Banca de DEFESA: WALKER DE LIMA CORDEIRO

Uma banca de DEFESA de DOUTORADO foi cadastrada pelo programa.
STUDENT : WALKER DE LIMA CORDEIRO
DATE: 11/10/2022
TIME: 15:00
LOCAL: Google Meet
TITLE:

GLASS CARBON ELECTRODE MODIFIED WITH IRON NANO PARTICLES, CARBON NANOTUBES AND SILICON OXIDE, USING 3.5 DINITROSALICYLIC ACID (3.5 DNS) AS ELECTROCHEMICAL MEDIATOR FOR ASCORBIC ACID DETECTION.

KEY WORDS:

Chemical Sensors; ascorbic acid; mediators; 3,5 dinitrosalicylic acid

PAGES: 80
BIG AREA: Ciências Exatas e da Terra
AREA: Química
SUMMARY:

The present work describes a new type of modification onto the electrode surface, whith carbontrimethoxysilane (VTMS), multi walled carbon nano tube (WCNT), iron nanoparticles (Fe3O4), silicon dioxide (SIO2) and 3 ,5 dinitrosalicylic acid (DNS) as electrochemical mediator for ascorbic acid detection. The carbon nanotubes were grafted with vinitrimiethoxy silane (VTMS) in dimethylformamide (DMF) and the nanoparticles were synthesized using the sol-gel method with tetraethyl orthosilicate (TEOS) to obtain the silicated iron nanoparticles (Fe3O4@SiO2) . Aminopropyltriemethoxy silane (APTMS) was used for the fixation of the amine group onto the silicated iron nanoparticles,. Then, Fe3O4@SiO2-NH2 microspheres were added to the mixtures. Fe3O4@SiO2-NH2-DNS nanoparticles obtained after synthesis were deposited on the surface of the modified glassy carbon electrode. The first results showed a linear response (L.R) = 291 - 50 µM with sensitivity of 1,5 µA L µmol-1, , r= 0,9955, LOD 15 µM e LOQ de 50 µM

BANKING MEMBERS:
Presidente - 426640 - FABIANE CAXICO DE ABREU GALDINO
Interno - 039.713.224-76 - PHABYANNO RODRIGUES LIMA - CEFET-Al
Interno - 1127609 - DIOGENES MENESES DOS SANTOS
Externa ao Programa - 1247925 - ANIELLE CHRISTINE ALMEIDA SILVA
Externo à Instituição - JOHNNATAN DUARTE DE FREITAS
Externa à Instituição - ANDRESA KATHERINNE ALBUQUERQUE DE ALMEIDA