Comparison of the effect of argon, hydrogen, and nitrogen gases on the reduced graphene oxide-hydroxyapatite nanocomposites characteristics

Nosrati, Hassan; Sarraf-Mamoory, Rasoul; Behnagh, Arman Karimi; Emameh, Reza Zolfaghari; Aidun, Amir; Le, Dang Quang Svend; Pérez, María Canillas; Bünger, Cody

doi:10.1186/s13065-020-00712-3

Cited by 6 publications

(3 citation statements)

References 69 publications

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“…In comparison, the RGO membranes treated in air have higher reverse flux selectivity with higher water flux than those treated under nitrogen at 170 °C. Under the nitrogen atmosphere, the removal of oxygen functional groups from GO could be more efficient, thus possibly producing RGO membranes that are less hydrophilic than those under the air atmosphere, as observed in the FO measurements where J w of an RGO membrane treated in N 2 is lower than that of an RGO membrane treated in air under the same annealing temperature, in particular, at a higher temperature of 170 °C.…”

Section: Resultsmentioning

confidence: 99%

Tuning Fabrication Factors for Reduced Graphene Oxide Forward Osmosis Membranes

Nde,

Appiah-Kubi,

Watt

et al. 2024

J. Phys. Chem. C

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Forward osmosis (FO) may serve as a near-zero energy approach for wastewater management and selective chemical enrichment with an appropriate FO membrane. There is a need for novel FO membranes with better physical stability, chemical compatibility, and enhanced reverse flux selectivity. In this work, we have systematically studied a variety of factors for fabricating thermally reduced graphene oxide (RGO) FO filtration membranes and have demonstrated that with a comparable water flux, the RGO membranes have an exceptionally large reverse flux selectivity with 1.5 M sodium sulfate draw solution, about 7 times larger than that of cellulose triacetate membranes under the same testing condition. The interlayer spacing of the membranes can be fine-tuned by varying temperatures, so that the free interlayer spacing is less than 0.7 nm after exposure to water. The RGO-based membranes offer a few advantages with high reverse flux selectivity, mechanical robustness with strong adhesion to nylong support membranes without damage after FO tests and tape peel tests, and enhanced chromate and chlorine resistance. We have further demonstrated that in the FO processes, one can concentrate waste brine while simultaneously harvesting the osmotic energy as electricity, offering potential applications of forward osmosisbased osmotic batteries for powering electronic devices.

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Section: Resultsmentioning

confidence: 99%

Tuning Fabrication Factors for Reduced Graphene Oxide Forward Osmosis Membranes

Nde,

Appiah-Kubi,

Watt

et al. 2024

J. Phys. Chem. C

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“…The densification phenomenon, translated into progressive grain growth, is favored by the nitrogen ambient and by the increase of the Gr content, as previously advertised for other inert or reductive sintering environments [ 66 ]. However, one must take into account that, under these sintering conditions, the ceramic matrix also suffers severe structural transformations, as highlighted in Figure 1 , Figure 2 , Figure 3 and Figure 4 , which further contribute to the recorded morphological evolution.…”

Section: Resultsmentioning

confidence: 99%

Fiber-Templated 3D Calcium-Phosphate Scaffolds for Biomedical Applications: The Role of the Thermal Treatment Ambient on Physico-Chemical Properties

et al. 2021

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A successful bone-graft-controlled healing entails the development of novel products with tunable compositional and architectural features and mechanical performances and is, thereby, able to accommodate fast bone in-growth and remodeling. To this effect, graphene nanoplatelets and Luffa-fibers were chosen as mechanical reinforcement phase and sacrificial template, respectively, and incorporated into a hydroxyapatite and brushite matrix derived by marble conversion with the help of a reproducible technology. The bio-products, framed by a one-stage-addition polymer-free fabrication route, were thoroughly physico-chemically investigated (by XRD, FTIR spectroscopy, SEM, and nano-computed tomography analysis, as well as surface energy measurements and mechanical performance assessments) after sintering in air or nitrogen ambient. The experiments exposed that the coupling of a nitrogen ambient with the graphene admixing triggers, in both compact and porous samples, important structural (i.e., decomposition of β-Ca3(PO4)2 into α-Ca3(PO4)2 and α-Ca2P2O7) and morphological modifications. Certain restrictions and benefits were outlined with respect to the spatial porosity and global mechanical features of the derived bone scaffolds. Specifically, in nitrogen ambient, the graphene amount should be set to a maximum 0.25 wt.% in the case of compact products, while for the porous ones, significantly augmented compressive strengths were revealed at all graphene amounts. The sintering ambient or the graphene addition did not interfere with the Luffa ability to generate 3D-channels-arrays at high temperatures. It can be concluded that both Luffa and graphene agents act as adjuvants under nitrogen ambient, and that their incorporation-ratio can be modulated to favorably fit certain foreseeable biomedical applications.

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“…Atmospheric oxygen results in high-temperature degradation of the PI structure. In contrast, in treatment under inert atmospheric conditions, the absence of an oxidising agent leads to the formation of a comparatively stable graphene structure [43][44][45].…”

Section: Lig Formation In the Nitrogen Atmospherementioning

confidence: 99%

Laser-Induced Graphene Formation on Polyimide Using UV to Mid-Infrared Laser Radiation

Fiodorov,

Trusovas,

Mockus

et al. 2023

Polymers

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Our study presents laser-assisted methods to produce conductive graphene layers on the polymer surface. Specimens were treated using two different lasers at ambient and nitrogen atmospheres. A solid-state picosecond laser generating 355 nm, 532 nm, or 1064 nm wavelengths and a CO2 laser generating mid-infrared 10.6 µm wavelength radiation operating in a pulsed regime were used in experiments. Sheet resistance measurements and microscopic analysis of treated sample surfaces were made. The chemical structure of laser-treated surfaces was investigated using Raman spectroscopy, and it showed the formation of high-quality few-layer graphene structures on the PI surface. The intensity ratios I(2D)/I(G) and I(D)/I(G) of samples treated with 1064 nm wavelength in nitrogen atmosphere were 0.81 and 0.46, respectively. After laser treatment, a conductive laser-induced graphene layer with a sheet resistance as low as 5 Ω was formed. Further, copper layers with a thickness of 3–10 µm were deposited on laser-formed graphene using a galvanic plating. The techniques of forming a conductive graphene layer on a polymer surface have a great perspective in many fields, especially in advanced electronic applications to fabricate copper tracks on 3D materials.

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Comparison of the effect of argon, hydrogen, and nitrogen gases on the reduced graphene oxide-hydroxyapatite nanocomposites characteristics

Cited by 6 publications

References 69 publications

Tuning Fabrication Factors for Reduced Graphene Oxide Forward Osmosis Membranes

Tuning Fabrication Factors for Reduced Graphene Oxide Forward Osmosis Membranes

Fiber-Templated 3D Calcium-Phosphate Scaffolds for Biomedical Applications: The Role of the Thermal Treatment Ambient on Physico-Chemical Properties

Laser-Induced Graphene Formation on Polyimide Using UV to Mid-Infrared Laser Radiation

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