Materials Literature
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Protein is an important macro molecular organic compound that body need to maintain itself and grow.Proteins are linear polymers made of 20 kinds of amino acids linked by peptide bonds,which fold into unique 3-dimensional structures.Biological functions are closely related to protein structure dynamics, and different…
Al2O3 and Al2O3-SiC composite ceramics were fabricated by hot pressing in vacuum,and their friction and wear properties were measured.The effects of the SiC addition on the friction and wear properties of the composites were investigated.The results show that the Al2O3-SiC composite with 5% in mass SiC hot-pressed at…
The effects of various additives on the electrochemical behavior of cathode and macro-and micro-morphology,surface roughness,thickness,and polarization resistance of Zn-Ni alloy coating were investiga-ted by making use of potentiodynamic polarization curve measure-ment,optical microscopic and scanning electron microsc…
The curing process of epoxy resin-hyperbranched PAMAM system at four different heating rates 5,10,15,and 20 ℃/min was investiged by the non-isothermal differential scanning calorimetry(DSC) method.The apparent activation energy(ΔE) was 54.9 kJ/mol which was calculated by Kissinger method.The curing kinetics parameters…
Silicon oxide films were prepared by RF magnetron reactive sputtering on a monocrystalline silicon wafer;and the composition and influence of the preparation process on the surface morphology and electric breakdown strength were studied.The results show that the main composition is silicon oxide;the surface roughness…
In order to investigate the output characteristic of proton exchange membrane fuel cell (PEMFC), a novel dynamic model of PEMFC was developed including gas flow model and thermodynamics model based on previous model by using Matlab-Simulink. The comprehensive results of simulation manifest that the model can reflect t…
SrBi2Ta2O9 (SBT) ferroelectric thin film and powder samples were fabricated by using metal-organic decomposition (MOD) method. XRD and SEM results show that SBT powders still remain polycrystalline perovskite structure and amounts of Bi and δ-Bi2O3 are reduced from SBT annealed in the forming gas at 400℃. Spherical an…
Mullite-corundum kiln furniture materials were prepared by using tabular corundum,fused mullite,Al2O3 powder,sillimanite and clay as raw materials,influences of different zircon addition on the mechanical properties and thermal shock resistance of the samples were researched.Results showed that with the increasing of…
Basic magnesium chloride nano-rod are prepared with MgCl2·6H2O and light MgO as rawmaterials,and magnesium hydroxide nano-rod with diameters from 100 nm to 200 nm and an average 6～10 μm of lengths are synthesized with basic magnesium chlorides nano-rod as precursor by converting precipitation method.Kinetics of isothe…
Monolithic silica aerogels were prepared by sol–gel method followed by CO2 supercritical drying. Silica aerogels with different pore size and pore size distributions(PSD) were obtained by changing the cycle pressure of liquid CO2 extration. The N2 adsorption at 77 K was used to characterize the porous structure of the…
To solve the problem that the on-line estimation of operating parameters becomes more complicated when converting complete catalyst regeneration into conventional catalyst regeneration in FCCU,a new solution composed of regeneration's dynamical mechanism model and heat balance of CO incinerator is developed.Using on-l…
The surface of silver coated aluminum powder was modified by silane coupling agents and the effects of addition level of the silver coated aluminum powder on the properties of silver coated aluminum powder/silicone rubber conductive composites were investigated.The results showed that,when the silver coated aluminum p…
The aluminized coating with different La content on low carbon steel 20 was prepared by hot dip aluminizing method.The effect of La content on the formation and growth of voids along the interface between the aluminized coating and steel substrate of aluminized steel were investigated by means of cyclic oxidation test…
The geometries of the ground and the first excited states of the meta amino derivatives(4-AHBO) and the para amino derivatives(5-AHBO) of 2-(2′-hydroxyphenyl)benzoxazole were optimized with quantum chemical calculations,and the relative stabilities of their isomers in different solvents were analyzed in detail.The abs…
Polyester and CR-39 samples were irradiated with sulphur ion from HI-13 tandem accelerator.Ultraviolet light with wavelength 360 nm was used to sensitize the polymer before chemical etching by NaOH solution with different temperatures and time duration.The latent track was then developed into nanometer to micrometer p…
Pure iron was alloyed by double glow plasma surface alloying technique with three different sources of W,W-Mo,W-Mo-Co at the same alloying parameters.The thicknesses of the surface alloy layers with three different sources were compared.Interaction of W,Mo,Co in diffusion were analysed from diffusion thermodynamics,di…
The novel graft copolymer was synthesized by the graft copolymerization of Hydroxyethylcellulose(HEC) with 2-acrylamido-2-methyl propanesulfonic acid(AMPS) using cerium ammomium nitrate/nitrate acid(CAN/HNO3) as the initiator.The copolymer was characterized by IR and 1H-NMR.The effects of monomer content,initiator con…
Zinc-nickel coating was prepared from zinc powders and soluble nickel salt by mechanical plating.The phase composition of the coating was studied by means of X-ray diffraction(XRD),while the content of nickel in the coating was analyzed using in-ductively coupled plasma atomic emission spectrometry(ICP-AES).Moreover,t…
Influence of α andβ nucleating agents on the mechanical properties of talcum powder/polypropylene(Talc/PP) blends was studied. The results show that addition of α nucleating agent can increase the tensile strength, flexural strength, flexural modulus and hardness, etc of the materials, but slightly decrease the impact…
A series of orthogonal tests were carried out to investigate the technology for manganese sys-tem phosphating of 30CrNi3 alloy steel at elevated temperatures. The effects of total acidity, ratio of total acidity to free acidity, ferrous ion concentration, activation time and phosphating time on the mass per unit area…