Salt crystallization pressure as a new method to obtain micro and nanocellulose

Autor(es)

Nascimento, Sandra A. ^[1] ; Scopel, Eupidio ^[1] ; Rezende, Camila A. ^[1]

Afiliação do(s) autor(es)

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

• Tipo de documento: Artigo Científico
• Fonte: Cellulose; v. 28, n. 7, p. 4069-4087, MAY 2021.
• Citações Web of Science: 0

Resumo

This work evaluated the crystallization pressure of sodium and magnesium sulphates as a tool to break down and defibrillate plant cell walls, aiming at a novel, environmentally friendly and low-cost methodology to obtain micro and nanofibrilated cellulose. Elephant grass leaves both in natura and delignified were soaked in Na2SO4 and MgSO4 solutions and oven-dried at 105 +/- 3 degrees C to promote salt crystallization, while the damage resulted from the pressure exerted by the growing crystals within the cell walls was evaluated. Na2SO4 crystallization proved to be more effective to unpack and defibrillate cell walls in comparison to MgSO4. In addition, both salts had more noticeable effects in previously delignified samples than in in natura samples. Nanofibrillated cellulose was obtained by Na2SO4 action and after shearing fibres treated with an aqueous MgSO4 solution (30% w/v), glycerol and NaOH (5% w/v). Graphic abstract (AU)

• Processo FAPESP: 18/23769-1 - Obtenção e aplicações de nanoestruturas provenientes de biomassa vegetal
• Beneficiário: Camila Alves de Rezende
• Modalidade de apoio: Auxílio à Pesquisa - Regular