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Related Concept Videos

Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
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Phase Transitions: Melting and Freezing

Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
Crystal Growth: Principles of Crystallization01:25

Crystal Growth: Principles of Crystallization

Crystallization is a phase transformation process in which crystals are precipitated from a supersaturated solution or formed from other sources. During crystallization, atoms or molecules arrange themselves into a well-defined, rigid crystal lattice to minimize energy.
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Electric Field of a Non Uniformly Charged Sphere01:22

Electric Field of a Non Uniformly Charged Sphere

Gauss's law states that the electric flux through any closed surface equals the net charge enclosed within the surface. This law is beneficial for determining the expressions for the electric field for a particular charge distribution if the electric flux is known.
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Electrostatic Boundary Conditions in Dielectrics01:27

Electrostatic Boundary Conditions in Dielectrics

When an electric field passes from one homogeneous medium to another, crossing the boundary between the two mediums imparts a discontinuity in the electric field. This results in electrostatic boundary conditions that depend on the type of mediums the field propagates through.
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The simplest case of a surface charge distribution is the uniformly charged disk. Calculating its electric field also helps us calculate the electric field of a large plane of charge.
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A Microfluidic Approach for the Study of Ice and Clathrate Hydrate Crystallization
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Published on: August 18, 2022

Characterizing ice crystal growth behavior under electric field using phase field method.

Zhi Zhu He1, Jing Liu

  • 1Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, P.O. Box 2711, Beijing 100190, China.

Journal of Biomechanical Engineering
|July 31, 2009
PubMed
Summary
This summary is machine-generated.

Investigating microscale ice crystal growth under electric fields reveals competitive nucleus development. This research offers a new theoretical tool for understanding freeze injury in cryosurgery and cryopreservation.

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Area of Science:

  • Physics
  • Materials Science
  • Biophysics

Background:

  • Ice crystal formation is crucial in cryopreservation and cryosurgery.
  • Understanding microscale ice growth dynamics is essential for optimizing these processes.
  • The influence of external electric fields on ice nucleation and growth is not fully understood.

Purpose of the Study:

  • To investigate the microscale ice crystal growth behavior under an electrostatic field.
  • To incorporate anisotropy and thermal noise effects into the investigation.
  • To provide a theoretical framework for understanding freeze injury mechanisms.

Main Methods:

  • A phase field method was employed to simulate ice crystal growth.
  • The model incorporated anisotropic surface energy and thermal noise.
  • Simulations were used to predict the competitive growth of multiple ice nuclei.

Main Results:

  • The phase field model successfully predicted the competitive growth of multiple ice nuclei.
  • The study demonstrated the influence of electrostatic fields on ice crystal morphology and growth patterns.
  • Anisotropy and thermal noise were shown to play significant roles in the growth dynamics.

Conclusions:

  • The developed phase field method is an efficient theoretical tool for studying ice crystal growth under electric fields.
  • This approach can enhance the understanding of freeze injury mechanisms in biological tissues during cryosurgery and cryopreservation.
  • Further research can explore the application of electric fields to control ice formation in biological applications.