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Proiect ID_512
Director proiect: Lect. dr. Delia-Maria GLIGOR
Universitatea"Babes-Bolyai"
TITLU PROIECT: NANOMATERIALE CU APLICATII IN ELECTROCATALIZA MEDIATA PE ELECTROZI MODIFICATI
Rezumat. Cele mai recente eforturi de obtinere a electrozilor modificati (EM) care prezinta activitate electrocatalitica au utilizat materiale noi ca: filme electropolimerizate, nanotuburi de carbon si zeoliti. In plus, utilizarea metodei de iradiere a suprafetei electrodului cu o sursa de lumina a condus la un efect semnificativ de crestere a eficientei electrocatalitice fata de oxidarea NADH (oxidare fotoelectrochimica). In acest context, pentru valorificarea relatiilor de colaborare internationala, membrii din colective cu preocupari complementare isi propun obtinerea de noi nanomateriale cu proprietati electrocatalitice imbunatatite, folosind imobilizarea unor mediatori (in special, derivati fenotiazinici) prin diferite metode: adsorbtie pe materialul de electrod, electropolimerizare, adsorbtie pe zeoliti, urmata de incorporarea in nanotuburi de carbon/grafit pulbere sau inglobarea zeolitilor naturali cu proprietati electrocatalitice direct in pasta de carbune. Caracterizarea fizi co-chimica a zeolitilor va urmari determinarea suprafetei specifice, spectre IR, SEM, TEM, etc. si a proprietatilor de schimb ionic. Obtinerea EM si caracterizarea electrochimica a acestora necesita utilizarea voltametriei ciclice ca metoda de investigare a cineticii procesului de transfer eterogen de sarcina la interfata electrochimica. Caracterizarea electrochimica presupune studiul influentei diferitelor conditii experimentale-viteza de baleiaj, pH, grad de acoperire-asupra raspunsului electrochimic al EM obtinuti. Se va efectua un studiu cinetic al EM obtinuti, prin determinarea constantei de viteza electrocatalitice pentru NADH si H2O2, din masuratori de voltametrie hidrodinamica pe electrodul disc rotitor (metoda Koutecky-Levich). Se vor obtine senzori amperometrici pentru detectia NADH (in absenta si in prezenta radiatiei luminoase) si a H2O2, utilizand amperometria ca metoda de investigare. Se vor modela si simula ecuatiile matematice utilizate in calculul parametril or cinetici.
Echipa de cercetare

Lect. dr. Delia-Maria GLIGOR

Conf. dr. ing. Sanda Andrada MAICANEANU

Conf. dr. Mihaela Ligia UNGURESAN

Drd. Codruta Mihaela VARODI

Drd. Izabell CRACIUNESCU

Gradul de implicare al tinerilor cercetatori

Doctoranzii obtin si caracterizeaza electrozii modificati prevazuti in planul de realizare al proiectului din punct de vedere electrochimic si electrocatalitic, ceea ce este in concordanta cu directia de cercetare propusa pentru tezele lor de doctorat.

I. Drd. Codruta Mihaela Varodi

Titlul tezei de doctorat: Materiale de electrod compozite cu proprietati electrocatalitice

Articole:

1. Delia Gligor, Codruta Varodi, Liana Muresan, Immobilization of Carbon Nanotubes onto a Graphite Electrode Modified with a New Phenothiazine Derivative: Towards Improved Performances for NADH Electrocatalytic Oxidation, Chemical and Biochemical Engineering Quarterly Q, 24(4) (2010) 59-66

2. Codruta Varodi, Delia Gligor, Levente Abodi, Liana Muresan, Comparative study of carbon paste electrodes modified with Methylene Blue and Methylene Green adsorbed on zeolite as amperometric sensors for H2O2 detection, Studia Universitas Babes-Bolyai, Chemia, 3 (2009) 255-263

3. Delia Gligor, Codruta Varodi, Andrada Maicaneanu, Liana Maria Muresan, Carbon nanotubes-graphite paste electrode modified with Cu(II)-exchanged zeolite for H2O2 detection, Studia Universitas Babes-Bolyai, Chemia, XLV, 2, TOM II (2010) 293-302.

Cerere de brevet national depusa:

1. Delia Gligor, Codruta Varodi, Andrada Maicaneanu, Liana Muresan, Procedeu de realizare a unui senzor amperometric pentru detectia apei oxigenate, pe baza de electrod pasta de carbune modificat cu un zeolit natural imbogatit cu cupru, Cerere depusa la OSIM si inregistrata cu nr. A/00518 din 6.07.2009

Comunicari:

1. Codruta Varodi, Delia Gligor, Andrada Maicaneanu, Liana Muresan, Amperometric detection of NADH with carbon paste electrode incorporating calcium-exchanged zeolite and Methylene Blue, The 12th International Conference on Electroanalysis, ESEAC, Praga, Cehia, 16 - 19 iunie 2008 (poster).

2. D. Gligor, C. Varodi, L. Muresan, Chemical adsorption of a phenothiazine derivative onto carbon nanotubes: towards improved performances for NADH electrocatalytic oxidation, Journιes d'electrochimie 2009, 6-10 iulie 2009, Sinaia (poster).

3. C. Varodi, Andrada Maicaneanu, Liana M. Muresan, Delia Gligor, Cu-exchanged zeolite incorporated in carbon nanotubes paste electrode for hydrogen peroxide determination, Analytical and Nanoanalytical Methods for Biomedical and Environmental Sciences "IC-ANMBES-2010" Brasov, 18-20 iunie 2010 (poster).

II. Drd. Izabell Craciunescu

Titlul tezei de doctorat: Microstructuri pe baza de polimeri conductori cu aplicatii electrochimice

Articole:

1. Delia Gligor, Izabell Craciunescu, Ionel Catalin Popescu, Lo Gorton, Influence of the electrode material on the electrochemical behavior of carbon paste electrodes modified with Meldola Blue and Methylene Green adsorbed on a synthetic zeolite, Electroanalysis, 22(5) (2010) 509-512.

2. Delia Gligor, Izabell Craciunescu, Ionel Catalin Popescu, Lo Gorton, Influence of SWCNT on NADH Oxidation at Carbon Paste Electrodes Modified with Meldola Blue and Methylene Green Adsorbed on Synthetic Zeolite manuscris, Electroanalysis.

Comunicari:

1. Delia Maria Gligor, Izabell Craciunescu, Ionel Catalin Popescu, Lo Gorton, Electrochemical behavior of carbon nanotubes paste electrodes modified with Methylene Green and Meldola Blue adsorbed on a synthetic zeolite, XXth International Symposium on Bioelectrochemistry and Bioenergetics, Sibiu, 10-14 mai 2009 (poster).

Obiective si activitati
1. Testarea unor noi derivati fenotiazinici pentru prepararea de materiale de electrod de inalta complexitate cu activitate electrocatalitica fata de oxidarea NADH, folosind adsorbtia pe grafit sau nanotuburile de carbon-grad de realizare total
1.1. Obtinerea materialelor de electrod modificate – grad de realizare total
1.2. Corelatii structura-proprietati electrochimice in sistemele electrochimice obtinute – grad de realizare total
1.3. Studiul stabilitatii electrochimice a materialelor de electrod obtinute – grad de realizare total
2. Caracterizarea electrochimica comparativa a materialelor de electrod modificate-grad de realizare total
2.1. Influenta diferitelor conditii experimentale (pH, viteza de baleiaj) asupra comportamentului electrochimic – grad de realizare total
2.2. Cinetica transferului de sarcina prin materialele de electrod modificate – grad de realizare total
2.3. Modelarea matematica si simularea numerica a datelor experimentale pentru obtinerea parametrilor cinetici – grad de realizare total
3. Cinetica procesului electro-oxidarii mediate a NADH prin materialele de electrod modificate.-grad de realizare total
3.1. Evidentierea eficientei electrocatalitice si fotoelectrocatalitice din masuratori de voltametrie ciclica – grad de realizare total
3.2. Estimarea constantei de viteza a reactiei de oxidare a NADH pe materialele de electrod obtinute, in diferite conditii experimentale, utilizand masuratori de voltametrie hidrodinamica cu electrodul disc-rotitor – grad de realizare total
3.3. Modelarea matematica si simularea numerica a datelor experimentale penrtu obtinerea parametrilor electrocatalitici – grad de realizare total
4. Testarea materialelor de electrod modificate obtinute ca senzori amperometrici pentru detectia NADH-grad de realizare total
4.1. Determinarea caracteristicilor electroanalitice ale senzorilor amperometrici in absenta si in prezenta radiatiei luminoase – grad de realizare total
4.2. Determinarea caracteristicilor cinetice ale senzorilor amperometrici in absenta si in prezenta radiatiei luminoase – grad de realizare total
4.3. Modelarea matematica si simularea numerica a datelor experimentale pentru obtinerea constantei Michaelis-Menten, sensibilitatii si Imax – grad de realizare total
5. Realizarea de interfete electrochimice cu activitate electrocatalitica fata de oxidarea NADH, obtinute prin electropolimerizare-grad de realizare total
5.1. Determinarea conditiilor optime pentru electropolimerizare – grad de realizare total
5.2. Obtinerea interfetelor electrochimice modificate – grad de realizare total
5.3. Influenta diferitelor conditii experimentale (pH, viteza de baleiaj) si evaluarea parametrilor cinetici caracteristici procesului de transfer eterogen de electroni (constanta de viteza, coeficient de transfer, numar de electroni implicati) – grad de realizare total
6. Studiul cinetic al electro-oxidarii mediate a NADH in interfetele electrochimice obtinute-grad de realizare total
6.1. Evidentierea eficientei electrocatalitice si fotoelectrocatalitice din masuratori de voltametrie ciclica – grad de realizare total
6.2. Estimarea constantei de viteza a reactiei de oxidare a NADH pe electrozii modificati obtinuti, in diferite conditii experimentale, utilizand masuratori de voltametrie hidrodinamica cu electrodul disc-rotitor – grad de realizare total
6.3. Modelarea analogica si simularea numerica a datelor experimentale pentru obtinerea parametrilor electrocatalitici – grad de realizare total
7. Testarea electrozilor modificati obtinuti ca senzori amperometrici pentru detectia NADH-grad de realizare total
7.1. Determinarea caracteristicilor electroanalitice ale senzorilor amperometrici – grad de realizare total
7.2. Determinarea caracteristicilor cinetice ale senzorilor amperometrici – grad de realizare total
7.3. Modelarea matematica si simularea numerica a datelor experimentale pentru obtinerea constantei Michaelis-Menten, sensibilitatii si Imax – grad de realizare total
8. Caracterizarea fizico-chimica a zeolitilor naturali modificati cu metale tranzitionale prin schimb ionic-grad de realizare total
8.1. Obtinerea zeolitilor naturali modificati cu metale tranzitionale prin schimb ionic (regim static, regim dinamic – pe coloana si in reactor cu amestecare) – grad de realizare total
8.2. Determinarea suprafetei specifice (metoda BET), spectre IR, SEM, TEM, si a capacitatii de schimb ionic pentru diferiti ioni metalici – grad de realizare total
9. Realizarea si caracterizarea electrochimica de nanostructuri compozite electroactive de tipul matrici zeolitice naturale modificate cu metale tranzitionale - nanotuburi de carbon / grafit pulbere-grad de realizare total
9.1. Obtinerea nanostructurilor compozite electroactive si influenta diferitelor conditii experimentale (pH, viteza de baleiaj) si evaluarea parametrilor cinetici caracteristici procesului de transfer eterogen de electroni (constanta de viteza, coeficient de transfer) – grad de realizare total
9.2. Modelarea si simularea numerica a coloanelor si a reactoarelor de schimb ionic – grad de realizare total
10. Cinetica procesului electro-reducerii mediate a H2O2 prin nanostructuri compozite electroactive de tipul matrici zeolitice naturale modificate cu metale tranzitionale - nanotuburi de carbon / grafit pulbere-grad de realizare total
10.1. Evidentierea eficientei electrocatalitice din masuratori de voltametrie ciclica – grad de realizare total
10.2. Estimarea constantei de viteza a reactiei de reducere a H2O2 pe electrozii modificati obtinuti, in diferite conditii experimentale, utilizand masuratori de voltametrie hidrodinamica cu electrodul disc-rotitor – grad de realizare total
10.3. Modelarea analogica si simularea numerica a datelor experimentale pentru obtinerea parametrilor electrocatalitici – grad de realizare total
11. Realizarea, caracterizarea fizico-chimica si electrochimica de nanostructuri compozite electroactive de tipul matrici zeolitice sintetice adsorbite cu azine - nanotuburi de carbon / grafit pulbere-grad de realizare total
11.1. Realizarea de spectre IR, TEM – grad de realizare total
11.2. Influenta diferitelor conditii experimentale (pH, viteza de baleiaj) si evaluarea parametrilor cinetici caracteristici procesului de transfer eterogen de electroni (constanta de viteza, coeficient de transfer) – grad de realizare total
11.3. Modelarea si simularea ecuatiilor matematice utilizate pentru determinarea parametrilor cinetici ai electrozilor modificati – grad de realizare total
12. Cinetica procesului electro-oxidarii mediate a NADH prin nanostructuri compozite electroactive de tipul matrici zeolitice sintetice adsorbite cu azine - nanotuburi de carbon / grafit pulbere-grad de realizare total
12.1. Evidentierea eficientei electrocatalitice din masuratori de voltametrie ciclica – grad de realizare total
12.2. Estimarea constantei de viteza a reactiei de oxidare a NADH pe electrozii modificati obtinuti, in diferite conditii experimentale, utilizand masuratori de voltametrie hidrodinamica cu electrodul disc-rotitor – grad de realizare total
12.3. Modelarea analogica si simularea numerica a datelor experimentale pentru obtinerea parametrilor electrocatalitici – grad de realizare total

Rezultate

Articole
1. Mihaela Ligia Unguresan, Delia Gligor, Francisc Dulf, Numerical Modelling and Simulation of Laviron treatment for some phenothiazine modified graphite electrodes, Proceeding ISI, IEEE Catalog Number: CFP08AQT-PRT, Mediamira Publishing House, ISBN 978-1-4244-2576-1, 16 (2008) 235-237, http://ieeexplore.ieee.org/search/freesearchresult.jsp?newsearch=true&queryText=Unguresan&x=32&y=20
2. Delia Gligor, Mihaela Ligia Unguresan, Francisc Dulf, Systemic Approach for Numerical Modelling and Simulation of Koutecky-Levich equation for NADH electrocatalytic oxidation at graphite electrodes modified with a new polymeric phenothiazine, Proceeding ISI, IEEE Catalog Number: CFP08AQT-PRT, Mediamira Publishing House, ISBN 978-1-4244-2576-1, 16 (2008) 238-241, http://ieeexplore.ieee.org/search/freesearchresult.jsp?newsearch=true&queryText=Unguresan&x=32&y=20
3. Delia Gligor, Liana Muresan, Ionel Catalin Popescu, Castelia Cristea, Gabriela Cormos, Synthesis and electrochemical behaviour of bis-(10-ethylphenothiazinyl)-phenylmethane, Studia Universitas Babes-Bolyai, Chemia, LIII, 1, (2008), 15-21, http://chem.ubbcluj.ro/~studiachemia
4. Delia Gligor, Elisabeth Csφregi, Ionel Catalin Popescu, Amperometric biosensor for ethanol based on a phenothiazine derivative modified carbon paste electrode, Studia Universitas Babes-Bolyai, Chemia, LIII, 1, (2008), 55-62, http://chem.ubbcluj.ro/~studiachemia
5. Delia Gligor, Yusuf Dilgin, Ionel Catalin Popescu, Lo Gorton, Photoelectrocatalytic oxidation of NADH at graphite electrode modified with a new polymeric phenotiazine, Electroanalysis, 21 (2009) 360-367, http://www3.interscience.wiley.com/journal/26571/toc
6. Delia Gligor, Yusuf Dilgin, Ionel Catalin Popescu, Lo Gorton, Poly-phenothiazine derivative-modified glassy carbon electrode for NADH electrocatalytic oxidation, Electrochimica Acta, 54 (2009) 3124–3128, http://www.elsevier.com/wps/find/journaldescription.cws_home/205/description#description
7. C. Cristea, G. Cormos, D. Gligor, I. Filip, L. Muresan, I. C. Popescu, Electrochemical characterization of bis-(10Hphenothiazin-3-yl)-methane derivatives obtained by microwave assisted organic synthesis, Journal of New Materials for Electrochemical Systems, in curs de publicare, (2009), http://www.polymtl.ca/newmaterials/eng/index.html
8. Mihaela Ligia Unguresan, Delia Maria Gligor, Numerical Modelling and Simulation of Koutecky-Levich equation for NADH electrocatalytic oxidation at graphite electrodes modified with a polymeric phenothiazine, Indian Journal of Chemistry, 48A (2009) 206-210, http://www.niscair.res.in/ScienceCommunication/ResearchJournals/rejour/ijca/ijca0.asp
9. Mihaela Ligia Unguresan, Delia Maria Gligor, Comparison between the experimentally and numerically modelled and simulated kinetic parameters corresponding to Michaelis - Menten equation, for NADH sensors based on polymeric phenothiazine modified electrodes, Asian Journal of Chemistry, 22(1) (2010) http://www.asianjournalofchemistry.co.in/index.aspx
10. Delia Gligor, Codruta Varodi, Liana Muresan, Immobilization of Carbon Nanotubes onto a Graphite Electrode Modified with a New Phenothiazine Derivative: Towards Improved Performances for NADH Electrocatalytic Oxidation, Chemical and Biochemical Engineering Quarterly Q, 24(4) (2010) 59-66, http://hrcak.srce.hr/cabeq?lang=en
11. Alexia Bonnifet, Delia Gligor, Castelia Cristea, Liana M. Muresan, Electrochemical behavior and applications of phenothiazine derivatives based on bis-(10Hphenothiazin-3-yl)-methane, Studia Universitas Babes-Bolyai, Chemia, 1 (2009) 243-251, http://chem.ubbcluj.ro/~studiachemia
12. Codruta Varodi, Delia Gligor, Levente Abodi, Liana Muresan, Comparative study of carbon paste electrodes modified with Methylene Blue and Methylene Green adsorbed on zeolite as amperometric sensors for H2O2 detection, Studia Universitas Babes-Bolyai, Chemia, 3 (2009) 255-263, , http://chem.ubbcluj.ro/~studiachemia
13. Mihaela Ligia Unguresan, Delia Maria Gligor, Francisc Dulf, Iulian O. Maga, Tiberiu Colosi, Mihail Abrudean, Theoretical Preliminaries Associated to Analogical Modelling and Numerical Simulation of the Adsorption Process for Poly-phenothiazine Formaldehyde on Graphite Electrodes, Proceedings CSCS-17, 17th International Conference on Control Systems and Computer Science, Buchares, 26-29 May 2009, Editura Politehnica Press, 2 (2009) 27-32, https://cscs17.ncit.pub.ro
14. Mihaela Ligia Unguresan, Delia Maria Gligor, Francisc Dulf, Tiberiu Colosi, Analogical Modelling and Numerical Simulation of the Adsorption Process for Poly-phenothiazine Formaldehyde on Graphite Electrodes, International Journal of Chemical Reactor Engineering, 7 (2009) A91 1-11, http://www.bepress.com/ijcre
15. Delia Maria Gligor, Mihaela Ligia Unguresan, Numerical Modelling and Simulation of Laviron Treatment for Poly-Phenothiazine Derivative-Modified Glassy Carbon Electrodes, Journal of Mathematical Chemistry, 47(4) (2010) 1476-1482, http://www.springerlink.com/content/101749
16. Delia Gligor, Izabell Craciunescu, Ionel Catalin Popescu, Lo Gorton, Influence of the electrode material on the electrochemical behavior of carbon paste electrodes modified with Meldola Blue and Methylene Green adsorbed on a synthetic zeolite, Electroanalysis, 22(5) (2010) 509-512, http://www3.interscience.wiley.com/journal/26571/toc
17. Delia Gligor, Andrada Maicaneanu, Alain Walcarius, Iron-enriched natural zeolite modified carbon paste electrode for H2O2 detection, Electrochimica Acta, 55 (2010) 4050–4056, http://www.elsevier.com/wps/find/journaldescription.cws_home/205/description#description
18. Mihaela-Ligia Unguresan, Delia-Maria Gligor, Effect of light irradiation and immobilization of carbon nanotubes on kinetic parameters corresponding to Michaelis - Menten equation, for NADH sensors based on phenothiazine graphite modified electrodes, Proceeding ISI, IEEECatalog Number: CFP010AQT-PRT, Mediamira Publishing House, (2010), 429-434, http://ieeexplore.ieee.org/search/freesearchresult.jsp?newsearch=true&queryText=Gligor+D
19. Mihaela Ligia Unguresan, Francisc-Vasile Dulf, Andrada Maicaneanu, Delia-Maria Gligor, Iron Exchange on Natural Zeolites. Comparison of Linear and Non-linear Regresion Analysis Methods, Proceeding ISI, IEEE Catalog Number: CFP010AQT-PRT, Mediamira Publishing House, (2010) 435-438, http://ieeexplore.ieee.org/search/freesearchresult.jsp?newsearch=true&queryText=Gligor+D
20. Delia Gligor, Codruta Varodi, Andrada Maicaneanu, Liana Maria Muresan, Carbon nanotubes-graphite paste electrode modified with Cu(II)-exchanged zeolite for H2O2 detection, Studia Universitas Babes-Bolyai, Chemia, XLV, 2, TOM II (2010) 293-302, http://chem.ubbcluj.ro/~studiachemia

Cerere de brevet national depusa
1. Delia Gligor, Codruta Varodi, Andrada Maicaneanu, Liana Muresan, Procedeu de realizare a unui senzor amperometric pentru detectia apei oxigenate, pe baza de electrod pasta de carbune modificat cu un zeolit natural imbogatit cu cupru, Cerere depusa la OSIM si inregistrata cu nr. A/00518 from 6.07.2009.

Comunicari
1. Delia Gligor, Castelia Cristea, Gabriela Cormos, Liana Muresan, Ionel Catalin Popescu, Structure-electrochemical properties correlations for bis-(10H phenothiazin-3-yl)-methane derivatives, First Regional Symposium on Electrochemistry of South-East Europe, Crveni Otok, Rovinj, Istria, Croatia, 4-8 mai 2008 (poster).
2. Mihaela Ligia Unguresan, Delia Gligor, Francisc Dulf, Numerical Modelling and Simulation of Laviron treatment for some phenothiazine modified graphite electrodes, 2008 IEEE-TTTC International Conference on Automation, Quality and Testing, Robotics, AQTR 2008 (THETA 16), 22-25 mai 2008 (comunicare orala sustinuta de M. Unguresan).
3. Delia Gligor, Mihaela Ligia Unguresan, Francisc Dulf, Systemic Approach for Numerical Modelling and Simulation of Koutecky-Levich equation for NADH electrocatalytic oxidation at graphite electrodes modified with a new polymeric phenothiazine, 2008 IEEE-TTTC International Conference on Automation, Quality and Testing, Robotics, AQTR 2008 (THETA 16), 22-25 mai 2008 (comunicare orala sustinuta de M. Unguresan).
4. Delia Gligor, Yusuf Dilgin, Ionel Catalin Popescu, Lo Gorton, A new polymeric phenothiazine compound for electrocatalytic oxidation of NADH, The 12th International Conference on Electroanalysis, ESEAC, Praga, Cehia, 16 - 19 iunie 2008 (poster).
5. Codruta Varodi, Delia Gligor, Andrada Maicaneanu, Liana Muresan, Amperometric detection of NADH with carbon paste electrode incorporating calcium-exchanged zeolite and Methylene Blue, The 12th International Conference on Electroanalysis, ESEAC, Praga, Cehia, 16 - 19 iunie 2008 (poster).
6. Yusuf Dilgin, Didem Giray, Delia Gligor, Lo Gorton, Photoelectrocatalytic oxidation of NADH on modified electrodes, The 4th National Congress of Analytical Chemistry, Elazig, Turcia, 25-27 iunie 2008 (comunicare orala sustinuta de Y. Dilgin).
7. Delia Gligor, Yusuf Dilgin, Ionel Catalin Popescu, Lo Gorton, Electrocatalytic Detection of NADH Using Glassy Carbon Electrodes Modified With a New Poly-Phenothiazine Derivative, The 59th Meeting of ISE, Seville, Spania, 7-12 sept. 2008 (poster).
8. M. Baia, D. Gligor, L. Baia, F. Toderas, I. C. Popescu, S. Astilean, Adsorption study of 16H, 18H-dibenzo[c,1]-7,9-dithia-16,18-diazapentacene on different gold substrates, Advanced Spectroscopies on Biomedical and Nanostructured Systems, NANOSPEC, Cluj-Napoca, 7-10 sept. 2008 (poster).
9. Delia Maria Gligor, Izabell Craciunescu, Ionel Catalin Popescu, Lo Gorton, Electrochemical behavior of carbon nanotubes paste electrodes modified with Methylene Green and Meldola Blue adsorbed on a synthetic zeolite, XXth International Symposium on Bioelectrochemistry and Bioenergetics, Sibiu, 10-14 mai 2009 (poster).
10. Mihaela Ligia Unguresan, Delia Maria Gligor, Francisc Dulf, Iulian O. Maga, Tiberiu Colosi, Mihail Abrudean, Theoretical Preliminaries Associated to Analogical Modelling and Numerical Simulation of the Adsorption Process for Poly-phenothiazine Formaldehyde on Graphite Electrodes, 17th International Conference on Control Systems and Computer Science, Bucure?ti, 26-29 mai 2009, (comunicare orala sustinuta de M. Unguresan).
11. Delia Gligor, Andrada Maicaneanu, Silvia Burca, Alain Walcarius, Amperometric sensor for hydrogen peroxide based on solid carbon paste electrode modified with an iron-rich natural zeolite, Journιes d'Electrochimie 2009, Sinaia, 6-10 iulie 2009 (poster).
12. Delia Gligor, Codruta Varodi, Liana Muresan, Chemical adsorption of a phenothiazine derivative onto carbon nanotubes: towards improved performances for NADH electrocatalytic oxidation, Journιes d'Electrochimie 2009, Sinaia, 6-10 iulie 2009 (poster).
13. Mihaela-Ligia Unguresan, Andrada Maicaneanu, Delia Gligor, Eva-Henrietta Dulf, Maria Stanca, Silvia Burca, Horea Bedelean, Francisc-Vasile Dulf, Experimental study and modelling of iron and copper adsorption on natural zeolites, 5th Black Sea Basin Conference on Analytical Chemistry, Fatsa (Turcia), 23-26 sept. 2009 (poster).
14. Mihaela Ligia Unguresan, Delia-Maria Gligor, Effect of light irradiation and immobilization of carbon nanotubes on kinetic parameters corresponding to Michaelis - Menten equation, for NADH sensors based on phenothiazine graphite modified electrodes, 2010 IEEE-TTTC International Conference on Automation, Quality and Testing, Robotics, AQTR 2010 (THETA 17), 28-30 mai 2010 (comunicare orala sustinuta de M. Unguresan).
15. Mihaela Ligia Unguresan, Francisc-Vasile Dulf, Andrada Maicaneanu, Delia-Maria Gligor, Iron Exchange on Natural Zeolites. Comparison of Linear and Non-linear Regresion Analysis Methods, 2010 IEEE-TTTC International Conference on Automation, Quality and Testing, Robotics, AQTR 2010 (THETA 17), 28-30 mai 2010 (comunicare orala sustinuta de M. Unguresan).
16. Codruta Varodi, Andrada Maicaneanu, Liana M. Muresan, Delia Gligor, Cu-exchanged zeolite incorporated in carbon nanotubes paste electrode for hydrogen peroxide determination, Analytical and Nanoanalytical Methods for Biomedical and Environmental Sciences "IC-ANMBES-2010" Brasov, 18-20 iunie 2010 (poster).