Surface modification effects on the thermal stability of cellulose nanostructures obtained from lignocellulosic residues

Lima, Giovanni F. de; Souza, Alana G.; Bauli, Clara R.; Barbosa, Rennan F. S.; Rocha, Daniel Belchior; Rosa, Derval dos Santos

doi:10.1007/s10973-019-09109-4

Cited by 17 publications

(7 citation statements)

References 63 publications

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“…One possible explanation is that the polymer chains create a uniform layer that acts as a protective shield on the nanocellulose surface [153]. Recently published works show that increasing the lignin content [154], doping with melamine-grafted nano SiO 2 [155], absorption of surfactants [156] all have a beneficial effect on the thermal stability of cellulose nanomaterials. Methods like these provide opportunities to overcome stability and extraction challenges in these biobased materials, which are important issues to consider for scale-up to industrial production of biobased packaging materials.…”

Section: Discussionmentioning

confidence: 99%

Chitin- and cellulose-based sustainable barrier materials: a review

Bourg

et al. 2020

emergent mater.

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The accumulation of synthetic plastics used in packaging applications in landfills and the environment is a serious problem. This challenge is driving research efforts to develop biodegradable, compostable, or recyclable barrier materials derived from renewable sources. Cellulose, chitin/chitosan, and their combinations are versatile biobased packaging materials because of their diverse biological properties (biocompatibility, biodegradability, antimicrobial properties, antioxidant activity, non-toxicity, and less immunogenic compared to protein), superior physical properties (high surface area, good barrier properties, and mechanical properties), and they can be assembled into different forms and shapes (powders, fibers, films, beads, sponges, gels, and solutions). They can be either assembled into packaging films or used as fillers to improve the properties of other biobased polymers. Methods such as preparation of composites, multilayer coating, and alignment control are used to further improve their barrier, mechanical properties, and ameliorate their moisture sensitivity. With the growing application of cellulose and chitin-based packaging materials, their biodegradability and recyclability are also discussed in this review paper. The future trends of these biobased materials in packaging applications and the possibility of gradually replacing petroleum-based plastics are analyzed in the “Conclusions” section.

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Section: Discussionmentioning

confidence: 99%

Chitin- and cellulose-based sustainable barrier materials: a review

Bourg

et al. 2020

emergent mater.

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“…According to our previous works, cellulose nanocrystals (CNC) were prepared and characterized [26,27]. CNCs had an average length of 2.0 ± 0.8 µm and mean diameter of 131.1 ± 29.6 nm (L/D = 15), and ζ potential of −33.0 ± 1.0 mV [28]. Cellulose nanofibrils (CNF) were kindly provided by Suzano Papel e Celulose (Suzano, São Paulo, Brazil).…”

Section: Methodsmentioning

confidence: 99%

“…At low shear rates, oil droplets are held together due to insufficient hydrodynamic forces to break system bonds, resulting in high viscosity. As the shear rate increases, hydrodynamic forces break the bonds and deform the CNF network and oil droplets, resulting in lower viscosity [28,29]. This behavior is directly related to the chemical bonds present between the emulsion components.…”

Section: Rheologymentioning

confidence: 99%

Chemical Stabilization behind Cardamom Pickering Emulsion Using Nanocellulose

et al. 2022

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Cardamom essential oil (EO) is a rare oil of high scientific and economic interest due to its biofunctionality. This work aims to stabilize the EO by Pickering emulsions with nanocellulose, in the form of nanocrystals (CNC) or nanofibers (CNF), and to investigate the stability and chemical and physical interactions involved in the process. The emulsions were characterized by droplet size, morphology, stability, surface charges, Fourier transform infrared spectroscopy, FT-Raman, nuclear magnetic resonance, and scanning electron microscopy. Stable emulsions were prepared with cellulose morphologies and CNCs resulted in a 34% creaming index, while CNFs do not show instability. Emulsions indicate a possible interaction between nanocellulose, α-terpinyl acetate, and 1,8-cineole active essential oil compounds, where α-terpinyl acetate would be inside the drop and 1,8-cineole is more available to interact with cellulose. The interaction intensity depended on the morphology, which might be due to the nanocellulose’s self-assembly around oil droplets and influence on oil availability and future application. This work provides a systematic picture of cardamomum derived essential oil Pickering emulsion containing nanocellulose stabilizers’ formation and stability, which can further be extended to other value-added oils and can be an alternative for the delivery of cardamom essential oil for biomedical, food, cosmetics, and other industries.

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“…The presence of sodium carboxylate (COONa) and carboxylic acid (-COOH) groups was identified by the peak at 1570 cm −1 . [43] The peak at 1390 cm −1 was attributed to hydroxyl (-OH) from the carboxylate groups. The peak at 1050 cm −1 corresponded to the C-O vibrations of primary and secondary alcohols and the angular deformation of the C-O-C groups of the carbohydrate rings present in the polymer structures and in the lateral groups.…”

Section: Ftir Spectroscopymentioning

confidence: 99%

“…The peak at 1050 cm −1 corresponded to the C-O vibrations of primary and secondary alcohols and the angular deformation of the C-O-C groups of the carbohydrate rings present in the polymer structures and in the lateral groups. [43] The -COOH groups can form hydrogen bonds that hold the CMC chains together, whereas the -COONa groups increase the hydrophilicity and give the CMC hydrogel a transparent appearance. [44] According to Lima et al, [33] therefore, citric acid is a good crosslinker for CMC, a highly hydrophilic crosslinked gel.…”

Section: Ftir Spectroscopymentioning

confidence: 99%

Fungicidal Potential of Polymeric Hydrogels Based on Carboxymethylcellulose and Yerba Mate Residues with the Incorporation of Garlic Oil

et al. 2022

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In the present study, hydrogels are developed from carboxymethylcellulose, with the addition of cellulose nanofibers (CNFs) obtained from yerba mate stick residues and garlic oil. CNFs are obtained via physical (steam explosion), chemical (bleaching), and mechanical (ultrafine friction milling) processes. Garlic oil is encapsulated into sodium alginate for the evaluation of fungicidal potential. The samples are assessed for characteristics such as water absorption capacity (swelling) and inhibitory activity against Fusarium sp. FUS147 in vitro by Fourier-transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), and scanning electron microscopy (SEM). TGA and FTIR spectra confirm the cross-linking mechanism for citric acid in sodium carboxymethylcellulose (CMC) in the hydrogel formation. The incorporation of CNFs, sodium alginate, and garlic oil reduces the temperature at the beginning of thermal degradation, to 47, 38, and 31 °C, respectively, in relation to a hydrogel sample with only carboxymethylcellulose (HC). The swelling analysis reveals an increase of 57% for a sample with CNF, and 42% for a sample with incorporation of garlic oil encapsulated in alginate, in relation to the HC sample. The sample with encapsulated garlic oil shows a high degree of swelling with broad antifungal activity against the Fusarium sp. FUS147, showing great potential for use in agriculture.

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Surface modification effects on the thermal stability of cellulose nanostructures obtained from lignocellulosic residues

Cited by 17 publications

References 63 publications

Chitin- and cellulose-based sustainable barrier materials: a review

Chitin- and cellulose-based sustainable barrier materials: a review

Chemical Stabilization behind Cardamom Pickering Emulsion Using Nanocellulose

Fungicidal Potential of Polymeric Hydrogels Based on Carboxymethylcellulose and Yerba Mate Residues with the Incorporation of Garlic Oil

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