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Research and development of the process for production of extra pure ammonium aluminium sulphate I
Rodová, A. ; Wildnerová, M. ; Janoš, P. ; Bezucha, P. ; Domský, V. ; Hostomský, Jiří ; Hostomská, Věra ; Velická, Jana
Research and development of the process for production of extra pure ammonium aluminium sulphate, where the concentration of contaminants does not exceed 0.3 ppm for Ca, Co, Cr, Fe, Mg, Mn, Pb, Si, Ti, Zn, 2.0 ppm for Ga, and Na and 3.0 ppm for K. Evaluation of suitable raw materials; analytical methods for determination of contaminant concentrations; determination of phase equilibria in the system sulphuric acid ů ammonium sulphate ů aluminium sulphate ů water.
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Electrochemistry in the Medium of PMMA Gel Electrolytes
Reiter, Jakub ; Vondrák, Jiří ; Sedlaříková, M. ; Velická, Jana ; Nečesal, P.
Polymer gel electrolytes are used in the electrochemistry of lithium batteries and electrochromic devices. Their investigation started in our department in 1997, when first results were published on the International Seminar on Inclusion Compounds. Investigation of electric conductivity showed, that the specific conductivity of a 0.25 M LiBF4 solution was not lowered by an addition of solid PMMA polymer more than by 40-50%. We have developed a new method preparation of gel polymer electrolyte: after a mixung of anhydrous perchlorate solution in propylencarbonate (lithium, sodium, cadmium and other sals) with monomeric and oligomeric metylmetacrylate we hawe obtained an elastic and homogenous polymer with good optical properties.
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