The effects of morpholine pre-treated and carboxymethylated cellulose nanofibrils on the properties of alginate-based hydrogels

Onyianta, Amaka J.; Castellano, Maila; Dorris, Mark; Williams, R. L.; Vicini, Silvia

doi:10.1016/j.carbpol.2018.06.084

Cited by 29 publications

(12 citation statements)

References 36 publications

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“…The total acidic groups content of the extracted cellulose was 131 ± 3 lmol/g. The total acidic groups of wood pulps reported have been reported to be 30 lmol/g and 44 lmol/g by Onyianta et al (2018a) and Pääkko et al (2007) respectively. Although the total acidic groups content of WH cellulose is not considered significant, its presence may be attributed to the double sodium hypochlorite bleaching process, known to partially oxidise the cellulose hydroxyl groups to aldehyde/carboxylic acid groups (Someshwar and Pinkerfon 1992).…”

Section: Surface Chemistry Analyses Of Extracted Cellulose By Conductometric Titration and Ftirmentioning

confidence: 99%

A process for deriving high quality cellulose nanofibrils from water hyacinth invasive species

et al. 2020

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In this study, surface chemistry, the morphological properties, water retention values, linear viscoelastic properties, crystallinity index, tensile strength and thermal properties of water hyacinth (WH) cellulose were correlated with the degree of mechanical processing under high-pressure homogenisation. An initial low-pressure mechanical shear of WH stems resulted in the ease of chemical extraction of good quality cellulose using mild concentrations of chemical reagents and ambient temperature. Further passes through the homogeniser resulted in an overall improvement in cellulose fibrillation into nanofibrils, and an increase in water retention property and linear viscoelastic properties as the number of passes increased. These improvements are most significant after the first and second pass, resulting in up to 7.5% increase in crystallinity index and 50% increase in the tensile strength of films, when compared with the unprocessed WH cellulose. The thermal stability of the WH cellulose was not adversely affected but remained stable with increasing number of passes. Results suggest a high suitability for this process to generate superior quality cellulose nanofibrils at relatively low energy requirements, ideal for sustainable packaging applications and as a structural component to bioplastic composite formulations.

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Section: Surface Chemistry Analyses Of Extracted Cellulose By Conductometric Titration and Ftirmentioning

confidence: 99%

A process for deriving high quality cellulose nanofibrils from water hyacinth invasive species

et al. 2020

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“…Nanocellulose concentrations as low as 5 wt % have been shown to significantly enhance the mechanical properties of calcium crosslinked alginate hydrogels, whereas higher loadings did not lead to further improvements. 92 In addition to vegetal sources, nanocellulose can also be obtained from certain gram-negative bacteria such as Gluconacetobacter xylinus. Bacterial cellulose consists of a 3D network of interconnected cellulose nanofibers and is characterized by high strength and purity.…”

Section: Bio-based Composites Of Nanocellulose and Hydrogelsmentioning

confidence: 99%

Bio-based composite hydrogels for biomedical applications

Buwalda

2020

Multifunct. Mater.

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Hydrogels are three-dimensional, water-swollen polymer networks that have been widely studied for biomedical applications such as tissue engineering and the controlled delivery of biologically active agents. Since the pioneering work of Wichterle and Lim in the 1960s, hydrogel research has shifted from relatively simple single polymer networks to multifunctional composite hydrogels that better mimic the complex nature of living tissues. Bio-based polymers, which can be obtained from renewable natural resources, attract increasing attention for use in biomaterials in view of the recent demands for a reduction in the environmental impact of the polymer industry and the development of a sustainable society. Moreover, biobased polymers are often biodegradable and exhibit a significant level of biocompatibility and biomimicry, which are highly desired properties with regard to in vivo application. This review presents the state-of-the-art in the field of bio-based composite hydrogels for biomedical applications, thereby focusing on different types of polymeric components that have been combined with hydrogels to obtain materials with unique, synergistic properties: particles (including micelles and microspheres), electrospun fibres and nanocellulose. In addition, the challenges are described that should be overcome to facilitate clinical application of these versatile and environmentally responsible biomaterials.

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“…Introduced charged groups impart new properties that are different from the untreated cellulose material. Onyianta et al [10] compared the effect of CNF prepared by different pretreatment methods on the formation of crosslinked hydrogel. This study shows that the network structure, storage modulus and swelling degree of the CNF composite hydrogel are influenced by the presence or absence of anionic surface charge on CNF.…”

Section: Introductionmentioning

confidence: 99%

Incorporation of CNF with Different Charge Property into PVP Hydrogel and Its Characteristics

Park

Goo

et al. 2021

Nanomaterials

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Cellulose nanofibril (CNF)-added polyvinylpyrrolidone (PVP) hydrogels were prepared using different types of CNFs and their properties were investigated. CNFs with different morphology and surface charge properties were prepared through quaternization and carboxymethylation pretreatments. The quaternized CNF exhibited the narrow and uniform width, and higher viscoelastic property compared to untreated and carboxymethylated CNF. When CNF was incorporated to PVP hydrogel, gel contents of all hydrogels were similar, irrespective of CNF addition quantity or CNF type. However, the absorptivity of the hydrogels in a swelling medium increased by adding CNF. In particular, the quaternized CNF-added PVP hydrogel exhibited the highest swelling ability. Unlike that of hydrogels with untreated and carboxymethylated CNFs, the storage modulus of PVP hydrogels after swelling significantly increased with an increase in the content of the quaternized CNF. These indicate that a PVP hydrogel with a high absorptivity and storage modulus can be prepared by incorporating the proper type of CNF.

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The effects of morpholine pre-treated and carboxymethylated cellulose nanofibrils on the properties of alginate-based hydrogels

Cited by 29 publications

References 36 publications

A process for deriving high quality cellulose nanofibrils from water hyacinth invasive species

A process for deriving high quality cellulose nanofibrils from water hyacinth invasive species

Bio-based composite hydrogels for biomedical applications

Incorporation of CNF with Different Charge Property into PVP Hydrogel and Its Characteristics

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