2,5-二疏基-1,3,4-噻二唑/聚邻甲基苯胺复合电极的电化学性能

有机二硫化合物;二疏基噻二唑;锂电池;2;5-二疏基-1;3;4-噻二唑/聚邻甲基苯胺复合电极的电化学性能     

2,5-二[2′-(4′-氯代苯氧乙酸)基]-1,3,4-噻二唑的合成

通过对称双酰肼与P_2S_5的缩合反应合成2,5-二-羟苯基-1,3,4-噻二唑,并由此制备了2,5-二[2′-(4′-氯代苯氧乙酸)基]-1,3,4-噻二唑及其相关化合物,同时测定了它们的生物活性。     

2-氨基-5-(4-吡啶基)-1, 3, 4-噻二唑Schiff碱的合成及其生物活性

2-氨基-5-(4-吡啶基)-1;3;4-噻二唑Schiff碱的合成及其生物活性;噻二唑;Schiff碱;合成;生长素;细胞分裂素     

3,6-二取代苯基-二-1,2,4-三唑并[3,4-b]-1,3,4-噻二唑衍生物的合成

以2,5-二巯基-1,3,4-噻二唑为原料, 与水合肼缩合, 生成2,5-二肼基-1,3,4-噻二唑. 2,5-二肼基-1,3,4-噻二唑与苯甲酰氯反应生成2,5-二酰肼基-1,3,4-噻二唑, 以POCl₃为环合剂环合酰肼基-1,3,4-噻二唑, 合成3,6-二取代苯基- 二-1,2,4-三唑并[3,4-b]-1,3,4-噻二唑衍生物, 合成的新化合物的结构通过元素分析、红外光谱、核磁共振氢谱和质谱予以证实, 并提出了环化反应机理.     

2-氨基-5-(2-氯吡啶-4-基)-1,3,4-噻二唑衍生物的合成及生物活性

酰胺;2-氨基-5-(2-氯吡啶-4-基)-1;3;4-噻二唑衍生物的合成及生物活性     

硒催化羰基化合成1,3,4-噻二唑-2-氨基甲酸酯

以非金属硒作为催化剂,以CO替代剧毒光气作为羰基化试剂,以O₂作为氧化剂,通过2-氨基-1,3,4-噻二唑与醇以"一锅法"方式发生硒催化氧化羰基化反应,提出了一种成本低、原子经济性高、合成路线简短及环境相对友好的合成1,3,4-噻二唑-2-氨基甲酸酯类化合物的新方法.研究了反应温度、醇的用量、压力及碱的种类等对合成1,3,4-噻二唑-2-氨基甲酸酯的影响,在优化反应条件下,2-氨基-1,3,4-噻二唑可与一系列醇顺利发生羰基化反应,以45%~90%的收率得到1,3,4-噻二唑-2-氨基甲酸酯类化合物.     

N-(1, 3, 4-噻二唑-2-基)-N′-芳酰基脲的合成及其生物活性

N-(1;3;4-噻二唑-2-基)-N′-芳酰基脲的合成及其生物活性;噻二唑;芳酰基脲;合成;生物活性;植物生长调节剂     

2,5-二苯腙基-1,3,4-噻二唑类化合物的合成及抗腐蚀性能研究

以2,5-二巯基-1,3,4-噻二唑为原料, 与水合肼反应制得2,5-二肼基-1,3,4-噻二唑, 再将其与取代苯甲醛缩合, 得到了6种新的2,5-二苯腙基-1,3,4-噻二唑类化合物, 其结构经元素分析、红外、¹H NMR及质谱等方法所证实. 6种噻二唑衍生物对喷气燃料银片腐蚀有一定的抑制作用.     

2,5-二取代芳基-1,3,4-噻二唑衍生物的微波法合成

在微波辐射下，Lawesson试剂与相应的二芳基甲酰肼反应，生成2，5-二芳基-1，3，4-噻二唑衍生物．反应时间短，产率高．所有产物结构经^1H NMR，IR，MS和元素分析确认．     

5-芳基-1,3,4-噻二唑-2-胺衍生物的合成

在冰醋酸催化下,芳香醛(2a～2g)分别和氨基硫脲(3)反应合成得到芳亚胺基硫脲衍生物(4a～4g),中间体4无需经柱层析纯化,然后在三氯化铁作用下反应关环,得到7个目标化合物5-芳基-1,3,4-噻二唑-2-胺(1a～1g).产物结构经1 H NMR、13 C NMR和ESI-MS确证.然后分别以中间体(E)-2-苄...     

液相分散法制备硬脂酸修饰铋纳米微粒

金属纳米微粒由于具有不同于普通材料的光、电、磁、热力学和化学反应等性能,在催化、信息存储、光电、微电子以及润滑等领域中有着广阔的应用前景。金属纳米微粒这些特殊的物理化学性能主要取决于制备工艺和具体的反应条件,因此研究具有特定性能的金属纳米微粒一直是纳米技术领域中的一个研究热点犤1,2犦,目前制备金属纳米微粒最常用的方法是液相法,它是通过在含有表面修饰剂的溶剂中还原相应的金属盐犤3,4犦或有机金属化合物热分解犤5,6犦来制备表面修饰的金属纳米微粒。虽然这种方法能够制备出多种具有特定性能的金属纳米微粒,但是这种方…     

WS2纳米颗粒的合成及摩擦学性能研究

将自制的WO₃纳米颗粒前驱体与S粉混合,在自制的反应装置氢气氛中,于550～750 ℃下煅烧得到二硫化钨纳米颗粒,反应中用H₂代替H₂S以减少对周围环境的污染。该合成路线简单且产物纯度高。用XRD、SEM、TEM和HRTEM对二硫化钨纳米结构进行了表征和分析,并将WS₂纳米颗粒作为添加剂添加到N40基础油中,在MS-T3000摩擦磨损仪测试其摩擦学性能。结果显示:制备的二硫化钨颗粒平均粒径在50 nm以内,其形状为球形或类球形。WS₂纳米颗粒作为普通润滑油的纳米级固体添加剂表现出了较优异的摩擦学性能。     

铅纳米微粒用作油性润滑的摩擦学性能研究

The solution dispersion method has been successfully used to prepare Pb nanoparticles in a paraffin oilpolyglycol mixed solution by directly dispersing melted Pb granules. In this solution system,paraffin oil was used as reacting media and polyglycol served as an antioxidant to protect Pb nanoparticles from oxidizing. The size and structure of the prepared Pb nanoparticles were characterized by means of the transmission electron microscopy （TEM）and powder X-ray diffraction（XRD）. Their tribological behavior was evaluated with a four-ball tester. The TEM and XRD investigations reveal that the prepared Pb nanoparticles,with the average particle diameter of 70 nm,appear to be of close spherical shape and possess the same crystal structure as the bulk Pb. The tribological results show that the Pb nanoparticles as an oil additive exhibit good friction-reduction and antiwear properties at different additive concentration and applied load. Meanwhile,they can also strikingly improve the load-carrying capacity of the base oil. The rubbed surface was also investigated by the scanning electron microscope（SEM）and energy dispersive spectroscopy（EDS）. However,there was not presence of Pb element on the worn surfaces,which indicated that no chemical reaction occurred between the Pb nanoparticles and the rubbing surfaces. In addition,the tribological mechanism of the formation of the sliding-bearing system was also proposed.     

2-硫代丁基-5-巯基-1，3，4-噻二唑Ag[I]修饰的钼硅酸盐纳米颗粒的制备及摩擦性能

以合成的2-硫代丁基-5-巯基-1，3，4-噻二唑为配体，在醇-水体系中制备了Keggin结构钼硅杂多阴离子有机衍生物的纳米颗粒，以透射电子显微镜、扫描电子显微镜、傅立叶变换红外光谱仪、热分析仪等测试手段对此纳米颗粒的形貌、组成和结构进行了表征，并在机械式四球长时抗磨损试验机上考察了其摩擦学性能．分散型实验结果表明化合物在有机溶剂中分散性能良好，红外光谱表明所合成的纳米颗粒具有杂多酸Keggin骨架结构无机核，透射电镜分析表明颗粒平均粒径约为10nm，热分析娃示分解温度范围为200～300℃．作为新型纳米润滑油添加剂，在最佳添加质量分数为0．05％，负荷300N，摩擦时间30min，转速1450r／min的条件下，与空白相比磨斑直径减小27．9％，摩擦系数减小15．3％．     

表面修饰LaF_3纳米微粒的制备及表征

在水醇混合介质中采用同阳离子共沉淀表面修饰法制备了有机化合物表面修饰的LaF3纳米微粒 ,研究了它的摩擦学特性。采用多种分析手段表征了表面修饰LaF3纳米微粒的结构 ,并在四球摩擦试验机上考察其润滑性能。结果表明 ,表面修饰LaF3纳米微粒不仅在有机溶剂中具有良好的分散性 ,同时也显示出良好的减摩、抗磨和承载性能。     

Study on the Tribological Behaviors of N,N-dioctyldithiocarbamate Monolayer-Stabilized Copper Nanoparticles in Liquid Paraffin

Copper nanoparticles surface-modified with self-assembled monolayers of N,N-dioctyldithiocarbamate (S₂CNR₂, R = n-octyl) have been prepared in the presence of cetyltrimethylammonium bromide (CTAB). The trobological behaviors of the S₂CNR₂-coated copper nanoparticles as an additive in liquid paraffin are investigated using a block-on-ring tribometer. The results indicate that copper nanoparticles as additive in liquid paraffin are capable to greatly reduce the friction coefficient and wear rate of the steels counterparts even at an extremely low concentration. The tribochemically reacted films with Cu, FeS, Fe₂O₃, and SO₄ ^2? formed during the friction process are contributed to the good tribological properties of the S₂CNR₂-coated copper nanoparticles as additive in liquid paraffin.     

表面修饰磷钼酸铵纳米微粒的合成及摩擦学行为研究

在醇-水体系中采用同阴离子共沉淀法合成了季铵盐修饰的(NH4)3PMo12O40纳米微粒,以TEM、 XRD、 FTIR、 TGA、 DSC等多种分析手段表征了这种纳米微粒的形貌和结构,在四球试验机上考察了它们的摩擦学性能.结果表明所合成的杂多化合物具有Keggin骨架结构,微粒粒径约20 nm,在有机溶剂中可良好分散,作为一类新型润滑油添加剂,具有良好的抗磨性能.     

Preparation and characterization of copper nanoparticles surface‐capped by alkanethiols

Cu nanoparticles surface‐capped by alkanethiols were synthesized using ligand exchange method in a two‐phase system. The effects of synthetic conditions, including the pH value of CuSO₄ solution, the ratio of cetyltrimethyl ammonium bromide to CuSO₄, and reaction temperature, on the size and shape of as‐synthesized Cu nanoparticles were investigated. As‐synthesized Cu nanoparticles surface‐capped by alkanethiols with different chain lengths (C_xS‐Cu) were characterized by means of X‐ray diffraction, transmission electron microscopy, Fourier transform infrared spectrometry, and ultraviolet–visible light spectrometry. The tribological behavior of C_xS‐Cu as an additive in liquid paraffin was evaluated with a four‐ball machine. Results indicate that cetyltrimethyl ammonium bromide plays an important role in controlling the dispersion of Cu nanoparticles before adding modifier octanethiol into the reaction solution. C_xS‐Cu nanoparticles as additive in liquid paraffin possess excellent antiwear and friction‐reduction performance because of the deposition of nano‐Cu with low melting point on worn steel surface leading to the formation of a self‐repairing protective layer thereon. Copyright © 2013 John Wiley & Sons, Ltd.     

Tribological properties of nanoparticle-laden ultrathin films formed by covalent molecular assembly

The tribological properties of ultrathin films containing nanoparticles encapsulated in immobilized dendrimers are investigated. The films were formed by covalent molecular assembly in supercritical carbon dioxide, and the Au nanoparticles were formed in aqueous solution. End-capping of the terminal amine groups of the dendrimer by fluorinated species resulted in a reduction in the size of the nanoparticles formed. The resulting film structure displayed a lower coefficient of friction when the nanoparticles were formed after fluorination. The observed improvement in the tribological properties is attributed to the reduction in agglomeration of the nanoparticles due to the presence of the fluorine moieties.     

聚合物纳米微球的合成及摩擦学行为

润滑油添加剂;抗磨性;缓存;聚合物纳米微球的合成及摩擦学行为