アニゾトロピックナノ結晶の成長のモードとしての非対称インターフェイスアダトーム移動
Paul Z Chen1, Arianna Skirzynska1, Tiange Yuan2
1Department of Chemical Engineering & Applied Chemistry, University of Toronto, Toronto, ONM5S3E5, Canada.
Journal of the American Chemical Society
|October 13, 2022
まとめ
この研究は,近隣の側面に沿って非対称なアダトムの拡散によって誘導され,アニソトロピーを形成する,金ナノ棒のための新しいナノ結晶成長機構を明らかにしています.
科学分野:
- 材料科学
- ナノ科学
- クリスタルグラフィー
背景:
- クラシックな結晶の成長モデルは,アニゾトロプ的ナノ結晶の形成を説明するのに苦労します.
- 黄金のナノ棒のような多くのアニゾトロプ的ナノ結晶の成長は,まだ十分に理解されていません.
- 既存のフレームワークは複雑なナノ結晶の成長を解釈するには不完全である可能性があります.
研究 の 目的:
- 一般的な添加物なしで,ペンタツイン金ナノ棒の溶液相成長を調査する.
- 低超飽和度で観察されたアニソトロプ的成長の背後にあるメカニズムを解明する.
- 運動と熱力学的要因を組み込む洗練された成長モデルを開発する.
主な方法:
- ペンタツイン金ナノ棒の溶液相合成
- 時間の伝達電子顕微鏡で成長の動態を観察する.
- アダトムの拡散経路と面特有の運動学的分析.
主要な成果:
- 観察されたアニゾトロプ的成長は,古典的なモードから逸脱して,より低い超飽和度で好ましい.
- 近隣の側面に沿って運動的に制限された,非対称なアダトムの拡散を特定した.
- レイヤル・バイ・レイヤル・成長とインターフェイス・ディフュージョン・メディアド・ロングジューディナル・成長が同時に示されている.
結論:
- 金ナノ棒の形状アニソトロピーは,堆積率だけでなく,インターフェイス拡散率によって支配されます.
- 周囲の側面はアダトムの拡散と成長方向を媒介する上で重要な役割を果たします.
- 超飽和を制御すると,ナノ結晶の成長を理解するために不可欠な非対称なインターフェイス拡散を含む異なる運動現象が明らかになります.
関連する概念動画
Cytoskeletal Coordination in Cell Migration
4.8K
A migrating cell changes its shape during the cyclic events of attachment and detachment from the substratum and repositions the cell organelles correspondingly. These complex events are orchestrated by the dynamic cytoskeletal network comprising actin filaments, intermediate filaments, and microtubules. Cytoskeletal crosstalk — the direct and indirect communication between the different components — is crucial for this coordination. Direct communication involves various linker...
4.8K
Crystal Growth: Principles of Crystallization
2.4K
Crystallization is a phase transformation process in which crystals are precipitated from a supersaturated solution or formed from other sources. During crystallization, atoms or molecules arrange themselves into a well-defined, rigid crystal lattice to minimize energy.
Initiating crystallization involves manipulating the concentration of the solute and the temperature of the solution. Since crystal growth occurs when the ratio of concentration and solubility of the solute in the solvent...
Initiating crystallization involves manipulating the concentration of the solute and the temperature of the solution. Since crystal growth occurs when the ratio of concentration and solubility of the solute in the solvent...
2.4K
Cell Migration
17.1K
Cell migration, the process by which cells move from one location to another, is essential for the proper development and viability of organisms throughout their life. When cells are not able to migrate properly to their ordained locations, various disorders may occur. For example, disruption in cell migration causes chronic inflammatory diseases such as arthritis.
17.1K
X-ray Crystallography
24.1K
The size of the unit cell and the arrangement of atoms in a crystal may be determined from measurements of the diffraction of X-rays by the crystal, termed X-ray crystallography.
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
Diffraction
Diffraction is the change in the direction of travel experienced by an electromagnetic wave when it encounters a physical barrier whose dimensions are comparable to those of the wavelength of the light. X-rays are electromagnetic radiation with wavelengths about as long as the distance between neighboring...
24.1K
Anionic Chain-Growth Polymerization: Mechanism
2.1K
The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael...
2.1K


