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Journal articles on the topic 'Functionalized Graphenes'

Author: Grafiati

Published: 18 May 2024

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1

Tene, Talia, Stefano Bellucci, Marco Guevara, Fabian Arias Arias, Miguel Ángel Sáez Paguay, John Marcos Quispillo Moyota, Melvin Arias Polanco, et al. "Adsorption of Mercury on Oxidized Graphenes." Nanomaterials 12, no. 17 (August 31, 2022): 3025. http://dx.doi.org/10.3390/nano12173025.

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Graphene oxide (GO) and its reduced form, reduced graphene oxide (rGO), are among the most predominant graphene derivatives because their unique properties make them efficient adsorbent nanomaterials for water treatment. Although extra-functionalized GO and rGO are customarily employed for the removal of pollutants from aqueous solutions, the adsorption of heavy metals on non-extra-functionalized oxidized graphenes has not been thoroughly studied. Herein, the adsorption of mercury(II) (Hg(II)) on eco-friendly-prepared oxidized graphenes is reported. The work covers the preparation of GO and rGO as well as their characterization. In a further stage, the description of the adsorption mechanism is developed in terms of the kinetics, the associated isotherms, and the thermodynamics of the process. The interaction between Hg(II) and different positions of the oxidized graphene surface is explored by DFT calculations. The study outcomes particularly demonstrate that pristine rGO has better adsorbent properties compared to pristine GO and even other extra-functionalized ones.

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2

Tene, Talia, Fabian Arias Arias, Marco Guevara, Juan Carlos González García, Melvin Arias Polanco, Andrea Scarcello, Lorenzo S. Caputi, Stefano Bellucci, and Cristian Vacacela Gomez. "Adsorption Kinetics of Hg(II) on Eco-Friendly Prepared Oxidized Graphenes." Coatings 12, no. 8 (August 10, 2022): 1154. http://dx.doi.org/10.3390/coatings12081154.

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Extra-functionalized oxidized graphenes are widely preferred for the removal of different pollutants, however, removal with pristine oxidized graphenes, i.e., graphene oxide (GO) and reduced graphene oxide (rGO) is vaguely explored. Herein, we report a comparative adsorption kinetics study of the removal of mercury(II) (Hg(II)) from water using eco-friendly prepared GO and rGO. This work consists of the synthesis protocol and the corresponding morphological and spectroscopical characterization of the obtained pristine adsorbents as well as the adsorption mechanism in terms of initial concentration, removal percentage, pseudo-first and pseudo-second-order models, intraparticle diffusion study, and pH analysis. In particular, scanning electron microscope (SEM) and transmission electron microscope (TEM) images evidence the presence of thin sheets with some defects on the GO structure, these defects substantially disappear in rGO, after reduction. Raman spectrum of rGO shows a less intense D* peak which is attributed to the diamond-like carbon phase. Most importantly, the equilibrium adsorption time in GO is 10 min with a removal percentage of ~28% while in rGO it is 20 min with a removal percentage of ~75%. The adsorption process of Hg(II) either in GO or rGO is more in line with the pseudo-second-order model, suggesting that the adsorption kinetics could be controlled by chemisorption. Our results evidence the interesting adsorbing properties of pristine oxidized graphenes and are expected to be useful for the proposal and study of non-extra functionalized graphene-based materials for water treatment.

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3

Xu, Hangxun, and Kenneth S. Suslick. "Sonochemical Preparation of Functionalized Graphenes." Journal of the American Chemical Society 133, no. 24 (June 22, 2011): 9148–51. http://dx.doi.org/10.1021/ja200883z.

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4

Moon, Hyun Gon, and Jin Hae Chang. "Syntheses and Characterizations of Functionalized Graphenes and Reduced Graphene Oxide." Polymer Korea 35, no. 3 (May 31, 2011): 265–71. http://dx.doi.org/10.7317/pk.2011.35.3.265.

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5

Mojica-Sánchez, Juan Pablo, Víctor Manuel Langarica-Rivera, Kayim Pineda-Urbina, Jorge Nochebuena, Gururaj Kudur Jayaprakash, and Zeferino Gómez Sandoval. "Adsorption of glyphosate on graphene and functionalized graphenes: A DFT study." Computational and Theoretical Chemistry 1215 (September 2022): 113840. http://dx.doi.org/10.1016/j.comptc.2022.113840.

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6

Hu, Bo, Lingdi Liu, Yanxu Zhao, and Changli Lü. "A facile construction of quaternized polymer brush-grafted graphene modified polysulfone based composite anion exchange membranes with enhanced performance." RSC Advances 6, no. 56 (2016): 51057–67. http://dx.doi.org/10.1039/c6ra06363b.

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Novel quaternized polymer brush-functionalized graphenes (QPbGs) were synthesized and a series of composite anion exchange membranes for alkaline fuel cells were fabricated by incorporating different amounts of QPbGs into quaternized polysulfone.

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7

Heo, Cheol, and Jin-Hae Chang. "Syntheses and Characterizations of Position Specific Functionalized Graphenes." Polymer Korea 37, no. 2 (March 25, 2013): 218–24. http://dx.doi.org/10.7317/pk.2013.37.2.218.

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8

Huang, Wenyi, Xilian Ouyang, and L. James Lee. "High-Performance Nanopapers Based on Benzenesulfonic Functionalized Graphenes." ACS Nano 6, no. 11 (October 29, 2012): 10178–85. http://dx.doi.org/10.1021/nn303917p.

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9

Li, Yuanzhen, Liying Zhang, and Chao Wu. "Uncertainty in the separation properties of functionalized porous graphenes." Applied Surface Science 525 (September 2020): 146524. http://dx.doi.org/10.1016/j.apsusc.2020.146524.

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10

Tene, Talia, Stefano Bellucci, Marco Guevara, Edwin Viteri, Malvin Arias Polanco, Orlando Salguero, Eder Vera-Guzmán, et al. "Cationic Pollutant Removal from Aqueous Solution Using Reduced Graphene Oxide." Nanomaterials 12, no. 3 (January 18, 2022): 309. http://dx.doi.org/10.3390/nano12030309.

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Reduced graphene oxide (rGO) is one of the most well-known graphene derivatives, which, due to its outstanding physical and chemical properties as well as its oxygen content, has been used for wastewater treatment technologies. Particularly, extra functionalized rGO is widely preferred for treating wastewater containing dyes or heavy metals. Nevertheless, the use of non-extra functionalized (pristine) rGO for the removal of cationic pollutants is not explored in detail or is ambiguous. Herein, pristine rGO—prepared by an eco-friendly protocol—is used for the removal of cationic pollutants from water, i.e., methylene blue (MB) and mercury-(II) (Hg-(II)). This work includes the eco-friendly synthesis process and related spectroscopical and morphological characterization. Most importantly, the investigated rGO shows an adsorption capacity of 121.95 mg g−1 for MB and 109.49 mg g−1 for Hg (II) at 298 K. A record adsorption time of 30 min was found for MB and 20 min for Hg (II) with an efficiency of about 89% and 73%, respectively. The capture of tested cationic pollutants on rGO exhibits a mixed physisorption–chemisorption process. The present work, therefore, presents new findings for cationic pollutant adsorbent materials based on oxidized graphenes, providing a new perspective for removing MB molecules and Hg(II) ions.

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11

Prasitnok, Khongvit, and Orrasa In‐noi. "Functionalized graphenes as nanofillers for polylactide: Molecular dynamics simulation study." Polymer Composites 41, no. 1 (August 20, 2019): 294–305. http://dx.doi.org/10.1002/pc.25369.

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12

Steurer, Peter, Rainer Wissert, Ralf Thomann, and Rolf Mülhaupt. "Functionalized Graphenes and Thermoplastic Nanocomposites Based upon Expanded Graphite Oxide." Macromolecular Rapid Communications 30, no. 4-5 (February 18, 2009): 316–27. http://dx.doi.org/10.1002/marc.200800754.

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13

Rezayi, Majid, Pegah Mahmoodi, Hadis Langari, Behzad Behnam, and Amirhossein Sahebkar. "Conjugates of Curcumin with Graphene and Carbon Nanotubes: A Review on Biomedical Applications." Current Medicinal Chemistry 27, no. 40 (November 26, 2020): 6849–63. http://dx.doi.org/10.2174/0929867326666191113145745.

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In the last decade, the use of carbon nanotubes and graphenes has been on the rise for various nanobiotechnological applications. Owing to their special characteristics, these two nanostructures of carbon allotropes have been studied for their capacity in the detection and treatment of many diseases. On the other hand, curcumin, a well-known antioxidant and anticancer natural product, is being extensively studied for numerous medicinal applications. Interestingly, many reports have shown great potentials of conjugates of curcumin and carbon nanotubes or graphenes. These conjugates, when properly designed and functionalized with biomolecules, could represent the valuable properties of each component alone while they could be effective in overcoming the poor solubility issues of both curcumin and Carbon Nanomaterials (CNMs). In this case, curcumin conjugates with CNMs seem to be very promising in biosensing applications and the detection of many biomolecules, especially, curcumin has been reported to be very effective with these conjugates. Also, the delivery of curcumin using functionalized SWCNTs was evaluated for its ability to load and release curcumin, to protect curcumin from degradation and to enhance its solubility. It is proposed that other properties of these conjugates are still to be discovered and the interdisciplinary approaches among biology, medicine, chemistry, and material engineering will accelerate the applications of these novel materials. This review aims to summarize the findings on the applications of CNM conjugates of curcumin.

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14

Tachikawa, Hiroto, and Hiroshi Kawabata. "Electronic states of aryl radical functionalized graphenes: Density functional theory study." Japanese Journal of Applied Physics 55, no. 6S1 (April 26, 2016): 06GK05. http://dx.doi.org/10.7567/jjap.55.06gk05.

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15

Patel, Sanjay V., Stephen T. Hobson, Sabina Cemalovic, and William K. Tolley. "Comparing Selectivity of Functionalized Graphenes Used for Chemiresistive Hydrocarbon Vapor Detection." ACS Applied Nano Materials 1, no. 8 (July 13, 2018): 4092–100. http://dx.doi.org/10.1021/acsanm.8b00852.

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16

Whitby, Raymond L. D., Alina V. Korobeinyk, Vladimir M. Gun’ko, Daniel B. Wright, Gennaro Dichello, Lauren C. Smith, Takahiro Fukuda, Toru Maekawa, Julian R. Thorpe, and Sergey V. Mikhalovsky. "Single-Layer Graphenes Functionalized with Polyurea: Architectural Control and Biomolecule Reactivity." Journal of Physical Chemistry C 117, no. 22 (May 22, 2013): 11829–36. http://dx.doi.org/10.1021/jp4022213.

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17

Zhao, Yang, Hua Bai, Yue Hu, Yan Li, Liangti Qu, Shaowen Zhang, and Gaoquan Shi. "Electrochemical deposition of polyaniline nanosheets mediated by sulfonated polyaniline functionalized graphenes." Journal of Materials Chemistry 21, no. 36 (2011): 13978. http://dx.doi.org/10.1039/c1jm12014j.

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18

Collins, William R., Wiktor Lewandowski, Ezequiel Schmois, Joseph Walish, and Timothy M. Swager. "Claisen Rearrangement of Graphite Oxide: A Route to Covalently Functionalized Graphenes." Angewandte Chemie International Edition 50, no. 38 (August 8, 2011): 8848–52. http://dx.doi.org/10.1002/anie.201101371.

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19

Yadav, Santosh Kumar, Yong Chae Jung, Jin Hee Kim, Yong-Il Ko, Hee Jeong Ryu, Mukesh Kumar Yadav, Yoong Ahm Kim, and Jae Whan Cho. "Mechanically Robust, Electrically Conductive Biocomposite Films Using Antimicrobial Chitosan-Functionalized Graphenes." Particle & Particle Systems Characterization 30, no. 8 (June 20, 2013): 721–27. http://dx.doi.org/10.1002/ppsc.201300044.

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20

Collins, William R., Wiktor Lewandowski, Ezequiel Schmois, Joseph Walish, and Timothy M. Swager. "Claisen Rearrangement of Graphite Oxide: A Route to Covalently Functionalized Graphenes." Angewandte Chemie 123, no. 38 (August 8, 2011): 9010–14. http://dx.doi.org/10.1002/ange.201101371.

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21

Fu, Yu, Linshu Liu, Jinwen Zhang, and William C. Hiscox. "Functionalized graphenes with polymer toughener as novel interface modifier for property-tailored polylactic acid/graphene nanocomposites." Polymer 55, no. 24 (November 2014): 6381–89. http://dx.doi.org/10.1016/j.polymer.2014.10.014.

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22

Choi, Bong Gill, Jinkee Hong, Young Chul Park, Doo Hwan Jung, Won Hi Hong, Paula T. Hammond, and HoSeok Park. "Innovative Polymer Nanocomposite Electrolytes: Nanoscale Manipulation of Ion Channels by Functionalized Graphenes." ACS Nano 5, no. 6 (May 6, 2011): 5167–74. http://dx.doi.org/10.1021/nn2013113.

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23

Park, Solmon, and Dae Su Kim. "Preparation and physical properties of an epoxy nanocomposite with amine-functionalized graphenes." Polymer Engineering & Science 54, no. 5 (November 22, 2012): 985–91. http://dx.doi.org/10.1002/pen.23368.

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24

Salgado-Delgado, Areli Marlen, Elizabeth Grissel González-Mondragón, Ricardo Hernández-Pérez, René Salgado-Delgado, José Alfonso Santana-Camilo, and Alfredo Olarte-Paredes. "Obtention and Characterization of GO/Epoxy and GO-GPTMS/Epoxy Nanocompounds with Different Oxidation Degrees and Ultrasound Methods." C 9, no. 1 (March 1, 2023): 28. http://dx.doi.org/10.3390/c9010028.

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This work reports the obtention of nanocompounds from epoxy resin (EP) with graphenes at three different oxidation degrees (GO1, GO2, and GO3), functionalized with 3-glycidyloxypropyl trimethoxysilane (GPTMS), and three different graphene concentrations (1%, 2%, and 3%). The aim is to improve GO compatibility in EP and obtain a nanocompound with synergistic properties. Ultrasonic bath was used to disperse the GO, a factor in the effective interaction between GO and the polymeric matrix. The nanocompounds were characterized by FTIR, SEM, and mechanical tension testing. The FTIR analysis evidenced stretching bonds created during the functionalization of graphene oxide (GO) with the silane (GPTMS); they are characteristic Si-O-Si and Si-O-C at 1000 and 1085 cm−1, respectively. There was a difference between GO and GO-GPTMS nanocompounds regarding the formation of these signals. The SEM micrographs showed morphological changes when GO was added: the smooth fracture surface of EP became rougher. During tension testing, Young’s modulus (2.09 GPa) of GO2-GPTMS/epoxy nanocompounds (1% weight GO) increased by 35% while their resistance to traction (98.71 MPa) grew by 52%; both were higher than in pure EP. In conclusion, the variables studied (oxidation degrees and silanization) significantly affect the mechanical properties studied.

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25

Beckert, Fabian, Christian Friedrich, Ralf Thomann, and Rolf Mülhaupt. "Sulfur-Functionalized Graphenes as Macro-Chain-Transfer and RAFT Agents for Producing Graphene Polymer Brushes and Polystyrene Nanocomposites." Macromolecules 45, no. 17 (August 30, 2012): 7083–90. http://dx.doi.org/10.1021/ma301379z.

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26

Chen, Y. R., K. F. Chiu, H. C. Lin, C. Y. Hsieh, C. B. Tsai, and B. T. T. Chu. "The effect of dispersion status with functionalized graphenes for electric double-layer capacitors." Materials Science and Engineering: B 190 (December 2014): 59–65. http://dx.doi.org/10.1016/j.mseb.2014.09.011.

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27

Zhao, Li-fen, Qi Li, Ru-liang Zhang, Xiu-juan Tian, and Lei Liu. "Effects of functionalized graphenes on the isothermal crystallization of poly(L-lactide) nanocomposites." Chinese Journal of Polymer Science 34, no. 1 (November 13, 2015): 111–21. http://dx.doi.org/10.1007/s10118-016-1732-5.

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28

Li, Yaping, Zhijun Xu, Shuyan Liu, Jinwen Zhang, and Xiaoning Yang. "Molecular simulation of reverse osmosis for heavy metal ions using functionalized nanoporous graphenes." Computational Materials Science 139 (November 2017): 65–74. http://dx.doi.org/10.1016/j.commatsci.2017.07.032.

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29

Marsoner Steinkasserer, Lukas Eugen, Alessandra Zarantonello, and Beate Paulus. "Strong 1D localization and highly anisotropic electron–hole masses in heavy-halogen functionalized graphenes." Physical Chemistry Chemical Physics 18, no. 36 (2016): 25629–36. http://dx.doi.org/10.1039/c6cp05188j.

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30

Pop, Raluca, and Dušanka Janežič. "Interactions of Indomethacin with Functionalized Rhombellanes – a Molecular Docking Study." Croatica chemica acta 92, no. 4 (2020): 503–9. http://dx.doi.org/10.5562/cca3591.

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The specific properties of carbon-based nanomaterials like fullerenes and graphenes have attracted a continuous interest for their possible use as drug carriers. The functionalization of these nanomaterials can lead to the variation or improvement of the required properties, in order to lead to the design of the most suitable compounds within a specific field. In this regard, the possible use of a new class of nanostructures -the rhombellanes- as nanocarriers is investigated. The aim of the paper is to study the interactions of indomethacin and four analogues with anti-inflammatory activity on 13 rhombellanes (three of them with a hyper-adamantane motif, Ada-rbl, three cube-rhombellane homeomorphs, C-rbl, and seven cube-rhombellane-ether/amine structures). Five compounds with anti-inflammatory activity have been docked to the surface of the rhombellanes; comparisons with the results obtained for fullerene C60 have been performed. The best binding affinities for the indomethacin and its derivatives have been obtained for two types of rhombellanes, Ada-rbl and C-rbl. The indomethacin analogue I4 shows an increased binding affinity for C-rbl.420, similar to the value obtained for C60. Best results have been obtained for rhombellane derivatives characterized by smaller HOMO-LUMO gaps.

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31

Zhang, Zhongtao, and C. Heath Turner. "Redox Properties of Graphenes Functionalized with Cyclopentadiene–Transition Metal Complexes: A Potential Redox-Active Material." Journal of Physical Chemistry C 118, no. 42 (October 10, 2014): 24633–40. http://dx.doi.org/10.1021/jp508279n.

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32

Luo, Tianlie, Jingwen Chen, Bo Song, Hua Ma, Zhiqiang Fu, and Willie J. G. M. Peijnenburg. "Time-gated luminescence imaging of singlet oxygen photoinduced by fluoroquinolones and functionalized graphenes in Daphnia magna." Aquatic Toxicology 191 (October 2017): 105–12. http://dx.doi.org/10.1016/j.aquatox.2017.07.016.

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33

Baik, Ku Youn, Jinsung Choi, Hyeseon Gwon, Jaewon Cho, Yun Ki Kim, Pankaj Attri, Un Jeong Kim, and Ranju Jung. "Adhesion and differentiation of human mesenchymal stem cells on plasma-functionalized graphenes with different feeding gases." Carbon 77 (October 2014): 302–10. http://dx.doi.org/10.1016/j.carbon.2014.05.033.

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34

Zarafu, Irina, Ioana Turcu, Daniela Culiță, Simona Petrescu, Marcela Popa, Mariana Chifiriuc, Carmen Limban, Alexandra Telehoiu, and Petre Ioniță. "Antimicrobial Features of Organic Functionalized Graphene-Oxide with Selected Amines." Materials 11, no. 9 (September 13, 2018): 1704. http://dx.doi.org/10.3390/ma11091704.

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(1) Background: Graphene oxide is a new carbon-based material that contains functional groups (carboxyl, hydroxyl, carbonyl, epoxy) and therefore can be easily functionalized with organic compounds of interest, yielding hybrid materials with important properties and applications. (2) Methods: Graphene oxide has been obtained by a modified Hummers method and activated by thionyl chloride in order to be covalently functionalized with amines. Thus obtained hybrid materials were characterized by infrared and Raman spectroscopy, elemental analysis and scanning electron microscopy and then tested for their antimicrobial and anti-biofilm activity. (3) Results: Eight amines of interest were used to functionalize grapheme oxide and the materials thus obtained were tested against Gram-negative (Escherichia coli, Pseudomonas aeruginosa) and Gram-positive (Staphylococcus aureus) bacterial strainsin plankonic and biofilm growth state. Both amines, as well as the functionalized materials, exhibited anti-microbial features. Three to five functionalized graphene oxide materials exhibited improved inhibitory activity against planktonic strains as compared with the respective amines. In exchange, the amines alone proved generally more efficient against biofilm-embedded cells. (4) Conclusions: Such hybrid materials may have a wide range of potential use in biomedical applications.

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35

Luo, Jheng-Hua, Zih-Siang Hong, Tzu-Hsuan Chao, and Mu-Jeng Cheng. "Quantum Mechanical Screening of Metal-N4-Functionalized Graphenes for Electrochemical Anodic Oxidation of Light Alkanes to Oxygenates." Journal of Physical Chemistry C 123, no. 31 (July 16, 2019): 19033–44. http://dx.doi.org/10.1021/acs.jpcc.9b04803.

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36

Muraru, Sebastian, Cosmin G. Samoila, Emil I. Slusanschi, Jorge S. Burns, and Mariana Ionita. "Molecular Dynamics Simulations of DNA Adsorption on Graphene Oxide and Reduced Graphene Oxide-PEG-NH2 in the Presence of Mg2+ and Cl− ions." Coatings 10, no. 3 (March 20, 2020): 289. http://dx.doi.org/10.3390/coatings10030289.

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Graphene and its functionalised derivatives are transforming the development of biosensors that are capable of detecting nucleic acid hybridization. Using a Molecular Dynamics (MD) approach, we explored single-stranded or double-stranded deoxyribose nucleic acid (ssDNA or dsDNA) adsorption on two graphenic species: graphene oxide (GO) and reduced graphene oxide functionalized with aminated polyethylene glycol (rGO-PEG-NH2). Innovatively, we included chloride (Cl−) and magnesium (Mg2+) ions that influenced both the ssDNA and dsDNA adsorption on GO and rGO-PEG-NH2 surfaces. Unlike Cl−, divalent Mg2+ ions formed bridges between the GO surface and DNA molecules, promoting adsorption through electrostatic interactions. For rGO-PEG-NH2, the Mg2+ ions were repulsed from the graphenic surface. The subsequent ssDNA adsorption, mainly influenced by electrostatic forces and hydrogen bonds, could be supported by π–π stacking interactions that were absent in the case of dsDNA. We provide a novel insight for guiding biosensor development.

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37

Zhang, Zhongtao, and C. Heath Turner. "Structural and Electronic Properties of Carbon Nanotubes and Graphenes Functionalized with Cyclopentadienyl–Transition Metal Complexes: A DFT Study." Journal of Physical Chemistry C 117, no. 17 (April 17, 2013): 8758–66. http://dx.doi.org/10.1021/jp312232t.

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38

Guo, Xiaoyao, Qin Wei, Bin Du, Yakun Zhang, Xiaodong Xin, Liangguo Yan, and Haiqin Yu. "Removal of basic dyes (malachite green) from aqueous medium by adsorption onto amino functionalized graphenes in batch mode." Desalination and Water Treatment 53, no. 3 (October 7, 2013): 818–25. http://dx.doi.org/10.1080/19443994.2013.846239.

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39

Cheng, Mu-Jeng. "(Invited) Quantum Mechanical Screening of Metal-N4-Functionalized Graphenes for Electrochemical Anodic Oxidation of Light Alkanes to Oxygenates." ECS Meeting Abstracts MA2020-01, no. 50 (May 1, 2020): 2746. http://dx.doi.org/10.1149/ma2020-01502746mtgabs.

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40

Yadav, Santosh Kumar, Yong Chae Jung, Jin Hee Kim, Yong-Il Ko, Hee Jeong Ryu, Mukesh Kumar Yadav, Yoong Ahm Kim, and Jae Whan Cho. "Biocomposites: Mechanically Robust, Electrically Conductive Biocomposite Films Using Antimicrobial Chitosan-Functionalized Graphenes (Part. Part. Syst. Charact. 8/2013)." Particle & Particle Systems Characterization 30, no. 8 (August 2013): 648. http://dx.doi.org/10.1002/ppsc.201370031.

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41

Guo, Xiaoyao, Qin Wei, Bin Du, Yakun Zhang, Xiaodong Xin, Liangguo Yan, and Haiqin Yu. "Removal of Metanil Yellow from water environment by amino functionalized graphenes (NH2-G) – Influence of surface chemistry of NH2-G." Applied Surface Science 284 (November 2013): 862–69. http://dx.doi.org/10.1016/j.apsusc.2013.08.023.

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42

Tian, Weiqian, Qiuming Gao, Yanli Tan, Yunlu Zhang, Jiandong Xu, Zeyu Li, Kai Yang, Lihua Zhu, and Zhengping Liu. "Three-dimensional functionalized graphenes with systematical control over the interconnected pores and surface functional groups for high energy performance supercapacitors." Carbon 85 (April 2015): 351–62. http://dx.doi.org/10.1016/j.carbon.2015.01.001.

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43

Arnold, Anne M., Brian D. Holt, Leila Daneshmandi, Cato T. Laurencin, and Stefanie A. Sydlik. "Phosphate graphene as an intrinsically osteoinductive scaffold for stem cell-driven bone regeneration." Proceedings of the National Academy of Sciences 116, no. 11 (February 22, 2019): 4855–60. http://dx.doi.org/10.1073/pnas.1815434116.

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Synthetic, resorbable scaffolds for bone regeneration have potential to transform the clinical standard of care. Here, we demonstrate that functional graphenic materials (FGMs) could serve as an osteoinductive scaffold: recruiting native cells to the site of injury and promoting differentiation into bone cells. By invoking a Lewis acid-catalyzed Arbuzov reaction, we are able to functionalize graphene oxide (GO) to produce phosphate graphenes (PGs) with unprecedented control of functional group density, mechanical properties, and counterion identity. In aqueous environments, PGs release inducerons, including Ca2+ and PO43−. Calcium phosphate graphene (CaPG) intrinsically induces osteogenesis in vitro and in the presence of bone marrow stromal cells (BMSCs), can induce ectopic bone formation in vivo. Additionally, an FGM can be made by noncovalently loading GO with the growth factor recombinant human bone morphogenetic protein 2 (rhBMP-2), producing a scaffold that induces ectopic bone formation with or without BMSCs. The FGMs reported here are intrinsically inductive scaffolds with significant potential to revolutionize the regeneration of bone.

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44

Au, Heather, Noelia Rubio, and Milo S. P. Shaffer. "Brominated graphene as a versatile precursor for multifunctional grafting." Chemical Science 9, no. 1 (2018): 209–17. http://dx.doi.org/10.1039/c7sc03455e.

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A non-destructive and versatile chemical reduction method was used to dissolve and subsequently brominate few-layer graphene sheets (FLGs). The brominated FLGs provide a convenient precursor for the synthesis of a variety of directly functionalised graphenes.

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45

Abbas, S. S., and T. McNally. "Composites of Cysteamine Functionalised Graphene Oxide and Polypropylene." International Polymer Processing 36, no. 3 (July 1, 2021): 297–313. http://dx.doi.org/10.1515/ipp-2020-4079.

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Abstract Cysteamine functionalised reduced graphene oxide (rGO) was grafted to polypropylene-graft-maleic anhydride (PP-g-MA) and subsequently melt blended with PP. The covalent bridging of rGO to PP-g-MA via the cysteamine molecule and co-crystallization are routes to promoting interfacial interactions between rGO and the PP matrix. A rheological percolation threshold was achieved for a nanofiller loading between 3 wt% and 5 wt%, but none detected for the composites prepared with un-functionalized rGO. At low loadings (0.1 wt%), functionalized rGO is well dispersed in the PP matrix, an interconnecting filler-filler, polymer-filler and polymer-polymer network is formed, resulting in increased tensile toughness (1 500%) and elongation at break (40%) relative to neat PP. Irrespective of whether the rGO was functionalised or not, it had a significant effect on the crystallization behavior of PP, inducing heterogeneous nucleation, increasing the crystallisation temperature (Tm) of PP by up to 10°C and decreasing the crystalline content (Xc) by ∼30% for the highest (5 wt%) filler loading. The growth of the monoclinic a-phase of PP is preferred on addition of functionalised rGO and b crystal growth suppressed.

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Xie, Quanling, Shishen Zhang, Zhuan Hong, Hanjun Ma, Birong Zeng, Xiao Gong, Wenyao Shao, and Qiuquan Wang. "A novel double-modified strategy to enhance the performance of thin-film nanocomposite nanofiltration membranes: Incorporating functionalized graphenes into supporting and selective layers." Chemical Engineering Journal 368 (July 2019): 186–201. http://dx.doi.org/10.1016/j.cej.2019.02.180.

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Chen, Duoli, Chaoliang Gan, Xiaoqiang Fan, Lin Zhang, Wen Li, Minhao Zhu, and Xin Quan. "Improving the Dynamic Mechanical Properties of XNBR Using ILs/KH550-Functionalized Multilayer Graphene." Materials 12, no. 17 (August 30, 2019): 2800. http://dx.doi.org/10.3390/ma12172800.

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Graphene has been considered an ideal nanoscale reinforced phase for preparing high-performance composites, but the poor compatibility and weak interfacial interaction with the matrix have limited its application. Here a highly effective and environmentally friendly method for the functionalization of graphene is proposed through an interaction between as-exfoliated graphene and (3-aminopropyl) triethoxysilane (KH550), in which 1-butylsulfonate-3-methylimidazolium bisulfate (BSO3HMIm)(HSO4) ionic-liquids-modified graphene was prepared via an electrochemical exfoliation of graphite in (BSO3HMIm)(HSO4) solution, then (BSO3HMIm)(HSO4)-modified graphene as a precursor was reacted with amine groups of KH550 for obtaining (BSO3HMIm)(HSO4)/KH550-functionalized graphene. The final products as filler into carboxylated acrylonitrile‒butadiene rubber (XNBR) improve the dynamic mechanical properties. The improvement in the dynamic mechanical properties of the nanocomposite mainly depends on high interfacial interaction and graphene’s performance characteristics, as well as a good dispersion between functionalized graphene and the XNBR matrix.

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Zhao, C. H., X. P. Zhang, and L. Zhang. "RGD peptide functionalized graphene oxide: a bioactive surface for cell-material interactions." Digest Journal of Nanomaterials and Biostructures 17, no. 3 (September 25, 2022): 989–97. http://dx.doi.org/10.15251/djnb.2022.173.989.

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Recently, functionalized graphene-based nanomaterials have gained tremendous attention in biomedical field owing to their biocompatibility, surface functionalizability and their unique mechanical, electronic, and optical properties. Herein, we report a facile one step modification of graphene oxide by RGD peptide, which is known to improve the tissue– material contact by highly specific binding to cellular membrane receptors known as integrins. A detailed structural and morphological characterization of the obtained RGD functionalized graphene oxide (GO-RGD) was performed. The synthesized bioactive composite was used to prepare RGD-GO films by a vacuum filtration method. Additionally, mouse osteoblastic cell (MC3T3-E1) functions including cell attachment, adhesion, proliferation, and differentiation were investigated on GO-RGD films. The results indicated that MC3T3-E1 cell functions were significantly enhanced on GO-RGD films comparing with GO films without functionalization. This study not only demonstrates a facile approach to functionalize graphene oxide with bioactive peptides, but also provides a potential biomaterial for bone repair by improving osteoblastic cell functions.

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Ma, Baoguang, Cheng Chen, Xiaojun Xie, Yanhui Chen, Qiuyu Zhang, Dong Lv, and Zhenguo Liu. "Aminobenzoic acid functionalized graphene oxide as environment-friendly corrosion inhibitors for Q235 steel in HCl solution: experimental and DFT studies." Anti-Corrosion Methods and Materials 68, no. 3 (June 7, 2021): 229–37. http://dx.doi.org/10.1108/acmm-03-2021-2449.

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Purpose The purpose of this study is to provide effective and environmental-friendly corrosion inhibitors derived from graphene oxide for Q235 steel. Design/methodology/approach Nontoxic and environment-friendly 4-aminobenzoic acid was used to functionalize graphene oxide via amidation and diazotization. The obtained amidation 4-aminobenzoic acid functionalized graphene oxide (PAGO) and diazotization 4-aminobenzoic acid functionalized graphene oxide (PDGO) were characterized by FTIR, Raman and TEM, while the inhibition efficiencies were analyzed by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization (PDP). Furthermore, theoretical inhibition efficiencies were investigated by density functional theory (DFT) approach. Findings At a concentration of 40 ppm, the maximum inhibition efficiency of PAGO and PDGO were 97.90% and 96.72% in EIS measurement, respectively, which were in accordance with PDP data. Moreover, experimental results were supported by DFT-based quantum chemical calculation. Originality/value Environmental-friendly PAGO and PDGO were synthesized successfully. The synthetic inhibitors exhibited excellent inhibition efficiencies in EIS and PDP measurements. Furthermore, a computational study using DFT supported the trend that PAGO was better inhibitor than PDGO.

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Mo, Xiaoju, Yan Wei, Xuehui Zhang, Qing Cai, Yang Shen, Xiaohan Dai, Song Meng, et al. "Enhanced Stem Cell Osteogenic Differentiation by Bioactive Glass Functionalized Graphene Oxide Substrates." Journal of Nanomaterials 2016 (2016): 1–11. http://dx.doi.org/10.1155/2016/5613980.

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An unmet need in engineered bone regeneration is to develop scaffolds capable of manipulating stem cells osteogenesis. Graphene oxide (GO) has been widely used as a biomaterial for various biomedical applications. However, it remains challenging to functionalize GO as ideal platform for specifically directing stem cell osteogenesis. Herein, we report facile functionalization of GO with dopamine and subsequent bioactive glass (BG) to enhance stem cell adhesion, spreading, and osteogenic differentiation. On the basis of graphene, we obtained dopamine functionalized graphene oxide/bioactive glass (DGO/BG) hybrid scaffolds containing different content of DGO by loading BG nanoparticles on graphene oxide surface using sol-gel method. To enhance the dispersion stability and facilitate subsequent nucleation of BG in GO, firstly, dopamine (DA) was used to modify GO. Then, the modified GO was functionalized with bioactive glass (BG) using sol-gel method. The adhesion, spreading, and osteoinductive effects of DGO/BG scaffold on rat bone marrow mesenchymal stem cells (rBMSCs) were evaluated. DGO/BG hybrid scaffolds with different content of DGO could influence rBMSCs’ behavior. The highest expression level of osteogenic markers suggests that the DGO/BG hybrid scaffolds have great potential or elicit desired bone reparative outcome.

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