Insulator polymers achieve efficient catalysis under visible light due to contact electrification.

Under the limitation of the carrier yield and mobility of semiconductor photocatalysts and the reaction domain, it seems that the photocatalytic efficiency cannot be greatly improved. Here, an efficient contact-electro-catalysis (CEC) system based on droplet triboelectric nanogenerator (TENG) is developed. Instead of using traditional semiconductor catalysts, the electric charge transferred during the electrification process of the contact between water droplets and polytetrafluoroethylene (PTFE) is used to participate in catalysis, and the output electrical signal can also monitor the degree of catalysis. The important role of light in the circulation of this CEC system is studied and discussed for the first time. It is proved that the contact electrification at the liquid-solid interface is accompanied by the generation of a large number of strong oxidizing radicals. The efficient transport of charge carriers driven by mechanical force and the active oxygen species distributed in the whole domain greatly improve the degradation rate of dyes. The experimental data show that the degradation efficiency of crystal violet (CV) reaches 90% within 38 s, and the rate constant k is as high as 3.7 min-1. This is a breakthrough in the field of catalysis.

Wireless Single-Electrode Self-Powered Piezoelectric Sensor for Monitoring.

In complex environments, there are often toxic and harmful conditions, and so self-powered sensors that use wireless access have a huge advantage. However, there is still a risk of short circuit for self-powered sensors in harsh environments. A single-electrode self-powered sensor was designed, which can be used to monitor body movements such as walking and running, as well as monitoring the motion of some mechanical devices, such as peristaltic pumps, door, and window switches. By using a threshold delay algorithm, this self-powered sensor can be connected to the phone to warn the phone user to check for theft or illegal intrusion when the door and window are opened. Further research shows that the single-electrode configuration can avoid the short-circuit behavior caused by device damage so that the self-powered sensor can still work even if it is pierced. Therefore, the wireless single-electrode self-powered sensor system has better reliability and is more applicable to harsh environments.

[A rare cause of pulmonary embolism]. / Seltene Ursache einer Lungenarterienembolie - Fall 8 / 2016.

HISTORY AND ADMISSION FINDINGS: We report on a patient with acute dyspnea after several vertebral body interventions, among others a kyphoplasty, that was performed a few days earlier. INVESTIGATIONS: In the computed tomography we prove a bilateral pulmonary embolism (cement and thrombus). There is no right heart failure. A deep vein thrombosis can be excluded by color-coded vascular ultrasound. DIAGNOSIS, TREATMENT AND COURSE: The pulmonary embolism is due to bone cement. The cement material is also found paravertebral, intraspinal and intraneuroforaminal. By conservative treatment using therapeutic anticoagulation and analgesic medication, the patient showed a rapid clinical improvement. CONCLUSIONS: In patients with cardiopulmonary symptoms after vertebroplasty and kyphoplasty, pulmonary embolism due to bone cement should be considered as a possible cause. The therapy depends on the extent of the cement embolism and the symptoms of the patient.