http://nopr.niscpr.res.in/handle/123456789/44543 2026-10-11T12:48:25Z http://nopr.niscpr.res.in/handle/123456789/44549 Title: Intermolecular interactions in binary mixtures of phosphonium based ionic liquid and propanoic acid Authors: Kabane, Bakusele; Chokkareddy, Rajasekhar; Bhajanthri, Natesh Kumar; Redhi, Gan G Abstract: Thermophysical properties of binary systems containing trihexyltetradecylphosphonium chloride [P⁺_{14, 6, 6, 6}] [Cl^̶] ionic liquid (IL) and propanoic acid (PA), have been investigated. Measurements of densities (<i>ρ</i>) and speeds of sound (<i>u</i>) have been made at <em>p</em> = 0.1 MPa and at varying temperatures ranging from 293.15 to 313.15 K. The computed excess properties which include excess molar volume (<i>V</i><img src='http://www.niscair.res.in/jinfo/em2.gif' border=0>), apparent molar volume (<i>V_φ</i>), intermolecular free length (<em>L</em>_f), isentropic compressibility (<i>k_s</i>), apparent molar isentropic compressibility (<i>K_φ</i>) and deviation in isentropic compressibility (<img src='/image/spc_char/delta.gif' border=0><i>k_s</i>) have been computed from the experimental data of densities and speeds of sound. Based on the calculated derived properties, it is evident that the investigated IL and PA exhibit strong interactions across the entire mole fraction composition. Good correlation has been achieved with the Redlich-Kister equation. Page(s): 753-760 2018-06-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/44548 Title: Deviations in viscosity and thermodynamics of viscous flow for binary mixtures of methyl acrylate with 1-alkanols at different temperatures Authors: Nain, A K; Droliya, P; Gupta, J Abstract: The viscosities (<em>η</em>) of binary mixtures of methyl acrylate with 1-butanol, 1-hexanol, 1-octanol and 1-decanol, including those of pure liquids, over the entire composition range are reported at different temperatures (288.15, 293.15, 298.15, 303.15, 308.15, 313.15, and 318.15) K. From the experimental data, the deviations in viscosity (<img src='/image/spc_char/delta.gif' border=0><em>η</em>) have been calculated. The <img src='/image/spc_char/delta.gif' border=0><em>η</em> values are found to be negative over the entire composition range for these mixtures, indicating the presence of weak interactions between methyl acrylate and 1-alkanol molecules. The magnitude of negative deviations in <img src='/image/spc_char/delta.gif' border=0><em>η</em> values follows the order: 1-butanol < 1-hexanol < 1-octanol < 1-decanol. It is observed that <img src='/image/spc_char/delta.gif' border=0><em>η</em> values depend upon the length of the alkyl chain in 1-alkanols. Also, the interactions between methyl acrylate and 1-alkanols decrease with increase in alkyl chain length. The thermodynamics of viscous flow has been analyzed by using Eyring and Arrhenius approaches and the results have been compared and discussed in terms of intermolecular interactions between the molecules. Further, the viscosities of these binary mixtures computed theoretically by using various empirical and semi-empirical models correlated well with the experimental findings in terms of average standard deviations. Page(s): 761-769 2018-06-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/44547 Title: Sensitive measurement of trace amounts of promethazine hydrochloride at MWCNT-COOH nanostructures modified pencil graphite electrode based on charge transfer complex formation Authors: Amani, Ali Mohammad; Motaghedifard, Mohammad Hassan; Honarmand, Ebrahim; Motmaen, Mahnaz; Ghasemi, Younes; Savardashtaki, Amir; Monfared, Ali Arabi Abstract: Functionalized multiwalled carbon nanotubes (MWCNT-COOH) pencil graphite electrode has been fabricated to detect trace amounts of promethazine hydrochloride (PMZ). The modified electrode has been applied in Fe^2+/3+ probes, hydroquinone probe and PMZ solutions by cyclic voltammetry and electrochemical impedance spectroscopy. The MWCNT-COOH/PGE shows better response for electrooxidation of PMZ as compared to MWCNT/PGE based on charge transfer complex formation. Two linear dynamic ranges are seen between 0.05 and 275.0 µM with the limit of detection of 5.61 nM in the analysis of PMZ by differential pulse voltammetry. The diffusion coefficient (<em>D</em>, cm² s⁻¹) and the kinetic parameters such as the electron transfer coefficient (α), and the ionic exchanging current density (<em>i</em>_o) for PMZ have also been determined using electrochemical approaches. The modified electrode has been applied to determine PMZ in real sample with satisfactory results. Page(s): 770-777 2018-06-01T00:00:00Z http://nopr.niscpr.res.in/handle/123456789/44546 Title: Hydroxylation of benzene and toluene by heterogeneous iron metal-organic framework (Fe-BTC) Authors: Bhattacharjee, Samiran Abstract: Liquid phase catalytic hydroxylation of benzene and toluene by Fe-containing metal-organic framework (Fe-BTC; BTC = 1,3,5-benzenetricarboxylate) using 30% hydrogen peroxide as an oxidant exhibits good activity and high product selectivity under mild reaction conditions. The effects of temperature, time, substrate/ hydrogen peroxide mole ratio and solvent on catalytic performance are investigated. The catalyst can be reused four times without significant loss of catalytic performance. The hot filtration experiments suggest that hydroxylation reaction occurs on the Fe sites in the MOF matrix. The crystallinity and structure of Fe-BTC remain unchanged during the catalysis reaction, as confirmed by comparison of XRD, FTIR and SEM of the fresh and reused catalyst. Page(s): 778-783 2018-06-01T00:00:00Z