相关实验视频

Updated: Jun 19, 2025

A Simple Method for the Size Controlled Synthesis of Stable Oligomeric Clusters of Gold Nanoparticles under Ambient Conditions

A Simple Method for the Size Controlled Synthesis of Stable Oligomeric Clusters of Gold Nanoparticles under Ambient Conditions

Published on: February 5, 2016

聚积压缩促进了金纳米颗粒的腐蚀

Borys A Snopok¹, Shavkat N Nizamov², Tetiana V Snopok¹

¹VE Lashkaryov Institute of Semiconductor Physics, NAS of Ukraine 41 pr. Nauki Kyiv 03028 Ukraine snopok@isp.kiev.ua.

Nanoscale advances

|July 25, 2024

概括

像金纳米粒子 (GNPs) 这样的工程纳米粒子聚合在强酸性溶液中,而不是溶解. 这种聚合是由近距离的吸引力驱动的,导致它们从悬浮中消失.

科学领域:

材料科学材料科学材料科学
纳米技术纳米技术
物理化学物理化学

背景情况:

工程纳米粒子得到广泛应用,但它们在恶劣环境中的行为仍然不清楚.
了解纳米粒子降解机制对于预测它们的命运和影响至关重要.

研究的目的:

在酸性过氧化溶液中研究酸稳定黄金纳米粒子 (GNP) 的降解机制.
在特定环境条件下量化纳米粒子聚合和尺寸.

主要方法:

使用光学光谱和纳米粒子跟踪分析.
研究了50nm酸盐稳定黄金纳米粒子 (GNPs) 在HCl溶液中与H2O2.
分析了纳米粒子聚合,大小和降解途径.

主要成果:

观察到,GNP从悬浮中消失的原因是聚合物形成,而不是溶解.
高离子强度中和静电屏蔽,使纳米粒子接近.
卡西米尔和范德瓦尔斯力在亚纳米距离上占主导地位,促进了聚合.

结论:

在恶劣环境中纳米颗粒的降解主要是由聚合驱动的.
近场力和减少双电层厚度,促进了新的化学反应途径.
这些发现提供了关于复杂溶液中纳米粒子稳定性和反应性的见解.

更多相关视频

Synthesis and Characterization of Amphiphilic Gold Nanoparticles

Synthesis and Characterization of Amphiphilic Gold Nanoparticles

Published on: July 2, 2019

Synthesis and Catalytic Performance of Gold Intercalated in the Walls of Mesoporous Silica

Synthesis and Catalytic Performance of Gold Intercalated in the Walls of Mesoporous Silica

Published on: July 9, 2015

相关概念视频

Colloidal precipitates

Colloidal precipitates

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...