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Area of Science:

  • Supramolecular Chemistry
  • Materials Science
  • Rheology

Background:

  • Understanding gelator mixtures is key to designing novel materials.
  • Bisamide gelators offer tunable properties based on spacer length.
  • Hydrogen bonding interactions influence self-assembly.

Purpose of the Study:

  • To establish design rules for binary gelator mixtures.
  • To correlate supramolecular assembly patterns with rheological properties.
  • To investigate the impact of parity and spacer length on gelator behavior.

Main Methods:

  • Synthesis and blending of nBA gelators with varying methylene spacer lengths (n=5-10).
  • Analysis of solid-state and gel-state assembly using microscopy and rheological measurements.
  • Systematic variation of gelator ratios and parities.

Main Results:

  • Binary gelator mixtures exhibit assembly behavior consistent in solid and gel states.
  • Co-assembly into fibers or sheets observed for mixtures differing by two methylene units.
  • Phase separation occurs in mixtures of different parities or same parity with larger spacer differences.
  • Even-even gels (sheets) show higher storage modulus (G') than odd-odd gels (fibers).
  • Self-sorting into discrete structures generally decreases G', except for specific cases like (5BA)1(9BA)1.

Conclusions:

  • Spacer length and parity critically dictate binary gelator assembly and phase behavior.
  • Supramolecular architecture directly influences the rheological properties of the resulting gels.
  • Design rules for binary gelator mixtures can be derived from parity and spacer length.