A multi-layer core-shell structure CoFeO@FeC@NiO composite with high broadband electromagnetic wave-absorption performance.

Enhancing the absorption strength of electromagnetic waves and broadening the absorption band are constant goals in designing and preparing absorbing materials. The use of composites has shown to be a very efficient method for acquiring broadband-absorbing materials, while the construction of a core-shell structure has demonstrated a significant enhancement in absorption capability. In this paper, the nanocomposite metal-organic framework (MOF) derivative CoFeO@C with a double core-shell structure and the nanocomposite MOF derivative CoFeO@FeC@NiO with a three-layered core-shell structure have been prepared using a chemical compound.

Eye tracking and eye expression decoding based on transparent, flexible and ultra-persistent electrostatic interface.

Eye tracking provides valuable insight for analyzing visual attention and underlying thinking progress through the observation of eye movements. Here, a transparent, flexible and ultra-persistent electrostatic sensing interface is proposed for realizing active eye tracking (AET) system based on the electrostatic induction effect. Through a triple-layer structure combined with a dielectric bilayer and a rough-surface Ag nanowire (Ag NW) electrode layer, the inherent capacitance and interfacial trapping density of the electrostatic interface has been strongly enhanced, contributing to an unprecedented charge storage capability.

The Design and Evaluation of a High-Speed Jet Dispenser Driven by Single Piezoelectric Stack.

Droplet injection methods are widely used in the applications of microelectronic manufacturing, biological engineering, and 3-D printing. This work presents a new jet dispenser driven by a single piezoelectric stack that enables the capability of drop-on-demand patterning under a high working frequency (500 Hz). Due to the special designs of the jet dispenser, a broad range of liquids, whose viscosities span more than four orders of magnitude (21-665 320 cps), can be jetted.

Reversible and High-Temperature-Stabilized Strain in (Pb,La)(Zr,Sn,Ti)O Antiferroelectric Ceramics.

Antiferroelectric (AFE) materials have a tremendous advantage as smart materials and large-strain actuators due to their unique reversible characteristic electric-field-induced strain (electrostrain) responses in comparison to piezoelectric effect and electrostriction. A key limitation to today's AFE actuators, however, is the poor temperature stability of electrostrain. In this work, a large reversible strain of 0.

Giant Negative Electrocaloric Effect in (Pb,La)(Zr,Sn,Ti)O Antiferroelectrics Near Room Temperature.

(PbLa)(Zr SnTi)O (PLZST) antiferroelectric ceramics with x = 0.75-0.90 have been fabricated and found to be a novel electrocaloric material system with a giant negative electrocaloric effect (Δ T = -11.

Phase transformations, anisotropic pyroelectric energy harvesting and electrocaloric properties of (Pb,La)(Zr,Sn,Ti)O single crystals.

(Pb,La)(Zr,Sn,Ti)O (PLZST) single crystals with their chemical composition located at the tetragonal antiferroelectric region are grown via the flux method in a PbO-PbF-BO mixture. Segregation of the Ti component in the as-grown crystals is observed due to the strong affinity between the oxygen anion and Ti ions. The critical electric field of the antiferroelectric to ferroelectric phase transition is determined to be about 0.

Ultrasonic micro-motor with multilayer piezoelectric ceramic and chamfered driving tips.

In this study, an oblate-type ultrasonic micro-motor with multilayer piezoelectric ceramic and chamfered driving tips was proposed and experimentally researched. The micro-motor works based on the standing-wave principle and has a higher rotary speed than the traditional standing-wave one in principle, reaching a rotary speed of 2100 r/min in this study at the voltage of 20 V. When the micro-motor rotates, single phase alternating current is required, namely, V=Asinωt, and exchanging the signal wire and ground wire will not change the rotary direction of the motor, which reinforces the safety and the compaction of this motor.

Development of an ultrasonic linear motor with ultra-positioning capability and four driving feet.

This paper presents a novel linear piezoelectric motor which is suitable for rapid ultra-precision positioning. The finite element analysis (FEA) was applied for optimal design and further analysis, then experiments were conducted to investigate its performance. By changing the input signal, the proposed motor was found capable of working in the fast driving mode as well as in the precision positioning mode.

A screw-thread-type ultrasonic actuator based on a Langevin piezoelectric vibrator.

A novel screw-thread-type ultrasonic actuator based on a Langevin piezoelectric vibrator, with an assembly comprised a threaded shaft, is presented. The bolt-clamped Langevin vibrator consists of 4 chips of PZT ceramics and generates more energy with a certain input power. The threads of the stator multiply the linear force and position resolution, and the threaded rod is rotated directly to achieve linear movement without additional mechanical conversion.

A disk-pivot structure micro piezoelectric actuator using vibration mode B11.

Micro piezoelectric actuator using vibration mode B(11) (B(mn), where m is the number of nodal circles, n is the nodal diameters) is designed. Different from conventional wobble-type ultrasonic motor using piezoelectric rod or cylinder, piezoelectric disc is used to excite wobble modes and metal cylinder stator is used to amplify the transverse displacement, metal rod rotor is actuated to rotate. The outer diameter of the actuator is 14mm.

Simulations and analysis of a piezoelectric micropump.

A number of micropumps have been proposed in the last few years based on different actuating principles and fabricated by different technologies. However, many of those micropumps have been designed taking into account primarily available microfabrication technologies rather than appropriate pump performance analysis. In fact, not all papers are available in the literature presenting theoretical models usable to describe the functioning and predict the performance of those micropumps.

High resolution miniaturized stepper ultrasonic motor using differential composite motion.

Experiments show that there is a limited minimum stepped angle in ultrasonic motors (USM). The research on the minimum angle of stepper USM with 15 mm in diameter and wobbling mode is being carried out. This paper presents a novel way to decrease the minimum stepped angle of USM based on the principle of differential composite motion (DCM), i.