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Related Concept Videos

Magnetic Damping01:17

Magnetic Damping

Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
Types of Fluids01:27

Types of Fluids

Fluids can be classified into Newtonian and non-Newtonian fluids based on their response to shear stress. Newtonian fluids have a linear relationship between shear stress and the shear strain rate, following Newton's law of viscosity. Their viscosity remains constant regardless of the shear rate, making their behavior predictable and easier to analyze. Common examples include water, air, oil, and gasoline.
In contrast, non-Newtonian fluids do not follow Newton's law of viscosity, and their...
Magnetic Susceptibility and Permeability01:31

Magnetic Susceptibility and Permeability

In linear magnetic materials, like paramagnets and diamagnets, magnetization is proportional to the magnetic field intensity. The constant of proportionality, a dimensionless number, is called magnetic susceptibility. The value of the susceptibility depends on the type of material.
When diamagnetic materials are placed under an external magnetic field, the moments opposite to the field are induced. Hence, the susceptibility for diamagnets has a minimal negative value of 10-5–10-6. Since...
Ferromagnetism01:31

Ferromagnetism

Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
Characteristics of Fluids01:20

Characteristics of Fluids

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...
Characteristics of Fluids01:31

Characteristics of Fluids

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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Aqueous Droplets Used as Enzymatic Microreactors and Their Electromagnetic Actuation
08:27

Aqueous Droplets Used as Enzymatic Microreactors and Their Electromagnetic Actuation

Published on: August 28, 2017

Magnetically responsive dry fluids.

Filipa L Sousa1, Rodney Bustamante, Angel Millán

  • 1Departamento de Química and CICECO, Aveiro Institute of Nanotechnology, Universidade de Aveiro, 3810-193 Aveiro, Portugal. filipalsousa@ua.pt

Nanoscale
|July 9, 2013
PubMed
Summary
This summary is machine-generated.

Researchers created "dry ferrofluids" by encapsulating magnetic ferrofluids in silica. This novel material acts like a powder but allows nanoparticles to move freely, maintaining stable properties for practical applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Colloid Science

Background:

  • Ferrofluids and dry magnetic particles are distinct magnetic materials with niche applications.
  • Their distinct viscosity and interparticle distances limit practical applications due to stability issues.
  • Maintaining stable properties like viscosity and interparticle distance is crucial for advanced applications.

Purpose of the Study:

  • To develop a novel magnetic material that combines the properties of ferrofluids and dry powders.
  • To overcome the limitations of traditional magnetic materials by ensuring stable interparticle distances and nanoparticle mobility.
  • To create a material that behaves macroscopically as a dry powder but functions as a ferrofluid at the nanoscale.

Main Methods:

  • Encapsulation of magnetic ferrofluids within highly hydrophobic silica shells.
  • Development of a process to create a material exhibiting dry powder characteristics.
  • Characterization of the resulting material's macroscopic and microscopic magnetic properties.

Main Results:

  • Successful formation of "dry ferrofluids" through silica encapsulation.
  • The resulting material exhibits macroscopic dry powder behavior.
  • Microscopically, the encapsulated magnetic nanoparticles remain free to rotate within the liquid phase, mimicking ferrofluid behavior.
  • Achieved stable interparticle distances, independent of external viscosity.

Conclusions:

  • The developed "dry ferrofluids" represent a new class of magnetic materials.
  • This innovation addresses the challenge of maintaining stable properties in magnetic materials.
  • The unique properties offer potential for advanced applications requiring stable magnetic responses in a powder form.