Cercetare
- Sinteza si caracterizarea combinatiilor complexe de tip carboxilat ale metalelor tranzitionale si studiul descompunerii termice a acestora in vederea utilizarii lor ca precursori ai diferitelor sisteme oxidice: teza de doctorat, 2 lucrari publicate in reviste cotate ISI din strainatate;
- Metode moderne, neconventionale de sinteza a sistemelor oxidice de tip spinel sub forma de nanocristalite: teza de doctorat, 4 lucrari cotate ISI in acest domeniu; 2 participari la conferinte internationale; realizarea de materiale de tip spinel sub forma de nanocristalite, cu proprietati magnetice deosebite in cadrul a 3 proiecte nationale: doua priecte de tip CNCSIS si un proiect PNII.
- Sinteza prin metode originale a nanocompozitelor cu proprietati magnetice controlate: teza de doctorat, 8 lucrari in reviste cotate ISI (5 in strainatate , 2 in tara); 2 participari la conferinte internationale;
- Studiul formarii geluri hibride organic-anorganice pe baza de tetraetilortosilicat si polioli si a comportarii termice a acestora. Caracterizarea morfologica si texturala a matricilor de silice obtinute: teza de doctorat, 4 lucrari in reviste de specialitate cotate ISI (3 in strainatate si 1 in tara).
- Metode fizico-chimice de caracterizare a nanomaterialelor: analiza termica, spectrometrie FT-IR, microscopie SEM-EDX, microscopie TEM, difractie RX.
Lista lucrari publicate in reviste din strainatate cotate ISI
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Nr.
Crt.
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Titlul lucrării
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Autorii
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Publicaţia
( Nr., anul, pag. )
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1
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Influence of thermal treatment on the formation of zirconia nanostructured powder byt hermal decomposition of different precursors
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Stoia, M.; Barvinschi, P.; Barbu-Tudoran, L.; Negrea, A.; Barvinschi, F
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JOURNAL OF CRYSTAL GROWTH Volume: 381 (2013) 93-99
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2.
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Study on the formation of MCr2O4/SiO2 nanocomposites from hybrid gels
PVA–TEOS–metal nitrates
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M. Barbu, M. Stoia*, P. Barvinschi, L. Barbu-Tudoran, M. Stefanescu
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Thermochimica Acta 564 (2013) 43– 50
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3.
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Nanosized zinc and magnesium ferrites
obtained from pva – metal nitrates solutions
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Marcela Stoia1, Lucian Barbu –Tudoran2, Paul Barvinschi3
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J Therm Anal Calorim (2013) 113:11–19
DOI 10.1007/s10973-012-2888-z
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4.
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Thermal decomposition of metal nitrates – PVA – TEOS gels for obtaining M(II) ferrite/silica nanocomposites
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Marcela Stoia1, Paul Barvinschi2, Lucian Barbu-Tudoran3
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J Therm Anal Calorim (2013) 113:21–30
DOI 10.1007/s10973-012-2786-4
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5.
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Influence of thermal treatment on the formation of tetragonal/monoclinic zirconia nanostructured powder by thermal decomposition of different precursors
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Marcela Stoia1, Paul Barvinschi2*, Adina Negrea1, Lucian Barbu-Tudoran3, Floricica Barvinschi4
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Journal of Crystal Growth 381 (2013) 93–99
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6.
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Evaluation of cation influence on the formation of M(II)Cr2O4 during the thermal decomposition of mixed carboxylate type precursors
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Paul Barvinschi1, Mirela Barbu2, Marcela Stoia2, Mircea Stefanescu2
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J Therm Anal Calorim
(2013) 112:359–366
DOI 10.1007/s10973-012-2726-3
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7.
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Study on the formation of CoxFe3-xO4 system using two
low temperature synthesis methods
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Paulina Vlazana, Mircea Stefanescub, Paul Barvinschic, Marcela Stoiab
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Materials Research Bulletin 47 (2012) 4119–4125
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8.
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Or ga nic-inorga nic Hybrid Gels of Diol-TEOS Type.
Synthe sis and Study on the Che mi cal Inte rac tion
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Oana S¸ tefanescu, Marcela Stoia, Mire la Barbu
and Mir cea S¸ tefanescu
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Acta chimica slovenica
2012, 59, 281–288
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9.
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Silica matrices for embedding of magnetic nanoparticles
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Marcela Stoia, Oana Stefanescu, Gabriela Vlase,
Lucian Barbu-Tudoran, Mirela Barbu, Mircea Stefanescu
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J Sol-Gel Sci Technol (2012) 62:31–40
DOI 10.1007/s10971-012-2679-9
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10.
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Synthesis of nanosized zinc and magnesium chromites starting
from PVA–metal nitrate solutions
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Stoia Marcela Elena, Mirela Barbu, Mircea Stefanescu, Paul Barvinschi, Lucian Barbu-Tudoran
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J Therm Anal Calorim
2012, 110; 85-92
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11.
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Studies regarding the formation from metal nitrates and diol
4 of NiM2
IIIO4 spinels, inside a silica matrix
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Marcela Stoia Mircea Stefanescu • Mirela Barbu • Paul Barvinschi • Lucian Barbu-Tudoran
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J Therm Anal Calorim
DOI 10.1007/s10973-011-1994-7
J Therm Anal Calorim (2012)
108:1041-1049
DOI 10.1007/s10973-011-1994-7
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12.
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New synthesis method for M(II) chromites/silica nanocomposites
by thermal decomposition of some precursors formed
inside the silica gels
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Mirela Barbu • Mircea Stefanescu • Marcela Stoia • Gabriela Vlase • Paul Barvinschi
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J Therm Anal Calorim
DOI 10.1007/s10973-011-1933-7
J Therm Anal Calorim (2012)
108:1059-1066
DOI 10.1007/s10973-011-1933-7
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13.
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Synthesis of nanocrystalline nickel ferrite by thermal
decomposition of organic precursors
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Marcela Stoia • Paul Barvinschi •
Lucian Barbu Tudoran • Mirela Barbu •
Mircea Stefanescu
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J Therm Anal Calorim
DOI 10.1007/s10973-011-1903-0
J Therm Anal Calorim (2012)
108:1033-1039
DOI 10.1007/s10973-011-1903-0
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14.
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Novel low temperature synthesis method for nanocrystalline zinc and
magnesium chromites
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Mircea Stefanescu, Mirela Barbu, Titus Vlase, Paul Barvinschi, Lucian Barbu-Tudoran,
Marcela Stoia
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Thermochimica Acta 526 (2011) 130– 136
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15.
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Characterisation of nickel–zinc ferrite/silica nanocomposites
with low ferrite concentration obtained by an improved modified
sol–gel method
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Marcela Stoia • Costica Caizer • Mircea Stefanescu • Paul Barvinschi • Lucian Barbu-Tudoran
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J Sol-Gel Sci Technol (2011) 58:126–134
DOI 10.1007/s10971-010-2365-8
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16.
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Low temperature synthesis of Co2SiO4/SiO2 nanocomposite using a modified sol-gel method
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Marcela Stoia, M. Stefanescu, T. Dippong, O. Stefanescu, P. Barvinschi
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J. Sol-Gel Sci. Technol 54 (2010) 49-56
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17.
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Obtaining of Ni0.65Zn0.35Fe2O4 nanoparticles at low temperature starting from metallic nitrates and polyols
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Mircea Stefanescu, Marcela Stoia, Oana Stefanescu, Paul Barvinschi
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Journal Thermal Analysis and Calorimetry, 99 (2010) 459-464
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18.
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Preparation of CoxFe3-xO4 oxydic system starting from metal nitrates and propanediol
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Mircea Stefanescua, Marcela Stoiaa, Thomas Dipponga, Oana Stefanescua, Paul Barvinschib
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Acta Chimica slovenica, 56 (2009) 379-385
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19.
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PREPARATION OF CoxFe3-xO4 NANOPARTICLES BY THERMAL DECOMPOSITION OF SOME ORGANO-METALLIC PRECURSORS
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Mircea Stefanescu , Marcela Stoia, Costica Caizer, Thomas Dippong, Paul Barvinschi
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Journal Thermal Analysis and Calorimetry, 97 (2009) 245-250
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20.
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Study on the influence of teos-diol molar ratio on their chemical interaction during the gelation process
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Oana Ştefănescu, Marcela Stoia, Mircea Ştefănescu , Titus Vlase
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Journal Thermal Analysis and Calorimetry, 97 (2009) 251-256
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21.
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Preparation of FexOy/SiO2 nanocomposites by thermal decomposition of some carboxylate precursors formed inside the silica matrix
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Oana Ştefănescu, Corneliu Davidescu, Mircea Ştefănescu , Marcela Stoia
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Journal Thermal Analysis and Calorimetry, 97 (2009) 1, 203-208
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22.
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Preparation of x(Ni0.65Zn0.35Fe2O4)/(100-x)SiO2 nanocomposite powders
by a modified sol-gel method
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M. Stefănescu, M.Stoia, O.Stefanescu, C. Caizer
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Materials Chemistry and Physics 113 (1) (2009), pp. 342-348
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23.
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Study on the obtaining of cobalt oxides by thermal decomposition of some complex combinations undispersed and dispersed in SiO2 matrix
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M. Stefanescu, T. Dippong, M. Stoia, O. Stefanescu
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Journal of Thermal Analysis and Calorimetry 94 (2) (2008), pp. 389-393
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24.
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Thermal and FT-IR study of the hybrid ethylene-glicol – silica matrix
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M. Stefanescu,
M. Stoia,
O. Stefanescu
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Journal of Sol-Gel Science and Technology, 41 (2007), 71-78
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25.
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Obtaining of (Ni0.65Zn0.35Fe2O4)x-(SiO2)100-x nanocomposites trough thermal decomposition of glyoxilate type complex compounds embedeed in silica matrix
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M. Stoia, C. Caizer, M. Stefanescu, P. Barvinschi, I. Julean
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Journal of Thermal Analysis and Calorimetry, 88 (2007) 193-200
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26.
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Thermal decomposition of some metal-organic precursor. Fe2O3 nanoparticles
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M. Stefanescu, O. Stefanescu,
M. Stoia, C. Lazau
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Journal of Thermal Analysis and Calorimetry, 88 (2007) 27-32
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27.
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The interaction between TEOS and some polyol. Thermal analysis and FT-IR
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M. Stefanescu
M. Stoia
O. Stefanescu
A. Popa
M. Simon
C. Ionescu
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Journal of Thermal Analysis and Calorimetry, 88 (2007) 19-26
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28.
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„Ultrafine, Perfectly Spherical Ni-Zn Ferrite Nanoparticles, with Ultranarrow Distribution, Isolated in Silica Matrix, Prepared by a Novel Synthesis Method in Liquid Phase”
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M. Stefanescu, C. Caizer, M. Stoia, O. Stefanescu
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Acta Materialia 54 (2006) 1249-1257
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Lucrari publicate in reviste de specialitate din tara cotate ISI
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Nr.
crt.
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Titlul lucrării
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Autorii
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Publicaţia
( Nr., anul, pag. )
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1.
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Ni,Zn/SiO2 ferrite nanocomposites prepared by an improved sol-gel method and their characterization
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M. Stefanescu, C. Caizer, M. Stoia, O. Stefanescu
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J Optoel. Adv. Mat, vol 7, no. 2, 2005, p. 607-614
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2.
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Studiul epurării recuperative a ionilor de nichel şi cobalt
prin precipitare chimică din soluţii reziduale
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G. Gavriş,
G. Burtică,
M. Stoia
V. Chiţac
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Revista de Chimie vol.59 (1), pp.61-64, 2008
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3.
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Preparation of Ni0.65Zn0.35Fe2O4 nanoparticles with
homogenous dispers in silica matrix
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M.Stoia, P. Barvinschi, I. Grozescu, M. Stefanescu
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Journal of Optoelectronics and Advanced Materials - Symposia, Vol. 1, No. 1, 2009, p. 29 - 33
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4
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Synthesis and characterisation of poly(vinil alcohol)/ethylene glycol /silica hybrids.
Thermal analysis and FT-IR study
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M. Ştefănescu1, M. Stoia1, O. Ştefănescu1, C. Davidescu, G. Vlase2
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Revue Roumaine de Chimie, 55 (2010) 17-23
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Lucrari publicate la alte reviste de specialitate din tara
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Nr.
crt.
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Titlul lucrării
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Autorii
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Publicaţia
( Nr., anul, pag. )
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1.
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Synthesis of cobalt oxides starting from Co(NO3)2.6H2O and some diols
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M. Stoia, T. Dippong, O. Stefanescu, G. Gavris, M. Stefanescu
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Analele Universitatii din Oradea – Fascicula Chimie, XVI (2009) 59-64
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2.
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Studies upon removal of lead cation from wastwwater
coming by spent acid solution of electroplating work (i)
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GAVRIS G., STEFANESCU M.,
GAVRIS M., Stoia Marcela, CARABAN A.
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Annals of the Oradea
University. Fascicle of Management and Technological Engineering, VIII(XVIII) (2009) 1073-1078
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3.
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Preparation of β-Tricalcium Phosphate from Precursors Obtained
by a Wet Precipitation Method
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Stoia Marcela Elena, M. Ionescu, O. Stefănescu, R. Murgan, M. Stefanescu
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Chem. Bull. "Politehnica" University
53(67) 2008, 204
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4.
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Rheological Studies of some Ethylene-Glycol – TEOS Gels
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A.Tămaş, Stoia Marcela Elena, M. Ştefănescu
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Chem. Bull. "Politehnica" University
53(67)2008, 269
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5.
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Synthesis of magnetic nanocomposites x%(Ni0.75Zn0.25Fe2O4)/(100-x)%SiO2 by a sol-gel method
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Stoia M., M. Ştefănescua, Caizer C.b, O. Stefănescua
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Annals West Univ. Series of Chemistry, 16 (4) (2007) 87-94
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6.
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Study on the obtaining of Fe2O3/SiO2 nanocomposites through a modified sol-gel method
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O. Stefănescua, M. Ştefănescua, M. Stoiaa,
P. Barvinschib, T. Dipponga
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Annals West Univ. Series of Chemistry, 16 (4) (2007) 79-86
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7.
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Study on the formation of cobalt oxides nanoparticles
in silica matrix by a sol-gel method
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T. Dipponga, M. Ştefănescua, M. Stoiaa,
O. Stefanescua, G. Gavrisb
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Annals West Univ. Series of Chemistry, 16 (4) (2007) 35-42
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8.
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Ultrafine magnetic particles embedded in a silica matrix obtained by a new chemical route of synthesis
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M. Stefanescu, C. Caizer, M. Stoia, O. Stefanescu
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Annals of WestUniversity of Timisoara, ser. Fiz. XLV, p.19-24
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9.
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Titrimetric and Gravimetric Determination of Piperazine Adipate from Pharmaceutical Preparations with Diaminotetrathiocyanato-cromate (III) Complexes
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Didina Oprescu, Marcela Stoia, Veronica Chiriac
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Annals of WestUniversity of Timişoara, Series Chem., 9 (1), 2000, 19
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10.
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Studies on the Formation of the Spinel Phase Ni0.36Zn0.64Fe2O4 and its Magnetic Properties
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M. Ştefănescu, C. Caizer, Cornelia Muntean, Marcela Stoia, M. Bîrzescu
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Chem. Bull. ”Politehnica” Univ. (Timişoara), 45(59), No.1 (2000) 30
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11.
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Titrimetric Determination of Procaine Hydrochloride from Farmaceutical Preparations with Ammonium Diaminotetrathiocyanato – Cromate (III) Complexes
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Didina Oprescu, Marcela Stoia, Veronica Chiriac
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Chem. Bull.”Politehnica” Univ. (Timişoara) 45(59), No.1 (2000) pg. 25
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12.
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Conditions and practical consequences of aluminium activ anodic dissolution in electrochemical water treatement
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C. Radovan, I. Vlaicu, G. Ciorba, M. Adam-Stoia
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Annals of WestUniversity of Timisoara, ser. Chem.. 6 (1997),259
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Volumele unor manifestări ştiinţifice din străinătate
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Nr.
crt.
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Titlul lucrării
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Autorii
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Publicaţia
( Nr., anul, pag. )
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1
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Characterization of Co(II) carboxylates resulted in the Co(NO3)2 – C3H8O2 reaction by acidic-basic electrometric titrimetry
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Dippong Thomasa, Marcela Stoiaa, Paul Barvinschib, Mircea Stefanescua
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Proceeding XVth Symposium on analytical and Environmental Problems, 22 sept. 2008, Szeged, Hungaria 978-963-482-903-4, 271
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2.
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Study on the obtaining of CoxOy starting from Co(NO3)2∙6H2O and ethylene glycol
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T.Dippong, M.Stoia, M.Stefanescu
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Proceeding XIVth Symposium on analytical and Environmental Problems, 24 sept. 2007, Szeged, Hungaria 134,138
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3.
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Researches regarding the obtaining of the pk fertilizers with microelement cu from the system k4p2o7 – cuso4
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M.Ciopec, A.Iovi, P.Negrea, L.Lupa, M.Stoia, G.Mosoarca
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Research people and actual task on multidisciplinary sciences, First conference, 6-8 june 2007, Lozenec, Bulgaria, Volume 3, pp.188, isbn 978-954-91147-3-7
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4.
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Theoretical and practical aspects of aluminium anodic behavior in electrochemical water treatment
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C. Radovan, I. Vlaicu, G. Ciorba, M. Adam-Stoia
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Electrochemical Society Proceedings Vol. 97-98 (1998), 427-438.
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Volumele unor manifestări ştiinţifice internaţionale organizate în România (cu referenţi ştiinţifici) şi redactate integral într-o limbă de circulaţie internaţională
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Nr.
crt.
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Titlul lucrării
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Autorii
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Publicaţia
( Nr., anul, pag. )
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1.
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The synthesis of the Ni, Zn ferrite through thermal conversion of carboxylic forerunners resulted in the reaction between metallic nitrates and different polyols.
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M. Stefanescu, Oana Stefanescu , Marcela Stoia
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Proceedings RICCCE XIV, Vol 1, Section 8, 2005, pg. S08-29 - 37
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Granturi de cercetare-dezvoltare naţionale (MEC) şi contracte de cercetare-dezvoltare în programe naţionale
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Nr.
crt.
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Nr. grant/contract, anul
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Denumire grant/contract
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Beneficiar
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Director / colaborator
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1.
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PN II Parteneriate
26/2007 2007-2010
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Cercetari complexe privind obtinerea si proprietatile magnetice ale sistemelor de nanoparticule ferimagnetice de CodFe3-dO4surfactate/nesurfactate si biocompatibile cu potentiale aplicatii in terapia cancerului
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CNMP
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Responsabil stiintific
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2.
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CEEX PC-D04-PT04-259/2005-2007, subcontract 4/ contract 37
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Obtinerea prin metode alternative de nanocristale de TiO2 dopate cu ioni metalici. Studiul aplicatiilor pentru sanatate, biologie si mediu, conducator de proiect ICEMC Timisoara
33.000 RON/2005-2007
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MEC
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colaborator
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3.
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Grant CNCSIS tip A 648/2005, 2006
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Nanocompozite de tip NixZn(1-x)Fe2O4 cu proprietati magnetice dirijate, obtinute prin doua metode neconventionale de sinteza, originale
11.000 RON
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MEC
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colaborator
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4.
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Grant CNCSIS tip A, cod CNCSIS 728/2006,2007
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Cercetari fundamentale si fundamental-aplicative privind sistemele de nanoparticule ferimagnetice, spinelice, disperse
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MEC
|
colaborator
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5.
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Grant CNCSIS tip A, cod CNCSIS 35, Nr. 35034/1999, tema 15
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Sinteza unor compusi noi, derivati ai acidului sulfosalicilic
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MEC
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colaborator
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Teza de doctorat
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Nr.
Crt.
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Titlul lucrării
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Autorii
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Editura, anul, nr. Pagini, ISBN
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1.
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Teza de doctorat : Contributii la obtinerea de nanomateriale cu proprietati magnetice nedispersate si dispersate in matrici anorganice
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M. Stoia
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Editura Politehnica Timisoara, 2007, 186 pag.
ISBN: 978-973-625-463-5
ISSN 1842-8444
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