Banca de DEFESA: ALEXSANDRO RAMOS DOS SANTOS

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : ALEXSANDRO RAMOS DOS SANTOS
DATE: 29/02/2024
TIME: 09:00
LOCAL: Através de Videoconferência: meet.google.com/mfm-ioxu-zbx
TITLE:

ELECTROMAGNETIC INTERFERENCE SHIELDING EFFECTIVENESS OF NANO AND CARBON COMPOUNDS: An analysis of yttrium-Iron garnet, bacterial cellulose, nitrogen-doped reduced graphene oxide and iron and cobalt nanowires

KEY WORDS:

Electromagnetic shielding, microwave, yttrium-iron garnet, bacterial
cellulose, reduced graphene oxide, nanowires.

PAGES: 88
BIG AREA: Ciências Exatas e da Terra
AREA: Física
SUMMARY:

This work aims to present a possible solution to the growing problem of
electromagnetic pollution through the shielding effect against electromagnetic
interference, analyzed in five compounds. The methodology consists of creating a
theoretical introduction to electromagnetic waves, establishing a theoretical
framework for a better understanding of the electromagnetic pollution problem and
the shielding effect against electromagnetic interference. It involves understanding
and citing the devices causing this pollution, preparing samples of yttrium-iron garnet
on alumina membrane using the sol-gel method, bacterial cellulose samples
cultivated in HS medium, reduced graphene oxide samples doped with nitrogen
using the Hummers method, and iron and cobalt nanowires samples with a thin layer
of gold, grown on alumina membrane using the electrodeposition method to serve as
potential solutions to the problem. Finally, a Vector Network Analyzer is used to
measure the shielding obtained from these samples on the microwave band X. It was
then observed an insignificant residual shielding for yttrium-iron garnet, low shielding
in the range of 5.7 dB for bacterial cellulose, and moderate shielding for the other
composites, with nitrogen doped graphene oxide with Fe3O4 having 27.3 dB of
shielding, cobalt nanowires with 17.9 dB, and iron nanowires with 34.0 dB of
shielding.

COMMITTEE MEMBERS:
Interno - 1206583 - ANTONIO AZEVEDO DA COSTA
Presidente - 2457389 - EDUARDO PADRON HERNANDEZ
Externo à Instituição - JOAO MARIA SOARES - UERN