Multiwalled carbon nanotube monoliths prepared by spark plasma sintering (SPS) and their mechanical properties.
Three types of multiwalled carbon nanotube (MWCNT) monoliths without any binders were obtained by spark plasma sintering (SPS) treatment at 2000 degrees C under 80 MPa sintering pressure. Three MWCNTs with different diameters: thin (slashed circle20-30 nm, CNT Co., Ltd., Korea), thick (slashed circle100 nm, Nano Carbon Technologies Co., Ltd., Japan) and spherical thin (slashed circle20-30 nm, granulated diameter = 1-3 microm, Shimizu Corporation, Japan) were employed for SPS. SEM observation confirmed that these materials maintained the nanosized tube microstructure of raw CNT powder after SPS treatment. The densest monolith was prepared with the spherical MWCNTs. The mechanical properties of this material were estimated by the dynamic hardness test. The elastic modulus of the monolith did not depend on the difference of MWCNTs, but the hardness of spherical MWCNTs was higher than that of thick MWCNTs. The high density and hardness of the spherical MWCNTs were caused by the high packing density during the SPS process because of its spherical granulation. Thus, the spherical MWCNTs were most useful for the MWCNT monolith preparation with the SPS process and its application as a bone substitute material and a bone tissue engineering scaffold material was suggested.
Uo
Motohiro
M
Department of Biomedical Materials and Engineering, Graduate School of Dental Medicine, Hokkaido University, Kita-ku, Sapporo, Japan. uo@den.hokudai.ac.jp
Hasegawa
Tomoka
T
Akasaka
Tsukasa
T
Tanaka
Isao
I
Munekane
Fuminori
F
Omori
Mamoru
M
Kimura
Hisamichi
H
Nakatomi
Reiko
R
Soga
Kohei
K
Kogo
Yasuo
Y
Watari
Fumio
F
D003460:Crystallization / Q000379:methods*; D055119:Elastic Modulus; D004563:Electrochemistry / Q000379:methods*; D005740:Gases / Q000737:chemistry; D006244:Hardness; D006358:Hot Temperature; D046911:Macromolecular Substances / Q000737:chemistry; D008422:Materials Testing; D008968:Molecular Conformation; D036103:Nanotechnology / Q000379:methods*; D037742:Nanotubes, Carbon / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D013499:Surface Properties; D013718:Tensile Strength; D014025:Titanium / Q000737:chemistry*
D005740:Gases; D046911:Macromolecular Substances; D037742:Nanotubes, Carbon; C009495:titanium dioxide; D014025:Titanium