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Colloids and Suspensions01:17

Colloids and Suspensions

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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...
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Bone contains a relatively small number of cells entrenched in a matrix of collagen fibers that provide an adherent surface for inorganic salt crystals. Both components of the matrix, organic and inorganic, contribute to the unusual properties of bone. Without collagen, bones would be brittle and shatter easily. Without mineral crystals, bones would flex and provide little support. This can be observed by an experiment: when the minerals of a bone are dissolved by soaking the bone in...
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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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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.
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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.
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A perfect crystal, in theory, has a uniform structure with the same unit cell and lattice points throughout. However, any deviation from this periodic arrangement is known as an imperfection or defect. These defects can be categorized into three types: point, line, and plane defects.Point defects occur when there is a deviation from the ideal due to missing atoms, displaced atoms, or additional atoms. These imperfections might occur due to imperfect packing during crystallization or because of...
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結晶化可能なポリマーの混合物からの均一な不均一で空洞な長方形の血小板ミセル

Huibin Qiu1, Yang Gao1, Charlotte E Boott1

  • 1School of Chemistry, University of Bristol, Bristol BS8 1TS, UK.

Science (New York, N.Y.)
|May 7, 2016
PubMed
まとめ

研究者は,種を蒔いた成長方法を用いて,均一で二次元 (2D) の長方形の血小板ミセルを作成しました. これらの自己組み立て材料は 精密に加工され 固体や空洞の構造を作り 様々な用途に用いられます

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科学分野:

  • 材料科学
  • ナノテクノロジー
  • ポリマー化学

背景:

  • 制御可能な構造 (固体または空洞) を有する安定した自己組み立ての2D材料を作成することは,材料科学における重要な課題です.
  • ナノマテリアルの形状と特性を調整することは 先進的な応用に不可欠です

研究 の 目的:

  • 均一で単一分散の長方形の血小板ミセルを制御する方法を開発する.
  • 固体と空洞の2Dナノ構造の両方を 作り出す能力を実証するためです
  • これらのナノオブジェクトのさらなる機能化のための調整可能なプラットフォームを確立します.

主な方法:

  • 結晶コイルブロックコポリマーとホモポリマーを含むシード成長技術を使用した.
  • 異なるポリマーの混合物をシリンダ状のミケルの種に連続的に加える.
  • 空洞構造の解体と形成のための空間的に選択的な処理を適用します.

主要な成果:

  • 制御された大きさの均一で単一分散の長方形の血小板ミセルが形成されました.
  • 固い血小板ブロックのコミセルを作り出し,同心四角形のパッチと明確な冠状の化学反応が得られました.
  • これらの構造が 明確に定義された空洞の長方形のリングと 穿孔した血小板に 分解することを示した.

結論:

  • 開発されたシード成長方法は,調節可能な2Dナノ構造を製造するための堅固なアプローチを提供します.
  • その結果,固体と空洞の長方形のミセルは,さらなる改変と多様なアプリケーションのための多用途のプラットフォームを提供します.
  • この研究は複雑な自己組み立てナノマテリアルの設計と合成を進めている.