Anti-Friction Effect of Graphite Nonasheets Formed by Sonicating Expanded Graphite

2012 ◽  
Vol 189 ◽  
pp. 210-213
Author(s):  
Zhi Guo Liu
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Liquid Medium ◽  
Weight Ratio ◽  
Expanded Graphite ◽  
Optimum Conditions ◽  
Base Oil ◽  
Graphite Nanosheets ◽  
Friction Effect ◽  
Scanning Electron

Graphite nanosheets were prepared by sonicating expanded graphite (EG) in a liquid medium. The products were characterized by scanning electron microscope (SEM), and its anti-friction effect used as additive of base oil was investigated. The influencing factors of its anti-friction effect, the weight ratio of graphite nanosheets to base oil, the sonicating medium and sonicating time, were studied and optimized. The results show that under the optimum conditions the graphite nanosheets exhibit an excellent anti-friction effect.

Effect of Expansion Temperature of Expandable Graphite on Anti-Friction Effect of Graphite Nonasheets from Sonicating Expanded Graphite

2011 ◽  
Vol 80-81 ◽  
pp. 225-228
Author(s):  
Wen Yan Duan
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Heating Temperature ◽  
Expanded Graphite ◽  
Expandable Graphite ◽  
Graphite Nanosheets ◽  
Friction Effect ◽  
Expansion Temperature ◽  
Scanning Electron

Three graphite nanosheets were prepared by sonicating three expanded graphites that were formed by rapidly heating expandable graphite at 600, 800 and 1000 °C, respectively. The graphite nanosheets were characterized by scanning electron microscope. The anti-friction effects of the graphite nanosheets used as lubricating additives were investigated. The results show that the size of the graphite nanosheets decreases with increasing the temperature of expandable graphite. The graphite nanosheets have an obvious anti-friction effect, and the effect is related to the heating temperature.

Preparing Graphite Nanosheets by Sonicating Expanded Graphite

2014 ◽  
Vol 552 ◽  
pp. 353-356
Author(s):  
Xue Qing Yue ◽  
Hua Wang ◽  
Wei Ma ◽  
Jun Shuang Tian
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Liquid Medium ◽  
Expanded Graphite ◽  
Average Diameter ◽  
Natural Graphite ◽  
Graphite Nanosheets ◽  
Water Washing ◽  
Scanning Electron

Natural Graphite Flakes were Treated by Intercalating, Water-Washing, Drying and Expanding, Forming Expanded Graphite. Graphite Nanosheets were Prepared by Sonicating Expanded Graphite in a Liquid Medium. the Corresponding Products were Characterized by Scanning Electron Microscope. the Results Show that the Graphite Nanosheets as-Prepared have an Average Diameter of 16μm and an Average of Thickness of 25 Nm.

scholarly journals Blended PVA/PVP Electro spun nanofibers for Coating Application

2021 ◽  
Vol 2114 (1) ◽  
pp. 012031
Author(s):  
R Mohammed ◽  
H Jawad ◽  
A. Al-Zubiedy
Keyword(s):  
Electrical Conductivity ◽  
Contact Angle ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Weight Ratio ◽  
Polymeric Materials ◽  
Vinyl Pyrrolidone ◽  
Pumping Rate ◽  
Coating Application ◽  
Scanning Electron

Abstract The use of polymeric blended nanofibres is one of the recent applications in the food and liquid packaging. The current research aims to prepare the nanofibers coatings from the blend of polymeric materials via the electro spinning technique 0.08 weight ratio concentration of polyvinyl alcohol (PVA) dissolved in water, as well as, (0.2 weight ratio concentration ) of poly vinyl pyrrolidone (PVP) were used to obtain different volume proportions of (PVA:PVP) solutions include (100:0, 80:20,70:30, 50:50, 20:80, and 0:100). The electro spinning system was organized with pumping conditions (20 kV for the applied voltage, 20 cm pumping distance, 1ml/hr pumping rate) and a needle diameter with 0.4mm diameter. The properties of the polymeric solutions involve (viscosity, surface tension, and electrical conductivity of the liquid) were examined. A scanning electron microscope technique was used to study the surface properties of the prepared films, and the contact angle via the contact angle analyzer was examined. The results of a scanning electron microscope proved that the diameter of the nano fibers increases with increasing the concentration and viscosity of solutions and decreasing its electrical conductivity. Also, the results of the contact angle analyzer showed an increase the hydrophilic property via increasing percentage of polyvinylpyrrolidone.

Impregnated Molecular Sieves as a Catalyst for the Isopropylation of Naphthalene

2013 ◽  
Vol 329 ◽  
pp. 45-50 ◽  
Author(s):  
Xin Zhang ◽  
Xi Dong Liu
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Molecular Sieves ◽  
Catalytic Properties ◽  
Fixed Bed ◽  
Optimum Conditions ◽  
Reaction Conditions ◽  
Energy Dispersion Spectrometer ◽  
Micro Reactor ◽  
Scanning Electron

At refluence temperature, ferric chloride impregnated molecular sieves were prepared by impregnation of FeCl3 through ion-exchanging methods. The above catalysts were characterized by the means of SEM/EDS (scanning electron microscope/energy dispersion spectrometer) and BET. The catalytic properties on isopropylation of naphthalene and effect of reaction conditions were carried out with fixed-bed flow micro-reactor. We obtained the optimum conditions of this reaction. At this condition, the conversion of naphthalene reaches 44.1%, the yield of 2, 6-DIPN is 41.2% and the selectivity of β,β-DIPN is 85.2%.

Attenuation and Absorption of Electromagnetic Waves of Nanocomposites (ZnFe2O3 / Graphene: UPE) by Wave Guide Technical

2021 ◽  
Vol 19 (4) ◽  
pp. 71-76
Author(s):  
M.A. Mohammed ◽  
Fadhil K. Farhan ◽  
I.K. Jassim ◽  
A. Sh. Mahmoud
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Electromagnetic Waves ◽  
Weight Ratio ◽  
Microwave Frequencies ◽  
Nano Powder ◽  
Best Value ◽  
X Band ◽  
Ultrasound Technology ◽  
Scanning Electron

In this article, composites with a polymeric basis were prepared and developed with a ZnFe2O3 material dyed with graphene that has the ability to absorb and attenuate by a weight ratio of (1-4) % of the base. The samples were formed by chemical blending and ultrasound technology to homogenize the mixture. The waveguide technique was used at the microwave frequencies in the range of 8- 12 kHz and within the X-band range - the results showed a significant improvement in the absorbance and attenuation by increasing the percentage of the deformed material compared to the blank material, and the best value was obtained at 3%. The compositional examinations of the Nano powder were performed using a scanning electron microscope technology equipped with an EDX scan.

Preparation and Properties of Composite Photocatalyst of Needle ZnO Nanorod Grafted in the Pores of Expanded Graphite

2011 ◽  
Vol 204-210 ◽  
pp. 273-277
Author(s):  
Song Jian Zhao ◽  
En Qiang Wang ◽  
Min Cong Zhu ◽  
Li Na Ding ◽  
Ying Chen Zhang ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Fourier Transformation ◽  
Chemical Structure ◽  
Expanded Graphite ◽  
Zno Nanorod ◽  
Composite Photocatalyst ◽  
Hydrolysis Method ◽  
Ft Ir ◽  
Scanning Electron

A composite photocatalyst of needle ZnO nanorod grafted in the pores of expanded graphite (EG) was prepared by a process of hydrolysis method directly, in which the expanded graphite was prepared by microwave irradiation. Scanning electron microscope (SEM) and Fourier transformation infrared spectroscope (FT-IR) were used to characterize the structure and the chemical structure of the photocatalyst. The results indicate that expanded graphite had a unique net-like pores structure and ZnO Nanorod was loaded on EG to form EG/ZnO composite photocatalyst.

Preparing and Sphericizing Ultrafine Graphite Particles with Stirred Mill

2014 ◽  
Vol 539 ◽  
pp. 785-789
Author(s):  
Ling Yan Zhang ◽  
Yang Shuai Qiu ◽  
Wei Hong ◽  
Cheng Cai Deng
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Weight Ratio ◽  
Raw Material ◽  
Graphite Particles ◽  
Study Results ◽  
Conditional Tests ◽  
Operation Parameters ◽  
Scanning Electron ◽  
Main Operation

The ultrafine graphite particles was prepared and sphericized by stirred mill. By the conditional tests, the influences of the main operation parameters, such as ball-to-powder weight ratio, grinding concentration, dispersant dosage, agitator speed on grinding efficiencies of stirred mill were studied systematically .The reasons of the influence was analyzed. The study results offered suitable operation parameters for practical production. The scanning electron microscope (SEM) was employed to investigate the structure of the ore sample. The result showed the sphericity of product was improved than the raw material.

Needleless Electrospinning of Silk Fibroin/Gelatin Blend Nanofibres

2015 ◽  
Vol 804 ◽  
pp. 213-216
Author(s):  
Nongnut Sasithorn ◽  
Lenka Martinová
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Silk Fibroin ◽  
Weight Ratio ◽  
Electrospun Fibre ◽  
Composition Ratio ◽  
Needleless Electrospinning ◽  
Electrospinning Method ◽  
Scanning Electron

In this study, nanofibres consisting of silk fibroin (SF) and gelatin (GP) with different composition ratio were fabricated by needleless electrospinning method. The influences of SF/GP blending ratio on the properties of spinning solution and the morphology of electrospun fibres were investigated. A variety of compositions of the silk fibroin/gelatin blend solutions were successfully electrospun into nanofibres sheet. The morphology of electrospun fibre was characterized by a scanning electron microscope (SEM) which indicates that the morphology of obtained fibres was influenced by the weight ratio of gelatin to silk fibroin in the spinning solution. It was observed that the blending ratio of gelatin to silk fibroin in spinning solution played an important role in spinning performance of the process and the diameter of obtained fibres. An increasing in gelatin content in blended solution resulted in bigger diameter of the obtained electrospun fibres. The silk fibroin/gelatin electrospun fibres had diameters ranging from 200 to 660 nm.

Producing a New Expanded Graphite by Re-Intercalation of Expandable Graphite

2014 ◽  
Vol 552 ◽  
pp. 349-352
Author(s):  
Xue Qing Yue ◽  
Hua Wang ◽  
Wei Ma
Keyword(s):  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Expanded Graphite ◽  
Expandable Graphite ◽  
The Common ◽  
Scanning Electron

A new expanded graphite was prepared by re-intercalation and expansion of expandable graphite. The products were characterized by scanning electron microscope. Compared with the common expanded graphite, the network pores of this expanded graphite are more developed.

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