Nanomaterials in Catalysis, First Edition
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It should be mentioned that in some previous works it has been already reported that hybrid nanomaterials based on Ag NPs on different supports can be effective catalysts and antibacterial agents. Most of these hybrid nanomaterials have similar average sizes and specific surface areas of Ag NPs [5,10,12,14,40] , but the thermal stability of Ag based hybrid nanomaterials has not been studied before.
Nevertheless, the prime novelty of the present work is in the designing of advanced supports — petal-like BN nanoparticles. Utilization of these nanostructures opens up new opportunities to improve the performance of hybrid nanomaterials. Many techniques for surface modification  and band-gap engineering [41,42] were described in the past few years. All these properties have a significant influence on the catalytic and antibacterial performance of hybrid nanomaterials.
Structural studies revealed that the hybrid nanomaterials had consisted of numerous BN nanosheets self-organized in solid NPs with an average size of 50— nm and evenly covered with partially oxidized Ag NPs having diameters of 5—15 nm. The nanomaterials obtained via UV decomposition of AgNO 3 demonstrated much better catalytic activity compared with the hybrid nanomaterials fabricated via CVD because the major part of Ag NPs in the latter case was covered with the layers of h -BN, thereby reducing their catalytic activity.
Raw BN NPs were produced using a boron oxide CVD process from a mixture of FeO, MgO, and B powders a weight ratio via a reaction of boron oxide vapour and flowing ammonia in the vertical induction furnace, as described elsewhere . As a result, Ag vapors were simultaneously condensed along with the nucleation and growth of the BN NPs.
Next, the mixture was exposed to an UV lamp nm for 30 min during magnetic stirring, and then washed with distilled water and dried. The chemical composition of the sample surfaces was characterized by X-ray photoelectron spectroscopy XPS using an Axis Supra Kratos Analytical spectrometer.
The powder samples were attached to the carbon tape covered with glue. The maximum lateral dimension of the analyzed area was 0. To avoid differential charging of samples, the spectra were acquired with charge neutralization.
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The spectra were subsequently normalized by shifting the hydrocarbon component to Due to the carbon signal coming from the tape, all spectra exhibited a strong carbon signal. The oxygen peak was also enhanced due to the glue on the carbon tape surface. In order to compensate the oxygen coming from the tape, the C 1s spectrum was fitted and the calculated amounts of C O O and C —O arrangements were used to calculate the amount of oxygen related to the carbon tape. The samples were tested with respect to a methanol oxidation reaction in a fixed-bed continuous-flow reactor at the atmospheric pressure.
The concentration of methanol was 3.
Plasma Processing of Nanomaterials
The gas composition was analyzed by a ThermoStar mass-spectrometer Pfeiffer Vacuum. The conversion of methanol was calculated based on the intensity of the peak at 31 amu. For primary screening, we used the cap-plate method agar diffusion test. Then, 0.
Plasma Processing of Nanomaterials - CRC Press Book
Raw BN NPs 0. Three standard plastic coupons, mm 2 , were immersed into E. After the tests, the coupons were removed, rinsed with 10 mL of physiological solution, and finally sonicated for 2 min to remove bacterial cells from the surface of coupons. Then 60 mL of resulting suspension was selected and a number of CFUs was counted. Kaliappan Muthukumar, Harald O. Twitter: BeilsteinInst. Beilstein J. Toggle navigation.
Unfolding adsorption on metal nanoparticles: Connecting stability with catalysis
Golberg 2,5 and Dmitry V. Shtansky 1. Konstantin L. Denis V.
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Alexander E. Andrey M. Andrei T. Anton M. Irina V. Pavel V. Nadezda K. Sergey G. Dmitri V. Dmitry V. Results and Discussion. Jump to Figure 1. Jump to Figure 2. Jump to Figure 3. Jump to Figure 4. Jump to Figure 5. Jump to Figure 6. Jump to Figure 7. Jump to Figure 8. Jump to Figure 9. Supporting Information. Format: PDF Size: Nanoscale , 4, — A , 3, — C , , — Interfaces , 3, — A , 2, — A , 1, — Carbon , 54, — Acta , 67, — Meanwhile some natural enzymes which contains much less noble metals are also effective HER catalysts.
In order to figure out the active sites, a combination of surface sensitive methods and reactivity studies must be sophisticatedly designed. For sheets with different sizes, the exchange current densities are quite different, however it shows almost no relationship between basal sizes and activities, the reason is that the basal plane of MoS 2 has no catalytic activity. In both figures, open circles and filled circles are samples prepared under different conditions. The exchange current density does not correlate with the area coverage of MoS 2 , whereas it shows a linear dependence on the MoS 2 edge length.
Reproduced with permission. The insert is a fast Fourier transform FFT of the image and shows hexagonally arranged spots at the 0. Moreover, a hexagonal set of lattice distances at 0. It is well known that enzymes must adopt a specific configuration to achieve efficient catalytic performances, unravelling details of MoS 2 edge structures would gain our knowledge to better understand the reactions.
There are three basic and comprehensive rules to design more active HER catalysts 45 : increasing the activity of single active site, or increasing the amount of active sites, and the third rule is to increase the conductivity of catalyst. Another way is to design new catalyst with similar active center, since we already know that the active sites are edges and we already know their structures.