液相分散法制备Sn-Cd合金纳米微粒

在液相中依靠超声粉碎和剪切搅拌相结合的方法成功制备了Sn-Cd合金纳米微粒,并利用透射电子显微镜（TEM）、X-射线粉末衍射（XRD）、热分析（TG-DTA）等手段对合金纳米微粒的形貌和结构进行了表征,同时对合金纳米微粒用作润滑油添加剂的摩擦学性能进行了探讨.     

纳米微粒的制备方法及其进展

综述目前纳米微粒的各种制备方法 ,比较和评述了每种方法的特点 ,以期这一新材料能得以更为深入地研究和更广泛地应用     

γ-Fe203和Fe纳米微粒的制备及相组成

用共沉淀法制备γ-Fe203和Fe纳米微粒，用X-射线衍射和TEM研究其相结构和形貌，并对影响相组成的因素进行了分析。     

CaMnO_3纳米微粒的制备和性能研究

用溶胶-凝胶法（sol-gel）制备了CaMnO3纳米微粒并用X射线衍射观察其相结构,实验发现其晶格常数随着晶粒线度的减小而减小。     

γ-Fe2O3和Fe纳米微粒的制备及相组成

用共沉淀法制备γ-Fe2O3和Fe纳米微粒,用X-射线衍射和TEM研究其相结构和形貌,并对影响相组成的因素进行了分析。     

SnO2纳米微粒的制备方法及其进展

综述目前SnO2纳米微粒的常用制备方法,简要分析了各类制备方法的基本原理及特点.在归纳、总结和比较的基础上,指出了制备SnO2纳米微粒有发展潜力和应用前景的方法,并对制备SnO2纳米微粒的发展前景作了简要的介绍.     

铜基纳米结构疏水表面冷凝传热实验研究

为研究纳米结构差异性对冷凝传热性能的影响,通过化学刻蚀法、电化学沉积法、水热法等方法制备了不同结构的Cu(OH)_2纳米线、C_(36)H_(70)CuO_4纳米片及CuO纳米花等疏水表面。实验测得Cu(OH)_2纳米线表面静态接触角最大,达到151.9°;而C_(36)H_(70)CuO_4纳米片表面和CuO纳米花表面接触角较为接近,分别为130.5°和124.7°。通过冷凝传热对比实验发现,Cu(OH)_2纳米线和CuO纳米花结构表面能够维持稳定滴状冷凝,且CuO纳米花结构表面传热性能最佳。虽然液滴在C_(36)H_(70)CuO_4纳米片表面成核密度最大,但由于无法维持稳定的滴状冷凝,其传热性能不到纳米花表面的50%。此外,传热性能测试实验后,Cu(OH)_2纳米线和CuO纳米花表面性质基本保持不变,但C_(36)H_(70)CuO_4表面接触角下降到82.6°,试样表面的片状多孔纳米结构因C_(36)H_(70)CuO_4在高温蒸汽中分解而受到破坏。     

纳米材料的物理制备方法

重点在于对纳米材料的分类、相关的应用领域及其物理的制备方法进行了较系统的概述，在此基础上来促进纳米材料的物理制备方法的新发明。     

Ni纳米微粒的制备和性能研究

用溶液还原法和氧化还原法两种方法制备了Ni纳米微粒.用X射线衍射和TEM分别研究了其相结构和形貌.     

纳米微粒对仿真幕墙表面硬度的影响

采用纳米微粒对氟树脂进行改性,分别选用了SiO2、TiO2、ZnO三种微粒进行实验,并分析了纳米微粒的种类和用量对漆膜硬度的影响,综合分析纳米SiO2对涂膜的硬度改性效果最好,而且其用量也较小.     

制冷装置的冷凝压力和蒸发压力的自动调节与自动保护分析

对蒸气压缩式制冷装置的性能(主要包括冷凝压力、蒸发压力、制冷装置的自动保护和自动调节)进行了分析.通过各种调节作用,使制冷剂状态参数在各部件或制冷系统典型部位具有合理的取值,以满足被控工艺参数的要求以及制冷装置的安全、稳定、高效节能运行.     

Fibrous TiO2 prepared by chemical vapor deposition using activated carbon fibers as template via adsorption, hydrolysis and calcinations

TiO2 fibers were prepared via alternatively introducing water vapor and Ti precursor carried by N2 to an APCVD （chemical vapor deposition under atmospheric pressure） reactor at ≤200 ℃. Activated carbon fibers （ACFs） were used as templates for deposition and later removed by calcinations. The obtained catalysts were characterized by scanning electron micros- copy （SEM）, transmission electron microscopy （TEM）, Brunauer, Emmett and Teller （BET） and X-ray diffraction （XRD） analysis The pores within TiO2 fibers included micro-range and meso-range, e.g., 7 nm, and the specific surface areas for TiO2 fibers were 141 m^2/g and 148 m^2/g for samples deposited at 100 ℃ and 200℃ （using ACFI700 as template）, respectively. The deposition temperature significantly influenced TiO2 morphology. The special advantages of this technique for preparing porous nano-material include no consumption of organic solvent in the process and easy control of deposition conditions and speeds.     

Fibrous TiO2 prepared by chemical vapor deposition using activated carbon fibers as template via adsorption, hydrolysis and calcinations

TiO2 fibers were prepared via alternatively introducing water vapor and Ti precursor carried by Ne to an APCVD (chemical vapor deposition under atmospheric pressure) reactor at <200 ℃. Activated carbon fibers (ACFs) were used as templates for deposition and later removed by calcinations. The obtained catalysts were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Brtmauer, Emmett and Teller (BET) and X-ray diffraction (XRD) analysisThe pores within TiO2 fibers included micro-range and meso-range, e.g., 7 nm, and the specific surface areas for TiO2 fibers were 141 m2/g and 148 m2/g for samples deposited at 100 ℃ and 200 ℃ (using ACF1700 as template), respectively. The deposition temperature significantly influenced TiO2 morphology. The special advantages of this technique for preparing porous nano-material include no consumption of organic solvent in the process and easy control of deposition conditions and speeds.     

电化学制备纳米银

在配位剂N'－羟乙基乙二胺－N，N，N'-三乙酸存在下用电化学方法制备出树枝晶纳米银，并用X射线衍射（XRD）和透射电子显微镜（TEM）对该纳米粒子进行了表征。     

微波合成纳米硒化锌

以N a2SeSO3和Zn(A c)2.2H2O为源材料,通过微波辐射加热合成了ZnSe半导体纳米粒子,并用XRD和TEM进行了表征.     

Removal of hexavalent chromium from aqueous solution by iron nanoparticles

Groundwater remediation by nanoparticles has收稿日期increasing interest in recent years. This report presents a thorough evaluation of hexavalent chromium removal in aqueous solutions using iron (Fe0) nanoparticles. Cr(Ⅵ) is a major pollutant of groundwater. Zero-valent iron, an important natural reductant of Cr(Ⅵ), is an option in the remediation of contaminated sites, transforming Cr(Ⅵ) to essentially nontoxic Cr(Ⅲ). At a dose of 0.4 g/L, 100% of Cr(Ⅵ) (20 mg/L) was degraded. The Cr(Ⅵ) removal efficiency decreased significantly with increasing initial pH. Different Fe0 type was compared in the same conditions. The reactivity was in the order starch-stabilized Fe0 nanoparticles＞Fe0 nanoparticles＞Fe0 powder＞Fe0 filings. Electrochemical analysis of the reaction process led to the conclusion that Cr(OH)3 should be the final product of Cr(Ⅵ). Iron nanoparticles are good choice for the remediation of heavy metals in groundwater.     

Science Letters:Development of supported boron-doping TiO2 catalysts by chemical vapor deposition

In this study, supported nonmetal (boron) doping TiO2 coating photocatalysts were prepared by chemical vapor deposition (CVD) to enhance the activity under visible light irradiation and avoid the recovering of TiO2. Boron atoms were successfully doped into the lattice of TiO2 through CVD, as evidenced from XPS analysis. B-doped TiO2 coating catalysts showed drastic and strong absorption in the visible light range with a red shift in the band gap transition. This novel B-TiO2 coating photocatalyst showed higher photocatalytic activity in methyl orange degradation under visible light irradiation than that of the pure TiO2 photocatalyst.     

Water-dispersed bone morphogenetic protein nanospheres prepared by co-precipitation method

INTRODUCTION Bone morphogenetic proteins (BMPs) are agroup of proteins that can induce new bone forma-tion at orthotopical and heterotopical sites in ex-perimental animals (Urist et al., 1983; Groeneveldand Burger, 2000). Their biological activity hasstimulated interest in its clinical use for bone repair.In clinical use, BMPs are undergoing evaluationincluding system administration, gene transfer andlocal matrix delivery vehicle implantation (Kirker-Head, 2000; King et al., 199…     

Water-dispersed bone morphogenetic protein nanospheres prepared by co-precipitation method

A modified complex coacervation-co-precipitation method was used to prepare bone morphogenetic protein(BMP)-loaded nanospheres. Three natural polymers were used as packing materials to obtain nanoscale delivery device for BMP,in the presence of phosphatidylcholine functioning as stabilizer. Positively charged polysaccharide, N,N-diethylaminoethyl dex-tran (DEAE-dextran) tended to form stable, uniform and smaller size particles carrying BMP. Negatively charged bovine serumalbumin (BSA) induced precipitation of the produced BMP particles due to its weak interaction with BMP molecules, although itproduced nanosized BMP spheres. While collagen, a weakly positively charged protein shaped larger particles due to the stronginteraction among themselves. A mechanism of co-precipitation process was also deduced to depict the formation of stablenanospheres.