1
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Effect of Process Parameters on the Graphite Expansion Produced by a Green Modification of the Hummers Method. Molecules 2022; 27:molecules27217399. [DOI: 10.3390/molecules27217399] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2022] [Revised: 10/11/2022] [Accepted: 10/24/2022] [Indexed: 11/06/2022] Open
Abstract
Adsorption stand out among other standard techniques used for water treatment because of its remarkable simplicity, easy operation, and high removal capability. Expanded graphite has been selected as a promising agent for oil spill adsorption, but its production involves the generation of corrosive remnants and massive amounts of contaminated washing waters. Although the advantageous use of the H2O2–H2SO4 mixture was described in 1978, reported works using this method are scarce. This work deals with the urgent necessity for the development of alternative chemical routes decreasing their environmental impact (based on green chemistry concepts), presenting a process for expanded graphite production using only two intercalation chemicals, reducing the consumption of sulfuric acid to only 10% and avoiding the use of strong oxidant salts (both environmentally detrimental). Three process parameters were evaluated: milling effect, peroxide concentration, and microwave expansion. Some remarkable results were obtained following this route: high specific volumes elevated oil adsorption rate exhibiting a high oil–water selectivity and rapid adsorption. Furthermore, the recycling capability was checked using up to six adsorption cycles. Results showed that milling time reduces the specimen’s expansion rate and oil adsorption capacity due to poor intercalant insertion and generation of small particle sizes.
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2
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Gürünlü B, Taşdelen-Yücedağ Ç, Bayramoğlu M. One Pot Synthesis of Graphene through Microwave Assisted Liquid Exfoliation of Graphite in Different Solvents. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27155027. [PMID: 35956975 PMCID: PMC9370801 DOI: 10.3390/molecules27155027] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/11/2022] [Revised: 07/31/2022] [Accepted: 08/03/2022] [Indexed: 11/16/2022]
Abstract
This study presents an easy and quick method for the synthesis of graphene from graphite in a set of solvents, including n-Hexadecane (n-Hexa), dimethylsulfoxide (DMSO), sodium hydroxide (NaOH), 1-octanol (OCTA), perchloric acid (PA), N,N-Dimethylformamide (DMF), ethylene glycol (EG), and ethylene diamine (ED), via microwave (MW) energy. The properties of final products were determined by X-ray diffraction spectroscopy (XRD), Fourier transform infrared spectroscopy (FTIR), ultraviolet-visible (UV-Vis) spectroscopy, and the four-point probe technique. The XRD spectra of most of the MW-assisted graphene products showed peaks at 2θ = 26.5° and 54°. Layer numbers extend from 2 and 25, and the leading comes about were gotten by having two-layered products, named as graphene synthesized in dimethylsulfoxide (G-DMSO), graphene synthesized in ethylene glycol (G-EG), and graphene synthesized in 1-octanol (G-OCTA). G-DMF has the highest electrical conductivity with 22 S/m. The electrical conductivity is higher when the dipole moment of the used solvent is between 2 and 4 Debye (D). The FTIR spectra of most of the MW-assisted graphene products are in line with commercial graphene (CG). The UV-Vis spectra of all MW-assisted graphene products showed a peak at 223 nm referring to characteristic sp2 C=C bonds and 273 nm relating to the n → π * transition of C-O bonds.
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Affiliation(s)
- Betül Gürünlü
- Bioengineering Department, Üsküdar University, Altunizade Mah. Üniversite Sok., Üsküdar, Istanbul 34662, Turkey
- Correspondence: ; Tel.: +90-544-354-9288
| | | | - Mahmut Bayramoğlu
- Chemical Engineering Department, Gebze Technical University, Gebze 41400, Turkey
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3
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Fernandes J, Nemala SS, De Bellis G, Capasso A. Green Solvents for the Liquid Phase Exfoliation Production of Graphene: The Promising Case of Cyrene. Front Chem 2022; 10:878799. [PMID: 35480388 PMCID: PMC9037782 DOI: 10.3389/fchem.2022.878799] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2022] [Accepted: 03/11/2022] [Indexed: 11/30/2022] Open
Abstract
The liquid phase exfoliation (LPE) of graphite has allowed to produce graphene materials on a large scale and at a reasonable cost. By this method, stable dispersions, inks and liquid suspensions containing atomic-thick graphene flakes with tailored concentrations can be produced, opening up applications in a wide range of cutting-edge technologies such as functional coatings, printed and flexible electronics, and composites. However, currently established LPE techniques raise several health and environmental risks, since unsafe and toxic solvents (such as NMP, DMF, and DMSO) are often regarded as the most effective liquid media for the process. Therefore, it appears necessary to unlock eco-friendly and sustainable methods for the production of graphene at an industrial scale. This review focuses on the latest developments in terms of green solvents for LPE production of graphene. We highlight the use of a new green solvent, Cyrene, and its performance when compared to conventional solvents.
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Affiliation(s)
- João Fernandes
- International Iberian Nanotechnology Laboratory, Braga, Portugal
| | | | - Giovanni De Bellis
- Department of Astronautical, Electrical and Energy Engineering, Sapienza University of Rome, Rome, Italy
- Research Center on Nanotechnology Applied to Engineering of Sapienza (CNIS), Sapienza University of Rome, Rome, Italy
| | - Andrea Capasso
- International Iberian Nanotechnology Laboratory, Braga, Portugal
- *Correspondence: Andrea Capasso,
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Abstract
Graphene is a unique attractive material owing to its characteristic structure and excellent properties. To improve the preparation efficiency of graphene, reduce defects and costs, and meet the growing market demand, it is crucial to explore the improved and innovative production methods and process for graphene. This review summarizes recent advanced graphene synthesis methods including “bottom-up” and “top-down” processes, and their influence on the structure, cost, and preparation efficiency of graphene, as well as its peeling mechanism. The viability and practicality of preparing graphene using polymers peeling flake graphite or graphite filling polymer was discussed. Based on the comparative study, it is potential to mass produce graphene with large size and high quality using the viscoelasticity of polymers and their affinity to the graphite surface.
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5
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Affiliation(s)
- Edward Furimsky
- IMAF Group, 184 Marlborough Avenue, Ottawa, Ontario, Canada K1N 8G4
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6
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Hajimohammadi M, Azizi N, Tollabimazraeno S, Tuna A, Duchoslav J, Knör G. Cobalt (II) Phthalocyanine Sulfonate Supported on Reduced Graphene Oxide (RGO) as a Recyclable Photocatalyst for the Oxidation of Aldehydes to Carboxylic Acids. Catal Letters 2020. [DOI: 10.1007/s10562-020-03287-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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7
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Yang J, Du K, Hu L, Wang D. Scalable Fabrication of Carbon Nanomaterials by Electrochemical Dual-Electrode Exfoliation of Graphite in Hydroxide Molten Salt. Ind Eng Chem Res 2020. [DOI: 10.1021/acs.iecr.0c01430] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Juan Yang
- School of Resource and Environmental Sciences, International Cooperation Base for Sustainable Utilization of Resources and Energy in Hubei Province, Wuhan University, Wuhan 430072, Hubei, P. R. China
| | - Kaifa Du
- School of Resource and Environmental Sciences, International Cooperation Base for Sustainable Utilization of Resources and Energy in Hubei Province, Wuhan University, Wuhan 430072, Hubei, P. R. China
| | - Liangyou Hu
- School of Resource and Environmental Sciences, International Cooperation Base for Sustainable Utilization of Resources and Energy in Hubei Province, Wuhan University, Wuhan 430072, Hubei, P. R. China
| | - Dihua Wang
- School of Resource and Environmental Sciences, International Cooperation Base for Sustainable Utilization of Resources and Energy in Hubei Province, Wuhan University, Wuhan 430072, Hubei, P. R. China
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8
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Wang T, Ouyang Z, Wang F, Liu Y. A review on graphene strain sensors based on fiber assemblies. SN APPLIED SCIENCES 2020. [DOI: 10.1007/s42452-020-2641-3] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
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9
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Mechanochemical versus chemical routes for graphitic precursors and their performance in micropollutants removal in water. POWDER TECHNOL 2020. [DOI: 10.1016/j.powtec.2020.02.073] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
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10
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Pozzetto S, Capone M, Cherubini N, Cozzella ML, Dodaro A, Guidi G. Proposal of a prototype plant based on the exfoliation process for the treatment of irradiated graphite. NUCLEAR ENGINEERING AND TECHNOLOGY 2020. [DOI: 10.1016/j.net.2019.09.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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11
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Xu D, Seery TAP, Gao Y, Ding L, Zhou C, Wang Z, Jiang Z, Zhang H. A series of novel high‐temperature‐resistant multiwall carbon nanotubes dispersants: Polyphenylene sulfones with pyrene groups in main chain. J Appl Polym Sci 2020. [DOI: 10.1002/app.48379] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Da Xu
- National and Local Joint Engineering Laboratory for Synthesis Technology of High‐Performance Polymer, Jilin University 2699 Qianjin Street, Changchun 130012 China
| | - Thomas A. P. Seery
- Institute of Materials Science University of Connecticut 97 N. Eagleville Road, Storrs Connecticut 06269‐3136
| | - Yanwei Gao
- National and Local Joint Engineering Laboratory for Synthesis Technology of High‐Performance Polymer, Jilin University 2699 Qianjin Street, Changchun 130012 China
| | - Lianjun Ding
- National and Local Joint Engineering Laboratory for Synthesis Technology of High‐Performance Polymer, Jilin University 2699 Qianjin Street, Changchun 130012 China
| | - Chenyi Zhou
- National and Local Joint Engineering Laboratory for Synthesis Technology of High‐Performance Polymer, Jilin University 2699 Qianjin Street, Changchun 130012 China
| | - Zhaoyang Wang
- National and Local Joint Engineering Laboratory for Synthesis Technology of High‐Performance Polymer, Jilin University 2699 Qianjin Street, Changchun 130012 China
| | - Zilong Jiang
- National and Local Joint Engineering Laboratory for Synthesis Technology of High‐Performance Polymer, Jilin University 2699 Qianjin Street, Changchun 130012 China
| | - Haibo Zhang
- National and Local Joint Engineering Laboratory for Synthesis Technology of High‐Performance Polymer, Jilin University 2699 Qianjin Street, Changchun 130012 China
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Abstract
Unexpectedly bright photoluminescence emission can be observed in materials incorporating inorganic carbon when their size is reduced from macro–micro to nano. At present, there is no consensus in its understanding, and many suggested explanations are not consistent with the broad range of experimental data. In this Review, I discuss the possible role of collective excitations (excitons) generated by resonance electronic interactions among the chromophore elements within these nanoparticles. The Förster-type resonance energy transfer (FRET) mechanism of energy migration within nanoparticles operates when the composing fluorophores are the localized electronic systems interacting at a distance. Meanwhile, the resonance interactions among closely located fluorophores may lead to delocalization of the excited states over many molecules resulting in Frenkel excitons. The H-aggregate-type quantum coherence originating from strong coupling among the transition dipoles of adjacent chromophores in a co-facial stacking arrangement and exciton transport to emissive traps are the basis of the presented model. It can explain most of the hitherto known experimental observations and must stimulate the progress towards their versatile applications.
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Lionetto F, López-Muñoz R, Espinoza-González C, Mis-Fernández R, Rodríguez-Fernández O, Maffezzoli A. A Study on exfoliation of Expanded Graphite Stacks in Candelilla Wax. MATERIALS (BASEL, SWITZERLAND) 2019; 12:E2530. [PMID: 31398950 PMCID: PMC6721147 DOI: 10.3390/ma12162530] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/27/2019] [Revised: 07/30/2019] [Accepted: 08/01/2019] [Indexed: 12/14/2022]
Abstract
A novel, green route for pre-exfoliation of graphite based on a biodegradable polymer and high-power ultrasound is presented. Candelilla wax (CW), derived from the leaves of the candelilla plant, has been used for the first time as a natural non aqueous medium to induce the pre-exfoliation of expanded graphite (EG) under ultrasonic irradiation in an economical way. The proposed method uses also D-limonene as a natural organic solvent for reducing viscosity and increasing the affinity between the polar groups of EG and candelilla wax, thus improving the intercalation/exfoliation of EG. The quality of dispersion of the nanofiller in the natural wax matrix has been evaluated using multiple techniques. The addition of EG to wax and use of ultrasonic treatment leads to a reduced crystallinity, probably due to restrictions of the molecular movements, improved thermal stability of wax, and to an increased shear thinning exponent, which are all indicative of a high degree of EG dispersion. The ultrasonic dynamic mechanical results suggest a reduction in the cluster size and a better filler dispersion in the wax matrix promoted by polar or chemical reactions between the CW fractions and the graphite stacks, which was observed by XPS analysis. The results were compared to those obtained with paraffin, a synthetic wax, and confirmed the dispersion improvement obtained by using natural wax as a pre-exfoliating medium.
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Affiliation(s)
- Francesca Lionetto
- Department of Mathematics and Physics "Ennio De Giorgi", University of Salento, Via per Arnesano, 73100 Lecce, Italy
| | - Roberto López-Muñoz
- Department of Advanced Materials, Research Center for Applied Chemistry (CIQA), Blvd. Enrique Reyna 140, 25294 Saltillo, Mexico
| | - Carlos Espinoza-González
- Department of Advanced Materials, Research Center for Applied Chemistry (CIQA), Blvd. Enrique Reyna 140, 25294 Saltillo, Mexico.
| | - Ricardo Mis-Fernández
- Applied Physics Department, CINVESTAV-IPN, Apdo. Postal 73, 97310 Mérida, Yucatán, Mexico
| | - Oliverio Rodríguez-Fernández
- Department of Advanced Materials, Research Center for Applied Chemistry (CIQA), Blvd. Enrique Reyna 140, 25294 Saltillo, Mexico
| | - Alfonso Maffezzoli
- Department of Engineering for Innovation, University of Salento, Via per Monteroni, 73100 Lecce, Italy.
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14
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15
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Giglio CS, Osazuwa O, Kontopoulou M, Docoslis A. Achieving high yield of graphene nanoplatelets in poloxamer-assisted ultrasonication of graphite in water. J Colloid Interface Sci 2019; 539:107-117. [PMID: 30576986 DOI: 10.1016/j.jcis.2018.12.033] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2018] [Revised: 12/07/2018] [Accepted: 12/08/2018] [Indexed: 12/07/2022]
Abstract
The role of surfactant (Pluronic® F 127) concentration on the yield and morphological characteristics of graphene nanoplatelets (GNPs) produced from the sonication of aqueous graphene suspensions is investigated in this work. By employing a wide surfactant concentration range (0.1-15 wt%) and sonication power densities up to 420 W L-1 we identify two graphene exfoliation regimes: the first occurs at low sonication power densities (<340 W L-1) and produces GNPs with sizes 200-300 nm, aspect ratios between 70 and 100, and concentrations up 1 mg mL-1. In that regime, the surfactant concentration has no effect on the exfoliation results. In the second exfoliation regime (>340 W L-1), surfactant concentrations greater than 10 wt% produce dramatic increases in GNP yields, namely up to 3.0 mg mL-1, and overall larger GNPs (350-500 nm) with smaller aspect ratios (5-60). We attribute these changes to the onset of a more energy intensive mechanism, termed cleavage. Cleavage involves the separation of graphite clusters in sub-bulk multi-layered graphene entities, as opposed to exfoliation, which involves the separation of individual or few-layer GNPs. Choosing an exfoliation regime by tuning simple process parameters enables control over the yield, size and morphology of the produced GNPs.
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Affiliation(s)
- Cameron S Giglio
- Department of Chemical Engineering, Queen's University, Kingston, Ontario K7L 3N6, Canada
| | - Osayuki Osazuwa
- Department of Chemical Engineering, Queen's University, Kingston, Ontario K7L 3N6, Canada
| | - Marianna Kontopoulou
- Department of Chemical Engineering, Queen's University, Kingston, Ontario K7L 3N6, Canada
| | - Aristides Docoslis
- Department of Chemical Engineering, Queen's University, Kingston, Ontario K7L 3N6, Canada.
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16
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GdVO4 modified fluorine doped graphene nanosheets as dispersed photocatalyst for mitigation of phenolic compounds in aqueous environment and bacterial disinfection. Sep Purif Technol 2019. [DOI: 10.1016/j.seppur.2018.08.077] [Citation(s) in RCA: 120] [Impact Index Per Article: 24.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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17
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Wang B, Iocozzia J, Zhang M, Ye M, Yan S, Jin H, Wang S, Zou Z, Lin Z. The charge carrier dynamics, efficiency and stability of two-dimensional material-based perovskite solar cells. Chem Soc Rev 2019; 48:4854-4891. [DOI: 10.1039/c9cs00254e] [Citation(s) in RCA: 98] [Impact Index Per Article: 19.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Recent advances in the use of two-dimensional (2D) materials for perovskites solar cells (PSCs) are summarized. The effects of their unique optical and electrical properties on the charge carrier dynamics of PSCs are detailed.
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Affiliation(s)
- Bing Wang
- School of Materials Science and Engineering
- Georgia Institute of Technology
- Atlanta
- USA
| | - James Iocozzia
- School of Materials Science and Engineering
- Georgia Institute of Technology
- Atlanta
- USA
| | - Meng Zhang
- School of Materials Science and Engineering
- Georgia Institute of Technology
- Atlanta
- USA
| | - Meidan Ye
- Research Institute for Biomimetics and Soft Matter
- Fujian Provincial Key Laboratory for Soft Functional Materials Research
- Department of Physics
- Xiamen University
- Xiamen, 361005
| | - Shicheng Yan
- Eco-materials and Renewable Energy Research Center
- National Laboratory of Solid State Microstructures
- College of Engineering and Applied Sciences
- Nanjing University
- Nanjing 210093
| | - Huile Jin
- Nano-materials & Chemistry Key Laboratory
- Institute of New Materials and Industrial Technologies
- Wenzhou University
- Wenzhou
- P. R. China
| | - Shun Wang
- Nano-materials & Chemistry Key Laboratory
- Institute of New Materials and Industrial Technologies
- Wenzhou University
- Wenzhou
- P. R. China
| | - Zhigang Zou
- Eco-materials and Renewable Energy Research Center
- National Laboratory of Solid State Microstructures
- College of Engineering and Applied Sciences
- Nanjing University
- Nanjing 210093
| | - Zhiqun Lin
- School of Materials Science and Engineering
- Georgia Institute of Technology
- Atlanta
- USA
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18
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Tiwari P, Kaur N, Sharma V, Mobin SM. High-yield graphene produced from the synergistic effect of inflated temperature and gelatin offers high stability and cellular compatibility. Phys Chem Chem Phys 2018; 20:20096-20107. [PMID: 30024577 DOI: 10.1039/c8cp02263a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
The direct exfoliation of graphite (Gr) is highly desirable and feasible compared to conventional processes owing to its non-oxidative, facile and controlled synthesis conditions. Herein, gelatin (gel), a hydrolysed form of collagen, was used as an exfoliant to directly exfoliate Gr. The main advantages of exploring gel as an exfoliant is its easy availability, low cost and high biocompatibility, which alleviate the drawbacks of previous exfoliation methods. The effect of the exfoliation parameters such as temperature, ratio of interacting species and pH of the solution offers a high yield of graphene (G) with the added advantages of good solubility, easy dispersibility and high stability. The temperature elevation caused by the dissipation of sonic waves facilitates a high exfoliation yield. Yield of 4.37 mg mL-1 of G was achieved under the conditions of 7 h sonication at 60 °C, pH 7 and Gr to gel ratio of 60 : 40, whereas yield of 1 mg mL-1 was achieved under sonication at 30 °C. Raman spectroscopy and transmission electron microscopy indicated the production of G sheets with 3-5 layers. The adsorption of gel on the surface of G via π-π interactions offers high stability and retains its inherent crystallinity. The as-synthesized G dispersion exhibits good cyto- and hemocompatibility. Unlike graphene oxide, the G dispersion does not affect RBCs at a relatively high concentration of 10 mg mL-1. These findings offer new avenues for the large-scale production of G and promote its biomedical applications, particularly in scaffold materials and intravenous drug delivery.
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Affiliation(s)
- Pranav Tiwari
- Discipline of Metallurgical Engineering and Material Science, Indian Institute of Technology Indore, Simrol, Khandwa Road, Indore 453552, India.
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19
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Stafford J, Patapas A, Uzo N, Matar OK, Petit C. Towards scale-up of graphene production via nonoxidizing liquid exfoliation methods. AIChE J 2018. [DOI: 10.1002/aic.16174] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Jason Stafford
- Dept. of Chemical Engineering; Imperial College London; Kensington London SW7 2AZ U.K
| | - Andrius Patapas
- Dept. of Chemical Engineering; Imperial College London; Kensington London SW7 2AZ U.K
| | - Nwachukwu Uzo
- Dept. of Chemical Engineering; Imperial College London; Kensington London SW7 2AZ U.K
| | - Omar K. Matar
- Dept. of Chemical Engineering; Imperial College London; Kensington London SW7 2AZ U.K
| | - Camille Petit
- Dept. of Chemical Engineering; Imperial College London; Kensington London SW7 2AZ U.K
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20
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Zhang J, Liu J, Zhang Y, Yu F, Wang F, Peng Z, Li Y. Voltammetric lidocaine sensor by using a glassy carbon electrode modified with porous carbon prepared from a MOF, and with a molecularly imprinted polymer. Mikrochim Acta 2017; 185:78. [DOI: 10.1007/s00604-017-2551-2] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2017] [Accepted: 11/09/2017] [Indexed: 10/18/2022]
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21
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Affiliation(s)
- Edward Furimsky
- IMAF Group, 184 Marlborough
Avenue, Ottawa, Ontario, Canada K1N 8G4
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22
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Gaska K, Kádár R, Rybak A, Siwek A, Gubanski S. Gas Barrier, Thermal, Mechanical and Rheological Properties of Highly Aligned Graphene-LDPE Nanocomposites. Polymers (Basel) 2017; 9:E294. [PMID: 30970972 PMCID: PMC6432036 DOI: 10.3390/polym9070294] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2017] [Revised: 07/17/2017] [Accepted: 07/18/2017] [Indexed: 11/16/2022] Open
Abstract
This contribution reports on properties of low-density polyethylene-based composites filled with different amounts of graphene nanoplatelets. The studied samples were prepared in the form of films by means of the precoating technique and single screw melt-extrusion, which yields a highly ordered arrangement of graphene flakes and results in a strong anisotropy of composites morphology. The performed tests of gas permeability reveal a drastic decrease of this property with increasing filler content. A clear correlation is found between permeability and free volume fraction in the material, the latter evaluated by means of positron annihilation spectroscopy. A strong anisotropy of the thermal conductivity is also achieved and the thermal conductivity along the extrusion direction for samples filled with 7.5 wt % of GnP (graphene nanoplatelets) reached 2.2 W/m·K. At the same time, when measured through a plane, a slight decrease of thermal conductivity is found. The use of GnP filler leads also to improvements of mechanical properties. The increase of Young's modulus and tensile strength are reached as the composites become more brittle.
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Affiliation(s)
- Karolina Gaska
- Department of Electrical Engineering, Chalmers University of Technology, 41296 Gothenburg, Sweden.
| | - Roland Kádár
- Department of Industrial and Materials Science, Chalmers University of Technology, 41296 Gothenburg, Sweden.
| | - Andrzej Rybak
- ABB Corporate Research Center, 31038 Krakow, Poland.
| | - Artur Siwek
- ABB Corporate Research Center, 31038 Krakow, Poland.
| | - Stanislaw Gubanski
- Department of Electrical Engineering, Chalmers University of Technology, 41296 Gothenburg, Sweden.
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Martіnez-Flores R, Camporredondo-Saucedo JE, Moreno-C H, Gonzalez-Zamarripa G, Corona-Romo M, Brostow W, Hagg Lobland HE. MESOPHASE MICROSPHERES FROM DISTILLATION AND THERMAL TREATMENT OF COAL TAR. CHEMISTRY & CHEMICAL TECHNOLOGY 2017. [DOI: 10.23939/chcht11.02.230] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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24
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Highly sensitive electrochemical sensor for chloramphenicol based on MOF derived exfoliated porous carbon. Talanta 2017; 167:39-43. [DOI: 10.1016/j.talanta.2017.01.078] [Citation(s) in RCA: 74] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2016] [Revised: 01/20/2017] [Accepted: 01/26/2017] [Indexed: 11/15/2022]
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25
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Affiliation(s)
- Maocong Hu
- Department of Chemical, Biological
and Pharmaceutical Engineering, New Jersey Institute of Technology, Newark, New Jersey 07102, United States
| | - Zhenhua Yao
- Department of Chemical, Biological
and Pharmaceutical Engineering, New Jersey Institute of Technology, Newark, New Jersey 07102, United States
| | - Xianqin Wang
- Department of Chemical, Biological
and Pharmaceutical Engineering, New Jersey Institute of Technology, Newark, New Jersey 07102, United States
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26
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Tiwari N, Agarwal N, Roy D, Mukhopadhyay K, Prasad NE. Tailor Made Conductivities of Polymer Matrix for Thermal Management: Design and Development of Three-Dimensional Carbonaceous Nanostructures. Ind Eng Chem Res 2017. [DOI: 10.1021/acs.iecr.6b03245] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Neeru Tiwari
- Directorate
of Nanomaterials and Technologies, DMSRDE, GT Road, Kanpur, India-208013
| | - Neha Agarwal
- Directorate
of Nanomaterials and Technologies, DMSRDE, GT Road, Kanpur, India-208013
| | - Debmalya Roy
- Directorate
of Nanomaterials and Technologies, DMSRDE, GT Road, Kanpur, India-208013
| | - Kingsuk Mukhopadhyay
- Directorate
of Nanomaterials and Technologies, DMSRDE, GT Road, Kanpur, India-208013
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Lavin-Lopez MP, Fernandez-Diaz M, Sanchez-Silva L, Valverde JL, Romero A. Improving the growth of monolayer CVD-graphene over polycrystalline iron sheets. NEW J CHEM 2017. [DOI: 10.1039/c7nj00281e] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A high quality graphene film, mostly composed of monolayer graphene, was successfully grown on polycrystalline iron foil by atmospheric CVD process using methane as carbonaceous source.
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Affiliation(s)
| | - M. Fernandez-Diaz
- University of Castilla-La Mancha
- Department of Chemical Engineering
- Ciudad Real
- Spain
| | - L. Sanchez-Silva
- University of Castilla-La Mancha
- Department of Chemical Engineering
- Ciudad Real
- Spain
| | - J. L. Valverde
- University of Castilla-La Mancha
- Department of Chemical Engineering
- Ciudad Real
- Spain
| | - A. Romero
- University of Castilla-La Mancha
- Department of Chemical Engineering
- Ciudad Real
- Spain
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Varenik M, Green MJ, Regev O. Distinguishing Self-Assembled Pyrene Structures from Exfoliated Graphene. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:10699-10704. [PMID: 27723350 DOI: 10.1021/acs.langmuir.6b03379] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Sonication-assisted graphene production from graphite is a popular lab-scale approach in which ultrasound energy breaks down graphite sheets into graphene flakes in aqueous medium. Dispersants (surfactant molecules) are incorporated into the solution to prevent individual graphene flakes from reaggregating. However, in solution these dispersants self-assemble into various structures, which can interfere with the characterization of the graphene produced. In this study, we characterized graphene dispersions stabilized by a family of pyrene-based surfactants that facilitate a high exfoliation yield. These surfactants self-assembled to form flakes and ribbons-shapes very similar to those of graphene structures. The dispersant structures were present both in the graphene dispersion and in the precipitate after the solvent had been evaporated and could therefore have been mistakenly identified as graphene by electron microscopy techniques and other characterization techniques, such as Raman and X-ray photoelectron spectroscopy. Contrary to previous reports, we showed-by removing the dispersants by filtration and washing-that the surfactants did not affect the shape of the graphene prepared by sonication.
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Affiliation(s)
| | - Micah J Green
- Artie McFerrin Department of Chemical Engineering, Texas A&M University , College Station, Texas 77843-3122, United States
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