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Related Concept Videos

Colloids03:22

Colloids

21.2K
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...
21.2K
Ionic Crystal Structures02:42

Ionic Crystal Structures

17.1K
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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Colloids and Suspensions01:17

Colloids and Suspensions

3.5K
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...
3.5K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

30.9K
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...
30.9K
Colloidal precipitates01:09

Colloidal precipitates

6.5K
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...
6.5K
Inverse Trigonometric Functions01:29

Inverse Trigonometric Functions

283
Inverse trigonometric functions are fundamental mathematical tools that reverse the actions of standard trigonometric functions. While trigonometric functions map angles to ratios, inverse trigonometric functions perform the opposite operation by mapping a ratio back to its corresponding angle. These functions are essential in various applications, particularly in determining angles when given specific distances, such as calculating elevation angles in navigation and engineering.For a function...
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Quantitative and Qualitative Examination of Particle-particle Interactions Using Colloidal Probe Nanoscopy
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Inverse Design of Colloidal Crystals via Optimized Patchy Interactions.

D Chen, G Zhang, S Torquato

    The Journal of Physical Chemistry. B
    |August 9, 2018
    PubMed
    Summary
    This summary is machine-generated.

    Researchers used inverse statistical mechanics to design patchy colloidal particles for creating defect-free 2D crystals like square and honeycomb structures. These crystals exhibit useful photonic, phononic, and magnetic properties for various applications.

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    Area of Science:

    • Colloidal science
    • Statistical mechanics
    • Materials science

    Background:

    • Inverse statistical mechanics optimizes interactions for target configurations.
    • Designing anisotropic interactions for specific crystal structures is challenging.

    Purpose of the Study:

    • Generalize inverse techniques to design experimentally realizable patchy colloidal particles.
    • Achieve defect-free low-coordinated 2D crystal structures (square, honeycomb, kagomé, parallelogrammic).
    • Target crystals with desirable photonic, phononic, and magnetic properties.

    Main Methods:

    • Applied generalized inverse statistical mechanics.
    • Optimized anisotropic interactions for spherical colloidal particles.
    • Focused on designing specific 2D crystal lattices.

    Main Results:

    • Successfully designed patchy colloids for targeted 2D crystal structures.
    • Demonstrated robust achievement of square, honeycomb, kagomé, and parallelogrammic crystals.
    • Showed defect-free structures at low temperatures with few defects.

    Conclusions:

    • Developed a method to synthesize specific 2D crystals using patchy colloids.
    • Provided optimal parameters for experimentalists.
    • Enabled creation of crystals with valuable physical properties for applications.