Spin exchange and translational diffusion of nitroxide radicals in micelles. ESR experiments and spectra simulation by modified bloch equations.

スポンサーリンク

概要

• 論文の詳細を見る

• The dependence of the ESR linewidth of hydrophobic radicals on their concentration in micelles is investigated in two solubilization systems at several temperatures. One system consists of 2,2,6,6-tetramethyl-4-benzoyloxy-1-piperidinyloxyl (BzONO) as a solubilizate and hexadecyltrimethylammonium bromide (CTAB) as a surfactant, and the other, of 2,2,6,6-tetramethyl-4-myristoyloxy-1-piperidinyloxyl (MyONO) and sodium dodecyl sulfate (SDS). The plot of the linewidth against the mole fraction of the radical is not represented by a straight line, as in the previous study. The propriety of the two kinds of models for the solubilization states of radicals which were proposed in the previous paper to explain the unusual shape of these plots is examined by spectra simulation with modified Bloch equations. As these models have proved to be inadequate, a new model taking account of the distribution of the radicals among the micelles is proposed. The simulation based on this model shows a good agreement with the experimental results. The translational diffusion coefficients of radicals in micelles are estimated on the basis of this model. Their values are in the range of (1.5–2.9)×10<SUP>−11</SUP> m<SUP>2</SUP>/s.

• 公益社団法人 日本化学会の論文

著者

• Aizawa Masayuki

  Department Of Agricultural Chemistry The University Of Tokyo

• Komatsu Tsuyoshi

  Department of Polymer Science, Faculty of Science, Hokkaido University

• Nakagawa Tsurutaro

  Department of Polymer Science, Faculty of Science, Hokkaido University

関連論文

• Effect of Bound Phosphate on the Calcium-binding Ability and Calcium-dependent Precipitability of Human β-Casein(Food & Nutrition)
• The Heating-rate Dependence of the Mechanical Properties of Several Polymers at Higher Temperatures
• Complex formation of poly(acrylic acid) with lead(II) ion.
• A Torsional Braid Analysis of Polymethacrylates, Polyacrylate, Poly(vinyl alcohol), and Their Related Polymers during the Thermal Degradation
• Spin exchange and translational diffusion of nitroxide radicals in micelles. ESR experiments and spectra simulation by modified bloch equations.
• A Study of the Thermal Degradation of Several Halogen-containing Polymers by Torsional Braid Analysis
• Apparent Molal Volumes and Adiabatic Compressibilities of n-Alkanols and α,ω-Alkane Diols in Dilute Aqueous Solutions at 5, 25, and 45°C. I. Apparent Molal Volumes
• Study of metal-polycarboxylate complexes employing ion-selective electrodes. III. Complex formation between maleic acid copolymers and bivalent transition metal ions.

スポンサーリンク