Abstract
Surface properties between freeze-dried and air-dried clays were compared. Allophane and imogolite clays (<2μEm) were leached with 1M NaC1 and washed with or dialyzed against water. One part of these clays was freeze-dried and the other part air-dried. Water vapor adsorption and EGME and N2 surface-areas of both freeze-dried and airdried clays were measured.
The amounts of water vapor adsorbed at relative humidities of from 0.15 to 0.79 and EGME and N2 specific-surface-areas of freeze-dried and air-dried clays were almost the same with each other. The difference was only found at the amounts of water vapor adsorbed at a relative humidity of 0.93, which were larger for freeze-dried clays than for air-dried ones, especially for allophane. This difference was interpreted in terms of the difference in the interaggregate porosity between freeze-dried and air-dried clays.
