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Changing surface hydro- and oleophobicity with resorcinarene multilayers-a simple water/oil proofing process
Frank Davis1, Elaine Frary, Charles J M Stirling
1Institute of Bioscience and Technology, Cranfield University at Silsoe, Silsoe, MK45 4DT United Kingdom. f.davis@cranfield.ac.uk
Langmuir : the ACS Journal of Surfaces and Colloids
|October 6, 2004
Summary
Resorcinarenes, or resorcinol-aldehyde tetramers, can alter surface properties by attaching to hydrophilic surfaces. These molecules create hydrophobic or oleophobic surfaces with minimal material, impacting liquid penetration.
Area of Science:
- Supramolecular Chemistry
- Materials Science
- Surface Science
Background:
- Resorcinarenes are bowl-shaped molecules formed from resorcinol and aldehydes.
- These compounds can interact with and modify the properties of various surfaces.
Purpose of the Study:
- To investigate the ability of resorcinarenes to alter surface hydrophilicity and oleophilicity.
- To understand the mechanism of surface modification by resorcinarenes.
- To explore the impact of modified surfaces on liquid penetration.
Main Methods:
- Treatment of various surfaces with resorcinarenes at low concentrations (2-10 mg m(-2)).
- Characterization of surface properties (hydrophilicity/oleophilicity).
- Study of liquid penetration into treated surfaces.
Main Results:
- Resorcinarenes effectively change surface properties from hydrophilic to hydrophobic or oleophobic.
- Attachment occurs via the rim of the bowl-shaped molecules to hydrophilic surfaces.
- Low treatment amounts are sufficient, with evidence of multilayer formation.
- Liquid penetration is not easily explained by density, viscosity, or surface tension alone.
Conclusions:
- Resorcinarenes offer a versatile method for tuning surface properties.
- The molecular structure of resorcinarenes dictates the resulting surface characteristics.
- Further research is needed to fully understand liquid-surface interactions on modified materials.