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Inkjet-printed Polyvinyl Alcohol Multilayers
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Inkjet-printed Polyvinyl Alcohol Multilayers

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Adhesion and anti-adhesion of viscous fluids on solid surfaces--a study of ink transfer mechanism in waterless offset

Wei Shen1, Yu Mao, Gerard Murray

  • 1Department of Chemical Engineering, Monash University, Clayton Campus, P.O. Box 36, VIC 3800, Australia. wei.shen@eng.monash.edu.au

Journal of Colloid and Interface Science
|November 13, 2007
PubMed

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Capillarity describes the movement of liquid in small spaces without external forces acting on it. The capillarity is driven by surface tension and adhesive interactions between the liquid and surrounding solid surfaces. This effect is often seen in narrow tubes, porous materials, and fine particles.
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When water is poured into a glass, it falls freely and quickly, whereas if honey or maple syrup is poured over a pancake, it flows slowly and sticks to the surface of the container. This difference in the flow of different kinds of liquids arises due to the fluid friction between the liquid layers and the liquid and the surrounding material. This property of fluids is called fluid viscosity. In this example, water has a lower viscosity than honey and maple syrup.
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Surface Tension of Fluid

Surface tension is a fundamental property of fluids, occurring at the boundary between a liquid and a gas or between two immiscible liquids. This phenomenon arises from the cohesive forces between molecules at the fluid's surface, creating an effect similar to a stretched elastic membrane. Inside each fluid, molecules are equally attracted in all directions by neighboring molecules, but surface molecules experience a net inward force, resulting in surface tension.
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