Stationary and transient acoustically induced birefringence of methyl acetate molecules dissolved in ethanol
A detailed study of the acoustically induced birefringence has been performed in methyl acetate molecules in solutions with ethanol to evaluate the relative variations of the acoustic intensity. Static and dynamic birefringence signals are ascribed to the orientation of the molecules along the direction of the applied ultrasonic field. The birefringence in dilute and concentrated solutions was investigated as a function of frequency, ultrasonic intensity and concentration. The transient behavior of the birefringence is indicative of a single exponential function implying a single relaxation mechanism. Systematic analysis of the experimental results is performed in the context of the presence of two distinct types of MA molecules in the solutions, namely the molecules that are similar to those existing in bulk material and the “solution”-type molecules that are distorted after the interaction with the ethanol/solvent molecules. The estimated relatively slow relaxation times, obtained from the transient birefringence measurements, imply that the acoustically induced birefringence is affected by the collective motion over the short-to-medium range order. Relaxation times exhibit a characteristic change below and above ~ 0.6 volume fraction of MA, which is related to the presence of the two discrete types of methyl acetate molecules in the solutions.
KeywordsAcoustically induced birefringence Stationary birefringence Transient birefringence Reorientational relaxation Collective motion
The authors gratefully acknowledge financial support from the University of Ioannina. Furthermore, we would like to express our thanks to Professor Dr. C. Kosmidis and the personnel of the Central Laser Facility of Ioannina University for access on their facilities and their help.
Compliance with ethical standards
Conflict of interest
On behalf of all authors, the corresponding author states that there is no conflict of interest.
- De Gennes PG, Prost J (1993) The physics of liquid crystals. Claredron, OxfordGoogle Scholar
- Frohlich H (1949) Theory of dielectrics; dielectric constant and dielectric loss. Oxford Clarendon Press, LondonGoogle Scholar
- Hurtado-Aviles EA, Torres JA, Trejo-Valdez M, Romero-Ángeles B, Villalpando I, Torres-Torres C (2018) Amplitude-modulated acoustic waves by nonlinear optical signals in bimetallic Au-Pt nanoparticles and ethanol based nanofluids. J Mol Liq 263:288–293. https://doi.org/10.1016/j.molliq.2018.05.019 CrossRefGoogle Scholar
- Hurtado-Aviles EA, Torres JA, Trejo-Valdez M, Torres-SanMiguel CR, Villalpando I, Torres-Torres C (2019) Ultrasonic influence on plasmonic effects exhibited by photoactive bimetallic Au-Pt nanoparticles suspended in ethanol. Materials 12:1791. https://doi.org/10.3390/ma12111791 CrossRefPubMedCentralGoogle Scholar
- Mpourazanis P, Stogiannidis G, Tsigoias S, Papatheodorou GN, Kalampounias AG (2019b) Ionic to covalent glass network transition: effects on elastic and vibrational properties according to ultrasonic echography and Raman spectroscopy. J Phys Chem Solids 125:43–50. https://doi.org/10.1016/j.jpcs.2018.10.010 CrossRefGoogle Scholar
- Nomura H, Matsuoka T, Koda S (2004) Ultrasonically induced birefringence in liquids and solutions. In: Samios J, Durov VA (eds) Novel approaches to the structure and dynamics of liquids: experiments, theories and simulations. Kluwer Academic Publishers, Dordrecht, pp 167–192. https://doi.org/10.1007/978-1-4020-2384-2_10 CrossRefGoogle Scholar
- Scruby CB, Drain LE (1990) Laser ultrasonics. Adam Higler, BristolGoogle Scholar