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Related Concept Videos

Ionic Crystal Structures02:42

Ionic Crystal Structures

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Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
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Crystal Field Theory - Octahedral Complexes02:58

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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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Crystal Growth: Principles of Crystallization01:25

Crystal Growth: Principles of Crystallization

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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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Classification of Skeletal Muscle Fibers01:48

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Skeletal muscles continuously produce ATP to provide the energy that enables muscle contractions. Skeletal muscle fibers can be categorized into three types based on differences in their contraction speed and how they produce ATP, as well as physical differences related to these factors. Most human muscles contain all three muscle fiber types, albeit in varying proportions.
Slow-Twitch Muscle Fibers
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James Marcia's identity status model provides a framework for understanding how adolescents navigate identity formation through varying degrees of exploration and commitment. Marcia's model builds on Erik Erikson's theories of psychosocial development, focusing specifically on how adolescents reconcile individual aspirations with societal expectations. His model describes identity formation as a dynamic process where adolescents move between different states depending on their level...
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Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

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Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
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Preparation of Large-area Vertical 2D Crystal Hetero-structures Through the Sulfurization of Transition Metal Films for Device Fabrication
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2D Crystal-Based Fibers: Status and Challenges.

Si Meng1,2, Tiantian Kong3, Wujun Ma4

  • 1College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, China.

Small (Weinheim an Der Bergstrasse, Germany)
|August 15, 2019
PubMed
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This review details the fabrication and applications of two-dimensional (2D) crystal-based fibers. These advanced materials offer unique properties for flexible electronics and smart wearable devices.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Two-dimensional (2D) crystals are versatile nanomaterials with applications across diverse fields.
  • Processing 2D crystals into macroscale forms like fibers is crucial for practical implementation.
  • 2D crystal-based fibers leverage unique structural and property advantages.

Purpose of the Study:

  • To provide a comprehensive overview of 2D crystal-based fibers.
  • To systematically introduce fabrication methods for 2D crystals, dispersions, and fibers.
  • To discuss current and potential applications of these advanced fibers.

Main Methods:

  • Overview of 2D crystals based on elemental composition.
  • Systematic introduction of methods for preparing 2D crystals and their dispersions.
  • Detailed discussion on fabricating 2D crystal-based fibers.

Main Results:

  • Successful preparation of various 2D crystals is reviewed.
  • Methods for creating 2D crystal dispersions and fibers are systematically presented.
  • Applications in flexible electronics, catalysis, and adsorption are highlighted.

Conclusions:

  • 2D crystal-based fibers are vital for expanding the impact of 2D materials.
  • This review offers guidelines for developing new 2D crystal fibers.
  • Future potential lies in smart wearable devices and advanced functional materials.