Water Contact Angle Measurements
Water Contact Angle Measurements - 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.
09:08
Measuring Material Microstructure Under Flow Using 1-2 Plane Flow-Small Angle Neutron Scattering
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Cited by 27 •
2014
A shear cell is developed for small-angle neutron scattering measurements in the velocity-velocity gradient plane of shear and is used to characterize complex fluids. Spatially resolved measurements in the velocity gradient direction are possible for studying shear-banding materials. Applications include investigations of colloidal dispersions, polymer solutions, and self-assembled structures.
07:17
Measurement of Dynamic Force Acted on Water Strider Leg Jumping Upward by the PVDF Film Sensor
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Cited by 1 •
2018
The protocol here is dedicated to investigating the free and quick maneuvering of water strider on water surface. The protocol includes observing the microstructure of legs and measuring the adhesion force when departing from water surface at different speeds.
12:32
EPA Method 1615. Measurement of Enterovirus and Norovirus Occurrence in Water by Culture and RT-qPCR. Part III. Virus Detection by RT-qPCR
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Cited by 13 •
2016
Here we present a procedure to quantify enterovirus and norovirus in environmental and drinking waters using reverse transcription-quantitative PCR. Mean virus recovery from groundwater with this standardized procedure from EPA Method 1615 was 20% for poliovirus and 30% for murine norovirus.
FAQs
The measured angle is governed by the balance of interfacial tensions at the liquid-solid-gas boundary. That balance determines how far the water droplet spreads across the solid rather than remaining compact. Consequently, the value connects an observable droplet profile with surface wettability, allowing engineers to assess how a surface may interact with water.
A change in water contact angle can indicate a change in surface wettability, chemistry, or cleanliness. Smaller values correspond to stronger spreading, while larger values correspond to more limited spreading. Engineers can therefore use shifts in the measurement as practical evidence that a material surface or its treatment has altered how water interacts with it.
Surface cleanliness matters because the measurement can provide an indicator of whether the surface condition is consistent with its intended chemistry and performance. Contamination or an altered surface state may change water spreading and therefore the measured angle. In engineering evaluations, this makes the result useful for examining surface condition alongside coatings, treatments, or material performance.
A sessile-drop measurement places a water droplet on the solid material and captures its profile by imaging. Software then fits the droplet shape and calculates the angle at the liquid-solid-gas boundary. The resulting value provides a practical measurement of surface wettability that can be used to evaluate the tested material or surface condition.
Engineers apply these measurements when evaluating coatings, surface treatments, adhesion, printing, corrosion resistance, and biomedical materials. Each use connects water spreading with a particular surface-performance question. The measurement can help characterize whether a treated or engineered surface exhibits the wettability associated with its intended function, providing a practical indicator for material assessment.
The result translates droplet behavior into a measurable indicator of surface wettability, cleanliness, and chemistry. Engineers can use that information to assess whether a surface treatment or coating has produced the desired interaction with water and to examine relevance to adhesion, printing, corrosion resistance, or biomedical material performance. It therefore links surface characterization with engineering evaluation.