Dispersion of graphene using surfactant mixtures: Experimental and molecular dynamics simulation studies

Poorsargol, Mahdiyeh; Alimohammadian, Mahsa; Sohrabi, Beheshteh; Dehestani, Maryam

doi:10.1016/j.apsusc.2018.09.042

Cited by 71 publications

(42 citation statements)

References 56 publications

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“…Hence, the efficacy of adsorption and subsequently, surfactants' dispersing power are significantly affected by the surfactants' tail length. The longer tail shows more steric hindrance and high spatial volume, therefore providing great repulsive forces among different individual nanotubes [34]. Besides that, the surfactant could enhance the dispersion of nanotubes containing unsaturated bonds on their tail groups [34].…”

Section: Resultsmentioning

confidence: 99%

“…The OD growth curves of treated pathogens compared with different concentrations of modified DW and modified MW nanotubes in Figures 6 and 7. In general, CNTs in bundles form do not produce any damage to the pathogens [20,34]. This non-antimicrobial activity of CNTs can be attributed to the larger diameter of tubes and poor solubility in the suspension as compared to modified CNTs [35].…”

Section: Antimicrobial Activity Of Cntsmentioning

confidence: 99%

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Elucidation of Antimicrobial Activity of Non-Covalently Dispersed Carbon Nanotubes

et al. 2020

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Microorganisms have begun to develop resistance because of inappropriate and extensive use of antibiotics in the hospital setting. Therefore, it seems to be necessary to find a way to tackle these pathogens by developing new and effective antimicrobial agents. Carbon nanotubes (CNTs) have attracted growing attention because of their remarkable mechanical strength, electrical properties, and chemical and thermal stability for their potential applications in the field of biomedical as therapeutic and diagnostic nanotools. However, the impact of carbon nanotubes on microbial growth has not been fully investigated. The primary purpose of this research study is to investigate the antimicrobial activity of CNTs, particularly double-walled and multi-walled nanotubes on representative pathogenic strains such as Gram-positive bacteria Staphylococcus aureus, Gram-negative bacteria Pseudomonas aeruginosa, Klebsiella pneumoniae, and fungal strain Candida albicans. The dispersion ability of CNT types (double-walled and multi-walled) treated with a surfactant such as sodium dodecyl-benzenesulfonate (SDBS) and their impact on the microbial growth inhibition were also examined. A stock concentration 0.2 mg/mL of both double-walled and multi-walled CNTs was prepared homogenized by dispersing in surfactant solution by using probe sonication. UV-vis absorbance, Fourier transform infrared spectroscopy (FTIR), and transmission electron microscopy (TEM) were used for the characterization of CNTs dispersed in the surfactant solution to study the interaction between molecules of surfactant and CNTs. Later, scanning electron microscopy (SEM) was used to investigate how CNTs interact with the microbial cells. The antimicrobial activity was determined by analyzing optical density growth curves and viable cell count. This study revealed that microbial growth inhibited by non-covalently dispersed CNTs was both depend on the concentration and treatment time. In conclusion, the binding of surfactant molecules to the surface of CNTs increases its ability to disperse in aqueous solution. Non-covalent method of CNTs dispersion preserved their structure and increased microbial growth inhibition as a result. Multi-walled CNTs exhibited higher antimicrobial activity compared to double-walled CNTs against selected pathogens.

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Section: Resultsmentioning

confidence: 99%

Section: Antimicrobial Activity Of Cntsmentioning

confidence: 99%

Elucidation of Antimicrobial Activity of Non-Covalently Dispersed Carbon Nanotubes

et al. 2020

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“…Graphene has gained a significant amount of research interest in recent years; it has a large specific surface area that can effectively adsorb pollutants . Additionally, it has a π‐π conjugated structure composed of carbon atoms and has excellent conductivity . Therefore, graphene is widely used for photocatalysis with semiconductor materials.…”

Section: Introductionmentioning

confidence: 99%

Study on Catalytic Performance of rGH/Fe‐g‐C₃N₄ Photocatalysis‐Fenton Synergy System[1]

Jia

Wang

2019

ChemistrySelect

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Graphene and Fe‐g‐C3N4 were combined to form a three‐dimensional catalytic gel material with visible light response. The graphene gel enabled the rapid recovery of the catalyst and improved cycling performance. In this work, the co‐degradation efficiency of the rGH/Fe‐g‐C3N4 photocatalytic‐Fenton system was investigated using phenol to simulate organic pollutants. A phenol concentration of 20±0.1 mg L−1 could be completely degraded by the 10% rGH/Fe‐g‐C3N4 after 50 min, and the photocurrent was 5.1 times and 1.8 times larger than that of g‐C3N4 and Fe‐g‐C3N4, respectively. In this system, the reaction of photogenerated electrons with Fe3+ promotes the rapid transfer of photogenerated charges. Additionally, Fe2+ participates in the Fenton reaction to rapidly form ⋅OH to promote cycling of the Fe valence state. Moreover, the π‐π conjugated graphene accelerates the transfer of electrons and results in the direct reduction of H2O2 to form ⋅OH. Furthermore, compared with the powder Fe‐g‐C3N4 catalyst, 10% rGH/Fe‐g‐C3N4 showed excellent recoverability and cyclability. After seven cycles, the degradation efficiency reached >86±1%. Finally, a degradation experiment with coking wastewater was carried out under optimized conditions. After 60 min, the COD and TOC values decreased from 67.8±1 mg L−1 and 21.6±0.2 mg L−1, to 21.6±1 mg L−1 and 6.7±0.2 mg L−1, respectively.

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“…Adjusting surface tension of solution in the region of 40-50 mN/m is determined as a main parameter for achieving high yield of graphene dispersion 56 . To adjust surface tension, various liquids and surfactants are used [55][56][57][58][59][60] . In our previous work, the graphene was dispersed in two different surfactants and also their mixture 59 .…”

mentioning

confidence: 99%

“…To adjust surface tension, various liquids and surfactants are used [55][56][57][58][59][60] . In our previous work, the graphene was dispersed in two different surfactants and also their mixture 59 . In this study, in order to reach the surface tension ~45 mN/m, the ratio of 20:80 ethanol/water was used ( Supplementary Fig.…”

mentioning

confidence: 99%

Manipulating electronic structure of graphene for producing ferromagnetic graphene particles by Leidenfrost effect-based method

Alimohammadian

Sohrabi

2020

Sci Rep

Self Cite

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first isolation of graphene, as a great achievement, opens a new horizon in a broad range of science. Graphene is one of the most promising materials for spintronic fields whose application is limited due to its weak magnetic property. Despite many experimental and theoretical efforts for obtaining ferromagnetic graphene, still, a high degree of magnetization is an unsolved challenge. even, in most observations, graphene magnetization is reported at extremely low temperatures rather than room temperature. in principle, the magnetic property of graphene is created by manipulation of its electronic structure. Removing or adding bonds of graphene such as creating vacancy defects, doping, adatom, edges, and functionalization can change the electronic structure and the external perturbation, such as external magnetic field, temperature, and strain can either. Recently, single and few-layer graphene have been investigated in the presence of these perturbations, and also the electronic changes have been determined by Raman spectroscopy. Here, we successfully could develop a simple and novel Leidenfrost effect-based method for graphene magnetization at room temperature with the external perturbations which apply simultaneously in the graphene flakes inside the Leidenfrost droplets. Macroscale ferromagnetic graphene particles are produced by this method. Briefly, the graphene is obtained by the liquid-phase exfoliation method in the ethanol solution media and also evaporates on the hot surface as a Leidenfrost droplet in the magnetic fields. Then, the floated graphene flakes circulate inside the droplets. Due to the strain and temperature inside the droplets and external magnetic field (the magnet in heater-stirrer), the electronic structure of graphene is instantly changed. The changes are extremely rapid that the graphene flakes behave as a charged particle and also produce an internal magnetic field during their circulation. The internal magnetic field is measured by sensors. As the main accomplishment of this study, we could develop a simple method for inducing magnetism obtained 0.4 emu/g in the graphene, as magnetization saturation at room temperature, which is higher than the reported values. Another achievement of this work is the detection of the Leidenfrost droplets magnetic field, as an internal one which has obtained for the first time. To investigate magnetic graphene particles, the magnetization process, and the electronic structure of the vibrating sample magnetometer (VSM), magnetic field sensor, and Raman spectroscopy are used, respectively.Graphene as an ideal material have unique physical properties and extensive usages. The isolation of single-layer graphene in 2004 was a starting point for exploring its structure and properties 1 . For example, recent studies indicate that the monolayer graphene is optically transparent and can absorb ~2.3% of the visible light 2 , and also it is wetting-transparent to substrates such as copper, gold or silicon 3 . In both cases, transparency is reduced by increasing ...

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Dispersion of graphene using surfactant mixtures: Experimental and molecular dynamics simulation studies

Cited by 71 publications

References 56 publications

Elucidation of Antimicrobial Activity of Non-Covalently Dispersed Carbon Nanotubes

Elucidation of Antimicrobial Activity of Non-Covalently Dispersed Carbon Nanotubes

Study on Catalytic Performance of rGH/Fe‐g‐C₃N₄ Photocatalysis‐Fenton Synergy System[1]

Manipulating electronic structure of graphene for producing ferromagnetic graphene particles by Leidenfrost effect-based method

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Dispersion of graphene using surfactant mixtures: Experimental and molecular dynamics simulation studies

Cited by 71 publications

References 56 publications

Elucidation of Antimicrobial Activity of Non-Covalently Dispersed Carbon Nanotubes

Elucidation of Antimicrobial Activity of Non-Covalently Dispersed Carbon Nanotubes

Study on Catalytic Performance of rGH/Fe‐g‐C3N4 Photocatalysis‐Fenton Synergy System[1]

Manipulating electronic structure of graphene for producing ferromagnetic graphene particles by Leidenfrost effect-based method

Contact Info

Product

Resources

About

Study on Catalytic Performance of rGH/Fe‐g‐C₃N₄ Photocatalysis‐Fenton Synergy System[1]