scholarly journals Effect of Carbon Nanotubes on Mechanochemical Synthesis of d-Metal Carbide Nanopowders and Nanocomposites

2019 ◽  
Vol 20 (1) ◽  
pp. 5-51 ◽  
Author(s):  
O Nakonechna ◽  
M Dashevskyi ◽  
O Boshko ◽  
V Zavodyannyi ◽  
N Belyavina
Keyword(s):  
Carbon Nanotubes ◽  
Mechanochemical Synthesis ◽  
Metal Carbide

Mechanochemical Synthesis of Fe-Based Nanocomposites and Their Application in the Catalytic Formation of Carbon Nanostructures

2006 ◽  
Vol 111 ◽  
pp. 183-186 ◽  
Author(s):  
B.H. Liu ◽  
J. Ding ◽  
Z.L. Dong ◽  
Zeng Yong Zhong ◽  
Jian Yi Lin ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Particle Size ◽  
Iron Oxides ◽  
Mechanochemical Synthesis ◽  
Carbon Nanostructures ◽  
Catalytic Properties ◽  
Mechanochemical Process ◽  
Fe Nanoparticles

Mechanochemical process was employed to prepare Fe/MgO and Fe/NaCl nanocomposites. The carbon nanostructures (nanotubes and carbon-encapsulated Fe nanoparticles) were successfully synthesized using two nanocomposites as the catalyst. Our wok revealed that the morphology of Fe nanoparticles in the Fe/MgO nanocomposites depended on the distribution and particle size of iron oxides in the precursors. The size of Fe nanoparticles greatly affected their catalytic properties and the morphologies of carbon nanotubes. The successful carbon encapsulation of Fe nanoparticles was achieved by using the mechanochemically derived Fe/NaCl catalyst.

Structural phenomena in the growth of carbon nanotubes

1993 ◽  
Vol 51 ◽  
pp. 750-751
Author(s):  
Jun Jiao
Keyword(s):  
Carbon Nanotubes ◽  
Growth Mechanism ◽  
Carbonaceous Material ◽  
Cluster Growth ◽  
Structural Elements ◽  
Rich Variety ◽  
Different Shapes ◽  
Point To Point

HREM studies of the carbonaceous material deposited on the cathode of a Huffman-Krätschmer arc reactor have shown a rich variety of multiple-walled nano-clusters of different shapes and forms. The preparation of the samples, as well as the variety of cluster shapes, including triangular, rhombohedral and pentagonal projections, are described elsewhere.The close registry imposed on the nanotubes, focuses attention on the cluster growth mechanism. The strict parallelism in the graphitic separation of the tube walls is maintained through changes of form and size, often leading to 180° turns, and accommodating neighboring clusters and defects. Iijima et. al. have proposed a growth scheme in terms of pentagonal and heptagonal defects and their combinations in a hexagonal graphitic matrix, the first bending the surface inward, and the second outward. We report here HREM observations that support Iijima’s suggestions, and add some new features that refine the interpretation of the growth mechanism. The structural elements of our observations are briefly summarized in the following four micrographs, taken in a Hitachi H-8100 TEM operating at an accelerating voltage of 200 kV and with a point-to-point resolution of 0.20 nm.

Carbon nanotubes: Twist 'n' roll

Nature China ◽  
2007 ◽  
Author(s):  
Rachel Pei Chin Won
Keyword(s):  
Carbon Nanotubes
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