高纯超细钛酸锶的研制

本文介绍了采用“化学液相共沉淀法”利用工业级原材料制备高纯超细钛酸锶的工艺方法及应用情况,为本行业增加一个精细品种。

2016全国绿色成形技术学术会议暨2016全国管材成形技术学术会议

为推动我国绿色成形技术、特别是以复杂管件成形为代表的成形新技术和新工艺的发展,促进学术思想和学术成果的交流,由中国机械工程学会塑性工程分会绿色成形制造技术学术委员会、管材成形技术学术委员会同期主办、联合召开,哈尔滨工业大学金属精密热加工国家重点实验室承办的＂2016全国绿色成形技术学术会议暨2016全国管材成形技术学术会议＂将于2016年9月23日～25日在黑龙江省哈尔滨工业大学召开。

深圳市包装行业协会领导考察包装产业园拟选地址

日前,深圳市包装行业协会会长欧阳宣、副会长兼秘书长罗少敏到龙华新区观澜街道、大浪街道相关工业园察看协会规划组建包装产业园拟选地址,为产业园最终选定地址作了现场论证和科学预判。为提升包装产业在市场的整体竞争力,促进资源共享和互利共赢,协会2014年年会提出了组建包装产业联盟重大战略构想,其形式与做法是以包装行业企业为主体,充分发挥业内龙头企业的引领带动作用,联合包装产业上中下游企业和相关科研院所,在技术研发、生产制造、示范应用、市场开拓等方面谋求合作,在原材料制备、关联产品供应、关键装备研制、终端产品制造、

2015年预拌混凝土产业发展现状

预拌混凝土产业是近十年来,特别是近五年来异军突起的建筑材料产业,产值超过一万亿,目前已形成了从材料设计、原材料制备、混凝土生产到运输物流的产业链,有些企业向上延伸到骨料和矿物掺合料,向下游延伸到混凝土施工环节。借助国家近年来的经济发展动力,预拌混凝土产业已经取得了长足的进步。但因为经济转型与产能严重过剩,预拌混凝土产业依靠速度和企业规模实现发展的路径已走到尽头,

中药配方颗粒的研究进展

从某种程度上说,中药配方颗粒当属天然药物,且其可在理论指导下依据证候变化而加减成分,其优越的功效及便捷性不仅获得国内广大患者的认可,在境外也颇受青睐,成为助推中药国际化发展的不竭动力。然而在人们健康意识不断增强和经济全球化持续推进的大环境下,境内外医学人士对中药配方颗粒的药效、产品标准及应用安全性尚存在争议,若不及时采取措施加以干预,中药配方颗粒行业的国际化发展或将进入瓶颈期。基于此,笔者将对中药配方颗粒在境内外的应用情况作简要分析,并探讨其原料制备及工艺研究现状,道明当前中药配方颗粒存在的发展问题,同时提出相关发展建议,以供相关企业及从业者参考。

Preparation and characterization of carbonyl iron soft magnetic composites with magnesioferrite insulating coating layer

Spherical carbonyl iron(Fe)powders were coated with magnesioferrite(MgFe2O4)insulating coating layer and then mixed with epoxy-modified silicone resin(ESR).Soft magnetic composites(SMCs)were fabricated by compaction of the coated powders and annealing treatment.Transmission electron microscopy(TEM),scanning electron microscopy(SEM),energy dispersive spectroscopy(EDS),X-ray diffractometry(XRD)and X-ray photoelectron spectroscopy(XPS)revealed that the MgFe2O4 layer was coated on the surface of the iron powders.The magnetic properties of SMCs were determined using a vibrating sample magnetometer and an auto testing system for magnetic materials.The results showed that the SMCs prepared at 800 MPa and 550℃ exhibited a significant core loss of 167.5 W/kg at 100 kHz and 50 mT.

Aluminum matrix composites reinforced by in situ Al_2O_3 and Al_3Zr particles fabricated via magnetochemistry reaction

Aluminum matrix composites reinforced by in situ Al2O3 and Al3Zr particles are fabricated from A356-Zr(CO3)2 system via magnetochemistry reaction,and the morphologies,sizes and distributions of the in situ particles as well as the microstructures,mechanical mechanisms of the composites are investigated by XRD,SEM,TEM and in situ tensile tests.The results indicate that with the pulsed magnetic field assistance,the morphologies of the in situ particles are mainly with ball-shape,the sizes are in nanometer scale and the distributions in the matrix are uniform.The interfaces between the in situ particles and the aluminum matrix are net and no interfacial outgrowth is observed.These are due to the strong vibration induced by the applied magnetic field in the aluminum melt,which in turn,accelerates the melt reactions.The effects of the magnetic field on the above contributions are discussed in detail.

Preparation of Mesoporous Carbons from Acrylonitrile-methyl Methacrylate Copolymer/Silica Nanocomposites Synthesized by in-situ Emulsion Polymerization

Acrylonitrile-methyl methacrylate （AN-MMA） copolymer/silica nanocomposites were synthesized by in-situ emulsion polymerization initiated by 2,2＇-azobis（2-amidinopropane） dihydrochloride absorbed onto colloidal silica particles, and the mesoporous carbon materials were prepared through carbonization of the obtained AN-MMA copolymer/silica nanocomposites, followed by HF etching. Thermogravimetric analysis of AN-MMAcopolymer/silica nanocomposltes snoweO mat me caroon ylelCl or copolymer was slgnuy oecreaseo as Silica parucle incorporated. N2 adsorption-desorption, scan electron microscopy （SEM） and transmission electron microscopy （TEM） were used to characterize the structure and morphology of the mesoporous carbon materials. Both SEM and

Fabrication of tunable hierarchical MXene@AuNPs nanocomposites constructed by self-reduction reactions with enhanced catalytic performances

MXene, a new type of two-dimensional layered transition metal carbide material differing from graphene, demonstrates intriguing chemical/physical properties and wide applications in recent years. Here, the preparation of the self-assembled MXene-gold nanoparticles （MXene@AuNPs） nanocomposites with tunable sizes is reported. The nano- composites are obtained via the self-reduction reactions of MXene material in a HAuCI4 solution at room temperature. The sizes of the Au particles can be well-controlled by reg- ulating the self-reduction reaction time. They can greatly in- fluence the catalytic behaviors of the MXene@AuNPs composites. MXene@AuNPs composites with optimized re- duction time show high catalytic performances and good cycle stability for model catalytic reactions of nRro-compounds, such as 2-nitrophenol and 4-nitrophenol. This work demon- strates a new approach for the preparation of tunable MXene- based self-assembled composites.

One-step scalable preparation of N-doped nanoporous carbon as a high-performance electrocatalyst for the oxygen reduction reaction

N-doped porous carbon materials have been prepared by a simple one-step pyrolysis of ethylenediaminetetraacetic acid （EDTA） and melamine in the presence of KOH and Co（NO3）2·6H20. The combination of the high specific area （1,485 m2.g-l）, high nitrogen content （10.8%） and suitable graphitic degree results in catalysts exhibiting high activity （with onset and half-wave potentials of 0.88 and 0.79 V vs the reversible hydrogen electrode （RHE）, respectively） and four-electron selectivity for the oxygen reduction reaction （ORR） in alkaline medium---comparable to a commercial Pt/C catalyst, but far exceeding Pt/C in stability and durability. Owing to their superb ORR performance, low cost and facile preparation, the catalysts have great potential applications in fuel cells, metal-air batteries, and ORR-related electrochemical industries.

In-situ wet tearing based subnanometer MoSeS for efficient hydrogen evolution

The development of ultrasmall transition-metal dichalcogenide（such as MoS_2,MoSe_2） nanostructures is an efficient strategy to increase the active edge sites and overall performance for hydrogen evolution reaction. Here,we report an in-situ tearing strategy to produce the carbon nanotube supported subnanometer ternary MoSeS（denoted as CNTs@NiSe@MoSeS） for efficient hydrogen evolution. Large（18.3 ± 1.1nm in length） multilayer MoS_2 sheets grown on Ni（OH）_2 thin film are torn into subnanometer（5.2 ± 0.7 nm in length） MoSeS via a subsequent selenization progress,along with the transformation of Ni（OH）_2 thin film into small Ni Se nanoplates. The resulting nanocomposite exhibits abundant active edge sites,outstanding 10,000-cycle stability and ultrahigh activity with a low overpotential of 189 mV at a high current density of 200 mA cm^（-2） toward hydrogen evolution.

A facile grinding approach to embed red phosphorus in N,P-codoped hierarchical porous carbon for superior lithium storage

Despite red phosphorous(P)-based anodes hold great promise for advanced lithium-ion batteries due to their high theoretical capacity, their practical application is hindered by poor electronic conductivity and drastic volume changes during charge-discharge processes. In order to tackle these issues, herein, a facile grinding method was developed to embed sub-micro-and nano-sized red P particles in N,P-codoped hierarchical porous carbon(NPHPC). Such a unique structure enables P@NPHPC long-cyclic stability(1120 mAh g^-1 after 100 cycles at 100 mA g^-1) and superior rate performance(248 mA h g^-1 at 6400 mA g^-1). It is believed that our method holds great potential in scalable synthesis of P@carbon composites for future practical applications.