| Full text | |
| Author(s): |
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]
Total Authors: 8
|
| Affiliation: | [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
Total Affiliations: 4
|
| Document type: | Journal article |
| Source: | Langmuir; v. 34, n. 4, p. 1429-1440, JAN 30 2018. |
| Web of Science Citations: | 5 |
| Abstract | |
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) | |
| 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 |