CHARACTERISTICS OF FINE PORES IN SOME HALLOYSITES

被引:79
作者
CHURCHMAN, GJ [1 ]
DAVY, TJ [1 ]
AYLMORE, LAG [1 ]
GILKES, RJ [1 ]
SELF, PG [1 ]
机构
[1] UNIV WESTERN AUSTRALIA,FAC AGR,NEDLANDS,WA 6009,AUSTRALIA
关键词
D O I
10.1180/claymin.1995.030.2.01
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Isotherms were obtained for nitrogen adsorption and desorption on seven halloysite-rich samples from New Zealand and Western Australia. Calculations from these isotherms indicate that halloysites with mainly small particles (< c. 0.08 mu m in width) had abundant cylindrical pores with narrow size distributions in the 5-15 nm range. They also indicate that halloysites with mainly large particles (> c. 0.1 mu m in width) had few if any pores in the mesopore range (2-50 nm). Transmission electron microscopy (TEM) shows that cylindrical pores originate from the central holes in tubular particles. The TEM also suggests that slit-shaped pores can originate from the shrinkage of blocks of layers upon dehydration of halloysite.
引用
收藏
页码:89 / 98
页数:10
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