Molecular Interaction and Intermolecular Dynamics of Mentha Oil Investigated by Multi-Frequency Ultrasonic Techniques

Rupa; Sanjeev Rathore; Suman Lata

Molecular Interaction and Intermolecular Dynamics of Mentha Oil Investigated by Multi-Frequency Ultrasonic Techniques

Author(s)	Rupa, Sanjeev Rathore, Suman Lata
Country	India
Abstract	Understanding of the molecular connections along with the intermolecular dynamics of essential oils is of importance due to the improvement of quality, stability, processing, and applications of essential oils. Among all methods, ultrasonic methods are known for being cheap, quick, and sensitive for the study of liquids' internal structures and the properties. Despite the fact that studies on essential oils have been conducted so far, most of them were restricted by single-frequency measurements or studies on thermophysical properties on the macro level, which did not provide a significant number of information regarding molecular mechanisms of the structure changes with temperature. In particular, large studies that would allow clarifying the influence of temperature and ultrasonic frequency on the intermolecular dynamics of Mentha oil are missing. We conducted the study on intermolecular dynamics and interactions of the aqueous solution of Mentha oil within the temperature range from 293.15 K to 343.15 K while conducting multi-frequency ultrasonic testing at frequencies 2 and 3 MHz. We measured ultrasonic velocity, density, and viscosity and evaluated parameters such as acoustic impedance, adiabatic compressibility, intermolecular free length, relaxation time, absorption coefficient, and wavelength using thermodynamic equations. According to the results of the experiments, increasing temperature decreases the ability of molecules to interact and function together. Also, increasing temperature influences different aspects like density, viscosity, acoustic impedance, relaxation time, and ultrasonic absorption. In addition, the research shows differences in adiabatic compressibility, intermolecular free length, and ultrasonic velocity which result in a better movement of molecules, increase in the distance between them, and signify the existence of changes ongoing in the liquid. Another observation made in the course of this research is that 3 MHz frequency can be considered to be more efficient than 2 MHz frequency for recognizing more slight changes that occur due to the temperature changes. Thus, it allows revealing definite processes ongoing in the molecules. Such findings prove the efficiency of the multi-frequency ultrasonic characterization method and show the possibilities of this method to studies the influence of thermal excitation. What is more, the research reveals more information on the relationship between the impact of heating, intermolecular forces, and acoustic response when it comes to Mentha oil. The study can be considered useful since it contributes to the understanding of liquid systems in terms of temperature-dependent processes of molecules interaction. .
Keywords	Mentha oil; Molecular interactions; Multi-frequency ultrasonics; Thermo-acoustic properties; Ultrasonic velocity; Acoustic impedance; Adiabatic compressibility; Intermolecular free length; Relaxation time; Liquid-state dynamics
Published In	Volume 17, Issue 1, January-March 2026
Published On	2026-03-05

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Molecular Interaction and Intermolecular Dynamics of Mentha Oil Investigated by Multi-Frequency Ultrasonic Techniques

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