Donnellyhagan8486

The amorphous carbon in C/ZnO could promote optical absorption, improve conductivity and reduce the interfacial charge transport resistance. Ni-NiS improved the electron-hole-pair separation of the C/ZnO nanofibers. The observed enhancement in photocatalytic activity was largely attributed to higher light utilization and effective electron-hole separation. This work proves that Ni-NiS is a promising cocatalyst to ZnO for photocatalytic CO2 reduction.The syntheses of [RuVI(Por)(NAd)(O)] and [RuVI(2,6-F2-TPP)(NAd)2] have been described. [RuVI(2,6-F2-TPP)(NAd)(O)] capable of catalysing aerobic epoxidation of alkenes has been characterised by X-ray crystallography with Ru[double bond, length as m-dash]NAd and Ru[double bond, length as m-dash]O bond distances being 1.778(5) Å and 1.760(4) Å (∠O-Ru-NAd 174.37(19)°), respectively. Its first reduction potential is 740 mV cathodically shifted from that of [RuVI(2,6-F2-TPP)(O)2].It has been challenging to detect small analytes in both positive and negative ion modes using organic matrices in conventional matrix-assisted laser desorption/ionization mass spectrometry (MALDI-MS). Herein, TiO2 nanowires are presented as a solid matrix to form dual ions of analytes regardless of their chemical properties and to demonstrate versatile applicability in LDI-MS.AgO nanoparticles were successfully integrated into NiCo2O4 nanosheets for enhanced electrochemical catalysis ability and stability in the oxygen evolution reaction (OER). The chrysanthemum-like NiCo2O4/AgO composites mounted on nickel foam (NF) were synthesized by a hydrothermal-calcination method. AgO upgraded the ratio of Co3+/Co2+ and thus regulated the intrinsic activity of the species. The highly hierarchical structure of NiCo2O4/AgO composed of 0D AgO nanoparticles, 1D NiCo2O4 needles, 2D NiCo2O4 nanosheets, and 3D chrysanthemum-like bundles grown on NF bestowed the high surface area and mesoporous structure for the easy evolution of O2. The Ni atoms in NiCo2O4 originating in situ from NF in the process of AgO formation produced an integrated electrode of the active component of NiCo2O4 bound on NF with a superb highway for charge transfer. AgO significantly tuned the structure and physicochemical properties of NiCo2O4. As a result, NiCo2O4/AgO/NF exhibited excellent OER performance with an overpotential of 232 mV to obtain a current density of 10 mAcm-2 in an alkaline electrolyte, and the catalyst showed a small loss of the initial catalyst activity for 50 h and over 5000 cycles. This study provides a pathway for developing high-performance OER electrocatalysts.We report a joint negative ion photoelectron spectroscopy (NIPES) and computational study on the electronic structures and noncovalent interactions of a series of cyclodextrin-closo-dodecaborate dianion complexes, χ-CD·B12X122- (χ = α, β, γ; X = H, F). The measured vertical/adiabatic detachment energies (VDEs/ADEs) are 1.15/0.93, 3.55/3.20, 3.90/3.60, and 3.85/3.60 eV for B12H122- and its α-, β-, γ-CD complexes, respectively; while the corresponding values are 1.90/1.70, 4.00/3.60, 4.33/3.95, and 4.30/3.85 eV for the X = F case. These results show that the inclusion of B12X122- into the CD cavities greatly increases the electronic stability of the dianions. The effect of electronic stabilization for β-CD is roughly the same as for γ-CD, both being considerably stronger than that for α-CD. Density functional theory (DFT) based geometry optimization reveals that B12X122- are inserted into CDs increasingly deeper from α-CD to γ-CD. find more The calculated VDEs and ADEs agree with the experiments well, particularly, reproboth size (α-, β-, and γ-) and molecular (X = H or F) specificities, thus providing critical molecular-level information on the cyclodextrin-closo-dodecaborate interactions of interest to medical applications, e.g., boron neutron capture therapy.This manuscript reports supramolecular copolymerization of amphiphilic donor (D) and acceptor (A) units and their antibacterial activity. The donor unit (Py-1) contains a pyrene chromophore attached to a quaternary ammonium group by an amide linker. In the acceptor unit (NDI-1), a naphthalene-diimide (NDI) chromophore is attached to a hydrophilic non-ionic wedge and a benzamide group on its two opposite arms. In aqueous medium, Py-1 and NDI-1 produce micelle like nanoparticles and a fibrillar gel, respectively. Contrastingly, their 1  1 mixture shows polymersome like assembly in which the membrane is constituted of alternating D-A stacking stabilized by charge-transfer (CT) interactions and H-bonding among the amide groups. H-Bonding further gives unidirectional lateral orientation of the two chromophores and also regulates the direction of curvature so that all the cationic head groups are displayed on the exofacial polymersome surface. Such cationic D-A supramolecular polymersomes exhibit good bactericidal the mammalian cell membrane.Interactions of proteins with functional groups are key to their biological functions, making it essential that they be accurately modeled. To investigate the impact of the inclusion of explicit treatment of electronic polarizability in force fields on protein-functional group interactions, the additive CHARMM and Drude polarizable force field are compared in the context of the Site-Identification by Ligand Competitive Saturation (SILCS) simulation methodology from which functional group interaction patterns with five proteins for which experimental binding affinities of multiple ligands are available, were obtained. The explicit treatment of polarizability produces significant differences in the functional group interactions in the ligand binding sites including overall enhanced binding of functional groups to the proteins. This is associated with variations of the dipole moments of solutes representative of functional groups in the binding sites relative to aqueous solution with higher dipole moments systemns.We uncover the existence of several competitive mechanisms of water oxidation on the β-CoOOH (10-14) surface by going beyond the classical 4-step mechanism frequently used to study this reaction at the DFT level. Our results demonstrate the importance of two-site reactivity and of purely chemical steps with the associated activation energies. Taking the electrochemical potential explicitly into account leads to modifications of the reaction energy profiles finally leading to the proposition of a new family of mechanisms involving tetraoxidane intermediates. The two-site mechanisms revealed in this work are of key importance to rationalize and predict the impact of dopants in the design of future catalysts.We use fac-[Re(bpy)(CO)3Cl] ([Re-Cl]) dispersed in polymer ion gel (PIG) ([Re]-PIG) to carry out electrocatalytic CO2 reduction in water. Electrolysis at -0.68 V vs. RHE in a CO2-saturated KOH and K2CO3 solution produces CO with over 90% Faradaic efficiency. The PIG electrode is readily combined with water oxidation catalysts to generate a full electrochemical cell. Additionally, we provide evidence that the PIG electrode can be implemented with other molecular catalysts.Ion conduction through graphene oxide (GO) nanosheets that is pH-switchable between H+ (in acid) and OH- (in base) ions is demonstrated. This finding is the first observation of this type for ion conductive materials and demonstrates an example of stimuli-driven ion-conduction switching.As a dihydrochalcone, phloretin was reported to effectively attenuate palmitic acid (PA)-induced oxidative stress in endothelial cells. In the present study, we further investigated the antioxidant capacity of phloretin via restoring the activity of MnSOD through deacetylation in vitro and in vivo. The results revealed that phloretin (50 μM) treatment significantly increased the activity of MnSOD in the HUVECs and mouse aortas, and then obviously reduced the accumulation of mitochondrial ROS. Immunoprecipitation assay and Western blot analysis indicated that phloretin could decrease the lysine acetylation of MnSOD and restore its activity by promoting the expression of Sirt3 by increasing the phosphorylation of AMPK (Thr172). These findings provide a novel profile to explain the antioxidant activity of phloretin by reducing the acetylation level of MnSOD via an AMPK/Sirt3 signaling pathway.Toehold-mediated strand displacement (TMSD) as an important player in DNA nanotechnology has been widely utilized for engineering non-enzymatic molecular circuits. However, these circuits suffer from uncontrollable leakage and unsatisfactory response speed. We utilized site-specific and sequence-independent nucleases to engineer high- robustness DNA molecular circuits. First, we found that the kinetics of the APE1-catalyzed reaction is highly dependent on substrate stability, allowing for the elimination of asymptotic leakage of DNA split circuits. link2 Second, we obtained strict substrate preference of λ exonuclease (λexo) by optimizing the reaction conditions. Robust single-layer and cascade gates with leak resistance were established by using λ exo. Owing to the remarkably fast kinetics of these nucleases, all the circuits yield a high speed of computation. Compared to TMSD-based approaches, nuclease-powered circuits render advanced features such as leakage resistance, hundreds of times higher speed, and simplified structures, representing a class of promising artificial molecule systems.Propanedioyl dihydrazide (PDH), traditionally believed to be non-fluorescent, was first discovered to emit substantial fluorescence in both the solid state and solvents. Then, significantly, a novel strategy is provided fluorescent non-aromatic small molecules with rigid molecular structures could be constructed by forming hydrogen bonds.Shortage of water resources and deterioration of water quality are becoming more and more serious today. link3 Inspired by Namib Desert beetles, scientists designed biomimetic fog collection materials to obtain fresh water. The overview of this field is limited and mainly concerned with the preparation and application. In this paper, we focused on the water collection efficiency of surfaces inspired by beetles and discussed their influence on the water collection efficiency from three aspects surface wettability, surface structure and surface pattern distribution.In this work, a sensitive and selective electrochemiluminescent aptasensor was proposed based on the enhancing mechanism of the metal-organic framework NH2-MIL-125(Ti) in a 3,4,9,10-perylenetetracarboxylic acid/K2S2O8 system for a diethylstilbestrol assay. Herein, 3,4,9,10-perylenetetracarboxylic acid was selected as the major luminophore, and the metal-organic framework NH2-MIL-125(Ti) displayed a large specific surface area to immobilize abundant PTCA molecules to facilitate electrochemiluminescence efficiency. Besides, the metal-organic framework NH2-MIL-125(Ti) was used as a novel catalyst in the 3,4,9,10-perylenetetracarboxylic acid/K2S2O8 system, which could react with the co-reactant K2S2O8 to produce more SO4˙-. In addition, we introduced the amino-aptamer of diethylstilbestrol; due to the specific binding affinity between the aptamer and diethylstilbestrol, a selective electrochemiluminescent aptasensor for diethylstilbestrol was thus developed here. Under the optimal conditions, a wide detection range from 1.