Study on the Effect of Deposited Graphene Oxide on the Fatigue Life of Austenitic Steel 1.4541 in Different Temperature Ranges

This paper presents the effect of deposited graphene oxide coating on fatigue life of austenitic steel 1.4541 at 20 °C, 100 °C, and 200 °C. The study showed a decrease in the fatigue life of samples with a deposited graphene oxide layer in comparison with reference samples at 20 °C and 100 °C. However, an increase in fatigue life of samples with a deposited graphene oxide layer in comparison with reference samples occurred at 200 °C. This relationship was observed for the nominal stress amplitude of 370 and 420 MPa. Measurements of temperature during the tensile failure of the sample and microfractographic analysis of fatigue fractures were performed. Tests have shown that graphene oxide deposited on the steel surface provides an insulating layer. A higher temperature of the samples with a deposited graphene oxide layer was observed during fracture compared to the reference samples.

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Pyrolysis and Oxidation of PAN in Dry Air. Thermoanalytical Methods

Materials Science ◽

10.5755/j01.ms.17.1.246 ◽

1970 ◽

Vol 17 (1) ◽

pp. 38-42

Author(s):

Anna BIEDUNKIEWICZ ◽

Pawel FIGIEL ◽

Marta SABARA

Keyword(s):

Temperature Increase ◽

Heating Rates ◽

Linear Change ◽

Dry Air ◽

Isothermal Conditions ◽

Gaseous Products ◽

Heterogeneous Processes ◽

Temperature Ranges ◽

Higher Temperature ◽

Kinetics Of

The results of investigations on pyrolysis and oxidation of pure polyacrylonitrile (PAN) and its mixture with N,N-dimethylformamide (DMF) under non-isothermal conditions at linear change of samples temperature in time are presented. In each case process proceeded in different way. During pyrolysis of pure PAN the material containing mainly the product after PAN cyclization was obtained, while pyrolysis of PAN+DMF mixture gave the product after cyclization and stabilization. Under conditions of measurements, in both temperature ranges, series of gaseous products were formed.For the PAN-DMF system measurements at different samples heating rates were performed. The obtained results were in accordance with the kinetics of heterogeneous processes theory. The process rates in stages increased along with the temperature increase, and TG, DTG and HF function curves were shifted into higher temperature range. This means that the process of pyrolysis and oxidation of PAN in dry air can be carried out in a controlled way.http://dx.doi.org/10.5755/j01.ms.17.1.246

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Interphase strengthening of carbon fiber/polyamide 6 composites through mixture of sizing agent and reduced graphene oxide coating

Composites Part A Applied Science and Manufacturing ◽

10.1016/j.compositesa.2021.106521 ◽

2021 ◽

pp. 106521

Author(s):

Beom-Gon Cho ◽

Shalik Ram Joshi ◽

Jong Hun Han ◽

Gun-Ho Kim ◽

Young-Bin Park

Keyword(s):

Graphene Oxide ◽

Carbon Fiber ◽

Reduced Graphene Oxide ◽

Oxide Coating ◽

Polyamide 6 ◽

Reduced Graphene

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Impact of Graphene Oxide on Zero Shear Viscosity, Fatigue Life and Low-Temperature Properties of Asphalt Binder

Materials ◽

10.3390/ma14113073 ◽

2021 ◽

Vol 14 (11) ◽

pp. 3073

Author(s):

Abbas Mukhtar Adnan ◽

Chaofeng Lü ◽

Xue Luo ◽

Jinchang Wang

Keyword(s):

Graphene Oxide ◽

Fatigue Life ◽

Low Temperature ◽

Shear Viscosity ◽

Storage Stability ◽

Asphalt Binder ◽

Asphalt Binders ◽

Test Results ◽

Zero Shear Viscosity ◽

Modified Asphalt

This study has investigated the impact of graphene oxide (GO) in enhancing the performance properties of an asphalt binder. The control asphalt binder (60/70 PEN) was blended with GO in contents of 0%, 0.5%, 1%, 1.5%, 2%, and 2.5%. The permanent deformation behavior of the modified asphalt binders was evaluated based on the zero shear viscosity (ZSV) parameter through a steady shear test approach. Superpave fatigue test and the linear amplitude sweep (LAS) method were used to evaluate the fatigue behavior of the binders. A bending beam rheometer (BBR) test was conducted to evaluate the low-temperature cracking behavior. Furthermore, the storage stability of the binders was investigated using a separation test. The results of the ZSV test showed that GO considerably enhanced the steady shear viscosity and ZSV value, showing a significant contribution of the GO to the deformation resistance; moreover, GO modification changed the asphalt binder’s behavior from Newtonian to shear-thinning flow. A notable improvement in fatigue life was observed with the addition of GO to the binder based on the LAS test results and Superpave fatigue parameter. The BBR test results revealed that compared to the control asphalt, the GO-modified binders showed lower creep stiffness (S) and higher creep rate (m-value), indicating increased cracking resistance at low temperatures. Finally, the GO-modified asphalt binders exhibited good storage stability under high temperatures.

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Bioactivity Performance of Pure Mg after Plasma Electrolytic Oxidation in Silicate-Based Solutions

Molecules ◽

10.3390/molecules26072094 ◽

2021 ◽

Vol 26 (7) ◽

pp. 2094

Author(s):

Yevheniia Husak ◽

Joanna Michalska ◽

Oleksandr Oleshko ◽

Viktoriia Korniienko ◽

Karlis Grundsteins ◽

...

Keyword(s):

Cell Culture ◽

Oxide Layer ◽

Plasma Electrolytic Oxidation ◽

Oxide Coating ◽

Mg Alloy ◽

Aureus Strain ◽

Active Surface Area ◽

Corrosion Properties ◽

Electrolytic Oxidation ◽

Plasma Electrolytic

The biodegradable metals, including magnesium (Mg), are a convenient alternative to permanent metals but fast uncontrolled corrosion limited wide clinical application. Formation of a barrier coating on Mg alloys could be a successful strategy for the production of a stable external layer that prevents fast corrosion. Our research was aimed to develop an Mg stable oxide coating using plasma electrolytic oxidation (PEO) in silicate-based solutions. 99.9% pure Mg alloy was anodized in electrolytes contained mixtures of sodium silicate and sodium fluoride, calcium hydroxide and sodium hydroxide. Scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), contact angle (CA), Photoluminescence analysis and immersion tests were performed to assess structural and long-term corrosion properties of the new coating. Biocompatibility and antibacterial potential of the new coating were evaluated using U2OS cell culture and the gram-positive Staphylococcus aureus (S. aureus, strain B 918). PEO provided the formation of a porous oxide layer with relatively high roughness. It was shown that Ca(OH)2 was a crucial compound for oxidation and surface modification of Mg implants, treated with the PEO method. The addition of Ca2+ ions resulted in more intense oxidation of the Mg surface and growth of the oxide layer with a higher active surface area. Cell culture experiments demonstrated appropriate cell adhesion to all investigated coatings with a significantly better proliferation rate for the samples treated in Ca(OH)2-containing electrolyte. In contrast, NaOH-based electrolyte provided more relevant antibacterial effects but did not support cell proliferation. In conclusion, it should be noted that PEO of Mg alloy in silicate baths containing Ca(OH)2 provided the formation of stable biocompatible oxide coatings that could be used in the development of commercial degradable implants.

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A study on corrosion behavior of graphene oxide coating produced on stainless steel by electrophoretic deposition

Surface and Coatings Technology ◽

10.1016/j.surfcoat.2019.05.050 ◽

2019 ◽

Vol 372 ◽

pp. 327-342 ◽

Cited By ~ 6

Author(s):

M. Mahmoudi ◽

K. Raeissi ◽

F. Karimzadeh ◽

M.A. Golozar

Keyword(s):

Stainless Steel ◽

Graphene Oxide ◽

Corrosion Behavior ◽

Electrophoretic Deposition ◽

Oxide Coating

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Flexible Graphene Sensors for Explosive Trace Detection

Volume 11: Nano and Micro Materials, Devices and Systems; Microsystems Integration ◽

10.1115/imece2011-64135 ◽

2011 ◽

Author(s):

Je Kyun Lee ◽

Steven Green ◽

Sangyup Song ◽

Paul Phamduy ◽

Byungki Kim

Keyword(s):

Graphene Oxide ◽

Polyethylene Terephthalate ◽

Oxide Coating ◽

Trace Detection ◽

Closed Container ◽

Explosive Sensors

This paper presents an explosives sensor. The sensor consists of graphene spray coated onto a substrate with electrodes patterned on the surface. The substrates included glass and flexible polyethylene terephthalate (PET), and the leads were gold and silver respectively. Testing utilizing dinitrotoulene 2,4 (DNT) in a closed container showed the validity of using glass/gold based substrate with a graphene oxide coating as explosive sensors.

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