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41.
In this study, we introduce a simple and effective seed‐mediated growth method (SMGM) for the controlled synthesis of boron suboxide powder. By employing starting powders with different concentrations and adding boron suboxide seeds with a star‐like morphology, we demonstrate that B6O ceramics that exhibit high‐level crystallinity can be synthesized using SMGM at ambient pressure conditions. The formation of multilayered star‐shaped B6O particles via SMGM is reported for the first time. 相似文献
42.
43.
High Broad‐Band Photoresponsivity of Mechanically Formed InSe–Graphene van der Waals Heterostructures 下载免费PDF全文
44.
Relevance of the acid–base approach in prediction of adhesion properties in two‐component injection moulding 下载免费PDF全文
Eduard Kraus Sonja Horvat Christian Deubel Christian Staudigel Benjamin Baudrit Peter Heidemeyer Martin Bastian Irina Starostina Oleg Stoyanov 《应用聚合物科学杂志》2016,133(8)
We demonstrate the use of innovative wetting method in prediction of the adhesion properties of biobased polymers for two‐component injection moulding, taking into account the acid–base surface properties of joined materials. The measurements were carried out in accordance with modified Berger method by calculation of the difference in shortened acidity parameter ΔDshort between hard and soft component. Correlation factors up to 0.99 were observed between ΔDshort and peel force. In comparison to results obtained by conventional wetting methods, high potential for the selection of components with high interface adhesion and for prediction of the functionality by the acid–base approach was demonstrated. © 2015 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133, 43048. 相似文献
45.
This paper studies the effect of the zone tax offset (ZTO), a place based income subsidy implemented in rural Australia since 1945. The policy was intended to improve the welfare of inhabitants and provide an incentive for settlement. Our empirical approach exploits the geographical discontinuity in the eligibility for the subsidy to identify its causal effect on population growth. Using data on population by locality from the historical censuses we find that the ZTO had a positive but only temporary effect on population growth in the targeted areas. 相似文献
46.
Vladimir S. Derevschikov Janna V. Veselovskaya Anton S. Shalygin Dmitry A. Yatsenko Andrey Z. Sheshkovas Oleg N. Martyanov 《中国化学工程学报》2022,46(6):11-20
Potassium carbonate-based sorbents are prospective materials for direct air capture (DAC). In the present study, we examined and revealed the influence of the temperature swing adsorption (TSA) cycle conditions on the CO2 sorption properties of a novel aerogel-based K2CO3/ZrO2 sorbent in a DAC process. It was shown that the humidity and temperature drastically affect the sorption dynamic and sorption capacity of the sorbent. When a temperature at the sorption stage was 29 ℃ and a water vapor pressure in the feed air was 5.2 mbar (1 bar = 105 Pa), the composite material demonstrated a stable CO2 sorption capacity of 3.4% (mass). An increase in sorption temperature leads to a continuous decrease in the CO2 absorption capacity reaching a value of 0.7% (mass) at T = 80 ℃. The material showed the retention of a stable CO2 sorption capacity for many cycles at each temperature in the range. Increasing PH2O in the inlet air from 5.2 to 6.8 mbar leads to instability of CO2 sorption capacity which decreases in the course of 3 consecutive TSA cycles from 1.7% to 0.8% (mass) at T = 29 ℃. A further increase in air humidity only facilitates the deterioration of the CO2 sorption capacity of the material. A possible explanation for this phenomenon could be the filling of the porous system of the sorbent with solid reaction products and an aqueous solution of potassium salts, which leads to a significant slowdown in the CO2 diffusion in the composite sorbent grain. To investigate the regeneration step of the TSA cycle in situ, the macro ATR-FTIR (attenuated total reflection Fourier-transform infrared) spectroscopic imaging was applied for the first time. It was shown that the migration of carbonate-containing species over the surface of sorbent occurs during the thermal regeneration stage of the TSA cycle. The movement of the active component in the porous matrix of the sorbent can affect the sorption characteristics of the composite material. The revealed features make it possible to formulate the requirements and limitations that need to be taken into account for the practical implementation of the DAC process using the K2CO3/ZrO2 composite sorbent. 相似文献
47.
Oleg A. Kazantsev Dmitry V. Orekhov Denis M. Kamorin Maria V. Savinova 《Designed Monomers and Polymers》2017,20(1):136-143
Concentration effects in the base-catalyzed hydrolysis of water-soluble methacrylates (3-(N,N-dimethylaminoethyl) methacrylate (DMAEMA), 2-hydroxyethyl methacrylate (HEMA) and oligo(ethylene glycol) methacrylates (OEGMAs)) have been studied. These monomers are rapidly hydrolyzed in the presence of bases at the room temperature in dilute aqueous solutions, but the reaction rate decreases sharply in highly concentrated solutions. A clear correlation was found between a form of the viscosity isotherm for DMAEMA solutions and the concentration dependence of the autocatalytic hydrolysis rate which indicates the connection of process kinetics with the structure of solutions. These data should be considered when carrying out homo- and copolymerization of the previously mentioned monomers in aqueous solutions. 相似文献
48.
Zoltan Zyman Matthias Epple Anton Goncharenko Dmytro Rokhmistrov Oleg Prymak Kateryna Loza 《Journal of materials science. Materials in medicine》2017,28(3):52
Thermal evolution of amorphous calcium phosphate (ACP) powder from a fast nitrate synthesis with a Ca/P ratio of 1:1 were studied in the range of 20–980?°C. The powder consisted of amorphous dicalcium phosphate anhydrate (CaHPO4) after heating to 200?°C. CaHPO4 gradually condensed to amorphous calcium pyrophosphate Ca2P2O7 (CPP) between 200 to 620?°C. Amorphous CPP crystallized at 620–740?°C to a metastable polymorph α′-CPP of the high-temperature phase α-CPP and β-CPP. The α′-CPP/ β-CPP phase ratio reached a maximum at 800?°C (60?wt% α′-CPP/40?wt% β-CPP), and α′-CPP gradually transformed to β-CPP at a higher temperature. Some β-TCP occurred at 900?°C, so that a three-phasic mixture was obtained in the powder heated to 980?°C. The occurrence of metastable α′-CPP is attributed to Ostwald’s step rule, and a mechanism for β-TCP formation is proposed. The advantages of prospective biomaterials from these powders are discussed. 相似文献
49.
Carlo S. Iorio Olga Goncharova Oleg A. Kabov 《Microgravity science and technology》2009,21(Z1):313-319
When a layer of volatile liquid is exposed to a shear flow of inert gas, thermal patterns, in the form of interfacial ripples
and bulk plumes, are created by the combined action of evaporative, shear-driven and surface-tension-driven instabilities.
The topology of the interfacial thermal patterns is mainly influenced by the geometry of the evaporating surface, the thickness
of the evaporating layer, the intensity of the shear flow and by the physic-chemical properties of the working fluid. In this
paper, by means of numerical simulations, we focused our attention on the dynamics of the interfacial thermal patterns for
different working fluids and thicknesses of the volatile liquid layer. This study has been performed in the frame of the ESA
sponsored Space Program on heat and mass transfer CIMEX-1. The choice of the fluids—ethyl alcohol and FC72 (n-perfluorohexane)—the
reference values for the inert gas flow rate, the thickness of the liquid layer as well as the geometrical features of the
computational domain correspond exactly to the ones foreseen for the CIMEX-1 experiment. However, the main conclusions can
be considered of more general validity. 相似文献
50.
The results of activity made in the framework of preparation of the experiment SAFIR (Single fin condensAtion: FIlm local measuRements) of European Space Agency are presented. First prototype of the test cell has been developed and tested. Confocal technique has been adopted for condensate film thickness measurements. Experiments on condensation of the liquid FC-72 have been carried out. Average heat transfer coefficient has been measured in the range of 880–1440 W/m2 K and compared to the Nusselt theory. 相似文献