Materials Literature
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Patterns of cathode obviously influence the luminescence properties of field emitter materials.The Si-TaSi2 eutectic in situ composite prepared by Czochralski(Cz) crystal growth technique was used to prepare field emitters by wet corrosion.The effects of HF/HNO3 concentration,corrosion time and temperature of solution…
Spherical and cubic nanoparticles of cobalt-iron Prussian blue analogues (NaKCoFe PBA) with morphologies from 5 nm sphere to 80 nm cube were synthesized in sodium bis (2-ethylhexyl) sulfosuccinate(AOT) / isooctane/water microemulsion, by tuning the water-to-surfactant molar ratio (w) and the concentration ratio of rea…
Au_(38)-O_2, Au_(38)- H_2O, and Au_(38)-H_2O-O_2 systems have been investigated by Density Functional Theory (DFT). The studies of geometry, energy and electronic behavior show that O_2and H_2O tend to adsorb on edge sites and top sites respectively. It is found that O_2, H_2O are more favorable on Au (100) than Au (1…
The room temperature absorption and fluorescence spectra of Er3+/Yb3+:KY(WO4)2(KYW)were measured.According to the theory of Judd-Ofelt,the optical parameters of Er3+ in Er3+/Yb3+:KYW were calculated.The critical transfer distance R0,the average doped ions distance R and the energy transfer interaction parameter C were…
Polytetrafluoroethylene(PTFE),especially PTFE thin film and plate,was wildly used in many kinds of industrial fields.In chemical power sources and fuel cell,PTFE was mainly used as adhesive.The studies of PTFE were mainly aiming at the modification of PTFE thin film and plate;the researches as adhesive were a few.The…
Objective:To prepare the ultrasound microbubble by using bio-degradable copolymer PLA/GA/PEG(PLGE),and explore its effect of enhancing ultrasound imaging in vitro experiment.Methods:The multiple emulsion technique was required to prepare PLGA ultrasound microbubbles.Scanning electron microscope and light microscope we…
The influence of DC magnetic fields on the solidification structure of the Al-7%Si alloy was studied.It was found that,the Si content inside grain was increased in the sample with the DC magnetic field compared to the sample without magnetic field.The dendritic of the primary α-Al was long with the DC magnetic field a…
determining,strong polarization curves and polarized potential distribution.SEM and XRD were used to analyze the microstructure of samples and corrosion products.The results show that the corrosion rates of welding material,HAZ and base metal in seawater are all small,between 16～20μA.cm-2,and the cathodic reaction is…
In response to the properties of the casting magnesium,this paper describes the investigation into the effects of isothermal and isobaric heat-treatment on microstructure and hardness of AM50 magnesium alloy and the reason of the microstructure transformation.The experiment results show that,isothermal heat treatment…
Using Ni(Ac)2·4H2O as raw material,anhydrous alcohol as solvent and reductant,the hollow nickel spheres were prepared by the ethanol-thermal reduction method in stainless steel autoclave at 230℃ for 24 h.The microstructure and magnetic property of prepared nickel spheres were studied with TEM,SEM and XRD.The results s…
A series of Yb3+∶Eu3+ co-doped silicate glasses have been prepared by high-temperature melting.The photoluminescence(PL)spectra of the samples are measured(excited with a 978 nm semiconductor laser),and up-conversion mechanism is discussed.The results show that the PL intensity of Eu3+ ions at 694 nm enhances with inc…
Latest advances in linear low density polyethylene(LLDPE) catalysts were reviewed,including metallocene catalysts,composite catalysts,non-metallocene catalysts,bifunctional catalysts and Late-transition-metal catalysts,and so on.
Orthogonal experiments were carried out to determine the optimized bath composition and parameters(concentration of NajMoO,,? 2H2O and NaH2PO4 ? 2H2O,pH value,film-formation temperature,filmformation time) for preparing molybdate conversion coating on AZ91D Mg alloy.The composition and morphology of resultant coating…
Poly (3,4-ethylene dioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) film,which is widely used and studied in organic photovoltaic field,especially in organic solar cells and organic light-emitting diodes,has excellent performance,such as high conductivity,high transmission of visible light,high stablity and easy pro…
Nuclear power station will produce some waste when it is circulating and changing the fuel.This waste is either non-radioactive(waste gas,waste heat,chemistry product),or radioactive(gas,liquid,solid).In order to protect the environment from the radioactive contamination,prevent the excessive atomic irradiation to the…
Viscosity and its stability over time of PVC plastisols were studied based on compounds of two different PVC paste resins,suspension polymerized ones(P1) and MSP-3 ones(P2).P1 had a similar polymerization degree with that of P2.When the ratio of P1/P2 is 80/20,the plastisol exhibited the highest viscosity and worst st…
In order to probe into the compatibility of various retarder components and polycarboxylic water-reducer,this essay discusses the influence of four usually used retarders,including citric acid,sodium gluconate,sodium hexametaphosphate and cane sugar,on the fluidity,lose of fluidity,setting time and bending strength as…
The influence of volume fraction of ZnO and the interfacial layer on the thermal and mechanical properties of the thermal conductive ZnO/PP composite were investigated in order to determine the ratio of PP matrix to filler,to find the suitable surface treatment method and to balance the mechanical and thermal properti…
The electronic structures of pure and Mg-doped CuAlO_2 were studied by first-principles method based on the density functional theory. The calculations show that donor energy level are formed when substitute Mg for Cu while acceptor energy level are formed when Al is replaced by Mg. The formation energy of Mg-doped Cu…
1,2,3-Tri-O-acetyl-5-deoxy-D-ribofuranose was synthesized from D-ribose by methylation and protection with CuSO4/H2SO4/(CH3)2CO to give 1-O-methyl-2,3-O-isopropylidene-D-ribofuranose,which was subjected to esterification,reduction,deprotection and then acetylation with an overall yield of about 48%.