Water Contact Angle
Water Contact Angle - Related Videos
01:13
Contact Angle
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2023
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 force...
08:53
Angle-resolved Photoemission Spectroscopy At Ultra-low Temperatures
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Cited by 8 •
2012
The overall goal of this method is to determine the low-energy electronic structure of solids at ultra-low temperatures using Angle-Resolved Photoemission Spectroscopy with synchrotron radiation.
03:55
Larval Contact Assay: A Procedure to Evaluate Mosquito Larval Mortality following Direct Contact with Test Larvicidal Compound
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2025
In this video, we describe the larval contact assay to evaluate the toxicity of the dopamine receptor antagonist amitriptyline on the third instar stage larvae of mosquitoes, known vectors of several human infectious diseases. Assessing the larval mortality upon incubation with different amitriptyline concentrations over different time intervals helps determine its lethal concentration 50.
08:25
Contact Hypersensitivity as a Murine Model of Allergic Contact Dermatitis
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Cited by 2 •
2022
Contact hypersensitivity (CHS) is a murine experimental model of allergic contact dermatitis (ACD). CHS is based on sensitization with reactive hapten by painting the shaved skin of the chest and abdomen, with a subsequent ear skin challenge with a diluted hapten, causing a swelling reaction that is assessed in various ways.
10:04
Visualizing Soil Microorganisms via the Contact Slide Assay and Microscopy
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2023
Source: Laboratories of Dr. Ian Pepper and Dr. Charles Gerba - The University of Arizona Demonstrating Author: Bradley Schmitz Soil comprises the thin layer at the earth’s surface, containing biotic and abiotic factors that contribute to life. The abiotic portion includes inorganic particles ranging in size and shape that determine the soil’s texture. The biotic portion incorporates plant residues, roots, organic matter, and microorganisms. Soil microbe abundance and diversity is expansive, as...
FAQs
At the droplet boundary, cohesion within water competes with adhesion between water and the solid, while the surrounding air also contributes to the interface. The balance determines whether water spreads across the surface or remains more localized. Measuring the resulting angle gives researchers a practical way to compare interfacial behavior among biomaterials, coatings, and other engineered surfaces.
Changes in surface chemistry alter the interaction between water and the solid, which can shift the measured angle toward greater or lesser wettability. Surface treatments therefore provide a way to modify interfacial behavior deliberately. Comparing measurements across differently treated materials helps bioengineers evaluate whether a coating or modification produces the surface characteristics needed for a particular application.
Surface roughness can influence the measured response alongside surface chemistry, so the angle should not be interpreted as a chemical property alone. Two materials with different surface textures may show different wettability behavior even when their chemical compositions are similar. Considering roughness helps researchers relate measurements more accurately to biomaterial performance and surface treatment effects.
Wettability provides surface information that can help explain how a biomaterial interacts with its biological environment. Because contact-angle measurements reveal effects associated with surface chemistry and roughness, they can support evaluation of conditions related to protein adsorption and cell attachment. This makes the measurement useful when comparing candidate surfaces for bioengineering designs that require controlled biological interactions.
Researchers can measure the angles of different biomaterials, coatings, or implant surfaces and use the results to compare their relative interfacial behavior. The measurements help identify how surface chemistry, roughness, or treatment changes wettability across candidate materials. These comparisons support surface selection and optimization when designing components intended for biomedical or other bioengineering applications.
In microfluidic devices, contact-angle data help characterize surface behavior relevant to fluid transport. For biosensors, the same measurements provide information about the engineered surface and its interaction with water, supporting evaluation of surface treatments and material choices. Together with related analyses of chemistry and roughness, the results help guide designs for controlled interfacial performance.