Uo Motohiro, Hasegawa Tomoka, Akasaka Tsukasa, Tanaka Isao, Munekane Fuminori, Omori Mamoru, Kimura Hisamichi, Nakatomi Reiko, Soga Kohei, Kogo Yasuo, Watari Fumio
Department of Biomedical Materials and Engineering, Graduate School of Dental Medicine, Hokkaido University, Kita-ku, Sapporo, Japan.
Biomed Mater Eng. 2009;19(1):11-7. doi: 10.3233/BME-2009-0558.
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.
在80兆帕的烧结压力下，于2000摄氏度通过放电等离子烧结（SPS）处理，获得了三种不含任何粘结剂的多壁碳纳米管（MWCNT）整体材料。采用了三种不同直径的多壁碳纳米管进行SPS处理：细径（斜圈20 - 30纳米，韩国CNT有限公司）、粗径（斜圈100纳米，日本纳米碳技术有限公司）和球形细径（斜圈20 - 30纳米，颗粒直径 = 1 - 3微米，日本清水公司）。扫描电子显微镜（SEM）观察证实，这些材料在SPS处理后保持了原始碳纳米管粉末的纳米级管状微观结构。使用球形多壁碳纳米管制备出了密度最高的整体材料。通过动态硬度测试评估了该材料的力学性能。整体材料的弹性模量不取决于多壁碳纳米管的差异，但球形多壁碳纳米管的硬度高于粗径多壁碳纳米管。球形多壁碳纳米管的高密度和高硬度是由于其球形颗粒在SPS过程中的高堆积密度所致。因此，球形多壁碳纳米管对于通过SPS工艺制备多壁碳纳米管整体材料最为有用，并有人提出其可作为骨替代材料和骨组织工程支架材料应用。
