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Transmission electron microscopy of hexadecyltrimethylammonium-exchanged smectite

School of Earth and Environmental Sciences, Seoul National University, Seoul 151-742, Korea

^* E-mail: lsyblue{at}hanmir.com

(Received 5 February 2001; revised 22 November 2001)

The morphological and structural changes in smectite caused by hexadecyl-trimethylammonium (HDTMA) treatment were studied using X-ray diffraction (XRD) and transmission electron microscopy (TEM). The HDTMA-exchanged smectite shows not only morphological features such as irregular, wavy surface with curled edges, but also structural features such as large d-spacings (20–26 Å) and lattice distortions. The surface morphological heterogeneity is assumed to be related to the inhomogeneous intercalation of HDTMA cations into the interlayer of smectite.

KEYWORDS: smectite, hexadecyltrimethylammonium, X-ray diffraction, transmission electron microscopy, morphological heterogeneity, interlayer

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