Fibers capable of generating axial contraction are commonly seen in nature and engineering applications. Despite the broad applications fiber actuators, it is still very challenging to fabricate actuators with combined large actuation strain, fast response speed, high power density. Here, we report fabrication a liquid crystal elastomer (LCE) microfiber using facile electrospinning technique. Owing extremely small size LCE microfibers, they can generate strain (~60 percent) speed (<0.2...

A 3D printing strategy to fabricate functionally graded liquid crystal elastomer is developed.

Despite the great advancement in designing diverse soft robots, they are not yet as dexterous animals many aspects. One challenge is that still lack compact design of an artificial motor unit with a comprehensive performance can be conveniently fabricated, although recently developed muscles have shown excellent properties one or two Herein, based on gold-coated ultrathin liquid crystal elastomer (LCE) film. Subject to voltage, Joule heating generated by gold film increases temperature LCE...

Biohybrid is a newly emerging and promising approach to construct soft robotics machines with novel functions, high energy efficiency, great adaptivity intelligence. Despite many unique advantages of biohybrid systems, it well known that most systems have relatively short lifetime, require complex fabrication process, only remain functional careful maintenance. Herein, we introduce simple method create highly robust power-free mechanoluminescence, by encapsulating dinoflagellates,...

For the first time, ultrasonic surface rolling processing (USRP) technology was applied to a real bearing raceway, and finite element simulation model for USRP on raceway established. Practical tests were conducted evaluate integrity of before after treatment. The parameters optimized using Taguchi-gray correlation analysis. results show that optimal process 7224 are: an amplitude 10 μm, static pressure 2400 N, spindle speed 45 rad/min, times 7. In USRP, residual compressive stress from...

Wurtzite ZnO has many potential applications in optoelectronic devices, and the hydrogenated exhibits excellent photoelectronic properties compared to undoped ZnO; however, structure of H-related defects is still unclear. In this article, effects hydrogen-plasma treatment subsequent annealing on electrical optical films were investigated by a combination Hall measurement, Raman scattering, photoluminescence. It found that two types hydrogen-related defects, namely, interstitial hydrogen...

Additive manufacturing of electrically responsive soft actuators is great importance in designing and constructing novel robots machines. However, there are very limited options for 3D-printable materials. Herein, we report a strategy 3D printing polyvinyl chloride (PVC) gel that controllable. We print jellyfish-like actuator from PVC ink, which can achieve 130° bending less than 5 s. With the multi-material technique, have further printed with stiffness gradient generate undulatory motion....

Mechanosensing, the transduction of extracellular mechanical stimuli into intracellular biochemical signals, is a fundamental property living cells. However, endowing synthetic materials with mechanosensing capabilities comparable to biological levels challenging. Here, we developed ultrasensitive and robust mechanoluminescent composites using hydrogels embedded dinoflagellates, unicellular microalgae near-instantaneous bioluminescent response stress. Not only did dinoflagellates retain...

We demonstrate the reduced low turn-on voltage of perovskite light-emitting diodes (PeLEDs) with methanol (MeOH) treated poly(3,4-ethylenedioxythiophene):polystyrene sulfonate (PEDOT:PSS) as a hole transport layer (HTL). The MeOH PEDOT:PSS presents improved injection through reducing contact barrier between HTL and CH3NH3PbBr3 emitting without sacrificing quality film, which was characterized by X-ray diffraction, scanning electron microscopy, time-resolved photoluminescence analysis....

The layout design of communication satellite is a complex iterative process, which involves all subsystems and products. As the top-level work design, affects performances whole satellite. to place given in one (or more) limited structure space according certain geometric functional restrictions, result needs meet conditions each constraint. This paper will be oriented module, comb process elements. presents constraint condition quantitatively studies construction digital model design....

&lt;div&gt;To further optimize the automatic emergency braking for pedestrian (AEB-P) control algorithm, this study proposes an AEB-P hierarchical strategy considering road adhesion coefficient. First, extended Kalman filter is used to estimate coefficient, and recursive least square method predict trajectory. Then, a safety distance model influence factor of coefficient proposed adapt different conditions. Finally, desired deceleration converted into pressure current requirements electric...

For emulation of the chemical kinetic combustion phenomena and physical properties S-8 POSF 4734 Jet-A 4658, two surrogate fuels were formulated by directly matching their molecular structure functional groups. The same groups, CH3, CH2, CH, C, phenyl, chosen to formulate surrogates with n-dodecane/2,5-dimethylhexane (0.581/0.419 mole fraction) n-dodecane/2,5-dimethylhexane/toluene (0.509/0.219/0.272 fraction), respectively. numerical results using compared experimental data predicted other...

We demonstrate the broadband visible organic photodetectors (OPDs) by introducing a non-fullerene acceptor of 3,9-bis(2-methylene-(3-(1,1dicyanomethylene)-indanone))-5,5,11,11-tetrakis(4-hexylphenyl)-dithieno[2,3d:2,3'-d']-s-indaceno[1,2-b:5,6-b']dithiophene (ITIC) into bulk heterojunction (BHJ) based on conventional system poly(3-hexylthiophene-2,5-diyl) (P3HT):[6,6]-phenyl C71-butyric acid methyl ester (PC71BM) .The resultant OPDs exhibit specific detectivity beyond 1012 Jones in whole...

It is difficult for current camouflage coatings to realize visible-infrared-compatible stealth. To solve this problem, we develop a film based on dielectric/metal/dielectric (D/M/D) structure, which shows high visible (0.4 ∼ 0.8 μm) transmittance and infrared (3 14 reflectance (i.e., low emittance). When applied coating, because of the emittance film, stealth can be realized. The thickness each layer ZnS/Ag/ZnS designed using particle swarm optimization method. By thermal evaporation,...

Electrostatic adhesion, also known as electro-adhesion, has been employed in many robotic devices for dynamic adhesion and shows fast switching between adhesive/non-adhesive states on demand. However, a well-known challenge electro-adhesion is to achieve strong rough surfaces with reasonably low operating voltage. Herein, we report simple strategy fabricate pads based polyvinyl chloride (PVC) gel, which can (ten times stronger than silicone rubber-based pads) conductive relatively voltage...

Impact toughness has a strong size effect, which restricts the accurate evaluation of material and safety structural design. However, our understanding internal mechanical mechanism that influences effect remains incomplete. To fill this gap, paper adopts method combining experiment, theory, simulation. From point view dependence plastic fracture behavior on stress state, impact (αk) was studied. Firstly, Charpy tests different sizes were carried out Al 6061. αk divided into cracking...