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Characterization of Defects and Surface Structures in Microporous Materials by HRTEM, HRSEM, and AFM

Published online by Cambridge University Press:  17 March 2004

Gema González ,
Werner Stracke ,
Zoraya Lopez ,
Ulrike Keller ,
Andrea Ricker  and
Rudolf Reichelt
Gema González
Affiliation:
Centro Tecnológico, Laboratorio de Materiales, Instituto Venezolano de Investigaciones Científicas, Apdo. 21827, Caracas 1020 A, Venezuela
Werner Stracke
Affiliation:
Institut fuer Medizinische Physik und Biophysik, Universitaetsklinikum, Universitaet Muenster, Robert-Koch-Str. 31, D-48149 Muenster, Germany
Zoraya Lopez
Affiliation:
Centro Tecnológico, Laboratorio de Materiales, Instituto Venezolano de Investigaciones Científicas, Apdo. 21827, Caracas 1020 A, Venezuela
Ulrike Keller
Affiliation:
Institut fuer Medizinische Physik und Biophysik, Universitaetsklinikum, Universitaet Muenster, Robert-Koch-Str. 31, D-48149 Muenster, Germany
Andrea Ricker
Affiliation:
Institut fuer Medizinische Physik und Biophysik, Universitaetsklinikum, Universitaet Muenster, Robert-Koch-Str. 31, D-48149 Muenster, Germany
Rudolf Reichelt
Affiliation:
Institut fuer Medizinische Physik und Biophysik, Universitaetsklinikum, Universitaet Muenster, Robert-Koch-Str. 31, D-48149 Muenster, Germany
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Abstract

High-resolution transmission (HRTEM) and high-resolution scanning electron microscopy as well as atomic force microscopy (AFM), X-ray diffraction, and electron diffraction were used for studying the zeolites MFI, MEL, and the MFI/MEL intergrowth system. All three zeolites consisted of individual particles having a size in the range of approximately 0.5 μm to 5 μm. The particle habits varied from rather cubelike to almost spherelike with many intermediate habits. Typically, the particles of these three zeolites were assembled by many individual blocks that differed in the dimension from about 25 nm to 140 nm as well as in the shape from very frequently almost rectangular (for MFI, MEL, and MFI/MEL) to sometimes roundish or irregular habits (mainly for MFI/MEL). An estimate shows that some 104 up to more than 106 densely packed blocks typically may assemble each individual zeolite particle or, related to the corresponding unit cell dimension, about 108 up to 1010 unit cells. The fine surface structure of zeolite particles was terracelike with steps between adjacent terraces typically in the range of 20 nm to 60 nm; the minimum step measured was approximately 4 nm. A detailed study of the surface topography was performed by AFM, detecting organic molecules at the block intersections. The presence of topological defects was observed by HRTEM and electron diffraction.

Keywords

zeolitesMFIMELMFI/MEL intergrowthdefect structuresurface structuretransmission electron microscopyfield emission scanning electron microscopyatomic force microscopyX-ray diffraction
Type
Papers from the InterAmerican Congress on Electron Microscopy
Information
Microscopy and Microanalysis , Volume 10 , Issue 2 , April 2004 , pp. 224 - 235
Copyright
© 2004 Microscopy Society of America

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