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Related Concept Videos

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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.
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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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Surface Tension
The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...
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Adhesion01:14

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Adhesion occurs when one type of molecule is attracted to a different molecule. Water exhibits adhesive properties in the presence of polar surfaces, such as glass or cellulose in plants. For instance, when water is poured into a glass, the positively charged hydrogen molecules of water are more attracted to the negatively charged oxygen molecules in the silica than to the oxygen in neighboring water molecules.
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When a body is in motion, it encounters resistance because the body interacts with its surroundings. This resistance is known as friction, a common yet complex force whose behavior is still not completely understood. Friction opposes relative motion between systems in contact, but also allows us to move. Friction arises in part due to the roughness of surfaces in contact. For one object to move along a surface, it must rise to where the peaks of the surface can skip along the bottom of the...
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Viscosity01:17

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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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How solid-liquid adhesive property regulates liquid slippage on solid surfaces?

Yahui Xue1, Yang Wu, Xiaowei Pei

  • 1State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences , Lanzhou, Gansu 730000, China.

Langmuir : the ACS Journal of Surfaces and Colloids
|December 17, 2014
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Summary
This summary is machine-generated.

Liquid slippage at solid surfaces is influenced by solid-liquid adhesion. A new model links liquid slip length to adhesive force, showing an exponential decay, confirmed by experiments.

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Area of Science:

  • Surface Science
  • Fluid Dynamics
  • Materials Science

Background:

  • Liquid slippage at solid surfaces is crucial for microfluidics and nanotechnology.
  • Understanding the relationship between surface adhesion and slip is key to controlling fluid behavior at the nanoscale.

Purpose of the Study:

  • To investigate the influence of solid-liquid adhesive properties on liquid slippage.
  • To develop a theoretical model correlating liquid slip length with adhesive forces.
  • To experimentally validate the theoretical model using well-defined surfaces.

Main Methods:

  • Fabrication of well-defined smooth surfaces with tunable wettability using self-assembled monolayers on gold.
  • Measurement of liquid adhesive force using Surface Force Apparatus (SFA).
  • Probing molecular slippage using Quartz Crystal Microbalance (QCM) measurements.

Main Results:

  • A simple theoretical model was developed, predicting an exponential decay relationship between liquid slip length and liquid adhesive force.
  • Experimental results using varied surface wettability (hydrophobic/hydrophilic thiols) demonstrated excellent agreement with the theoretical predictions.
  • Demonstrated control over liquid slippage by tuning surface adhesive properties.

Conclusions:

  • Solid-liquid adhesive property significantly influences liquid slippage at solid surfaces.
  • The developed theoretical model provides a fundamental understanding of the molecular mechanisms governing liquid slip.
  • Findings enable the rational design of microfluidic devices for frictionless or highly controllable fluid transport.