Use of ball mill to prepare nanocellulose from eucalyptus biomass: Challenges and process optimization by combined method

Autor(es)

Ferreira, Rafaela R. ^[1] ; Souza, Alana G. ^[1] ; Nunes, Lucas L. ^[1] ; Shahi, Naresh ^[2] ; Rangari, Vijaya K. ^[3] ; Rosa, Derval dos Santos ^[1]

Afiliação do(s) autor(es)

^[1] Univ Fed ABC UFABC, Ctr Engn Modelagem & Ciencias Sociais Aplicadas C, Ave Estados 5001, BR-09210580 Santo Andre, SP - Brazil

^[2] Tuskegee Univ, Integrat Biosci IBS Grad Sch PHD Program, Tuskegee, AL 26088 - USA

^[3] Tuskegee Univ, Dept Mat Sci & Engn, Tuskegee, AL 26088 - USA

• Tipo de documento: Artigo Científico
• Fonte: MATERIALS TODAY COMMUNICATIONS; v. 22, MAR 2020.
• Citações Web of Science: 0

Resumo

A combination of mechanical methods was developed to obtain a suspension of nanocellulose (NC) from Eucalyptus sawdust. In this two-step process, the ball milling (1-4 h) was followed by a high-intensity ultrasound (10- 30 min) irradiation. The prepared samples were characterized using Fourier-transform infrared spectroscopy, Raman, dynamic and static light scattering, Zeta potential, X-ray diffraction, X-ray photoelectron spectroscopy, Thermogravimetric analysis, Field-emission scanning electron microscopy, and Transmission electron microscopy. The crystallinity was calculated using different methods and compared. The mechanical grinding results in a random and irregular break of the fibers. In a combined method, the ultrasound waves generate more defibrillation and separation of the nanofibers and, consequently, the reduction of fiber diameters. The highintensity ultrasound promoted an increase in the homogeneity, crystallinity, and electrostatic and thermal stability of the NC suspension. The samples milled for 2 h and 20 min ultrasound irradiation presented the highefficiency in obtaining NC. (AU)

• Processo FAPESP: 18/25239-0 - Evolução da dispersão de nanoestruturas de celulose modificadas aplicadas em bionanocompósitos
• Beneficiário: Derval dos Santos Rosa
• Modalidade de apoio: Bolsas no Exterior - Pesquisa
• Processo FAPESP: 18/11277-7 - Filmes de PBAT com nanoestruturas de celulose tratadas com óleos essenciais encapsulados para embalagens ativas
• Beneficiário: Derval dos Santos Rosa
• Modalidade de apoio: Auxílio à Pesquisa - Regular