University of Petrosani - Romania
applications
Nano-liquids preparation,
characterization and processing
Magnetic nano-particles dispersions in liquids, forming the so called "Nano-liquids", or "Ferrofluids", or "Magnetic fluids", were prepared, characterized and processed using physical methods, during the past decades, in our department.
Characterization refers to the determination of nano-liquid density, magnetization curve, initial magnetic susceptibility, saturation magnetization, dynamic viscosity curve, initial dynamic viscosity coefficient, saturation viscosity coefficient - the main characteristics of this kind of liquid. A special magnetometer (based on Gouy's method), a capillary and a vibration viscometer, were design and made , and a MathCAD software were written for experimental data processing.
For the nano-particles themselves, the saturation magnetization, their distribution functions by physical, magnetic and hydrodynamic dimensions are determined, using the previously presented methods and software.
Because all these characteristics differ according to the asked application or study, several physical methods were used in order to controll them, to obtain the desired characteristics: nano-particles diffusion in the basic liquid, forced evaporation, ultracentrifugation and high gradient magnetic separation.
As a result, special nano-liquids were obtained: with high saturation magnetization, with high ratio of the magnetic phase, with high or low viscosity, cvasi-monodisperse, with a given distribution function of the particles, etc.
Theoretical bases and experimental results were obtained for each measuring device, method and type of nano-liquid.
For the time being, two national research consortia were established, related to this project, in which we are a part:
1. SPIN DYNAMICS IN NANO- MICRO-STRUCTURED MAGNETIC SYSTEMS
- Project coordinator: WEST UNIVERSITY OF TIMISOARA, Timisoara, RO (Dr. Iosif MALAESCU - Project Director)
- Partner: NATIONAL R&D INSTITUTE FOR ISOTOPIC AND MOLECULAR TECHNOLOGIES, Cluj-Napoca, RO (Dr. Liviu GIURGIU)
- Partner: UNIVERSITY OF PETROSANI, Petrosani, RO (Dr. Constantin Dan BUIOCA)
- Partner: NATIONAL R&D INSTITUTE FOR ELECTROCHEMISTRY AND CONDENSED MATTER, Timisoara, RO (Dr. Ioan GROZESCU)
- Partner: BABES-BOLYAI UNIVERSITY OF CLUJ-NAPOCA, Cluj-Napoca, RO (Dr. Viorel POP)
- Partner: WEST UNIVERSITY OF TIMISOARA, RESEARCH CENTER FOR SMART MATERIALS, Timisoara, RO (Dr. Ioan BICA).
2. RESEARCHES REGARDING IRRADIATION EFFECTS ON THE PROPERTIES OF MAGNETIZABLE COMPLEXE LIQUIDS
- Project coordinator: WEST UNIVERSITY OF TIMISOARA, Timisoara, RO (Dr. Catalin MARIN - Project Director)
- Partner: NATIONAL R&D INSTITUTE FOR ISOTOPIC AND MOLECULAR TECHNOLOGIES, Cluj-Napoca, RO (Dr. Liviu GIURGIU)
- Partner: UNIVERSITY OF PETROSANI, Petrosani, RO (Dr. Constantin Dan BUIOCA)
- Partner: NATIONAL R&D INSTITUTE FOR ELECTROCHEMISTRY AND CONDENSED MATTER, Timisoara, RO (Dr. Ioan GROZESCU)
- Partner: NATIONAL R&D INSTITUTE FOR LASER, PLASMA AND RADIATION PHYSICS, Bucharest, RO (Dr. Constantin OPROIU)
- Partner: WEST UNIVERSITY OF TIMISOARA, FACULTY OF MECHANICS, Timisoara, RO (Dr. Liviu BERETEU).