DDP修饰PbO纳米微粒的摩擦学性能研究

合成了分散性良好 ,粒径约为 5nm的二烷基二硫代磷酸 (DDP)修饰PbO纳米微粒 ,并用四球摩擦磨损试验机考察了其作为润滑油添加剂的摩擦学行为 .结果表明 ,DDP修饰PbO纳米微粒在极低的添加浓度下即具有良好的抗磨效果 ,但是却不能降低基础油的摩擦系数 .摩擦过程中在摩擦表面产生的PbO沉积膜对其摩擦学性能起了主要贡献     

丙烯酸等离子体改性纳米TiO2/PET复合体非等温结晶动力学

为提高纳米颗粒在聚合物中的分散性,使用丙烯酸(AA)等离子体聚合技术,在TiO2纳米粉体表面包覆均匀的有机聚合物薄膜.将AA等离子体改性纳米TiO2分散在乙二醇溶液中,与对苯二甲酸聚和获得了包含丙烯酸等离子体改性纳米TiO2的PET复合体.使用DSC法研究了AA等离子体表面改性纳米TiO2粉体对PET复合体结晶性能的影...     

Dissipative Particle Dynamics Simulation on Bonding Reaction Between Surface Modified Nanoparticles

A simulation study was carried out by using dissipative particle dynamics(DPD) method to explore the effects of properties of coating chains, such as length, density, rigidity of polymer chains, as well as the distance between nanoparticles on bonding reaction of coating chains grafted onto nanoparticles. The results show that bonding ratios of coated chains strongly depend on the length and density of coating chains. For nanoparticles with different coating densities, the optimum chain length for bonding reaction are varied. The rigidity of coating chains exhibits vigorous effects on bonding reaction that highly depends on chain lengths. DPD simulation can be used to study the bonding reaction between coated nanoparticles, which may help experimental synthesis of nanocomposites with excellent properties.     

集成TPN-BG的铝挤压机建模方法研究

铝挤压机系统是一个多液压源、多液压缸的系统,难以使用传统的方法进行数字化建模.为了有效地开展AEM的液压系统设计与性能分析,本文提出一种集成时序Petri网和键合图的铝挤压机建模方法.其中,TPN用于AEM的工序建模,BG图用于液压系统的辅助设计,两者通过有限自动机耦合,可以用于系统全面性能分析.实验结果表明,数字化模型与实际系统具有明确的物理相似性.     

Preparation of Ni/PZT core-shell nanoparticles and their electromagnetic properties

The Ni nanoparticles coated with Pb(Zr,Ti)O_3(PZT) were synthesized by a sol-gel method and in situ reaction. And their structure, oxidation resistance, and electromagnetic properties were investigated. The X-ray diffraction patterns(XRD) exhibited that a small amount of impure phase characterized to Ni(OH)_2 was detected from the ammonia-treated Ni nanoparticles and the ammonia-treated Ni nanoparticles coated with PZT. After being pre-treated with aqueous ammonia, the PZT coating layer was more uniform and about 10 nm in thickness. The oxidation resistance of the ammonia-treated Ni nanoparticles coated with PZT, compared with that of the non-treated ones, was improved by about 66 ℃. The PZT shell layer prepared by in-situ reaction can greatly reduce the dielectric constant and improve the natural resonance loss at high frequency, so as to obtain the optimal impedance matching performance of the electromagnetic wave transmission.     

CeO2纳米粒子的油酸包覆研究

以具有不饱和双键的油酸为表面活性剂,对水溶胶中的CeO2纳米粒子进行表面修饰.TEM分析表明,经表面修饰的CeO2纳米粒子基本呈球形,粒径约为3nm,分布均匀;并且表面包覆油酸的CeO2纳米粒子易溶于弱极性溶剂,不易溶于极性溶剂.     

纳米Ni/SiO_2核壳结构粒子的制备和表征

采用微波多元醇法制备了纳米Ni粒子,再通过水解正硅酸乙酯(TEOS)得到SiO2,实现对纳米Ni粒子的表面包覆,形成Ni/SiO2核壳结构。通过X射线衍射和透射电镜对包覆前后的粒子进行了观察分析。结果表明,微波多元醇法制备的Ni纳米粒子平均粒径100 nm,分散较均匀;包覆后的Ni粒子表面有一层非晶态的SiO2壳层,壳层的厚度随TEOS的浓度增大而增加。     

表面修饰SnS_2纳米粒子的合成及结构表征

利用表面修饰法合成了双十六烷基二硫代磷酸 (DDP)修饰的SnS2 纳米粒子 ,并用红外光谱(IR)、X -射线光电子能谱 (XPS)和透射电子显微镜 (TEM)等仪器对产物的结构、尺寸、形状及化学状态进行了研究 .结果表明 :表面修饰剂与纳米粒子表面之间发生化学键合作用 ,这使得SnS2 纳米粒子的油溶性得以明显改善 ,而且有效地阻止了纳米粒子之间的团聚现象 ,因而所合成的SnS2 纳米粒子大小均匀 ,粒径约为 7nm .     

表面修饰SnS2纳米粒子的合成及结构表征

利用表面修饰法合成了双十六烷基二硫代磷酸（DDP）修饰的SnS2纳米粒子,并用红外光谱（IR）、X-射线光电子能谱（XPS）和透射电子显微镜（TEM）等仪器对产物的结构、尺寸、形状及化学状态进行了研究,结果表明：表面修饰剂与纳米粒子表面之间发生化学键合作用,这使得SnS2纳米粒子的油溶性得以明显改善,而且有效地阻止了纳米粒子之间的团聚现象,因而所合成的SnS2纳米粒子大小均匀,粒径约为7nm。     

AgI纳米有机溶胶的制备与表征

采用油酸萃取并包覆AgI纳米水溶胶,制备了AgI纳米有机溶胶,对有机溶胶的制备条件进行了系统的研究。TEM分析表明,AgI纳米粒子呈球形,粒径小于50 nm,粒度分布均匀。表面包覆油酸的AgI纳米粒子易溶于弱极性溶剂,难溶于极性溶剂。     

Characteristics of magnetic Fe3O4 nanoparticles encapsulated with human serum albumin

Magnetic nanoparticles （Fe304） were prepared by chemical precipitation method using Fe^2＋ and Fe^3＋ salts with sodium hydroxide in the nitrogen atmosphere. Fe3O4 nanoparticles were coated with human serum albumin（HSA） for magnetic resonance imaging as contrast agent. Characteristics of magnetic particles coated or uncoated were carried out using scanning electron microscopy and X-ray diffraction. Zeta potentials, package effects and distributions of colloid particles were measured to confirm the attachment of HSA on magnetic particles. Effects of Fe3O4 nanoparticles coated with HSA on magnetic resonance imaging were investigated with rats. The experimental results show that the adsorption of HSA on magnetic particles is very favorable to dispersing of magnetic Fe3O4 particles, while the sizes of Fe3O4 particles coated are related to the molar ratio of Fe3O4 to HSA. The diameters of the majority of particles coated are less than 100 nm. Fe3O4 nanoparticle coated with HSA has a good biocompatibility and low toxicity. This new contrast agent has some effects on the nuclear magnetic resonance imaging of liver and the lowest dosage is 20μmol/kg for the demands of diagnosis.     

紫杉醇硅胶表面分子印迹纳米颗粒的制备

以紫杉醇为模板分子,紫杉醇上的羟基与异氰酸酯丙基三乙氧基硅烷(IPTS)反应形成共价复合物,然后和交联剂正硅酸乙酯(TEOS)通过溶胶-凝胶的方法涂覆在纳米硅胶表面上,以热裂解的方式去除模板分子后形成紫杉醇硅胶表面分子印迹纳米颗粒。通过吸附实验分析研究了紫杉醇硅胶表面分子印迹纳米颗粒的亲和性能,结果表明印迹纳米颗粒对紫杉醇有良好的亲和性。     

热疗用磁流体的热磁稳定性研究

采用两步法制备了环糊精(β-Cyclodextrin)改性纳米四氧化三铁(Fe3O4)磁流体.通过在交变磁场下感应加热对其磁热稳定性进行了研究,在交变磁场下加热后悬浮裸磁颗粒或改性颗粒的磁性液体最高升温分别达到63℃和53℃,感应加热实验结果表明所制磁流体可用于肿瘤的热疗研究.     

Surface Organic Modification of Fe3O4 Magnetic Nanoparticles

The surface organic modification of Fe3O4 nanoparticles with silane coupling reagent KH570 was studied.The modified and unmodified nanoparticles were characterized by FT-IR,XPS and TEM.The spectra of FT-IR and XPS revealed that KH570 was coated onto the surface of Fe3O4 nanoparticles to get Fe-O-Si bond and an organic coating layer also was formed.Fe3O4 nanoparticles were spheres partly with mean size of 18.8 nm studied by TEM,which was consistent with the result 17.9 nm calculated by Scherrer'S equation.KH570 was adsorbed on surface and formed chemistry bond to be steric hindrance repulsion which prevented nanoparticles from reuniting.Then glycol-based Fe3O4 magnetic liquids dispersed stably was gained.     

基于纳米钯和Nafion膜修饰玻碳电极的甲醛传感器研究

采用循环伏安法制备了钯纳米粒子-Nafion修饰玻碳电极(Pd/Nf/GCE)的甲醛电化学传感器,并采用循环伏安法(CV)和微分脉冲伏安法(DPV)研究了甲醛在该修饰电极上的电催化氧化作用.对修饰电极制备条件和实验条件进行了优化,在此基础上建立了一种测定甲醛的伏安分析方法.实验结果表明,甲醛在该传感器上的催化氧化作用显著;在0.1 mol/L NaOH溶液中,甲醛的氧化峰电流与其浓度在5.0μmol/L~5.0 mmol/L呈良好的线性关系,线性回归方程为:ip=7.69+2.22×104c,相关系数γ=0.996 7,检测限为1.0μmol/L,具有良好的重现性和回收率.     

碳纳米管负载纳米硫化锌的制备与表征

利用微波辅助加热法,将表面功能化的多壁碳纳米管分散在乙二醇溶液中,并使醋酸锌与硫化钠在此溶液中反应,生成的纳米硫化锌粒子原位生长在碳纳米管的表面。生成的纳米硫化锌粒子密集分散在碳纳米管表面,粒子平均直径大约为1 nm。所生成的碳纳米管负载纳米硫化锌通过电子显微镜、X射线衍射分析,发现溶液中的碳纳米管不仅起到了负载基体的作用,而且在反应中改变了硫化锌的晶体结构。     

SnO2-CuO/graphene nanocomposites for high performance Li-ion battery anodes

The nanocomposites of SnO2-CuO/graphene are synthesized via a two-step method.CuO nanorods are firstly uniformly loaded on the graphene nanosheets,and then SnO2 nanoparticles are coated on CuO nanorods.SnO2-CuO/graphene nanocomposites exhibit high cyclability and capacity as anode of Li-ion battery.After 30 cycles,the capacity can maintain at 584 mAh g-1 at0.1C rate(10 h per half cycle).The high performance can be ascribed to the synergistic effect among SnO2 nanoparticles,CuO nanorods and graphene nanosheets.The results manifest that the nanocomposites of SnO2-CuO/graphene are very suitable for Li-ion battery anodes.     

复合Fe3O4磁性纳米粒子的制备及在环境领域的应用研究进展

介绍了Fe3O4磁性纳米粒子主要的液相合成制备方法,并对比了各方法的优缺点.概述了将无机、有机或生物大分子等材料包覆到纳米粒子表面的多种表面修饰方法.重点介绍了复合Fe3O4磁性纳米粒子作为固相萃取吸附剂在富集环境中的有机物方面的应用.     

功能化Fe_3O_4对水中亚甲基蓝染料的吸附性能研究

通过共沉淀法制备了磁性Fe_3O_4纳米粒子,并将其表面包覆二氧化硅外壳,制备了性质稳定,脱色性能较好,同时易于固液分离的功能化磁性纳米粒子.以模拟印染废水的脱色为目标,研究了pH、温度、吸附时间等因素对脱色效果的影响.研究结果表明,磁性吸附剂制备成本低,对亚甲基蓝溶液的脱色效率显著.     

Surface organic modification of Fe<Subscript>3</Subscript>O<Subscript>4</Subscript> magnetic nanoparticles

The surface organic modification of Fe3O4 nanoparticles with silane coupling reagent KH570 was studied. The modified and unmodified nanoparticles were characterized by FT-IR, XPS and TEM. The spectra of FT-IR and XPS revealed that KH570 was coated onto the surface of Fe3O4 nanoparticles to get Fe-O- Si bond and an organic coating layer also was formed. Fe3O4 nanoparticles were spheres partly with mean size of 18,8 nm studied by TEM, which was consistent with the result 17.9 nm calculated by Scherrer＇s equation. KH570 was adsorbed on surface and formed chemistry bond to be steric hindrance repulsion which prevented nanoparticles from reuniting. Then glycol-based Fe3O4 magnetic liquids dispersed stably was gained.