【最新中稿作品】MXenes的等离子体分散、柔性超级电容器、柔性基板等-科技论文配图-医学动画-动画宣传片-三维机械动画制作-北京中科幻彩

For practical applications in the fields of aerospace and robotic engineering, flexible energy storage devices must be stable under environmental temperatures and different deformed situations. In this work, a mechanically stable supercapacitor (SC) at harsh ambient temperatures is synthesized by in situ polymerization of polyaniline(PANI) onto a double network hydrogel electrolyte from cross-linked polyvinyl alcohol(PVA) and polyacrylamide/acrylic acid (PAM/AA) networks. The highly integrated structure endows the supercapacitor with unprecedented mechanical performance. The devices can endure 608% tensile strain and be stretched up to 50% without noticeable hysteresis, demonstrating fatigue and fracture resistance under thousands of cyclic loads. Benefiting from an all-flexible configuration through seamless integration of the PANI electrode, the supercapacitor presents a high specific capacitance of 95.8 mF cm^–2. It can also work as an all-flexible device and maintain its stable output under complex deformations, even physical damages. Furthermore, the device delivers excellent environmental adaptability by steady electrochemical performance after operating at extreme temperatures from −60 to 100 °C. Such a versatile supercapacitor presents a potential application in integrated flexible electronic systems by powering functional devices in harsh environments.

Monitoring of the coagulation function has applications in many clinical settings. Routine coagulation assays in the clinic are sample-consuming and slow in turnaround. Microfluidics provides the opportunity to develop coagulation assays that are applicable in point-of-care settings, but reported works required bulky sample pumping units or costly data acquisition instruments. In this work, we developed a microfluidic coagulation assay with a simple setup and easy operation. The device continuously generated droplets of blood sample and buffer mixture and reported the temporal development of blood viscosity during coagulation based on the color appearance of the resultant droplets. We characterized the relationship between blood viscosity and color appearance of the droplets and performed experiments to validate the assay results. In addition, we developed a prototype analyzer equipped with simple fluid pumping and economical imaging module and obtained similar assay measurements. This assay showed great potential to be developed into a point-of-care coagulation test with practical impact.

Protocatechuic acid (PCA) is a natural phenolic acid present in daily vegetables and fruits. Notably, PCA was demonstrated to inhibit the biological function of SerpinB9 (Sb9) and exhibit an excellent antitumor effect, showing great potential in cancer treatment. However, the short half-life time limits PCA’s wide application against cancers. To overcome this shortage of PCA, we integrated PCA and another natural product with strong self-assembling properties, isoguanosine (isoG), to develop a novel multifunctional supramolecular hydrogel with good biocompatibility and injectability, which remarkably lengthens the releasing time of PCA and exerts considerable anticancer effects in vitro and in vivo. Besides, we surprisingly found that PCA could not only target Sb9 but also restrain cancer development through activating the JNK/P38 pathway, decreasing the ROS level, and repairing cancer stemness. In all, our results demonstrate that this PCA-based hydrogel could act as a multifunctional hydrogel system equipped with considerable anticancer effects, providing potential local administration integrating with targeted therapy and chemotherapy in one simple modality.

Tailoring electrode–electrolyte interphases could potentially enhance the interfacial reaction for protonic ceramic fuel cells (PCFCs), and an in situ generated dense active cathode functional interlayer (CFI) via a low-cost linear current sweeping (LCS) method is developed based on the perovskite-related Sm2Ba1.33Ce0.67Cu3O9 (SBCC) cathode material. Due to the simultaneous occurrence of Ba element segregation and the densifying process at the SBCC/BZCY interface during the LCS procedure, the Ba(Zr,Ce)1−x(Sm,Y,Cu)xO3−δ (BZCSYC) phase is formed and sandwiched between two SBCC phases in the 2 μm thick CFI, promoting the protolysis to the SBCC@BZCSYC CFI–cathode interface. When assessing the SBCC cathode accompanied by the CFI based on a BaZr0.1Ce0.7Y0.2O3−δ-based single-cell, exhilarating cell performance with peak power densities (PPDs) of 1669 and 905 mW cm−2, corresponding to the interfacial polarization resistance (RP) values of 0.027 and 0.115 Ω cm2 at 700 and 600 °C, respectively, is attained. The superior cell performance, including the remarkably high PPD and the notably low RP, clearly state that SBCC is a preferential cathode alternative. The LCS technique is an advanced method to optimize the electrode interface for high-performance low-temperature PCFCs.

Fabricating high integration density, high resolution, and intrinsically stretchable patterns by patterned technologies remain challenging. Template printing enabled high-precision patterned fabrication at a facile operation. However, the pattern spacing constraint is the major limitation to high integration density. In this study, we develop an elastomer-assisted strategy to improve the template printing process, which involves patterning on the prestrain elastic substrate. This strategy overcomes the spacing limitation and enables the realization of a centimeter-scale pattern with submicron precision. Particularly, the integration density of fabricated intrinsically stretchable patterns can reach 1932 lines on a substrate of 0.5 cm2; the assembly lines with a feature size of 880 nm and an interval of 955 nm. Furthermore, we demonstrate a facile approach for constructing silver nanoparticle/liquid metal alloy composite conductive patterns. The as-prepared flexible electrodes can withstand up to 150% strain and a 2-mm bend radius. This method provides new insights into template printing technology. Additionally, it opens a route for the simultaneous construction of functional patterned arrays with large scale, high integration density, and intrinsic stretchability, which will be useful for the integrated fabrication of various flexible electronic devices.

The development of hetero-π-conjugated molecules is of significance for constructing diverse assembling superstructures based on heteroatom-related bonded or nonbonded interactions. Herein, we developed one-pot P-heteroannulation via palladium-catalyzed dual P–C bonds formation and subsequent sulfidation to construct two isomeric diphosphaperylenediimides (cis-5 and trans-5). The unique out-of-plane anisotropic π-framework induced a cumulative anisotropy with a dipole moment of up to 8.82 D for cis-5, leading to distinct supramolecular packing arrangements. Optical and electrochemical characterizations demonstrated that they showed the largest redshifts extending to 574 nm and rather low-lying LUMO levels of −4.41 eV. Furthermore, the introduced P=S moieties endowed these diphosphaperylenediimides with prominent coordination ability towards Ag+, and thus the first example of perylene diimide (PDI) core-involved metal-organic coordination polymers (MOCPs) with tunable dimensionality varying from 1D, 2D, to 3D was tactfully achieved. In view of easy accessibility and 2D layered porous structure, thus 2D (trans-5)·(AgOTf) based MOCP showed high crystallinity and good CO2 adsorption capacity with surface area of 112 m2/g. The result opens a span-new avenue for exploring rylene imide-based MOCPs and related properties by integrating P functionality.

In modern warfare, shallow-buried explosives, such as landmines and improvised explosive devices, pose serious threats to civil/military vehicles and passengers. To study the explosion morphology and impacting effects of shallow-buried explosives (TNT), a novel set of test facility was proposed in this study and used to perform shallow-buried sand explosion tests. By changing the type of sand and the buried depth of the explosives, the propagation of shock wave, the ejection trajectory of explosion products and sand, the deformation morphology of target plate, and the spatial distribution of explosion load were systematically investigated. It was demonstrated that shallow-buried sand explosion generated a shock wave in air, with a propagation velocity significantly greater than the ejection velocity of explosion products and sand. Upon detonation, the explosion products and sand were rapidly ejected outwards with continuously increasing volume, and spread around after hitting the target plate. The impulse generated by shallow-buried sand explosion was non-uniformly distributed in space, largest in the central explosion area and gradually decreasing outwards. The buried depth of explosives in sand affected the relative position of explosive products and sand when they were ejected. When the buried depth was relatively small, the explosive products would break through the covered sand layer and directly act on the target plate. When the buried depth was sufficiently large, the explosive products were essentially covered by a sand layer, which acted on the target plate together at a delayed instant. The type of sand used significantly affected the deformation morphology of the target plate. The sand purposely prepared in accordance with the NATO standard AEP-55 not only caused overall bending deformation of the target plate, but also formed a large number of pits on the target plate, thus generating a penetration effect. In contrast, the ordinary river sand only caused overall bending deformation of the target plate, with little penetration effect observed. The results obtained in this study are helpful for designing more effective protective structures against intense blast impacting from shallow-buried explosives.