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Project ID_512
Project director: Assist. Prof. dr. Delia-Maria GLIGOR
“Babes-Bolyai” University
PROJECT TITLE: NANOMATERIALS WITH APPLICATIONS IN MEDIATED ELECTROCATALYSIS USING MODIFIED ELECTRODES
Abstract. The most recent efforts to obtain modified electrodes (MEs) which present electrocatalytic activity used new materials as: electropolymerized films, carbon nanotubes and zeolites. Additionally, using of irradiation method of electrode surface with a light source lead to a significant effect of increasing the electrocatalytic efficiency towards NADH oxidation (photoelectrocatalytic oxidation). In this context, for turning account the international collaboration relationship, members from teams with complementary preoccupations propose obtaining of new nanomaterials with improved electrocatalytic properties, using immobilization of some mediators (particularly, phenothiazine derivatives) through different methods: adsorption on electrode material, electropolymerization, adsorption on zeolites, followed by its incorporation in carbon nanotubes/graphite powder or incorporation of natural zeolites with electrocatalytic properties directly in carbon paste. Physical-chemical charact erization of zeolites will follow determination of specific surface, IR spectra, SEM, TEM, etc. and of ionic exchange properties. Obtaining and characterization of MEs and their electrochemical characterization need using of cyclic voltammetry as investigation method of heterogeneous charge transfer kinetic process at electrochemical interface. Electrochemical characterization will suppose study of experimental conditions influence-scan rate, pH, surface coverage-on electrochemical response of obtained MEs. It will be realized a kinetic study of obtained MEs through determination of electrocatalytic rate constant for NADH and H2O2, from measurements of hydrodinamic voltammetry on rotating disk electrode (Koutecky-Levich method). It will be obtained amperometric sensors for NADH (in the absence and in the presence of light radiation) and for H2O2, using amperometry as investigation method. It will model and simulate the mathematical equations used for kinetic parameters deter mination.
Research team

Assist. Prof. dr. Delia-Maria GLIGOR

Assoc. Prof. dr. eng. Sanda Andrada MAICANEANU

Assoc. Prof. dr. Mihaela Ligia UNGURESAn

PhD Student Codruta Mihaela VARODI

PhD Student Izabell CRACIUNESCU

Involvement degree of young researchers

The PhD students obtain and characterize the modified electrodes predicted in realization plan of the project from electrochemical and electrocatalytic point of view, which is in concordance with the research plan proposed for their PhD thesis.

I. PhD Student Codruta Mihaela Varodi

Title of PhD thesis: Composite electrode materials with electrocatalytic properties

Papers:

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, 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.

National patent:

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, Deposed to OSIM and recorded with no. A/00518 from 6.07.2009.

Conferences:

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, Prague, 16 - 19 June 2008 (poster).

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

3. 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 June 2010 (poster).

II. PhD Student Izabell Craciunescu

Title of PhD thesis:Microstructures based on conductor polymers with electrochemical applications

Papers:

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, manuscript, Electroanalysis.

Conferences:

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 May 2009 (poster).

Objectives and activities
1. Testing of some new phenothiazine derivatives for preparation of electrode materials of high complexity, with electrocatalytic activity towards NADH oxidation, using adsorption on graphite or the carbon nanotubes – total realization degree
1.1. Obtaining of modified electrode materials – total realization degree
1.2. Structure - electrochemical properties correlations in obtained electrochemical systems – total realization degree
1.3. Electrochemical stability study of obtained electrode materials – total realization degree
2. Comparatively electrochemical characterization of modified electrode materials – total realization degree
2.1. Influence of different experimental conditions (pH, scan rate) on the electrochemical behavior – total realization degree
2.2. Kinetics of charge transfer through modified electrode materials – total realization degree
2.3. Mathematical modelling and numerical simulation of experimental data for obtaining the kinetic parameters – total realization degree
3. Kinetics of NADH mediated electro-oxidation through modified electrode materials – total realization degree
3.1. Analysis of electrocatalytic and photoelectrocatalytic efficiency from cyclic voltammetric measurements – total realization degree
3.2. Estimation of rate constant for NADH oxidation reaction on the obtained electrode materials, in different experimental conditions, using measurements of hydrodinamic voltammetry with rotating-disk electrode – total realization degree
3.3. Mathematical modelling and numerical simulation of experimental data for obtaining the electrocatalytic parameters – total realization degree
4. Testing of obtained modified electrode materials as amperometric sensors for NADH detection – total realization degree
4.1. Determination of electroanalytic characteristics of amperometric sensors in the absence and in the presence of light radiation – total realization degree
4.2. Determination of kinetic characteristics of amperometric sensors in the absence and in the presence of light radiation – total realization degree
4.3. Mathematical modelling and numerical simulation of experimental data for obtaining the Michaelis-Menten constant, sensitivity and Imax – total realization degree
5. Realization of electrochemical interfaces with electrocatalytic activity towards NADH oxidation, obtained by electropolymerization – total realization degree
5.1. Determination of optimum conditions for electropolymerization – total realization degree
5.2. Obtaining of modified electrochemical interfaces – total realization degree
5.3. Influence of different experimental conditions (pH, scan rate) and evaluation of kinetic parameters characteristic for heterogeneous electron transfer process (rate constant, transfer coefficient, number of electrons) – total realization degree
6. Kinetic study of NADH mediated electro-oxidation in obtained electrochemical interfaces – total realization degree
6.1. Analysis of electrocatalytic and photoelectrocatalytic efficiency from cyclic voltammetric measurements – total realization degree
6.2. Estimation of rate constant for NADH oxidation reaction on the obtained modified electrodes, in different experimental conditions, using measurements of hydrodinamic voltammetry with rotating-disk electrode – total realization degree
6.3. Analogical modelling and numerical simulation of experimental data for obtaining the electrocatalytic parameters – total realization degree
7. Testing of obtained modified electrodes as amperometric sensors for NADH detection – total realization degree
7.1. Determination of electroanalytical characteristics of amperometric sensors – total realization degree
7.2. Determination of kinetic characteristics of amperometric sensors – total realization degree
7.3. Mathematical modelling and numerical simulation of experimental data for obtaining the Michaelis-Menten constant, sensitivity and Imax – total realization degree
8. Physical-chemical characterization of natural zeolites modified with transition metals by ion exchange – total realization degree
8.1. Obtaining of natural zeolites modified with transition metals by ion exchange (static regime, dynamic regime– on column and in reactor with mixing) – total realization degree
8.2. Determination of specific surface (BET method), IR, SEM, TEM spectra and of ionic exchange capacity for different metalic ions – total realization degree
9. Realization and electrochemical characterization of electroactive composite nanostructures of natural zeolites modified with transition metals - carbon nanotubes / carbon paste matrice type – total realization degree
9.1. Obtaining of electroactive composite nanostructures and influence of different experimental conditions (pH, scan rate) and evaluation of kinetic parameters characteristic for heterogeneous electron transfer process (rate constant, transfer coefficient) – total realization degree
9.2. Modelling and numerical simulation of columns and reactors of ionic exchange – total realization degree
10. Kinetics of H2O2 mediated electro-reduction process in electroactive composite nanostructures of natural zeolites modified with transition metals - carbon nanotubes / graphite powder matrice type – total realization degree
10.1. Analysis of electrocatalytic efficiency from cyclic voltammetric measurements – total realization degree
10.2. Estimation of rate constant for H2O2 reduction reaction on the obtained modified electrodes, in different experimental conditions, using measurements of hydrodinamic voltammetry with rotating-disk electrode – total realization degree
10.3. Analogical modeling and numerical simulation of experimental data for obtaining the electrocatalytic parameters – total realization degree
11. Realization, physical-chemical and electrochemical characterization of electroactive composite nanostructures of synthetic zeolites adsorbed with azines - carbon nanotubes / graphite powder matrice type – total realization degree
11.1. Realization of IR, TEM spectra – total realization degree
11.2. Influence of different experimental conditions (pH, scan rate) and evaluation of kinetic parameters characteristic for heterogeneous electron transfer process (rate constant, transfer coefficient) – total realization degree
11.3. Modelling and simulation of mathematical equations used for determination the kinetic parameters of modified electrodes – total realization degree
12. Kinetics of NADH mediated electro-oxidation process in electroactive composite nanostructures of synthetic zeolites adsorbed with azines - carbon nanotubes / graphite powder matrice type –total realization degree
12.1. Analysis of electrocatalytic efficiency from cyclic voltammetric measurements – total realization degree
12.2. Estimation of rate constant for NADH oxidation reaction on the obtained modified electrodes, in different experimental conditions, using measurements of hydrodinamic voltammetry with rotating-disk electrode –total realization degree
12.3. Analogical modeling and numerical simulation of experimental data for obtaining the electrocatalytic parameters – total realization degree

Results

Papers
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 Csöregi, 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, 12 (2009) 233-238, 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) 475-482, 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) in curs de publicare, 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, IEEE Catalog 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

National patent
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, Deposed to OSIM and recorded with no. A/00518 from 6.07.2009.

Conferences
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 May 2008 (poster).
2. Mihaela Ligia Unguresan, Delia Gligor si 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 May 2008 (oral communication presented by 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 May 2008 (oral communication presented by 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, Prague, 16 - 19 June 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, Prague, 16 - 19 June 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, Turkey, 25-27 June 2008 (oral communication presented by 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, Spain, 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 May 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 May 2009 (oral communication presented by 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, Journées d'Electrochimie 2009, Sinaia, 6-10 July 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, Journées d'Electrochimie 2009, Sinaia, 6-10 July 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 (Turkey), 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 May 2010 (oral communication presented by 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 May 2010 (oral communication presented by 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 June 2010 (poster).