查看更多>>摘要：A two-step chemical etching method for preparing superhydrophobic surfaces on stainless steel substrates is proposed. The stainless steel substrates were sequentially immersed in hydrochloric acid and ferric chloride solutions to create micro-nano structures, and then the surfaces were modified with low surface energy substances. Superhydrophobic surfaces with a contact angle of 159 degrees and a sliding angle of 2 degrees were prepared by varying the etching solution parameters. The fabricated superhydrophobic surfaces showed excellent stability and self-cleaning properties. This paper illustrates a low-cost and efficient chemical etching method that can be used for large-area surface fabrication.
查看更多>>摘要：Based on first-principles calculation, we investigated the photoelectric properties of Al0.5Ga0.5N nanowire with different diameters (3.7 angstrom, 7.5 angstrom, 9.3 angstrom). As calculated, Al0.5Ga0.5N nanostructure with 9.3 angstrom is the most stable (E-form = -2.43 eV) and has the smallest work function (phi = 6.20 eV). With the increase of diameter, the band gap (E-g) gradually decreases (from 6.569 eV to 5.427 eV). Meanwhile, the surface work function decreases linearly, indicating that photons are more easier to escape. What's more, the peak values of the basic optical properties all increase and move toward the higher-energy direction.
查看更多>>摘要：The aim of the paper is to make a summary of INRiM's most recent results on the alpha -beta solid-to-solid transition (s.s.t.), by reporting the basic details of the findings concerning what looks like a new, and apparently distinct, transition just below the "regular " alpha -beta one. Data are also reported for the temperature changes of the same transitions when measuring certified mixtures of argon in oxygen up to an argon amount concentration x(Ar) = 10(-3). The existence of a possible split into two alpha -beta transitions was theoretically predicted by Borovik-Romanov et al. and Kanda et al..
Freiberger, Eva MarieSteinrueck, Hans-PeterPapp, ChristianDuell, Fabian...
6页
查看更多>>摘要：The adsorption and thermal evolution of ethylene on Rh(1 1 1) were investigated by state-of-the-art surface science techniques. Synchrotron radiation-based high-resolution X-ray photoelectron spectroscopy (XPS) and temperature-programmed XPS allowed for the examination of the adsorption process and the reaction pathway of ethylene on Rh(1 1 1). At 140 K, ethylene adsorbs molecularly in a symmetrical geometry. The reaction intermediates formed upon heating were identified by the vibrational fine structure of XPS. At approximately 200 K, ethylidyne emerges, as expected from literature. Above 350 K, we observe the evolution of methylidyne. Simultaneously, decomposition to carbides sets in, which is completed at ~ 460 K.
查看更多>>摘要：HC/BiOBr/Bi12TiO20 microspheres with good photocatalytic activity were prepared by solvothermal method. The composition and morphology of HC/BiOBr/Bi12TiO20 & nbsp;were characterized by XRD, EDS, HRTEM and SEM. After irradiation with 7 W LED lamp for 160 min, the degradation efficiency of composite for rhodamine B, methyl blue, methyl orange was 98.55%, 30.74% and 16.67%, respectively. The degradation efficiency of 70 W metal halide lamps and natural light was better than that of LED lamps. HC/BiOBr/Bi12TiO20 has good reusability, strong photocatalytic activity and degree of mineralization, which is mainly attributed to its large specific surface area and high separation ability of photoinduced carriers.
Tseplin, Evgeniy E. E.Tseplina, Svetlana N. N.Lukin, Vladimir G. G.Khvostenko, Olga G. G....
5页
查看更多>>摘要：It was found that when the hyperthermal anions Br-, S- and SH-& nbsp;interact with the cleaned surface of soot, the intensity of the ion yield curves (IYC) of fragmentary anions S-& nbsp;and SH-& nbsp;decreases, while Br- does not. Based on the DFT calculations and the use of the induced charge model, it was shown that HOMO of the S-& nbsp;and SH-& nbsp;anions is located in the energy range of the conduction band of graphite, which allows an additional electron to tunnel from these anions to the surface and this leads to their neutralization.
查看更多>>摘要：Based on density functional theory and time-dependent density functional theory, the excited state charge distribution characteristics and fluorescence mechanism of fluorescence probe Q-1 and Q-CN have been discussed. The twisting potential energy curve proves that the diethylamine group in Q-CN will be twisted in S1 state. The frontier molecular orbitals proves that Q-CN has a small degree of charge coupling and the oscillator intensity is close to zero, so it is not conducive to luminescence. The results of "hole-electron" analysis prove that the quenching of Q-CN fluorescence is caused by the delocalization of the charge in S1 state.
查看更多>>摘要：In modern era, thermo-migration of microorganisms is an appealing research topic in bio-nanotechnology, bio engineering, and biomedical. In this context, a mathematical model describing thermo-bioconvection of Sutterby nanofluid flow including motile gyrotactic microorganisms near a perforated Riga plate under the physical impacts of heat radiation, and Arrhenius kinetics associated with binary chemical reaction is formulated and simulated here. The Darcy-Forchheimer (DF) law is applied to determine the porosity of porous media. The Grinberg term is taken for the Lorentz force owing to the parallel Riga plate wall. Appropriate translations are discharged to turn the constitutive partial differential equations (PDEs) into ordinary differential equations (ODEs), that are numerically computed by opting the Runge-Kutta-Fehlberg method (RKF-45) along with shooting strategy. The physical insights of various controlling variables on the transport profiles, Sherwood number, Nusselt number, and microorganisms density number are exemplified through requisite graphs and tables. It must be admitted that with enlarging Darcy number, the nanofluid velocity declines, while Forchheimer number has opposite consequence on it. The motile microorganisms density sharply decreases for improving values of activation parameter. The present modeling would provide preliminary guidances in a variety of biotechnological and industrial applications.
NSTL
Elsevier