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Related Concept Videos

Surface Tension of Fluid01:22

Surface Tension of Fluid

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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.
Surface tension varies...
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Theories of Dissolution: The Danckwerts' Model and Interfacial Barrier Model01:09

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Various dissolution theories provide insight into the factors that influence the dissolution rate. Danckwerts' Model suggests that turbulence, rather than a stagnant layer, characterizes the dissolution medium at the solid-liquid interface. In this model, the agitated solvent contains macroscopic packets that move to the interface via eddy currents, facilitating the absorption and delivery of the drug to the bulk solution. The regular replenishment of solvent packets maintains the...
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Surface Tension, Capillary Action, and Viscosity02:57

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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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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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In precipitation gravimetry, the precipitating agent should react specifically or selectively with the analyte. While a specific reagent reacts with the analyte alone, a selective reagent can react with a limited number of chemical species.
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Updated: Aug 6, 2025

Taking Advantage of Reduced Droplet-surface Interaction to Optimize Transport of Bioanalytes in Digital Microfluidics
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Interfacial Features Govern Nanoscale Jumping Droplets.

Kimia Montazeri1, Penghui Cao1, Yoonjin Won1,2

  • 1Department of Mechanical and Aerospace Engineering, University of California Irvine, Irvine, California 92697, United States.

Langmuir : the ACS Journal of Surfaces and Colloids
|March 17, 2023
PubMed
Summary
This summary is machine-generated.

Surface nanostructure engineering controls nanodroplet motion. Tailoring surface profiles and forces enables creeping, rolling, and jumping droplet behaviors for advanced applications.

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High Throughput Analysis of Liquid Droplet Impacts
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Area of Science:

  • Surface science
  • Nanotechnology
  • Fluid dynamics

Background:

  • Surface topography significantly influences liquid-solid interactions and droplet dynamics.
  • Controlling droplet motion is crucial for various applications, from microfluidics to self-cleaning surfaces.

Purpose of the Study:

  • To demonstrate a method for manipulating nanodroplet motion by engineering surface morphology.
  • To investigate the relationship between surface profile, applied forces, and droplet dynamic behaviors.

Main Methods:

  • Simulating water molecule trajectories at the liquid-solid interface.
  • Analyzing nanodroplet motion under varying lateral forces and surface profiles.
  • Utilizing computational simulations to develop a predictive regime map.

Main Results:

  • Identified three distinct nanodroplet motion modes: creeping, rolling, and jumping.
  • Discovered that elastic deformation and receding contact angle changes drive droplet jumping.
  • Constructed a regime map correlating surface profile, applied force, and motion mode.

Conclusions:

  • Surface engineering through nanostructured features offers precise control over nanodroplet motion.
  • The developed regime map provides a design strategy for manipulating droplet dynamics via surface morphology.
  • Understanding these mechanisms is key to designing advanced surfaces for controlled liquid transport.