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Lamovec, Jelena

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  • Lamovec, Jelena (3)
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Author's Bibliography

Preparation of NdFeB Magnetic Nanoparticles by Surfactant-Assisted High Energy Ball Milling

Lamovec, Jelena; Jović, Vesna; Radovanović, Filip; Ranđelović, Danijela; Radulović, Katarina; Jakšić, Zoran; Vasiljević Radović, Dana

(Belgrade : Materials Research Society of Serbia, 2015)

TY  - CONF
AU  - Lamovec, Jelena
AU  - Jović, Vesna
AU  - Radovanović, Filip
AU  - Ranđelović, Danijela
AU  - Radulović, Katarina
AU  - Jakšić, Zoran
AU  - Vasiljević Radović, Dana
PY  - 2015
UR  - http://dais.sanu.ac.rs/123456789/804
AB  - Improved permanent magnets are essential for emergent applications in electronic and electric devices. Different attempts have been made to produce nanoscale anisotropic rare-earth magnetic powder based on Nd-Fe-B material. Recently, high energy surfactant assisted ball milling has been proven to be an effective technique to produce anisotropic hard magnetic Nd-Fe-B nanoparticles. In this paper we are presenting our experimental results on high energy ball milling in planetary mill "Puverisette 7 premium line" from "Fritsch". Except milling material, there are several variables which influence the milling process for the selected mill type. They are: mechanical properties of the milling media material (bowls, balls, etc.), ball-to-powder ratio (BPR), extent of filling of the milling bowl, milling atmosphere, milling speed and duration, and type of solution and surfactant for wet milling. We are going to give influence of all these parameters on obtained NdFeB magnetic materials with nanosized dimensions starting from Nd2Fe14B HDD (Hydrogenated Disproportionated Desorbed) material. 

Acknowledgements: This work is funded by FP7 project MAG-DRIVE: "New permanent magnets for electric-vehicle drive applications", grant agreement no: 605348.
PB  - Belgrade : Materials Research Society of Serbia
C3  - Seventeenth Annual Conference YUCOMAT 2015, Aug 31-Sep 04, 2015, Herceg Novi, Montenegro, Programme and the Book of Abstracts
T1  - Preparation of NdFeB Magnetic Nanoparticles by Surfactant-Assisted High Energy Ball Milling
SP  - 66
EP  - 66
ER  - 
@conference{
author = "Lamovec, Jelena and Jović, Vesna and Radovanović, Filip and Ranđelović, Danijela and Radulović, Katarina and Jakšić, Zoran and Vasiljević Radović, Dana",
year = "2015",
url = "http://dais.sanu.ac.rs/123456789/804",
abstract = "Improved permanent magnets are essential for emergent applications in electronic and electric devices. Different attempts have been made to produce nanoscale anisotropic rare-earth magnetic powder based on Nd-Fe-B material. Recently, high energy surfactant assisted ball milling has been proven to be an effective technique to produce anisotropic hard magnetic Nd-Fe-B nanoparticles. In this paper we are presenting our experimental results on high energy ball milling in planetary mill "Puverisette 7 premium line" from "Fritsch". Except milling material, there are several variables which influence the milling process for the selected mill type. They are: mechanical properties of the milling media material (bowls, balls, etc.), ball-to-powder ratio (BPR), extent of filling of the milling bowl, milling atmosphere, milling speed and duration, and type of solution and surfactant for wet milling. We are going to give influence of all these parameters on obtained NdFeB magnetic materials with nanosized dimensions starting from Nd2Fe14B HDD (Hydrogenated Disproportionated Desorbed) material. 

Acknowledgements: This work is funded by FP7 project MAG-DRIVE: "New permanent magnets for electric-vehicle drive applications", grant agreement no: 605348.",
publisher = "Belgrade : Materials Research Society of Serbia",
journal = "Seventeenth Annual Conference YUCOMAT 2015, Aug 31-Sep 04, 2015, Herceg Novi, Montenegro, Programme and the Book of Abstracts",
title = "Preparation of NdFeB Magnetic Nanoparticles by Surfactant-Assisted High Energy Ball Milling",
pages = "66-66"
}
Lamovec, J., Jović, V., Radovanović, F., Ranđelović, D., Radulović, K., Jakšić, Z.,& Vasiljević Radović, D. (2015). Preparation of NdFeB Magnetic Nanoparticles by Surfactant-Assisted High Energy Ball Milling.
Seventeenth Annual Conference YUCOMAT 2015, Aug 31-Sep 04, 2015, Herceg Novi, Montenegro, Programme and the Book of AbstractsBelgrade : Materials Research Society of Serbia., null, 66-66. 
Lamovec J, Jović V, Radovanović F, Ranđelović D, Radulović K, Jakšić Z, Vasiljević Radović D. Preparation of NdFeB Magnetic Nanoparticles by Surfactant-Assisted High Energy Ball Milling. Seventeenth Annual Conference YUCOMAT 2015, Aug 31-Sep 04, 2015, Herceg Novi, Montenegro, Programme and the Book of Abstracts. 2015;:66-66

Modelling the size separation of NdFeB magnetic microparticles by magnetophoresis and gravity settling

Radulović, Katarina; Radovanović, Filip; Ranđelović, Danijela; Jović, Vesna; Lamovec, Jelena; Vasiljević Radović, Dana; Jakšić, Zoran

(Belgrade : ETRAN Society, 2015)

TY  - CONF
AU  - Radulović, Katarina
AU  - Radovanović, Filip
AU  - Ranđelović, Danijela
AU  - Jović, Vesna
AU  - Lamovec, Jelena
AU  - Vasiljević Radović, Dana
AU  - Jakšić, Zoran
PY  - 2015
UR  - http://dais.sanu.ac.rs/123456789/787
AB  - Properties of sintered NdFeB magnets strongly depend on granulation and size distribution of constituent particles, which requires an efficient method for their separation into relatively narrow size fractions. We investigated two methods of magnetic particle separation from a mixture with different sizes using simulation by finite element method: magnetophoresis and gravity settling. In the case of magnetophoresis magnetic particles ranging in diameter from 1 to 10 m were deflected from the direction of continuous laminar flow by a perpendicular magnetic field. Larger particles were deflected from the direction of laminar flow more than smaller particles. The applied flow rate and strength and gradient of the applied magnetic field were the key parameters in controlling the deflection. The gravity settling model simulated spherical particles falling in heptane. Particles of various sizes were divided according to the time they needed to reach the bottom. The model used an axially symmetric fluid-flow simulation in a moving coordinate system connected with the particle, coupled with an ordinary differential equation for the force balance of the particle (gravity and drag force). The grain accelerated from standstill and rapidly reached its terminal velocity. This velocity was approximately proportional to the square of the particle radius, which led to clear separation of 5-10 um particles from those with a diameter of 1 um.
PB  - Belgrade : ETRAN Society
C3  - 59. Konferencija za elektroniku, telekomunikacije, računarstvo, automatiku i nuklearnu tehniku, Srebrno jezero, 8-11. juna, 2015. godine [i] 2nd International Conference on Electrical, Electronic and Computing Engineering IcETRAN 2015 Silver Lake (Srebrno jezero), Serbia, June 8-11, 2015: Proceedings
T1  - Modelling the size separation of NdFeB magnetic microparticles by magnetophoresis and gravity settling
ER  - 
@conference{
author = "Radulović, Katarina and Radovanović, Filip and Ranđelović, Danijela and Jović, Vesna and Lamovec, Jelena and Vasiljević Radović, Dana and Jakšić, Zoran",
year = "2015",
url = "http://dais.sanu.ac.rs/123456789/787",
abstract = "Properties of sintered NdFeB magnets strongly depend on granulation and size distribution of constituent particles, which requires an efficient method for their separation into relatively narrow size fractions. We investigated two methods of magnetic particle separation from a mixture with different sizes using simulation by finite element method: magnetophoresis and gravity settling. In the case of magnetophoresis magnetic particles ranging in diameter from 1 to 10 m were deflected from the direction of continuous laminar flow by a perpendicular magnetic field. Larger particles were deflected from the direction of laminar flow more than smaller particles. The applied flow rate and strength and gradient of the applied magnetic field were the key parameters in controlling the deflection. The gravity settling model simulated spherical particles falling in heptane. Particles of various sizes were divided according to the time they needed to reach the bottom. The model used an axially symmetric fluid-flow simulation in a moving coordinate system connected with the particle, coupled with an ordinary differential equation for the force balance of the particle (gravity and drag force). The grain accelerated from standstill and rapidly reached its terminal velocity. This velocity was approximately proportional to the square of the particle radius, which led to clear separation of 5-10 um particles from those with a diameter of 1 um.",
publisher = "Belgrade : ETRAN Society",
journal = "59. Konferencija za elektroniku, telekomunikacije, računarstvo, automatiku i nuklearnu tehniku, Srebrno jezero, 8-11. juna, 2015. godine [i] 2nd International Conference on Electrical, Electronic and Computing Engineering IcETRAN 2015 Silver Lake (Srebrno jezero), Serbia, June 8-11, 2015: Proceedings",
title = "Modelling the size separation of NdFeB magnetic microparticles by magnetophoresis and gravity settling"
}
Radulović, K., Radovanović, F., Ranđelović, D., Jović, V., Lamovec, J., Vasiljević Radović, D.,& Jakšić, Z. (2015). Modelling the size separation of NdFeB magnetic microparticles by magnetophoresis and gravity settling.
59. Konferencija za elektroniku, telekomunikacije, računarstvo, automatiku i nuklearnu tehniku, Srebrno jezero, 8-11. juna, 2015. godine [i] 2nd International Conference on Electrical, Electronic and Computing Engineering IcETRAN 2015 Silver Lake (Srebrno jezero), Serbia, June 8-11, 2015: ProceedingsBelgrade : ETRAN Society., null. 
Radulović K, Radovanović F, Ranđelović D, Jović V, Lamovec J, Vasiljević Radović D, Jakšić Z. Modelling the size separation of NdFeB magnetic microparticles by magnetophoresis and gravity settling. 59. Konferencija za elektroniku, telekomunikacije, računarstvo, automatiku i nuklearnu tehniku, Srebrno jezero, 8-11. juna, 2015. godine [i] 2nd International Conference on Electrical, Electronic and Computing Engineering IcETRAN 2015 Silver Lake (Srebrno jezero), Serbia, June 8-11, 2015: Proceedings. 2015;

Characterization of PDMS membranes fabricated by bulkmicromachining on silicon wafers

Jović, Vesna; Đinović, Zoran; Radovanović, Filip; Starčević, Marko; Lamovec, Jelena; Smiljanić, Milče; Lazić, Žarko

(Belgrade : Military Technical Institute, 2014)

TY  - CONF
AU  - Jović, Vesna
AU  - Đinović, Zoran
AU  - Radovanović, Filip
AU  - Starčević, Marko
AU  - Lamovec, Jelena
AU  - Smiljanić, Milče
AU  - Lazić, Žarko
PY  - 2014
UR  - http://dais.sanu.ac.rs/123456789/785
AB  - In this paper we proposed microfabrication scheme for PDMS (Polydimethylsiloxane) thin membrane fabrication on Si micromachined cavities with square cross section. PDMS network samples for this research were synthesized with the same composition, which are Sylgard 184 (Dow Corning, USA) silicone elastomer base and silicone elastomer curing agent, volume ratio 10:1. Mechanical testing of PDMS elastic properties and bond strength between membranes and oxidized Si wafers, were investigated applying pressurized bulge testing In this paper experimentally determined dependence of the PDMS membrane deflection on pressure load for different membrane thicknesses and sizes of square cavities in Si wafers are given. Also, the influence of different types of Si wafer structuring by anisotropic wet chemical etching on membrane bonding strength were considered.
PB  - Belgrade : Military Technical Institute
C3  - 6th International Scientific Conference on Defensive Technologies, OTEH 2014, Belgrade, 09-10 October 2014: Proceedings
T1  - Characterization of PDMS membranes fabricated by bulkmicromachining on silicon wafers
SP  - 674
EP  - 679
ER  - 
@conference{
author = "Jović, Vesna and Đinović, Zoran and Radovanović, Filip and Starčević, Marko and Lamovec, Jelena and Smiljanić, Milče and Lazić, Žarko",
year = "2014",
url = "http://dais.sanu.ac.rs/123456789/785",
abstract = "In this paper we proposed microfabrication scheme for PDMS (Polydimethylsiloxane) thin membrane fabrication on Si micromachined cavities with square cross section. PDMS network samples for this research were synthesized with the same composition, which are Sylgard 184 (Dow Corning, USA) silicone elastomer base and silicone elastomer curing agent, volume ratio 10:1. Mechanical testing of PDMS elastic properties and bond strength between membranes and oxidized Si wafers, were investigated applying pressurized bulge testing In this paper experimentally determined dependence of the PDMS membrane deflection on pressure load for different membrane thicknesses and sizes of square cavities in Si wafers are given. Also, the influence of different types of Si wafer structuring by anisotropic wet chemical etching on membrane bonding strength were considered.",
publisher = "Belgrade : Military Technical Institute",
journal = "6th International Scientific Conference on Defensive Technologies, OTEH 2014, Belgrade, 09-10 October 2014: Proceedings",
title = "Characterization of PDMS membranes fabricated by bulkmicromachining on silicon wafers",
pages = "674-679"
}
Jović, V., Đinović, Z., Radovanović, F., Starčević, M., Lamovec, J., Smiljanić, M.,& Lazić, Ž. (2014). Characterization of PDMS membranes fabricated by bulkmicromachining on silicon wafers.
6th International Scientific Conference on Defensive Technologies, OTEH 2014, Belgrade, 09-10 October 2014: ProceedingsBelgrade : Military Technical Institute., null, 674-679. 
Jović V, Đinović Z, Radovanović F, Starčević M, Lamovec J, Smiljanić M, Lazić Ž. Characterization of PDMS membranes fabricated by bulkmicromachining on silicon wafers. 6th International Scientific Conference on Defensive Technologies, OTEH 2014, Belgrade, 09-10 October 2014: Proceedings. 2014;:674-679