Enhancing the Hydrophobicity of a Copper Pipe by Electrophoretic Deposition of Graphene Oxide

2019 ◽  
Vol 801 ◽  
pp. 153-159
Author(s):  
Essam Hares ◽  
Ahmed H. El-Shazly ◽  
M.F. El-Kady ◽  
A.S. Hammad
Keyword(s):  
Thin Film ◽  
Contact Angle ◽  
Graphene Oxide ◽  
Electrophoretic Deposition ◽  
Graphite Oxide ◽  
Colloidal Suspension ◽  
Aqueous Suspension ◽  
Chemical Oxidation ◽  
Operating Voltage ◽  
Copper Pipe

Thin film coatings of graphene oxide (GO) onto copper pipe was investigating using electrophoretic deposition (EPD) technique. Graphite oxide was produced from graphite powder by chemical oxidation using modified Hummers' method. An aqueous colloidal suspension of graphene oxide was prepared by exfoliation of the graphite oxide via ultrasonic treatment. GO coatings were deposited on copper pipes through EPD from GO aqueous suspension. The EPD parameters such as voltage, time and particle concentration were optimized to obtain uniform GO coatings. The optimal EPD conditions for well-formed deposits were observed when the operating voltage was equal to 30 V and 90 s deposition time. The thin film coated copper pipe was characterized using various techniques such as SEM, XRD and contact angle. XRD confirmed that GO was reduced during the EPD process itself due to the removal of oxygen containing functional groups. SEM images elucidated the formation of GO thin layer onto copper pipe with thickness 5 μm. The contact angle improved from 70° for bare copper to 102.4° for GO coating.

Anodic Aqueous Electrophoretic Deposition of Graphene Oxide on Copper Using Different Cathode Materials

2020 ◽  
Vol 1008 ◽  
pp. 21-27
Author(s):  
Essam Hares ◽  
Ahmed Hassan El-Shazly ◽  
Marwa Farouk El-Kady ◽  
Kholoud Madih ◽  
Hamdiya Orleans-Boham ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Electrophoretic Deposition ◽  
Graphite Oxide ◽  
Cathode Materials ◽  
Aqueous Suspension ◽  
Graphite Powder ◽  
Liquid Exfoliation ◽  
Hummers Method ◽  
Oxide Deposition ◽  
Modified Hummers Method

The effect of four different cathode materials on the anodic deposition of graphene oxide (GO) nanosheets was studied experimentally. First, synthesis of graphite oxide from graphite powder was done by modified Hummers' method. Ultrasonic technique was adopted for the preparation of the stable aqueous suspension of GO by using liquid exfoliation of graphite oxide. Deposition of GO coating on copper sheets (the anode) was done via electrophoretic deposition (EPD) at the same operating condition (5V, 2 min, concentration of 0.5 mg/ml of GO per deionized water) with different cathode materials (copper, stainless steel, aluminum and graphite). The coatings’ morphological and microstructure were investigated using scanning electron microscope (SEM) and the effect of the current density in the EPD process was obtained. The change in the deposition weight was also measured. It was ascertained that the cathode’s material is a major factor can affect the GO’s EPD process and the characteristics of the final coating.

Fabrication of layer-by-layer graphene oxide thin film on copper substrate by electrophoretic deposition

2020 ◽  
Vol 59 (12) ◽  
pp. 125001
Author(s):  
Nan Ye ◽  
Satoka Ohnishi ◽  
Mitsuhiro Okada ◽  
Kazuto Hatakeyama ◽  
Kazuhiko Seki ◽  
...  
Keyword(s):  
Thin Film ◽  
Graphene Oxide ◽  
Electrophoretic Deposition ◽  
Copper Substrate ◽  
Oxide Thin Film ◽  
Layer By Layer ◽  
Layer Graphene

Electrophoretic deposition and thermal annealing of a graphene oxide thin film on carbon fiber surfaces

Carbon ◽  
2013 ◽  
Vol 52 ◽  
pp. 613-616 ◽  
Author(s):  
Sheng-Yun Huang ◽  
Gang-Ping Wu ◽  
Cheng-Meng Chen ◽  
Yu Yang ◽  
Shou-Chun Zhang ◽  
...  
Keyword(s):  
Thin Film ◽  
Graphene Oxide ◽  
Carbon Fiber ◽  
Thermal Annealing ◽  
Electrophoretic Deposition ◽  
Oxide Thin Film

Top-Down Fabrication of Superhydrophilic Graphene Oxide Nanosheets

2016 ◽  
Vol 849 ◽  
pp. 738-742
Author(s):  
Xue Bing Hu ◽  
Yun Yu ◽  
Wen Xiou Ding ◽  
Zhou Hao Xiao ◽  
Yong Qing Wang ◽  
...  
Keyword(s):  
Contact Angle ◽  
Graphene Oxide ◽  
Chemical Oxidation ◽  
Monolayer Graphene ◽  
Graphene Oxide Nanosheets ◽  
Top Down ◽  
Laminar Structure ◽  
Water Contact ◽  
Hummers Method ◽  
Modified Hummers Method

As an oxidized form of graphene, graphene oxide has a variety of oxygen-containing groups together with a laminar structure, showing great potential in various engineering applications. In this work, on the basis of the top-down fabrication principle, superhydrophilic graphene oxide nanosheets with a uniform sheet size of ~50 nm diameter and 0.7 nm thickness were prepared by the modified Hummers method, and using microcrystalline graphite as the carbon source. After chemical oxidation, the obtained graphene oxide nanosheets had a great amount of C-O-C, C-OH and C=O groups and its water contact angle was ~3.9°. This result offers a facile strategy to fabricate superhydrophilic and monolayer graphene oxide nanosheets with well-defined morphology.

scholarly journals Preparation and Characterization of Reduced Graphene Oxide Sheets via Water-Based Exfoliation and Reduction Methods

2013 ◽  
Vol 2013 ◽  
pp. 1-5 ◽  
Author(s):  
Vorrada Loryuenyong ◽  
Krit Totepvimarn ◽  
Passakorn Eimburanapravat ◽  
Wanchai Boonchompoo ◽  
Achanai Buasri
Keyword(s):  
Graphene Oxide ◽  
Reduced Graphene Oxide ◽  
Graphite Oxide ◽  
Low Cost ◽  
Graphite Powder ◽  
Chemical Oxidation ◽  
Distilled Water ◽  
Manufacturing Method ◽  
Ultrasound Frequency ◽  
Reduced Graphene

This research studied the synthesis of graphene oxide and graphene via a low-cost manufacturing method. The process started with the chemical oxidation of commercial graphite powder into graphite oxide by modified Hummer’s method, followed by the exfoliation of graphite oxide in distilled water using the ultrasound frequency from a laboratory ultrasonic bath. Finally, the oxygen functional groups on exfoliated graphite oxide or graphene oxide were eliminated by stirring in hot distilled water at 95°C, as a replacement for highly toxic and dangerously unstable hydrazine. The results assured that stirring in hot distilled water could give the product of graphene or reduced graphene oxide. The samples were characterized by FTIR, XRD, TGA, Raman spectroscopy, SEM, and TEM methods.

Thin Film Fabrication and Simultaneous Anodic Reduction of Deposited Graphene Oxide Platelets by Electrophoretic Deposition

2010 ◽  
Vol 1 (8) ◽  
pp. 1259-1263 ◽  
Author(s):  
Sung Jin An ◽  
Yanwu Zhu ◽  
Sun Hwa Lee ◽  
Meryl D. Stoller ◽  
Tryggvi Emilsson ◽  
...  
Keyword(s):  
Thin Film ◽  
Graphene Oxide ◽  
Electrophoretic Deposition ◽  
Thin Film Fabrication ◽  
Film Fabrication

How Graphene Layers Depend on Drying Methods of Graphene Oxide

2012 ◽  
Vol 554-556 ◽  
pp. 597-600 ◽  
Author(s):  
Ya Nan Lv ◽  
Jian Fang Wang ◽  
Yin Long ◽  
Cheng An Tao ◽  
Lin Xia ◽  
...  
Keyword(s):  
Thin Film ◽  
Graphene Oxide ◽  
Graphite Oxide ◽  
Freeze Drying ◽  
Oxide Powder ◽  
Vacuum Drying ◽  
Drying Methods ◽  
Graphene Layers ◽  
Mixed Acid

Abstract: Graphite oxide is of great importance in preparing graphene, the average layer of graphene depends on that of graphene oxide in some extent. In this paper, we prepared graphite oxide via H3PO4/H2SO4mixed acid, then which were dried by vacuum drying in a freezer dryer and drying oven respectively, the graphite oxide powder and thin film were obtained correspondingly. After dispersing the above two forms of graphite oxide in water by shaking, stirring or supersonic wave, they were reduced in the same condition. According to the XRD, AFM results, vacuum freeze-drying was inclined to gain few-lay graphene.

Electrophoretic Co-Deposition of Chitosan and Graphene Oxide Results in Antibacterial Coatings for Medical Applications

2015 ◽  
Vol 654 ◽  
pp. 176-182 ◽  
Author(s):  
Anke Lisa Metze ◽  
Fatemehsadat Pishbin ◽  
Mary P. Ryan ◽  
Sigrid Seuss ◽  
Mani Diba ◽  
...  
Keyword(s):  
Contact Angle ◽  
Stainless Steel ◽  
Graphene Oxide ◽  
Polymer Matrix ◽  
Electrophoretic Deposition ◽  
Composite Coatings ◽  
Medical Applications ◽  
Antibacterial Studies ◽  
Graphene Oxide Sheets ◽  
Roughness Measurements

Chitosan – graphene oxide (GO) composite coatings intended for antibacterial applications were obtained by cathodic electrophoretic deposition (EPD) on stainless steel. The coatings were characterized using SEM, FTIR, contact angle and roughness measurements and by antibacterial studies againstE.coli. The coating was observed to consist of a polymer matrix with embedded, agglomerated graphene oxide sheets. A decrease in bacteria cell viability of at least 50 % was measured on the chitosan – GO surface in comparison to uncoated stainless steel.

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