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Related Concept Videos

Structure and Function of Platelets01:18

Structure and Function of Platelets

The cell fragments known as platelets are disc-shaped, with an average diameter of about 3 μm and a thickness of roughly 1 μm. They play a crucial role in the body's vascular clotting system, which also involves plasma proteins, blood cells, and blood vessel tissues.
Platelets are continually replenished, circulating in the bloodstream for 9-12 days before being removed by phagocytes, primarily in the spleen. A microliter of circulating blood contains between 150,000 and 450,000 platelets, with...
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The platelet phase, the second stage of hemostasis, commences around 15-20 seconds after an injury. It follows and overlaps with the vascular phase, during which blood vessels constrict to minimize blood loss.
As the injured blood vessel contracts, endothelial cells undergo contraction, revealing collagen fibers in the basement membrane and underlying connective tissue. Furthermore, the plasma membrane of endothelial cells becomes adhesive, preparing the site for platelet adhesion. Platelets...
Colloids and Suspensions01:17

Colloids and Suspensions

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...
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...
Coagulation01:06

Coagulation

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...
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Disorders of Hemostasis

Hemostasis, the process that stops bleeding after a blood vessel injury, is crucial for maintaining the integrity of the circulatory system. However, disorders of hemostasis can disrupt this delicate balance, leading to either excessive clotting or bleeding. These disorders can be broadly classified into thromboembolic disorders and bleeding disorders.
Thromboembolic Disorders
Two factors primarily cause thromboembolic conditions.

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Comprehensive Analysis of Procoagulant Platelets Exhibiting Features of Necrosis, Apoptosis and Platelet Activation
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Anomalous columnar order of charged colloidal platelets.

L Morales-Anda1, H H Wensink, A Galindo

  • 1Departamento de Ingeniería Física, División de Ciencias e Ingenierías Campus León, Universidad de Guanajuato, Colonia Lomas del Campestre, León 37150, México.

The Journal of Chemical Physics
|January 28, 2012
PubMed
Summary

Monte Carlo simulations reveal how electrostatic interactions influence synthetic clay structures. Anomalous hexagonal columnar phases and glassy disordered structures form under varying salt concentrations and pressures.

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Area of Science:

  • Colloid and surface science
  • Computational physics
  • Materials science

Background:

  • Understanding the self-assembly of charged colloidal systems is crucial for designing advanced materials.
  • Electrostatic interactions play a significant role in the phase behavior and structural organization of synthetic clays.

Purpose of the Study:

  • To investigate the impact of electrostatic interactions on the structure of like-charged colloidal platelets using computer simulations.
  • To elucidate the formation of anomalous columnar and glassy structures in synthetic clay systems.

Main Methods:

  • Isothermal-isobaric (NpT) ensemble Monte Carlo simulations.
  • Modeling short-range repulsion with a hard-core potential and electrostatic interactions with a screened Coulombic (Yukawa) potential.
  • Analysis of statistical functions like pair correlation and structure factor.

Main Results:

  • A shift in the isotropic-nematic transition compared to hard-sphere systems was observed.
  • Anomalous hexagonal columnar structures with interpenetrating columns formed at low salinity and high osmotic pressure.
  • Glassy, disordered "nematic columnar" structures emerged at higher ionic strengths, consistent with experimental observations of gibbsite platelets.

Conclusions:

  • Electrostatic forces significantly alter the phase diagram and structural organization of colloidal platelets.
  • The study reproduces experimentally observed "nematic columnar" phases, validating the simulation model.
  • Findings provide insights into the design and behavior of synthetic clay materials.