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Dark Conductivity and Photoconductivity of Nonaqueous Liposomes: a New Method for Measuring the Phase-Transition Temperatures of Lipid Membranes

  • STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS
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Abstract

A new method is developed to measure the phase-transition temperatures in artificial phospholipid membranes. This method is based on studying the temperature dependence of dark conductivity and photoconductivity in a symmetric cell with current-conducting indium–tin oxide (ITO) electrodes. Internal electron photoemission into a thin liposome layer is induced by visible and near IR light from the ITO electrodes. This method is applied to study the lyotropic phases in 1,2-dipalmitoyl-rac-glycero-3-phosphocholine (DPPC) and 1,2-distearoyl-sn-glycero-3-phosphocholine (DSPC) with ethylene glycol (EG) and glycerol (G). The results of time-of-flight measurements are used to calculate the carrier mobilities in liposome vesicles. The measurement results are compared with the results obtained by dc conductometry. We are the first to detect the effect of a positive temperature coefficient of resistivity in a liquid-crystal phase. The proposed method makes it possible to detect the phase transitions in lyotropic liquid-crystal systems and, hence, can be used to create biocompatible drug carriers based on thermosensitive liposomes.

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Authors and Affiliations

  1. Shubnikov Institute of Crystallography, FSRC Crystallography and Photonics, Russian Academy of Sciences, Leninskii pr. 59, 119333, Moscow, Russia

    S. V. Yablonskii & V. V. Bodnarchuk

Authors
  1. S. V. Yablonskii
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  2. V. V. Bodnarchuk
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Correspondence to S. V. Yablonskii.

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Translated by K. Shakhlevich

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Yablonskii, S.V., Bodnarchuk, V.V. Dark Conductivity and Photoconductivity of Nonaqueous Liposomes: a New Method for Measuring the Phase-Transition Temperatures of Lipid Membranes. J. Exp. Theor. Phys. 127, 791–796 (2018). https://doi.org/10.1134/S1063776118100229

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  • DOI: https://doi.org/10.1134/S1063776118100229

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