FPL-LISP) setup, and to apply this technique to determine the speeds of sound in various deep eutectic solvents (DESs) at different temperatures.
研究成果
The FPL-LISP setup was successfully used to rapidly determine the speed of sound in small volumes of DESs. The hydrophilic DESs exhibited bulk moduli between 4000 and 5000 MPa, suggesting potential for hydraulic applications. The hydrophobic DESs had lower bulk moduli, comparable to common ionic liquids and water. The technique's speed and low volume requirements make it suitable for real-time analysis and investigation of scarce or hazardous samples.
研究不足
The technique requires a preanalysis system calibration using a liquid with a well-characterized speed of sound. The gold-coated slide must be compatible with the sample and cleaned between uses. The method is sensitive to impurities like water in the samples.
1：Experimental Design and Method Selection:
The FPL-LISP setup was designed to measure the speed of sound in liquids with a fixed path length, eliminating the need for variable path length adjustments and reducing measurement error. The setup includes a laser, optical fiber, ultrasound sensor, brass plate, thermoelectric Peltier cooler, heat sink, fan, amplifier, USB-oscilloscope, and computer.
2：Sample Selection and Data Sources:
The study used four hydrophilic DESs (reline, ethaline, glyceline, and maline) and several hydrophobic DESs based on decanoic acid. The speed of sound was measured at temperatures ranging from 293 to 333 K.
3：List of Experimental Equipment and Materials:
Equipment included a Q-switched laser, ultrasonic sensor, brass plate with an evaluation chamber, gold-coated microscope cover slide, Peltier device, temperature controller, density meter, viscometer, and Karl Fischer titrator.
4：Experimental Procedures and Operational Workflow:
The laser pulse impinged upon a gold-coated slide, generating a photoacoustic wave that propagated through the sample to the ultrasonic sensor. The time-of-flight was measured and used to calculate the speed of sound. The system was calibrated using pure water.
5：Data Analysis Methods:
The speed of sound was calculated from the time-of-flight and known path length. Bulk modulus was calculated using the speed of sound and density data.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
