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Related Concept Videos

Metallic Solids02:37

Metallic Solids

Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and malleability. Many...
Colloidal precipitates01:09

Colloidal precipitates

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...
Lattice Centering and Coordination Number02:33

Lattice Centering and Coordination Number

The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
Types of Unit Cells
Imagine taking a large number of identical...
Structures of Solids02:22

Structures of Solids

Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
Unit Cells01:18

Unit Cells

A crystal's internal structure is an orderly array of atoms, ions, or molecules, and the details of this array significantly influence the solid's properties. In a crystal, periodically repeating 'structural motifs' - which could be atoms, molecules, or groups thereof - create a 'space lattice.' This is essentially a three-dimensional, infinite array of points, each surrounded by its neighbors in an identical way, forming the basic structure of the crystal.A 'unit cell' is a theoretical...
The Colloidal State01:29

The Colloidal State

The formation of a colloidal system is exemplified by an aqueous solution containing Cl− ions is introduced to another containing Ag+ ions, resulting in the precipitation of solid AgCl as extremely tiny crystals. Instead of settling out as a filterable precipitate, these crystals remain suspended in the liquid, showcasing a colloidal system.A colloidal system involves colloidal particles within the approximate range of 1 to 1000 nm in at least one dimension, dispersed in a medium called the...

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Patterning of Microorganisms and Microparticles through Sequential Capillarity-assisted Assembly
10:17

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Published on: November 4, 2021

Periodicity-controlled two-dimensional crystalline colloidal arrays.

Jian-Tao Zhang1, Luling Wang, Xing Chao

  • 1Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA.

Langmuir : the ACS Journal of Surfaces and Colloids
|October 20, 2011
PubMed
Summary
This summary is machine-generated.

Researchers created a fast method for making 2-D particle arrays on mercury. These arrays can be attached to hydrogels, allowing their spacing to be tuned by environmental factors.

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Area of Science:

  • Materials Science
  • Surface Chemistry
  • Nanotechnology

Background:

  • Two-dimensional (2-D) particle arrays are crucial for advanced materials.
  • Current methods for fabricating these arrays can be slow and complex.
  • Controlling the spacing of particles within these arrays is essential for tunable properties.

Purpose of the Study:

  • To develop a rapid and convenient method for fabricating large-area, close-packed 2-D particle arrays on mercury surfaces.
  • To integrate these 2-D particle arrays with functional hydrogel films.
  • To demonstrate the ability to tune the spacing of the particle arrays via hydrogel environmental responses.

Main Methods:

  • Utilized aqueous colloidal particle suspensions with added cosolvents (e.g., alcohols) to induce self-assembly on mercury.
  • Fabricated large-area (>70 cm(2)) close-packed 2-D arrays within 30 seconds.
  • Attached particle arrays to functional hydrogel films and monitored spacing changes using confocal laser scanning microscopy.

Main Results:

  • Successfully prepared large-area, close-packed 2-D particle arrays rapidly and conveniently.
  • Demonstrated successful integration of 2-D particle arrays with hydrogel films.
  • Observed direct correlation between hydrogel volume changes (due to pH, solvent, temperature) and alterations in 2-D array spacing.

Conclusions:

  • The developed method offers a fast and efficient route to fabricating tunable 2-D particle arrays.
  • The integration with hydrogels provides a platform for responsive nanomaterials.
  • This technique has potential applications in sensors, responsive surfaces, and advanced optical materials.