油溶性二硫化钼纳米微粒的制备及抗磨性能

通过共沉淀法制备出Py DDP表面修饰的二硫化钼纳米微粒。采用FT-IR、TEM、元素分析对产物组成和结构进行表征,并考察了其在有机溶剂中的分散性。结果表明:所得表面修饰Mo S2纳米微粒尺寸在30nm~50nm之间,其在氯仿、丙酮和基础油中具有良好的分散性。利用四球极压抗磨试验考察了其摩擦学性能,磨损试验结果表明表面修饰的Mo S2纳米微粒具有良好的抗磨、减摩性能。     

轻稀土氟化物纳米微粒的制备及其抗磨性能评价

采用均相沉淀法在醇-水体系中制备了表面修饰轻稀土氟化物的纳米微粒,考察了其摩擦学性能。结果表明,合成产物的微粒粒径为20～30 nm,属于纳米级超微粒子;添加目标产物的润滑油的磨痕直径从0.66 mm降为0.40 mm,抗极压能力显著提高。与共沉淀法相比,均相沉淀法制备的表面修饰稀土氟化物纳米微粒不仅在有机溶剂中具有更为良好的分散性,作为润滑油抗磨添加剂,具有更加优异的减摩、抗磨性能。     

油溶性n-Cu的制备及其润滑油抗磨添加剂性能研究

用电化学法制备了油溶性纳米铜（n—Cu）颗粒,使粉末制备和表面改性同步完成,将其添加到润滑油基础油中,用四球磨损试验机考察了添加剂的摩擦性能并用金相电子显微镜、扫描电子显微镜和X射线电子能谱仪分析了钢球磨损表面形貌、化学形态和组成。结果表明：油溶性n-Cu能够显著地改善基础润滑油的摩擦性能,在添加剂含量为0．6（wt）%时,磨斑直径d（392N,30min）比基础油下降了37．5％。同时,该润滑油有好的分散稳定性能。     

纳米硫化锌的制备及其研究进展

纳米硫化锌具有许多特异的光电性能 ,对其制备方法的研究越来越引起人们的重视。详细介绍了制备纳米硫化锌颗粒的固相法、液相法、气相法等不同方法并比较了它们的优缺点 ,结合纳米硫化锌材料的实际应用选用不同的制备方法 ,必将进一步推动纳米硫化锌的开发研究     

纳米硫化锌的制备及应用研究新进展

综述了近年来纳米硫化锌的制备方法,对固相法、液相法和气相法等不同制备工艺的优劣进行了比较,并详细地介绍了纳米硫化锌的性能及其在各种领域中的应用。     

液相逆流沉淀法制备纳米硫化锌

研究了以硫化钠和氧化锌为主要原料,结合多级逆流沉淀和超声波振荡预分散制备纳米硫化锌粒子的方法。实验获得单级沉淀的适宜条件为:反应前超声波振荡氧化锌预分散时间为15 min,Na2S浓度为0.6 mol/L,反应温度为85～90℃,n(Na2S)/n(ZnO)=1.3:1,反应时间为150 min,n(NaOH)/n(ZnO)=10:1。经三级逆流沉淀所得纳米的ZnS晶型良好,晶粒尺寸约为55 nm,纯度在97%以上。     

纳米硫化锌的制备与应用研究现状

介绍了纳米硫化锌的制备方法,固相法、液相法、气相法,纳米硫化锌性能优越,用途广泛.     

利用热处理方法制备纳米硫化锌晶体

通过液相沉淀法制备出无定形硫化锌粉末,硫化锌粉末经高温热处理后制得纳米硫化锌粉状晶体。具体过程为:将硫化钠溶液缓慢加入酸性的氯化锌溶液中,沉淀、洗涤、干燥后,研磨至200目以上,并在H_2气氛保护下于400℃温度焙烧,制得20～30nm粒径的硫化锌晶体。     

均匀沉淀法制备不同粒径的纳米硫化锌

以硫代硫酸钠为硫源,采用均匀沉淀法研究了不同粒径纳米硫化锌的制备,讨论了反应温度、加热方式、反应物的浓度及物质的量比对其粒径的影响。研究结果表明：通过控制制备工艺条件,采用均匀沉淀法可以制备出平均粒径为4～24 nm、立方晶型的球形纳米硫化锌;制备工艺条件对纳米硫化锌的平均粒径有显著影响;加热方式对硫化锌的平均粒径影响较大,微波加热比水浴加热制备的硫化锌粒径小;此外,纳米硫化锌的粒径随着反应温度的增加、反应物浓度的增加、醋酸锌和硫代硫酸钠物质的量比的减小而减小。     

液相化学还原法制备油溶性纳米铜的研究

采用液相化学还原法,以硫酸铜为原料,抗坏血酸作还原剂,吐温-80作修饰剂,用正交实验方法获得了油溶性纳米铜的最佳的合成条件：抗坏血酸为3 g,吐温-80为30 mL,正丁醇为70 mL,反应温度95℃。并利用X射线衍射仪对产品进行表征测试。     

油溶性稠油裂解催化剂的制备和评价筛选

对以胜利油田孤东采油厂油样为样品制备了油溶性稠油裂解催化剂系列样品3种.通过实际裂解降粘实验以降粘率为主要标准对所制备催化剂进行了评价筛选,最终确定了适合孤东稠油样的裂解催化剂.     

Synthesis and Luminescence Properties of Core/Shell ZnS:Mn/ZnO Nanoparticles

In this paper the influence of ZnO shell thickness on the luminescence properties of Mn-doped ZnS nanoparticles is studied. Transmission electron microscopy (TEM) images showed that the average diameter of ZnS:Mn nanoparticles is around 14 nm. The formation of ZnO shells on the surface of ZnS:Mn nanoparticles was confirmed by X-ray diffraction (XRD) patterns, high-resolution TEM (HRTEM) images, and X-ray photoelectron spectroscopy (XPS) measurements. A strong increase followed by a gradual decline was observed in the room temperature photoluminescence (PL) spectra with the thickening of the ZnO shell. The photoluminescence excitation (PLE) spectra exhibited a blue shift in ZnO-coated ZnS:Mn nanoparticles compared with the uncoated ones. It is shown that the PL enhancement and the blue shift of optimum excitation wavelength are led by the ZnO-induced surface passivation and compressive stress on the ZnS:Mn cores.     

表面修饰氧化亚铅纳米颗粒的制备及其抗磨性能研究

以硬脂酸铅为单源前驱体,成功制备出硬脂酸修饰的氧化亚铅纳米颗粒,用透射电子显微镜、X-射线粉末衍射仪、红外光谱仪等仪器对其进行了结构表征,并在四球摩擦试验机上测试了其抗磨性能。结果表明:所制备的Pb2O纳米颗粒大小均匀,表面修饰层与纳米颗粒表面之间发生化学键合作用,其作为润滑油添加剂具有良好的抗磨能力。     

Effects of the Template Composition and Coating on the Photoluminescence Properties of ZnS:Mn Nanoparticles

Mn-doped ZnS nanocrystals based on low dopant concentrations (0–2%) and coated with a shell of Zn(OH)₂ have been prepared via soft template and precipitation reaction. The results indicate that the ZnS:Mn nanocrystal is cubic zinc blende structure and its diameter is 3.02 nm as demonstrated by XRD. Measured by TEM, the morphology of nanocrystals is a spherical shape, and their particle size (3–5 nm) is similar to that of XRD results. Photoluminescence spectra under ultraviolet region shows that the volume ratio of alcohol to water in the template has a great effect on the luminescence properties of ZnS:Mn particles. Compared with unpassivated ZnS:Mn nanocrystals, ZnS:Mn/Zn(OH)₂ core/shell nanocrystal exhibits much improved luminescence and higher absolute quantum efficiency. Meanwhile, we simply explore the formation mechanism of ZnS:Mn nanocrystals in alcohol and water system and analyze the reason why alcohol and water cluster structures can affect the luminescent properties of nanoparticle.     

Preparation of controlled-shape ZnS microcrystals and photocatalytic property

ZnS microcrystals with various shapes, including polyhedron, fan-shaped sheet, hexagonal rectangle and missing angle rectangle, were successfully prepared using a simple hydrothermal method by changing the experimental conditions. The as-obtained ZnS samples were characterized by X-ray diffraction, scanning electron microscopy and energy-dispersive X-ray spectroscopy. The photocatalytic activities of the ZnS microcrystals with different morphologies were investigated by degradation testing of methylene blue aqueous solution. The highest photodegradation rate of methylene blue over the polyhedron-shaped ZnS reached up to almost 100%. The photodegradation efficiencies under various conditions, including amount of catalyst, pH of aqueous solution and initial concentration of methylene blue, were studied in the presence of polyhedron-shaped ZnS. The polyhedron-shaped ZnS microcrystal can thus be utilized as a promising photocatalyst for photodegrading dyes in wastewater treatment.     

溶剂热法制备ZnS:Cu及其光学性质

采用溶剂热法,在表面活性剂十六烷三甲基溴化铵(CTAB)的作用下,制备了ZnS:Cu荧光粉体。分别考察了表面活性剂的用量、锌硫比、及Cu2+掺杂量对荧光粉晶型和发光性质的影响。通过X射线粉末衍射仪(XRD)和荧光分光光度计(PL)对合成的ZnS:Cu进行表征。结果表明,随着锌硫比的减少,衍射峰强度增大,结晶度增强,而其他条件的改变对ZnS晶型无明显影响。表面活性剂的用量、锌硫比、及Cu2+掺杂量对发光强度都有一定的影响。随着锌硫比的增大,发射峰强度有所增强且出现明显的蓝移,随着Cu2+掺杂量的增大,发光强度先增大后减小,当Cu2+掺杂量为0.2%(物质的量分数)时发光效果最好。随着表面活性剂用量的增加,发光强度先有明显的增强,随后又逐渐减弱,并且在n(Zn)∶n(CTAB)=100∶2时达到最强。     

巯基乙酸修饰ZnS纳米颗粒的水相合成及表征

以巯基乙酸(HSCH2COOH, RSH)为表面修饰剂,采用水相合成法制备了表面修饰巯基乙酸的ZnS纳米颗粒. 采用透射电子显微镜、粒度分布、X射线衍射和红外光谱等对ZnS纳米颗粒进行了表征,并对ZnS纳米粒子的制备条件进行了详细的考察. 结果表明,水相合成法的最佳制备条件为：反应pH值8.0, Zn2+:S2-:RSH(摩尔浓度比)为1:1.34:2. 在最佳条件下可制备粒径小(11 nm)且粒度分布窄、分散性好的ZnS纳米粒子,其晶体属面心立方b-闪锌矿结构.     

油溶性减阻剂的研究进展

油溶性减阻剂是一种用于油品输送的化学添加剂,可减小油品在管道中的阻力,起到节能作用。文章介绍了油溶性减阻剂的合成,重点介绍油溶性减阻剂后处理的条件、步骤,和减阻剂的几种不同后处理方法。最后介绍了减阻效果的影响因素,并简介了减阻剂的减阻机理。     

Synthesis and Sensing Properties of ZnO/ZnS Nanocages

Large-scale uniform ZnO dumbbells and ZnO/ZnS hollow nanocages were successfully synthesized via a facile hydrothermal route combined with subsequent etching treatment. The nanocages were formed through preferential dissolution of the twinned (0001) plane of ZnO dumbbells. Due to their special morphology, the hollow nanocages show better sensing properties to ethanol than ZnO dumbbells. The gain in sensitivity is attributed to both the interface between ZnO and ZnS heterostructure and their hollow architecture that promotes analyte diffusion and increases the available active surface area.