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Measuring wettability of biosurfaces at the microscale
Conrado Aparicio1, Yassine Maazouz, Dehua Yang
1Department of Restorative Sciences, Minnesota Dental Research Center for Biomaterials and Biomechanics, School of Dentistry, University of Minnesota, Minneapolis, MN, USA. apari003@umn.edu
Methods in Molecular Biology (Clifton, N.J.)
|November 2, 2011
Summary
A novel microscopic contact angle meter enables precise surface wettability analysis at the micro/nanoscale. This advanced tool overcomes limitations of traditional methods, offering detailed insights into small-scale surface properties for biosensors and biomaterials.
Area of Science:
- Materials Science
- Surface Chemistry
- Biomaterials Engineering
Background:
- Surface wettability is crucial for material performance and is typically measured using contact angle goniometry.
- Conventional macroscopic contact angle meters use large liquid droplets (microliters), limiting analysis to bulk properties.
- Assessing wettability at micro/nanoscale features is essential for advanced applications like biosensors and patterned surfaces.
Purpose of the Study:
- To introduce and validate a novel microscopic contact angle meter for precise wettability assessment.
- To demonstrate the capability of microscopic contact angle measurements on various biosurfaces.
- To provide a protocol for using microscopic contact angle meters, highlighting key methodological differences from macroscopic techniques.
Main Methods:
- Utilizing a microscopic contact angle meter with a pneumatic injection system to dispense picoliter-to-femtoliter volume droplets (10⁻³–10⁻⁵ μL).
- Employing a capillary with micrometer internal diameter and a high-resolution, ultrafast digital camera for drop profile imaging.
- Testing diverse biosurfaces including microimprinted polymers, calcium-phosphate cements, and orthodontic wires.
Main Results:
- The microscopic contact angle meter successfully measured wettability on micro/nanoscale features of tested biosurfaces.
- Demonstrated applicability for analyzing microimprinted polymers for biosensors, topographical features of calcium-phosphate cements, and orthodontic wires.
- Highlighted the advantages over macroscopic methods for localized surface characterization.
Conclusions:
- Microscopic contact angle measurements offer unprecedented resolution for surface wettability analysis.
- This technique is vital for characterizing advanced materials and devices with micro/nanoscale features.
- The developed protocol facilitates the adoption of microscopic contact angle goniometry in research and technological fields.
