Novel Poly(l-lactide)/graphene oxide films with improved mechanical flexibility and antibacterial activity

2017 ◽  
Vol 507 ◽  
pp. 344-352 ◽  
Author(s):  
Zhijun Yang ◽  
Chen Sun ◽  
Liang Wang ◽  
Huixin Chen ◽  
Ji He ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Graphene Oxide ◽  
Oxide Films

scholarly journals Antimicrobial Effect of Chitosan Films on Food Spoilage Bacteria

2021 ◽  
Vol 22 (11) ◽  
pp. 5839
Author(s):  
Natalia Wrońska ◽  
Nadia Katir ◽  
Katarzyna Miłowska ◽  
Nisrine Hammi ◽  
Marta Nowak ◽  
...  
Keyword(s):  
Antibacterial Activity ◽  
Graphene Oxide ◽  
Metal Oxide ◽  
Oxide Films ◽  
Nanocomposite Films ◽  
Metal Oxide Films ◽  
Spoilage Bacteria ◽  
Modified Graphene Oxide ◽  
Chitosan Films ◽  
Modified Graphene

Synthetic materials commonly used in the packaging industry generate a considerable amount of waste each year. Chitosan is a promising feedstock for the production of functional biomaterials. From a biological point of view, chitosan is very attractive for food packaging. The purposes of this study were to evaluate the antibacterial activity of a set of chitosan-metal oxide films and different chitosan-modified graphene (oxide) films against two foodborne pathogens: Campylobacter jejuni ATCC 33560 and Listeria monocytogenes 19115. Moreover, we wanted to check whether the incorporation of antimicrobial constituents such as TiO2, ZnO, Fe2O3, Ag, and graphene oxide (GO) into the polymer matrices can improve the antibacterial properties of these nanocomposite films. Finally, this research helps elucidate the interactions of these materials with eukaryotic cells. All chitosan-metal oxide films and chitosan-modified graphene (oxide) films displayed improved antibacterial (C. jejuni ATCC 33560 and L. monocytogenes 19115) properties compared to native chitosan films. The CS-ZnO films had excellent antibacterial activity towards L. monocytogenes (90% growth inhibition). Moreover, graphene-based chitosan films caused high inhibition of both tested strains. Chitosan films with graphene (GO, GOP, GOP-HMDS, rGO, GO-HMDS, rGOP), titanium dioxide (CS-TiO2 20:1a, CS-TiO2 20:1b, CS-TiO2 2:1, CS-TiO2 1:1a, CS-TiO2 1:1b) and zinc oxide (CS-ZnO 20:1a, CS-ZnO 20:1b) may be considered as a safe, non-cytotoxic packaging materials in the future.

Preparation of biaxially oriented polyamide 6/polyketone/graphene oxide films with enhanced barrier and mechanical behaviors

2021 ◽  
Vol 138 (21) ◽  
pp. 50501
Author(s):  
Fenglong Lin ◽  
Yuejun Liu ◽  
Lijun Song ◽  
Xihai Hao ◽  
Xiaochao Liu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Oxide Films ◽  
Polyamide 6 ◽  
Mechanical Behaviors

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

Crystals ◽  
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.

Photoinduced Terahertz Conductivity and Carrier Relaxation in Thermal-Reduced Multilayer Graphene Oxide Films

2017 ◽  
Vol 121 (4) ◽  
pp. 2451-2458 ◽  
Author(s):  
Xiao Xing ◽  
Litao Zhao ◽  
Zeyu Zhang ◽  
Liang Fang ◽  
Zhengfu Fan ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Oxide Films ◽  
Multilayer Graphene ◽  
Carrier Relaxation ◽  
Terahertz Conductivity

Formation of uniform reduced graphene oxide films on modified PET substrates using drop-casting method

Particuology ◽  
2014 ◽  
Vol 17 ◽  
pp. 66-73 ◽  
Author(s):  
Chunlin Zhao ◽  
Li Xing ◽  
Junhui Xiang ◽  
Lijie Cui ◽  
Jianbin Jiao ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Oxide Films ◽  
Casting Method ◽  
Reduced Graphene

scholarly journals Enhanced antibacterial activity through the controlled alignment of graphene oxide nanosheets

2017 ◽  
Vol 114 (46) ◽  
pp. E9793-E9801 ◽  
Author(s):  
Xinglin Lu ◽  
Xunda Feng ◽  
Jay R. Werber ◽  
Chiheng Chu ◽  
Ines Zucker ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Antibacterial Activity ◽  
Graphene Oxide ◽  
Direct Electron Transfer ◽  
Composite Films ◽  
Experimental Studies ◽  
Cross Linking ◽  
Vertical Orientation ◽  
Electron Transfer Mechanism ◽  
Vertically Aligned

The cytotoxicity of 2D graphene-based nanomaterials (GBNs) is highly important for engineered applications and environmental health. However, the isotropic orientation of GBNs, most notably graphene oxide (GO), in previous experimental studies obscured the interpretation of cytotoxic contributions of nanosheet edges. Here, we investigate the orientation-dependent interaction of GBNs with bacteria using GO composite films. To produce the films, GO nanosheets are aligned in a magnetic field, immobilized by cross-linking of the surrounding matrix, and exposed on the surface through oxidative etching. Characterization by small-angle X-ray scattering and atomic force microscopy confirms that GO nanosheets align progressively well with increasing magnetic field strength and that the alignment is effectively preserved by cross-linking. When contacted with the model bacteriumEscherichia coli, GO nanosheets with vertical orientation exhibit enhanced antibacterial activity compared with random and horizontal orientations. Further characterization is performed to explain the enhanced antibacterial activity of the film with vertically aligned GO. Using phospholipid vesicles as a model system, we observe that GO nanosheets induce physical disruption of the lipid bilayer. Additionally, we find substantial GO-induced oxidation of glutathione, a model intracellular antioxidant, paired with limited generation of reactive oxygen species, suggesting that oxidation occurs through a direct electron-transfer mechanism. These physical and chemical mechanisms both require nanosheet penetration of the cell membrane, suggesting that the enhanced antibacterial activity of the film with vertically aligned GO stems from an increased density of edges with a preferential orientation for membrane disruption. The importance of nanosheet penetration for cytotoxicity has direct implications for the design of engineering surfaces using GBNs.

Reduced Graphene Oxide Films with Ultrahigh Conductivity as Li-Ion Battery Current Collectors

Nano Letters ◽  
2016 ◽  
Vol 16 (6) ◽  
pp. 3616-3623 ◽  
Author(s):  
Yanan Chen ◽  
Kun Fu ◽  
Shuze Zhu ◽  
Wei Luo ◽  
Yanbin Wang ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Oxide Films ◽  
Li Ion Battery ◽  
Current Collectors ◽  
Reduced Graphene ◽  
Li Ion
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