Graphene oxide-cation interaction: Inter-layer spacing and zeta potential changes in response to various salt solutions

Baskoro, Febri; Wong, Chak-Bor; Kumar, Selvaraj Rajesh; Chang, Chia-Wei; Chen, Chien-Hao; Chen, Dave W.; Lue, Shingjiang Jessie

doi:10.1016/j.memsci.2018.03.006

Cited by 168 publications

(89 citation statements)

References 60 publications

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“…The presence of oxygen-containing groups such as carboxyl, hydroxyl and epoxy groups confirmed the oxidation process of GO. The corresponding FTIR peaks were similarly matched with those of a previous study [39]. As compared with GO, most of those functional groups of the GO peaks significantly decreased in GO-Ag NPs.…”

Section: Synthesis Of Go Ag Nps and Go-ag Npssupporting

confidence: 83%

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Synergistic Antibacterial Activity of Silver-Loaded Graphene Oxide towards Staphylococcus Aureus and Escherichia Coli

et al. 2020

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In this study, the physicochemical and surface properties of the GO–Ag composite promote a synergistic antibacterial effect towards both Gram-negative Escherichia coli (E. coli) and Gram-positive Staphylococcus aureus (S. Aureus) bacteria. GO–Ag NPs have a better bactericidal effect on E. coli (73%) and S. Aureus (98.5%) than pristine samples (pure Ag or GO). Transmission electron microscopy (TEM) confirms that the GO layers folded entire bacteria by attaching to the membrane through functional groups, while the Ag NPs penetrated the inner cell, thus damaging the cell membrane and leading to cell death. Cyclic voltammetry (CV) tests showed significant redox activity in GO–Ag NPs, enabling good catalytic performance towards H2O2 reduction. Strong reactive oxygen species (ROS) in GO–Ag NPs suggests that ROS might be associated with bactericidal activity. Therefore, the synergy between the physicochemical effect and ROS production of this material is proposed as the mechanism of its antibacterial activity.

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Section: Synthesis Of Go Ag Nps and Go-ag Npssupporting

confidence: 83%

“…GO was synthesized via the modified Hummer's method based on our previous work with slight modification [39]. In brief, 2 g graphite powder was dissolved in 300 mL H 2 SO 4 with continuous stirring for 10 min.…”

Section: Go Synthesismentioning

confidence: 99%

Synergistic Antibacterial Activity of Silver-Loaded Graphene Oxide towards Staphylococcus Aureus and Escherichia Coli

et al. 2020

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“…The functional groups of graphite and GO were analyzed using FTIR spectrum based on our results as shown in Figure 2. GO spectrum shows the characteristics absorption peaks of several oxygen-containing groups while there is no significant peaks were observed in the graphite [21]. GO spectrum demonstrate there is peak at 3401.0 cm -1 , suggesting a strong O-H bond and at peak 1759.0 cm -1 , indicating a C=O bond consistent with a previous report [22].…”

Section: Ftir and Xrd Study On Gosupporting

confidence: 86%

Effect of the Interaction of Graphene Oxide Nanoparticles on a Biological Model Cell Membrane

Hashim

Rafie

Ismail

et al. 2018

Eurasian J Anal Chem

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Understanding the interaction of graphene oxide (GO) with a lipid membrane is important for the development of tissue engineering and to advance graphene-based biology. In an effort to understand the GO-lipid membrane interaction, appropriate characterisation of GO structure was determined by using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR) and a field emission scanning electron microscope (FESEM). In this study, the lipids 1,2-dipalmitoyl-sn-glycero-3phosphocholine (DPPC) and 1,2-dioleoyl-sn-glycero-3-phosphocholine (DOPC) were used to produce a lipid vesicle with a conventional gentle hydration method and observed under transmission electron microscopy (TEM). Lipid vesicle-GO interactions were also investigated using dynamic light scattering (DLS) (Malvern Zeta) and TEM by focusing on the effect of the surface charge interactions and localisation of GO on the surface of the vesicle membrane. It was observed that the surface charge of the vesicles increased as the GO nanoparticle concentration increased, but for the low saturation lipid the surface charge remained high as the nanoparticle concentration increased. The localisation and positioning of the GO nanoparticles in the lipid vesicles were confirmed with TEM analysis.

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“…1h) 32 . These characterization results are consistent with previous literature reports 20,[31][32][33] .…”

Section: Resultsmentioning

confidence: 99%

Vertically Transported Graphene Oxide for High‐Performance Osmotic Energy Conversion

et al. 2020

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Reverse electrodialysis is a promising method to harvest the osmotic energy stored between seawater and freshwater, but it has been a long-standing challenge to fabricate permselective membranes with the power density surpassing the industry benchmark of 5.0 W m -2 for half a century. Herein, we report a vertically-oriented graphene oxide membranes (V-GOMs) with the combination of high ion selectivity and ultrafast ion permeation, whose permeation is three orders of magnitude higher than the extensively studied horizontally stacked GOMs (H-GOMs). By mixing artificial seawater and river water, we obtained an unprecedented high output power density of 10.6 W m -2 , outperforming all existing materials. Molecular dynamics (MD) simulations reveal the mechanism of the ultrafast transport in V-GOMs results from the quick entering of ions and the large accessible area as well as the apparent short diffusion paths in V-GOMs. These results will facilitate the practical application of

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Graphene oxide-cation interaction: Inter-layer spacing and zeta potential changes in response to various salt solutions

Cited by 168 publications

References 60 publications

Synergistic Antibacterial Activity of Silver-Loaded Graphene Oxide towards Staphylococcus Aureus and Escherichia Coli

Synergistic Antibacterial Activity of Silver-Loaded Graphene Oxide towards Staphylococcus Aureus and Escherichia Coli

Effect of the Interaction of Graphene Oxide Nanoparticles on a Biological Model Cell Membrane

Vertically Transported Graphene Oxide for High‐Performance Osmotic Energy Conversion

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