Silva, Kesia Karina de Oliveira SoutoSilva, Rita Kássia da2020-01-212019-02-27SILVA, Rita Kássia da. Obtenção de sistema micelar do tipo O/A com óleos essenciais aplicados em tecido 100% algodão. 2019. 150f. Dissertação (Mestrado em Engenharia Têxtil) - Centro de Tecnologia, Universidade Federal do Rio Grande do Norte, Natal, 2019.https://repositorio.ufrn.br/jspui/handle/123456789/28333Essential oils (OEs) are natural products that have a scope in their applications, encompassing different areas of activity. Due to their properties, essential oils can have different functions, such as repellency, analgesic, antimicrobial, antiparasitic, antirheumatic, anti-inflammatory, moisturizing and therapeutic actions. Chitosan (QTS) as a biopolymer of great diversity has effective properties with antimicrobial activity and chelating action for surface modifications of textile substrates. This is due to the presence of amine groups in their chemical structure, which when acetylated at pH acids become positively charged, giving rise to its chelating action and its potential use as a surface modifier. The objective of this work was to obtain ternary micellar systems to define an ideal concentration of the desired formulations, using chitosan as aqueous phase (FA), a nonionic surfactant (T80) and mixing of two essential oils as an oil phase (FO). For the characterization of the essential oils of Andiroba (OEA) and Capim limão (OCL) were verified their density, molecular weight and their indexes, acidity, saponification, iodine, peroxidase and refraction, as well as the presence of antimicrobial activity. Micellar systems were characterized by analysis of pH, electrical conductivity, viscosity, zeta potential, DLS, temperature resistance and microbial activity. Micellar systems (SMs) used in the functionalization of 100% cotton fabric by the layer-by-layer method with the purpose of promoting specific functionalities to the textile materials. Functionalized fabrics were characterized by XRD, FTIR and microbial activity to confirm their surface modification and the presence of the characteristic groups of SM forming components as well as their efficient inhibition of Staphylococcus aureus, Escherichia coli and Enterobacter sp bacteria before and after test of solidity to the washing, proving the permanence, durability and microbial combat of the finishings with the SMs.Acesso AbertoQuitosanaÓleo essencialSubstrato têxtilAntimicrobianoSistema micelaresmasterThesisCNPQ::ENGENHARIAS