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Spin-Probe ESR Studies on Nanocomposite Polymer Electrolytes

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Abstract

The possibility of using spin-probe electron spin resonance (ESR) as a tool to study glass transition temperature, T g, of polymer electrolytes is explored in 4-hydroxy-2,2,6,6-tetramethylpiperidine-N-oxyl (TEMPOL)-doped composite polymer electrolyte (PEG)46LiClO4 dispersed with nanoparticles of hydrotalcite. The T g is estimated from the measured values of T 50G, the temperature at which the extrema separation 2A zz of the broad powder spectrum decreases to 50 G. In another method, the correlation time τc for the spin probe dynamics was determined by computer simulation of the ESR spectra and T g has been identified as the temperature at which τc begins to show temperature dependence. While both methods give values of T g close to those obtained from differential scanning calorimetry, it is concluded that more work is required to establish spin-probe ESR as a reliable technique for the determination of T g.

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Acknowledgments

Two of the authors, M.M.B. and D.B. thank the Council for Scientific and Industrial Research of India for the grant of fellowships. S.V.B. and L.K. thank the Indian National Science Academy and the Hungarian Academy of Sciences for supporting an exchange programme between the two countries. S.V.B. acknowledges the Department of Science and Technology of India for Nano Science and Technology Initiative project funding.

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Authors and Affiliations

  1. Department of Physics, Indian Institute of Science, Bangalore, 560012, India

    Madhurjya M. Borgohain, D. Banerjee & S. V. Bhat

  2. Chemical Research Center, Hungarian Academy of Sciences, Budapest, Hungary

    L. Korecz

Authors
  1. Madhurjya M. Borgohain
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  2. D. Banerjee
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  3. L. Korecz
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  4. S. V. Bhat
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Correspondence to S. V. Bhat.

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Borgohain, M.M., Banerjee, D., Korecz, L. et al. Spin-Probe ESR Studies on Nanocomposite Polymer Electrolytes. Appl Magn Reson 36, 149–156 (2009). https://doi.org/10.1007/s00723-009-0030-6

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  • DOI: https://doi.org/10.1007/s00723-009-0030-6

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