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Hydrophobicity Control in Adaptive Crystalline Assemblies.

Erez Cohen1, Yahel Soffer1, Haim Weissman1

  • 1Department of Organic Chemistry, Weizmann Institute of Science, 234 Herzl Street, Rehovot, 7610001, Israel.

Angewandte Chemie (International Ed. in English)
|June 5, 2018
PubMed
Summary
This summary is machine-generated.

This study introduces a novel amphiphile forming ordered crystalline films. These films exhibit reversible switching between crystalline and amorphous states, with tunable hydrophobicity controlled by temperature.

Keywords:
crystalline assemblieshydrophobic effectperylene diimidesself-assemblysupramolecular materials

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Supramolecular Chemistry

Background:

  • Amphiphiles are molecules with both hydrophilic and hydrophobic parts, crucial for self-assembly.
  • Controlling material properties like crystallinity and wettability is key for advanced applications.
  • Polyethylene glycol (PEG) based materials offer tunable properties based on their phase transitions.

Purpose of the Study:

  • To synthesize and characterize a novel amphiphile based on PEG and specific molecular moieties.
  • To investigate the self-assembly behavior and film-forming properties of the synthesized amphiphile.
  • To explore the temperature-dependent reversible switching of film crystallinity and wettability.

Main Methods:

  • Synthesis of an amphiphile comprising polyethylene glycol (PEG), perylene diimide (PDI), and C7 fluoroalkyl (C7F) moieties.
  • Characterization of film formation and long-range order using appropriate analytical techniques.
  • Thermal analysis to determine phase transitions and study reversible switching behavior.
  • Contact angle measurements to quantify temperature-controlled wettability changes.

Main Results:

  • The amphiphile self-assembles into crystalline films with long-range order.
  • Films exhibit reversible switching from crystalline to amorphous states above the PEG melting temperature.
  • Hydrophobicity is tunable by heating, transitioning from highly hydrophobic to superhydrophilic states.
  • The adaptive behavior is attributed to the interplay between the responsive PEG domain and robust PDI/C7F assemblies.

Conclusions:

  • The developed amphiphile demonstrates potential as a building block for adaptive materials.
  • Reversible crystallinity switching and temperature-controlled wettability highlight the utility of polymeric/molecular hybrids.
  • This approach offers a pathway for designing smart materials with tunable surface properties.