Strong and conductive reduced graphene oxide/polyester resin composite films with improved mechanical strength, thermal stability and its antibacterial activity

The reduced graphene oxide reinforced silicone-acrylate resin composite films (rGO/SAR composite films) were prepared by in situ synthesis method. The structure of rGO/SAR composite films was characterized by Raman spectrum, atomic force microscope, scanning electron microscopy, and thermogravimetric analyzer. The results showed that the rGO were uniformly dispersed in silicone-acrylate resin matrix. Furthermore, the effect of rGO loading on mechanical properties of composite films was investigated by bulge test. A significant enhancement (ca. 290% and 320%) in Young’s modulus and yield stress was obtained by adding the rGO to silicone-acrylate resin. At the same time, the adhesive energy between the composite films and metal substrate was also improved to be about 200%. Moreover, the erosion resistance of the composite films was also investigated as function of rGO loading. The rGO had great effect on the erosion resistance of the composite films, in which theRcorr(ca. 0.8 mm/year) of composite film was far lower than that (28.7 mm/year) of pure silicone-acrylate resin film. Thus, this approach provides a novel route to investigate mechanical stability of polymer composite films and improve erosion resistance of polymer coating, which are very important to be used in mechanical-corrosion coupling environments.

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The utilization of a three-dimensional reduced graphene oxide and montmorillonite composite aerogel as a multifunctional agent for wastewater treatment

RSC Advances ◽

10.1039/c7ra13103h ◽

2018 ◽

Vol 8 (8) ◽

pp. 4239-4248 ◽

Cited By ~ 16

Author(s):

Yunyun Zhang ◽

Xueru Yan ◽

Yayuan Yan ◽

Dengjie Chen ◽

Langhuan Huang ◽

...

Keyword(s):

Antibacterial Activity ◽

Wastewater Treatment ◽

Graphene Oxide ◽

Mechanical Strength ◽

Reduced Graphene Oxide ◽

Three Dimensional ◽

High Adsorption ◽

Composite Aerogel ◽

Reduced Graphene

A reduced graphene oxide/montmorillonite aerogel has high adsorption and antibacterial activity, and excellent recyclable properties thanks to its outstanding mechanical strength.

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Preparation of reduced graphene oxide/gelatin composite films with reinforced mechanical strength

Materials Research Bulletin ◽

10.1016/j.materresbull.2012.05.060 ◽

2012 ◽

Vol 47 (9) ◽

pp. 2245-2251 ◽

Cited By ~ 28

Author(s):

Wenchao Wang ◽

Zhipeng Wang ◽

Yu Liu ◽

Nan Li ◽

Wei Wang ◽

...

Keyword(s):

Graphene Oxide ◽

Mechanical Strength ◽

Reduced Graphene Oxide ◽

Composite Films ◽

Reduced Graphene

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Direct growth of thermally reduced graphene oxide on carbon fiber for enhanced mechanical strength

Composites Part B Engineering ◽

10.1016/j.compositesb.2020.108010 ◽

2020 ◽

Vol 193 ◽

pp. 108010

Author(s):

Beom-Gon Cho ◽

Shalik Ram Joshi ◽

Jaekyo Lee ◽

Young-Bin Park ◽

Gun-Ho Kim

Keyword(s):

Graphene Oxide ◽

Carbon Fiber ◽

Mechanical Strength ◽

Reduced Graphene Oxide ◽

Reduced Graphene ◽

Direct Growth

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Green Synthesis of Reduced Graphene Oxide-Supported Palladium Nanoparticles by Coleus amboinicus and Its Enhanced Catalytic Efficiency and Antibacterial Activity

Crystals ◽

10.3390/cryst11020134 ◽

2021 ◽

Vol 11 (2) ◽

pp. 134

Author(s):

Koduru Mallikarjuna ◽

Lebaka Veeranjaneya Reddy ◽

Sarah Al-Rasheed ◽

Arifullah Mohammed ◽

Sreedevi Gedi ◽

...

Keyword(s):

Antibacterial Activity ◽

Graphene Oxide ◽

Reduced Graphene Oxide ◽

Palladium Nanoparticles ◽

Catalytic Efficiency ◽

Tem Analysis ◽

Reduced Graphene ◽

Supported Palladium ◽

Medical Disciplines ◽

Coleus Amboinicus

Novel reduced graphene oxide-supported palladium nanoparticles (RGO-PN) were synthesized under ultrasonication, a method that utilizes Coleus amboinicus as a bio-reduction agent. Green synthesized RGO-PN nanoparticles with a crystallite size in the range of 40–50 nm were confirmed in X-ray diffraction (XRD) spectra. RGO-PN show an absorption peak at 220 nm while reduced graphene oxide (RGO) shows its maximal absorbance at 210 nm. The scanning electron microscope image revealed that 40-nm-sized spherical-shaped palladium nanoparticles stick well to reduced graphene oxide sheets, which is consistent and correlated well with the XRD pattern. Moreover, a high-resolution morphological image of RGO-PN100 was obtained by TEM analysis, which shows the anchoring of palladium nanoparticles (PN) on RGO nanosheets. Green synthesized RGO-PN100 nanoparticles from Coleus amboinicus show better reduction kinetics for 4-nitrophenol at 40 min, suggesting that RGO-PN prepared from Coleus amboinicus serve as an excellent catalytic reducing agent. Furthermore, they show remarkable antibacterial activity against Escherichia coli (ATCC 25922). Thus, green synthesized RGO-supported palladium nanoparticles demonstrated that enhanced catalytic activity and antibacterial activity both play an important role in the environmental and medical disciplines.

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Protein immobilization on graphene oxide or reduced graphene oxide surface and their applications: Influence over activity, structural and thermal stability of protein

Advances in Colloid and Interface Science ◽

10.1016/j.cis.2021.102367 ◽

2021 ◽

Vol 289 ◽

pp. 102367

Author(s):

Karan Chaudhary ◽

Krishan Kumar ◽

Pannuru Venkatesu ◽

Dhanraj T. Masram

Keyword(s):

Thermal Stability ◽

Graphene Oxide ◽

Reduced Graphene Oxide ◽

Protein Immobilization ◽

Oxide Surface ◽

Reduced Graphene ◽

Thermal Stability Of

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Facile one pot microbe-mediated in situ synthesis and antibacterial activity of reduced graphene oxide-silver nanocomposite

Nanotechnology ◽

10.1088/1361-6528/ac4521 ◽

2021 ◽

Author(s):

Ashwini Patil

Keyword(s):

Antibacterial Activity ◽

Graphene Oxide ◽

Zeta Potential ◽

Reduced Graphene Oxide ◽

In Vitro Dissolution ◽

Size Analysis ◽

X Ray ◽

Reduced Graphene

Abstract The present research deals with the development of a novel bioinspired in situ fabrication of reduced graphene oxide (rGO)-silver nanoparticle (AgNPs) nanocomposite (rGO@AgNCs) using microbes namely Pseudomonas aeruginosa (PA) and Staphylococcus aureus (SA). The fabricated rGO@AgNCs were characterized using Ultraviolet-visible (UV) spectroscopy, Fourier-transform infrared spectroscopy (FTIR), particle size analysis, polydispersity index (PDI), zeta potential analysis, energy dispersive X-ray analysis (EDAX), Raman spectroscopy, powder X-ray diffraction (PXRD), high-resolution transmission electron microscopy (HR-TEM) analysis, etc. Furthermore, the rGO@AgNCs-PA and rGO@AgNCs-SA interaction with serum protein, pH stability study, and in vitro dissolution of AgNPs were also performed. The research findings of the proposed study demonstrated the simultaneous reduction of graphene oxide (GO) and AgNPs and the formation of rGO@AgNCs in the presence of microbes. The in vitro dissolution studies of rGO@AgNCs composites showed better AgNPs dissolution with controlled release and offered remarkable matrix integrity throughout the dissolution period. The size and stability of rGO@AgNCs-PA and rGO@AgNCs-SA had no significant changes at physiological pH 7.4. A minimal decrease in the zeta potential of rGO@AgNCs was observed, which may be due to the weak interaction of nanocomposites and albumin. The antibacterial application of the synthesized nanocomposite was evaluated against a pathogenic mastitis-forming bacterium. The obtained results suggested an admirable antibacterial activity of synthesized nanocomposites against the tested microbes. This knowledge will assist the scientific fraternity in designing novel antibacterial agents with enhanced antibacterial activity against various veterinary pathogens in near future.

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Synthesis and investigation of thermal properties of PMMA-maleimide-functionalized reduced graphene oxide nanocomposites

Journal of Thermoplastic Composite Materials ◽

10.1177/0892705718804595 ◽

2018 ◽

Vol 33 (1) ◽

pp. 85-96

Author(s):

Thangamani Rajkumar ◽

Nagamuthu Muthupandiyan ◽

Chinnaswamy Thangavel Vijayakumar

Keyword(s):

Thermal Stability ◽

Graphene Oxide ◽

Reduced Graphene Oxide ◽

Chemical Interaction ◽

Weight Percent ◽

Bulk Polymerization ◽

Pmma Matrix ◽

Uniform Dispersion ◽

Reduced Graphene ◽

Thermal Stability Of

Reduced graphene oxide (RGEO) and N-[4-(chlorocarbonyl)phenyl]maleimide-functionalized reduced graphene oxide (MFRGEO) were used as nanofillers for polymethyl methacrylate (PMMA) matrix nanocomposites to enhance thermal stability. Methyl methacrylate containing nanofiller of four different weight percent (0.2, 0.4, 0.6, and 0.8) was polymerized using ultrasonic radiation-assisted bulk polymerization. The Fourier-transform infrared spectra showed the absence of chemical interaction between the filler and the matrix phase. Morphology of nanocomposites studied using scanning electron microscope confirmed the assistance aided by ultrasonication in the uniform dispersion of nanofiller in the PMMA matrix. Thermogravimetric (TG) study revealed the presence of MFRGEO enhanced the thermal stability of PMMA by shifting the entire degradation to higher temperature. The thermal stability of PMMA nanocomposite was improved by as much as 40°C at just 0.8 wt% loading of MFRGEO. Differential TG study also supported the role of maleimide functionalization on RGEO in the enhancement of thermal stability of PMMA by means of retarding the degradation rate of unsaturated chain ends in the PMMA matrix. Unlike MFRGEO, RGEO failed to enhance the thermal stability of PMMA.

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