TEM image analysis and modelling: application to boehmite nanoparticles
TEM image analysis and modelling: application to boehmite nanoparticles
复制标题
TEM 图像分析和建模：在勃姆石纳米颗粒中的应用
DOI：
10.1111/j.1365-2818.2011.03560.x
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发表时间：
2012
影响因子：
2
通讯作者：
R. Revel
中科院分区：
文献类型：
--
作者：
M. Moreaud;D. Jeulin;V. Morard;R. Revel
勃姆石以纳米颗粒的形式存在。干燥后，它可以形成氧化铝，这是常见的催化剂载体用于炼油和石化。勃姆石氧化铝的拓扑结构转变引起了人们对这些纳米颗粒的精确形状和尺寸的兴趣，这些纳米颗粒与催化剂活性高度相关。勃姆石纳米颗粒可以通过透射电子显微镜观察到。虽然它们是高度聚集的，但用特定的随机模型方法（这里是稀释模型）对透射电子显微镜图像进行分析可以准确估计它们的大小。为了使用这种方法，必须去除纳米颗粒边缘的电子噪声和衍射伪影。可以对显微照片进行协方差测量。它们可以用来拟合模型。拟合采用了一种新的数值方法来估计协方差的谷物。该模型可以考虑纳米颗粒的特定取向。本文研究了噪声的影响，用于去除噪声和衍射伪影的图像滤波器，以及模型的各个参数。我们提出了基于单个和两个颗粒混合模型的纳米颗粒尺寸估计程序。
Boehmite occurs in the form of nanoparticles. Upon drying, it can form the alumina that is common in catalyst support used in refining and petrochemicals. The topotactic transformation of boehmite alumina led to an interest in the precise shape and size of these nanoparticles which is highly linked to the catalyst activity. Boehmite nanoparticles can be observed by transmission electron microscopy. Although they are highly aggregated, the analysis of transmission electron microscopy images with a specific random model approach, here a dilution model, can give an accurate estimate of their size. To use this approach, electronic noise and diffraction artefacts on the edges of the nanoparticles have to be removed. Covariance measurements on micrographs can be performed. They can be used to fit a model. The fitting uses a novel numerical method to estimate the covariogram of grains. The model can take into account the specific orientations of the nanoparticles. The influence of noise, image filters used to remove noise and diffraction artefacts, as well as all the parameters of the model are all studied in this paper. We propose nanoparticle size estimations procedures based on both single and mixture‐of‐two particle models.