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Images of demineralized coal surfaces by scanning tunnelling microscopy

✍ Scribed by Hadi Zareie; Nurşen Öztaş; Mehtap Gündoǧan; Erhan Pişkin; Yuda Yürüm

Publisher
Elsevier Science
Year
1996
Tongue
English
Weight
302 KB
Volume
75
Category
Article
ISSN
0016-2361

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✦ Synopsis

Zonguldak bituminous coal was demineralized with HC1 and HF. Mineral removal was followed by classical chemical analysis and FT-i.r. spectroscopy to determine the types of inorganics dissolved. Scanning tunnelling microscopy (STM) images of the surfaces of original and acid-treated Zonguldak coal were compared with those of an original semianthracite and a highly oriented pyrolytic graphite. The scanning tunnelling microscope was operated in variable-current mode with an average tunnelling current of 20 pA and a bias voltage in the range 250-500mV. It was concluded that STM has great potential for the investigation of the structural changes occurring on coal surfaces due to different treatments.

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