Combined effect of cellulose nanocrystal and reduced graphene oxide into poly-lactic acid matrix nanocomposite as a scaffold and its anti-bacterial activity

In this study, a nanocomposite of reduced graphene oxide (RGO) nanofiller-reinforcement poly(lactic acid) (PLA)/poly(ethylene glycol) (PEG) matrix was prepared via the melt blending method. The flexibility of PLA was improved by blending the polymer with a PEG plasticizer as a second polymer. To enhance the electromagnetic interference shielding properties of the nanocomposite, different RGO wt % were combined with the PLA/PEG blend. Using Fourier-transform infrared (FT-IR) spectroscopy, field emission scanning electron microscopy (FE-SEM) and X-ray diffraction, the structural, microstructure, and morphological properties of the polymer and the RGO/PLA/PEG nanocomposites were examined. These studies showed that the RGO addition did not considerably affect the crystallinity of the resulting nanomaterials. Thermal analysis (TGA) reveals that the addition of RGO highly improved the thermal stability of PLA/PEG nanocomposites. The dielectric properties and electromagnetic interference shielding effectiveness of the synthesized nanocomposites were calculated and showed a higher SE total value than the target value (20 dB). On the other hand, the results showed an increased power loss by increasing the frequency and conversely decreased with an increased percentage of filler.

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Synergistic poly(lactic acid) photoreforming and H2 generation over ternary NixCo1-xP/reduced graphene oxide/g-C3N4 composite

Chemosphere ◽

10.1016/j.chemosphere.2021.131905 ◽

2021 ◽

pp. 131905

Author(s):

Jun-Qiu Yan ◽

De-Wen Sun ◽

Jian-Hua Huang

Keyword(s):

Graphene Oxide ◽

Lactic Acid ◽

Reduced Graphene Oxide ◽

Poly Lactic Acid ◽

H2 Generation ◽

Reduced Graphene

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Superhydrophobic reduced graphene oxide@poly(lactic acid) foam with electrothermal effect for fast separation of viscous crude oil

Journal of Materials Science ◽

10.1007/s10853-021-06029-3 ◽

2021 ◽

Vol 56 (19) ◽

pp. 11266-11277

Author(s):

Qingtao Zeng ◽

Piming Ma ◽

Dehui Lai ◽

Xuejun Lai ◽

Xingrong Zeng ◽

...

Keyword(s):

Graphene Oxide ◽

Lactic Acid ◽

Crude Oil ◽

Reduced Graphene Oxide ◽

Poly Lactic Acid ◽

Fast Separation ◽

Reduced Graphene

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Bacterial response to graphene oxide and reduced graphene oxide integrated in agar plates

Royal Society Open Science ◽

10.1098/rsos.181083 ◽

2018 ◽

Vol 5 (11) ◽

pp. 181083 ◽

Cited By ~ 6

Author(s):

V. R. S. S. Mokkapati ◽

Santosh Pandit ◽

Jinho Kim ◽

Anders Martensson ◽

Martin Lovmar ◽

...

Keyword(s):

Graphene Oxide ◽

Reduced Graphene Oxide ◽

Bacterial Growth ◽

Bacterial Species ◽

Bacterial Activity ◽

Bacterial Physiology ◽

Bacterial Response ◽

Solid Agar ◽

Reduced Graphene ◽

Set Up

There are contradictory reports in the literature regarding the anti-bacterial activity of graphene, graphene oxide (GO) and reduced graphene oxide (rGO). This controversy is mostly due to variations in key parameters of the reported experiments, like: type of substrate, form of graphene, number of layers, type of solvent and most importantly, type of bacteria. Here, we present experimental data related to bacterial response to GO and rGO integrated in solid agar-based nutrient plates—a standard set-up for bacterial growth that is widely used by microbiologists. Bacillus subtilis and Pseudomonas aeruginosa strains were used for testing bacterial growth. We observed that plate-integrated rGO showed strong anti-bacterial activity against both bacterial species. By contrast, plate-integrated GO was harmless to both bacteria. These results reinforce the notion that the response of bacteria depends critically on the type of graphene material used and can vary dramatically from one bacterial strain to another, depending on bacterial physiology.

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