5 research outputs found
Self-Powered Nanocomposites under an External Rotating Magnetic Field for Noninvasive External Power Supply Electrical Stimulation
Electrical
stimulation in biology and gene expression has attracted
considerable attention in recent years. However, it is inconvenient
that the electric stimulation needs to be supplied an implanted power-transported
wire connecting the external power supply. Here, we fabricated a self-powered
composite nanofiber (CNF) and developed an electric generating system
to realize electrical stimulation based on the electromagnetic induction
effect under an external rotating magnetic field. The self-powered
CNFs generating an electric signal consist of modified MWNTs (m-MWNTs)
coated Fe<sub>3</sub>O<sub>4</sub>/PCL fibers. Moreover, the output
current of the nanocomposites can be increased due to the presence
of the magnetic nanoparticles during an external magnetic field is
applied. In this paper, these CNFs were employed to replace a bullfrog’s
sciatic nerve and to realize the effective functional electrical stimulation.
The cytotoxicity assays and animal tests of the nanocomposites were
also used to evaluate the biocompatibility and tissue integration.
These results demonstrated that this self-powered CNF not only plays
a role as power source but also can act as an external power supply
under an external rotating magnetic field for noninvasive the replacement
of injured nerve
Rotating-Disk-Based Hybridized Electromagnetic–Triboelectric Nanogenerator for Sustainably Powering Wireless Traffic Volume Sensors
Wireless
traffic volume detectors play a critical role for measuring
the traffic-flow in a real-time for current Intelligent Traffic System.
However, as a battery-operated electronic device, regularly replacing
battery remains a great challenge, especially in the remote area and
wide distribution. Here, we report a self-powered active wireless
traffic volume sensor by using a rotating-disk-based hybridized nanogenerator
of triboelectric nanogenerator and electromagnetic generator as the
sustainable power source. Operated at a rotating rate of 1000 rpm,
the device delivered an output power of 17.5 mW, corresponding to
a volume power density of 55.7 W/m<sup>3</sup> (<i>P</i><sub>d</sub> = <i>P</i>/<i>V</i>, see Supporting
Information for detailed calculation) at a loading resistance of 700
Ω. The hybridized nanogenerator was demonstrated to effectively
harvest energy from wind generated by a moving vehicle through the
tunnel. And the delivered power is capable of triggering a counter <i>via</i> a wireless transmitter for real-time monitoring the
traffic volume in the tunnel. This study further expands the applications
of triboelectric nanogenerators for high-performance ambient mechanical
energy harvesting and as sustainable power sources for driving wireless
traffic volume sensors
Self-Powered Safety Helmet Based on Hybridized Nanogenerator for Emergency
The
rapid development of Internet of Things and the related sensor
technology requires sustainable power sources for their continuous
operation. Scavenging and utilizing the ambient environmental energy
could be a superior solution. Here, we report a self-powered helmet
for emergency, which was powered by the energy converted from ambient
mechanical vibration via a hybridized nanogenerator that consists
of a triboelectric nanogenerator (TENG) and an electromagnetic generator
(EMG). Integrating with transformers and rectifiers, the hybridized
nanogenerator can deliver a power density up to 167.22 W/m<sup>3</sup>, which was demonstrated to light up 1000 commercial light-emitting
diodes (LEDs) instantaneously. By wearing the developed safety helmet,
equipped with rationally designed hybridized nanogenerator, the harvested
vibration energy from natural human motion is also capable of powering
a wireless pedometer for real-time transmitting data reporting to
a personal cell phone. Without adding much extra weight to a commercial
one, the developed wearing helmet can be a superior sustainable power
source for explorers, engineers, mine-workers under well, as well
as and disaster-relief workers, especially in remote areas. This work
not only presents a significant step toward energy harvesting from
human biomechanical movement, but also greatly expands the applicability
of TENGs as power sources for self-sustained electronics
Self-Powered Acceleration Sensor Based on Liquid Metal Triboelectric Nanogenerator for Vibration Monitoring
An acceleration sensor is an essential
component of the vibration
measurement, while the passivity and sensitivity are the pivotal features
for its application. Here, we report a self-powered and highly sensitive
acceleration sensor based on a triboelectric nanogenerator composed
of a liquid metal mercury droplet (LMMD) and nanofiber-networked polyvinylidene
fluoride (nn-PVDF) film. Due to the ultrahigh surface-to-volume ratio
of nn-PVDF film and high surface tension, high mass density, high
elastic as well as mechanical robustness of LMMD, the open-circuit
voltage and short-circuit current reach up to 15.5 V and 300 nA at
the acceleration of 60 m/s<sup>2</sup>, respectively. The acceleration
sensor has a wide detection range from 0 to 60 m/s<sup>2</sup> with
a high sensitivity of 0.26 V·s/m<sup>2</sup>. Also, the output
voltage and current show a negligible decrease over 200,000 cycles,
evidently presenting excellent stability. Moreover, a high-speed camera
was employed to dynamically capture the motion state of the acceleration
sensor for insight into the corresponding work mechanism. Finally,
the acceleration sensor was demonstrated to measure the vibration
of mechanical equipment and human motion in real time, which has potential
applications in equipment vibration monitoring and troubleshooting
Self-Powered Acceleration Sensor Based on Liquid Metal Triboelectric Nanogenerator for Vibration Monitoring
An acceleration sensor is an essential
component of the vibration
measurement, while the passivity and sensitivity are the pivotal features
for its application. Here, we report a self-powered and highly sensitive
acceleration sensor based on a triboelectric nanogenerator composed
of a liquid metal mercury droplet (LMMD) and nanofiber-networked polyvinylidene
fluoride (nn-PVDF) film. Due to the ultrahigh surface-to-volume ratio
of nn-PVDF film and high surface tension, high mass density, high
elastic as well as mechanical robustness of LMMD, the open-circuit
voltage and short-circuit current reach up to 15.5 V and 300 nA at
the acceleration of 60 m/s<sup>2</sup>, respectively. The acceleration
sensor has a wide detection range from 0 to 60 m/s<sup>2</sup> with
a high sensitivity of 0.26 V·s/m<sup>2</sup>. Also, the output
voltage and current show a negligible decrease over 200,000 cycles,
evidently presenting excellent stability. Moreover, a high-speed camera
was employed to dynamically capture the motion state of the acceleration
sensor for insight into the corresponding work mechanism. Finally,
the acceleration sensor was demonstrated to measure the vibration
of mechanical equipment and human motion in real time, which has potential
applications in equipment vibration monitoring and troubleshooting