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Related Concept Videos

Contact Angle01:13

Contact Angle

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When a solid is dipped inside a liquid, the liquid surface becomes curved near the contact. For some solid–liquid interfaces, the liquid is pulled up along the solid, while for others, the liquid surface is convex or depressed near the solid surface. This phenomenon can be explained using the concept of cohesive and adhesive forces.
The adhesive force is the molecular force between molecules of different materials, that is, between the molecules of the solid and the liquid. The cohesive...
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Contact Angle Mapping Using Microdroplets.

Benjamin Thorne1, Jianping Xu1, Sharath Chandra Mahavadi2

  • 1School of Engineering and Applied Science, Harvard University, Cambridge, Massachusetts 02138, United States.

Langmuir : the ACS Journal of Surfaces and Colloids
|August 6, 2025
PubMed
Summary
This summary is machine-generated.

This study introduces a new goniometer for precise microscale contact angle measurements. The device maps surface wettability with high resolution, aiding applications from carbon sequestration to antibiotic efficacy.

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Area of Science:

  • Surface science
  • Materials science
  • Fluid dynamics

Background:

  • Heterogeneous surfaces present challenges for conventional contact angle measurements.
  • Existing microcontact angle methods lack sufficient spatial resolution or rely on indirect measurements.

Purpose of the Study:

  • To develop a novel contact angle mapping goniometer for high-resolution wettability characterization.
  • To quantify apparent contact angles and contact angle hysteresis on microscale surfaces.

Main Methods:

  • Utilizing a novel goniometer to deposit picoliter droplets.
  • Achieving spatial resolution as low as tens of microns for contact angle mapping.
  • Validating the device on test surfaces and natural samples.

Main Results:

  • Demonstrated ability to visualize and quantify apparent contact angles and hysteresis.
  • Successfully applied to tertiary basalt samples for geological carbon sequestration studies.
  • Examined wettability of *Bacillus subtilis* biofilms and its impact on antibiotic efficacy.

Conclusions:

  • The developed goniometer offers a significant advancement in microscale surface wettability analysis.
  • Provides critical insights into surface properties for diverse applications, including energy and medicine.
  • Enhances understanding of fluid-surface interactions on heterogeneous materials.