Organogel Formation Rationalized by Hansen Solubility Parameters: Shift of the Gelation Sphere with the Gelator Structure

Research output: Contribution to journalArticleScientificpeer-review

Researchers

  • Danilo Rosa Nunes

  • Manuel Reche-Tamayo
  • Emilie Ressouche

  • Matthieu Raynal
  • Benjamin Isare
  • Pascale Foury-Leylekian
  • Pierre Antoine Albouy
  • Patrick Brocorens
  • Roberto Lazzaroni
  • Laurent Bouteiller

Research units

  • CNRS
  • CNRS/IN2P3
  • Universite de Mons
  • University of Sorbonne

Abstract

To rationalize how the gelation ability of a low molecular weight gelator is influenced by its molecular structure, we performed extensive solubility tests of a group of thiazole-based gelators and made use of Hansen solubility parameter formalism. We observe that the increase of a linear alkyl chain in these gelators promotes an increase of the radius of the gelation sphere as well as a gradual shift of its center to lower values of the polar (δP) and hydrogen bonding (δH) components. The molecular packing within the fibers and the crystal habit were determined by a combination of X-ray diffraction and molecular modeling. We attribute the gradual and linear shift of the gelation sphere to the fact that all of the studied gelators share the same molecular packing, so that an increasing length of the alkyl chain reduces the proportion of polar groups at the surface, resulting in a gradual increase in the contact between apolar parts of the fiber and the solvent.

Details

Original languageEnglish
Pages (from-to)7970-7977
Number of pages8
JournalLangmuir
Volume35
Issue number24
Publication statusPublished - 18 Jun 2019
MoE publication typeA1 Journal article-refereed

ID: 35132579