2-Point correlation function of nanostructured materials via the grey-tone correlation function of electron tomograms: A three-dimensional structural analysis of ordered mesoporous silica

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• 作者：Cedric J. Gommes ; Heiner Friedrich ; Petra E. de Jongh ; Krijn P. de Jong
• 关键词：2-Point correlation ; Nanostructure ; Porous material ; Image analysis ; Transmission electron microscopy
• 刊名：Acta Materialia
• 出版年：2010
• 出版时间：February 2010
• 年：2010
• 卷：58
• 期：3
• 页码：770-780
• 全文大小：892 K

文摘

Electron tomography is a unique technique for imaging the microstructure of materials with a nanometer resolution. The signal-to-noise ratio of electron tomograms is, however, often too low for a reliable segmentation-based image analysis. We derive a general relation between the grey-tone correlation function of the tomograms and the 2-point correlation function of the morphology, which enables us to analyse quantitatively the grey-tone correlation function with a morphological model of the material. The methodology is applied to SBA-15 ordered mesoporous silica. The three-dimensional grey-tone correlation function obtained from electron tomography is analysed in terms of a hexagonal array of Gaussian independent pores. The model enables us to relate the morphology obtained from the 2-point correlation function to macroscopic characterization data of the material, notably small-angle X-ray scattering and nitrogen adsorption.