Contact Resistance
Contact Resistance - 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...
11:13
Analysis of Contact Interfaces for Single GaN Nanowire Devices
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Cited by 1 •
2013
A technique was developed that removes Ni/Au contact metal films from their substrate to allow for the examination and characterization of the contact/substrate and contact/NW interfaces of single GaN nanowire devices.
09:45
Monolayer Contact Doping of Silicon Surfaces and Nanowires Using Organophosphorus Compounds
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Cited by 9 •
2013
A detailed procedure for surface doping of Silicon interfaces is provided. The ultra-shallow surface doping is demonstrated by using phosphorus containing monolayers and rapid annealing process. The method can be used for doping of macroscopic area surfaces as well as nanostructures.
06:30
Bioassays for Monitoring Insecticide Resistance
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Cited by 45 •
2010
This manuscript demonstrates and discusses techniques used to survey pesticide susceptibility and detect resistance to contact and systemic pesticides in arthropod pests.
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.
FAQs
Microscopic surface roughness means that two apparently matching conductors touch only at limited real contact spots. Current therefore concentrates through those smaller regions instead of spreading across the full visible interface. This current crowding increases localized electrical loss and can create heat, making surface condition an important design consideration for reliable conductive connections.
Oxide films and contamination introduce additional barriers between conductive surfaces, reducing the effectiveness of the available contact spots. Their presence can raise interface losses even when the contacting components appear physically joined. Engineers therefore consider surface cleanliness and treatments when seeking stable electrical performance in connectors, switches, sensors, batteries, and power electronics.
Contact force changes how effectively the mating surfaces engage at their microscopic high points. Appropriate pressure can improve the conductive connection, while an unsuitable condition can leave interface losses high. Because resistance also depends on material properties and surface condition, engineers evaluate force together with those variables rather than treating pressure as an isolated solution.
Even a small resistance at a conductive interface can produce heat during operation and reduce the quality of an electrical signal. Repeated or sustained losses can therefore affect efficiency, measurement accuracy, and device reliability. This makes contact resistance relevant not only to power delivery, but also to low-loss signal paths and precise sensing systems.
Engineers analyze contact resistance during the design and testing of components that depend on conductive interfaces. They examine the effects of surface roughness, oxide films, contamination, contact force, and material properties, then relate those factors to electrical losses, heat, signal quality, and reliability. This evaluation helps identify whether the interface can meet the intended performance requirements.
Connectors and switches require controlled interfaces to preserve efficient current flow and dependable operation. Sensors can be affected when interface losses reduce measurement accuracy, while batteries and power electronics can experience efficiency and reliability limitations. Across these applications, suitable materials, surface treatments, pressure, and maintenance help control losses and support long-term performance.