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Related Concept Videos

Adhesion01:14

Adhesion

45.6K
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.
Capillary action is a result of water’s adhesive tendencies. When a narrow...
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Passive Diffusion: Overview and Kinetics01:17

Passive Diffusion: Overview and Kinetics

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Passive diffusion is a critical process that allows small lipophilic drugs to cross the cell membrane along a concentration gradient. This mechanism's efficiency depends on four primary factors: the membrane's surface area, the drug's lipid-water partition coefficient, the concentration gradient, and the membrane's thickness.
When administered orally, drugs establish a substantial concentration gradient between the gastrointestinal (GI) lumen and the bloodstream, expediting...
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Rise of Liquid in a Capillary Tube01:18

Rise of Liquid in a Capillary Tube

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When very thin cylindrical tubes, called capillaries, are dipped in a liquid, the liquid rises or falls in the tube compared to the surrounding liquid. This phenomenon is called capillary action. Capillary action occurs due to the combination of two opposing forces: the cohesive forces of the liquid, which cause it to stick to itself and form a rounded shape, and the adhesive forces between the liquid and the walls of the container, which cause the liquid to be attracted to the container walls.
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Facilitated Transport01:19

Facilitated Transport

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The chemical and physical properties of plasma membranes cause them to be selectively permeable. Since plasma membranes have both hydrophobic and hydrophilic regions, substances need to be able to transverse both regions. The hydrophobic area of membranes repels substances such as charged ions. Therefore, such substances need special membrane proteins to cross a membrane successfully. In  facilitated transport, also known as facilitated diffusion, molecules and ions travel across a...
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Facilitated Transport01:19

Facilitated Transport

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The chemical and physical properties of plasma membranes cause them to be selectively permeable. Since plasma membranes have both hydrophobic and hydrophilic regions, substances need to be able to transverse both regions. The hydrophobic area of membranes repels substances such as charged ions. Therefore, such substances need special membrane proteins to cross a membrane successfully. In  facilitated transport, also known as facilitated diffusion, molecules and ions travel across a...
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Surface Tension, Capillary Action, and Viscosity02:57

Surface Tension, Capillary Action, and Viscosity

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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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Related Experiment Video

Updated: Apr 16, 2026

Taking Advantage of Reduced Droplet-surface Interaction to Optimize Transport of Bioanalytes in Digital Microfluidics
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Taking Advantage of Reduced Droplet-surface Interaction to Optimize Transport of Bioanalytes in Digital Microfluidics

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Controlled droplet transport on a gradient adhesion surface.

Shile Feng1, Sijie Wang, Chengcheng Liu

  • 1Key Laboratory of Bio-Inspired Smart Interfacial Science and Technology of Ministry of Education, School of Chemistry and Environment, Beihang University, Beijing, 100191, P. R. China. zhengym@buaa.edu.cn houyongping09@buaa.edu.cn.

Chemical Communications (Cambridge, England)
|March 6, 2015
PubMed
Summary
This summary is machine-generated.

Researchers created a novel surface with tunable adhesion using anodic oxidation and octafluorocyclobutane plasma. This surface enables controlled droplet transport via tilting or vibration, demonstrating advanced surface engineering capabilities.

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Measuring the Interaction Force Between a Droplet and a Super-hydrophobic Substrate by the Optical Lever Method
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Creating Adhesive and Soluble Gradients for Imaging Cell Migration with Fluorescence Microscopy
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Measuring the Interaction Force Between a Droplet and a Super-hydrophobic Substrate by the Optical Lever Method
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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Fluid Dynamics

Background:

  • Controlling surface adhesion is crucial for various applications, including microfluidics and self-cleaning surfaces.
  • Existing methods often lack continuous control over adhesion properties.

Purpose of the Study:

  • To fabricate a surface with a continuously tunable adhesion gradient.
  • To demonstrate controlled droplet transport on this engineered surface.

Main Methods:

  • Integrated fabrication using anodic oxidation and octafluorocyclobutane (C4F8) plasma.
  • Characterization of the adhesion gradient across the surface.
  • Experimental observation of droplet behavior under external stimuli.

Main Results:

  • Successfully created a surface exhibiting adhesion ranging from ultrahigh to ultralow.
  • Achieved directional control of droplet transport along the adhesion gradient.
  • Demonstrated that droplet movement can be precisely controlled by adjusting the surface's tilted angle or vibration frequency.

Conclusions:

  • The developed integrated method provides a robust platform for creating tunable adhesion surfaces.
  • This technology offers new possibilities for manipulating liquid behavior in microscale systems.
  • The ability to control droplet transport opens avenues for advanced lab-on-a-chip devices and responsive materials.