Ultrasonic Studies in N-(p-n-butoxybenzylidene)-p-n-butylaniline

1981 ◽  
Vol 36 (9) ◽  
pp. 1002-1005
Author(s):  
J. V. Rao ◽  
C. R. K. Murty
Keyword(s):  
Sound Velocity ◽  
Ultrasonic Velocity ◽  
Nematic Phase ◽  
Adiabatic Compressibility ◽  
Sonic Velocity ◽  
Isotropic Liquid ◽  
Liquid Phases ◽  
First Time ◽  
Experimental Density

AbstractThe ultrasonic velocity in the SG(SH), SB, SA, Nc , N0 and isotropic liquid phases of N-(p-n-butoxybenzylidene)-p-n-butylaniline (BBBA) has been measured as a function of temperature. A transition in the nematic phase seems to indicate the existence of an ordinary nematic and a cybotactic nematic phase. The transition SG-SB has been found for the first time with the ultra-sonic velocity method. The adiabatic compressibility βad and the molar sound velocity Rn (Rao number) have been determined using the experimental density and ultrasonic velocity.

Density, Refractive Index and Ultrasonic Velocity Studies Involving N-(p-n-Pentyloxybenzylidene)-p-n-octylaniline

1985 ◽  
Vol 40 (5) ◽  
pp. 472-475 ◽  
Author(s):  
V. G. K. M. Pisipati ◽  
N. V. S. Rao ◽  
P. V. Datta Prasad ◽  
P. R. Alapati
Keyword(s):  
Refractive Index ◽  
Ultrasonic Velocity ◽  
Adiabatic Compressibility ◽  
Isotropic Liquid ◽  
First Order ◽  
Smectic A ◽  
Liquid Phases ◽  
First Order Transition ◽  
Nematic Phases ◽  
Enthalpy Data

The density, refractive index and ultrasonic velocity dependence on temperature for N-(p-npentyloxybenzylidene)- p-n-octylaniline, 50.8, is presented. The compound 50.8 exhibits smectic-B, smectic-A and nematic phases between the solid and isotropic liquid phases. The nematic-isotropic and smectic A-smectic B phase transformations are found to be first order. The interesting smectic A - nematic transformation is confirmed from the results to be second order, although the thermal expansion coefficient and reported enthalpy data had suggested a weak first order transition. The computed adiabatic compressibility, βad, molar sound velocity, Rn, and molar compressibility Aw are presented.

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

scholarly journals Studies on Acoustic and Aggregation Properties of Sodium Dodecyl Sulfate in Amino Acid Solutions through Ultrasonic Velocity Technique

2019 ◽  
Vol 31 (5) ◽  
pp. 1113-1127
Author(s):  
M. Roksana Khatun ◽  
M. Monirul Islam ◽  
Md. Nazrul Islam ◽  
Md. Masudur Rhaman ◽  
Ranjit K. Nath
Keyword(s):  
Amino Acid ◽  
Sodium Dodecyl Sulfate ◽  
Sound Velocity ◽  
Ultrasonic Velocity ◽  
Sodium Dodecyl ◽  
Adiabatic Compressibility ◽  
Acoustic Properties ◽  
Significant Information ◽  
Aggregation Behaviour ◽  
Dodecyl Sulfate

Acoustic and aggregation properties of sodium dodecyl sulfate in aqueous amino acid systems have been studied through ultrasonic velocity techniques at different temperature as a function of concentration and at different temperature (288.15, 293.15, 298.15, 303.15, 308.15, 313.15, 318.15 and 323.15 K) and atmospheric pressure using density and sound velocity analyzer (DSA 5000, Anton paar, Austria). Densities and ultrasonic velocity of sodium dodecyl sulfate in aqueous amino acid have been measured and from the experimental data, adiabatic compressibility (βS), apparent molar adiabatic compressibility (φk), critical micelle concentration (CMC), acoustic impedance (Z), relative association (RA) and molar sound velocity (Rm) have been calculated. The results show significant information about acoustic properties of sodium dodecyl sulfate (solute-solute interactions, aggregation behaviour, relative association and structure formation) in aqueous and aqueous amino acid solution.

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.

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 Ultrasonic study of molecular interactions in binary mixtures of methyl methacrylate(MMA) with toluene and dimethylacetamide at 318 K

2016 ◽  
Vol 4 (1) ◽  
pp. 1
Author(s):  
R.G. Indhumathi
Keyword(s):  
Methyl Methacrylate ◽  
Binary Systems ◽  
Adiabatic Compressibility ◽  
Acoustical Parameters ◽  
Binary Solutions ◽  
Intermolecular Free Length ◽  
Wada’S Constant ◽  
Ultrasonic Measurements ◽  
Rao’S Constant ◽  
First Time

<p>The ultrasonic velocity, density and viscosity at 318K have been measured in the binary systems of Methyl methacrylate + Toluene and Methyl methacrylate + Dimethylacetamide. In this work an attempt has been made for the first time to investigate the behavior of binary solutions of Methylmethacrylate(MMA) in Toluene and Dimethylacetamide(DMAC) with regard to acoustical parameters such as adiabatic compressibility(β), intermolecular free length(l<sub>f</sub>), free volume(V<sub>f</sub>), Rao’s constant(R), Wada’s constant(W) and specific acoustical impedance(Z) from ultrasonic measurements at 318 K were calculated. The results are interpreted in terms of molecular interaction between the components of mixtures.</p>

scholarly journals Acoustic, thermal and optical properties of organic based disodium tartrate salt

2021 ◽  
Vol 2 (1) ◽  
pp. 012-027
Author(s):  
M. Sathish ◽  
K. Venkataramanan ◽  
R. Padmanaban ◽  
Helan Ruth ◽  
K. Vadivel ◽  
...  
Keyword(s):  
Optical Properties ◽  
Aqueous Solutions ◽  
Internal Pressure ◽  
Ultrasonic Velocity ◽  
Relative Viscosity ◽  
Adiabatic Compressibility ◽  
Lower Percentage ◽  
Wada’S Constant ◽  
Different Temperatures ◽  
Solvent Molecules

In this work, acoustic, thermal, and optical properties were tested on the different concentrations of the Disodium Tartrate solutions. First, the viscosity studies were analyzed for the Disodium tartrate in the concentration range from 2% to 20% with different temperatures 303K, 308K, 313K, and 318K. It was noted that the relative viscosity and the activation energy of the prepared compound increase with increases in concentration and decreases with temperature increases. The properties like density and ultrasonic velocity are varied when increases the concentration of the aqueous solutions of Disodium Tartrate. In this study, the values of adiabatic compressibility show an inverse behavior when compared with ultrasonic velocity due to the interaction between solute and solvent molecules. Also observed that the inter-molecular free length is maximum for a lower percentage. The free volume for the compound is maximum at 2% and a minimum of 20%, since it reduces when the internal pressure increases. It was revealed that the classical absorption coefficient and relaxation time for Disodium Tartrate is minimum for lower percentage and minimum for a higher percentage. The interactions between the solute and solvent are confirmed through the property like specific Acoustical impedance. It was noted that the increase in internal pressure increases the concentration of the compound. The ion-solvent interaction was discussed by the relative association study, thus the values of relative association increases with an increase in concentration. The Rao’s and Wada’s constant increases linearly in aqueous solutions of Disodium Tartrate for the entire system.

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