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Related Concept Videos

Viscosity01:17

Viscosity

6.9K
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.
The SI unit of viscosity is...
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Viscosity of Fluid01:19

Viscosity of Fluid

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Viscosity measures the resistance a fluid offers to flow and deformation. It results from internal friction between layers of fluid moving relative to one another. Dynamic viscosity, denoted by the Greek letter mu (μ), quantifies the force needed to move one fluid layer over another. For Newtonian fluids like water and air, the relationship between the shearing stress and the rate of shearing strain is linear, meaning their viscosity remains constant regardless of the applied stress.
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Characteristics of Fluids01:20

Characteristics of Fluids

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When a force is applied parallel to the top surface of a solid, it resists the applied force due to the internal frictional forces between the layers of the solid known as shearing resistance. However, when the force is removed, the shearing forces restore the original shape of the solid. Other deformation forces also cause temporary changes in shape if the forces are not beyond a threshold magnitude. Solids tend to retain their shape, making the study of their rest and motion easier. Beyond...
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Characteristics of Fluids01:31

Characteristics of Fluids

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Fluids differ from solids primarily in their molecular structure and stress response. Solids have tightly packed molecules with strong intermolecular forces, maintaining their shape and resisting deformation. In contrast, fluids have molecules spaced farther apart with weaker forces, allowing them to flow and deform easily.
Fluids, which include both liquids and gases, are substances that deform continuously under shearing stress. For example, water and oil are liquids with molecules that can...
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Colloids03:22

Colloids

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Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
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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: Dec 9, 2025

Fabricating High-viscosity Droplets using Microfluidic Capillary Device with Phase-inversion Co-flow Structure
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Fabricating High-viscosity Droplets using Microfluidic Capillary Device with Phase-inversion Co-flow Structure

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Chain Formation and Phase Separation in Ferrofluids: The Influence on Viscous Properties.

Alexey O Ivanov1,2, Andrey Zubarev1,2

  • 1Department of Theoretical and Mathematical Physics, Ural Federal University, Lenin Ave. 51, 620000 Ekaterinburg, Russia.

Materials (Basel, Switzerland)
|September 10, 2020
PubMed
Summary
This summary is machine-generated.

Ferrofluids exhibit unique properties due to internal particle structures formed by magnetic fields. Understanding these transformations is key to harnessing ferrofluids for industrial and biomedical uses.

Keywords:
chain aggregatesferrofluidphase separationrheological properties

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Area of Science:

  • Materials Science
  • Physics
  • Fluid Mechanics

Background:

  • Ferrofluids possess unique physical properties attractive for industrial and biomedical applications.
  • Particle interactions and internal structural transformations under magnetic fields govern ferrofluid behavior.
  • Applied magnetic fields induce particle formations like chains and columns, altering fluid properties.

Purpose of the Study:

  • To provide an overview of experimental and theoretical studies on internal transformations in ferrofluids.
  • To elucidate the impact of these internal structures on the rheological properties of ferrofluids.

Main Methods:

  • Review of experimental investigations into ferrofluid structural changes.
  • Analysis of theoretical models describing particle interactions and self-assembly.
  • Examination of studies correlating structure formation with rheological effects.

Main Results:

  • Magnetic fields induce anisotropic structures (chains, columns) in ferrofluids.
  • These structures significantly modify rheological properties, such as viscosity and viscoelasticity.
  • A clear understanding of structure-property relationships is crucial for ferrofluid applications.

Conclusions:

  • Internal structural transformations are fundamental to ferrofluid behavior.
  • The study of these transformations is essential for optimizing ferrofluid performance in various applications.
  • Further research into structure-property relationships will unlock new ferrofluid technologies.