Combination of graphene oxide with flax-derived cellulose dissolved in NaOH/urea medium to generate hierarchically structured composite carbon aerogels

Tang, Lvqiao; Feng, Yucheng; He, Weijian; Yang, Fei

doi:10.1016/j.indcrop.2018.12.068

Cited by 16 publications

(7 citation statements)

References 33 publications

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“…The cross-linked cellulose-based hydrogels with borax were prepared by dissolving 3 g of dried chemical-treated cellulose fibers into an aqueous solution of 7% NaOH and 12% urea at a low temperature of ~ − 12 °C with vigorous stirring for 3 min to obtain a transparent cellulose solution 31 . After that, the prepared cellulose solution was mixed with various concentrations of borax at room temperature with continuous stirring for 5 min.…”

Section: Methodsmentioning

confidence: 99%

Superabsorbent cellulose-based hydrogels cross-liked with borax

Tanpichai

Phoothong

Boonmahitthisud

2022

Sci Rep

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Cellulose, the most abundant biopolymer on Earth, has been widely attracted owing to availability, intoxicity, and biodegradability. Environmentally friendly hydrogels were successfully prepared from water hyacinth-extracted cellulose using a dissolution approach with sodium hydroxide and urea, and sodium tetraborate decahydrate (borax) was used to generate cross-linking between hydroxyl groups of cellulose chains. The incorporation of borax could provide the superabsorbent feature into the cellulose hydrogels. The uncross-linked cellulose hydrogels had a swelling ratio of 325%, while the swelling ratio of the cross-linked hydrogels could achieve ~ 900%. With increasing borax concentrations, gel fraction of the cross-linked hydrogels increased considerably. Borax also formed char on cellulose surfaces and generated water with direct contact with flame, resulting in flame ignition and propagation delay. Moreover, the cross-linked cellulose-based hydrogels showed antibacterial activity for gram-positive bacteria (S. aureus). The superabsorbent cross-linked cellulose-based hydrogels prepared in this work could possibly be used for wound dressing, agricultural, and flame retardant coating applications.

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Section: Methodsmentioning

confidence: 99%

Superabsorbent cellulose-based hydrogels cross-liked with borax

Tanpichai

Phoothong

Boonmahitthisud

2022

Sci Rep

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“…According to the diffractograms, the BC sample seems amorphous because the crystalline peaks are very wide, whereas the CC50BC and CC100BC samples present the crystalline and narrow peaks. The XRD spectra of cellulose/GNP cryogels shown in Figure 2 (c), show the same pattern as the GNP spectrum, with a peak at ~ 26º associated with stacked crystalline graphitic sheets or bulk graphite 41 . Cryogels show a weakening of this peak after the incorporation of GNPs, because the mass of GNP decreases when it is added to cellulose, which reflects a decrease in the degree of graphitization of cryogels 41,42 .…”

Section: Xrd and Crystalinity Indexmentioning

confidence: 71%

Thermal Degradation Kinetics and Lifetime Prediction of Cellulose Biomass Cryogels Reinforced by its Pyrolysis Waste

et al. 2022

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Degradation kinetics is an important tool in order to understand and improve energy conversion and the final application of a material. Cellulose cryogels (CC) are a new class of materials that can be reinforced by several types of particle, including biochar. Apart from it, degradation kinetics and lifetime prediction of biomass cellulose cryogels reinforced by cellulose pyrolysis waste (BC) has been investigated using TG techniques and iso-conversional model free methods. Additionally, the same study was applied to cellulose cryogels reinforced by graphene nanoplatelets (NPG) to compare the behavior of a filler from waste (BC) and a noble filler (NPG). Furthermore, the influence of the addition of the fillers into the cellulose biomass were evaluated in terms of thermal stability and crystallinity. BC and GNP led to higher values of activation energies ( a E ) calculated from modelfree isoconversional methods and all samples degraded in two-steps. Finally, lifetime prediction was successfully applied and the CC cryogel became more stable over time, maintaining almost 80% of the mass for 1 year exposed at 180 °C. The results of this study shown that only cellulose biomass cryogels are more suitable to produce thermal insulators due to it higher thermal stability.

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“…Aligned porous hybrid structures based on the NCs-GO/rGO building blocks exhibit promising potentials in environmental remediation applications with desirable superior absorption feature capacities, selectivity, and sustainability. ,, Figure displays the state-of-the-art of the most advanced NCs-GO/rGO hybrid aerogels, absorbents, and membranes with highly absorptive capacities fabricated by conventional and directional freeze casting drying techniques. ,,,,,− It is commonly known that the charged organic–inorganic species can be absorbed electrostatically via the absorbent charged sites. Accordingly, the NCs-GO/rGO hybrids with abundant functional groups in the basal-center-edges planes can act as superior absorption sites for various pollutants (heavy ions, oils, and chemical solvents).…”

Section: Nanocellulose-graphene Derivative Hybrid Materials and Their...mentioning

confidence: 99%

Section: Nanocellulose-graphene Derivative Hybrid Materials and Their...mentioning

confidence: 99%

Nanocellulose-Graphene Derivative Hybrids: Advanced Structure-Based Functionality from Top-down Synthesis to Bottom-up Assembly

Brakat

Zhu

2021

ACS Appl. Bio Mater.

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There is an emerging endeavor of advanced structure-based functionality in the next-generation advanced functional materials inspired by hierarchical architecture for future technical applications. This review provides an impressive range roadmap for constructing advanced functional materials based on the nanocellulose-graphene derivative hybrids, from the top-down synthesis of their hierarchical materials to the bottom-up assembly of their nanoscale building blocks. First, the roadmap started from the top-down synthesis routes of nanocellulose-graphene hierarchical materials into their derivatives, where the pristine properties of nanoscale building blocks are still accessible and processable. Then, the stable-strong synergistic interfacial interactions between nanocellulose chains and graphene derivative nanosheets are uniquely well-suited in this roadmap for constructing scalable hybrid materials with interesting emergent properties. After that, the roadmap presented the bottom-up assembly approaches of these versatile nanoscale building blocks through self-assembly, templating, and mimicking of the bioinspired hierarchical structures toward advanced functional materials. Thereafter, toward understanding the specificity, superiority, and functionality of such hybrid materials, the roadmap discussed the properties and potential applications so far. Finally, the roadmap pointed out the key challenges and future outlooks, paving the way for comprehensive understanding and ideal designing of hybrid structures from nanocellulose and graphene derivatives.

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Combination of graphene oxide with flax-derived cellulose dissolved in NaOH/urea medium to generate hierarchically structured composite carbon aerogels

Cited by 16 publications

References 33 publications

Superabsorbent cellulose-based hydrogels cross-liked with borax

Superabsorbent cellulose-based hydrogels cross-liked with borax

Thermal Degradation Kinetics and Lifetime Prediction of Cellulose Biomass Cryogels Reinforced by its Pyrolysis Waste

Nanocellulose-Graphene Derivative Hybrids: Advanced Structure-Based Functionality from Top-down Synthesis to Bottom-up Assembly

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