Materials Literature
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Effect of grain boundary diffusion treatment on magnetic properties and structures of sintered Nd-Fe-B magnet with high Dy content was investigated. Using Dy vapor sorption process, the coercivity of high Dy content magnet increases from 1 713 kA/m to 2 161 kA/m without decrement of remanence or maximum energy product…
Straight-parallel flow field of proton exchange membrane fuel cells( PEMFC) causes the poor flow because of its lowest pressure drop and branch channel between the traditional gas-distributor plane. It gives rise to the problem of severe flow distribution in the flow field. As a consequence,the mass transfer and elect…
Monomer of SCMHBMA with 2-ureido-4[1H]-pyrimidone(UPy)group and monomer of A6 ACA with alkyl group were synthesized.Novel quadruple hydrogen-bonding supramolecular network polymer was polymerized from the two monomers.The structures of monomers and polymer were characterized by infrared spectrum(IR),hydrogen nuclear m…
The K417 G alloy samples at various pouring temperature were studied. The results show that the morphologies of phase were different at pouring temperature 1 450 ℃ and 1 500 ℃ in K417 G alloy. The block carbide was observed in alloy pouring at 1 450 ℃, the edge of γ′phase has been blunted, the length of the γ′phase is…
The active carbon doped with CoOX/CeO2 binary oxide was prepared by the process of dipping and calcinations in inert gas.The performance of obtained CoOX/CeO2 doped active carbon for low concentrate NOXadsorption was investigated at room temperature.Scanning electron microscopy(SEM),thermogravimetry(TG),X-ray powder d…
The modification of mineral fiber in different ways and its effect on paper properties were studied. The results showed that the better method of surface modification is modified by cationic starch. The optimal technical conditions are as follows: glyoxal dosage 1.2 mL·g-1, modifier dosage 30%, temperature 60℃ and rea…
Highly interconnected porous hydroxyapatite(HA)scaffolds with high porosity(≈78%)were prepared by particle leaching method in the present work,and subsequently the as-prepared HA scaffolds were lined with PCL/nano-HA(nHA)or PCL/micro-nano-bioglass(nBG)composite coatings,the contents of the powder were varied from 10%t…
Alkyl polyglucosides based on renewable lauryl alcohol and glucose were synthesized using one-step method. A physical model was established to illustrate the reaction process based on the study of reaction conversion and reaction selectivity under different conditions such as catalyst system, catalyst concentration, t…
Self-assembled monolayers(SAMs)on the metal surfaces is developed as a new technology of surface functionalization in recent years.A certain amount of overviews about researches on self-assembled monolayers for gold,silver,copper and iron-based metals can be consulted.However there has no systematic introduction for r…
The development situation,the effects of Ti in magnesium alloys and the preparation methods of Mg-Ti alloys in recent years were carried out systematically.The preparation methods of mechanical alloying,spark plasma sintering,physical vapor deposition and vapor phase quenching process for Mg-Ti alloy were introduced,t…
The research progress in catalysts and production technologies of butane catalytic dehydrogenation at home and abroad were reviewed with 26 references. The preparation methods and properties of butane catalytic dehydrogenation catalysts including Pt,V and Cr systems were described,and the main technical features of fo…
2-(3,4-Methylenedioxyphenyl)ethylamine and 2-hydroxy-3-methoxybenzaldehyde were selected to synthesize a new Schiff base(L)as bioactive ligand.The reaction of L with ZnCl2·2H2O afforded the binuclear zinc(Ⅱ)complex(1),which was structurally characterized by IR,elemental analysis,ESI-MS,and single crystal X-ray diffrac…
Barium titanate powder has higher permittivity, lower dielectric loss, good ferroelectric, piezoelectricity and electric insulation properties. Barium titanate is a type of ceramic material widely used in electronics industry for fabrication of multilayer ceramic capacitors, memory materials, and so on. Preparation an…
ZnO quantum dots were prepared by homogeneous precipitation using anhydrous zinc chloride(as raw material)and sodium hydroxide(as precipitant)with stirring for 24hat room temperature.Mechanism of interaction of ZnO QD′s with acridine orange(ADO)was studied by fluorophotometry and UV-Vis absorption spectroscopy.It was…
Isopropyl xanthate sodium( SIP) and N-Ethyl-N-phenyldithiocarbamic Acid Zinc Salt( PX),1. 5 and 0. 5phhr respectively,are applied to make up complex accelerator system,and cause the NR / BR blends( with a blending ratio of 70 ∶ 30) fast curing at 90℃ ~ 95℃. The vulcanization characteristics meet requirements of the cu…
Molecular dynamics simulations of hydrogenated amorphous silicon(a-Si∶ H) thin film growth on the crystal silicon(100) have been carried out.The atomic interaction in Si-H system is calculated by Murty-Tersoff potential.The results show that,as the substrate temperature increased,the surface roughness of a-Si∶ H thin…
The development history and the present situation of polyvinyl chloride were summarized.The research achievements were introduced about blending modification on PVC in domestic literature of science and technology in recent years.The technical progress was also introduced about blending modification on PVC in overseas…
The characteristics and advantages of cored-wire injection nodularizing,inoculating and modifying-purifying treatment technique were introduced. The effects of using pour-over process and cored-wire injection process for production of QT450-10 grade nodular iron and Cr25 type wear resistant white cast iron were compar…
By the special chelating properties of sodium alginate and CaCl2,the 3-1 type porous PZT ceramic with 85% porosity and 200 μm characterized by highly ordered and unidirectional oriented pores in the micrometer was made with a 10wt% solid loading. In this paper,we studied the influence of CaO content on the electrical…
The effects of nickel chloride concentration on surface morphology, grain orientation and size of the Ni thick films electroplated from a nickel sulfamate bath were studied. Then the tensile strength and hardness of the normative deposits were tested. The results show that the grains of the Ni platings present obvious…