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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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Colloids03:22

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Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
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Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
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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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Colloids and Suspensions01:17

Colloids and Suspensions

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Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles visible to the naked eye or seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. The suspended particles in a suspension settle out after some time of mixing. The separation of particles from a suspension is...
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Colloidal precipitates01:09

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The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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Fabrication of 1-D Photonic Crystal Cavity on a Nanofiber Using Femtosecond Laser-induced Ablation
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Clickable Colloidal Photonic Crystals for Structural Color Pattern.

Jialun Chen, Panmiao Liu, Xin Du

    Langmuir : the ACS Journal of Surfaces and Colloids
    |October 25, 2018
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    Summary
    This summary is machine-generated.

    Researchers developed clickable colloidal photonic crystals for advanced optical devices. This method allows simple grafting of chemical groups to create tunable structure color patterns for various applications.

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    Area of Science:

    • Materials Science
    • Nanotechnology
    • Optics

    Background:

    • Colloidal photonic crystals are crucial for optical devices, coatings, displays, and sensors.
    • Existing methods for patterning these crystals can be complex and time-consuming.

    Purpose of the Study:

    • To propose a novel method for patterning colloidal photonic crystals using clickable silica particles.
    • To demonstrate the creation of tunable structure color patterns via surface modification.

    Main Methods:

    • Synthesis of vinyl-modified sub-micrometer silica particles as building blocks.
    • Fabrication of clickable colloidal photonic crystal films.
    • Grafting of different chemical groups onto the films using click chemistry.

    Main Results:

    • Successfully patterned colloidal photonic crystal films with tunable wettability.
    • Demonstrated the formation of distinct structure color patterns based on surface chemistry.
    • Achieved a simple, controllable, and rapid patterning process.

    Conclusions:

    • Clickable colloidal photonic crystals offer a versatile platform for creating advanced optical materials.
    • The click chemistry approach enables facile surface functionalization for tailored properties.
    • This method provides a significant advancement in the fabrication of patterned photonic structures.