scholarly journals Structural Analysis of Carbon Materials with Low Crystallinity

TANSO ◽  
2000 ◽  
Vol 2000 (194) ◽  
pp. 261-267 ◽  
Author(s):  
Noriko Yoshizawa
Keyword(s):  
Structural Analysis ◽  
Carbon Materials ◽  
Low Crystallinity

Nano structure of low crystallinity carbon materials analyzed by using high energy X-ray diffraction

Open Physics ◽  
2009 ◽  
Vol 7 (2) ◽  
Author(s):  
Kyoichi Oshida ◽  
Tatsuo Nakazawa ◽  
Kozo Osawa ◽  
Morinobu Endo
Keyword(s):  
Carbon Materials ◽  
Lithium Ion ◽  
High Energy ◽  
Experimental Results ◽  
Disordered Materials ◽  
X Ray Diffraction ◽  
Structural Units ◽  
Nano Structure ◽  
X Ray ◽  
Low Crystallinity

AbstractIn this study, we tried to characterize a kind of low crystallinity carbon materials. The structure of polyparaphenylene(PPP)-based carbon was analyzed by means of high energy X-ray diffraction using the apparatus of SPring-8. The experimental results revealed the existence of basic structural units (BSU) in the highly disordered materials like PPP-based carbon. It is thought that the PPP-based carbons consist of small turbostratic particles, which have a few piled up poly-aromatic layers. The structure of the PPP-based carbon which seemed to be amorphous was estimated to have hexagonal carbon layers with the size of up to 1 nm. The pores in the PPP-based carbon seem to be clearances formed among the BSUs and amorphous carbon. The pore size of PPP-based carbon was estimated from the result of N2 absorption measurement. The experimental results suggested that the lithium ion charge mechanism in the PPP-based carbon differs from that in graphite.

scholarly journals Research And Characterization Of Cu – Graphene, Cu-CNT’s Composites Obtained By Mechanical Synthesis

2015 ◽  
Vol 60 (3) ◽  
pp. 1929-1934
Author(s):  
P. Kwaśniewski ◽  
G. Kiesiewicz ◽  
T. Knych ◽  
A. Mamala ◽  
M. Gniełczyk ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Structural Analysis ◽  
Carbon Materials ◽  
Base Material ◽  
Cold Drawing ◽  
Copper Matrix ◽  
Synthesis Process ◽  
Drawing Process ◽  
Mechanical Synthesis ◽  
Carbon Particles

Abstract Currently we can observe a worldwide trend to find new materials with extraordinary properties. In particular these researches are aimed to find a method to improve electrical conductivity, mechanical properties, corrosion resistance and rheological behavior of known materials. This effect can be achieved by a synthesis of modern carbon materials with metals. In this paper authors presented research results of synthesis process for Cu-graphene and Cu-CNT’s composites obtained by the mechanical synthesis in cold drawing process. The article presents also the results of electrical conductivity measurements and structural analysis of carbon particles presence in copper matrix. The research has shown that obtained composites have electrical conductivity lower than used copper base material. Additionally, the structural analysis has shown that after the drawing process carbon materials particles are mechanically pressed into Cu in the matrix, and these particles do not participate in the current flow, creating an actual barrier for electrons transport.

scholarly journals Chemical and Structural Analysis of Carbon Materials Subjected to Alkaline Oxidation

ACS Omega ◽  
2019 ◽  
Vol 4 (20) ◽  
pp. 18725-18733 ◽  
Author(s):  
Filipa R. F. Simoes ◽  
Edy Abou-Hamad ◽  
Jasmin Smajic ◽  
Nitin M. Batra ◽  
Pedro M. F. J. Costa
Keyword(s):  
Structural Analysis ◽  
Carbon Materials ◽  
Alkaline Oxidation

Structural analysis of the surface-layer protein of spirillum serpens by high-resolution electron microscopy

1983 ◽  
Vol 41 ◽  
pp. 738-739
Author(s):  
W. H. Wu ◽  
R. M. Glaeser
Keyword(s):  
Electron Microscopy ◽  
Surface Layer ◽  
Structural Analysis ◽  
High Resolution ◽  
Low Dose ◽  
High Resolution Electron Microscopy ◽  
Optical Diffraction ◽  
Surface Layer Protein ◽  
Morphological Unit ◽  
Resolution Electron

Spirillum serpens possesses a surface layer protein which exhibits a regular hexagonal packing of the morphological subunits. A morphological model of the structure of the protein has been proposed at a resolution of about 25 Å, in which the morphological unit might be described as having the appearance of a flared-out, hollow cylinder with six ÅspokesÅ at the flared end. In order to understand the detailed association of the macromolecules, it is necessary to do a high resolution structural analysis. Large, single layered arrays of the surface layer protein have been obtained for this purpose by means of extensive heating in high CaCl2, a procedure derived from that of Buckmire and Murray. Low dose, low temperature electron microscopy has been applied to the large arrays.As a first step, the samples were negatively stained with neutralized phosphotungstic acid, and the specimens were imaged at 40,000 magnification by use of a high resolution cold stage on a JE0L 100B. Low dose images were recorded with exposures of 7-9 electrons/Å2. The micrographs obtained (Fig. 1) were examined by use of optical diffraction (Fig. 2) to tell what areas were especially well ordered.

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