Interações interfaciais em filmes automontados de quitosana e clorofila

• Ano de defesa: 2025
• Autor(a) principal: Correia, Sara Cristina Bernardes
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de Mato Grosso; Brasil; Instituto de Ciências Exatas e da Terra (ICET) – Araguaia; UFMT CUA - Araguaia; Programa de Pós-Graduação em Ciência de Materiais
• Palavras-chave em Português: Filmes layer-by-layer; Sensores; Johnson-Mehl-Avrami; CNPQ::CIENCIAS EXATAS E DA TERRA; Layer-by-layer films; Sensors
• Link de acesso: http://ri.ufmt.br/handle/1/7213

The search for sustainable, biodegradable, and low-cost materials has been one of the focuses of materials science and technology. In this work, chitosan (CS) and chlorophyll (CHL), materials found in abundance in nature, which are non-toxic and low-cost, were used to develop nanostructured films using the Layer-by-Layer (LbL) technique. For this purpose, the molecular aggregation phenomenon of the CS/CHL system and its dependence on film preparation conditions were investigated, when parameters such as solution concentration and deposition time are changed. The construction of the films was monitored by UV-Vis spectroscopy and atomic force microscopy. Through the experimental data and application of theoretical modeling, it was possible to infer the time of layer deposition, concentration and sequence of film assembly. It was verified that the best conditions are achieved for solutions with a concentration of 0.5gL⁻¹, without rinsing between layers and with 10 min of deposition for the CHL solution. This sequence produces more homogeneous films with linear growth and can help elucidate the mechanism of interaction between Chlorophyll-Chitosan to form LbL films that can be used as sensory platforms.