Investigation of the Internal Chemical Composition of Chitosan-Based LbL Films by Depth-Profiling X-ray Photoelectron Spectroscopy (XPS) Analysis

Autor(es)

Taketa, Thiago B. ^[1] ; dos Santos, Danilo M. ^[2] ; Fiamingo, Anderson ^[2] ; Vaz, Juliana M. ^[1] ; Beppu, Marisa M. ^[1] ; Campana-Filho, Sergio P. ^[2] ; Cohen, Robert E. ^[3] ; Rubner, Michael F. ^[4]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Sch Chem Engn, BR-13083852 Campinas, SP - Brazil

^[2] Univ Sao Paulo, Sao Carlos Inst Chem, BR-13010111 Sao Paulo, SP - Brazil

^[3] MIT, Dept Mat Sci & Engn, Cambridge, MA 02139 - USA

^[4] MIT, Dept Chem Engn, Cambridge, MA 02139 - USA

• Tipo de documento: Artigo Científico
• Fonte: Langmuir; v. 34, n. 4, p. 1429-1440, JAN 30 2018.
• Citações Web of Science: 5

Resumo

Chitosan-based thin films were assembled using the layer-by-layer technique, and the axial composition was accessed using X-ray photoelectron spectroscopy with depth profiling. Chitosan (CHI) samples possessing different degrees of acetylation ((DA) over bar) and molecular weight ((M-v) over bar) produced via the ultrasound-assisted deacetylation reaction were used in this study along with two different polyanions, namely, sodium polystyrenesulfonate (PSS) and carboxymethylcellulose (CMC). When chitosan, a positively charged polymer in aqueous acid medium, was combined with a strong polyanion (PSS), the total positive charge of chitosan, directly related to its (DA) over bar, was the key factor affecting the film formation. However, for CMC/CHI films, the pH of the medium and (M-v) over bar of chitosan strongly affected the film structure and composition. Consequently, the structure and the axial composition of chitosan-based films can be finely adjusted by choosing the polyanion and defining the chitosan to be used according to its DA and (M-v) over bar for the desired application, as demonstrated by the antibacterial tests. (AU)

• Processo FAPESP: 13/05135-1 - Recobrimentos antimicrobianos e nanoestruturados contendo quitosana produzidos pela técnica de automontagem (layer-by-layer) para substratos têxteis
• Beneficiário: Thiago Bezerra Taketa
• Modalidade de apoio: Bolsas no Brasil - Doutorado