质量,直径,密度和表面性能的表征体纳米粒子通过电荷检测质谱法实现了
Conner C Harper1, Jacob S Jordan1, Steven Papanu2
1Department of Chemistry, University of California, Berkeley, California 94720-1460, United States.
ACS nano
|June 24, 2024
概括
电荷检测质谱 (CDMS) 提供快速,准确的纳米粒子特征,补充传输电子显微镜 (TEM). CDMS提供精确的质量和直径数据,使合纳米粒子的密度确定和表面特性分析成为可能.
科学领域:
- 纳米技术纳米技术
- 分析化学 分析化学
- 材料科学 材料科学 材料科学
背景情况:
- 合纳米粒子的表征通常采用散射,显微镜和移动性方法.
- 传输电子显微镜 (TEM) 被广泛认为是纳米粒子大小分布分析的黄金标准.
- 电荷检测质谱 (CDMS) 为单个纳米粒子质量和电荷测量提供了一个替代的,高精度的方法.
研究的目的:
- 将TEM和CDMS用于纳米粒子表征的互补方面进行比较和探索.
- 为了评估CDMS与TEM之间的精度和速度,以确定纳米粒子尺寸分布.
- 评估CDMS与TEM一起用于确定纳米粒子密度和表面特性的实用性.
主要方法:
- 使用TEM和CDMS对两个低多分散性纳米粒子标准 (共聚物和聚烯) 的表征.
- 通过CDMS,快速获取数千个单个纳米粒子离子的质量和直径分布.
- 从TEM图像分析和CDMS质量数据中获得的直径分布的比较分析.
主要成果:
- 由于样本准备和分析时间缩短,CDMS提供了快速的质量和直径分布,超过了TEM的速度.
- 由于图像对图像的差异,TEM显示平均直径的1-2纳米变化,而CDMS基于~1%的质量精度实现了0.3纳米直径的不确定性.
- 对于已知密度的聚乙烯纳米颗粒,CDMS和TEM直径分布一致;对于共聚物纳米颗粒,将TEM直径与CDMS质量结合以准确确定密度.
- 使用CDMS观察到纳米粒子充电行为的差异表明对表面性能的敏感性,使混合样本与重叠质量分布的分离成为可能.
结论:
- CDMS是一个有价值的,快速,精确的替代品/补充TEM纳米粒子表征.
- CDMS和TEM的组合使得纳米粒子密度的准确确定,并提供了对表面特性的洞察力.
- 基于表面电荷特征的CDMS促进了纳米颗粒混合物的分化和分离.
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