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Advisor(s)
Abstract(s)
The introduction of molecules with biological
properties on textile materials is essential for a number of
biotechnological applications. With the purpose of testing
new processes applied to textiles, in this study, we present
the first results on the feasibility of using the Layerby-Layer (LbL) deposition process in natural fibers such as
cotton, with natural polyelectrolytes like chitosan (CH) and
alginic acid sodium salt (ALG), the durability of CH/ALG
multilayer on cotton were evaluated. The increase of negative charges to the substrate cotton was made with NaBr
and TEMPO, to ensure the success of the process of LbL.
Three characterization methods to assess electrostatic LbL
deposition were performed: the contact angle between a
liquid (water) and the sample surface, in order to characterize the wettability of the samples with the different
layers of CH and ALG; dyeing of the CH/ALG assembled
cotton fabric with cationic methylene blue that shows
regular changes in terms of color depth (K/S value), which
indicate that the surface were alternately deposited with
CH and ALG layers and, finally, the analysis by infrared
spectroscopy using Fourier Transform with Attenuated
Total Reflection (ATR-FTIR), to assess the changes in the
interaction between CH and ALG deposited on cotton
samples.
Description
Keywords
Layer-by-layer Contact angle ATR-FTIR Chitosan Alginate