Mechanical properties of graphene oxide-based composite layered-materials

Sabzevari, Mina; Cree, Duncan; Wilson, Lee D.

doi:10.1016/j.matchemphys.2019.05.091

Cited by 15 publications

(10 citation statements)

References 33 publications

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“…As evidenced in Figure 1a, the SEM image of GO revealed a denser layered-structure when compared to its cross-linked forms [14]. The GO-based sorbents (GO-CTS and GO-Al) in Figure 1a,b possess a layered-structure that appeared to consist of several two-dimensional GO sheets, in agreement with another report [46]. The cross-linking of GO sheets with chitosan and Al 3+ ions resembled a network-like layered structure.…”

Section: Morphology Of Go-based Sorbentssupporting

confidence: 89%

“…As indicated in Section 1, a comparative study of the role of cross-linker species (CTS, Al 3+ ) for the cross-linking of GO is required. While the use of cross-linkers described herein is reported in isolated studies [28][29][30][31][32][33]36,46], there is a need to examine the adsorption properties of such GO-based composites in a systematic fashion using complementary methods. Thus, a complementary materials characterization of the cross-linked GO composites was carried out to gain further insight on the role of these cross-linkers in such GO composites at fixed composition and the role of cross-linking on the adsorption properties toward gaseous adsorbates (H 2 O, N 2 ), along with a model dye (MB) in aqueous media.…”

Section: Resultsmentioning

confidence: 99%

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Gas and Solution Uptake Properties of Graphene Oxide-Based Composite Materials: Organic vs. Inorganic Cross-Linkers

2019

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This study focused on a comparison of the adsorption properties of graphene oxide (GO) and its composites that were prepared via cross-linking with chitosan (CTS) or Al3+ species, respectively. Comparative material characterization was achieved by several complementary methods: SEM, NMR spectroscopy, zeta-potential, dye-based adsorption, and gas adsorption at equilibrium and dynamic conditions. SEM, solids NMR, and zeta-potential results provided supporting evidence for cross-linking between GO and the respective cross-linker units. The zeta-potential of GO composites decreased upon cross-linking due to electrostatic interactions and charge neutralization. Equilibrium and kinetic adsorption profiles of the GO composites with methylene blue (MB) in aqueous media revealed superior uptake over pristine GO. The monolayer adsorption capacity (mg g−1) of MB are listed in descending order for each material: GO–CTS (408.6) > GO–Al (351.4) > GO (267.1). The gas adsorption results showed parallel trends, where the surface area and pore structure of the composites exceeded that for GO due to pillaring effects upon cross-linking. The green strategy reported herein for the preparation of tunable GO-based composites revealed versatile adsorption properties for diverse heterogeneous adsorption processes.

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Section: Morphology Of Go-based Sorbentssupporting

confidence: 89%

Section: Resultsmentioning

confidence: 99%

Gas and Solution Uptake Properties of Graphene Oxide-Based Composite Materials: Organic vs. Inorganic Cross-Linkers

2019

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“…The used films were further analyzed using a digital microscope, where the corresponding images revealed that the algae cells attached to the Chi film were ruptured (shown in red arrow) (Figure 6e). The presence of positively charged amine groups of chitosan promote electrostatic interaction with the negatively charged algal cells, which contribute to cell rupture [53,54]. The algae cells in Figure 6f-h show that the cells were preserved after the mitigation process.…”

Section: Sem and Digital Microscopy Analyses Of The Films After Mitig...mentioning

confidence: 99%

“…After 24 h, the swollen films were removed, wiped with filter paper to remove residual excess water and then weighed. The SI was calculated using Equation (3) as reported by Sabzevari et al [54]. Three films were tested at each film composition to obtain the average swelling index.…”

Section: Swelling Index (Si)mentioning

confidence: 99%

Photocatalytic Remediation of Harmful Alexandrium minutum Bloom Using Hybrid Chitosan-Modified TiO2 Films in Seawater: A Lab-Based Study

et al. 2022

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The uncontrolled growth of harmful algal blooms (HABs) can negatively impact the environment and pose threats to human health and aquatic ecosystems. Titanium dioxide (TiO2) is known to be effective in killing harmful algae through flocculation and sedimentation. However, TiO2 in a dispersed form can harm other non-target marine organisms, which has raised concerns by environmentalists and scientists. This research seeks to explore the utility of immobilized titanium oxide as a photocatalyst for mitigation of HABs, where the Alexandrium minutum bloom was used as a model system herein. Chitosan was modified with 0.2 wt.% TiO2 (Chi/TiO2 (x mL; x = 1, 3 and 5 mL) and the corresponding films were prepared via solvent casting method. Scanning electron microscope (SEM) images of the films reveal a highly uneven surface. X-ray diffraction (XRD) analysis indicates the reduction in chitosan crystallinity, where the presence of TiO2 was negligible, in accordance with its dispersion within the chitosan matrix. The photocatalytic mitigation of A.minutum was carried out via a physical approach in a laboratory-scale setting. The negative surface charge of the films was observed to repel the negatively charged A.minutum causing fluctuation in the removal efficiency (RE). The highest RE (76.1 ± 13.8%) was obtained when Chi/TiO2 (1 mL) was used at 72 h, where the hydroxyl radicals generated were inferred to contribute to the deactivation of the algae cells by causing oxidative stress. An outcome of this study indicates that such hybrid films have the potential to replace the non-immobilized (dispersed) TiO2 for HAB mitigation. However, further investigation is required to deploy these films for field applications at a larger scale.

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“…Graphene is a recent discovered allotrope form of carbon that inspired the scientific world and broadened the field of application for composite materials due to its distinguished highly specific surface area, mechanical, electrical, and thermal properties [38][39][40][41][42][43][44]. The practical use of graphene is limited because of the costs generated by the production methods, its poor solubility, and its tendency to agglomerate when used in composite formulations [45].…”

Section: Of 15mentioning

confidence: 99%

Recent Advances in Graphene Oxide-Based Anticorrosive Coatings: An Overview

Necolau

Pandele

2020

Coatings

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The present review outlines the most recent advance in the field of anticorrosive coatings based on graphene oxide nanostructures as active filler. This carbonaceous material was extensively used in the last few years due to its remarkable assets and proved to have a significant contribution to composite materials. Concerning the graphene-based coatings, the synthesis methods, protective function, anticorrosion mechanism, feasible problems, and some methods to improve the overall properties were highlighted. Regarding the contribution of the nanostructure used to improve the capability of the material, several modification strategies for graphene oxide along with the synergistic effect exhibited when functionalized with other compounds were mainly discussed.

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Mechanical properties of graphene oxide-based composite layered-materials

Cited by 15 publications

References 33 publications

Gas and Solution Uptake Properties of Graphene Oxide-Based Composite Materials: Organic vs. Inorganic Cross-Linkers

Gas and Solution Uptake Properties of Graphene Oxide-Based Composite Materials: Organic vs. Inorganic Cross-Linkers

Photocatalytic Remediation of Harmful Alexandrium minutum Bloom Using Hybrid Chitosan-Modified TiO2 Films in Seawater: A Lab-Based Study

Recent Advances in Graphene Oxide-Based Anticorrosive Coatings: An Overview

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