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Related Concept Videos

Colloids03:22

Colloids

21.3K
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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Spherical Coordinates01:23

Spherical Coordinates

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Spherical coordinate systems are preferred over Cartesian, polar, or cylindrical coordinates for systems with spherical symmetry. For example, to describe the surface of a sphere, Cartesian coordinates require all three coordinates. On the other hand, the spherical coordinate system requires only one parameter: the sphere's radius. As a result, the complicated mathematical calculations become simple. Spherical coordinates are used in science and engineering applications like electric and...
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Binary Fission01:26

Binary Fission

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Binary fission is the primary mode of asexual reproduction in prokaryotes, such as bacteria. It results in the production of two genetically identical daughter cells. This highly efficient process ensures the rapid propagation of bacterial populations under favorable conditions and involves coordinated cellular and molecular events.DNA Replication and SeparationThe process begins with the replication of the bacterial chromosome. The circular DNA molecule unwinds at a specific origin of...
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Binary Fission01:20

Binary Fission

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Fission is the division of a single entity into two or more parts, which regenerate into separate entities that resemble the original. Organisms in the Archaea and Bacteria domains reproduce using binary fission, in which a parent cell splits into two parts that can each grow to the size of the original parent cell. This asexual method of reproduction produces cells that are all genetically identical.
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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...
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Tangential Flow Ultrafiltration: A &ldquo;Green&rdquo; Method for the Size Selection and Concentration of Colloidal Silver Nanoparticles
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Ordered Surface Structuring of Spherical Colloids with Binary Nanoparticle Superlattices.

Fabian Meder1, Steffi S Thomas1, Tobias Bollhorst2

  • 1Centre for BioNano Interactions , University College Dublin, School of Chemistry and Chemical Biology , Belfield, Dublin 4, Ireland.

Nano Letters
|March 27, 2018
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Summary
This summary is machine-generated.

Researchers developed a novel bottom-up assembly method to create precise nanoscale surface patterns on colloidal particles. This technique enables the formation of complex binary superlattices for advanced metamaterials in bionanoscience, photonics, and electronics.

Keywords:
Self-assemblycolloidal crystalsnanostructuringsurface functionalization

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Area of Science:

  • Colloidal science
  • Materials science
  • Nanotechnology

Background:

  • Surface patterning of colloidal matter below 10 nm offers significant functionality for various applications.
  • Existing patterning techniques are often limited to planar substrates and struggle with colloidal systems.
  • Controlling non-equilibrium conditions during nanoparticle self-assembly for precise patterning in solution is challenging.

Purpose of the Study:

  • To develop a method for creating precise surface patterns on colloidal particles in solution.
  • To demonstrate the assembly of binary nanoparticle superlattices on amorphous colloidal cores.
  • To enable the fabrication of multicomponent metamaterials with controlled nanoscale features.

Main Methods:

  • Bottom-up assembly of binary nanoparticle superlattices on amorphous colloidal core particles.
  • Utilizing monodispersed gold (Au) and palladium (Pd) nanoparticles with silica (SiO2) core particles.
  • Preserving the colloidal environment throughout the crystallization process.

Main Results:

  • Formation of surface patterns with periodic repeats of 8.9 ± 0.9 nm on colloidal core particles.
  • Successful assembly of AB13-like, binary, and isotropic superlattice domains.
  • Demonstrated control over self-assembly of variable building blocks (Au, Pd, SiO2 NPs).

Conclusions:

  • A novel 3D, bottom-up assembly technique for patterning colloidal matter in the sub-10 nm regime has been established.
  • This method provides access to multicomponent metamaterials for bionanoscience, photonics, and electronics.
  • The technique overcomes limitations of previous methods by enabling patterning in a colloidal environment.