在石中水吸附时的晶格变化,用in situ原子力显微镜测量
Francisco Gallego-Gómez1, Eider Berganza1, Miguel Morales1
1Instituto de Ciencia de Materiales de Madrid (ICMM), Consejo Superior de Investigaciones Científicas (CSIC) Calle Sor Juana Inés de la Cruz 3 E-28049 Madrid Spain eider.berganza@csic.es a.blanco@csic.es.
Nanoscale advances
|April 7, 2025
概括
人工石,或合体光子晶体,在暴露于水蒸气时,显示可逆的晶格扩张. 这种直接使用原子力显微镜测量的胀是由于二氧化球水化.
科学领域:
- 材料科学:专注于研究合体光子晶体及其光学特性.
- 纳米技术:研究人工石的纳米结构和行为.
- 表面科学:研究环境蒸汽与材料表面的相互作用.
背景情况:
- 合体光子晶体 (人造光珠) 具有独特的光学特性,由它们有序的粒子排列决定.
- 格子参数对于控制光子带隙至关重要,这是一个关键的功能特征.
- 环境蒸汽吸附可以改变光子反应,通常归因于格子参数变化.
研究的目的:
- 在不同的环境条件下直接测量二氧化球晶石的结构和晶格参数变化.
- 为了研究水蒸气吸附对人工石的排列和周期性的影响.
- 为光子晶体中蒸汽诱导的胀机制提供直接证据.
主要方法:
- 使用*in situ*原子力显微镜 (AFM) 来对石进行实时测量.
- 采用图像处理相关性工具,利用岩结构的固有周期性进行分析.
- 精选的机械稳定的光珠,以确保可靠的数据采集和高分析分辨率.
主要成果:
- 在水吸附后直接观察到二氧化球晶石的可逆晶格增量.
- 测量了高达几纳米的格子扩张,与之前的间接估计一致.
- 与球内的微孔填充相关的观察到的胀.
结论:
- 水蒸气吸附导致可测量的,可逆的体光子晶体由球制成的膨胀.
- 观察到的晶格扩张与单个球的水化和膨胀直接相关.
- 这项研究为人工石中蒸汽诱导的结构变化的机制提供了直接的实验验证.
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