Isolation and characterization of cellulose nanofibrils from Colombian Fique decortication by-products.
Carbohydr Polym
; 189: 169-177, 2018 Jun 01.
Article
em En
| MEDLINE
| ID: mdl-29580395
ABSTRACT
Fique fibers are extracted from Furcraea spp. leaves, with 5% average mass yield, using mechanical decortication. Juice, pulp and tow, the by-products of this process, amount 95% of the leaf weight and are considered waste. We extracted cellulose nanofibrils (CNF) from Fique tow, via ultrasound-assisted TEMPO followed by mechanical disintegration with sonication. Fique CNF exhibit diameters around 100â¯nm, degree of oxidation (DO) of 0.27 and surface charge density (σ) of 1.6â¯mmol/g. Fique CNF aqueous suspensions show optical birefringence and high colloidal stability due to a high ζ potential (-53â¯mV). The morphology, chemical structure, crystallinity and phase transitions of Fique CNF were studied using FESEM, IR-ATR, XRD and TGA. We observed that the delignification pretreatment and the TEMPO reaction assisted by ultrasound significantly increase Fique CNF σ and ζ potential, in contrast with the oxidation carried out without ultrasound or with raw (lignified) tow.
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
País/Região como assunto:
America do sul
/
Colombia
Idioma:
En
Revista:
Carbohydr Polym
Ano de publicação:
2018
Tipo de documento:
Article