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  • Hesselberg Norup posted an update 2 days, 12 hours ago

    Our successful demonstration of continuous control of the molecular recognition ability in the FETs by applying the mSAM system could lead to the development of next-generation versatile analyzers, including chemical sensor arrays for the determination of multiple analytes anytime, anywhere.Flexible perovskite solar cells (PSCs) have attracted significant interest as promising candidates for portable and wearable devices. Copper nanowires (CuNWs) are promising candidates for transparent conductive electrodes for flexible PSCs because of their excellent conductivity, flexibility, and cost-effectiveness. However, because of the thermal/chemical instability of CuNWs, they require a protective layer for application in PSCs. Previous PSCs with CuNW-based electrodes generally exhibited poor performances compared with their indium tin oxide-based counterparts because of the neglect of the interfacial energetics between the electron transport layer (ETL) and CuNWs. Herein, an Al-doped ZnO (AZO) protective layer fabricated using atomic layer deposition is introduced. The AZO/CuNW-based composite electrode exhibits improved thermal/chemical stability and favorable band alignment between the ETL and CuNWs, based on the Al dopant concentration tuning. As a result, the Al content gradient AZO (g-AZO), composed of three successively deposited AZO layers, leads to highly efficient flexible PSCs with a power conversion efficiency (PCE) of 14.18%, whereas the PCE of PSCs with a non-g-AZO layer is 12.34%. This improvement can be attributed to the efficient electron extraction and reduced charge recombination. Furthermore, flexible PSCs based on g-AZO-based composite electrodes retain their initial PCE, even after 600 bending cycles, demonstrating excellent mechanical stability.Poor interface stability is a crucial problem hindering the electrochemical performance of solid-state lithium batteries. In this work, a novel approach for interface stability was proposed to integrate the cathode/solid electrolyte by forming an electrolyte buffer layer on the rough surface of the cathode and coating a layer of graphite on the side of the electrolyte facing the lithium anode. This hybrid structure significantly improves the integration and the interface stability of the electrode/electrolyte. The interfacial resistance was dramatically reduced, the stability of the plating/stripping of Li metal was enhanced, and the growth of lithium dendrites was also inhibited due to the formation of the LiC6 transition layer. The obtained solid-state lithium battery shows enhanced rate performance at room temperature from 0.5 to 4 C and stable cycling performance at 1 C with a retention capacity of 100 mAh g-1 after 200 cycles. This integrated electrode/electrolyte design approach is expected to be widely used to improve interfacial stability and room-temperature electrochemical performance of solid-state batteries.Construction of large-scale single-layer two-dimensional (2D) frameworks in water is significant due to their utilities in various fields. Utilizing macrocycle-mediated supramolecular self-assembly represents a promising approach; however, challenges still remain in their practical preparation. Here, we exploited a two-step supramolecular strategy to build 2D organic-inorganic hybrid frameworks at a micrometer scale in water. Taking advantage of the high binding affinity to cucurbit[7]uril (CB[7]), mono-quaternary ammonium tetraphenylethene (MQATPE) derivatives were first included with CB[7] to form a 11 complex (MQATPE@CB[7]). Then, just mixing the complex with anionic polyoxometalate Na9[EuW10O36]·32H2O (denoted as Eu-POM) in a 31 molar ratio leads to the formation of single-layer 2D films with tens of micrometers via electrostatic and π-π stacking interactions. The most unique feature of this strategy is that the steric effect imposed by CB[7] would not only lead the modules to adopt a periodic hexagonal assembly but also forbid stacking between layers through comparison with the merely multilayered 2D nanosheets self-assembled by MQATPE/Eu-POM. Interestingly, the charge interactions between MQATPE and Eu-POM would lead to the aggregation-induced emission (AIE) fluorescence of MQATPE, and white light emission could be obtained through the simple regulation of the contents of Eu-POM and MQATPE. Furthermore, due to the high surface areas and more accessible active sites, the single-layer films can act as an effective enzyme inhibitor to modulate the activity of α-chymotrypsin (ChT). These findings suggest a simple but universal approach for single-layer hybrid materials, which may hold promise for practical applications in photophysical and biomedical fields.in English, French L’aspirine à faible dose en prévention primaire des maladies cardiovasculaires (CV) ne fait pas l’unanimité. De nouvelles études parues en 2018 mettent en évidence un rapport risques/bénéfices défavorable avec une augmentation des hémorragies majeures sans effets sur la survenue d’événements CV non mortels. Ces études soulignent également que les calculateurs actuels du risque CV surévaluent celui-ci, et ceci est probablement lié à l’amélioration depuis quelques décennies de la prise en charge des facteurs de risque CV. En accord avec les recommandations européennes de prévention CV, la prescription d’aspirine n’est donc plus recommandée aux adultes sans maladie CV manifeste.in English, French L’hypothyroïdie infraclinique est une entité fréquente et les bénéfices d’un traitement de substitution hormonal sont peu clairs. Les diverses guidelines recommandent actuellement de traiter les adultes symptomatiques ou avec des niveaux de thyrotropine (TSH) > 10 mUI/l. Les études observationnelles montrent en effet une association entre le taux de TSH et le risque cardiovasculaire. Cependant, selon les nouvelles données (large étude randomisée, revue systématique incluant 21 études), le traitement de l’hypothyroïdie infraclinique chez l’adulte n’a pas démontré de bénéfice symptomatique ni pronostique. Un panel d’experts internationaux indépendants, incluant médecins, épidémiologistes et patients, s’est donc prononcé en défaveur d’un traitement hormonal de ­l’hypothyroïdie infraclinique chez l’adulte. selleckchem Cette recommandation ne s’applique pas aux femmes enceintes ou essayant de concevoir, ainsi qu’aux patients avec des niveaux de TSH > 20 mUI/l.

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