• N Kumar

      Articles written in Journal of Chemical Sciences

    • Observation of a plastic crystalline phase in solidMBBA

      S Arumugam S V Bhat N Kumar K V Ramanathan R Srinivasan

      More Details Abstract Fulltext PDF

      Wideline and high resolutionNMR studies have been carried out inMBBA in its isotropic, nematic and solid phases. Isotropie and nematic spectra correspond to what has been reported earlier. In the solid phase, contrary to expectations, very intense narrow signals similar to signals of the isotropic phase have been observed for the first time at temperatures close to the solid ↔ nematic phase transition temperature. This indicates rapid reorientational or translational motion in the system. X-ray results however confirm the existence of translational order. The results are interpreted as indicative of the existence of a plastic crystalline phase inMBBA.

    • Density and viscosity of magnesium sulphate in formamide + ethylene glycol mixed solvents

      A Alp A K Nain N Kumar M Ibrahim

      More Details Abstract Fulltext PDF

      Densities (ρ) and viscosities (η) of different strengths of magnesium sulphate (MgSO4) in varying proportions of formamide (FA) + ethylene glycol as mixed solvents were measured at room temperature. The experimental values of ρ and η were used to calculate the values of the apparent molar volume, (φ1,), partial molar volume, (φ1,) at infinite dilution,A- andB-coefficients of the Jones-Dole equation and free energies of activation of viscous flow, (Δμ10*) and (Δμ20*), per mole of solvent and solute respectively. The behaviour of these parameters suggests strong ion-solvent interactions in these systems and also that MgSO4 acts as structure-maker in FA + ethylene glycol mixed solvents.

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