scholarly journals Enhanced Mechanical and Antibacterial Properties of Nanocomposites Based on Poly(vinyl Alcohol) and Biopolymer-Derived Reduced Graphene Oxide

Polymers ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 615
Author(s):  
Beom-Gon Cho ◽  
Shalik Ram Joshi ◽  
Seongjin Lee ◽  
Shin-Kwan Kim ◽  
Young-Bin Park ◽  
...  

Functionalized graphene–polymer nanocomposites have gained significant attention for their enhanced mechanical, thermal, and antibacterial properties, but the requirement of multi-step processes or hazardous reducing agents to functionalize graphene limits their current applications. Here, we present a single-step synthesis of thermally reduced graphene oxide (TrGO) based on shellac, which is a low-cost biopolymer that can be employed to produce poly(vinyl alcohol) (PVA)/TrGO nanocomposites (PVA–TrGO). The concentration of TrGO varied from 0.1 to 2.0 wt.%, and the critical concentration of homogeneous TrGO dispersion was observed to be 1.5 wt.%, below which strong interfacial molecular interactions between the TrGO and the PVA matrix resulted in improved thermal and mechanical properties. At 1.5 wt.% filler loading, the tensile strength and modulus of the PVA–TrGO nanocomposite were increased by 98.7% and 97.4%, respectively, while the storage modulus was increased by 69%. Furthermore, the nanocomposite was 96% more effective in preventing bacterial colonization relative to the neat PVA matrix. The present findings indicate that TrGO can be considered a promising material for potential applications in biomedical devices.

2016 ◽  
Vol 705 ◽  
pp. 138-144 ◽  
Author(s):  
Engy Ghoniem ◽  
Ahmed A. El-Moneim

We Demonstrated and Verified the Use Of laser Reduced Graphene Oxide (LRGO) Supported on Polyethylene Terephthalate (PET) Substrate for Flexible Supercapacitor Applications. we Compared the Interdigitated in-Plan Structure with the Conventionally Stacked Structure Supercapacitor. To understand the Role of Increasing the Number of Sub-Electrodes per Unit Area, Three electrode Architecture of 2, 4, and 6 Sub-Electrodes were Studied. Polymeric Gel electrolyte of Poly (vinyl Alcohol) and Phosphoric Acid (PVA-H3PO4)was Selected for the Realization of the Cells. the Interdigital in – Planesupercapacitor with 6 Sub-Electrodes I-PS(6) Showed a Volumetric Capacitance Of9.3 Fcm-3 Opposed to 3.6, 0.6, 0.5 Fcm-3 for I-PS(4), I-PS(2), and conventional Structure Supercapacitor, Respectively at 0.1 Ma Cm-2 Current Density. the Maximum Stated Energy Density of 0.409 Mwh.cm-3and Power Density of 994.6 W.cm-3 were for I-PS(6). our Results clearly Showed that the LRGO can Hold much Promise for Low-Cost, Easy, and Scalablesupercapacitor Fabrication.


2018 ◽  
Vol 20 (2) ◽  
pp. 506-514 ◽  
Author(s):  
Souvik De ◽  
Jodie L. Lutkenhaus

Eco-friendly, sprayable reduced graphene oxide sheet/poly(vinyl alcohol) coatings prevent aluminum alloy corrosion by physical barrier and alternative electron pathway mechanisms.


2019 ◽  
Vol 7 (4) ◽  
pp. 538-547 ◽  
Author(s):  
Yanan Wang ◽  
Yuhui Lu ◽  
Jieyu Zhang ◽  
Xuefeng Hu ◽  
Zeyu Yang ◽  
...  

A graphene and rare earth ion-containing hydrogel was developed to effectively promote the healing of infected chronic wounds without using antibiotics.


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