Surface microtopography of lath-shaped hydrothermal illite by tapping-mode™ and contact-mode AFM

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Abstract

Lath-shaped hydrothermal illite particles in Izumiyama pottery stone were examined by contact-mode atomic force microscopy (CMAFM) and tapping-mode AFM (TMAFM) in air. With CMAFM, the lath-shaped particles showed interlacing patterns on the (001) surface in deflection images, while in height images such patterns were unclear. Also, evidence of artifacts caused by frictional forces between the surface and tip and/or edge effects were found in the CMAFM height images of the particle and Si substrate surfaces. In contrast, TMAFM showed interlacing patterns clearly in both amplitude and height images, and artifacts were barely evident. The TMAFM height images permitted the accurate measurement of 1.0- or 2.0-nm height steps corresponding to single or double mica layers, as well. Many lath-shaped particles in the Izumiyama hydrothermal illite exhibit interlacing patterns on their (001) surface, as shown by these AFM observations. The interlacing patterns are characterized by polygonal spirals with comparatively wide spacings and steps having a height of 1.0 or 2.0 nm. Generally a single lath-shaped particle has a single spiral center on the (001) surface, and 2 mica layers rotated 120° originate from the dislocation point. These support the view that lath-shaped illites belong to the 2A/, polytype. It is likely that these illite particles were formed by a uniform process of development that is characterized by very slow growth, spiral mechanisms in that growth and low supersaturation conditions.

Original languageEnglish
Pages (from-to)574-582
Number of pages9
JournalClays and Clay Minerals
Volume46
Issue number5
DOIs
Publication statusPublished - Jan 1 1998

Fingerprint

microtopography
microrelief
illite
atomic force microscopy
Atomic force microscopy
mica
artifact
Supersaturation
edge effect
supersaturation
edge effects
dislocation
deflection
particle
spacing
spatial distribution
substrate
Substrates
air
Air

All Science Journal Classification (ASJC) codes

  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth and Planetary Sciences (miscellaneous)

Cite this

Surface microtopography of lath-shaped hydrothermal illite by tapping-mode™ and contact-mode AFM. / Kuwahara, Yoshihiro; Uehara, Seiichiro; Aoki, Yoshikazu.

In: Clays and Clay Minerals, Vol. 46, No. 5, 01.01.1998, p. 574-582.

Research output: Contribution to journalArticle

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