Pham Till

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Under appropriate conditions, both surface areas and cation exchange capacities of clay minerals can be measured by absorption of methylene blue from aqueous solutions. The method has been applied to two kaolinites, one illite, and one montmorillonite, all initially saturated with Na + ions. For Na-montmorillonite, the total area, internal plus external, is(More)
According to the Lincoff's procedure, a cryoprobe is used for the localization of retinal holes. A cryo-marker developed for Keeler-cryoprobes simplifies the marking of the scleral impression of the cryoprobe, which is often invisible after thawing. The cryo-marker is fixed on the cryoprobe before cryotherapy. During thawing the toothed ring of the(More)
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