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Tracking Sulfonated Polystyrene Diffusion in a Chitosan/Carboxymethyl Cellulose Layer-by-Layer Film: Exploring the Internal Architecture of Nanocoatings.
Taketa, Thiago B; Rocha Neto, João Batista M; Dos Santos, Danilo M; Fiamingo, Anderson; Beppu, Marisa M; Campana-Filho, Sérgio Paulo; Cohen, Robert E; Rubner, Michael F.
Afiliação
  • Taketa TB; School of Chemical Engineering, University of Campinas, Campinas, São Paulo 13083-970, Brazil.
  • Rocha Neto JBM; School of Chemical Engineering, University of Campinas, Campinas, São Paulo 13083-970, Brazil.
  • Dos Santos DM; Institute of Chemistry of São Carlos, University of São Paulo, São Carlos, São Paulo 13566-590, Brazil.
  • Fiamingo A; Institute of Chemistry of São Carlos, University of São Paulo, São Carlos, São Paulo 13566-590, Brazil.
  • Beppu MM; School of Chemical Engineering, University of Campinas, Campinas, São Paulo 13083-970, Brazil.
  • Campana-Filho SP; Institute of Chemistry of São Carlos, University of São Paulo, São Carlos, São Paulo 13566-590, Brazil.
  • Cohen RE; Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States.
  • Rubner MF; Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States.
Langmuir ; 36(18): 4985-4994, 2020 05 12.
Article em En | MEDLINE | ID: mdl-32316733
Since chitosan presents the ability to interact with a wide range of molecules, it has been one of the most popular natural polymers for the construction of layer-by-layer thin films. In this study, depth-profiling X-ray photoelectron spectroscopy (XPS) was employed to track the diffusion of sulfonated polystyrene (SPS) in carboxymethyl cellulose/chitosan (CMC/Chi) multilayers. Our findings suggest that the CMC/Chi film does not constitute an electrostatic barrier sufficient to block diffusion of SPS, and that diffusion can be controlled by adjusting the diffusion time and the molecular weight of the polymers that compose the CMC/Chi system. In addition to monitoring the diffusion, it was also possible to observe a process of preferential interaction between Chi and SPS. Thus, the nitrogen N 1s peak, due to functional groups found exclusively in chitosan chains, was the key factor to identifying the molecular interactions involving chitosan and the different polyanions. Accordingly, the presence of a strong polyanion such as SPS shifts the N 1s peak to a higher level of binding energy. Such results highlight that understanding the fundamentals of polymer interactions is a major step to fine-tuning the internal architecture of LbL structures for specific applications (e.g., drug release).
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Tipo de estudo: Prognostic_studies Idioma: En Revista: Langmuir Assunto da revista: QUIMICA Ano de publicação: 2020 Tipo de documento: Article País de afiliação: Brasil País de publicação: Estados Unidos
Texto completo
Adicionar na Minha BVS
Imprimir
XML
PubMed Links
Buscar no Google

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Tipo de estudo: Prognostic_studies Idioma: En Revista: Langmuir Assunto da revista: QUIMICA Ano de publicação: 2020 Tipo de documento: Article País de afiliação: Brasil País de publicação: Estados Unidos