On the Preparation of Collodion Membranes of Differential Permeability

The Permeability of Thin Dry Collodion Membranes

Dry thin collodion membranes have been prepared which are permeable to water, ammonia, weak acids of low molecular weight, HCl gas, O(2), CO(2), and H(2)S, but are impermeable to strong electrolytes and substances of high molecular weight. The permeability to gases does not depend on the density, so that the gases do not pass through pores in the membrane.

The Permeability of Dry Collodion Membranes. Ii

The rate of penetration and the solubility of H, O, N, NH(3), H(2)O, HCl gas, CO(2), formic, acetic, chloracetic, dichloracetic acid, glycerol, phenol and mercury bichloride in dry collodion membranes have been measured. The rate of penetration of H and CO(2) is the same whether the membrane and gas are dry or whether the membrane is immersed in water. The solubility of CO(2), acetic acid, phen...

The Preparation of Flexible Collodion Membranes

the effect of taftan pozzolan on the compressive strength of concrete in the environmental conditions of oman sea (chabahar port)

cement is an essential ingredient in the concrete buildings. for production of cement considerable amount of fossil fuel and electrical energy is consumed. on the other hand for generating one tone of portland cement, nearly one ton of carbon dioxide is released. it shows that 7 percent of the total released carbon dioxide in the world relates to the cement industry. considering ecological issu...

the effect of explicit teaching of metacognitive vocabulary learning strategies on recall and retention of idioms

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