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#32455183 2020/05/07 To Up
Cobalt Colloid-derived Efficient and Durable Nanoscale Electrocatalytic Films for High-Activity Water Oxidation.Oxygen evolution reaction is of immense importance and is vitally necessary for devices such as electrolyzers, fuel cells, and other solar and chemical energy conversion devices. The major challenges that remain in this quest are due to the lack of effective catalytic assemblages operating with optimum efficiency and obtainable following much simpler setups and easily accessible methods. Here, we demonstrate that the robust electrocatalytic activity toward water oxidation can be achieved employing straightforwardly obtainable nanoscale electrocatalysts derived from easily made colloidal-cobalt nanoparticles (Co-CNPs) prepared in clean carbonate systems. Thin-film non-noble metal nanoscale electrocatalysts such as simple Co-CNPs/FTO and annealed Co-CNPs/FTO and Co-CNPs/FTO obtained by depositing Co-CNPs on the FTO substrate are shown to initiate water oxidation at much lower overpotentials such as just 240 mV for Co-CNPs/FTO under mildly alkaline conditions while demonstrating an impressive Tafel slope of just 40 mV dec. Furthermore, the robust catalyst demonstrated a high electrochemical surface area of 91 cm and high turnover frequency and mass activity of 0.26 s and 18.84 mA mg, respectively, just at 0.35 V, and superior durability during long-term electrolysis. These outstanding catalytic outcomes using easily prepared Co-CNPs/FTO-type catalytic systems are comparable and even better than other noble and non-noble metal-based nanoscale catalytic assemblages obtained by much difficult methods. Most advantageously, the colloidal route also offers the easiest approach of incorporating carbon contents in the catalytic layer, which can ultimately increase mechanical stability and mass transfer capability of the system.
Noor-Ul-Ain Babar, Khurram Saleem Joya
1998 related Products with: Cobalt Colloid-derived Efficient and Durable Nanoscale Electrocatalytic Films for High-Activity Water Oxidation.400Tests25 ml100 ml 96 Tests 100ug Lyophilized100μg192 samples100 assays1500 ml
#32455182 2020/05/07 To Up
Spray-Coated Thin-Film Ni-Oxide Nanoflakes as Single Electrocatalysts for Oxygen Evolution and Hydrogen Generation from Water Splitting.Electrochemical water splitting is a key process in many electrochemical energy conversion and storage phenomena. Simple synthesis methods to make highly porous and active nanostructured catalytic materials with large electroactive surface areas are very important to implement water-to-fuel conversion schemes. Herein, ultrafine, transparent thin-film nickel-oxide (NiO ) nanoflakes are facilely synthesized following a simple spray-coating method from a solution-phase precursor. The NiO nanoscale structures are grown on the FTO surface in the form of highly uniform smooth thin films. They are employed as promising bifunctional electrocatalysts for the overall water splitting process under alkaline conditions. During water oxidation catalysis, NiO -SC/FTO initiates the oxygen evolution reaction (OER) at an overpotential η of just 250 mV while generating current decade at just 300 mV and demonstrates well-balanced kinetics toward OER. 10 mA cm current density remains persistent for many hours of continuous electrolysis at just 1.53 V illustrating high robustness of the system. The catalyst also showed substantial activity and durability toward the hydrogen evolution reaction (HER) under the same electrochemical conditions. Tafel slopes of just 57 and 89 mV dec for OER and HER in 0.5 M aqueous KOH solution, respectively, showing high intrinsic kinetics for electrocatalysis. Having high electrochemical surface area and an optimum number of electrochemically active sites, these transparent NiO thin films can be advantageously combined with photoelectrochemical devices for light-driven water-to-fuel conversion systems.
Noor-Ul-Ain Babar, Khurram Saleem Joya
2057 related Products with: Spray-Coated Thin-Film Ni-Oxide Nanoflakes as Single Electrocatalysts for Oxygen Evolution and Hydrogen Generation from Water Splitting.2 x 96 assays2.5 mg1ml96 Samples100 tests100Tests1,000 tests1ml96 Samples50 assays
#32454734 2019/07/10 To Up
Formulation Design of Hydrocortisone Films for the Treatment of Aphthous Ulcers.Research and development in oral drug delivery has evolved to the changeover of solid dosage forms from tablets to oral films. These films offer an elegant route for systemic drug delivery, with an advantage for patients who are suffering from difficulty in swallowing larger oral dosage forms. Aphthous ulcers are the most common oral lesions and are round or oval, with a grayish yellow, crateriform base. For the treatment of aphthous ulcers various marketed product are available, such as vitamin B12 tablets, benzydamine hydrochloride mouthwash or spray, steroid lozenges, and local anesthetics. Hence hydrocortisone is selected as the drug of choice for the treatment of aphthous ulcers, exhibiting anti-inflammatory and immunosuppressant properties that inhibit the clinical manifestations. The main aim of the present study was to develop a hydrocortisone film in order to improve the therapeutic efficacy and bioavailability of hydrocortisone for the treatment of aphthous ulcers.
Mohammed Gulzar Ahmed, Sanjana Adinarayana
2835 related Products with: Formulation Design of Hydrocortisone Films for the Treatment of Aphthous Ulcers.5 G1500 MG25 µg1mg 100 G1 Kit/Unit50 ml100 tests25 μg
#32454465 2020/05/26 To Up
Synthesis of IrO2 decorated core-shell [email protected]2 microspheres for bio-interface application.An effective approach is demonstrated for the fabrication of IrO-decorated [email protected] polypyrrole ([email protected]; [email protected]) microspheres. The synthesis starts with the preparation of monodispersive PS microspheres in diameter of 490 nm by an emulsifier-free emulsion polymerization, followed by a copolymerization involving pyrrole and PyNHmonomers in a PS microsphere aqueous suspension to produce uniform [email protected] microspheres in diameter of 536 nm. The loading of 2 nm IrOnanoparticles on the [email protected] is readily adjusted by tuning the pH value of IrOcolloidal solution and [email protected] At pH 4, we successfully obtain IrO-decorated [email protected] via electrostatic attraction and hydrogen bonding simultaneously between the negatively-charged IrOnanoparticles and positively-charged [email protected] These IrO-decorated [email protected] exhibit a characteristic cyclic voltammetric profile, similar to that of IrO2 thin film. The charge storage capacity is 5.19 mA/cm, a value that is almost five times greater than that of [email protected] In addition, these IrO-decorated [email protected] reveal excellent cell viability and biocompatibility.
Tsung-Lin Hsieh, Pei-Sung Hung, Chuan-Jyun Wang, Kuang-Chih Tso, Han-Yi Wang, Chien-Tai Cheng, Yu-Che Lin, Ren-Jei Chung, Kung-Hwa Wei, Pu-Wei Wu, Po-Chun Chen
2734 related Products with: Synthesis of IrO2 decorated core-shell [email protected]2 microspheres for bio-interface application.100ul0.1ml (1mg/ml) 100ul 100ul100ug Lyophilized100ug Lyophilized 100ul 100ul 100ul 100ul 100ul100ug Lyophilized
#32454345 2020/05/05 To Up
A novel internal fixation method for open book injuries of the pubic symphysis- A biomechanical analysis.Pelvic fractures in adults are common injuries and account for up to 3.64% of all fractures. Usually, the treatment of open book injuries (Types B1.1 and B1.2 AO-Classification) is open reduction and plate stabilization using dynamic compression plates, with or without interlocking screws. These implants seem to enhance the outcome of such injuries, but also variety of complications occurs. To reduce complications and achieve appropriate reduction and stabilization, this study compared established stabilization techniques to a novel minimally invasive internal fixation method using an internal fixator system that is already being utilized for spinal fractures.
Tobias Fritz, Laura Mettelsiefen, Friedemann Strobel, Benedikt J Braun, Steven C Herath, Sascha J Hopp, Tina Histing, Tim Pohlemann, Antonius Pizanis
1722 related Products with: A novel internal fixation method for open book injuries of the pubic symphysis- A biomechanical analysis.100Tests100ug 1 G100 μg100 μg100 μg100 μg100 μg1 module100 μg100 μg100 μg
#32453955 2020/05/26 To Up
Significant Effect of Surfactant Adsorption Layer Thickness in Equilibrium Foam Films.Foam films formed at the air-water interface do not have fixed adsorption sites where adsorbed surfactants can arrange themselves, resulting in the formation of thick adsorption layers. Current theories of equilibrium foam films fail to account for this feature and significantly underestimate the adsorption layer thickness. Here we show that this thickness has a significant effect on the disjoining pressure in foam films. If ignored, the theory predicts unphysical electrostatic potential profiles, which underestimate the disjoining pressure. We apply a previously developed adsorption model that incorporates a realistic thickness for the adsorption layer. This new model reproduces experimental measurements of the disjoining pressure of foam films very well over a wide surfactant concentration range without fitting parameters. Our work shows that a thick adsorption layer leads to a shorter diffuse layer in the thin liquid film, which will increase the electrostatic potential inside the film and lead to higher disjoining pressure.
Mengsu Peng, Timothy T Duignan, Anh V Nguyen
1446 related Products with: Significant Effect of Surfactant Adsorption Layer Thickness in Equilibrium Foam Films.300 units100 μg100ug Lyophilized100 μg 5 G1 Set0.1 mg32-50 Sample Kit1 Set1 mg1 Set
#32453595 2020/05/26 To Up
Oxidative Spin-Spray Assembled Coordinative Multilayers as Platforms for Capacitive Films.Spin-spray assisted layer-by-layer (LbL) assembly technique was used to prepare coordinative oxidative multilayers from Ce(IV), inorganic polyphosphate (PP), and graphene oxide (GO). The films consist of successive tetralayers and have a general structure (PP/Ce/GO/Ce). Such oxidative multilayers have been shown to be a general platform for the electrodeless generation of conducting polymer and melanin-type films. Although the incorporation of GO enhances the film growth the conventional dip-LbL method is very time-consuming. We show that the spin-spray method reduces the time required to grow thick multilayers by the order of magnitude and the film growth is linear from the beginning, which implies a stratified structure. We have deposited poly(3,4-ethylenedioxothiophene), PEDOT, on the oxidative multilayers, and studied these redox active films as models for melanin-type capacitive layers for supercapacitors to be used in biodegradable electronics, both before and after the electrochemical reduction of GO to rGO. The amount of oxidant and PEDOT scale linearly with the film thickness and the charge transfer kinetics is not mass transfer limited, especially after the reduction of GO. The areal capacitance of the films grows linearly with the film thickness, reaching a value of ca. 1.6 mF cm with 20 tetralayers, and the specific volumetric (per film volume) and mass (per mass of PEDOT) capacitance is ca. 130 F cm and 65 F g, respectively. 5,6-Dihydroxyindole can also be polymerized to a redox active melanin-type film on these oxidative multilayers, with even higher areal capacitance values.
Mikko Oskari Salomäki, Lauri Johannes Marttila, Henri Kivelä, Matti Tupala, Jukka Olavi Lukkari
2943 related Products with: Oxidative Spin-Spray Assembled Coordinative Multilayers as Platforms for Capacitive Films.1100Tests100 tests100 assays1,000 tests96 Tests50 assays100200 assays100 assays
#32453577 2020/05/26 To Up
Potential-Modulated Total Internal Reflection Fluorescence for Measurement of Electron Transfer Kinetics of Submonolayers on Optically Transparent Electrodes.An electroreflectance method to determine the electron transfer rate constant of a film of redox-active chromophores immobilized on an optically transparent electrode when the surface coverage of the film is very low surface (< 0.1 monolayer) is described herein. The method, potential-modulated total internal reflection fluorescence (PM-TIRF) spectroscopy, is a fluorescence version of potential-modulated attenuated total reflection (PM-ATR) spectroscopy that is applicable when the immobilized chromophores are luminescent. The method was tested using perylene diimide (PDI) molecules functionalized with p-phenylene phosphonic acid (PA) moieties that bind strongly to indium-tin oxide (ITO). Conditions to prepare PDI-phenyl-PA films that exhibit absorbance and fluorescence spectra characteristic of monomeric (i.e., non-aggregated) molecules were identified; the electrochemical surface coverage was approximately 0.03 monolayer. The tilt angle of the long axis of the PDI molecular plane is 58˚ relative to the ITO surface normal, 25˚ greater than the tilt angle of aggregated PDI-phenyl-PA films, which have a surface coverage of approximately one monolayer. The more in-plane orientation of monomeric films is likely due to the absence of cofacial π-π interactions present in aggregated films, and possibly a difference in PA-ITO binding modes. The electron transfer rate constant (ks,opt) of monomeric PDI-phenyl-PA films was determined using PM-TIRF and compared with PM-ATR results obtained for aggregated films. For PDI monomers, ks,opt = 3.8x103 s-1, which is about 3.7-fold less than ks,opt for aggregated films. The slower kinetics are attributed to the absence of electron self-exchange between monomeric PDI molecules. Differences in the electroactivity of the binding sites on the ITO electrode surface also may play a role. This is the first demonstration of PM-TIRF for determining electron transfer rate constants at an electrode/organic film interface.
Yilong Zheng, Anthony Giordano, Seth R Marder, S Scott Saavedra
2048 related Products with: Potential-Modulated Total Internal Reflection Fluorescence for Measurement of Electron Transfer Kinetics of Submonolayers on Optically Transparent Electrodes.1 kit100 plates 5 G10 plates1 kit100 plates1 kit10 plates1 kit100 μg100 μg
#32453550 2020/05/26 To Up
Flexible, Transparent and Conductive Ti3C2Tx MXene-Silver Nanowire Films with Smart Acoustic Sensitivity for High-Performance Electromagnetic Interference Shielding.Although flexible, transparent and conductive materials are increasingly required for electromagnetic interference (EMI) shielding applications in foldable and wearable electronics, it remains a great challenge to achieve outstanding shielding performances while retaining high light transmittances. Herein, a multiscale structure optimization strategy is proposed to fabricate transparent and conductive silver nanowire (AgNW) film with both high EMI shielding performance and high light transmittance by a scalable spray-coating technique. By decorating a Ti3C2Tx MXene coating, the connection and integrity of the AgNW network are greatly improved by welding the nanowire junctions. Compared to neat AgNW film (21 dB) with the same AgNW density, the Ti3C2Tx MXene-welded AgNW film shows a much higher EMI shielding performance (34 dB) with better mechanical and environmental stabilities. Furthermore, the layered structure design on macroscopic scale results in an even higher EMI shielding efficiency of 49.2 dB with a high light transmittance of ~83%. With the Ti3C2Tx MXene coating and the PET substrate as a triboelectric pair, the layered structure offers great flexibility for the transparent film to integrate smart sound monitoring capability. Therefore, the combination of excellent EMI shielding performance, high light transmittance, and sensitive pressure response makes the Ti3C2Tx MXene-welded AgNW films promising for many potential applications in next-generation electronics.
Wei Chen, Liu-Xin Liu, Hao-Bin Zhang, Zhong-Zhen Yu
2930 related Products with: Flexible, Transparent and Conductive Ti3C2Tx MXene-Silver Nanowire Films with Smart Acoustic Sensitivity for High-Performance Electromagnetic Interference Shielding.96 wells (1 kit) 500 ml Kit96 wells (1 kit) 125 ml 96 wells (1 kit)96 wells (1 kit) 1000 ml 96 tests96 wells (1 kit)5x96 well plate
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