scholarly journals NANOCOATING OF POLYESTER FABRIC WITH GRAPHENE OXIDE

2019 ◽  
Vol 2019 ◽  
pp. 78-81
Author(s):  
Beyza DOĞAN ◽  
Şule Sultan UĞUR ◽  
Banu TÜRKASLAN
Keyword(s):  
Graphene Oxide ◽  
Multilayer Coating ◽  
Reduction Process ◽  
Polyester Fabric ◽  
Layer By Layer ◽  
Measuring Device ◽  
Hummers Method ◽  
Coating Method ◽  
Fabric Surface ◽  
Layer Coating

GO is easily dispersed in solvents, dielectric property, transparency, electronic features can be adjusted due to the superior mechanical properties and areas of use are expanding day by day. In this study, graphene oxide was obtained from graphite by using modified Hummers method and then applied to polyester fabric surface according to multilayer coating method. Contrary to the traditional Hummers method in the literature, this study was carried out without the use of NaNO₃ in order to be environmentally friendly. Based on the Layer-by-Layer coating method, GO based nano films have been applied to the polyester fabric surface. After obtaining the GO based nanocomposite polyester fabrics, it was treated with Na₂S₂O₄ and NaBH₄ in order to obtain RGO structure and GO reduction was achieved. A thin coating layer was observed in SEM analysis of the reduced graphene oxide (RGO) and GO coated fabrics. In the EDS analysis, increase in the amount of C and the decrease in the amount of O were determined after the reduction process. The most striking feature of graphene oxide was applied to all fabrics with a 4-probe measuring device and the best result was observed in the polyester fabric which was coated with Na₂S₂O₄ in 10 layer 5 minutes with Layer-by-Layer coating method with 1.47 × 1̄0 ³ S/cm².

Optical Characteristics of Multilayer Reduced Graphene Oxides Films Fabricated Using UV Oven Spraying Technique with Various Interval Irradiation Time

2021 ◽  
Vol 1028 ◽  
pp. 279-284
Author(s):  
Nur Khanifah ◽  
Diyan Unmu Dzujah ◽  
Vika Marcelina ◽  
Rahmat Hidayat ◽  
Fitrilawati ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Irradiation Time ◽  
Active Material ◽  
Reduction Process ◽  
Optical Characteristics ◽  
Graphene Oxides ◽  
Super Capacitor ◽  
Reduced Graphene ◽  
Vis Spectroscopy ◽  
Coating Method

Reduced graphene oxide (RGO) is promising candidate to be used as an active material of super capacitor electrodes. Graphene oxide (GO) is mostly used as a precursor, therefore it is needed to remove its oxygen containing functional groups. Generally, the RGO films are obtained from Graphene Oxide (GO) films which are then treated using thermal reduction or photo reduction process. We developed a spraying coating method that called as UV oven spraying by combining spraying coating method and photo reduction process. By this deposition method, we can obtain RGO films directly from the GO precursor since deposition and photo reduction steps are taken place at the same time. Level of oxygen removal of the obtained RGO film depends on irradiation intensity and length of irradiation. In this work, we report the effect of varied length of irradiation time on the RGO optical characteristics. We prepared multilayer of RGO films using UV oven spraying technique on quartz substrates from 0.5 mg/ml commercial GO dispersion (Graphenea) with varied the UV irradiation time. We used 125-Watt mercury lamp that was set at distance of 30 cm from substrates. We examined the effect of varied of length of irradiation time on its optical characteristics using UV-Vis Spectroscopy. Level of reduction by provided irradiation time was examined using SEM/EDS measurement.

scholarly journals Microencapsulated Multi-functionalized Graphene Oxide Equipped With Chloroquine for Efficient and Sustained Sirna Delivery

2021 ◽  
Author(s):  
Rana Imani ◽  
Satya Prakash ◽  
Hojatollah Vali ◽  
John F. Presley ◽  
Shahab Faghihi
Keyword(s):  
Graphene Oxide ◽  
Cellular Uptake ◽  
Sirna Delivery ◽  
Layer By Layer ◽  
Functionalized Graphene ◽  
Functionalized Graphene Oxide ◽  
Lysosomal Ph ◽  
Intracellular Targeting ◽  
Lysosomotropic Agent ◽  
Layer Coating

Abstract A multi-functionalized graphene oxide (GO)-based carrier with conjugation of aminated-polyethylenglycole (PEG-diamine), octaarginine (R8) and folic acid (FA), which also contains chloroquine (CQ), a lysosomotropic agent, is introduced. The cellular uptake mechanisms and intracellular targeting of FA functionalized nanocarriers are examined. The localized releases of CQ and siRNA intracellular delivery are evaluated. Microencapsulation of the nanocarrier complexed with genes in layer-by-layer coating of alginate micro-beads is also investigated. The covalently co-conjugated FA with PEG and R8 provides a stable formulation with increased cellular uptake compared to FA-free carrier. The CQ-equipped nanocarrier shows a 95% release of CQ at lysosomal pH. The localized release of the drug inside the lysosomes is verified which accelerates the cargo discharge into cytoplasm.

scholarly journals Application of Nano particles by Layer-by-Layer (LBL) Deposition Technique to Improve the Functionality of Textiles

2020 ◽  
Vol 06 (9S) ◽  
pp. 183-191
Author(s):  
Dr. Chet Ram Meena
Keyword(s):  
Textile Industry ◽  
High Surface ◽  
High Surface Area ◽  
Ultra Violet ◽  
Nano Particles ◽  
Layer By Layer ◽  
Molecular Weights ◽  
Coating Method ◽  
Textile Polymers ◽  
Fabric Surface

Few decades back, a Nano word with big promising has been precipitously implying itself into the world's realization and associates with everyday life, economics and globally consequences. Functionalization of textile polymers has been practiced by different techniques to confer new properties on to the fibre so as to enable their application in fields other than textile industry. Nanotechnology may deliver the better performances and functionality to the textile materials due to the high surface area and energy. Further, Nanoparticles can apply on the fabrics by coating method without affecting the comfort and feel of the fabrics. It has improved the various properties like ultra violet protection, antibacterial and stain proof etc. LBL techniques is used to produce a thin polymeric film in a controlled manner on a surface of fabrics by using of different size of molecular weights and charges of polyelectrolytes. The unique feature of this technique is that it forms a very thin layer on fabric surface (1-10 nm) as compared to other available techniques; thus, no deterioration of surface properties of the substrate on which they are deposited. Nano TiO2 and ZnO particles along with polyelectrolytes and produce PEM on the Nylon 66 substrate by using LBL technique to get the antimicrobial and Ultraviolet protection property.

Calcium-doped ceria/titanate tabular functional nanocomposite by layer-by-layer coating method

2010 ◽  
Vol 183 (7) ◽  
pp. 1545-1549 ◽  
Author(s):  
Xiang W. Liu ◽  
M.K. Devaraju ◽  
Shu Yin ◽  
Tsugio Sato
Keyword(s):  
Layer By Layer ◽  
Doped Ceria ◽  
Coating Method ◽  
Calcium Doped ◽  
Layer Coating

scholarly journals Enhanced third-order optical Kerr nonlinearity in SiN nanowires with integrated 2D graphene oxide films

2021 ◽  
Author(s):  
David Moss
Keyword(s):  
Graphene Oxide ◽  
Kerr Nonlinearity ◽  
Layer By Layer ◽  
Third Order ◽  
Strong Light ◽  
Precise Control ◽  
Highly Nonlinear ◽  
Pattern Length ◽  
Coating Method ◽  
Lift Off

Abstract Layered 2D graphene oxide (GO) films are integrated with silicon nitride (SiN) waveguides to experimentally demonstrate an enhanced Kerr nonlinearity via four-wave mixing (FWM). Owing to the strong light–matter interaction between the SiN waveguides and the highly nonlinear GO films, the FWM performance of the hybrid waveguides is significantly improved. SiN waveguides with both uniformly coated and patterned GO films are fabricated based on a transfer-free, layer-by-layer GO coating method together with standard photolithography and lift-off processes, yielding precise control of the film thickness, placement and coating length. Detailed FWM measurements are carried out for the fabricated devices with different numbers of GO layers and at different pump powers. By optimizing the trade-off between the nonlinearity and loss, we obtain a significant improvement in the FWM conversion efficiency of ≈7.3 dB for a uniformly coated device with 1 layer of GO and ≈9.1 dB for a patterned device with 5 layers of GO. We also obtain a significant increase in FWM bandwidth for the patterned devices. A detailed analysis of the influence of pattern length and position on the FWM performance is performed. Based on the FWM measurements, the dependence of GO’s third-order nonlinearity on layer number and pump power is also extracted, revealing interesting physical insights about the 2D layered GO films. Finally, we obtain an enhancement in the effective nonlinear parameter of the hybrid waveguides by over a factor of 100. These results verify the enhanced nonlinear optical performance of SiN waveguides achievable by incorporating 2D layered GO films.

Green Reduction of Graphene Oxide Coated Polyamide Fabric Using Carob Extract

2020 ◽  
Vol 7 (6) ◽  
pp. 33-40
Author(s):  
Nergis Gültekin ◽  
İsmail Usta ◽  
Bahattin Yalçin
Keyword(s):  
Graphene Oxide ◽  
Chemical Reduction ◽  
Reduction Process ◽  
Dip Coating ◽  
X Ray Diffraction ◽  
Reduced Graphene ◽  
Structure Morphology ◽  
Coating Method ◽  
Polyamide Fabric ◽  
Dip Coating Method

A green reduction processes for graphene oxide using carob extract is reported in this work. In this study, graphene oxide (GO) nanosheets were synthesized using the improved Hummer's method and applied to polyamide fabric thorough the simple dip coating method. Then, the graphene oxide was reduced with a chemical reduction process using carob extract as a green reducing agent to give the reduced graphene oxide (RGO) material. The reduction time was studied. The structure, morphology, and thermal behavior of the material was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), and thermogravimetric analysis (TGA), respectively. The electrical resistivity results clearly revealed that the GO coated polyamide fabric was successfully converted to the RGO coated polyamide fabric with the effective elimination of oxygen containing functional groups.

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