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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

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 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 - 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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Mnemonic Devices01:23

Mnemonic Devices

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Mnemonic devices are cognitive tools that facilitate memory retention by linking new information to familiar patterns or organizational strategies. These techniques are beneficial for remembering complex or lengthy sets of information by simplifying and structuring them in easily retrievable ways.
Acronyms
Acronyms are created by using the initial letters of a series of words to form a new word or phrase. This approach condenses complex information into a single, memorable entity. For example,...
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Non-ohmic Devices00:51

Non-ohmic Devices

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In most substances, the current flow is proportional to the voltage applied to it. A simple relationship between the values of current, voltage, and resistance is known as Ohm's law. Nonohmic devices do not exhibit a linear relationship between voltage and current. One such device is the semiconducting circuit element known as a diode. A diode is a circuit device that allows current flow in only one direction.
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Synthesis of Biocompatible Liquid Crystal Elastomer Foams as Cell Scaffolds for 3D Spatial Cell Cultures
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Evaluation of Versatile CdS Nanomaterials Based Liquid Crystals Switchable Device.

Kaushik Pal, Sabu Thomas, M L N Madhu Mohan

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    Summary

    This study introduces novel cadmium sulfide (CdS) nanostructures integrated with liquid crystals for advanced applications. These composites exhibit electrically tunable optical properties, paving the way for switchable electro-optic devices.

    Keywords:
    CdS NanostructuresLiquid CrystalsPhase TransitionSwitchable Device

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    Area of Science:

    • Materials Science
    • Nanotechnology
    • Physical Chemistry

    Background:

    • Cadmium sulfide (CdS) nanostructures offer unique optical and electronic properties.
    • Liquid crystals (LCs) exhibit ordered phases sensitive to external stimuli.
    • Integrating nanomaterials with LCs can lead to novel composite materials with enhanced functionalities.

    Purpose of the Study:

    • To synthesize novel CdS nanostructures (nano-brush, nano-cube, nanosphere) and explore their properties when dispersed in liquid crystals.
    • To investigate the structure-property relationships between CdS nanostructures and ferroelectric hydrogen-bonded liquid-crystalline complexes (HBLC).
    • To explore the potential of these composites in chemical-friendly media and for electro-optic applications.

    Main Methods:

    • Hydrothermal synthesis of CdS nano-wire brushes with stacking fault structures.
    • Formation of hydrogen bonds between CdS nanostructures and supramolecular liquid crystals (LCs) using p–n-alkyloxy benzoic acids (n-OBA).
    • Characterization using Fourier-transform infrared (FTIR) spectroscopy and Gaussian simulation.
    • Phase diagram construction and analysis of temperature-dependent dielectric relaxation, tilt angle, and electro-optical switching measurements.

    Main Results:

    • Successful one-step hydrothermal synthesis of CdS nano-wire brushes.
    • Confirmation of intermolecular hydrogen bond formation between CdS nanostructures and LCs via FTIR and Gaussian simulation.
    • Observation of a new, sensitive response of smectic G ordering in CdS nanostructure-influenced LC mixtures.
    • Demonstration of electrically tunable polarization of emission from CdS nanostructures, controlled by an external bias.

    Conclusions:

    • The study presents a novel method for synthesizing CdS nanostructures and their integration with liquid crystals.
    • The developed composites exhibit electrically tunable optical properties, enabling control over emission polarization.
    • These findings suggest potential for engineering practical electro-optic switchable devices based on CdS-LC composites.