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Related Concept Videos

Cohesion01:07

Cohesion

57.9K
Cohesion is the attraction between molecules of the same type, such as water molecules. Water molecules have an overall neutral charge but are polar molecule. An oxygen atom in one water molecule has a partial negative charge that can bind to a hydrogen atom with a partial positive charge in a second water molecule, forming a hydrogen bond. Each water molecule can form up to four hydrogen bonds with other water molecules. Hydrogen bonds are responsible for water's cohesive nature.
On a...
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Network Covalent Solids02:18

Network Covalent Solids

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Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
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Connective Tissue Fibers and Ground Substance01:17

Connective Tissue Fibers and Ground Substance

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One of the significant functions of connective tissue is connecting tissues and organs. Unlike epithelial tissue that is composed of cells closely packed with little or no extracellular space in between, connective tissue cells are dispersed in a matrix. The matrix usually includes a large amount of extracellular material produced by the connective tissue cells that are embedded within it. It plays a significant role in the functioning of this tissue. The major component of the matrix is a...
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Coagulation01:06

Coagulation

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Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
1.1K
Precipitate Formation and Particle Size Control01:16

Precipitate Formation and Particle Size Control

4.9K
In precipitation gravimetry, the precipitating agent should react specifically or selectively with the analyte. While a specific reagent reacts with the analyte alone, a selective reagent can react with a limited number of chemical species.
The obtained precipitate should be either a pure substance of known composition or easily converted to one by a simple process, such as ignition or drying. In addition, the precipitate should be insoluble and easily filterable. In general, filterability...
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Adhesion01:14

Adhesion

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Adhesion occurs when one type of molecule is attracted to a different molecule. Water exhibits adhesive properties in the presence of polar surfaces, such as glass or cellulose in plants. For instance, when water is poured into a glass, the positively charged hydrogen molecules of water are more attracted to the negatively charged oxygen molecules in the silica than to the oxygen in neighboring water molecules.
Capillary action is a result of water’s adhesive tendencies. When a narrow...
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Gelatin Methacryloyl Granular Hydrogel Scaffolds: High-throughput Microgel Fabrication, Lyophilization, Chemical Assembly, and 3D Bioprinting
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Cohesion-controlled granular material.

Adrien Gans1, Olivier Pouliquen1, Maxime Nicolas1

  • 1Aix Marseille Univ, CNRS, IUSTI, Marseille, France.

Physical Review. E
|April 16, 2020
PubMed
Summary
This summary is machine-generated.

Researchers developed a stable, cohesion-controlled granular material using polymer-coated glass beads. This new material allows for controlled studies of cohesive granular flow dynamics.

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Area of Science:

  • Materials Science
  • Physics of granular materials

Background:

  • Understanding granular material flow is crucial in various industries.
  • Controlling interparticle forces is key to studying granular dynamics.

Purpose of the Study:

  • To develop a model granular material with tunable cohesion.
  • To investigate the relationship between material properties and interparticle forces.

Main Methods:

  • Coating spherical glass beads with a polyborosiloxane polymer.
  • Measuring interparticle forces, packing fraction, repose angle, and macroscopic cohesion.

Main Results:

  • The prepared granular material exhibits stable, time- and environment-insensitive cohesion.
  • Interparticle forces correlate with grain size and polymer coating thickness.

Conclusions:

  • The developed model material provides a controlled system for studying cohesive granular flow.
  • This offers new avenues for research in granular physics and material science.