roperties of Cellulose Nanofibers Extracted from Eucalyptus and their Emulsifying Role in the Oil-in-Water Pickering Emulsion

Author(s)

Martins, Lilian S. ^[1] ; dos Santos, Ronaldo Goncalves ^[2] ; Silva Spinace, Marcia A. ^[1]

Affiliation

^[1] Fed Univ ABC, Ctr Nat & Human Sci, Av Estados 5001, BR-09210170 Santo Andre, SP - Brazil

^[2] Ctr Univ FEI, Dept Chem Engn, Rua Humberto de Alencar Castelo Branco, SP 3592, BR-09771220 Sao Bernardo Do Campo - Brazil

• Document type: Journal article
• Source: WASTE AND BIOMASS VALORIZATION; v. 13, n. 1, SI, p. 689-705, JAN 2022.
• Web of Science Citations: 0

Abstract

In this work, nanocellulose particles were obtained from eucalyptus fibers by high-pressure homogenization (CNF) and by high-intensity ultrasound (SCNF). The nanocellulose was applied as a solid emulsifier for soybean oil in water (O/W) emulsions. The adding of 0.25-1 wt.% of both CNF and SCNF produced stable O/W emulsions without conventional surfactants. SCNF emulsions showed the highest stability and displayed the narrowest size distribution. Zeta potential values (- 40 to - 70 mV) indicated an electrical barrier to the droplet coalescence. The rheological behavior of O/W emulsions stabilized with CNF and SCNF was described by the Herschel-Buckley model. O/W emulsions produced with nanocellulose particles behave as shear thinning fluid, and their behavior index ranged from 0.33 to 0.68. Both CNF and SCNF emulsions displayed maximum yield stress at a particle concentration of 0.5 wt.% and 0.75 wt.%, respectively. Besides, the prepared O/W emulsions using 0.5 to 1.00 wt.% CNF or SCNF did not showed phase separation until 30 days of rest. The data point out to the feasibility of using nanocellulose as a natural emulsifier, which can replace conventional surfactants. (AU)

• FAPESP's process: 11/00156-5 - Coupling agent effect on the environment properties of polymeric composites with lignocellulosic fibers
• Grantee: Márcia Aparecida da Silva Spinacé
• Support Opportunities: Regular Research Grants
• FAPESP's process: 10/17804-7 - Polymeric composites
• Grantee: Maria Isabel Felisberti
• Support Opportunities: Research Projects - Thematic Grants