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Updated: Aug 1, 2025
10:52
Preparation and High-temperature Anti-adhesion Behavior of a Slippery Surface on Stainless Steel
Published on: March 29, 2018
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Advances and challenges in slippery covalently-attached liquid surfaces
Isaac J Gresham1, Chiara Neto1
1School of Chemistry and the University of Sydney Nano Institute, The University of Sydney, NSW Australia, Sydney 2006, NSW, Australia.
Advances in Colloid and Interface Science
|April 26, 2023
Summary
Slippery covalently-attached liquid surfaces (SCALS) offer anti-adhesive properties but their design is hindered by unknown characteristics. This review analyzes SCALS data, finding optimal parameters for reduced contact angle hysteresis (CAH).
Area of Science:
- Surface science
- Materials chemistry
- Nanotechnology
Background:
- Slippery covalently-attached liquid surfaces (SCALS) are nanoscale materials with low contact angle hysteresis (CAH < 5°).
- SCALS mimic lubricant-infused surfaces, providing droplet mobility and preventing icing, scaling, and fouling.
- Current SCALS primarily use polydimethylsiloxane (PDMS), with some examples using polyethylene oxide (PEO), perfluorinated polyether (PFPE), and alkanes.
Purpose of the Study:
- To quantitatively analyze reported SCALS data to understand the physico-chemical characteristics enabling ultra-low CAH.
- To identify trends and optimal parameters for the rational design of SCALS.
- To review synthetic and functional aspects of SCALS preparation methods.
Main Methods:
- Comparative analysis of reported CAH, molecular weight, grafting density, and layer thickness for various SCALS.
- Quantitative analysis of existing literature data on SCALS properties.
- Review of preparative methods for SCALS.
Main Results:
- CAH does not scale monotonically with reported parameters; minimum CAH occurs at intermediate values.
- Optimal PDMS SCALS exhibit an advancing contact angle of 106°, molecular weight of 2-10 kg mol⁻¹, and grafting density of ~0.5 nm⁻².
- End-grafted chains and increased chemical homogeneity (capped silanols) correlate with lower CAH.
Conclusions:
- Understanding SCALS' optimal parameters is crucial for rational design.
- Further experimental studies are needed to explore trends and refine SCALS properties.
- SCALS represent a promising class of anti-adhesive surfaces with broad applications.
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