scholarly journals Graphene Oxide Reinforced Polycarbonate Nanocomposite Films with Antibacterial Properties

2016 ◽  
Vol 2016 ◽  
pp. 1-10 ◽  
Author(s):  
R. Mahendran ◽  
D. Sridharan ◽  
K. Santhakumar ◽  
T. A. Selvakumar ◽  
P. Rajasekar ◽  
...  
Keyword(s):  
Thin Films ◽  
Graphene Oxide ◽  
Low Cost ◽  
Thermal Studies ◽  
Composite Films ◽  
Antibacterial Properties ◽  
Antibacterial Activities ◽  
Nanocomposite Films ◽  
Matrix Microstructure ◽  
Phase Inversion Technique

The incorporation of carbonaceous nanofillers into polymers can result in significant materials with improved physicochemical properties and novel composite functionalities. In this study, we have fabricated antibacterial, lightweight, transparent, and flexible graphene oxide (GO) reinforced polycarbonate thin films by a facile and low-cost methodology. Solution blending is employed to get a homogeneous mixture of PC-GO composites at various loading of GO, and the thin films are prepared by dry-wet phase inversion technique. Thermal studies and micrographs of the films revealed the incorporation of GO in PC matrix. Microstructure of the thin films showed the homogeneous dispersion of GO at micro- and nanoscales; however, at higher loading of GO (0.7%), significant agglomeration is observed. More importantly, PC-GO composite films exhibited excellent antibacterial activities against E. coli and S. aureus, owing to the antibacterial nature of GO nanoparticles.

scholarly journals Biodegradable Polymer Films with a Natural Antibacterial Extract as Novel Periodontal Barrier Membranes

2019 ◽  
Vol 2019 ◽  
pp. 1-7 ◽  
Author(s):  
Zehra Betul Ahi ◽  
Nergis Zeynep Renkler ◽  
Mine Gul Seker ◽  
Kadriye Tuzlakoglu
Keyword(s):  
Low Cost ◽  
Composite Films ◽  
Antibacterial Properties ◽  
Composite Membranes ◽  
Antibacterial Activities ◽  
Sem Analysis ◽  
Ease Of Use ◽  
Casting Method ◽  
Barrier Membranes ◽  
Biodegradable Composite

Biodegradable composite membranes containing propolis were produced from PCL/PLLA blends using a simple and low-cost solvent casting method, and subsequently their physicochemical, mechanical, and antibacterial properties were characterized. SEM analysis revealed that the addition of propolis has created honeycomb-like structures on the film surfaces. The flexibility of the films increased in the presence of propolis, which may provide ease of use during application. Propolis disrupted the organized structure of both polymers at the molecular level and caused decreases in the melting points. The films with propolis showed faster degradation in physiological conditions due to this molecular disruption. Moreover, the PLLA/PCL/propolis composite films exhibited remarkable antibacterial activities againstS. aureus. Collectively, the data suggest that the produced films might be used as an alternative to exiting barrier membranes in guided tissue regeneration.

Mechanical and antibacterial properties of ZnO/chitosan bio-composite films

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Ayse Kalemtas ◽  
Hasan B. Kocer ◽  
Ahmet Aydin ◽  
Pinar Terzioglu ◽  
Gulsum Aydin
Keyword(s):  
Particle Size ◽  
Food Packaging ◽  
Mechanical Test ◽  
Composite Films ◽  
Antibacterial Properties ◽  
Chitosan Film ◽  
Antibacterial Activities ◽  
Diffusion Method ◽  
Zno Powders ◽  
Solution Casting Method

Abstract In the current study, ZnO/chitosan bio-composite films were produced via solution-casting method. Two different ZnO powders, micrometer (d50 ≅ 1.5 μm) and nanometer sized (d50 ≅ 100 nm), were used to investigate the effect of ZnO particle size and concentration (0, 2, and 8% w/w of chitosan) on the mechanical and antibacterial properties of the ZnO/chitosan bio-composite films. The incorporation of the ZnO powders into the chitosan film resulted in an increase in the tensile strength (TS) and a decrease in the elongation at break (EB) values. Mechanical test results revealed that TS and EB properties were considerably affected (p < 0.05) by the concentration and particle size of the ZnO reinforcement. Disc diffusion method demonstrated good antibacterial activities of bio-composite films containing high amount of ZnO (8% w/w of chitosan) against Escherichia coli, Staphylococcus aureus, Klebsiella pneumoniae, and Bacillus subtilis. The growth-limiting effect of the films was more pronounced for S. aureus and K. pneumoniae. Due to enhanced TS and imparted antibacterial activity of the produced ZnO/chitosan bio-composite films, these materials are promising candidates for applications such as food packaging, wound dressing, and antibacterial coatings for various surfaces.

Development and antibacterial activities of bacterial cellulose/graphene oxide-CuO nanocomposite films

2020 ◽  
Vol 229 ◽  
pp. 115456 ◽  
Author(s):  
Yan-Yan Xie ◽  
Xiao-Hui Hu ◽  
Yan-Wen Zhang ◽  
Fazli Wahid ◽  
Li-Qiang Chu ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Bacterial Cellulose ◽  
Antibacterial Activities ◽  
Nanocomposite Films

Silica/Silicone Nanocomposite Films: A New Concept in Corrosion Protection

1992 ◽  
Vol 274 ◽  
Author(s):  
Theresa E. Gentle ◽  
Ronald H. Baney
Keyword(s):  
Thin Films ◽  
Optical Microscopy ◽  
Composite Films ◽  
Dip Coating ◽  
Nanocomposite Films ◽  
Nanoporous Silica ◽  
Silica Films ◽  
Aluminum Panels ◽  
Organic Solutions ◽  
Salt Fog

ABSTRACTThin films of silsesquioxane, (HSiO3/2)n, were applied to aluminum panels and to CMOS microelectronic circuit surfaces by spin or dip coating organic solutions of the silsesquioxane. Nanoporous silica was obtained by oxidation of the silsesquioxane. These nanoporous silica films were then vacuum infiltrated with various viscosities of polydimethylsiloxanes (PDMS) to form hydrophobic nanocomposites. The nanocomposite films were shown to provide superior hermetic protection against salt fog exposure when compared to PDMS and silica films alone.The composite films were characterized by FTIR and optical microscopy. FTIR spectra showed that the silica served as a skeletal framework holding the hydrophobic PDMS in place and preventing loss of adhesion. This is in contrast to PDMS films alone in which blistering of the film from the substrate can occur, thus, allowing ions and moisture to reach the surface and corrosion to take place.

scholarly journals Synthesis, Characterization, Photo-Luminescence and Antibacterial Activities of Silica-Graphene Oxide Composites

2021 ◽  
Author(s):  
Imad H. Khaleel ◽  
Abdulkareem A. Alkhafaji ◽  
Hussein A. Miran ◽  
Zainab N. Jaf
Keyword(s):  
Thin Film ◽  
Graphene Oxide ◽  
Sol Gel ◽  
Antibacterial Properties ◽  
Dye Adsorption ◽  
Photo Luminescence ◽  
Antibacterial Activities ◽  
Nano Particles ◽  
Glass Substrates ◽  
Nano Powder

In this research, a novel thin film Si-GO10 and nano-powders Si-GO30 of silica-graphene oxide composite were prepared via sol-gel method and deposited on glass substrates using spray pyrolysis. XRD results showed a relatively strong peak in graphite layer that corresponds to the plane of (002). TEM images displayed that SiO<sub>2</sub> nano-particles were randomly distributed on the surface of Si-GO30 sample, and the particle size in these nano-powders was below 50 nm. Moreover, silica nano-particles on the surface of GO plates exhibited almost a spherical and rod-like nanoparticles shapes, which in turn confirmed the formation of SiO<sub>2</sub>-GO nano-hybrids. FESEM analysis reveals a different morphology, the Si-GO10 sample is so rough and crumble, while the Si-GO30 sample is relatively smooth on the surface. Photocatalytic investigations revealed the composite materials exhibit high activity for dye adsorption and decomposition. Si-GO10 thin film did not undergo degradation after 120 minutes, however, for Si-GO30 nano-powder, the adsorption peak intensity was reduced to 665 nm, indicating a decrease in the dye concentration in the solution. FTIR analysis demonstrated that carboxylic functional groups are decreased by increasing silica particles. Photo-Luminescence (PL) spectrum in Si-GO10 thin film disclosed a severe emission peak at about 675 nm. This spectrum was completely disappeared in Si-GO30 nano-powders. Results of the antibacterial properties emphasized that Si-GO30 nano-particle would prevent Escherichia. coli growth after 20 hours. The presented methodology allows for the synthesis of graphene oxide supported silicon dioxide nano-particles for promising applications in photocatalytic and antibacterial fields.

scholarly journals Analogy and Comparative Study of Hydroxypropyl Methylcellulose (HPMC) Biopolymer with Graphene Oxide and Zinc Oxide Nano Fillers

2021 ◽  
Vol 33 (7) ◽  
pp. 1513-1518
Author(s):  
Sanoop Padinhattayil ◽  
K. Sheshappa Rai
Keyword(s):  
Zinc Oxide ◽  
Graphene Oxide ◽  
Comparative Study ◽  
Hydroxypropyl Methylcellulose ◽  
Composite Films ◽  
Polymer Nanocomposite ◽  
Thermal Characterization ◽  
Xrd Analysis ◽  
Nanocomposite Films ◽  
Mechanical Study

Present study describes the analogy and comparative study of polymer nanocomposites with the known polymer matrix hydroxypropyl methylcellulose (HPMC) incorporated with graphene oxide (GO) and zinc oxide (ZnO) nanoparticles as nano fillers. The polymer nanocomposite films were carried out using solution casting method and characterized by IR spectroscopy, XRD analysis, mechanical properties, thermal characterization and optical microscopy analysis. There were several changes in the HPMC polymer by the addition of nanoparticles of GO and ZnO in structural, thermal, mechanical and optical properties. The thermal stability of the composite films increased as compared with the pure HPMC whereas the mechanical study shows a variation of down values.

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 ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Vinyl Alcohol ◽  
Bacterial Colonization ◽  
Low Cost ◽  
Critical Concentration ◽  
Antibacterial Properties ◽  
Single Step ◽  
Poly Vinyl Alcohol ◽  
Reduced Graphene

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.

Antibacterial activities and mechanisms of fluorinated graphene and guanidine-modified graphene

RSC Advances ◽  
2016 ◽  
Vol 6 (11) ◽  
pp. 8763-8772 ◽  
Author(s):  
Xu Wang ◽  
Peng Lu ◽  
Yuan Li ◽  
Huining Xiao ◽  
Xiangyang Liu
Keyword(s):  
Graphene Oxide ◽  
Antibacterial Properties ◽  
Antibacterial Activities ◽  
Graphene Derivatives ◽  
Fluorinated Graphene ◽  
Modified Graphene

The antibacterial properties and mechanism of three types of graphene derivatives, graphene oxide (GO), fluorinated graphene (FG), and guanidine-modified graphene (PHGH-G), were comparatively studied.

scholarly journals Efficient NIR light blockage with matrix embedded silver nanoprism thin films for energy saving window coating

2016 ◽  
Vol 4 (8) ◽  
pp. 1584-1588 ◽  
Author(s):  
M. Carboni ◽  
M. Carravetta ◽  
X. L. Zhang ◽  
E. Stulz
Keyword(s):  
Thin Films ◽  
Thermal Radiation ◽  
Energy Saving ◽  
Radiation Flux ◽  
Low Cost ◽  
Composite Films ◽  
Silver Nanoprisms ◽  
Highly Efficient ◽  
Pmma Matrix ◽  
Nir Light

Highly efficient composite films, consisting of silica coated and functionalised silver nanoprisms (SNPs) which are covalently embedded in a PMMA matrix, are presented as a low-cost material to reduce thermal radiation flux with low impact on daylight transmission.

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