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Previous issue date: 2015-02-20 / Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior - CAPES / O avan?o nanotecnol?gico na s?ntese e caracteriza??o de nanopart?culas (NP?s) tem
protagonizado o desenvolvimento de novas tecnologias para diversas aplica??es de materiais
em escala nanom?trica que apresentam propriedades especificas. O desenvolvimento
cient?fico nas ?ltimas d?cadas na ?rea de nanotecnologia tem protagonizado a descoberta de
novos materiais para as mais diversas aplica??es, em ?reas como: biom?dicas, qu?mica,
?ptica, mec?nica e t?xtil. A alta efici?ncia bactericida de nanopart?culas met?licas (Au e Ag),
dentre outros metais ? bastante conhecida, devido a sua capacidade de agir no DNA de
fungos, v?rus e bact?rias, interrompendo o processo de respira??o celular, tornando-os
importantes meios de estudo, al?m de sua capacidade de prote??o UVA e UVB. Este trabalho
tem como objetivo principal a aplica??o de um m?todo inovador na impregna??o de
nanopart?culas de ouro em substrato t?xtil, funcionalizado com quitosana, pelo processo de
tingimento via exaust?o, com controle de temperatura, tempo e velocidade e obten??o de
caracter?sticas antimicrobianas e prote??o UV. Os substratos esgotados com solu??es
coloidais de NPAu?s apresentaram colora??o lil?s e avermelhada (em malha de soja) devido
a sua superf?cie de plasmon no pico em torno de 520-540 nm. As NPAu?s foram sintetizadas
via s?ntese qu?mica, usando o citrato de s?dio como agente redutor e estabilizador. O material
foi previamente cationizado com quitosana, um polieletr?lito natural, com a finalidade de
funcionaliz?-lo para potencializar a adsor??o das NPAu, sendo usadas concentra??es de 5,
7, 10 e 20 % de ligante sobre o peso do material (SPM). Verificou-se tamb?m, atrav?s de um
planejamento experimental 23
, com 3 pontos centrais, qual era o melhor processo de
esgotamento dos substratos, utilizando os fatores: tempo (min.), temperatura (?C) e
concentra??o do coloide (%), tendo como resposta a vari?vel for?a color?stica - K/S (KubelkaMunk)
das fibras. Foram evidenciadas como melhores respostas os par?metros: concentra??o
e temperatura. O substrato com NPAu foi caracterizado por DRX; An?lise t?rmica, via TGA;
microestrutural via MEV/EDS evidenciando as NP na superf?cie do substrato e presen?a de
ouro (Au). Observou-se tamb?m que os substratos funcionalizados com NPAu possuem boa
solidez a lavagem, fator de classifica??o UPF de +50, considerado excelente e propriedade
bactericida de 98,22% para staphylococcus aureus e 96,45% para klebsiella pneumoniae,
comprovando que o tecido multifuncional desenvolvido, possui grande potencial de aplica??o
na ?rea biom?dica / The advancement of nanotechnology in the synthesis and characterisation of nanoparticles
(NP's) has played an important role in the development of new technologies for various
applications of nano-scale materials that have unique properties. The scientific development
in the last decades in the field of nanotechnology has sought ceaselessly, the discovery of new
materials for the most diverse applications, such as biomedical areas, chemical, optical,
mechanical and textiles. The high bactericidal efficiency of metallic nanoparticles (Au and Ag),
among other metals is well known, due to its ability to act in the DNA of fungi, viruses and
bacteria, interrupting the process of cellular respiration, making them important means of
study, in addition to its ability to protect UVA and UVB. The present work has as its main
objective the implementation of an innovative method in the impregnation of nanoparticles of
gold in textile substrate, functionalized with chitosan, by a dyeing process by exhaustion, with
the control of temperature, time and velocity, thus obtaining microbial characteristics and UV
protection. The exhausted substrates with colloidal solutions of NPAu's presented the colours,
lilac and red (soybean knits) due to their surface plasmon peak around 520-540 nm. The
NPAu's were synthesized chemically, using sodium citrate as a reducing agent and stabilizer.
The material was previously cationised with chitosan, a natural polyelectrolyte, with the
purpose of functionalising it to enhance the adsorption of colloid, at concentrations of 5, 7, 10
and 20 % of the bonding agent on the weight of the material (OWM). It was also observed,
through an experimental design 23
, with 3 central points, which was the best process of
exhaustion of the substrates, using the following factors: Time (min.), temperature (OC) and
concentration of the colloid (%), having as a response to variable K/S (ABSORB?NCIA/
Kubelka-Munk) of the fibres. Furthermore, it was evidenced as the best response, the following
parameters: concentration 100%, temperature 70 ?C and time 30 minutes. The substrate with
NPAu was characterised by XRD; thermal analysis using TGA; microstructural study using
SEM/EDS and STEM, thus showing the NP on the surface of the substrate confirming the
presence of the metal. The substrates showed higher washing fastness, antibacterial
properties and UV radiation protection.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/19685 |
| Date | 20 February 2015 |
| Creators | Silva, Iris Oliveira da |
| Contributors | 18222161415, http://lattes.cnpq.br/8553209522282182, N?brega, Andreza Kelly Costa, 02293726436, http://lattes.cnpq.br/9418395015529669, Oliveira, Fernando Ribeiro, 03986506675, http://lattes.cnpq.br/8756490682656905, Nascimento, Jos? Heriberto Oliveira do, 02452573493, http://lattes.cnpq.br/7033735079037677, Ladchumananandasivam, Rasiah |
| Publisher | Universidade Federal do Rio Grande do Norte, P?S-GRADUA??O EM ENGENHARIA MEC?NICA, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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