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Physics and Astrophysics Research Seminar Series

Lateral Adhesion Forces at Liquid-Solid Interfaces

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Seminars

As part of the School of Science and Technology's Physics and Astrophysics Research Seminar Series, Nan Gao, University of Birmingham presents: Lateral Adhesion Forces at Liquid-Solid Interfaces.

  • From: Monday 13 January 2020, 12 pm
  • To: Monday 13 January 2020, 1 pm
  • Location: ERD 193, Erasmus Darwin, Nottingham Trent University, Clifton Campus, Clifton Lane, Nottingham, NG11 8NS
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Event details

As part of the School of Science and Technology's Physics and Astrophysics Research Seminar Series, Nan Gao, University of Birmingham presents: Lateral Adhesion Forces at Liquid-Solid Interfaces.

Abstract

It has been known for more than 200 years that the maximum static friction force between two solid surfaces is usually greater than the kinetic friction force—the force that is required to maintain the relative motion of the surfaces once the static force has been overcome. But the forces that impede the lateral motion of a drop of liquid on a solid surface are not as well characterized, and there is a lack of understanding about liquid–solid friction in general.


Using a laser deflection system we investigate lateral adhesion forces at liquid-solid interfaces. Our set-up consists of a laser, a deflectable capillary, and a position sensitive detector (PSD). Drops of liquid are moved laterally against solid substrates using the deflectable capillary. A laser beam incident on the capillary is reflected to the PSD, which instantly generates electric signals according to the lateral adhesion forces. With assistance of optical imaging, we have been able to resolve the drop motion synchronised to the force measurement.


Our results have demonstrated that the instantaneous lateral adhesion forces at the liquid-solid interfaces are determined by the front and rear contact angles as well as the contact width. More importantly, we report that the lateral adhesion force between a liquid drop and a solid can also be divided into a static and a kinetic regime. This striking analogy with solid–solid friction is a generic phenomenon that holds for liquids of different polarities and surface tensions on smooth, rough and structured surfaces.

This seminar is hosted by Ian Shuttleworth

All Welcome

For any enquires please contact Ian Shuttleworth

Location details

Room/Building:

ERD 193, Erasmus Darwin

Address:

Nottingham Trent University
Clifton Campus
Clifton Lane
Nottingham
NG11 8NS

Past event

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