In Memoriam: Josip Kratohvil (1928 – 2020)

Josip Kratohvil (February 26, 1928 - May 9, 2020) received his bachelor\u27s degree in chemistry at the University of Zagreb in 1952 followed by his doctoral degree in physical chemistry in 1954. He served as a junior faculty member at the University of Zagreb, followed by a year in London and Ottawa in post-doctoral programs. In 1952, he married Stanka Babić, a colleague at the university. Together, they left Croatia in search of a better life and emigrated to the United States in 1960, making Potsdam their home. For over 40 years, he held a number of positions at Clarkson University, including Professor of Chemistry and Director of the Institute of Colloid and Surface Science. In 1998, he was made Professor Emeritus. He was the editor of the Journal of Colloid and Interface Science and published more than 60 scientific papers in the area of colloid chemistry, which he described for the layman as "the science of very small matter." He was a longtime member of the Advisory Board of the journal Croatica Chemica Acta. This work is licensed under a Creative Commons Attribution 4.0 International License

In Memoriam: Josip Kratohvil (1928 – 2020)

Josip Kratohvil (February 26, 1928 - May 9, 2020) received his bachelor\u27s degree in chemistry at the University of Zagreb in 1952 followed by his doctoral degree in physical chemistry in 1954. He served as a junior faculty member at the University of Zagreb, followed by a year in London and Ottawa in post-doctoral programs. In 1952, he married Stanka Babić, a colleague at the university. Together, they left Croatia in search of a better life and emigrated to the United States in 1960, making Potsdam their home. For over 40 years, he held a number of positions at Clarkson University, including Professor of Chemistry and Director of the Institute of Colloid and Surface Science. In 1998, he was made Professor Emeritus. He was the editor of the Journal of Colloid and Interface Science and published more than 60 scientific papers in the area of colloid chemistry, which he described for the layman as "the science of very small matter." He was a longtime member of the Advisory Board of the journal Croatica Chemica Acta. This work is licensed under a Creative Commons Attribution 4.0 International License

Nekrolog - Marta Fustić

Marta Fustić (1913.-1957.

Light Scattering Determination of the Molecular Weights of the Ammodytes Viper Venom, its Antivenin and Their Aggregates

A light scattering determination of the molecular weights of the venom of Viperae Ammodytes, its antivenin and their aggregates in 0.15 M sodium chloride solutions were performed. Venom and antivenin were extensively dialyzed against water or sodium chloride solution. The weight-average molecular weight of the venom amounted to 43,600, and of the antivenin (pepsin digested) to 83,000. The size of the venom-antivenin aggregates depended upon the time of the reaction and the venom-antivenin ratio. The corresponding molecular weights varied from 202 ,000 to 4,800,000. The results were compared with the investigation on similar systems, a nd the significance of the results was discussed

Methorics of the Precipitation Processes. XI. The Complex Solubility of Silver Halides and Silver Thiocyanate in Mixed Solvents

The complex solubility of silver chloride, bromide, iodide, and thiocyanate in halide or thiocyanate solutions in isodielectric mixtures of water-methanol, water-ethanol and water-acetone was determined. Complex solubility of these precipitates increased, in regard to water, with increasing concentration of the organic component in solutions. The increase of complex solubility was nearly the same for water-methanol and water-ethanol mixtures of the same dielectric constant, but the change of complex solubility in corresponding water-acetone mixtures was much greater

Methorics of Coagulation Processes. XII.* The Influence of the Composition and the Properties of Solvent on the Coagulation of Negative Silver Halide Sols

The results of coagulation measurements on negative silver halide sols in statu nascendi in water- ethanol, water-acetone, water- dioxane, and water-glycine solutions are given. In the majority of cases a lowering of the dielectric constant of the coagulating medium causes a decrease of the coagulation values, but there are also cases in which the contrary behaviour has been observed. The results are interpreted on the basis of the present theories of the stability of lyophobic colloids

Nekrolog - Marta Fustić

Marta Fustić (1913.-1957.

Methorics of the Precipitation Processes. XV. Some Further Experiments on the Influence of the Solvent on the Complex Solubility of Silver Halides and Silver Thiocyanate*

The complex solubility of silver chloride, silver bromide, silver iodide, and silver thiocyanate in halide or thiocyanate solutions in isodielectric mixtures of water with n-propanol, iso-propanol, ethylene glycol, glycerol or dioxane was · determined. The increase of the complex solubility was nearly the same for the isodielectric mixtures of water with alcohols irrespective of the alcohol used. Dioxane showed ,some specific action. The results obtained are compared with previously reported data

Methorics of the Precipitation Processes. XI. The Complex Solubility of Silver Halides and Silver Thiocyanate in Mixed Solvents

The complex solubility of silver chloride, bromide, iodide, and thiocyanate in halide or thiocyanate solutions in isodielectric mixtures of water-methanol, water-ethanol and water-acetone was determined. Complex solubility of these precipitates increased, in regard to water, with increasing concentration of the organic component in solutions. The increase of complex solubility was nearly the same for water-methanol and water-ethanol mixtures of the same dielectric constant, but the change of complex solubility in corresponding water-acetone mixtures was much greater