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関連する概念動画

Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
Ionic Crystal Structures02:42

Ionic Crystal Structures

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...
Factors Affecting Dissolution: Polymorphism, Amorphism and Pseudopolymorphism01:21

Factors Affecting Dissolution: Polymorphism, Amorphism and Pseudopolymorphism

Polymorphism refers to the existence of a drug substance in multiple crystalline forms, known as polymorphs. Recently, this term has been expanded to include solvates (forms containing a solvent), amorphous forms (non-crystalline forms), and desolvated solvates (forms from which the solvent has been removed).
Some polymorphic crystals possess lower aqueous solubility than their amorphous counterparts, leading to incomplete absorption. For instance, the oral suspension of Chloramphenicol, which...
Solubility03:00

Solubility

Solution, Solubility, and Solubility Equilibrium
A solution is a homogeneous mixture composed of a solvent, the major component, and a solute, the minor component. The physical state of a solution—solid, liquid, or gas—is typically the same as that of the solvent. Solute concentrations are often described with qualitative terms such as dilute (of relatively low concentration) and concentrated (of relatively high concentration).
In a solution, the solute particles (molecules, atoms, and/or ions)...
Micelles01:30

Micelles

Micelle formation is an intricate process that hinges on the properties of amphiphilic or amphipathic molecules and the conditions of the system in which they are found. Amphiphilic molecules, which have both hydrophilic (water-attracting) and hydrophobic (water-repelling) parts, play a critical role in this process.In aqueous environments, these molecules arrange themselves such that their hydrophilic heads are turned towards the water phase, while their hydrophobic tails are oriented away...
Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...

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Updated: Jun 18, 2026

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
06:44

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding

Published on: March 24, 2018

アンフィフィリックな有機結晶.

J J Segura1, A Verdaguer, M Cobián

  • 1Centre d'Investigació en Nanociència i Nanotecnologia, CIN2 (CSIC-ICN), Edifici CM7, Esfera UAB, Campus de Bellaterra, E-08193 Barcelona, Spain.

Journal of the American Chemical Society
|November 18, 2009
PubMed
まとめ
この要約は機械生成です。

アンフィフィリックな性質,つまり水を引き寄せ,反撃する能力は,L-アラニンなどの結晶固体で実証されています. この発見は,有機分子を超えて分子結晶の概念を拡張し,二極の起源を明らかにします.

さらに関連する動画

From Constructs to Crystals &#8211; Towards Structure Determination of &#946;-barrel Outer Membrane Proteins
09:55

From Constructs to Crystals – Towards Structure Determination of β-barrel Outer Membrane Proteins

Published on: July 4, 2016

High-throughput Crystallization of Membrane Proteins Using the Lipidic Bicelle Method
07:26

High-throughput Crystallization of Membrane Proteins Using the Lipidic Bicelle Method

Published on: January 9, 2012

関連する実験動画

Last Updated: Jun 18, 2026

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
06:44

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding

Published on: March 24, 2018

From Constructs to Crystals &#8211; Towards Structure Determination of &#946;-barrel Outer Membrane Proteins
09:55

From Constructs to Crystals – Towards Structure Determination of β-barrel Outer Membrane Proteins

Published on: July 4, 2016

High-throughput Crystallization of Membrane Proteins Using the Lipidic Bicelle Method
07:26

High-throughput Crystallization of Membrane Proteins Using the Lipidic Bicelle Method

Published on: January 9, 2012

科学分野:

  • マテリアルサイエンス 材料科学
  • 表面科学とは,地表科学である.
  • クリスタログラフィーです.

背景:

  • アンフィフィリシティ,すなわち双重の水性および水害性の性質は,通常,フォスフォリピドや表面活性物質などの有機分子と関連しています.
  • この特性は,ジャヌス粒子やパターンの表面を含む人工構造に拡張されています.

研究 の 目的:

  • 結晶固体のアンフィフィリックな性質を証明し説明する.
  • 水蒸気にさらされたときのl-アラニン結晶の振る舞いを調査するために.
  • 分子結晶におけるアンフィフィリシティの根本的なメカニズムを解明する.

主な方法:

  • 原子力顕微鏡 (AFM) による,l-アラニンの異なる割れ面での測定.
  • 分子相互作用と表面の振る舞いを分析するためのコンピュータシミュレーション.
  • 水蒸気に結晶表面を晒し,対照的な反応を観察する.

主要な成果:

  • L-アラニン結晶は,様々な表面で水を引き寄せ,反発させ,アンフィフィリックな行動を示します.
  • 原子力顕微鏡では,水蒸気との明確な表面相互作用が明らかになりました.
  • コンピューター・シミュレーションにより,このアンフィフィリティの起源として分子の二極性の性質が特定されました.

結論:

  • アンフィフィリティは有機分子に限定されず,結晶固体にも見られます.
  • 分子結晶内の二極相互作用は,それらの両極性特性を支配する.
  • この発見は,他の二極分子結晶にも一般化できます.