Prez_Malaescu_NANOPROSPECT.pdf

7/26/2019 Prez_Malaescu_NANOPROSPECT.pdf

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PProprietroprieti electricei electrice i magneticei magnetice

ale sistemelor de nanoparticuleale sistemelor de nanoparticulenn

cmp decmp denaltfrecvennaltfrecven

I. Mlescu, C. N. Marin

Universitatea de Vest din Timioara, Facultatea de Fizic, Bd. V. Prvan no. 4,300223 Timioara, Romania


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UniversitateaUniversitatea de Vest dinde Vest din TimiTimioaraoara

FacultateaFacultatea dede FizicFizic

Blvd. V. Prvan 4Timioara 300223, Timi, Romania

Tel/fax +40-(0)256-592108Email: [email protected]


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Centre deCentre de cercetarecercetare

1. Fizica materialelor cristaline (acreditat CNCSIS) Tip B

2. Centru de cercetri n Fizica Teoretic (acreditat CNCSIS)

3. Centru de cercetare pentru materialeinteligente (acreditat CNCSIS)

4. Centrul National de Difractometrie cu Raze X-Laboratorul pentruDeterminari Cristalografice

5. Grupul de electronic cuantic

6. Platforma solar

7. Grupul de relativitate numeric

Facultatea de Fizica are o baza de cercetare foarte

solid format din 3 centre de cercetare:


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Director: Prof. Dr.Prof. Dr. IoanIoan BicaBicaDirector adj.: Prof. Dr.Prof. Dr. IosifIosifMMllescuescuMembri:

Prof. dr. Agneta BalintConf. dr. Ctlin Nicolae Marin

Conf. dr. Aurel Ercuta

Conf. dr. Dorina Vangheli

Conf. dr. Costica Caizer

Lector dr. Adrian Neculae

Lector Nicoletatefu

Drd. Radu Totoreanu

Drd. Cecilia Obead

Drd. Alexandru Savici

Secretar Diana Algayer

CentrulCentruldede cercetarecercetarepentrupentru

MMaterialeaterialeIInteligententeligente

DirecDireciiii dede cecetarececetare:: Obinerea caracterizareai aplicaiile fluidelor

magnetoreologice(Prof. dr. Ioan Bica)

Procesarea materialelor n plasm(Prof. dr. Ioan Bica)

Nanosisteme de particule n cmp electromagnetici aplicaii

(Prof. dr. I. Mlescu ) Modelarea i simularea proceselor fizice n sisteme

nano-microstructurate(Lector. dr. A. Neculae) Cercetarea sistemelor de tip spinel-magnetice,

nanocristaline obinute din combinaii complexehetero-nucleare i metoda sol-gel

(Conf. dr. C. Caizer)


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Obinerea, caracterizareai aplicaiilefluidelor magnetoreologice

Procesarea materialelor n plasm(Prof. dr. Ioan Bica)

Rezultate:

30 articole de specialitate cotate ISI n ultimii 5 ani 4 contracte de cercetare internationale cu Dubna 1 Premiu al Academiei (2009)

colaborare internaionala cu Inha University din Coreea de Sud, prof. Choi,n domeniul,- realizrii de nano-microsisteme sub formde elastomerimagneto-reologici i suspensii magnetoreologice.


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Nanosisteme de particule n cmp

electromagnetic i aplicaii

Colectiv de cercetare:

Prof. Dr.Prof. Dr. IosifIosifMMllescuescuConf. dr. Ctlin Nicolae MarinConf. dr. Aurel ErcutaLector Nicoletatefu

Doctoranzi:Drd. Radu Totoreanu

Drd. Cecilia ObeadDrd. Alexandru Savici

Studeni master:Dan MlescuPetronela Burov

Cosmina Stan

ObiectiveObiective::

Studiul rezonanei feromagnetice i a proceselorde relaxare n fluide magnetice; Investigarea unor proprieti microscopice i

macroscopice ale fluidelor magnetice utilizndmsurtorile de rezonanferomagnetic;

Studiul puterii specifice in nanofluide indomeniul microundelor;

Fenomene de propagare a cmpuluielectromagnetic in domeniul microundelor;aplicaii.

Obinerea i caracterizarea de compozite

magneto-dielectrice nanostructurate cu indice derefracie negativ; Obinerea de anvelope inteligente cu absorbie

pronunatn domeniul microundelor pentruprotecia mpotriva polurii electromagnetice

Obinerea

i caracterizarea coloizilor magneto-

electrici pentru aplicaii biomedicale.


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Analizor de reea tip N9923A Agilent,2 MHz - 4 GHz

Analizor de spectru, tip HM 5510 Hameg,150 kHz - 1 GHz

RLC metru tip E4980A Agilent, 20 Hz - 2 MHz

UTILITI

Histeresisgraf, 50Hz, 0.5TGeneratoare de microundeLinii de msurcu ghid de undCelule de msurpentru msurareaparametrilor dielectrici i magnetici ndomeniul 20 Hz 4 GHz


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LISTA LUCRRILOR TIINIFICE(2006-2011)

1. Articole publicate n reviste de specialitate cotate ISI

1) P. C. Fannin, C. N. Marin, I. Malaescu, N. Stefu, P. Vlzan, S. Novaconi, S. Popescu, Effect of theconcentration of precursors on the microwave absorbent properties of Zn/Fe oxide nanopowders, J.Nanopart. Res. 13 (2011) 311319

2) P.C. Fannin, C.N. Marin, I. Malaescu, N. Stefu, P. Vlazan, S. Novaconi, P. Sfirloaga, S. Popescu, C.

Couper, Microwave absorbent properties of nanosized cobalt ferrite powders prepared bycoprecipitation and subjected to different thermal treatments, Materials and Design 32 (2011) 16001604

3) P. C.Fannin, I.Malaescu, C. N.Marin, N, Stefu, Microwave propagation parameters in magneticfluids, Eur. Phys. J. E 29, 299303 (2009)

4) P. C.Fannin, I.Malaescu, C. N.Marin, N, Stefu, Microwave specific loss power of magnetic fluidssubjected to a static magnetic field, Eur. Phys. J. E 27, 145148 (2008)

5) P. C.Fannin, C. N.Marin, I.Malaescu, N, Stefu,An investigation of the microscopic and macroscopicproperties of magnetic fluids, Physica B: Condensed Matter388 (1-2), pp. 87-92, (2007)

6) P. C.Fannin, I. Malaescu, C. N.Marin, Determination of the Landau-Lifshitz damping parameter ofcomposite magnetic fluids, Physica B: Condensed Matter388 (1-2), pp. 93-98, (2007)

7) P. C. Fannin, C. N. Marin, I. Malaescu, N. Stefu, Microwave dielectric properties of magnetitecolloidal particles in magnetic fluids, J. Phys.: Condensed Matter, 19 (2007) 036104-036111.

8) P.C.Fannin, C.Mac Oireachtaigh, I. Malaescu, C.N.Marin, Investigation of magnetic fluids exhibitingfield induced absorption peaks in the susceptibility spectra, Journal of Optoelectronics andAdvanced Materials 8 (1), pp. 46-49, (2006)


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2. Articole indexate in baze de date internationale

1) P. C.Fannin, I.Malaescu, N, Stefu, C. N.Marin, Polarizing field and particle concentration dependence of themagnetic loss power in ferrofluids, TIM-08, 28-29 November 2008, Timisoara, Romania, AIP ConferenceProceedings 1131, Melville New York (2009) 81-85, Editors M. Bunoiu, I. Malaescu

2) P. C.Fannin, N, Stefu, C. N.Marin, I.Malaescu, R. Totoreanu, Ferrofluid microwave devices with magneticallycontrolled impedances, TIM-09, 27-28 November 2009, Timisoara, Romania, AIP Conference Proceedings 1262,Melville New York (2010) 92-97, Editors M. Bunoiu, I. Malaescu

3) V. A.Serban, I.Malaescu, A. Ercuta, C. N.Marin, N, Stefu, C. Opris, C. Codrean, D. Utu, Magnetic properties of theWC-Co cermet powders, TIM-09, 27-28 November 2009, Timisoara, Romania, AIP Conference Proceedings 1262,Melville New York (2010) 113-117, Editors M. Bunoiu, I. Malaescu

3. Lucrari stiintifice comunicate

a) la conferine internaionale1) I. Malaescu , C. N. Marin, P. C. Fannin, Investigation of the dynamic properties of magnetic fluids using theferromagnetic resonance, 7th International Balkan Workshop on Applied Physics, July 5-7, 2006, Constanta, Romania(Invited lecture)2) P. C. Fannin, C. N. Marin, C. Couper, I. Malaescu, N. Stefu, A Comparative Study of the Field Dependence of the

Properties of Colloidal Suspensions of Nanoparticles and of Magnetic Microspheres, PIERS Proceedings, Xi'an,

China, March 22-26, 2010

b) la conferine naionale

1). P.C.Fannin, I. Malaescu, C.N.Marin, N. Stefu, Power dissipation in magnetic fluids in microwave range, PhysicsConference Tim-06, Timisoara, November 24th- 25th, 2006.

2). P.C.Fannin, I. Malaescu, N. Stefu, C.N.Marin, Dependence on the frequency and magnetic polarizing field of thecomplex dielectric permittivity of the magnetic fluids in microwave range, Physics Conference Tim-06, Timisoara,November 24th- 25th, 2006.


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3) P.C.Fannin, C.N.Marin, I. Malaescu, N. Stefu, The effect of the polarizing magnetic field and of thepartial immobilization of particles on the loss power in magnetic fluids, Physics Conference Tim-06,Timisoara, November 24th- 25th, 2006.

4) I. Malaescu, P.C.Fannin, C.N.Marin, N.Stefu, Magnetic and dielectric behaviour of magnetic fluids inelectromagnetic field, National Conference on Applied Physics, December 8-9 2006, Iasi, Romania(Invited lecture)

5) I.Malaescu, P.C.Fannin, C.N.Marin, N.Stefu,A study of magnetic fluid hyperthermia with application

to the cancer treatment, National Conference on Applied Physics, December 8-9 2006, Iasi, Romania

6) P.C. Fannin, I. Malaescu, C.N.Marin, N. Stefu, Specific loss in magnetic fluids in microwave range,Physics Conference Tim-07, Timisoara, November 23th- 24th, 2007.

7) P.C. Fannin, I. Malaescu, C.N.Marin, N. Stefu, Frequency and field dependence of the

electromagnetic field propagation constant in magnetic fluids in microwave range, PhysicsConference Tim-07, Timisoara, November 23th- 24th, 2007.

8) P.C. Fannin, I. Malaescu, C.N.Marin, The spectroscopic splitting factor of nanoparticles in magneticfluids, Physics Conference Tim-07, Timisoara, November 23th- 24th, 2007.

4. Cri publicate n edituri recunoscute (cu ISSN sau ISBN):

1) I. Mlescu, Ferofluide n cmp de radiofrecven, Editura Mirton, Timioara, 1998, ISBN:973-578-499-8.

2) I. Mlescu, Materiale i dispozitive electronice n cmp de naltfrecven, EdituraEurobit, Timioara, 2008, ISBN: 978-973-620-391-6


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Proiecte de cercetare pe baza de contract/grant

2008-2011

(in derulare )

Responsabil de

Proiect

(UVT)

Catalin Marin

Programul 4 Parteneriate in domeniile prioritare, tip PC 3516, Acronim AAEM, cu

tema: DEZVOLTAREA DE COMPOSITE MAGNETODIELECTRICE

NANOSTRUCTURATE PENTRU CREAREA DE ANVELOPE INTELIGENTE CU

ABSORBTIE PRONUNTATA A MICROUNDELOR

Coordonator: Institutul National de Cercetare Dezvoltare pentru Electrochimie siMaterie Condensata Timisoara, Director proiect, CP2 fiz. St. Novaconi

2008-2011

(in derulare )

Responsabil de

Proiect(UVT)

Iosif Malaescu

Programul 4 Parteneriate in domeniile prioritare, tip PC 3456, Acronim SENBITE,

cu tema: SINTEZA DE SEMICONDUCTORI NANOSTRUCTURATI PE BAZA DEBi2Te3 SI Zn4Sb3DOPATI CU APLICATII IN ENERGETICA CURATA

Coordonator: Institutul National de Cercetare Dezvoltare pentru Electrochimie si

Materie Condensata Timisoara, Director proiect, CP2 fiz. St. Novaconi

2006-2010Responsabil

stiintific

din partea UVT

Iosif Malaescu

Colaborare internationala cu prof. P.C. Fannin, de la Trinity College, Dublin, Irlanda,

in cadrul proiectului comun de cercetare cu tema:

THE INVESTIGATION, MEASUREMENT ANALYSIS AND APPLICATIONS OF

NANO-MICROPARTICLE SYSTEMS

Department of Electrical Engineering, Trinity College, Dublin 2, Ireland, Director

Prof. Dr. P. C. Fannin

2007-2010Responsabil de

Proiect

(UVT)

Iosif Malaescu

- Programul 4 Parteneriate in domeniile prioritare (PC), din programul PN2 cu

tema TEHNOLOGII INOVATIVE DE OBTINERE PRIN PULVERIZARE TERMICA

A MICROSTRATURILOR COMPOZITE DE TIP CERMET ANTICOROZIVE SI

ANTIUZARE, PC 2179

Universitatea POLITEHNICA Timisoara (UPT), Dir. Prof. Dr. Ing. Viorel-Aurel

Serban

2005-2008Responsabil de

Proiect(UVT)

Aurel Ercuta

Subontract CEEX, tip:P-CD, NANO4M nr.561/2005, cu tema:NANOCONTROL SI

MULTIFUNCTIONALITATE IN MATERIALE, MICROSTRATURI SIARHITECTURI CU MEMORIE A FORMEI director de proiect lector dr. Aurel

Ercuta, Universitatea de Vest din Timisoara

2006-2008Responsabil deProiect

(UVT)

Ioan Bica

- Grant de cercetare CERCETARE DE EXCELENTA (CEEX) 2006, cu tema:DEZVOLTAREA CUNOASTERII ASUPRA ELABORARII SI MICROPROCESARII

PRIN METALURGIA PULBERILOR A MATERIALELOR NANOSTRUCTURATE

PENTRU COMPONENTE MEMS, acronim : PRONANOMAT ,

beneficiar : MATNANTECH ; coordonator: Universitatea din Craiova, Faculaltea

de Ingineria si Managementul Sistemelor Tehnologice din Drobeta Turnu Severin ;

director proiect : prof.dr.ing. Mangra Mihail ; durata finantarii: 2006 - 2008

PerioadaFunciaProgramul/Proiectul


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Activitatea de cercetareActivitatea de cercetare

din ultimii cinci anidin ultimii cinci ani

Cercetare fundamentalRezonana feromagnetic

Procese de relaxare(dielectrici magnetic)

Cercetare aplicativParametrii de propagare n

fluide magnetice i feriteAbsorbani electromagnetici


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Principalele rezultate

1.1. RezonantaRezonanta feromagneticaferomagnetica

FenomenulFenomenul dede rezonantarezonanta feromagneticaferomagnetica inin fluidelefluidele magneticemagnetice,, utilizandutilizand masuratorilemasuratorile dedepermeabilitatepermeabilitate magneticamagneticacomplexacomplexa, a, a fostfost evidenevideniat iniiat iniialial dede catrecatre FanninFannin.. ExistentaExistenta fenomenuluifenomenului dede rezonantarezonanta feromagneticaferomagnetica esteeste indicataindicataprinprin

tranzitiatranzitia de la ode la o valoarevaloare supaunitarasupaunitara la ola o valoarevaloare subunitarasubunitara aapartiipartii realereale aapermeabilitatiipermeabilitatii magneticemagnetice complexecomplexe,, ((),), lala

frecventafrecventa dede rezonantarezonanta ffresres..

0,5 1 5 60,0

0,5

1,0

1,5MF1 - magnetite particles in kerosene

fmax=5.45 GHz

fmax=1.22 GHz fres=5.46 GHz

fres=1.81 GHz

10987654

32

1

''

f [GHz]

'''

'

109876543

21

0,5 1 5 60,0

0,2

0,8

1,0

1,21,4 MF2 - Mn0.6Fe0.4Fe2O3particles in kerosene

fmax=5.11 GHzfmax=0.91 GHz

fres=5.12 GHzfres=1.31 GHz

98765

43

2

72

34 5 6 98'

f [GHz]

'''

''1

10

1

10

Fig. 1. The plots of the complex permeability of sample MF1 (a) and MF2 (b) as a function of frequency and polarizing field

(the polarizing field strengths are approximately: (1) 0 kA/m,(2) 15.23 kA/m, (3) 24.47 kA/m, (4) 35.28 kA/m, (5) 46.18

kA/m, (6) 57.07 kA/m, (7) 68.49 kA/m,(8) 79.33 kA/m, (9) 90.66 kA/m, (10) 102.40 kA/m. [6]

[6] P. C.Fannin, I. Malaescu, C. N.Marin,Determination of the Landau-Lifshitz damping parameter ofcomposite magnetic fluids, Physica B: Condensed Matter388 (1-2), pp. 93-98, (2007)


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IntrIntr--un camp deun camp de polarizarepolarizare puternicputernic parametrulparametrul dede atenuareatenuare, din, din ecuatiaecuatia LandauLandau--LifshitzLifshitz satisfacesatisface conditiaconditia (17) [6](17) [6]

InIn EqEq (1),(1), fmaxfmax reprezintareprezinta frecventafrecventa corespunzatoarecorespunzatoare

maximuluimaximului dependenteidependentei dede frecventafrecventa aa componenteicomponentei imaginareimaginare,,

(())..

( )( )

( )17/1/1

2

max

2

max

res

res

ffff

+

=

0 20 40 60 80 100 1200.6

0.7

0.8

0.9

1.0

HA= 48.14 kA/m

MF1 - magnetite in kerosenefmax

/fres

H [kA/m]

0 20 40 60 80 100 1200.6

0.7

0.8

0.9

1.0

HA

=30.44 kA/m

MF2 - Mn0.6

Fe0.4

Fe2O

4particles

in kerosenefmax

/fres

H [kA/m]

( ) )18(13.01 =MF ( )2 0.127 (19)MF =


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CunoastereaCunoasterea parametruluiparametrului dede atenuareatenuare, din, din ecuatiaecuatia LandauLandau--LifshitzLifshitz esteeste importantaimportanta pentrupentru mediimedii dedenregistrare magneticnregistrare magnetic..

PePe bazabaza msurtorilor de rezonanmsurtorilor de rezonanferomagneticferomagnetic, se pot determina o serie, se pot determina o seriedede parametri macroscopiciparametri macroscopici i microscopicii microscopici aaii fluidelor magneticefluidelor magneticeinvestigate, ainvestigate, aa cum am artata cum am artatn lucrarean lucrarea [5][5] ii cum secum se observobservn tabelul 1.n tabelul 1.

[5] P. C.Fannin, C. N.Marin, I.Malaescu, N, Stefu,An investigation of the microscopic and macroscopic

properties of magnetic fluids, Physica B: Condensed Matter388 (1-2), pp. 87-92, (2007)

uundende S1, S2S1, S2 i S3 sunt fluide magnetice comerciale de tip Isopar M, cui S3 sunt fluide magnetice comerciale de tip Isopar M, cuparticule coloidale de magnetitparticule coloidale de magnetit(S1); de tip Ni(S1); de tip Ni0.50.5ZnZn0.50.5FeFe22OO44 (S2); si de tip(S2); si de tipMnMn

0.660.66ZnZn

0.330.33FeFe

22OO

44(S3).(S3).


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0,1 1 40,00

0,05

0,10

0,15

0,20MF1 - magnetite particles in kerosene

FIT

EXPERIMENTAL

''

f [GHz]0,1

1

2

3

4MF1 - magnetite in kerosene

F IT

E XPERIMENTAL

'

f [GHz]1 4

2.2. Comportarea dielectricComportarea dielectricn domeniul microundelorn domeniul microundelor [7][7]

Figure 2. Dependena de frecvena prii reale () i imaginare () a permitivitii dielectrice complexe a probeia) b)

[7] P. C. Fannin, C. N. Marin, I. Malaescu, N. Stefu,Microwave dielectric properties of magnetite colloidalparticles in magnetic fluids, J. Phys.: Condensed Matter, 19 (2007) 036104-036111.


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Utiliznd teoria lui Sillars pentru dielectrici heterogeni (R. W.R. W. SillarsSillars,, Journal ofJournal of

Institution of Electrical EngineersInstitution of Electrical Engineers, 80 (1937) 378, 80 (1937) 378--394394), n aproximaia bifazic,permitivitatea dielectriccomplexa fluidului magnetic calculatse potrivete cucea obinutexperimental [7].

3.3. PutereaPuterea specifispecificcn domeniul microundelorn domeniul microundelor [4][4]

[4] P. C.Fannin, I.Malaescu, C. N.Marin, N, Stefu, Microwave specific loss power of magnetic fluidssubjected to a static magnetic field, Eur. Phys. J. E 27, 145148 (2008)

undeunde

La o frecven, f(Hz), puterea de disipaie,

p, depinde de cmpul magnetic extern iprezintun maxim. Rezultatul obinutsugereazposibilitatea controlriiabsorbiei de energie n microunde afluidelor magnetice prin intermediul unui

cmp magnetic extern aplicat.


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4.4. ParametriiParametrii dede propagarepropagarenn nanosistemenanosisteme dede particuleparticulenn

domeniul microundelordomeniul microundelor [1] [2][1] [2] [3][3]

ntr-un mediu omogeni izotrop,supus aciunii unui cmpelectromagnetic armonic, pornind de laecuaiile lui Maxwell rezult ecuaiaundelor:

Mrimea:

se numete constant de propagare fiindo marime complex ce se poate scrie

sub forma:

Mrimea: se numete impedana intrinsec a mediului, undeZ0=377

Mrimea

se numete coeficientul dereflexie la suprafata desepararie dintre medii.


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------------------------------------------------------------------------------------

[1] P. C. Fannin, C. N. Marin, I. Malaescu, N. Stefu, P. Vlzan, S. Novaconi, S. Popescu, Effect of the concentration of precursors onthe microwave absorbent properties of Zn/Fe oxide nanopowders, J. Nanopart. Res. 13 (2011) 311319

[2] P.C. Fannin, C.N. Marin, I. Malaescu, N. Stefu, P. Vlazan, S. Novaconi, P. Sfirloaga, S. Popescu, C. Couper, Microwave

absorbent properties of nanosized cobalt ferrite powders prepared by coprecipitation and subjected to different thermal treatments,

Materials and Design 32 (2011) 16001604

[3] P. C.Fannin, I.Malaescu, C. N.Marin, N, Stefu, Microwave propagation parameters in magnetic fluids, Eur. Phys. J. E 29, 299

303 (2009)

Cunoaterea parametrilor de propagare este importantpentruobinerea de absorbani electromagnetici pentru protecie

mpotriva polurii electromagnetice.

Astfel n lucrarea [1], s-a urmrit efectul concentraiei precursorilor asupra proprietilor de absorbantelectromagnetic n domeniul microundelor pentru nanopulberi de oxid de Fe-Zn.

x=Fe3+/Zn2+; x(A)=2.8/0.2; x(B)=2.5/0.5; x(C)=1.8/1.2; x(D)=1.5/1.5.


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Rezultate in curs de diseminare

Intra-well relaxation process in magnetic fluids subjected to strong polarising fields

Studiul relaxarii magnetice si a efectului magneto-vascos in nanofluide magnetizabile

Nanosisteme de particule in camp electromagnetic

Teme propuse pentru doctoranzi


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