22554
Both the nanoscale structure and the chemical composition of the mesoporous materials were analyzed by a combination of scanning and transmission electron microscopy , grazing incidence small - angle X - ray scattering , X - ray photoelectron spectroscopy , and time - of - flight secondary ion mass spectrometry .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: Chemical 
Text: {0} 
Answer:
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