• Manisha Gupta

      Articles written in Pramana – Journal of Physics

    • Relaxation intensity in some polyacrylates

      Manisha Gupta Sangita Madhuri Mathur Jagdish Shukla

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      Empirical formula suggested by Kita and Koizumi for evaluation of relaxation intensity in a limited range of frequency around the relaxation frequency for the Cole-Cole type distribution has been tested for poly butyl acrylate (PBA), Poly butyl methacrylate (PBMA) and poly isobutyl methacrylate (PiBMA).

      The relaxation intensity Δε is expressed in terms ofε″M, the dielectric loss maxima andW, the frequency separation for half, two thirds or three quarters ofε″M, in the form Δε=ε″M/[(C1/W)+C2+C3W], where the numerical constantsC1,C2,C3 are given for the respective type of relaxation.

    • Ultrasonic and infrared study of molecular interactions in ternary mixtures of 1-naphthol and 2-naphthol with 2-propanone in benzene

      Isht Vibhu Amit Misra Manisha Gupta J P Shukla

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      The measurements of ultrasonic velocity and density were made for the ternary mixtures of l-naphthol/2-naphthol with 2-propanone in benzene at 20, 30 and 40°C in the mole fraction range of 0.00 to 0.05. Adiabatic compressibility and intermolecular free length have been evaluated using ultrasonic velocity data. The non-linear variation of ultrasonic velocity and allied parameters with mole fraction indicates solute-solute interactions through hydrogen bonding between unlike molecules. Results of ultrasonic velocity and density measurements are further supported by FT-IR spectra. The change in transmittance as well as the shift in the frequency of the representative peak of the OH stretching in FT-IR spectra give inferences about the complex formation.

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