Public attention, big data technology, and green innovation efficiency: empirical analysis based on spatial metrology

This study employs the undesirable output super-efficiency SBM-DEA model to reassess the green innovation efficiency (GIE) of 30 Chinese provinces from 2011 to 2020. We pioneer the examination of public attention (PA) influence on GIE and spatial spillover effects, employing the spatial Durbin model. Additionally, a spatial mediation model, incorporating big data technology as a mediator, is adopted. Key findings are as follows: 1) Significant spatial correlations exist in PA and GIE. 2) Improved PA in one province can help enhance the GIE in neighboring provinces but cannot directly impact the local GIE. 3) The positive impact of PA on local GIE follows an indirect path. Specifically, PA elevates the level of big data technology in the local and neighboring provinces, and this positive technological spillover effect significantly enhances the GIE across the entire region. 4) Industrial structure and research and development intensity also influence GIE to some extent.</p

SU-8-Induced Strong Bonding of Polymer Ligands to Flexible Substrates via in Situ Cross-Linked Reaction for Improved Surface Metallization and Fast Fabrication of High-Quality Flexible Circuits

On account of in situ cross-linked reaction of epoxy SU-8 with poly­(4-vinylpyridine) (P4VP) and its strong reactive bonding ability with different pretreated substrates, we developed a simple universal one-step solution-based coating method for fast surface modification of various objects. Through this method, a layer of P4VP molecules with controllable thickness can be tethered tightly onto substrates with the assistance of SU-8. P4VP molecules possess a lot of pyridine ligands to immobilize transitional metal ions that can behave as the catalyst of electroless copper plating for surface metallization while functioning as the adhesion-promoting layer between the substrate and deposited metal. Attributed to interpenetrated entanglement of P4VP molecules and as-deposited metal, ultrathick (>7 μm) strongly adhesive high-quality copper layer can be formed on flexible substrates without any delamination. Then through laser printer to print toner mask, a variety of designed circuits can be easily fabricated on modified flexible PET substrate

Relationship between plasma trans-fatty acid isomer concentrations and self-reported cardiovascular disease risk in US adults

<p>The effect of different individual TFA isomers on cardiovascular disease (CVD) has been a limited study, especially for stroke. We aimed to investigate the relationships between four major plasma TFA isomer (elaidic, vaccenic, palmitelaidic and linolelaidic acid) concentrations and the risk of CVD, stroke and non-stroke CVD. A cross-sectional study was conducted, utilising a nationally representative sample of US adults in the National Health and Nutrition Examination Survey. Among the 3504 participants, 304 participants self-reported CVD history. The highest quintile of elaidic acid intake was associated with a 233% higher CVD risk (<i>p</i> = .010). Adjusted for age, gender and race, palmitelaidic acid was associated with a decreased CVD risk, but the effect size was diminished in a subsequent analysis model. For stroke risk, we failed to identify any associations. In addition to elaidic acid, the health effect of palmitelaidic acid should be paid more attention in the future studies.</p

Direct Pen Writing of Adhesive Particle-Free Ultrahigh Silver Salt-Loaded Composite Ink for Stretchable Circuits

In this article, we describe a writable particle-free ink for fast fabrication of highly conductive stretchable circuits. The composite ink mainly consists of soluble silver salt and adhesive rubber. Low toxic ketone was employed as the main solvent. Attributed to ultrahigh solubility of silver salt in short-chain ketone and salt-assisted dissolution of rubber, the ink can be prepared into particle-free transparent solution. As-prepared ink has a good chemical stability and can be directly filled into ballpoint pens and use to write on different substrates to form well adhesive silver salt-based composite written traces as needed. As a result of high silver salt loading, the trace can be converted into highly conductive silver nanoparticle-based composites after <i>in situ</i> reduction. Because of the introduction of adhesive elastomeric rubber, the as-formed conductive composite written trace can not only maintain good adhesion to various substrates but also show good conductivity under various deformations. The conductivity of written traces can be enhanced by repeated writing-reduction cycles. Different patterns can be fabricated by either direct handwriting or hand-copying. As proof-of-concept demonstrations, a typical handwriting heart-like circuit was fabricated to show its capability to work under different deformations, and a pressure-sensitive switch was also manufactured to present pressure-dependent change of resistance

Solvothermal Synthesis of Monodisperse LiFePO₄ Micro Hollow Spheres as High Performance Cathode Material for Lithium Ion Batteries

A microspherical, hollow LiFePO₄ (LFP) cathode material with polycrystal structure was simply synthesized by a solvothermal method using spherical Li₃PO₄ as the self-sacrificed template and FeCl₂·4H₂O as the Fe²⁺ source. Scanning electron microscopy (SEM) and transmission electron microscopy (TEM) show that the LFP micro hollow spheres have a quite uniform size of ∼1 μm consisting of aggregated nanoparticles. The influences of solvent and Fe²⁺ source on the phase and morphology of the final product were chiefly investigated, and a direct ion exchange reaction between spherical Li₃PO₄ templates and Fe²⁺ ions was firstly proposed on the basis of the X-ray powder diffraction (XRD) transformation of the products. The LFP nanoparticles in the micro hollow spheres could finely coat a uniform carbon layer ∼3.5 nm by a glucose solution impregnating–drying–sintering process. The electrochemical measurements show that the carbon coated LFP materials could exhibit high charge–discharge capacities of 158, 144, 125, 101, and even 72 mAh g^–1 at 0.1, 1, 5, 20, and 50 C, respectively. It could also maintain 80% of the initial discharge capacity after cycling for 2000 times at 20 C

Data_Sheet_1_Application of 3D Printed Porous Copper Anode in Microbial Fuel Cells.docx

<p>In this study, 3D printing technique was utilized to fabricate three-dimensional porous electrodes for microbial fuel cells with UV curable resin, followed by copper electroless plating. A maximum voltage of 62.9 ± 2.5 mV and a power density of 6.45 ± 0.5 mWm⁻² were achieved for MFCs with 3D printed porous copper (3D-PPC) anodes, which were 8.3- and 12.3-fold higher than copper mesh electrodes, respectively. This illustrated the great advantage of 3D porous anodes in MFCs compared to flat anode structures. Besides, the biocompatibility of the copper anode with Shewanella oneidensis MR-1 was examined by comparing with carbon cloth, which produced a 3-fold larger maximum voltage and a ~10-fold higher power density vs. 3D-PPC anodes and thus indicated the possible copper corrosion during MFC operation. ICP-MS analysis of MFC solution revealed the high concentration of 732 ± 27.1 μg/L copper ions detected in the MFC effluent. This result, coupled with EDX showing the lower copper content on the 3D-PPC anode surface after >15 days of MFC operation, confirmed the copper dissolving behavior in MFC. MR-1 biofilm formation under copper suppression was finally characterized by SEM and less biofilm was observed on copper anodes, illustrating their poor biocompatibility, even though 3D printing technology and porous structures were quite promising for future scale-up.</p

Flexible Transparent PES/Silver Nanowires/PET Sandwich-Structured Film for High-Efficiency Electromagnetic Interference Shielding

We have developed a kind of high-yield synthesis strategy for silver nanowires by a two-step injection polyol method. Silver nanowires and polyethylene oxide (PEO) (<i>M</i>_w = 900 000) were prepared in a homogeneous-coating ink. Wet composite films with different thicknesses were fabricated on a PET substrate by drawn-down rod-coating technology. Silver nanowires on PET substrates present a homogeneous distribution under the assistance of PEO. Then PEO was thermally removed in situ at a relatively low temperature attributed to its special thermal behavior under atmospheric conditions. As-prepared metallic nanowire films on PET substrates show excellent stability and a good combination of conductivity and light transmission. A layer of transparent poly­(ethersulfones) (PESs) was further coated on silver nanowire networks by the same coating method to prevent the shedding and corrosion of silver nanowires. Sandwich-structured flexible transparent films were obtained and displayed excellent electromagnetic interference (EMI) shielding effectiveness