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Supramolecular Gels with Potential Applications as Anti-Icing Agents.

Nicole K McLeod1,2, Lee Stokes2, Jerry Lewis2

  • 1Department of Chemistry, University of York, Heslington, York YO10 5DD, U.K.

Langmuir : the ACS Journal of Surfaces and Colloids
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Summary
This summary is machine-generated.

Modified supramolecular gels effectively thicken aircraft deicing fluids. DBS-SCH3 gels at lower concentrations, enhancing fluid performance and holdover times for next-generation anti-icing systems.

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Area of Science:

  • Materials Science
  • Supramolecular Chemistry
  • Rheology

Background:

  • Supramolecular gels based on 1,3:2,4-dibenzylidenesorbitol (DBS) derivatives are explored as potential thickeners.
  • These gels show promise for applications in anti-icing fluids, particularly for aviation.
  • Modifications on the aromatic rings of DBS influence gel properties and performance.

Purpose of the Study:

  • To investigate the efficacy of various DBS derivatives as thickeners for monopropylene glycol (MPG) and water mixtures.
  • To evaluate the performance of these supramolecular gels in aviation deicing fluids.
  • To understand the relationship between gelator structure, formulation, and anti-icing properties.

Main Methods:

  • Synthesis and testing of a range of DBS derivatives.
  • Gelation studies in MPG/water mixtures at varying concentrations and water content.
  • Rheological measurements to assess gel stiffness and thermal stability.
  • Performance evaluation in a commercial deicing fluid using water spray endurance tests.

Main Results:

  • DBS, DBS-OCH3, and DBS-SCH3 demonstrated effective thickening properties.
  • DBS-SCH3 achieved gelation at significantly lower concentrations (<0.1 wt%/vol) compared to DBS and DBS-OCH3.
  • Increased water content in MPG generally enhanced gelation and thermal stability, up to a critical point.
  • The gels formed nanoscale fibrillar networks (5-10 nm diameter).
  • In deicing fluid tests, DBS additives improved performance and extended holdover times, with increased holdover observed upon fluid dilution.

Conclusions:

  • Modified DBS derivatives are effective low molecular weight gelators (LMWGs) for anti-icing fluid formulations.
  • DBS-SCH3 offers superior efficiency due to its low critical gelation concentration.
  • The supramolecular gels enhance deicing fluid performance and holdover times, potentially allowing for reduced MPG usage.
  • These LMWGs represent a promising additive for developing advanced anti-icing systems.