Banca de DEFESA: JEANE CAROLINE DA SILVA MELO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : JEANE CAROLINE DA SILVA MELO
DATE: 21/02/2022
TIME: 14:00
LOCAL: Google Meet
TITLE:

Study of Corrosion in Electrodeposited Metalics Surfaces with Conductive Polymers for Developing Latent Fingerprints.

KEY WORDS:

Conductive polymers, metallic surfaces, corrosion, latent fingerprint.

PAGES: 181
BIG AREA: Ciências Exatas e da Terra
AREA: Química
SUBÁREA: Físico-Química
SUMMARY:

In view of the work already carried out by the research group in the development of new materials and methodologies
for application in forensic chemistry aimed at developing latent fingerprints, this work seeks to integrate the group's
knowledge with a more in-depth study of the corrosion processes that occur on metallic surfaces electrodeposited with
conductive polymers. The electrochemical behavior of these materials will be investigated through the study of corrosion
potentials, Tafel curves and impedance measurements; considering lithium perchlorate electrolyte and the variation in
the aging time of the latent fingerprint. It is intended to evaluate which media favor or disfavor corrosion processes and
what is the relationship between the composition and aging time of the fingerprint in these processes. The study of such
behavior is related to the improvement of the electropolymerization technique applied to the development of latent
fingerprints. In this sense, from the electrochemical tests and the visual physical aspect of the surfaces, it was verified
the existence of oxidation processes occurring on the metallic surfaces through the alteration of the appearance of the
samples due to the formation of corrosion products, proven by the displacements of the corrosion potentials , corrosion
rates, polarization resistance, etc. It was also possible to observe the effect of fingerprint and aging time on the evolution
of these processes, due to the presence of inorganic salts, especially the chloride ions present in these residues. The
electrodeposition of PEDOT resulted in a direction of the oxidation processes to the region between the fingerprint
ridges, resulting in an improvement of the fingerprint visualization and in a residual corrosion in these regions, that also
allows, a enhancement of the visualization of the pattern of the fingerprint ridges.

BANKING MEMBERS:
Presidente - 1543737 - ADRIANA SANTOS RIBEIRO
Externo à Instituição - ANDREA SANTOS LIU
Interno - 1121401 - JOSEALDO TONHOLO
Interno - 2343745 - JULIO COSME SANTOS DA SILVA