Photo-illumination hardening of fullerene crystals

富勒烯晶体的光照明硬化

• 批准号: 10650670
• 负责人: KOJIMA Kenichi
• 金额: $ 2.24万
• 依托单位: Yokohama City University, Faculty of Science
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10650670/
• 关键词: Mechanical Properties of fullerene crystals; Strength of fullerene crystals; Raman peaks of fullerene crystals; Dislocations in fullerene crystals; C60膜のラマン分光; フラーレン結晶; 結晶の強度; 光ポリマー; 光照射硬化; 転位; 微小かたさ; C_<60>結晶; C_<70>結晶

We carried out the experiments of Vickers micro-hardness of C60 and C70 crystals. As results, we have found that the micro-hardness of C60 and C70 crystals increased after they are illuminated with white light. We call this phenomenon "Photo-illumination hardening". The results are as following,1. The hardness increases with illumination of time, and then approaches a constant value.2. The hardening depends on the specimen temperature, and disappears at temperatures higher than 400K.3. The hardness strongly depends on the wavelength of illumination of light. The magnitude of the hardness reaches a maximum at 700nm.4. The Raman peaks of C60 crystals, which were illuminated as a function of illumination time, shift from an intrinsic peak 1469cmィイD1-1ィエD1 to a photo-polymerized peak 1460 cmィイD1-1ィエD1 via 1465 cmィイD1-1ィエD1 and 1464 cmィイD1-1ィエD1.5. In case of C70 crystals, we also observed the same kinds of behaviors due to photo-illumination. although the illumination time needs more longer.From these results, we conclude the hardening is due to the photo-induced polymers of C60 or C70.

对C60和C70晶体进行了维氏显微硬度实验。结果发现，C60和C70晶体经白色光照射后，显微硬度有所增加。我们称这种现象为“光照射硬化”。结果表明：1.硬度随光照时间的增加而增加，然后趋于一个恒定值.硬化取决于试样的温度，并在高于400 K的温度下消失。硬度很大程度上取决于光照射的波长。硬度的大小在700 nm处达到最大值。C60晶体的拉曼峰，其作为照射时间的函数被照射，从本征峰1469 cm Raman D1-1 Raman D1经由1465 cm Raman D1 - 1 Raman D1和1464 cm Raman D1 -1 Raman D1.5移动到光聚合峰1460 cm Raman D1-1 Raman D1。在C70晶体的情况下，我们也观察到由于光照射的相同种类的行为。从这些结果可以推断，硬化是由于光致聚合物C60或C70。

项目成果

H. Sakuma, M. Tachibana, H. Sugiura, K. Kojima, S. Ito, T. Sekiguchi and Y. Achiba: "Growth and structures of C60 shells."J. Materials Research. 12. 1545-1550 (1997)

H. Sakuma、M. Tachibana、H. Sugiura、K. Kojima、S. Ito、T. Sekiguchi 和 Y. Achiba：“C60 贝壳的生长和结构”。

T. Komatu: "Plastic deformation of C60 single crystals"Phil. Mag. A. (印刷中). (2000)

T. Komatu：“C60 单晶的塑性变形”Phil Mag.（出版中）。

M.Tachibana,K.Kojima 他: "Photo-illumination hardening of C_<60> crstals"Journal of Applied Physocs. 82巻. 4253-4258 (1997)

M. Tachibana、K. Kojima 等人：“C_<60> 晶体的光照射硬化”，《应用物理学杂志》，第 82 卷，4253-4258（1997 年）。

K.Kojima 他: "Computer simulation of corestructure …"Jpn.J.Applied Physics. 37巻. 2608-2609 (1998)

K. Kojima 等人：“核心结构的计算机模拟……”J. 应用物理学，第 37 卷，2608-2609（1998 年）

S. Tamaki: "Computer sinuulation of stracture of screw dislocations in C60 cry stals using Girifalco putenlial"Jpn. J. Appl. Phys.. 37. 2608-2609 (1998)

S. Tamaki：“使用 Girifalco putenlial 对 C60 晶体中螺旋位错结构进行计算机模拟”Jpn。