The content of this article comes from the Internet, if it is inconsistent with the actual situation or there is infringement, please contact to delete. This article is only published in today's headlines, please do not move.
preface
In the development of the field of carbon nanotubes, carbon nanotubes, as a material with excellent performance, have been attracting research and attention from scientists since the existence of Japanese scientist Iijima discovered their existence in 1991. With excellent characteristics such as high Young's modulus, high electrical conductivity, perfect structure and chemical stability, carbon nanotubes have been widely used in composite materials, electronic technology, bioengineering, environmental protection and other fields. However, in the actual preparation process of carbon nanotubes, perfect carbon nanotubes are often difficult to obtain, and their preparation process will inevitably contain various defects, such as atomic vacancies, five-seven ring defects and other non-topological structural defects, which seriously affect the performance of carbon nanotubes. Therefore, it is particularly important to conduct in-depth simulation studies of defective carbon nanotubes.
The effect of multiple defects on the properties of carbon nanotubes
In the preparation of carbon nanotubes, the presence of defects is inevitable. These defects include single and diatomic vacancy defects, as well as polyatomic vacancy defects distributed along axial and circumferential directions. These defects will have an important impact on the mechanical properties and elastic modulus of carbon nanotubes. Studies have shown that the occurrence of diatomic vacancy defects reduces the ultimate stress and ultimate strain of carbon nanotubes, and reduces the elastic modulus by a certain proportion. However, the types of polyatomic vacancy defects have different effects on the elastic modulus of carbon nanotubes. In particular, the circumferentially distributed polyatomic vacancy defects have a more significant effect on the modulus of elasticity, showing a greater decrease amplitude.
Oscillation behavior is influenced by a variety of factors
In the study, it was found that the oscillation behavior of C60 molecules in carbon nanotubes is affected by a combination of factors, including ambient temperature, number of carbon tube wall layers, defects, and axial prestress. The oscillation frequency of the C60 molecule changes with the increase of the number of missing atoms, and this change shows a certain regularity, first increasing and then decreasing. Under the action of axial prestress, the oscillation frequency of C60 molecules also changes accordingly. These findings provide an important reference for further understanding of the oscillation behavior inside carbon nanotubes.
conclusion
In this study, the mechanical behavior and oscillation behavior of C60 molecules in defective carbon nanotubes and carbon nanopods were studied through molecular dynamics simulation. It is found that different types of defects will have different degrees of influence on the elastic modulus of carbon nanotubes, especially when the polyatomic vacancy defects are distributed in the circumferential direction. At the same time, the oscillation behavior of C60 molecules is affected by many factors, such as defects, axial prestress, and ambient temperature. These results provide a theoretical reference and guidance for the preparation and application of carbon nanotubes. In future research, the influence of different defects on the properties of carbon nanotubes can be further explored, and the influence of more factors on oscillation behavior can be further explored.
The above content and materials are derived from the Internet, and the author of this article does not intend to target or allude to any real country, political system, organization, race, individual. The above does not mean that the author of this article endorses the laws, rules, opinions, behaviors in the article and is responsible for the authenticity of the relevant information. The author of this article is not responsible for any issues arising above or related to any of the above, nor does it assume any direct or indirect legal liability.