Funcionalização de tecidos com nanocápsulas e recobrimentos biopoliméricos visando proteção contra mosquitos
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Título principal
Funcionalização de tecidos com nanocápsulas e recobrimentos biopoliméricos visando proteção contra mosquitos [recurso eletrônico] / Quesli Martins ; orientadora, Andrea Cristiane Krause Bierhalz ; coorientadora, Cristiane da Costa
Data de publicação
2024
Descrição física
121 p.
Nota
Disponível somente em versão on-line.
Dissertação (mestrado) – Universidade Federal de Santa Catarina, Centro Tecnológico de Ciências Exatas e Educação. Programa de Pós-Graduação em Engenharia Têxtil, Blumenau, 2024.
Inclui referências.
Funcionalização de tecidos com nanocápsulas e recobrimentos biopoliméricos visando proteção contra mosquitos [recurso eletrônico] / Quesli Martins ; orientadora, Andrea Cristiane Krause Bierhalz ; coorientadora, Cristiane da Costa
Data de publicação
2024
Descrição física
121 p.
Nota
Disponível somente em versão on-line.
Dissertação (mestrado) – Universidade Federal de Santa Catarina, Centro Tecnológico de Ciências Exatas e Educação. Programa de Pós-Graduação em Engenharia Têxtil, Blumenau, 2024.
Inclui referências.
Abstract: Mosquito-borne diseases such as malaria, dengue fever, and Zika pose serious threats to global public health. Textiles functionalized with repellent agents can be used as a strategy to reduce exposure to these. Currently, chemical repellents face toxicity and resistance challenges, increasing the interest in repellents of natural origin. Neem oil (NSO) is safe and has proven insecticidal activity, making it promising for textiles applications. Therefore, this study aimed to develop 100% cotton fabrics functionalized with NSO for application as repellent/insecticide textiles. To improve the durability of the effect, the impregnation of chitosan nanocapsules (CS) with NSO and coating of the fabric with NSO and CS were investigated. To encapsulate of NSO in CS, an ionic gelation technique with crosslinking with sodium tripolyphosphate (TPP) was used. The influence of ultrasonic dispersion time during the preparation of the oil/water nanoemulsion (Step 1) and incorporation of the polymeric solution into the nanoemulsion (Step 2) on the size and stability of the nanocapsules was evaluated. The average hydrodynamic particle size, determined using dynamic light scattering (DLS), was 169 ± 10 nm for sonication times of 9 and 27 min in steps 1 and 2, respectively, with no significant variation after 7 months of storage. The polydispersity index (PDI) of the dispersions was 0.242, indicating moderate polydispersity. Morphological analysis of the nanocapsules indicated a spherical shape and capsular structure. The impregnation of the nanocapsule dispersion and the CS and NSO coating solution into the fabrics was carried out in Foulard, evaluating immersion times of 2, 30, and 60 min. It was observed that increasing the immersion time increased the total color difference and reduced the degree of whiteness of the fabrics, and functionalization with nanocapsules resulted in smaller changes. In vitro, release tests indicated slower kinetics and less oil was released in to fabrics with nanocapsules. The immersion time did not significantly influence the release behavior, however there was a reduction in the amount released in all samples after a washing cycle. FTIR tests confirmed the formation of capsules and their presence in the fabrics, as well as the coating with CS and/or NSO. Based on repellency tests against Aedes aegypti mosquitoes, protection rates of up to 75% were obtained for fabrics covered with CS and NSO solutions and 52% for those impregnated with nanocapsules. Fabrics functionalized with NSO followed by coating with CS and functionalized only with NSO presented rates of 44% and 23%, respectively.and the sample size and number of layers of the fabric influenced the effectiveness of the treatment, in addition to the weight of the fabric. In general, the results indicate that greater availability of active agents obtained by coating with the combined use of CS and NSO contributes to promising results in terms of mosquito repellent functionality.