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Evaluation of the Distribution in Mesopores of ODS-Silica Gel in Alcohol-Water Solvent by Absorption Microspectroscopy

  • KAKIZAKI Hiroshi
    Department of Chemistry, Graduate School of Pure and Applied Sciences, University of Tsukuba
  • NAKATANI Kiyoharu
    Department of Chemistry, Graduate School of Pure and Applied Sciences, University of Tsukuba

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Other Title
  • 顕微吸光法によるアルコール‐水系におけるオクタデシルシリルシリカゲル細孔内分配過程の評価
  • 顕微吸光法によるアルコール-水系におけるオクタデシルシリルシリカゲル細孔内分配過程の評価
  • ケンビキュウコウホウ ニ ヨル アルコール スイケイ ニ オケル オクタデシルシリル シリカゲルサイコウ ナイ ブンパイ カテイ ノ ヒョウカ

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The sorption of phenol blue (PB), known as a solvatochromic dye, from an alcohol (methanol, ethanol, butanol or pentanol)-water mixture solvent into single spherical octadecylsilyl (ODS)-silica gel microparticles {particle diameter (d) of 20 ~ 60 μm, pore diameter of 12 nm} was investigated by absorption microspectroscopy. For ~ 0.5 vol% pentanol, ~ 0.5 vol% butanol or 1 vol% ethanol, the adsorption coefficient of PB in a single microparticle (Kads), determined on the basis of the Langmuir isotherm, was much smaller than that for water although the relative permittivity of the mixture solvent was almost the same as that of water. Furthermore, the absorption maximum of PB in the microparticle (λmax) for the mixture solvent was slightly shifted from that for water. For 1 vol% methanol, both λmax and Kads did not change compared with those for water. The results showed that for a mixture solvent of pentanol, butanol or ethanol the microscopic polarity in the ODS phase was larger and the polarity and hydrogen bonding in the vicinity of the ODS/solution interface were smaller than those for water because the alcohol molecules with the long alkyl chain length distributed in the ODS phase. Concerning the volume percentage of alcohol greater than ~ 5 vol%, on the other hand, λmax and Kads significantly decreased with the increasing volume percentage of alcohol, revealing a decrease in the relative permittivity of the mixture solvent as well as changes in the microscopic polarity and hydrogen bonding.<br>



    BUNSEKI KAGAKU 54 (6), 479-483, 2005

    The Japan Society for Analytical Chemistry

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