两种芳香酯的合成及其荧光特性

报道了顺丁烯二酸二间甲苯酯和邻苯二甲酸二间甲苯酯的合成与光谱性质.由顺丁烯二酸酐或邻苯二甲酸酐与间甲基苯酚在浓硫酸催化下反应得到了两种新的二元酸酚酯,通过核磁共振谱、红外光谱及质谱确定了其结构.并通过紫外可见光谱和荧光光谱比较了目标化合物的光谱性质,证实了芳香酯类化合物有较好的荧光特性.     

CdS纳米颗粒的制备及其光谱研究

采用化学合成法，以六偏磷酸钠作为稳定剂，通过控制反应物的浓度及比例，制备了不同粒径的CdS纳米颗粒，采用超高分辨电子显微镜观察了颗粒形貌，通过吸收光谱、荧光光谱研究了CdS纳米颗粒的量子尺寸效应及表面态、杂质对其光致发光性能的影响。     

苦参碱新类似物的合成和抗肿瘤活性研究

合成了一系列苦参碱分子内酰胺部分开环的新类似物.体外细胞毒性研究表明,结构中含有萘环和苯甲酰基类似物的化合物C4,与其母体化合物苦参碱及其他内酰胺开环类似物相比,具有最佳的抗增殖活性.综上,文章发现了一个潜在的抗肿瘤先导化合物C4,该化合物可用于进一步的体内外抗肿瘤研究.     

白首乌C21总甾甙对S180腹水瘤抑制作用的研究

通过口服给药法研究了白首乌C21总甾甙对S180腹水瘤的抑制作用，并与腹腔注射给药法进行了对比。实验结果表明，腹腔注射给药法能够显著延长荷S180小鼠的寿命，但口服给药法只表现出延长荷S180小鼠寿命的倾向，却没有统计学意义。     

脂肪醇聚氧乙烯醚系列磷酸酯的制备及其表面活性

以C16-18脂肪醇聚氧乙烯醚(O-3、O-5、O-7、O-10)、五氧化二磷等为原料,制备出了4种脂肪醇醚系列磷酸盐产物(O-3P、O-5P、O-7P、O-10P)等.并以体系中磷酸单酯和双酯含量为指标,探索了系列产物的制备工艺技术条件,以及研究了产物的表面活性.结果表明,最佳制备工艺技术条件是:物料配比为n(OH)∶n(P2O5)∶n(H2O)=2.5∶1∶1,醇解反应65℃和2.5h,水解反应70℃和40min.其中,O-3P磷酸酯产物中磷酸单酯率最高可达69.8%;随脂肪醇聚氧乙烯醚中EO的加合数的增加,产物中磷酸含量逐渐增多,表面活性逐步提高,产物相应临界胶束浓度值分别为:CMCO-3P值为0.094g/L,CMCO-5P值为0.088g/L,CMCO-7P值为0.072g/L,CMCO-10P值为0.069g/L.     

积雪草酸衍生物的合成及抗肿瘤活性的研究

以积雪草酸为先导化合物,对其2位、3位、12位、23位和28位进行结构修饰,设计并合成12个积雪草酸类似物.采用MTT比色法,选用人胃腺癌细胞株SGC-7901,人非小细胞肺癌细胞株A549和人成纤维肉瘤细胞株HT-1080为靶细胞,进行积雪草酸类似物体外细胞毒活性药理评价.结果表明化合物4b、6b对于SGC-7901、A549、HT-1080的抑制率明显高于对照品,值得进一步研究.     

Fabrication and characteristic detection of graphene nanoelectrodes

Graphene has the advantages of high electrical conductivity, high heat conductivity, and low noise, which makes it a potential option for integrated circuits interconnection and nanoelectrodes. In this paper, we present a novel fabrication method for graphene nanoeletrodes with nanogap. First, graphene grown by chemical vapor deposition (CVD) is assembled to a chip with microelectrodes. Second, an atomic force microscopy (AFM) based mechanical cutting method is developed to cut the graphene into nanoribbons and nanoeletrodes with nanogap. Then the electronic property of a single nanodot is characterized using the garphene nanoelectrodes, demonstrating the effectiveness of the graphene nanoelectrodes. The fabricated graphene nanoeletrode pairs can be used as probes to detect single molecule in micro-environment, and show an attractive prospect for future molecular electronics applications.     

Research on atomic states, physical properties and catalytic performance of Ru metal

Using the one-atom theory (OA) of pure metals, the atomic states of Ru metal with hcp structure, fcc structure, bcc structure and liquid state were determined as fol- lows: [Kr](4dn)3.78(4dc)2.22(5sc)1.77(5sf)0.23,Ψa(fcc-Ru)=[Kr](4dn)3.70(4dc)2.44 (5sc)1.42(5sf)0.44, Ψ a(bcc-Ru)=[Kr](4dn)4.00(4dc)2.22(5sc)1.56(5sf)0.22, Ψ a(L-Ru)=[Kr](4dn)4.00(4dc)2.00(5sc)1.52 (5sf)0.48. The potential curve and physical properties as a function of temperature for hcp-Ru such as lattice constant, cohesive energy, linear thermal expansion coeffi- cient, specific heat and Gibbs energy and so on were calculated quantitatively. The theoretical results are in excellent agreement with experimental value. The rela- tionship between the atomic states and catalytic performance was explained qualitatively and these supplied the designation of Ru metal and relative materials with theoretical instruction and complete data.     

Preparation of nano-TiO2 by liquid hydrolysis and characterization of its antibacterial activity

The nano-TiO2 particles were prepared by liquid hydrolysis method and characterized using XRD. Its antibacterial activity against two representative bacterial, Escherichia coli and Staphylococcus aureus, was also studied. The experimental results showed that the nano-TiO2 calcinated at 600-700 ℃ contained the obvious anatase phase and exerted excellent antibacterial activity. The feature of antibacterial activity of nanoTiO2 was non-strains specificity and exerted best antibacterial activity at concentration of 0.8 g/L.     

Preparation and photocatalytic activity of Gd-doped TiO2 nanofibre

In order to realize the photocatalysis of TiO2 in the sunlight and directly apply it to waste water treatment, the Gd-doped TiO2 nanofibre was synthesized using two-step synthesis method as follows： Firstly, potassium carbonate, titanium dioxide and proper gadolinium oxide （dopant） were calcined in the muffle at high temperature and the doped gadolinium K2Ti4O9 fibres were obtained; secondly, the fibre was heated using glycerol as solvent until Gd-doped TiO2 nanofibres were obtained. The synthesized samples were characterized using scanning electron microscopy, transmission electron microscopy and X-ray diffraction. The results show that Gd-doped TiO2 nanofibre heat-treated by glycerol solvent can inhibit the agglomeration, so the grain diameter of the fibre is smaller than that without heat-treated with glycerol. Meanwhile, the diameter of the fibre decreases with the increase of the heating temperature and time. 97%- 98% of Gd-doped TiO2 nanofibre is anatase. The photocatalysis results showed that the photocatalysis activity of Gd-doped TiO2 nanofibre is just a little lower than that of TiO2 powder.     

Preparation and photocatalytic activity of Gd-doped TiO_2 nanofibre

1INTRODUCTION TiO2hassomespecialpropertiesincludingphotocatalyticactivity,chemicalstability,andre sistancetowear,non poisonlowcostandcanbepreparedatlowcost.Ifmodifiedwithproperinter mingle,itcanbedirectlyusedinthesunlight.Sotitaniumdioxideisoneofthemostpotentialphoto catalyzers[1,2].Itsphotocatalyticoxidationabilityincreasesrapidlywiththedecreaseofparticledi ameter.Whenitsdiameterreaches10100nm,itwillshowobvioussurfaceeffectandquantumeffect.Moreover,itwillshowhighphotocatalyticactivityif…     

寒地大学校园环境要素与冬季体力活动相关性

为探究促进冬季体力活动的寒地大学校园环境设计依据,基于循证设计理论和社会生态学模型在中国东北地区9座大学校园年内进行了问卷调查,用实证方法探究了寒地大学校园的建成、气候及感知环境要素对学生冬季体力活动频率和水平的影响.通过描述性统计横向对比了学生冬季与非冬季月份的体力活动模式及各个校园的主观评价得分;并通过多重线性回归分析探求了校园环境要素对冬季体力活动的影响.统计结果表明:学生在冬季月份进行体力活动的频率和总量低于非冬季月份;校园冬季环境质量低于非冬季月份,且设施防寒、步行可达性、交通安全性、冬季活动安全性得分较低;在冬季,目的地多样性、公共交通选择多样性、道路交通网络连通性、步行道路环境品质、辅助设施存在性、犯罪安全性与交通性体力活动正相关,冰雪危害和空气污染与交通性体力活动负相关;校园环境与冬季休闲性活动无相关关系.利用上述数据可以初步推测促进体力活动的寒地大学校园环境设计倾向并对各个环境要素的重要程度进行评级,重要程度较高的要素是校内目的地、步行道路、犯罪安全性、步行辅助设施和校园公共交通服务.     

La掺杂混晶TiO2薄膜的制备及光催化活性

为提高TiO2的光催化降解性能,达到利用光能降解环境污染物的目的,对TiO2光催化剂进行了掺杂改性研究.通过在氟钛酸铵、硼酸混合溶液中加入硝酸镧,应用液相沉积法(LPD)制备了掺镧TiO2复合薄膜.采用XRD、UV-Vis、XPS、SEM等手段对TiO2薄膜的组成、结构和表面形貌进行了测试表征,并以甲基橙溶液的降解反应...     

新型阳离子淀粉的制备及其溶液的表面活性

阳离子淀粉在造纸及纺织工业中有广泛的用途.常用的阳离子淀粉不易制备,价格贵,有较强的亲水性而较弱的亲油性,因此影响其表面活性.采用三乙胺与环氧氯丙烷反应制备阳离子化试剂有利于解决上述问题.反应便于控制,容易合成,增强其亲油性.本文报道这种新型阳离子淀粉的制备.通过对各种影响因素的分析,确定适宜的工艺条件为：反应温度,45～50℃;反应时间,4.5h;氢氧化钠浓度,0.2mol/L;反应物料比,阳离子化剂/淀粉葡萄糖单元=0.8/1.并测定其水溶液的表面张力降至52.8mN/m,表明该产品具有良好的表面活性.     

新型阳离子淀粉的制备及其溶液的表面活性

阳离子淀粉在造纸及纺织工业中有广泛的用途。常用的阳离子淀粉不易制备,价格贵,有较强的亲水性而较弱的亲油性,因此影响其表面活性。采用三乙胺与环氧氯丙烷反应制备阳离子化试剂有利于解决上述问题。反应便于控制,容易合成,增强其亲油性。本文报道这种新型阳离子淀粉的制备。通过对各种影响因素的分析,确定适宜的工艺条件为:反应温度,45~50℃;反应时间,4.5 h;氢氧化钠浓度,0.2 mol/L;反应物料比,阳离子化剂/淀粉葡萄糖单元=0.8/1。并测定其水溶液的表面张力降至52.8mN/m,表明该产品具有良好的表面活性。     

SK-2003Z型原子荧光光度计的安装与验收

简述北京金索坤公司生产的SK-2003Z型原子荧光光度计安装条件、安装过程、操作步骤以及如何验收仪器指标.     

Preparation and characteristic of self-regulation water-transmitting coating fiber

Common clay, Kaolin and Bentonite were used as additives to prepare water-transmitting coating fiber, respectively, and the water-transmitting characteristic of coating fiber was studied. Different water-transmitting coating fibers were prepared by coating fiber using coating material with different mass proportions of additives to adhesive. And the coating materials were made from three kinds of inorganic clays as additives respectively and polyvinyl alcohol (PVA) as adhesive. Furthermore, the surface morphology and water-transmitting capacity of coating fiber were studied by SEM, Perkin Elmer Diamond S II thermal multi-analyzer and instrument for quick measurement moisture M30. The experimental results indicate that water-transmitting coating fibers made from three kinds of clays all have water-transmitting capacity. The surface of water-transmitting coating fiber prepared by common clay T is continuous and compact, and the water-transmitting effect is better than coating fibers made from other clays. Funded by the National High Technology Research and Development Program of China (2001AA322100), the Ministry of Education of Republic of China (106086), and the Cooperation and Merger Found of Beijing (ZH114140537)     

一种新型荧光聚氨酯的制备与研究

荧光聚氨酯在荧光聚合物研究领域中近年受到越来越多的关注,为了制备一种具有多功能的荧光聚氨酯,以1,5–二羟基萘为荧光功能单体,合成了一种新型的具有固态和酸碱响应荧光发射的多功能聚氨酯(MFU).采用核磁共振(1H NMR)、红外光谱(FTIR)、紫外–可见光谱(UV–vis)对其进行了结构表征,分别用溶液样品和固态薄膜...     

均质汽-液成核机理及特性研究进展

介绍了纯流体汽-液成核质实验测定、计算机模拟和理论模型三方面的进展,对经典成核理论和密度泛函理论进行了总结。分析了密度泛函理论研究纯流体汽—液成核性质的发展方向。     

Preparation of amorphous nano-boron powder with high activity by combustion synthesis简

The preparation process of amorphous nanometer boron powders through combustion synthesis was investigated, and the effects of the reactant ratio, the heating agent and the milling rate on the activity and particle size of amorphous boron powders were studied. The results show that the boron powders exist in the form of an amorphous phase which has the crystallinity lower than 30.4%, and the panicle size of boron powder decreases with an increase of the high-energy ball milling rate. The purity of amorphous boron powder is 94.8% and panicle sizes are much smaller than 100 nm when the mass ratio of B2O3/Mg/KClO3 is 100：105：17 and the ball milling time is 20 min with the milling rate of 300 r/min. At the same time, the amorphous boron nano-fibers appear in the boron powders.