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Picoliter water contact angle measurement on polymers
Michael Taylor1, Andrew J Urquhart, Mischa Zelzer
1Laboratory of Biophysics and Surface Analysis, Department of Pharmaceutical Sciences, University of Nottingham, University Park, Nottingham, U.K.
Langmuir : the ACS Journal of Surfaces and Colloids
|May 17, 2007
Summary
Researchers developed a new dosing system for precise picoliter droplets, enabling accurate material wettability measurements. This technique overcomes limitations of conventional methods, offering higher spatial resolution for detailed surface analysis.
Area of Science:
- Materials Science
- Surface Chemistry
- Physical Chemistry
Background:
- Water contact angle measurement is standard for assessing material wettability.
- The sessile drop method is common but typically limited to macroscopic scales (>1 mm droplet diameter).
- Existing methods lack the resolution for fine-scale wettability characterization.
Purpose of the Study:
- To introduce a novel dosing system for dispensing picoliter-volume droplets with positional control.
- To compare water contact angles measured with picoliter droplets against conventional microliter droplets.
- To demonstrate enhanced spatial resolution in wettability mapping using picoliter droplets.
Main Methods:
- Development of a precise dosing system for controlled picoliter droplet dispensing.
- Application of the sessile drop method using both picoliter and microliter water droplets.
- Wettability mapping of a radial plasma polymer gradient using a 250 µm interval grid.
Main Results:
- Picoliter droplet contact angles are comparable to those from microliter droplets on common polymers.
- The new system allows for precise control over droplet volume and position.
- High-resolution wettability mapping revealed detailed surface variations.
Conclusions:
- Picoliter droplet-based contact angle measurements provide reliable and comparable wettability data.
- The developed dosing system enables high-spatial-resolution wettability analysis.
- This technique significantly advances the ability to characterize fine-scale surface properties.
