Banca de QUALIFICAÇÃO: JOSÉ REGILMAR TEIXEIRA DA SILVA

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
DISCENTE: JOSÉ REGILMAR TEIXEIRA DA SILVA
DATA: 27/08/2013
HORA: 09:00
LOCAL: Auditorio da Física
TÍTULO:

Desenvolvimento e Caracterização de Nanocompósitos
a base de Polianilina e Celulose Microcristalina como
Plataformas para Ensaios Eletroquímicos

PALAVRAS-CHAVES:

layer-by-layer

polyaniline

microcrystalline cellulose

biosensors

PÁGINAS: 35
GRANDE ÁREA: Ciências Exatas e da Terra
ÁREA: Química
SUBÁREA: Físico-Química
ESPECIALIDADE: Eletroquímica
RESUMO:

 LbL films based on Polyaniline (PANI) have been extensively studied due to the versatility of

application that can be proposed for these systems. In this study, the doping of PANI was

carried from its interaction with microcrystalline cellulose chemically modified with the  

maleic anhydride grouping (Cel-AM). The maleic anhydride arouses interest for its ability to

form complexes with heavy metals. The materials of interest (PANI and Cel-AM) were

fixed together in the form of thin films through the technique Layer-by-layer on the ITO

substrate. For the films formation, the cellulose was dispersed in the solution at a

concentration of PANI 0.01 g mL-1, and parameters such as the number of layers deposited,

the doping process promoted by the Cel-AM on the PANI and the influence of pH of the

electrolytic environment employed were studied during the characterization steps of the

films. The films of PANI (Cel-AM) were characterized by cyclic voltammetry (CV) and

spectroscopy techniques in the visible ultraviolet region (UV-VIS) and in both cases, the

results showed that the presence of AM-Cel in the PANI solution promotes an increase in

conductivity of the polymer up to 6 times. This result was confirmed during the

measurements of UV-VIS by the appearance of the absorption band at 800 nm characteristic

of PANI in its emeraldine salt state. 

MEMBROS DA BANCA:
Presidente - 2549060 - CARLA EIRAS
Interno - 423287 - JOSE RIBEIRO DOS SANTOS JUNIOR
Externo ao Programa - 1057341 - CLEIDE MARIA DA SILVA LEITE
Externo ao Programa - 1718303 - DURCILENE ALVES DA SILVA