• JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
  • JoomlaWorks Simple Image Rotator
 
  Bookmark and Share
 
 
Doctoral Thesis
DOI
https://doi.org/10.11606/T.46.2020.tde-26042022-081608
Document
Author
Full name
Wellington Belarmino Gonçalves
E-mail
Institute/School/College
Knowledge Area
Date of Defense
Published
São Paulo, 2020
Supervisor
Committee
Gruber, Jonas (President)
Maffei, Daniele Fernanda
Marzorati, Liliana
Pereira, Juliano Gonçalves
Title in Portuguese
Desenvolvimento de novos materiais sensitivos a base de compósitos de Fe3O4 para aplicação em sensores de gases e nariz eletrônico
Keywords in Portuguese
Bactérias
Ionogel
Mel
Nariz eletrônico
Parvovirose
Sensores de gás
Abstract in Portuguese
Compósitos a base de ionogel foram preparados a partir dos componentes EMIMDCA, Fe3O4 e gelatina, aplicados como camada sensível em sensores de gases e testados em narizes eletrônicos. A análise dos componentes principais (PCA) mostrou que os narizes exibiram excelente discriminação entre uma variedade de compostos orgânicos voláteis. Diferentes classificadores, como random forest, multilayer perceptron e Knearest neighbor, foram empregados para avaliar a acurácia na previsão dos sensores, obtendo valores acima de 98%. Os narizes eletrônicos formados por esses sensores foram empregados em diferentes aplicações, começando pela diferenciação de mel puro e adulterado, sendo capazes de distingui-los com elevada precisão. O diagnóstico de parvovirose canina também foi estudado, doença com elevada taxa de mortalidade em cães. O diagnóstico da doença foi feito com 100% de acurácia. Estudos com bactérias patogênicas de origem alimentar foram conduzidos. Os sensores foram capazes de diferenciar Salmonela de outras bactérias em diferentes meios de cultura, além de distinguir diferentes espécies de bactérias (Salmonella Typhimurium, Escherichia coli e Pseudomonas fluorescens) inoculadas em diversos tipos de carne. Duas inovações são apresentadas neste trabalho: i) aplicação de diferentes ionogéis produzidos com os mesmos componentes em um nariz eletrônico e ii) aplicação de um nariz eletrônico a base de ionogel em situações reais.
Title in English
Development of new sensitive materials based on Fe3O4 composites for application in gas sensors and in electronic nose
Keywords in English
Bacteria
Electronic nose
Gas sensors
Honey
Ionogel
Parvovirus
Abstract in English
Composites based on ionogel were prepared from the components EMIMDCA, Fe3O4 and gelatin, applied as a sensitive layer in gas sensors, and tested in an electronic nose. Despite the use of only 3 components, two sets with 4 sensors each were developed. Principal component analysis (PCA) showed that the electronic nose exhibited excellent discrimination between a variety of volatile organic compounds. Different classifiers, such as random forest, multilayer perceptron and K-nearest neighbor, were used to evaluate the accuracy in the prediction of the sensors, obtaining values above 98%. The electronic noses were used for different applications starting with the differentiation of pure and adulterated honey, being able to capable distinguish it with high precision. The diagnosis of canine parvovirus was also studied, a disease with a high mortality rate in dogs. The diagnosis of the disease was done with 100% accuracy. Studies with foodborne pathogenic bacteria were conducted, the electronic nose was able to differentiate Salmonella from other bacteria in different culture media, and also to distinguish different bacteria species (Salmonella Typhimurium, Escherichia coli and Pseudomonas fluorescens) inoculated in different types of meat. Two innovations are presented in this work: i) application of different ionogels produced with the same components in an electronic nose and ii) application of an electronic nose based on ionogel in real situations.
 
WARNING - Viewing this document is conditioned on your acceptance of the following terms of use:
This document is only for private use for research and teaching activities. Reproduction for commercial use is forbidden. This rights cover the whole data about this document as well as its contents. Any uses or copies of this document in whole or in part must include the author's name.
Publishing Date
2022-06-07
 
WARNING: Learn what derived works are clicking here.
All rights of the thesis/dissertation are from the authors
CeTI-SC/STI
Digital Library of Theses and Dissertations of USP. Copyright © 2001-2024. All rights reserved.