水溶性金属卟啉与DNA相互作用的微量热法研究

叶琳化合物以其对肿瘤组织的特殊亲和性和光动力学效应受到广泛的重视，国内外研究报导甚多·自D79年nel等人山证实水溶性四一K甲基毗陡基）叶咐及其金属配合物能嵌入＊＊A的碱基之间后，人们以这类水溶性叶琳为模型利用各种物理和化学手段研究它们与＊NA相互作用［2，3］．但用微量热法进行研究尚未见报导．我们曾报导用共振拉曼光谱研究图1所示的二个水溶性金属叶琳ru（＊A仰）」和卜i（N＊＊刊I同＊＊A的作用＊‘］，本文进一步报导用微量热法和紫外可见光谱研究的结果．1实验部分1．1试剂将小牛胸腺DN以华美生物工程公司产品）直接…     

AB5型贮氢合金电极的性能

在金属氢化物一镍电池（MH／Ni）负极材料中，ABS型贮氢合金是非常具有吸引力的一种，以AB。型贮氢合金作为负极材料的MH／Ni电池目前已大批量进入市场．其中A代表混合稀土RE（主要成分为La，Ce，Pr，Nd）；B代表Ni和Co，Mll，AI等取代元素．B侧取代元素已被广泛研究D，习，A侧混合稀土的成分也已引起人们的广泛重视＊‘，’］，＊血1c等【阿针对儿一N13。5C00．75Mll。。A10．3，详细研究了L31。CI。BS系列合金，得出在。＝0．2处合金具有较好的综合性能．本文针对B侧Ni。。。Coo，。Mno、。Alo二。（记为民）成分，在研…     

硫脲与多种阴离子共吸附行为的拉曼光谱研究

在电化学的研究与应用中，因硫豚（1’川可用作电镀添加剂、金属的缓蚀剂和一些电极反应的催化剂［‘］而受到人们的广泛重视．早在三十年代初就开展了有关水溶液和非水溶液体系中硫豚在不同金属电极表面的吸附行为的研究【’，’］、随着光谱电化学技术的建立、发展和不断完善     

酞菁染料的金属化和溴化与光物理影响的研究

以α位(2,4-二特戊基)苯氧基邻苯二腈作为环合前体,制备了多种金属酞菁,产物经元素分析、紫外、红外、核磁氢谱等分析手段进行表征.并选择了部分酞菁进行溴化,其中着重研究了不同中心金属以及溴化对染料Q带吸收的影响.结果表明,酞菁染料的金属化对于其Q带吸收影响很大,多数染料金属化后会出现蓝移,而选择合适的条件进行溴化,可以使得金属酞菁的Q带吸收出现一定程度的红移,其中部分溴化金属酞菁的吸收波长与光信息产业中使用的近红外激光器很接近,具有潜在的实用价值.     

O／W微乳液中聚邻甲苯胺超微粒子的制备

聚邻甲苯胺具有较高的电导率、较好的贮存电荷的能力和良好的环境稳定性，因而具有较大的应用价值［’－‘j，其合成方法主要有电化学合成法和化学合成法［‘·’J．化学会成法所得聚邻甲苯肢的粒子一般大于100urn．近年来，以表面活性剂聚集体微乳液、溶致液晶为介质，制备超微粒子材料已为人们所关注「’－’］．以微乳液为介质进行聚合反应亦引起重视，但大部分微乳液聚合都是在四组分微乳液（表面活性剂、助表面活性剂、单体和水）中进行‘”·“‘．近年来，某些油溶性单体已成功地在无助表面活性剂的三组分微乳液中聚合［‘’·‘’1…     

具有高表面反射性和导电性的聚酰亚胺-银复合薄膜的制备

聚酰亚胺-银的复合薄膜以其表面银层无与伦比的反射性和电导率,再加上聚酰亚胺基体本身优异的热稳定性和物理机械性能,以及其轻质和柔性的特点,在航空航天和微电子等许多领域具有广阔的应用前景,成为近年来广泛研究的多功能材料之一。本文对比了当前用于制备表面金属化的聚酰亚胺薄膜的各种方法及其优缺点,包括外部沉降法、超临界流体法、原位一步自金属化法、表面改性离子交换自金属化法和直接离子交换自金属化法,特别总结了由本课题组近年来所发展起来的表面改性离子交换自金属化法和直接离子交换自金属化法在制备高反射高导电的双面银化的聚酰亚胺薄膜方面所取得的研究进展。这两种方法均基于简单的银盐化合物前驱体即可实现双面高反射高导电的表面银化的聚酰亚胺薄膜的制备,过程简单,成本低廉。所制得的聚酰亚胺-银复合薄膜的表面反射率超过100%,表面电阻接近纯金属银的水平;复合薄膜的表面银层与聚合物基体之间有很优异的粘结性能;且很好地保持了母体聚酰亚胺薄膜优异的机械性能和热性能。其中采用直接离子交换自金属化技术,仅需将聚酰亚胺的预聚体薄膜在极稀的银盐水溶液中(0.01M银氨溶液)处理5min,然后热处理即可实现聚酰亚胺薄膜的双面金属化,是目前效率最高和银利用率最高的方法。     

金纳米粒子通过形成Au-S键的组装

利用湿化学法以纳米粒子为基本单元构筑各种纳米复合结构,具有灵活简便、通用性强等特点,近年来受到了广泛的重视．Ｎａｔａｎ［１-４］等最先开展了在固体表面上制备金纳米粒子单层膜的研究,他们借助双官能团硅烷化试剂对硅氧化物基底（如玻璃、石英等）进行表面修饰?..     

硫酸溶液中铅阳极膜研究的几个问题（三）

硫酸溶液中铅阳极膜研究的几个问题（三）①柳厚田＊王群洲周伟舫（复旦大学化学系上海２００４３３）蔡文斌（固体表面物理化学国家重点实验室厦门大学化系系厦门３６１００５）１阳极硫酸铅膜阴极还原为金属铅的液膜机理［１］奇怪的是，对铅蓄电池充电时的基本过程的机...     

二氧化硅悬浮体的絮凝

微细颗粒的胶体二氧化硅广泛应用于橡胶工业、日用化学工业、无机材料工业等众多部门,它的专门用途不下千余种[1]．二氧化硅微细悬浮体是一种典型胶体分散体系,在其中加入大分子显的有机或无机絮凝剂,研究其絮凝规律,不但对研究絮凝现象的理论和实践有意义,而且有助于认识二氧化硅颗粒的表面性质和该分散体系的稳定性．1实验1·1材料和试剂二氧化硅（上海电化厂）：以燃烧法制得的）“品（白炭黑）,D＊T法测其比表面为7（）11。’·g‘．聚丙烯酸胺（＊＊M．广州南中塑料厂）：白色粉末状,用乙醇从水溶液中沉淀、提纯,粘度法测其…     

聚合物表面金属化修饰研究进展

聚合物表面的金属化修饰是一项应用十分广泛的技术,其在保持了聚合物材料质轻易加工特点的同时赋予制品表面美观、耐磨、机械强度高、电学、热学等新的特点,已成为聚合物表面精细化加工的重要手段。经过表面金属化修饰的聚合物材料,具有极高的应用价值和广阔的市场前景,在生产和生活的各个领域都发挥着重要的作用,近年来发展很快。本文从聚合物表面金属化的工艺方法、表征手段和金属化后的作用三个方面对聚合物表面金属化修饰的研究进展进行了综述。     

Influence of temperature on the surface property of ABS resin in KMnO4 etching solution

The KMnO₄-H₃PO₄-H₂SO₄ system was used to roughen and hydrophilically modify on the surface of ABS resin at different etching temperatures, and then, electroless nickel plating process was carried out. The surface of ABS resin after etching was characterized by XPS and SEM. It is found that the surface etching effect of ABS resin is relatively good when the etching temperature is 65°C. The resin surface generates ─OH and ─COOH hydrophilic groups, the roughness of resin surface is increased significantly, and the surface hydrophilic contact angle is 40.51°. After electroless nickel plating on the ABS etching surface, the bonding force of the coating can reach 2.73 MPa. Electrochemical polarization curves and electrochemical impedance spectra also show that the corrosion resistance of coating after 65°C etching postprocessing is improved.     

去钴深度的测定及其对硬质合金性能的影响

研究了原子吸收光谱法和辉光放电光谱仪定量测定硬质合金去钴深度的新技术。实验得到了腐蚀时间与硬质合金去钴深度、表面显微硬度的关系曲线,分析了去钴深度对硬质合金表面形貌的影响。     

纳米级金红石型二氧化钛与受阻胺光稳定剂协同改进ABS的抗老化性能研究

分别采用纳米级金红石型TiO2和受阻胺光稳定剂(HALS)对ABS进行改性,通过熔融共混法制备了ABS/纳米TiO2、ABS/纳米TiO2/HALS和ABS/HALS复合材料,采用GB/T16422.2~1999所述的塑料实验室光源暴露实验方法,用氙灯气候试验机对其进行28天人工加速老化,通过测定其老化过程中的无缺口和缺口试样冲击强度的变化来对其抗老化性能进行表征,同时利用光学显微镜和扫描电镜对其老化过程中的冲击断口形貌变化进行了研究.结果表明,纳米TiO2在ABS基体中分散良好,改性后的复合材料均具有较好的抗老化性能,纳米TiO2与HALS复合改性ABS对其耐候性的提高具有明显的协同作用,其老化后的抗冲击性能超过了单一使用HALS或纳米TiO2的改性效果,老化28天后纯ABS树脂试样的无缺口冲击强度保持率只有20%左右,添加2.0 wt%纳米TiO2后,老化28天后的ABS/纳米TiO2/HALS复合材料试样的保持率则提高到47.9%,为纯ABS树脂试样的2.5倍.     

Kinetic features of plasma etching of polycarbonate in oxygen plasma

Changes in surface properties and composition of the surface layer of polycarbonate of the Lexan LS2 and Lexan 8010 brands after treatment in the positive column of glow-discharge oxygen plasma have been studied. The amount of the polymer loaded for processing has been shown to affect the kinetics of etching and modifying the polycarbonate surface. It has been found that an increase in the amount of the polymer in the plasma reduces its etching rate and also affects the electrical parameters of plasma, which in turn can cause a change in the flux of active species onto the polymer surface and, consequently, a change in the rate of plasma-initiated heterogeneous processes.     

电化学微/纳加工分辨率的影响因素及对策

The etching resolution of electrochemical fabrication technique is influenced significantly by the diffusion layer of the etchant. It has been shown that a fast etching rate can achieve higher etching resolution due to so-called heterogeneous scavenging effect, while a lower etching rate will result in rather lower etching resolution. For the latter case, the confined etchant layer technique(CELT) has been employed to improve the etching resolution. i. e., a certain redox couple which can consume the etchant homogeneously and rapidly was added to the solution. The homogeneous scavenging effect confined the etchant within a narrow layer around the electrode surface and much improved etching resolution was achieved. Using the CELT and a needle-shaped microelectrode, an etching spot of several micro-meters was obtained at silicon wafer surface.     

THE POTENCY OF SENSITIZED PHOTOHEMOLYSIS DEPENDS ON THE COMPOSITION OF THE REACTION VESSEL

Abstract— Delayed photohemolysis has been shown to vary with the composition of the reaction vessel. Human erythrocytes were illuminated in the presence of sensitizer for 1 h and examined 23 h later for percent hemolysis. Four sensitizers, two cationic and two anionic, and three types of reaction vessel were studied. The cationic sensitizers were much more effective in tissue culture treated plastic than in neutral plastic or glass. All were somewhat more effective in neutral plastic than glass. Sorption of sensitizers to reaction vessels without cells present was also studied. In some cases sorption leads to virtually complete removal of sensitizer from the reaction medium. In other cases no sorption is detectable. For the highest sorbing sensitizer total replacement of the reaction medium with sensitizer-free solution did not decrease effectiveness, demonstrating that sorbed sensitizer is available to sensitize. The results suggest that photooxidation of the cell membrane occurs in two zones, one at the interface between vessel surface and cell surface, and the other where the membrane faces the bulk reaction medium. The relative importance of the interface may depend on the strength of sorption and the affinity of sensitizer for the cell membrane.     

Some investigations into the coating of glass open-tube columns

Summary The etching of soda glass by hydrogen chloride has been studied by determining the weight of sodium chloride per unit area on single and double statically-etched glass. The influence of three coating solvents on the critical surface tension of etched and unetched glass has been determined by measuring the contact angles of a wide range of stationary phases. The dynamic coating procedure has been critically examined and certain aspects which lead to the production of improved columns are explored.     

微波消解电感耦合等离子体发射光谱法测定塑料中铅和镉

采用微波消解技术溶样，ICP-AES法测定了塑料中的铅和镉。通过对消解试剂和微波温度程序的研究，建立了塑料样品的微波消解方法。该方法与传统马弗炉高温灰化消解方法比较，具有准确、简便、快速、省试剂、污染少、消解完全等优点。方法回收率为93％～106％，相对标准偏差(n=7)均小于2％。实际样品对比分析结果表明，方法具有良好的准确度，适于多种塑料材料中铅和镉的快速分析。     

Optimization of permanganic etching of polyethylenes for scanning electron microscopy

The permanganic etching technique has been studied as a function of time, temperature, and concentration for a series of polyethylenes. Kinetic studies show that a film of reaction products builds up on the surface, impeding further etching, an effect which is greatest for the lowest-crystallinity polymers. SEM studies combined with EDS show that the film contains sulfur, potassium, and some manganese. An artifact is produced by the etching process which is impossible to remove by washing procedures if certain limits of time, temperature, and concentration are exceeded. For lower-crystallinity polyethylenes multiple etching and washing steps were required for optimal resolution. Plastic deformation during specimen preparation, whether from scratches or freeze fracturing, enhances artifact formation. When appropriate procedures are used virtually artifact-free surfaces can be produced allowing a combination of permanganic etching and scanning electron microscopy to give a rapid method for detailed morphological characterization of bulk specimens.     

THE EFFECT OF BLENDING SEQUENCE ON PHASE MORPHOLOGY OF NYLON 6/ABS/SMA BLENDS

The preparation process-dependent phase morphology of blends composed of nylon 6 and acrylonitrile-butadiene- styrene(ABS)over a composition range of 30-70 wt% using a styrene-maleic anhydride(SMA)copolymer as the compatibilizing agent with a constant content(5phr)was investigated.The results of the scanning electron microscope (SEM)observation revealed that compared with the binary blends of nylon 6 and ABS,the existence of SMA caused a composition shift of phase inversion to a higher weight fraction of...