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Kinematic Equations for Rotation01:30

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In mechanics, when one observes a rigid body in rotational motion with constant angular acceleration, it is possible to establish equations for its rotational kinematics. This process resembles how linear kinematics are dealt with in simpler motion studies.
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A charged particle experiences a force when moving through a magnetic field. Consider the field to be uniform and the charged particle to move perpendicular to it. If the field is in a vacuum, the magnetic field is the dominant factor determining the motion. Since the magnetic force is perpendicular to the direction of motion, a charged particle follows a curved path. The particle continues to follow this curved path until it forms a complete circle. Another way to look at this is that the...
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Particle Rotation in Colloidal Processing under a Strong Rotating Magnetic Field.

Shoko Baba1, Satoshi Tanaka1

  • 1Department of Materials Science and Technology , Nagaoka University of Technology , 1603-1 Kamitomioka , Nagaoka , Niigata 9402188 , Japan.

Langmuir : the ACS Journal of Surfaces and Colloids
|May 4, 2018
PubMed
Summary

Orienting functional ceramic particles in a magnetic field enhances their properties. This study shows particle orientation in a slurry under a rotating magnetic field is achievable and depends on viscosity and magnetic field strength.

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Area of Science:

  • Materials Science
  • Ceramics Engineering
  • Crystallography

Background:

  • Functional ceramics with oriented crystals exhibit enhanced properties.
  • Colloidal processing in magnetic fields is a method for achieving crystal orientation.

Purpose of the Study:

  • To experimentally demonstrate and quantify particle orientation in a concentrated slurry under a strong rotating magnetic field.
  • To investigate the relationship between processing parameters and the degree of particle orientation.

Main Methods:

  • A slurry of (Sr,Ca)2NaNb5O15 particles in UV-curable resin was subjected to a rotating magnetic field.
  • Fast photopolymerization using UV irradiation was employed to consolidate the oriented slurry.
  • Particle orientation was monitored over time under varying magnetic field strengths and slurry viscosities.

Main Results:

  • The degree of particle orientation increased with processing time, reaching saturation after 20 seconds.
  • Orientation time was found to be proportional to slurry viscosity.
  • Orientation time was inversely proportional to the square of the magnetic flux density.

Conclusions:

  • Fast photopolymerization under a rotating magnetic field is an effective method for orienting functional ceramic particles.
  • The observed relationships provide a basis for optimizing processing parameters for enhanced ceramic functionality.