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関連する概念動画

Ionic Radii03:10

Ionic Radii

33.9K
Ionic radius is the measure used to describe the size of an ion. A cation always has fewer electrons and the same number of protons as the parent atom; it is smaller than the atom from which it is derived. For example, the covalent radius of an aluminum atom (1s22s22p63s23p1) is 118 pm, whereas the ionic radius of an Al3+ (1s22s22p6) is 68 pm. As electrons are removed from the outer valence shell, the remaining core electrons occupying smaller shells experience a greater effective nuclear...
33.9K
Ionic Bonds00:42

Ionic Bonds

132.2K
Overview
When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.
Opposing Charges Hold Ions Together in Ionic Compounds
Ionic bonds are reversible electrostatic interactions between ions...
132.2K
Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

49.8K
Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions. 
49.8K
Solubility of Ionic Compounds02:55

Solubility of Ionic Compounds

68.3K
Solubility is the measure of the maximum amount of solute that can be dissolved in a given quantity of solvent at a given temperature and pressure. Solubility is usually measured in molarity (M) or moles per liter (mol/L). A compound is termed soluble if it dissolves in water.
68.3K
Molecular and Ionic Solids02:54

Molecular and Ionic Solids

20.3K
Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
20.3K
Ionic Crystal Structures02:42

Ionic Crystal Structures

17.9K
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...
17.9K

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関連する実験動画

Updated: Feb 13, 2026

Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly
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Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly

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配列で定義されたイオンペプトイドブロックコポリマーの溶液自組

Garrett L Sternhagen1, Sudipta Gupta1, Yueheng Zhang2

  • 1Department of Chemistry and Macromolecular Studies Group , Louisiana State University , Baton Rouge , Louisiana 70803 , United States.

Journal of the American Chemical Society
|March 7, 2018
PubMed
まとめ
この要約は機械生成です。

イオン性ペプトイドブロックコポリマーは,調節可能な球状ミセルに自己組み立てられます. 離子モノメアの位置を正確に制御することで,ミセルサイズと集積が決定され,ナノ構造を設計する新しい方法が提供されます.

さらに関連する動画

Synthesis of Monodisperse Cylindrical Nanoparticles via Crystallization-driven Self-assembly of Biodegradable Block Copolymers
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Synthesis of Monodisperse Cylindrical Nanoparticles via Crystallization-driven Self-assembly of Biodegradable Block Copolymers

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Anionic Polymerization of an Amphiphilic Copolymer for Preparation of Block Copolymer Micelles Stabilized by π-π Stacking Interactions
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Anionic Polymerization of an Amphiphilic Copolymer for Preparation of Block Copolymer Micelles Stabilized by π-π Stacking Interactions

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関連する実験動画

Last Updated: Feb 13, 2026

Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly
09:34

Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly

Published on: February 6, 2020

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Synthesis of Monodisperse Cylindrical Nanoparticles via Crystallization-driven Self-assembly of Biodegradable Block Copolymers
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Synthesis of Monodisperse Cylindrical Nanoparticles via Crystallization-driven Self-assembly of Biodegradable Block Copolymers

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Anionic Polymerization of an Amphiphilic Copolymer for Preparation of Block Copolymer Micelles Stabilized by π-π Stacking Interactions
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Anionic Polymerization of an Amphiphilic Copolymer for Preparation of Block Copolymer Micelles Stabilized by π-π Stacking Interactions

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科学分野:

  • ポリマー化学
  • 材料科学
  • ナノテクノロジー

背景:

  • アンフィフィリックブロックコポリマーがミセルに自己組み立てられる.
  • ミセルの構造を制御することは,アプリケーションにとって極めて重要です.
  • イオンモノメアは電荷を導入し,自己組織化に影響を与えます.

研究 の 目的:

  • イオン性ペプトイドブロックコポリマーを合成し,特徴づけること.
  • イオン単体数と位置がミセル構造に与える影響を調べる.
  • 適合したミセルの形成のための構造-性質の関係を確立する.

主な方法:

  • ブロックコポリマーのサブモノマー合成
  • pH制御された水溶解と自己組み立て
  • 構造分析のための小角中性子散射 (SANS).

主要な成果:

  • イオン含量と位置を制御した合成ペプトイドブロックコポリマー.
  • 低臨界ミセラ濃度 (CMC) の球状ミセラ (5~10 nm半径) に自己組み立てを観察した.
  • 結合からの離離子単体距離に伴い,ミセルの集積数と半径が増加することを発見した.

結論:

  • ブロックコポリマーのイオン単体位置を正確に制御することで,ミセルサイズと集積を微調整することができます.
  • 特定の性質を持つナノ構造を設計する方法を実証した.
  • 発見は,電荷を帯びたポリマーの理論モデルと一致しています.