Experimental Investigations on Ultrasonic Velocity and Behavior of Thermodynamic Parameters of Four Members of nO.m Series

2011 ◽  
Vol 181-182 ◽  
pp. 43-46
Author(s):  
D. Madhavi Latha ◽  
V.G.K.M. Pisipati ◽  
M. Ramakrishna Nanachara Rao ◽  
P.V. Datta Prasad
Keyword(s):  
Sound Velocity ◽  
Ultrasonic Velocity ◽  
Adiabatic Compressibility ◽  
Experimental Investigations ◽  
Velocity Measurements ◽  
Acoustic Parameters ◽  
Free Length ◽  
Smectic A ◽  
And Behavior ◽  
Available Volume

Ultrasonic velocity measurements are carried out on fournOmcompounds viz., N-(p-n-methoxy and ethoxy benzylidene)-p-n-dodecyl and tetradecyl anilines, 1O.12, 1O.14, 2O.12 and 2O.14. The first three compounds exhibit mono variant nematic phase while the last compound exhibits nematic and smectic-A phases with variable thermal ranges. The temperature dependence of sound velocity, U shows minima at the isotropic-nematic and nematic-smectic-A transitions. In conjunction with the density data of these compounds, the thermo acoustic parameters such as adiabatic compressibility (βad), the molar sound velocity (Rao’s number) (Rn), molar compressibility (W), molecular free length (Lf) and available volume (Va) are estimated. In addition the intermolecular free length (Lf) is estimated in three different ways employing density and ultrasonic velocity data. The results are compared with the data available in literature of other compounds.

scholarly journals Acoustical Investigation of N–(2-hydroxybenzylidene)-3-Substituted Pyridine -2- Amine Schiff bases by Ultrasonic Velocity Measurements in Dioxane at Different Temperatures

2016 ◽  
Vol 4 (1) ◽  
Author(s):  
Mrunal M. Mahajan ◽  
Pravin B. Raghuwanshi
Keyword(s):  
Schiff Bases ◽  
Ultrasonic Velocity ◽  
Adiabatic Compressibility ◽  
Water Molecules ◽  
Water Medium ◽  
Velocity Measurements ◽  
Acoustic Parameters ◽  
Intermolecular Free Length ◽  
Different Temperatures ◽  
Solvent Molecules

<div><p><em>The present work deals with the study of acoustic parameters like ultrasonic velocity (V), </em><em>adiabatic compressibility (β<sub>s</sub>), apparent molar volume (</em><em>f</em><em><sub>v</sub></em><em>) and intermolecular free length (L<sub>f</sub>) by ultrasonic </em><em>interferometric measurements</em><em> which reflects structural interaction of water molecules and organic solvent molecules with substituted Schiff bases. The study of N–(2-hydroxybenzylidene)-3-substituted pyridine -2- amine Schiff bases were carried in different percentage of 1,4-dioxane-water medium, at 293, 297 and 300 K. The densities and velocities thus obtained were used to evaluate acoustic parameters for all the ligands.</em></p></div>

scholarly journals Phase Transition Studies in Polymesomorphic Compounds II. Ultrasonic Velocity Studies in N(p-n-Heptyloxy Benzylidene)p-n-Butyl Aniline

1982 ◽  
Vol 37 (11) ◽  
pp. 1262-1265
Author(s):  
V. G. K. M. Pisipati ◽  
N. V. S. Rao
Keyword(s):  
Phase Transition ◽  
Phase Transitions ◽  
Sound Velocity ◽  
Ultrasonic Velocity ◽  
Adiabatic Compressibility ◽  
First Order ◽  
Smectic A ◽  
Smectic C ◽  
Good Agreement ◽  
Transition Studies

The variation of ultrasonic velocity in N (p-n-heptyloxy benzylidene)p-n-butyl aniline, (HyBBA) with temperature in isotropic, nematic, smectic-A, smectic-C and smectic-G phases is measured. All the phase transitions I-N, N-SA, SA-SC and SC-SG are found to be of first order. The adiabatic compressibility βad, molar sound velocity or Rao number Rn, and molar compressibility or Wada constant AW are computed. Rn and AW of HyBBA are compared with theoretical values and found to be in good agreement with the theory.

scholarly journals Low Energy Gamma Radiation Induced Effects on Ultrasonic Velocity and Acoustic Parameters in Polyvinylidene Fluoride Solution

2016 ◽  
Vol 2016 ◽  
pp. 1-8
Author(s):  
S. S. Kulkarni ◽  
U. V. Khadke
Keyword(s):  
Polymer Solution ◽  
Dose Rate ◽  
Ultrasonic Velocity ◽  
Polyvinylidene Fluoride ◽  
Ultrasonic Attenuation ◽  
Ferroelectric Properties ◽  
Adiabatic Compressibility ◽  
Free Path Length ◽  
Low Energy ◽  
Acoustic Parameters

The modification of polyvinylidene fluoride (PVDF) polymer properties with irradiation is of interest as it possesses unique piezo-, pyro-, and ferroelectric properties. In this paper, we report the results of acoustic parameters of irradiated PVDF mixed with dimethylacetamide (DMAC) solution with low energy γ-source (Cs-137). The polymer solution covered with mica film assures only γ-ray passage and the duration was increased from 18 to 50 hours to achieve the higher dose rate. The dose rate was estimated using the strength of the radioactive source and the duration of the exposure. The ultrasonic velocity (v), density (ρ), and viscosity (η) of 0.2 wt% and 0.5 wt% PVDF dissolved in pure DMAC solution, irradiated with different dose rate were measured using ultrasonic interferometer (Mittal make), Pyknometer, and Oswald’s viscometer, respectively. It is observed that the values of v, ρ, and η change with dose rate. The acoustic parameters such as adiabatic compressibility (β), intermolecular free path length (Lf), acoustic impedance (Z), relative association (RA), ultrasonic attenuation (α/f2), and relaxation time (τ) are calculated using the experimental data. These results are interpreted in terms of the solute-solvent interaction in a polymer solution and scissoring chain damage.

Ultrasonic Characterization of Silver Nanoparticles

2005 ◽  
Vol 23 ◽  
pp. 271-274
Author(s):  
S. Rajagopalan ◽  
S.J. Sharma ◽  
V.Y. Nanotkar
Keyword(s):  
Silver Nanoparticles ◽  
Ultrasonic Velocity ◽  
Colloidal Solution ◽  
Adiabatic Compressibility ◽  
Ammonium Bromide ◽  
Velocity Measurements ◽  
Abnormal Behaviour ◽  
Phase Separations ◽  
Ultrasonic Characterization

Nanoparticles exhibit unusual properties in contrast with their bulk properties due to small particle size and quantum confinement. In the present work, ultrasonic velocity and density measurements have been carried out in solutions of silver nanoparticles in micellar dispersion of cetyl tri-metyl ammonium bromide, CTAB. Ultrasonic velocity measurements at different concentrations of surfactant and temperatures were carried out using Sing-Around technique, operated at 2MHz. It is observed that ultrasonic velocity and adiabatic compressibility show abnormal behaviour with increase in concentration of CTAB in the solution, indicating the existence of the phase separations in nano-colloidal solution.

Apparatus for the Measurement of Isothermal and Adiabatic Compressibility of Gases up to 10 Kbar

1983 ◽  
Vol 22 ◽  
Author(s):  
S.N. Biswas ◽  
M.J.P. Muringer ◽  
N.J. Trappeniers
Keyword(s):  
Sound Velocity ◽  
Adiabatic Compressibility ◽  
Melting Line ◽  
Velocity Measurements ◽  
Ultrasonic Apparatus ◽  
Gas Expansion ◽  
Pulse Echo

ABSTRACTA pVT apparatus based on a combination of gas expansion and isochoric method and an ultrasonic apparatus for sound velocity measurements based on phase comparison pulse-echo technique have been developed for precise measurements of isothermal and adiabatic compressibility of gases at pressures up to 10 kbar and temperatures down to the melting line.

scholarly journals Ultrasonic Investigation of Molecular Interactions in Binary Mixtures at 303 K

2009 ◽  
Vol 6 (1) ◽  
pp. 138-140 ◽  
Author(s):  
R. Nithya ◽  
S. Nithiyanantham ◽  
S. Mullainathan ◽  
M. Rajasekaran
Keyword(s):  
Free Volume ◽  
Binary Mixtures ◽  
Ultrasonic Velocity ◽  
Molecular Interactions ◽  
Molecular Interaction ◽  
Binary Systems ◽  
Adiabatic Compressibility ◽  
Acoustical Parameters ◽  
Free Length ◽  
Ultrasonic Investigation

The ultrasonic velocity, density and viscosity at 303 K have been measured in the binary systems of toluene with benzene ando-xylone with benzene. The acoustical parameters such as adiabatic compressibility, free length, free volume and acoustical impedance are calculated. The results are interpreted in terms of molecular interaction between the components of the mixtures

Specific Volume and Ultrasonic Velocity Studies of the Liquid Crystal N-(p-n-hexyloxybenzylidene)-p-n-butylaniline (Hx BBA)

1983 ◽  
Vol 38 (7) ◽  
pp. 762-764 ◽  
Author(s):  
L. V. Choudary ◽  
J. V. Rao ◽  
P. N. Murty ◽  
C. R. K. Murty
Keyword(s):  
Thermal Expansion ◽  
Liquid Crystal ◽  
Ultrasonic Velocity ◽  
Specific Volume ◽  
Velocity Variation ◽  
Velocity Measurements ◽  
First Order ◽  
Smectic A ◽  
Thermal Expansion Coefficients ◽  
Expansion Coefficients

Abstract Specific volume and ultrasonic velocity measurements have been carried out on the liquid crystal N-(p-n-hexyloxybenzylidene)-p-n-butylaniline in the isotropic, nematic, smectic A, smectic B and smectic G phases. The variation of the specific volume with temperature shows that the corresponding transitions are of first order. Thermal expansion coefficients have been calculated for all the mesophases. The ultrasonic velocity variation with temperature confirms the transitions.

scholarly journals Computational studies on physico-chemical properties in the quality analysis of corn and peanut oil

2022 ◽  
Vol 72 (4) ◽  
pp. e427
Author(s):  
S. Rubalya Valantina ◽  
K. Arockia Jayalatha
Keyword(s):  
Ultrasonic Velocity ◽  
Chemical Potential ◽  
Corn Oil ◽  
Oil Quality ◽  
Adiabatic Compressibility ◽  
Correlation Factor ◽  
Peanut Oil ◽  
Quality Analysis ◽  
Free Length ◽  
Intermolecular Free Length

Oils are commonly used in cooking as a frying medium which has been constantly subjected to different levels of heating. In this work, we have considered the most commonly used oils namely peanut oil and corn oil. Quality analyses of corn and peanut oils were made by relating macroscopic properties (ultrasonic velocity, viscosity, and density) to microscopic parameters (intermolecular free length, adiabatic compressibility etc.,) by subjecting them to six cycles of heating (190 ˚C). Variation in the mentioned property indexes, the degree of degradation and reusability for the next heating cycle that could be used in the food industry and processing were monitored. Using Newton-Laplace and Wood’s equation, the adiabatic compressibility, acoustic impedance, and intermolecular free length of the oil were estimated from the experimental data. Ultrasonic velocity was observed linearly as related to viscosity with the dependency factor (R2 = 0.932). With the aid of experiential data, the physical thermodynamic parameters, particularly particle size, packing factor, chemical potential, and L-J potential were computed. A high correlation factor was observed by fitting ultrasonic velocity, viscosity, and density to Parthasarathy and Bakshi, and Rodenbush equations. In the study, ultrasonic velocity, a macroscopic parameter, could be decoded to determine the microscopic variations in oil subjected to different temperatures in an industrial application.

scholarly journals Effect of Solvents on the Ultrasonic Velocity and Acoustic Parameters of Polyvinylidene Fluoride Solutions

2016 ◽  
Vol 2016 ◽  
pp. 1-6 ◽  
Author(s):  
S. S. Kulkarni ◽  
U. V. Khadke
Keyword(s):  
Ultrasonic Velocity ◽  
Polyvinylidene Fluoride ◽  
Ultrasonic Attenuation ◽  
Adiabatic Compressibility ◽  
Free Path Length ◽  
Solvent Mixtures ◽  
Acoustic Parameters ◽  
Effect Of Solvents ◽  
Molecular Behavior ◽  
Ostwald Viscometer

Ultrasonic studies provide a wealth of information in understanding the molecular behavior and intermolecular interaction of polymer solvent mixtures. Attempts were made to measure ultrasonic velocity, density, and viscosity for the mixture of polyvinylidene fluoride (PVDF) in acetone and dimethylformamide (DMF) of various stoichiometric ratios at 300 K using crystal controlled ultrasonic interferometer (Mittal make), pyknometer (specific gravity bottle), and Ostwald viscometer, respectively. The acoustic parameters adiabatic compressibility (β), intermolecular free path length (Lf), acoustic impedance (Z), relative association (RA), ultrasonic attenuation (α/f2), and relaxation time (τ) have been estimated using experimental data with well-known techniques. The variation of these acoustic parameters is explained in terms of solute-solvent molecular interaction in a polymer solution.

scholarly journals Ultrasonic Velocity & other Related Parameters

2019 ◽  
Vol 8 (2) ◽  
pp. 3654-3657
Keyword(s):  
Experimental Determination ◽  
Key Words ◽  
Sound Velocity ◽  
Ultrasonic Velocity ◽  
Adiabatic Compressibility ◽  
Degree Of Polymerization ◽  
Ultrasonic Velocities ◽  
Ultrasonic Interferometer ◽  
Ethylene Glycols

Ultrasonic velocity is an important parameter, characterizing the state of the system. It can be determined experimentally by using Ultrasonic Interferometer. A brief discussion of ultrasonic interferometer and mode of determining ultrasonic velocities is given. The present paper deals with the experimental determination of ultrasonic velocities and adiabatic compressibility’s of ethylene glycols and higher homologous. From the ultrasonic velocity, closely related parameters like molar sound velocity, molar compressibility, and Vander Waal’s constant ….etc. are evaluated. The variations in ultrasonic velocity and related parameters with degree of polymerization and a phenomenal reasoning for the same are also permuted. key words: Ultrasonic velocity, Adiabatic Compressibility, Molar sound velocity, Molar compressibility, Vander Waal’s Constant and Inter Molecular Free length

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