INFLUENTA COMPOZITIEI SI A STRUCTURII ASUPRA CARACTERISTICILOR TERMODINAMICE, ELECTRICE SI MAGNETICE ALE MATERIALELOR OXIDICE MICRO SI NANOSTRUCTURATE CU PROPRIETATI MAGNETOREZISTIVE SPECIALE

(CMR-TEM)


  Rezumat

  Obiective si Activitati

  Parteneri

  Rezultate

  Adrese utile

 

AnI-2006

AnII-2007

AnIII-2008

AnIV-2009

 

REZULTATE 2006


- Organizarea activitatii in cadrul proiectului tinand seama de complexitatea temei;
- Raport stiintific complet din literatura privind materialele oxidice caracterizate prin rezistenta magnetica colosala;
- Studiu privind identificarea unor noi materiale oxidice micro si nanostructurate cu magnetorezistenta colosala (CMR) pe baza analizei complexe a urmatoarelor aspecte:
• Caracteristicile structurale, energetice si morfologice ale compusilor cu structura tip perovskita, cu referire speciala la manganiti
• Natura efectului magnetorezistiv in cazul materialelor oxidice de tip manganit, insistandu-se asupra punctelor cheie in explicarea fenomenului si anume
- Specificitatile mecanismului de dublu schimb magnetic
- Modelul de transport polaronic
- Natura defectelor punctuale in compusii magnetorezistivi
- Posibilitatile de corelare a proprietatilor termodinamice cu schimbarile de compozitie, structura si dimensiune a particulelor
- Identificarea posibilitatilor de control si optimizare a proprietatilor compusilor magnetorezistivi cu structura perovskitica
- Studiu privind elaborarea metodelor specifice de caracterizare termodinamica, structurala, morfologica, a caracteristicilor electrice si magnetice
- Achizitionarea de echipamente necesare masuratorilor de caracterizare
- Elaborarea de lucrari stiintifice in tematica proiectului.


A. Lucrari ISI publicate in tematica grantului:

1. S.Tanasescu, C. Marinescu, F. Maxim, O.Raita, M.N. Grecu, L.Giurgiu, Thermodynamic properties and spin dynamics of some micro and nanostructured magnetoresistive lanthanum manganites, Journal European Ceramic Society 26, 3005, (2006)
2. S. Tanasescu, F. Teodorescu, F. Maxim, L.Giurgiu, The influence of particle size and composition on the thermodynamic, properties and spin dynamics of perovskite type materials, J. Nanoscience and Nanotechnology, sub tipar

B. Capitol in Carte publicat in tematica grantului

1. Speranta Tanasescu, Size effects controlling the toxicity and energetics of nanostructured oxide materials, Capitol in volumul Convergence of micro- and nano-biotechnologies, Editura Academiei, seria Micro and Nanoengineering, nr. 9, p. 59-76, 2006

C. Participari la manifestari stiintifice internationale si nationale:
1. S. Tanasescu, The effect of composition and particle size on the thermodynamic properties of micro and nanostructured perovskite type materials, Key-note, 12th International Conference of Physical Chemistry - ROMPHYSCHEM–12 Bucharest, Sept. 2006
2. S. Tanasescu, F. Maxim, Studies on the thermodynamic stability of the EuMnO3 perovskite-type oxide, 12th International Conf. of Physical Chemistry - ROMPHYSCHEM–12 Bucharest, Sept. 2006
3. L. M. Giurgiu, M. N. Grecu Size and core-shall effects as seen by EPR in nanosized manganites, 5th International Conf. of Inorganic materials, Ljubljana, Slovenia, 23-27 Sept. 2006
4. L.M. Giurgiu, Effects of size reduction and Mn- substitution as seen by ESR in La2/3Ca1/3MnO3 manganites-lectie plenara, “Current Trends in Nanoscopic and Mesoscopic Magnetism” Santorini, Greece 6-9 Sept. 2006
Speranta Tanasescu, Prezentarea Proiectului CEEX 94/2006, Simpozion CEEX-Matnantech, Sinaia, 02-05 noiembrie 2006

REZULTATE 2007  

-          Implementarea unor sisteme, metode si tehnici experimentale avansate privind sinteza materialelor oxidice micro si nanostructurate cu magnetorezistenta colosala (CMR)

-          Evidentierea conditiilor de sinteza optime pentru obtinerea proprietatilor in conditii controlate

-          Punerea la punct a unor metode noi neconventionale de obtinere in situ a unor compuşi noi, cu compoziţie predeterminată, prin variaţia stoichiometriei oxigenului în condiţii controlate

-          Realizarea unor instalatii si celule de lucru noi, respectiv adaptarea unor instalatii existente in vederea realizarii masuratorilor experimentale preliminare

-          Elaborarea metodelor specifice de caracterizare termodinamica, structurala, morfologica, a caracteristicilor electrice si magnetice

-          Studii privind influenta diferitelor variabile compozitionale asupra proprietatilor termodinamice si dinamicii de spin ale compusilor CMR

-          Achizitionarea de echipamente necesare masuratorilor de caracterizare termodinamica si a dinamicii de spin

-          Elaborarea de lucrari stiintifice in tematica proiectului.

-          Organizarea unei manifestari stiintifice in vederea diseminarii rezultatelor proiectului

 Lucrari publicate si in curs de publicare

1.        Speranta Tanasescu, Florentina Maxim, Florina Teodorescu, Liviu Giurgiu, The Influence of Composition and Particle Size on Spin Dynamics and Thermodynamic Properties of some Magnetoresistive Perovskites, Journal for Nanoscience and Nanotechnology, in press.

  1. Speranta Tanasescu, Thermodynamics of some micro- and nanostructured conducting transition metal oxides, Proceedings of the International Conference on Materials Science and Engineering - Bramat, februarie, 2007, Full text on CD-ROM (p. 47-54), 2007.

Lucrari comunicate la manifestari stiintifice internationale

  1. Speranta Tanasescu, Thermodynamics of some micro- and nanostructured conducting transition metal oxides, Prezentare la International Conference on Materials Science and Engineering - Bramat, 22-24 februarie, 2007.
  2. L.M. Giurgiu, Magnetic Resonance in Nano-range, Prezentare la International Conference on Materials Science and Engineering - Bramat, 22-24 februarie, 2007.
  3. M. N. Grecu, L. M. Giurgiu, Al. Darabont, G. Papavassiliou Comparative EPR study of La2/3Ca1/3MnO3 bulk and thin films, XIII Conference of Sociedade Portuguesa de Materias (MATERIAS 2007); IV International Materials Symposium – A Materials Forum, Porto, Portugal, 1-4 Aprilie 2007
  4. A. Popa, D. Toloman, M.N. Grecu, G. Mihailescu, Al. Darabont, C.V. Pop, O. Raita, M. Fardis, S. Idzak, S.K. Hoffmann, L.M. Giurgiu, „Polaron Activation Energy as Evidenced by EMR in CMR Nanowires, XXII International Conference on Radio and Microwave Spectroscopy (RAMIS 2007), Poznan-Bedlewo, Poland, April 2-25, Abstracts Book, P-42
  5. A. Popa, C. Craciun, M.N. Grecu, Al. Darabont, D. Toloman, O. Raita, M. Fardis, Grecia, L. Giurgiu, M.D.Glinchuck, Core shell effects as seen by EPR in La2/3Ca1/3 MnO3, EUROMAR, Magnetic Resonance  Conference, 1-5 iulie 2007, Tarragona, Spania
  6. S. Tanasescu, C. Marinescu, F. Teodorescu, A. Sofronia, Effects controlling thermodynamics in micro and nanostructured conducting transition metal oxide systems, Workshop and Meeting of the Associated Phase Diagram and Thermodynamics, 28-30 Sept. 2007
  7. S. Tanasescu, F. Maxim, C. Marinescu, F. Teodorescu, The Characterization of Micro- and Nanostructured Multifunctional Oxide Systems Based on a Complex Thermodynamic Approach, European Congress on Advanced Materials and Processes - EUROMAT, Nurenberg, Germany, 10-13 September 2007
  8. F. Maxim, P. Ferreira, P. M. Vilarinho, The influence of structure and morphology of Ti precursor on hydrothermal synthesis of BaTiO3 nanoparticles, Simpozion Advanced Nanostructures - EUROMAT, Nurenberg, Germany, 10-13 Sept. 2007
  9. L. Giurgiu, M.N. Grecu, Al. Darabont, A. Popa, D. Toloman, O. Raita, S. Tanasescu, V.V. Grecu, S. Hoffman, M.D. Glinchuk, G. Papavassiliou, M. Fardis, EPR comparison of the spin dynamics in nanoparticles, nanowires and bulk colossal magnetoresistive manganites, International Semiconductor Conference, CAS-2007, p.20, Sinaia, 15-17 octombrie 2007.

10.    C.Craciun, A.Popa, M.N.Grecu, Al.Darabont, D.Toloman, O.Raita, V.V.Grecu, M.Glinchuck, M.Fardis and L.M.Giurgiu, An EPR Investigation of the Core-Shell Effects in CMR Nanoparticles, 1-st Conference: Nanostructured Multifunctional Materials, NMM-2007, p.58, Sinaia, Romania, octombrie 2007

11.     L M.Giurgiu, What does ESR Spectroscopy tell us about Size dependent Phenomena in Nano Systems? 1-st Conference: Nanostructured Multifunctional Materials, NMM-2007, Sinaia, octombrie, 2007

12.     S. Tanasescu, C. Marinescu, F. Teodorescu, D. Chiscan, Thermodynamic data and stability of some micro- and nanostructured SOFC materials, Poster presentation at Summer School Fuel Cells – Fundamentals Materials &Electrochemical Aspects, 17-20 July 2007, Sibiu, Romania

13.     C. Marinescu, F. Teodorescu, D. Chiscan, S. Tanasescu, Investigation of the correlation between the nonstoichiometry and the thermodynamic properties of some SOFC materials, Poster presentation at Summer School Fuel Cells – Fundamentals Materials &Electrochemical Aspects, 17-20 July 2007, Sibiu, Romania

       Lucrari prezentate la manifestari stiintifice nationale

1.                    S. Tanasescu, C. Marinescu, F. Teodorescu, Energetic parameters controlling the properties of some micro and nanostructured conducting transition metal oxides, Al 6-lea Seminar National de Nanostiinta si Nanotehnologie, Bucuresti, 26 March 2007, (on web: http://www.romnet.net/nano/membership/login.php).

2.                    L.M.Giurgiu, Challenges for Magnetic Resonance in Nano Systems, Al VI-lea Seminar National de Nanostiinta si Nanotehnologii, Bucuresti, 26 March 2007, presentation on web (http://www.romnet.net/nano/membership/login.php).

3.                    V. V. Grecu, M. N. Grecu, Ferromagnetic resonance of magnetic nanoparticles, size, and surface effects, Fifth Conference PIM 2007, Satelite Workshop Local disorder at nanoscale, Cluj-Napoca, Romania, September 20-22, 2007, Abstracts, p. 81

4.                   M. N. Grecu, V. V. Grecu, L. M. Giugiu, T. Petrisor, Fifth Conference PIM 2007, Ferromagneic resonance on thin magnetic layers, Satelite Workshop Local disorder at nanoscale, Cluj-Napoca, Romania, September 20-22, 2007, Abstracts, p. 84

5.                   S. Tanasescu, Sinteza unor materiale micro si nanostructurate din sistemul La1-xAxMn1-yByO3 (unde A = Ca, Sr, Ba; 0<x<1; B=Fe, Co; 0<y<0.1) prin metode si tehnici experimentale avansate. Masuratori experimentale preliminare pentru caracterizarea noilor materiale, Al X-lea Simpozion Matnantech, Cap Aurora, 03-08 iulie 2007

6.                   S. Tanasescu, Influenta compozitiei si a structurii asupra caracteristicilor termodinamice, electrice si magnetice ale materialelor oxidice micro si nanostructurate cu proprietati magnetorezistive speciale, Al XI-lea Simp. Matnantech, Sinaia, 19-22 noi. 2007

7.                   S. Tanasescu, The Laboratory of Chemical Thermodynamics: contribution to characterize and investigate from the energetic point of view the advanced materials involved in the complex modern systems and the new technologies, prezentare sub forma de poster la SALONUL CERCETARII, 4-5 oct. 2007, Bucuresti, Romania

8.                   S. Tanasescu, Influenta compozitiei si a microstructurii asupra comportamentului termodinamic al unor materiale oxidice micro si nanostructurate utilizate in pilele de combustie, prezentare orala la WorkshopulNanomaterialele si aplicatiile acestora in pilele de combustie cu electrolit solid, 12 oct. 2007, Bucuresti.

 

Comunicari in cadrul unor actiuni de brokerage organizate in tara sau strainate in vederea participarii la Programul FP7 al Uniunii Europene.

1         S. Tanasescu, The control of the energetic parameters: important step in understanding the stability and reactivity of the micro and nanostructured materials, Info- and brokerage event in new technologies and materials (FP7/2007: NMP/ICT), 22-23 March 2007, Bucharest, presentation on web (http://www.minos-euro.net/brokerage/members/login.php).

2         S. Tanasescu, The characterization of micro- and nanostructured multifunctional systems based on a complex thermodynamic approach, Info- and brokerage event: Micro- and nanosystems call in FP7/2007, 23-25 May 2007, Bucharest, Romania (http://www.minos-euro.net/brokerage/members/login.php).

3         H. Chiriac, Info- and brokerage event: Micro- and nanosystems call in FP7/2007, 23-25 May 2007, Bucharest, Romania (http://www.minos-euro.net/brokerage/members/login.php).

 

Conectarea la platforme europene de cercetare

  1. Speranta Tanasescu,Institute of Physical Chemistry - Main areas of interest in FP7,  prezentare la Meeting of ETP Nanomedicine / Mirror Group, January 23, 2007, Abano Terme (Padova)
  2. S. Tanasescu, The control of the energetic parameters: important step in understanding the stability and reactivity of the micro and nanostructured materials for nanomedicine use, General Assembly of the European Technology Platform Nanomedicine & Workshop on Drug Delivery materials, Chalkidiki, Grecia, 12-13 Sept. 2007

 

 Includerea în teze de doctorat a rezultatelor cercetărilor efectuate.

Tinerii doctoranzi Marinescu Cornelia si Florentina Maxim care fac parte din echipa de lucru a proiectului valorifica direct prin programul lor de doctorat rezultatele privind studiul termodinamic al compusilor oxidici investigati.  

Participarea tinerilor cercetatori la cursuri de instruire

Tinerii doctoranzi Marinescu Cornelia, Florina Teodorescu si Chiscan Daniela au participat la cursurile Scolii de vara Summer School Fuel Cells – Fundamentals Materials &Electrochemical Aspects, 17-20 July 2007, Sibiu, Romania  

Organizarea unei manifestari in vederea diseminarii rezultatelor proiectului

Workshop and Meeting of the Associated Phase Diagram and Thermodynamics Committee, 28-30 Sept. 2007.

 

REZULTATE 2008

 

  • Aplicarea unor sisteme si metode noi de caracterizare termodinamica, electrica si spectroscopie Mossbauer
  • Studii privind influenta diferitelor variabile compozitionale asupra proprietatilor termodinamice si dinamicii de spin ale compusilor CMR
  • Studii privind optimizarea proprietatilor materialelor oxidice multicomponente (micro si nanostructurate) cu rezistenta magnetica colosala-CMR pornind de la aplicarea unor metode noi de sinteza si caracterizare
  • Implementarea unor structuri si sisteme chimice cu proprietati CMR superioare
  • Model conceptual privind optimizarea proprietatilor materialelor oxidice multicomponente (micro si nanostructurate) cu rezistenta magnetica colosala-CMR pornind de la aplicarea unor metode noi de sinteza si caracterizare
  • Conectarea la platforme europene de cercetare
  • Achizitionarea de echipamente
  • Elaborarea de lucrari stiintifice in tematica proiectului.
  • Comunicari aprobate si sustinute la conferinte de specialitate
  • Organizarea unei manifestari stiintifice in vederea diseminarii rezultatelor proiectului

 

   Lucrari publicate si in curs de publicare

  • Speranta Tanasescu, Florentina Maxim, Florina Teodorescu, Liviu Giurgiu, “The Influence of Composition and Particle Size on Spin Dynamics and Thermodynamic Properties of some Magnetoresistive Perovskites”, Journal for Nanoscience and Nanotechnology, 8, 914–923 (2008)
  • M. Sima, I. Enculescu, M.N. Grecu, M. Secu, Ma. Sima, E. Matei, V. Vasile, Luminescence and EPR study of ZnO:Cu:Mn nanowire array, Physica E 40, 2494-2498 (2008)
  1. S. Tanasescu, C. Marinescu, F. Teodorescu, A Sofronia, The Control of the Energetic Parameters: Important Step in Understanding the Stability and Reactivity of Micro and Nanostructured Materials, World Journal of Engineering, 5, 738-739, 2008
  2. V. Pârvulescu, S. Şomăcescu, P. Osiceanu, S. Tanasescu, B-L. Su, Mezoporous TiO2-Y2O3-ZrO2 oxides with crystalline framework obtained by surfactant template synthesis, Studies in surface science and catalysis, 174 A, 309-312, 2008.
  3. R. M. Piticescu, R. Orban, S. Tanasescu, R. Piticescu, V. Badilita, M. Lucaci, Correlations between nanostructure and thermodynamic properties of NiAlMex-alumina composites, in “New applications of micro- and nanotechnologies", Vol. 12 Series “Micro and Nanoengineering”, Ed. Academiei Romane, 2008.
  • C. Marinescu, F. Teodorescu, S. Tanasescu, Comparative thermodynamic study of some doped micro- and nano- structured lanthanum manganites, Proceedings of the EMCC5 Conf. (5th Chemical Engineering Conference for Collaborative Research in Eastern Mediterranean Countries), Cetraro, Italia, 24-29 mai 2008, p. 197-200.
  1. F. Teodorescu, C. Marinescu, A. Sofronia, S. Tanasescu, The influence of the nonstoichiometry on the thermodynamic properties of lanthanum doped manganites, Proceedings of the EMCC5 Conf. (5th Chemical Engineering Conference for Collaborative Research in Eastern Mediterranean Countries), Cetraro, Italia, 24-29 mai 2008, pag. 201-204.
  • A. Popa, D. Toloman, M.N. Grecu, G. Mihailescu, Al. Darabont, C.V.L. Pop, O. Raita, M. Fardis, S.K. Hoffmann, L. M. Giurgiu, Polaron activation energy as evidenced by EMR in CMR nanowires, Appl. Magn. Reson., in press
  • M.N. Grecu, S. Constantinescu, V.V. Grecu, R.Olar, M. Badea, R. Turcu, Magnetic characterization of some nanometric ferric oxides, Hyperfine Interactions, in press
  1. Speranta Tanasescu, Maria Nicoleta Grecu, Cornelia Marinescu, Liviu Mihail Giurgiu, Horia Chiriac, Maria Urse, Effects of dopants and oxygen nonstoichiometry on the thermodynamic, magnetic and electrical properties of micro- and nanostructured perovskite-type materials, sub tipar la Advances in Applied Ceramics.
  2. M.N. Grecu, L.M. Giurgiu, Al. Darabont, T. Petrisor Jr., L. Ciontea, G. Papavassiliou, Comparison of bulk and thin films La2/3A1/3MnO3 (A=Ca, Sr) manganites as seen by electron paramagnetic resonance, Proceedings of the 16th International Conference on Defects in Insulating Materials – ICDIM 2008, August 24-29, Aracaju, Brazil, in press, J. Phys. Conf. Series.

¨  Lucrari comunicate la manifestari stiintifice internationale in strainatate

  1. Speranta Tanasescu, Key parameters controlling the stability and reactivity of micro and nanostructured materials: Particle size versus energetics of nanomaterials, HOT NANO TOPICS 2008, Special Symposium on Nanosafety, Portoroz, Slovenia, 23-30 May 2008 (Invited lecture) 
  2. C. Marinescu, F. Teodorescu, S. Tanasescu, Comparative thermodynamic study of some doped micro- and nano- structured lanthanum manganites, Conferinta EMCC5 (5th Chemical Engineering Conference for Collaborative Research in Eastern Mediterranean Countries), Cetraro, Italia, 24-29 mai 2008, poster
  3. F. Teodorescu, C. Marinescu, A. Sofronia, S. Tanasescu, The influence of the nonstoichiometry on the thermodynamic properties of lanthanum doped manganites, Conferinta EMCC5 (5th Chemical Engineering Conference for Collaborative Research in Eastern Mediterranean Countries), Cetraro, Italia, 24-29 mai 2008, poster
  4. A. Popa, M. Jivanescu, L. M. Giurgiu, U. Ebels, M. Darques, L. Piraux, A ferromagnetic resonance investigation of Co nanowire arrays, EUROMAR, Magnetic Resonance Conference, 6-11 iulie 2008, St. Petersburg, Russia
  5. O. Raita, A. Baldansuren, A. Ene, A. Popa, Al. Darabont, M. N. Grecu, D. Toloman, R. R. Piticescu, R. Piticescu and L. M. Giurgiu, Magnetic resonance investigations of nanostructured Zn1-xTMxO (TM = Mn, Fe, Co) magnetic semiconductors, EUROMAR, Magnetic Resonance Conference, 6-11 iulie 2008, St. Petersburg, Russia
  6. L. M. Giurgiu, C. Craciun, A. Popa and M. D. Glinchuk, Separation of the core-shell contribution to the EPR spectra in LCMO nanoparticles, EUROMAR, Magnetic Resonance Conference, 6-11 iulie 2008, St. Petersburg, Russia
  7. M.N. Grecu, V.V. Grecu, T. Petrisor Jr., M.S. Gabor, L.M. Giurgiu, EMR on magnetorezistive manganite thin films, European Magnetic Resonance Congress - EUROMAR 2008, July 6-11, St. Petersburg, Russia, Abstract. Book, p. 225
  8. S. Tanasescu, C. Marinescu, F. Teodorescu, A. Sofronia, The Control of the Energetic Parameters: Important Step in Understanding the Stability and Reactivity of Micro and Nanostructured Matrerials, 16th Annual International Conference on Composites/Nano Engineering (ICCE-16), Kunming, Yunnan Province, China, 20-26 iulie 2008 (prezentare orala)
  9. M.N. Grecu, L.M. Giurgiu, Al. Darabont, T. Petrisor Jr., L. Ciontea, G. Papavassiliou, Comparison of bulk and thin films La2/3A1/3MnO3 (A=Ca, Sr) manganites as seen by electron paramagnetic resonance,16th International Conference on Defects in Insulating Materials – ICDIM 2008, August 24-29, Aracaju, Brazil, Abstr. book A 172
  10.  M.N. Grecu, S. Constantinescu, S. Georgescu, A.M. Chinie, P. Pascuta, E. Culea, EPR, Mossbauer, and luminescence of Gd3+ and Eu3+ centers in the bismuthate glasses, International Conference of Defects in Insulating Materials, 24-29 August 2008, Aracaju, Brazil, CD Abstracts ICDIM2008, A173.pdf
  11. Speranta Tanasescu, Cornelia Marinescu, Florina Teodorescu, The Influence of Particle Size and Nonstoichiometry on the Thermodynamic Properties of Conducting Transition Metal Oxides, 20th International Conference on Chemical Thermodynamics, Varsovia, 3-8 august 2008 (prezentare orala)
  12. C. Marinescu, F. Teodorescu, F. Maxim, S. Tanasescu, Thermodynamics of Micro and Nanostructured Magnetoresistive Lanthanum Manganites, 20th International Conference on Chemical Thermodynamics, Varsovia, 3-8 august 2008 (poster)
  13. Speranta Tanasescu, The control of the Energetic Parameters: Important Step in Understanding The Stability and Reactivity of Micro and Nanostructured Materials, Advanced in Ceramic Science and Engineering, Nonmetallic Inorganic Materials, ETH Zurich, 4-6 septembrie 2008 (poster)
  14. Speranta Tanasescu, Maria Nicoleta Grecu, Cornelia Marinescu, Liviu Mihail Giurgiu, Horia Chiriac, Maria Urse, Effects of dopants and oxygen nonstoichiometry on the thermodynamic, magnetic and electrical properties of micro- and nanostructured perovskite-type materials,  Electroceramics XI (Symposium K: Superconductors and Magnetic Materials), UK, 31 august – 4 septembrie 2008 (prezentare orala)
  15. Speranta Tanasescu, Cornelia Marinescu, Ancuta Sofronia, Adelina Ianculescu, Liliana Mitoseriu, Thermodynamic investigation of the (1-x)BiFeO3-xBaTiO3 solid solutions, Electroceramics XI (Multiferroics) UK, 31 august – 4 sept. 2008 (poster)
  16. V. Pârvulescu, S. Şomăcescu, P. Osiceanu, S. Tanasescu and B-L. Su, Mezoporous TiO2-Y2O3-ZrO2 oxides with crystalline framework obtained by surfactant template synthesis, 4th INTERNATIONAL FEZA CONFERENCE, September 2-6, 2008, "Zeolites and Related Materials: Trends, Targets and Challenges", Paris, France

¨Lucrari prezentate la manifestari stiintifice internationale in tara

1. S. Tanasescu, Energetic parameters controlling the properties of micro and nanostructured multifunctional materials, Prezentara orala la EOARD 2008, Workshop "EXPLORING ROMANIAN RESOURCES IN MATERIALS RESEARCH", Brasov, Romania, July 7 – 8, 2008.
2. S. Tanasescu, Grain and size dependent thermodynamic data: Applications to the phase diagrams evaluations and oxide-based composite materials characterization, International Conference of Physical Chemistry ROMPHYSCHEM-13, 3-5 septembrie 2008 (prezentare orala)
3. A.C. Marinescu, F. V. Maxim, R. Valcu, S. Tanasescu, N. Totir, Evaluation of manganese and oxygen content in La-Mn perovskites by electrochemical and chemical methods, International Conference of Physical Chemistry ROMPHYSCHEM-13, 3-5 septembrie 2008 (prezentare orala)
4. A. Sofronia, C. Marinescu, A. Petcu, F. Teodorescu, A Ianculescu, L. Mitoseriu, S. Tanasescu, Thermodynamic investigation of the barium titanate based ceramics, International Conference of Physical Chemistry ROMPHYSCHEM-13, 3-5 sept. 2008 (prezentare orala)
5. D.A. Neacsu, A.C. Marinescu, A. Sofronia, S Tanasescu, Mathematical modeling and simulation of equilibrium thermodynamic properties and phase diagramsof some alloys, International Conf. of Physical Chemistry ROMPHYSCHEM-13, 3-5 sept. 2008 (poster)
¨Lucrari prezentate la manifestari stiintifice nationale

  • Speranta Tanasescu, Cornelia Marinescu, Ancuta Sofronia, Florina Teodorescu, Influenta dimensiunii particulelor asupra si energeticii fazelor de oxizi: Aplicatii la evaluarea diagramelor de faze si la caracterizarea materialelor nanocompozite, A 7-a Editie a Seminarului National pentru Nanostiinte si Nanotehnologie, Academia Romana , martie 2008
  • Roxana Mioara Piticescu, Radu Orban, Speranta Tanasescu, Corelatii proprietati mecanice-nanostructura in materiale compozite avansate cu distributie miez-invelis, A 7-a Editie a Seminarului National pentru Nanostiinte si Nanotehnologie, Academia Romana, martie 2008
  • Liviu Mihail Giurgiu, Magnetic Resonance, PNCDI-II and Transylvanians, A 7-a Editie a Seminarului National pentru Nanostiinte si Nanotehnologie, Academia Romana, martie 2008
  • Florina Teodorescu, Prezentare la Al 13-lea Simpozion National CEEX-Matnantech, Sinaia, 4-7 septembrie 2008.

 

¨Conectarea la platforme europene de cercetare
S. Tanasescu, "General Assembly of the European Technology Platform ETP Nanomedicine", Workhop on Drug delivery & Brokerage event, Madrid, Spania 25-26 septembrie 2008 (prezentare orala)
¨   Includerea în teze de doctorat a rezultatelor cercetărilor efectuate.
Tinerii doctoranzi Marinescu Cornelia, Anca Sofronia si Florentina Maxim care fac parte din echipa de lucru a proiectului valorifica direct prin programul lor de doctorat rezultatele privind studiul termodinamic al compusilor oxidici investigati.
¨ Participarea tinerilor cercetatori la cursuri de instruire
1. Doctoranzii Cornelia Marinescu si Florina Teodorescu au participat in perioada 24-29 iunie 2008 la cursurile “Summer School of Calorimetry and Thermal Analysis” organizate in Lyon, Franta de catre CNRS Institut de recherches sur la catalyse et l'environnement din Lyon si de Universitea din Lyon.
2. Doctorand Cornelia Marinescu si Masterand Neacsu Dana Andreea au participat in perioada, 9-13 iunie 2008  la doua cursuri European Advanced Training Courses: “Computer-Aided Thermodynamics” si “Simulation of Phase Transformations” organizate de Max-Planck-Institut, in Maria Laach, Germania.
¨ Organizarea de manifestari stiintifice la care sa fie diseminate rezultatele cercetarilor
Institutul de Chimie Fizica “Ilie Murgulescu” a organizat International Conference of Physical Chemistry ROMPHYSCHEM-13, 3-5 septembrie 2008 in programul careia au fost incluse lucrari (a se vedea lista lucrarilor comunicate) prin care sunt diseminate o serie dintre rezultatele obtinute in cadrul proiectului.

 

REZULTATE 2009

  • S-au sintezat pulberile din materiale nanocristaline prin diferite metode de sinteza pe cale umeda (metoda de coprecipitare cu diferiti agenti de precipitare, metoda de combustie, metoda sol-gel, metoda hidrotermala)
  • S-a realizat caracterizarea structurala si morfologica
  • S-au obtinut pe cale experimentala marimile termodinamice ale compusilor din sistemele analizate
  • Au fost investigate transformarile de faza pentru probele nanostructurate
  • S-au determinat marimile termodinamice pe pulberi si tablete
  • S-a studiat corelatia compozitie/microstructura/proprietati si s-a pus in evidenta influenta metodei de sinteza si a aparametrilor de procesare asupra proprietatilor termodinamice si termochimice
  • S-a studiat influenta dimensiunii cristalitelor/grauntilor asupra proprietilor termodinamice de suprafata (energii, entalpii, entropii), ca si asupra entalpiei si temperaturii transformarilor de faza si s-a efectuat studiul corelatiilor dintre proprietatile termodinamice si dimensiunea particulelor
  • Au fost trasate diagramele de echilibru si s-au obtinut concluzii privind optimizarea proprietatilor pe baza factorilor energetici
  • Elaborarea de lucrari stiintifice in tematica proiectului.
  • Conectarea la platforme europene de cercetare
  • Optimizarea sistemului de lucru experimental pe materiale micro si nanostructurate
  • Comunicari aprobate si sustinute la conferinte de specialitate
  • Participarea la realizarea propunerilor de proiecte internationale (includerea in consortii)

 

¨Lucrari publicate si in curs de publicare

  1. Speranta Tanasescu, Maria Nicoleta Grecu, Cornelia Marinescu, Liviu Mihail Giurgiu, Horia Chiriac, Maria Urse, Effects of dopants and oxygen nonstoichiometry on the thermodynamic and magnetic properties of micro- and nanostructured perovskite-type materials, Advances in Applied Ceramics, 108, 5, 273-279 (2009)
  2. S. Tanasescu, C. Marinescu, A. Sofronia, A. Ianculescu, L. Mitoseriu, High temperature thermodynamic data of some multiferroic ceramics based on BiFeO3 – BaTiO3 solidsolutions", Journal of Optoelectronics and Advanced Materials, 11, 8, 1196 -1201 (2009).
  3. D. Berger, C. Matei, G. Voicu, F. Papa, A. Bobaru, V. Fruth, Synthesis of La1-xSrxMO3 (M=Mn, Fe, Co, Ni) nanopowders by alanine-combustion technique, J. Eur. Ceram. Soc. 30, 617-622 (2010).
  4. Speranta Tanasescu, Cornelia Marinescu, Evaluation of manganese and oxygen content in La0.7Sr0.3MnO3-δ and correlation with the thermodynamic data, Journal Solid State Electrochemistry, in press (2010).
  5. R. M. Piticescu, R. Orban, S. Tanasescu, R. Piticescu, V. Badilita, M. Lucaci, Correlations between nanostructure and thermodynamic properties of NiAlMex-alumina composites, Capitol in New applications of micro- and nanotechnologies, Vol. 14, ser “Micro and Nanoeng.”, Ed. Acad Rom, 2009.
  6. C. Marinescu, A. Sofronia, Temperature and heat flow calibration of Differential Scanning Calorimeter (DSC) in the Heating Mode, Rev. Roumaine Chimie, in press
  7. S. Tanasescu, C. Marinescu, A. Sofronia, A. Petcu, F. Teodorescu, Thermodynamic data of some multiferroic ceramics based on BiFeO3-BaTiO3 solid solutions, Proc XI Workshop of APDTC, sept 2009, Ljubliana, Slovenia

B Lucrari comunicate la manifestari stiintifice internationale
1. Cornelia Marinescu, Ancuta Sofronia, Speranta Tanasescu, Adelina Ianculescu, Liliana Mitoseriu, High temperature heat capacity of some multiferroic ceramics based on BiFeO3 – BaTiO3 solid solutions, Prezentare orala la International Conference on Materials Science & Engineering, 26 – 28 February 2009, Brasov, Romania, BRAMAT 2009
2. Ancuta Sofronia, Cornelia Marinescu, Speranta Tanasescu, Adelina Ianculescu, Liliana Mitoseriu, The Fe/Mn ratio influence on the thermodynamic properties of Bi0.9La0.1Fe1-xMnxO3 (x=0-0.5), Prezentare sub forma de poster la International Conference on Materials Science & Engineering, 26 – 28 February 2009, Brasov, Romania, BRAMAT 2009
3. Speranta Tanasescu, Cornelia Marinescu, Anca Sofronia, Florina Teodorescu, Energetic parameters controlling the properties of micro and nanostructured transition metal oxides, ZING Solid State Chemistry Conference”, 25-28 February 2009, Cancun, Mexic
4. Speranta Tanasescu, Cornelia Marinescu, Anca Sofronia, Florina Teodorescu, Alina Petcu, The influence of dopants, oxygen nonstoichiometry and particle size on the thermodynamic data of perovskite-type materials, lucrare invitata la “13th International IUPAC Conference on High Temperature Materials Chemistry”, HTMC-13, September 14-19, 2009 at the University of California, Davis.
5. S. Tanasescu, C. Marinescu, A. Sofronia, A. Ianculescu, L. Mitoseriu, High temperature thermodynamic properties of some multiferroic ceramics based on BiFeO3, A 13-a Conferinta IUPAC privind Chimia Materialelor la temperatura inalta (13th International IUPAC Conference on High Temperature Materials Chemistry), Univ. Davis California, USA.
6. S. Tanasescu, C. Marinescu, A. Sofronia, A. Petcu, F. Teodorescu, Thermodynamic data of some multiferroic ceramics based on BiFeO3-BaTiO3 solid solutions, XI Workshop of APDTC, 18-20 septembrie, Ljubliana, Slovenia
7. Speranta Tanasescu, Cornelia Marinescu, Florina Teodorescu, Anca Sofronia, The Control of the Energetic Parameters: Important Step in Understanding the Stability and Reactivity of the Micro and Nanostructured Materials, 2009 Korea/Romania Joint Workshop: Molecular Science and Engineering, May 6th – 10th, 2009, Keimyung University, Korea
8. Florentina Maxim, Ru Zhong Hou, Aiying Wu, Paula Ferreira, Paula M. Vilarinho, “Piezoresponse and Morphology of Nanoferroelectrics”, PFM4, June 23-27, 2009, Aveiro, Portugal.
9. F. Maxim, P. Ferreira, P.M. Vilarinho, Anne Aimable, Paul Bowen, “Additive Assisted Aqueous and Hydrothermal Synthesis of Barium Titanate Nanoparticles”, VI Jornadas CICECO 2009, 5-6 th March 2009, Aveiro, Portugal.
C.Lucrari prezentate la manifestari stiintifice nationale

Speranta Tanasescu, Cornelia Marinescu, Ancuta Sofronia, Adelina Ianculescu, Liliana Mitoseriu, Effects of composition and particle size on the thermodynamic data: Applications to multi-ferroic materials and phase diagrams investigation, 18th Symposium of Thermal Analysis and Calorimetry - 12 februarie 2009, Academia Romana

D. Conectarea la platforme europene de cercetare
S. Tanasescu, "General Assembly ETP Nanomedicine", Workhop on Drug delivery & Brokerage event, Munster in Germania, 10-12 mai 2009

E. Includerea în teze de doctorat a rezultatelor cercetărilor efectuate.
Tinerii doctoranzi Marinescu Cornelia, Florentina Maxim, Petcu Alina care fac parte din echipa de lucru a proiectului valorifica direct prin programul lor de doctorat rezultatele privind studiul termodinamic al compusilor oxidici investigati. Cornelia Marinescu si-a sustinut teza de doctorat in anul 2009, tema tezei fiind legata direct de cercetarile efectuate in etapele parcurse in cadrul proiectului de fata.

F. Participarea tinerilor cercetatori la cursuri de instruire
1. Doctoranda Alina Petcu a participat in perioada 11-17 iulie 2009 la cursurile “3rd International Summer School on “Nanosciences & Nanotechnologies” (SS-NN09)
organizate in Thessaloniki, Grecia.
2. Doctoranda Florentina Maxim a participat la “One day course on High Resolution Imaging Techniques”, March 28th, 2009, University of Aveiro, DECV, Aveiro, Portugal.

 

 

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