Low-energy preparation of cellulose nanofibers from sugarcane bagasse by modulating the surface charge density

Autor(es)

Pinto, Lidiane O. ^{[1, 2]} ; Bernardes, Juliana S. ^[2] ; Rezende, Camila A. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Inst Chem, POB 6154, BR-13083970 Campinas, SP - Brazil

^[2] Brazilian Ctr Res Energy & Mat CNPEM, Brazilian Nanotechnol Natl Lab LNNano, POB 6192, BR-13083970 Campinas, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Carbohydrate Polymers; v. 218, p. 145-153, AUG 15 2019.
• Citações Web of Science: 1

Resumo

In this work, cellulose nanofibers (CNF) were obtained from sugarcane bagasse (SC) without high-energy mechanical treatments, using TEMPO-mediated oxidation. Variable NaClO concentrations were used to impart electrostatic repulsion between surface charged groups thus facilitating fibril separation. CNFs with diameters in the 3-5 nm range were obtained by oxidation of SC pulp with NaClO at 25 and 50 mmol/g. After a 30 min-sonication step, these CNFs were broken down into cellulose nanocrystals (CNC) by mechanical action. Both CNF and CNC preparation by this method are possible in SC due to its particular cell wall morphology and were not achieved in eucalyptus biomass, which is more recalcitrant. This work provided thus a new pathway to modulate the final morphology of cellulose particles by combining a low recalcitrant raw material with different surface charge densities. (AU)

• Processo FAPESP: 16/13602-7 - Estudo sobre estratégias para o aproveitamento integral da biomassa lignocelulósica
• Beneficiário: Camila Alves de Rezende
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOEN - Regular
• Processo FAPESP: 16/04514-7 - Estudo do uso de nanopartículas de celulose no controle reológico de fluidos complexos
• Beneficiário: Juliana da Silva Bernardes
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOEN - Regular