The flexible triboelectric nanogenerator (TENG) has promising applications in portable electronic devices and micro wireless sensors. However, complex fabrication processes, high cost, and difficulty in coupling with the human body are still the challenges for the further development of TENG. Herein, a flexible double‐sided patterned titanium nitride/polydimethylsiloxane (DSP‐TiN/PDMS) composite film is prepared by a simple and low‐cost sandpaper template method. The double‐sided microporous structure on the PDMS increases the effective contact area and promotes more charge storage on the PDMS surface, thus improving the output performance of TENG. With the introduction of conductive TiN nanoparticles, the effective thickness of the composite film can be reduced, leading to the increase of the capacitance value of TENG. Therefore, the TENG fabricated under the conditions of optimized filling content and surface patterning microstructure can generate a high open‐circuit voltage of 51.8 V and a short‐circuit current of 36.8 μA, as well as a peak power of 11.25 μW. Furthermore, the proposed TENG can also achieve effective energy harvesting in human motions. This easy‐to‐prepare DSP‐TiN/PDMS composite film opens up a feasible way for the construction of high output performance TENG and presents promising applications in micro wearable devices.
Background Therapeutic erythrocytapheresis (TEA) is a medical technology that separates erythrocytes from whole blood and has been used in various hematological conditions. However, reports on the use of TEA to treat chronic mountain sickness (CMS) are lacking. The aim of the present study was to evaluate the efficacy, safety, and use of TEA in treatment of CMS. Material/Methods A total of 32 patients living in the Shigatse area of Tibet (altitude 4000 m) who had CMS were treated with TEA. Clinical data, CMS score, Borg dyspnea score, 6-min walking test score, and NYHA classification values were collected prior to and after TEA therapy. Results TEA treatment significantly increased SpO 2 (93.8±2.6 vs. 80.5±5.8%, P <0.001) and decreased red blood cell (5.77±0.70 vs. 7.48±0.67×10 12 /L, P <0.001), hematocrit (53.8±5.6 vs. 69.2±4.8%, P <0.001) and hemoglobin (178±16 vs. 236±14 g/L, P <0.001). Significantly lower systolic and diastolic blood pressure were also noted ( P <0.001). Echocardiography showed higher left ventricle diameter (4.6±0.4 vs. 4.4±0.5 cm, P <0.01). TEA markedly decreased CMS scores (0.45±0.85 vs. 7.58±2.31, P <0.001), Borg dyspnea scale scores (0.48±0.73 vs. 0.88±0.81, P <0.001), and NYHA classification scores ( P <0.05). Additionally, there was marked improvement in the 6-min walking test scores (578.5±83.1 vs. 550.4±79.0 m, P <0.001). The procedure was well tolerated, with no complications. Conclusions Our novel approach of treating CMS patients with TEA safely and effectively reduced erythrocytosis, which remains a fundamental challenge in CMS patients.
A self‐rebounded hybrid energy harvester from human foot motion is investigated. The hybrid energy harvester integrates electromagnetic generators (EMG), piezoelectric nanogenerators (PENG), and triboelectric nanogenerators (TENG) between the two magnetic poles. The harvester uses a pair of mutually exclusive magnetic poles instead of spring‐mass to realize reciprocating motion, which is designed to grow 6 cm, width 5 cm, and height 4 cm. Under low frequency (4 Hz), EMG, PENG, and TENG can deliver a high output power of 6.49 mW, 0.168 µW, and 90.72 µW, respectively. After charging the energy harvesting circuit, the capacitor can continuously output a stable 5 V DC voltage, and the charging performance of the harvester is better than that of a single nanogenerator unit. Besides, the harvester can continuously light up 80 LED lights. After carrying the harvester and jogging for a certain distance, a pedometer module is powered. It shows that the designed self‐rebounding human motion foot energy harvester has certain feasibility in the practical application of wearable devices. The device can be easily assembled under the shoes, demonstrating the great application prospects of the harvester as a sustainable self‐power device for wearable and portable electronics.
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