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Stability of oil in water emulsions by cellulose nanocrystals, polycations and ultrasound

Grant number: 13/03480-3
Support type:Scholarships in Brazil - Scientific Initiation
Effective date (Start): April 01, 2013
Effective date (End): December 31, 2014
Field of knowledge:Physical Sciences and Mathematics - Chemistry - Physical-Chemistry
Principal Investigator:Denise Freitas Siqueira Petri
Grantee:Amanda Araujo Domingues
Home Institution: Instituto de Química (IQ). Universidade de São Paulo (USP). São Paulo , SP, Brazil


Emulsions are widely used in food, cosmetics, paints, agriculture products, pharmaceuticals formulations as well as in the petroleum industry. The most common strategies applied for emulsions stabilization are the addition of surfactants, functional polymers, solid particles or the application of ultrasonic radiation. In this project, the colloidal stability of oil in water (O/W) emulsions in (a) the absence, (b) in the presence of poly(4-vynil-N-pentyl pyridinium bromide) (QPVP-C5), (c) in the presence of cellulose nanocrystals (NC) produced by acid or enzymatic hydrolysis and (d) in the presence of both QPVP-C5 and NC will be investigated. The systems will be treated with ultrasonic radiation, in order to reduce the mean size and the size distribution of oil droplets. The characterization of emulsions and their colloidal stability will be studied by monitoring the changes in the transmitted light as a function of time, mean droplets size and droplets size distribution by means of dynamic light scattering. (AU)

Scientific publications
(References retrieved automatically from Web of Science and SciELO through information on FAPESP grants and their corresponding numbers as mentioned in the publications by the authors)
DOMINGUES, AMANDA A.; PEREIRA, FABIANO V.; SIERAKOWSKI, MARIA RITA; ROJAS, ORLANDO J.; PETRI, DENISE F. S. Interfacial properties of cellulose nanoparticles obtained from acid and enzymatic hydrolysis of cellulose. Cellulose, v. 23, n. 4, p. 2421-2437, AUG 2016. Web of Science Citations: 7.

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