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W/O microemulsions as model systems for the study of water confined in microenvironments: Low resolution 1H magnetic resonance relaxation analysis

  • D. Senatra
  • L. Lendinara
  • M. G. Giri
Microemulsions
Part of the Progress in Colloid & Polymer Science book series (PROGCOLLOID, volume 84)

Abstract

The properties of water confined in environments of low dimensionality were investigated by means of 1H magnetic resonance relaxation (NMRR) analysis. As “water-container”, a water-in-oil microemulsion, (n-hexadecane (O), K-oletae (S), n-hexanol (CoS), water (W)), was chosen because, differential scanning calorimetry (DSC) measurements showed that in this system several forms of water coexist, distinguished by the melting temperatures of 273 K “free water”, 263 K “interphasal water”, and 233 K “bound water”. — Two pairs of microemulsion systems were studied as a function of increasing water concentration (C, mass fraction), namely: (W/O, D2O/O) and (W/(deuterated oil)), (D2O/deuterated oil)). — The 1H spin-lattice and spin-spin relaxation curves were obtained at 20 MHz and 310 K. — A comparison between the trends of all best fit parameters, evaluated by two-and three-exponential analyses, was performed for both pairs of microemulsion systems.

Key words

Water/oil (W/O) microemulsion NMRR study water in microenvironments free water spin-lattice (longitudinal) relaxation spin-spin (transverse) relaxation 

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Copyright information

© Dr. Dietrich Steinkopff Verlag GmbH & Co. KG 1991

Authors and Affiliations

  • D. Senatra
    • 1
    • 2
  • L. Lendinara
    • 3
  • M. G. Giri
    • 1
    • 2
  1. 1.Department of PhysicsUniversity of FlorenceFlorenceItaly
  2. 2.INFM GroupItaly
  3. 3.Department of PhysicsUniversity of BolognaBolognaItaly

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