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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Tracking Sulfonated Polystyrene Diffusion in a Chitosan/Carboxymethyl Cellulose Layer-by-Layer Film: Exploring the Internal Architecture of Nanocoatings

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Author(s):
Taketa, Thiago B. [1] ; Rocha Neto, Joao Batista M. [1] ; dos Santos, Danilo M. [2] ; Fiamingo, Anderson [2] ; Beppu, Marisa M. [1] ; Campana-Filho, Sergio Paulo [2] ; Cohen, Robert E. [3] ; Rubner, Michael F. [4]
Total Authors: 8
Affiliation:
[1] Univ Estadual Campinas, Sch Chem Engn, BR-13083970 Campinas, SP - Brazil
[2] Univ Estadual Campinas, Inst Chem, BR-13083970 Campinas, SP - Brazil
[3] MIT, Dept Mat Sci & Engn, Cambridge, MA 02139 - USA
[4] MIT, Dept Chem Engn, Cambridge, MA 02139 - USA
Total Affiliations: 4
Document type: Journal article
Source: Langmuir; v. 36, n. 18, p. 4985-4994, MAY 12 2020.
Web of Science Citations: 0
Abstract

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). (AU)

FAPESP's process: 13/05135-1 - Nanostructured antimicrobial coatings containing chitosan produced by self-assembly technique (layer-by-layer) for textile substrates
Grantee:Thiago Bezerra Taketa
Support Opportunities: Scholarships in Brazil - Doctorate