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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...
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Crystal Growth: Principles of Crystallization01:25

Crystal Growth: Principles of Crystallization

5.1K
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...
5.1K
DNA as a Genetic Template02:05

DNA as a Genetic Template

27.9K
Two structural features of the DNA molecule provide a basis for the mechanisms of heredity: the four nucleotide bases and its double-stranded nature. The Watson-Crick model of double-helical DNA structure, proposed in 1952, drew heavily upon the X-ray crystallography work of researchers Rosalind Franklin and Maurice Wilkins. Watson, Crick, and Wilkins jointly received the Nobel Prize in Physiology or Medicine for their work in 1962. Franklin was, controversially, excluded from the prize for...
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DNA as a Genetic Template02:05

DNA as a Genetic Template

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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
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

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Writing Bragg Gratings in Multicore Fibers
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Templating Colloidal Crystal Growth Using Chirped Surface Relief Gratings.

Russell Mahmood1, Andrew Mettry1, Andrew C Hillier1

  • 1Department of Chemical and Biological Engineering , Iowa State University , Ames , Iowa 50011 , United States.

Langmuir : the ACS Journal of Surfaces and Colloids
|June 29, 2018
PubMed
Summary
This summary is machine-generated.

Researchers developed a method using chirped gratings to control colloidal crystal structures. This technique enables the formation of diverse lattice geometries for tunable optical properties.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Surface Chemistry

Background:

  • Colloidal crystals self-assemble into ordered structures.
  • Controlling lattice geometry is crucial for advanced material properties.
  • Traditional methods often yield limited structural diversity on planar surfaces.

Purpose of the Study:

  • To report a novel method for controlling colloidal crystal lattice geometry.
  • To investigate the formation of diverse lattice structures using confined convective self-assembly.
  • To explore the relationship between surface nanostructure and resulting optical properties.

Main Methods:

  • Fabrication of chirped surface relief gratings using laser interference lithography.
  • Confined convective self-assembly of monodisperse colloidal particles on patterned substrates.
  • Analysis of particle-surface and particle-particle interactions guiding lattice formation.

Main Results:

  • Demonstrated control over colloidal crystal lattice geometries, including square, hexagonal, and rhombic structures.
  • Observed formation of linear chains, particle pairs/triplets, and graphitelike structures.
  • Showcased tunable optical reflection features based on varying lattice configurations.

Conclusions:

  • Chirped gratings effectively guide the self-assembly of colloidal crystals into non-conventional lattices.
  • The method allows for precise control over crystal structure and subsequent optical properties.
  • This approach offers a pathway to large-area fabrication of functional nanomaterials.