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metadata.artigo.dc.title: Study of morphological properties and rheological parameters of cellulose nanofibrils of cocoa shell (Theobroma cacao L.)
metadata.artigo.dc.creator: Souza, Lucas Oliveira
Lessa, Ozana Almeida
Dias, Matheus Cordazzo
Tonoli, Gustavo Henrique Denzin
Rezende, Denilde Vilas Bôas
Martins, Maria Alice
Neves, Isabelle Cristina Oliveira
Resende, Jaime Vilela de
Carvalho, Elisângela Elena Nunes
Vilas Boas, Eduardo Valério de Barros
Oliveira, Julieta Rangel de
Franco, Marcelo
metadata.artigo.dc.subject: Waste
Cellulose nanofibrils
metadata.artigo.dc.publisher: Elsevier Jun-2019
metadata.artigo.dc.identifier.citation: SOUZA, L. O. et al. Study of morphological properties and rheological parameters of cellulose nanofibrils of cocoa shell (Theobroma cacao L.). Carbohydrate Polymers, [S.l.], v. 214, p. 152-158, June 2019.
metadata.artigo.dc.description.abstract: Cocoa shell was evaluated as a precursor for cellulose nanofibrils (NFCs) using mechanical defibrillation. Its morphology was analysed using optical microscopy and scanning electron microscopy with field emission. Rheological and mechanical behaviour were evaluated through flow curves with a strain rate ranging from 0 to 300 s−1 at 25 °C and by means of oscillatory frequency sweeps (0.01 Hz–10 Hz) and shear stress (3 Pa). The thermal-mechanical behaviour was determined by a temperature sweep with a heating rate of 3 °C min−1 and a temperature range of 25 °C–100 °C. Micrographs identified the presence of protoxilem with a mean diameter of 23.34 nm. The flow curve showed the characteristic behaviour of a pseudoplastic fluid. The storage module (G′) and the loss modulus (G″) were dependent on the frequency applied, indicating that the material exhibits a weak gel characteristic. The viscoelastic characteristics were influenced by temperature. Therefore, cocoa shell is a new alternative in the production of nanocellulose.
metadata.artigo.dc.language: en_US
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DCF - Artigos publicados em periódicos

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