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関連する概念動画

Ionic Crystal Structures02:42

Ionic Crystal Structures

18.1K
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
18.1K
Carboxylic Acids to Acid Chlorides01:18

Carboxylic Acids to Acid Chlorides

6.9K
Carboxylic acids react with SOCl2 or PCl5 to form acid chlorides. Amongst the carboxylic acid derivatives, acid chlorides are the most reactive and synthetically important derivatives. They are useful reagents for Friedel–Crafts acylation of some aromatic compounds.
6.9K
Preparation of Carboxylic Acids: Carboxylation of Grignard Reagents01:13

Preparation of Carboxylic Acids: Carboxylation of Grignard Reagents

5.6K
Carboxylic acids can be prepared by the carboxylation of Grignard reagents (RMgX). This method is convenient for converting alkyl (primary, secondary or tertiary), vinyl, benzyl, and aryl halides to carboxylic acids with one additional carbon than the starting RMgX.
5.6K
[3,3] Sigmatropic Rearrangement of Allyl Vinyl Ethers: Claisen Rearrangement01:24

[3,3] Sigmatropic Rearrangement of Allyl Vinyl Ethers: Claisen Rearrangement

1.9K
The Claisen rearrangement is a [3,3] sigmatropic rearrangement of allyl vinyl ethers to unsaturated carbonyl compounds. The rearrangement is a concerted pericyclic reaction proceeding via a chair-like transition state.
1.9K
Antiarrhythmic Drugs: Class IV Agents as Calcium Channel Blockers01:20

Antiarrhythmic Drugs: Class IV Agents as Calcium Channel Blockers

2.8K
Class IV antiarrhythmic drugs, such as verapamil and diltiazem, block calcium channels. They primarily affect the heart, slowing the conduction in calcium-dependent tissues like the SA and AV nodes. These drugs manage reentrant supraventricular tachycardia (SVT) and reduce ventricular rate in atrial flutter/fibrillation.
Verapamil, a calcium channel blocker, inhibits calcium movement across myocardial cell membranes and vascular smooth muscle. This results in the dilation of coronary and...
2.8K
Transport Number01:31

Transport Number

250
The transport number is the fraction of the total current carried by an ion in an electrolyte solution. It is defined as the ratio of the current carried by a specific ion to the total current flowing through the solution. The transport number, t, is central to understanding ionic mobility, which describes how fast an ion moves under the influence of an electric field. This link connects the physical behavior of ions in solution to the chemical processes that occur during electrochemical...
250

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Crystallization of Membrane Proteins in Lipidic Mesophases
11:53

Crystallization of Membrane Proteins in Lipidic Mesophases

Published on: March 28, 2011

32.0K

チラルのコロイドのクラスター.

D Zerrouki1, J Baudry, D Pine

  • 1Laboratoire Colloïdes et Matériaux Divisés, ESPCI, UPMC, CNRS, ParisTech, 10 rue Vauquelin, 75005 Paris, France.

Nature
|September 19, 2008
PubMed
まとめ
この要約は機械生成です。

研究者らは,キラル構造に自己組み立てられる磁性コロイドダンベルを開発した. このブレークスルーは,材料に特定のハンドル性を生み出すための新しい方法を提供し,化学と材料科学の潜在的応用がある.

さらに関連する動画

Macrophage Cholesterol Depletion and Its Effect on the Phagocytosis of Cryptococcus neoformans
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Macrophage Cholesterol Depletion and Its Effect on the Phagocytosis of Cryptococcus neoformans

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Controlled-release of Chlorine Dioxide in a Perforated Packaging System to Extend the Storage Life and Improve the Safety of Grape Tomatoes
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Controlled-release of Chlorine Dioxide in a Perforated Packaging System to Extend the Storage Life and Improve the Safety of Grape Tomatoes

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関連する実験動画

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Crystallization of Membrane Proteins in Lipidic Mesophases
11:53

Crystallization of Membrane Proteins in Lipidic Mesophases

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Macrophage Cholesterol Depletion and Its Effect on the Phagocytosis of Cryptococcus neoformans
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Macrophage Cholesterol Depletion and Its Effect on the Phagocytosis of Cryptococcus neoformans

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Controlled-release of Chlorine Dioxide in a Perforated Packaging System to Extend the Storage Life and Improve the Safety of Grape Tomatoes
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Controlled-release of Chlorine Dioxide in a Perforated Packaging System to Extend the Storage Life and Improve the Safety of Grape Tomatoes

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科学分野:

  • コロイド科学とは,コロイドの科学である.
  • 材料科学は材料科学である.
  • 化学 化学は化学です.

背景:

  • チラリティは生物学,化学,物理学の基礎であり,生化学的経路に影響を与えます.
  • DNAのダブルヘリックス構造は,競合する長さのスケールから生じるキラリティの例です.
  • キラル構造を作り出すための制御可能な方法の開発は,科学的進歩にとって不可欠です.

研究 の 目的:

  • コロイド系においてキラリティを誘導するための単純な方法を探求する.
  • 制御されたヘリシティを持つキラル構造に自己組み立てのための磁性コロイドの設計と利用.
  • 非対称なコロイドダンベルを使用してキラル構造の形成をモデル化します.

主な方法:

  • 設計された非対称なコロイド式ダンベルは,磁気ベルトで結びついています.
  • 磁場を適用して,ベルトの自己組み立てを誘導し,チェーンにしました.
  • 非対称な球体からのステリック制約を活用して,チェーンカイルとキラル構造の形成を強制した.

主要な成果:

  • 磁性コロイドダンベルが自己組織化してキラル構造を形成することを示した.
  • スフィアの間の十分なサイズ比が,単一の予測可能なヘリシティ (右または左) につながることを示した.
  • 制御された自己組み立てにより,キラル型コロイドクラスターを成功裏に作成しました.

結論:

  • この研究は,磁気力と粒子の設計を使用して,コロイド系におけるキラリティを生成するための新しい経路を示しています.
  • 開発されたキラル型コロイドクラスターは,コロイド科学と化学の間の新しいつながりを提供します.
  • 潜在的な応用には,メソポリマー,光学材料,およびエナティオメリック分離のためのモデルとして使用することが含まれます.