The damage mechanisms of carbon nanotubes are considered to be the oxidation by Joule heating and migration of carbon atoms by high-density electron flows. In this study, a high current density testing system was designed and applied to multiwalled carbon nanotubes (MWCNTs) collected at the gap between thin-film electrodes. Local evaporation of carbon atoms occurred on the cathode side of the MWCNTs under relatively low current density conditions, and the center area of the MWCNTs under high current density conditions. The damaged morphology could be explained by considering both Joule heating and electromigration behavior of MWCNTs.

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Background: Primary cardiac myxofibrosarcoma is quite rare and commonly arises in the left atrial. Myxofibrosarcoma is an aggressive and has high mortality because of high rate of recurrence. It is considered that complete surgical resection is important but effective treatment options are not established. Case presentation: We report a case of 75-year-old woman who developed myxofibrosarcoma spreading to left atrial and pericardium. To prevent sudden death by obstruction of mitral valve, we performed surgical resection of the tumor. The patient developed brain metastasis at two months after surgery, and eventually passed away due to brain hemorrhage at three postoperative months. Conclusion: In this report, we described a very rare case of primary cardiac myxofibrosarcoma located not only in the left atrial but also in the pericardium. To prevent the recurrence of myxofibrosarcoma, combination of surgery, radiotherapy and chemotherapy should be needed.

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