scholarly journals Effects of initial graphite particle size and shape on oxidation time in graphene oxide prepared by Hummers' method

2017 ◽  
Vol 2 (4) ◽  
pp. 470-475 ◽  
Author(s):  
Seyyedeh Saadat Shojaeenezhad ◽  
Mansoor Farbod ◽  
Iraj Kazeminezhad
Keyword(s):  
Particle Size ◽  
Graphene Oxide ◽  
Graphite Particle ◽  
Oxidation Time ◽  
Size And Shape ◽  
Hummers Method ◽  
Particle Size And Shape ◽  
Initial Graphite

Effect of graphite particle size on oxidation of graphene oxide prepared by Modified Hummers method

2020 ◽  
Author(s):  
K. Kavyashree ◽  
D. R. Madhuri ◽  
Ashok R. Lamani ◽  
H. S. Jayanna ◽  
M. Hemantha
Keyword(s):  
Particle Size ◽  
Graphene Oxide ◽  
Graphite Particle ◽  
Hummers Method ◽  
Modified Hummers Method

Influence of graphite particle size and shape on the properties of NBR

2006 ◽  
Vol 102 (4) ◽  
pp. 4007-4015 ◽  
Author(s):  
Jian Yang ◽  
Ming Tian ◽  
Qing-Xiu Jia ◽  
Li-Qun Zhang ◽  
Xiao-Lin Li
Keyword(s):  
Particle Size ◽  
Graphite Particle ◽  
Size And Shape ◽  
Particle Size And Shape

Effect of Particle Size of Natural Flake Graphite on the Size and Structure of Graphene Oxide Prepared by the Modified Hummers Method

2015 ◽  
Vol 814 ◽  
pp. 185-190 ◽  
Author(s):  
Hai Yang Xian ◽  
Tong Jiang Peng ◽  
Hong Juan Sun
Keyword(s):  
Particle Size ◽  
Graphene Oxide ◽  
Graphite Particle ◽  
Flake Graphite ◽  
Laser Scattering ◽  
Force Microscopy ◽  
Hummers Method ◽  
Effect Of Particle Size ◽  
Modified Hummers Method ◽  
Size And Structure

The effect of particle size of natural graphite on the size and structure of graphene oxide (GO) was investigated by using natural flake graphite (NFG) with different particle size. GO was prepared by modified Hummers method. X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), Raman spectroscopy, laser scattering particle size distribution analyzer and Atom force microscopy (AFM) were used to identify the characteristics of NFG and GO. The results provide evidence of how the graphite particle size affects the oxidation process and sheet size of the GO. Varies size monolayer GO sheets could be produced from the graphite with different particle size. The sheet size of GO is much smaller than that of the graphite, and the sheet size reduced multiple is proportional to the graphite particle size. The smaller particle size graphite is easily to be oxidized for a higher concentration GO suspension, and for more defect in the structure. Thus, this study leads to a better understanding of the preparation process of GO and provides a way to produce GO in different sheet size suitable for different applications.

Brake Wear Particle Size and Shape Analysis of Non-Asbestos Organic (NAO) and Semi Metallic Brake Pad

2014 ◽  
Vol 71 (2) ◽  
Author(s):  
Hussain, S. ◽  
M.K Abdul Hamid ◽  
A.R Mat Lazim ◽  
A.R. Abu Bakar
Keyword(s):  
Particle Size ◽  
Wear Particle ◽  
Brake Disc ◽  
Wear Particles ◽  
Brake Pad ◽  
Brake Pads ◽  
Size And Shape ◽  
Brake Wear Particles ◽  
Brake Wear ◽  
Particle Size And Shape

Brake wear particles resulting from friction between the brake pad and disc are common in brake system. In this work brake wear particles were analyzed based on the size and shape to investigate the effects of speed and load applied to the generation of brake wear particles. Scanning electron microscopy (SEM) with energy-dispersive X-ray spectroscopy (EDX) was used to identify the size, shape and element compositions of these particles. Two types of brake pads were studied which are non-asbestos organic and semi metallic brake pads. Results showed that the size and shape of the particles generatedvary significantly depending on the applied brake load, and less significantly on brake disc speed. The wear particle becomes bigger with increasing applied brake pressure. The wear particle size varies from 300 nm to 600 µm, and contained elements such as carbon, oxygen, magnesium, aluminum, sulfur and iron.

scholarly journals Particle Morphology Analysis of Biomass Material Based on Improved Image Processing Method

2017 ◽  
Vol 2017 ◽  
pp. 1-9 ◽  
Author(s):  
Zhaolin Lu ◽  
Xiaojuan Hu ◽  
Yao Lu
Keyword(s):  
Image Processing ◽  
Particle Size ◽  
Particle Morphology ◽  
Processing Method ◽  
Image Resolution ◽  
Ultrasonic Dispersion ◽  
Image Processing Method ◽  
Size And Shape ◽  
Nominal Size ◽  
Particle Size And Shape

Particle morphology, including size and shape, is an important factor that significantly influences the physical and chemical properties of biomass material. Based on image processing technology, a method was developed to process sample images, measure particle dimensions, and analyse the particle size and shape distributions of knife-milled wheat straw, which had been preclassified into five nominal size groups using mechanical sieving approach. Considering the great variation of particle size from micrometer to millimeter, the powders greater than 250 μm were photographed by a flatbed scanner without zoom function, and the others were photographed using a scanning electron microscopy (SEM) with high-image resolution. Actual imaging tests confirmed the excellent effect of backscattered electron (BSE) imaging mode of SEM. Particle aggregation is an important factor that affects the recognition accuracy of the image processing method. In sample preparation, the singulated arrangement and ultrasonic dispersion methods were used to separate powders into particles that were larger and smaller than the nominal size of 250 μm. In addition, an image segmentation algorithm based on particle geometrical information was proposed to recognise the finer clustered powders. Experimental results demonstrated that the improved image processing method was suitable to analyse the particle size and shape distributions of ground biomass materials and solve the size inconsistencies in sieving analysis.

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