Recent Trend of Organogelators and Their Applications

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  • HANABUSA Kenji
    Interdisciplinary Graduate School of Science and Technology Shinshu University

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  • オイルゲル化剤の最近の展開と応用
  • オイルゲルカザイ ノ サイキン ノ テンカイ ト オウヨウ

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Description

Recent trend of organogelators and their applications were described. The relationship between physical gelation of solutions and crystallization was explained. Crystallization is a phenom enon that crystals are separated from solution by completely three-dimensional arrangement of solute through intermolecular interactions. On the other hand, physical gelation is caused by trapping solvent in fibrous networks which are formed by gelator molecules through intermolecular interactions. Driving forces for both gelation and crystallization are cooperating noncovalent interactions, such as hydrogen bondings, van der Waals interaction, electrostatic interaction, and π-π interaction. <br/>New concept “gelation-driving segments” was proposed. On the basis of the concept, many functional gelators can be prepared easily from gelation-driving segments. <br/>Gelators forming semi-permanent stable gels were developed by using polymers and oligomers, which do not precipitate as crystals from the solutions because of their molecular weight distribution and movement of flexible chains. Polymer type of gelators forming stable gels were synthesized by connecting gelation-driving segments onto polymers or oligomers. Gelation behavior was studied in detail in the three component mixed solvents composed of glyceride as polar solvent, liquid paraffin as non-polar solvent, and decamethylcyclopentasiloxane as silicone oil. <br/>Finally, gelation-driving segment was prepared and the specific was studied.

Journal

  • Oleoscience

    Oleoscience 13 (2), 67-72, 2013

    Japan Oil Chemists' Society

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