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Surface modifications and polyelectrolyte adsorption via layer-by-layer onto cellulose nanofibers for the production of antimicrobial aerogels

Grant number: 17/07013-1
Support type:Scholarships in Brazil - Post-Doctorate
Effective date (Start): June 01, 2017
Effective date (End): December 02, 2020
Field of knowledge:Physical Sciences and Mathematics - Chemistry - Physical-Chemistry
Principal researcher:Watson Loh
Grantee:Caio Gomide Otoni
Home Institution: Instituto de Química (IQ). Universidade Estadual de Campinas (UNICAMP). Campinas , SP, Brazil
Associated research grant:15/25406-5 - Organizing matter: colloids formed by association of surfactants, polymers and nanoparticles, AP.TEM
Associated scholarship(s):19/00370-9 - Multifunctional materials from nanochitin, BE.EP.PD


In line with the increasing demand for sustainable multifunctional materials, this study is intended to produce highly porous materials featuring extremely low densities - so called aerogels - using cellulose nanofibers extracted from renewable sources, such as the agricultural waste generated in sugarcane processing (bagasse). In an effort to provide the nanocellulose aerogels with antimicrobial properties, these will be functionalized through the attachment of positively charged compounds onto their surfaces by means of a (1) chemical approach, involving the cationization of cellulose nanofibers upon grafting with molecules such as glycidyltrimethylammonium chloride, as well as of a (2) physical approach, by the adsorption of multiple, alternate layers of anionic (sodium alginate) and cationic (chitosan) polyelectrolytes onto their surfaces through layer-by-layer. Regardless of the approach, the leaching of the active components towards the environment is to be avoided in order to prevent antibiotic resistance. The materials will be comprehensively characterized as to their morphological, structural, and antimicrobial properties. Special emphasis will be given to the study of the interaction among cellulose nanofibers and the tested polyelectrolytes as well as to the production of a product with feasible practical application in antimicrobial active systems. (AU)

Scientific publications (4)
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
OTONI, CAIO G.; QUEIROS, MARCOS V. A.; SABADINI, JULIA B.; ROJAS, ORLANDO J.; LOH, WATSON. Charge Matters: Electrostatic Complexation As a Green Approach to Assemble Advanced Functional Materials. ACS OMEGA, v. 5, n. 3, p. 1296-1304, JAN 28 2020. Web of Science Citations: 0.
AZEREDO, HENRIETTE M. C.; OTONI, CAIO G.; CORREA, DANIEL S.; ASSIS, ODILIO B. G.; DE MOURA, MARCIA R.; MATTOSO, LUIZ HENRIQUE C. Nanostructured Antimicrobials in Food Packaging-Recent Advances. Biotechnology Journal, SEP 2019. Web of Science Citations: 0.
ESPITIA, PAULA J. P.; FUENMAYOR, CARLOS A.; OTONI, CAIO G. Nanoemulsions: Synthesis, Characterization, and Application in Bio-Based Active Food Packaging. COMPREHENSIVE REVIEWS IN FOOD SCIENCE AND FOOD SAFETY, v. 18, n. 1, p. 264-285, JAN 2019. Web of Science Citations: 25.
BEMARDINELLI, OIGRES D. High-Pressure Microfluidization as a Green Tool for Optimizing the Mechanical Performance of All-Cellulose Composites. ACS SUSTAINABLE CHEMISTRY & ENGINEERING, v. 6, n. 10, p. 12727-12735, OCT 2018. Web of Science Citations: 2.

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