関連する実験動画
Updated: Jul 8, 2025

09:26
Synthesis and Characterization of Supramolecular Colloids
Published on: April 22, 2016
9.8K
シリカナノスフィアの組立における強化された静電排斥:体中心の立方体コロイド結晶の形成ダイナミクス
Qingsong Fan1, Zhiwei Li1, Yichen Li1
1Department of Chemistry, University of California, Riverside, Riverside, California 92521, United States.
Journal of the American Chemical Society
|December 13, 2023
まとめ
酸処理は,コロイド性シリカナノスフィアの長距離電気静的相互作用を効果的に確立し,低濃度で結晶の組み立てを可能にします. この方法は,効率的で調節可能な光学結晶の開発のために,電気的二重層の厚さを高めます.
科学分野:
- 材料科学
- コロイド科学
- ナノテクノロジー
背景:
- コロイド性シリカの組み立てには,伝統的に高い粒子の濃度と広範な処理が必要です.
- 制限には,遠距離電気静的相互作用を確立し,結晶形成を制御する困難が含まれます.
- 透析のような既存の方法は 静電相互作用を高めるのに時間がかかります
研究 の 目的:
- コロイドのシリカナノスフィアを結晶に組み込むための新しい,時間効率の良い方法を開発する.
- コロイド結晶化における静電相互作用と電気二重層 (EDL) 厚さの役割を調査する.
- 低濃度で結晶形成に影響を与える自己組み立てのメカニズムと要因を調査する.
主な方法:
- 閉じ込められたイオン (例えば,NH4+) を除去するためにコロイドのシリカナノスフィアの酸処理.
- 強化された静電相互作用と増加した電気二重層 (EDL) の厚さの特徴.
- コロイド結晶形成の観察と構造分析 (例えば,体中心の立方格子).
主要な成果:
- 酸処理による遠距離静電相互作用の有効な確立
- EDLの厚さが大幅に増加し,非常に低い粒子の濃度で組み立てを容易にする.
- 体中心の立方体結晶の形成は,幅広いスペクトルの調節性と,多分散性に対する高い耐性を有する.
- 熱力学および運動的要因の影響を受けた結晶化中の乱れ-秩序の移行の観察.
結論:
- 酸処理は,コロイド性シリカの自己組み立てを誘導するための非常に効果的で時間効率の良い方法です.
- 強化されたEDLの厚さは,低濃度のコロイド結晶化と望ましい格子構造の達成に不可欠です.
- このアプローチは,様々な用途のためのコロイドシリカベースの光学結晶の設計と機能化のための経路を提供します.
関連する概念動画
Colloidal precipitates
593
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...
593
Colloids
17.5K
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 that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
17.5K
Ionic Crystal Structures
14.4K
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...
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...
14.4K
Van der Waals Interactions
64.0K
Atoms and molecules interact with each other through intermolecular forces. These electrostatic forces arise from attractive or repulsive interactions between particles with permanent, partial, or temporary charges. The intermolecular forces between neutral atoms and molecules are ion–dipole, dipole–dipole, and dispersion forces, collectively known as van der Waals forces.
64.0K

