Research Abstracts

A novel method for measuring local permeabilities of gas or vapor in polymers was proposed and developed. The method utilizes a thin reactive layer of potassium prepared on one side of the examined polymer film. Molecules of an appropriate gas (oxygen, water vapor) diffusing through the film corrode

Composition of a polymeric potential-determining phase for the ibuprofen selective electrode was determined. The different possibilities of using various quaternary ammonium salts — dimethyldidecylammonium bromide, methyltrioctylammonium chloride, tetraoctylammonium chloride and methyltrioctyloammon

An optimal new PVC membrane sensor for Cd2+ ions based on TRIAR 3-(2’,4’dihydroxyphenylazo-1’)-1,2,4 triazol as the active substance was prepared. Its basic analytical parameters such as slope characteristics; detection limit; lifetime; response time; selectivity for zinc, nickel, cobalt, calcium, c

In this study, the membrane extraction of phenol-4-aminoantipyrine complex with the series of aliphatic alcohols was investigated by monitoring the efficiency of the process. A commercial polysulphone hollow-fiber membrane module was used in all experiments. The effects of feed and extragent stream

A five-channel taste module based on ion-selective electrodes (ISE) with lipid-polymer membranes was constructed. Five different kinds of lipids or their derivatives were used in PVC membranes as substances transforming taste information into electric signals: benzylcetyldimethylammonium chloride mo

The extraction of short peptides through a supported liquid membrane containing di-2-(ethylhexyl)phosphoric acid (D2EHPA) as a carrier was investigated. The extraction was carried out from the aqueous donor phase with pH 3 to a more acidic acceptor phase. The proton gradient between the donor and th

A mathematical model has been developed to simulate the performance of an integrated extraction-stripping process based on the use of hollow fiber contactors. The model allows one to predict the time-dependent concentration profiles of the two phases involved in an individual extraction or stripping

HYFLON AD membranes are very interesting devices in water treatment and for their impermeability to water and gases and vapour transpirability [1]. In these kinds of processes, such in many large-scale processes, some membrane parameters are particularly important, among them: pore distribution, mem

Organic–inorganic membranes for direct methanol fuel cell (DMFC) application were prepared from sulfonated polyether ether ketone (SPEEK), containing heteropolyacids and an oxide phase either generated by hydrolysis ofamino-modified silanes or by dispersion of a surface-modified fumed silica. The he

The emf method has been compared with the conductometric one in determining the apparent electrolyte permeability of membrane ( ). It has been found that this method is limited to the membranes of low permeability ( of the order 10!7 m/s). In order to obtain the real permeability coefficient (Ps), t