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Kaolinite was delaminated by using a urea‐kaolinite complex via grinding. Grinding for 5 h, using a mechanical mortar, markedly increased the specific surface area of the kaolinate complex, which was mixed with 30 wt% urea, from 18 m 2 /g to 116 m 2 /g. Scanning electron microscopy of this sample indicated that the kaolinite particles were delaminated into very thin kaolinite particles.
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Tsunematsu et al. (1999) studied this question.
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