Laboratory for Precipitation Processes

Laboratory for Precipitation Processes

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The activities of the Laboratory for Precipitation Processes

Precipitation is a common term for a series of physical-chemical processes, by which formation of a new phase takes place in a homogeneous system. Precipitation of sparingly soluble inorganic salts from aqueous solutions is one of operations by which considerable amounts of materials of different properties can be produced. As such this operation can satisfy the increasing demands of the rapid technological development. A principle aim of the research performed in the Laboratory for Precipitation Processes is to investigate the precipitation mechanisms of sparingly soluble biocompatible ionic salts and related materials, in order to find generic regularities that influence the physical-chemical properties of these materials and to prove that these properties depend on both, the thermodynamic and kinetic factors. Since these substances often precipitate at conditions far from equilibrium (high supersaturations), special attention is given to the role of precursor phases on the properties of final product (thermodynamically stable modifications). Another important parameter relevant for precipitation is a presence of additives (large organic molecules or polyelectrolytes) which can affect either nucleation, growth or aging of precipitate at their very low concentrations.

Equipment

Gemini 2380 (Micromeritics) for determination of specific surface area and pore size distributions

IR spectrophotometer (ATI Mattson Genesis)

UV-VIS spectrophotometer (Perkin Elmer Instruments, LAMBDA 36)

Thermoanalyzer (Mettler TG 50 with a TC 11 processor)

Electronic counting device (Coulter Counter Multisizer II)

Potentiometric titration workstation (Radiometer pH meter PHM 290 with automatic burrette ABU 901)

Ion chromatography devices IC100 i IC1100 (Dionex)

Iva Buljan
dr.sc.

Senior Research Assistant
+385 1 457 1209

Jasminka Kontrec
dr. sc.

research associate
+385 1 456 1004

Damir Kralj
dr. sc.

senior scientist
+385 1 468 0207

Branka Njegić Džakula
PhD

research associate
+385 1 457 1343

Marko Ukrainczyk
Dr. sc.

Senior research assistant

Effect of natural acidic macromolecules on calcium carbonate precipitation

Principal Investigator: Branka Njegić Džakula

The study of the influence of natural acidic macromolecules, extracted from the skeleton of sea corals, on precipitation of CaCO3 polymorphs, calcite and aragonite.

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Interactions of organic additives with calcite crystals of different morphologies

Principal Investigator: Marko Ukrainczyk

The objective of the project is to study the interactions of organic additives, particularly phosphonates and

carboxylates, with calcite crystals of different morphologies.

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Preparation of perticipated calcium carbonate in semi continous process

Preparation of perticipated calcium carbonate in semi continous process

Institute Rudjer Boskovic expert team offers innovative service and expertise in controlled preparation of participated calcium carbonate with specific physical-chemical characteristics with semi continuous or batch process. Preparation process is done within multifunctional computer-controlled bench scale chemical reactor developed by scientists. Expert team also offers their services in developing products for basic chemical and pharmaceutical industry that are prepared through processes of crystallisation or participation.

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Viker

Viker Multifunctional pc-controlled bench scale chemical reactor

Viker is a multifunctionalcomputer-controlled bench scale chemical reactor developed by scientists from Rudjer Boskovic Institute. It has the possibility of controlling a number of technological parameters with PID regulation implemented.

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