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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 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.
Initiating crystallization involves manipulating the concentration of the solute and the temperature of the solution. Since crystal growth occurs when the ratio of concentration and solubility of the solute in the solvent...
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Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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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 Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

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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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Dynamic Equilibrium02:20

Dynamic Equilibrium

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A reversible chemical reaction represents a chemical process that proceeds in both forward (left to right) and reverse (right to left) directions. When the rates of the forward and reverse reactions are equal, the concentrations of the reactant and product species remain constant over time and the system is at equilibrium. A special double arrow is used to emphasize the reversible nature of the reaction. The relative concentrations of reactants and products in equilibrium systems vary greatly;...
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Molecular Comparison of Gases, Liquids, and Solids02:26

Molecular Comparison of Gases, Liquids, and Solids

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Particles in a solid are tightly packed together (fixed shape) and often arranged in a regular pattern; in a liquid, they are close together with no regular arrangement (no fixed shape); in a gas, they are far apart with no regular arrangement (no fixed shape). Particles in a solid vibrate about fixed positions (cannot flow) and do not generally move in relation to one another; in a liquid, they move past each other (can flow) but remain in essentially constant contact; in a gas, they move...
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Synthesis of Biocompatible Liquid Crystal Elastomer Foams as Cell Scaffolds for 3D Spatial Cell Cultures
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Liquid Crystal Enabled Dynamic Nanodevices.

Zhenhe Ma1, Xianghe Meng2, Xiaodi Liu3

  • 1College of Information Science and Engineering, Northeastern University, Shenyang 110004, China. mazhenhe@163.com.

Nanomaterials (Basel, Switzerland)
|October 27, 2018
PubMed
Summary
This summary is machine-generated.

Hybrid nanodevices combining liquid crystals (LCs) and plasmonic metasurfaces enable dynamic optical components. These LC-plasmonic systems offer tunable optical properties for advanced applications like ultra-fast switching and sensing.

Keywords:
actively tunable nanodevicesliquid crystalsmetasurfacesplasmonics

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Area of Science:

  • Nanotechnology
  • Materials Science
  • Optoelectronics

Background:

  • Liquid crystals (LCs) exhibit anisotropic molecular shapes and tunable alignment.
  • Plasmonic metasurfaces offer nanoscale light manipulation capabilities.
  • Hybrid systems integrating LCs and metasurfaces are gaining attention for novel optical devices.

Purpose of the Study:

  • To review elegant designs of metasurface-based nanodevices integrated with LCs.
  • To explore tuning factors affecting transmittance, extinction, and scattering spectra.
  • To classify tunable devices based on LC-plasmonic interactions.

Main Methods:

  • Integration of liquid crystals with plasmonic metasurfaces.
  • Exploration of electro-optical properties for dynamic modulation.
  • Analysis of nanostructure geometries and environmental parameters for performance optimization.

Main Results:

  • Demonstration of dynamically tunable optoelectronic nanodevices.
  • Manipulation of electromagnetic waves at the nanoscale.
  • Improved device performance through precise control of LC alignment and optimized parameters.

Conclusions:

  • LC-plasmonic hybrid nanodevices enable advanced optical functionalities.
  • These devices are crucial for applications including ultra-fast switching, modulation, sensing, imaging, and waveguiding.
  • Precise control over LC alignment within nanostructures significantly enhances device performance.