Nanofibrils vs nanocrystals bio-nanocomposites based on sodium alginate matrix: an improved-performance study
| Autor: | Nereida Cordeiro, M. Leskovšek, B. Deepa, Laly A. Pothan, Gregor Primc, Marija Gorjanc, Sabu Thomas, Marisa Faria, Yasir Beeran Pottathara, Miran Mozetič, Eldho Abraham |
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| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Materials science
Sonication Nanofibrils engineering.material Article Nanomaterials Nanocellulose Faculdade de Ciências Exatas e da Engenharia Phase (matter) Nanotechnology Agricultural technology lcsh:Social sciences (General) lcsh:Science (General) Porosity Multidisciplinary Nanocomposite Materials characterization Nanocrystals TEMPO-Mediated oxidation Chemical engineering engineering Kapok fiber lcsh:H1-99 Biopolymer Materials property Dispersion (chemistry) Sodium alginate lcsh:Q1-390 |
| Zdroj: | Repositório Científico de Acesso Aberto de Portugal Repositório Científico de Acesso Aberto de Portugal (RCAAP) instacron:RCAAP Heliyon, Vol 6, Iss 2, Pp e03266-(2020) Heliyon |
| Popis: | To develop bio-nanocomposites using natural biopolymers, nanocomposite films were prepared based on sodium alginate and kapok nanofibrils (CNFs). CNFs when subjected to TEMPO-mediated oxidation gave rise to cellulose nanocrystals (TOCNCs), with carboxyl groups at the surface (Ka/Kb = 3.64). The differences between the two types of nanocelluloses (nanofibrils and nanocrystals) and their impact in the preparation of bio-nanocomposites, were studied. When incorporated in the matrix, the CNFs particles have the tendency to form surface aggregation (Ka/Kb = 2.37), distorting the alginate network, creating heterogeneous films, with high surface roughness (Sa = 29.37 nm), porosity (Dp = 0.087 cm2/min) and vulnerability to heat. The TOCNCs present good dispersion creating a 3D network, which forms uniform (Dp = 0.122 cm2/min) and homogeneous films, with smooth surface (Sa = 16.83 nm). The ultrasonication treatment facilitated the dispersion improving the interfacial interaction between the reinforcing phase and the matrix. The results show the reinforcement potential of kapok nanocellulose in an industrially and medically important biopolymer, sodium alginate, especially when TOCNCs and ultrasonication were used. Materials science; Nanotechnology; Nanomaterials; Materials characterization; Materials property; Agricultural technology; Nanofibrils; Nanocrystals; TEMPO-Mediated oxidation; Sodium alginate; Kapok fiber; Nanocomposite |
| Databáze: | OpenAIRE |
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