Self-assembled Monolayers(SAMs) of SO3H/SiO2 was prepared and deprotonation effect was used to demon-strate its quality.The experiments of pentachlorophenol(PCP) adsorption onto the suspensions of the SO3H/SiO2 SAMs gained good effects.By regulating/none regulating pH value, compare the experiments, speculate that the surface hydrogen bond adsorption reaction may be taken place in SO3H/SiO2 and PCP interfaces.
PDDA/PAA molecular deposition (MD) films have been prepared by molecular deposition technique, and then CuS nanoparticles grew in the polyelectrolyte MD films in situ. Ultraviolet visible spectroscopy, XPS and atom force distributed proportionately in films and the agglomerate of nanoparticles are inconspicuous. The radius of nanoparticles is increased obviously according the increasing synthesis time. The nanotribological behavior of this MD films have been studied by using AFM, and indicated that the MD films have good nanotribological performance.
In order to overcome the shortcomings that the carbon nanotubes activated by Fe(NO3)2、Mg(NO3)3 was heavily and unevenly distributed.Printed them on SiO2、Si and Ti with the method of screen printing.It can be seen that the carbon nanotubes synthesized on SiO2 was distributed more evenly and averted the entanglement phenomena of carbon nan-otubes, the carbon nanotubes synthesized on SiO2 were used as cathode of field emission display.The turn-on field of the cathode is about 2.2V/μm, the emitting current is 46.6μA when the electric field reaches to 3.0V/μm, and its fluctuation is less than 5%.The CNTs slurry will be expected to be used as the cathode of field emission display, highlight lamp devices and the back light source for liquid crystal display.
编者按:江雷研究员在世界上首次提出的"纳米界面材料的二元协同效应"新思想揭示了生物体表面超疏水性的机理,指导相关仿生材料的可控制备,在超双亲/超双疏功能材料的制备和性质研究等方面取得了系统的创新成果.
以γ-甲基丙烯酰氧基丙基三甲氧基硅烷(硅烷偶联剂 KH570)为改性剂,对纳米SiO2进行表面改性,并利用紫外可见分光光度计测定其在油中的稳定性,用四球试验和止推圈试验考察改性后纳米SiO2的抗磨减磨性能,结果表明,用KH570改性后的纳米SiO2在20#润滑油中有很好的分散稳定性,将其添加到润滑油中进行摩擦磨损实验,证明,摩擦系数最多可降低约45%,磨损量明显减少,并出现负磨损现象.其作为润滑油添加剂能有效提高油品的抗磨减磨性能.
采用溶胶-凝胶法在硅衬底上成功制备出厚度约200 nm的PZT薄膜,并以差热实验为基础,分别采用600℃、650℃和700℃三种退火温度,并对不同温度下的薄膜进行拉曼测试,分析三方-四方相变趋势,研究结果表明,中频区域的A1(2TO)振动模作为四方的一个标志,随着退火温度的升高强度逐渐增强,三方向四方转变;高频范围的A1(3TO)T振动模随着退火温度的升高强度也在逐渐增强,三方晶胞在减少而四方晶胞在增多,即随着退火温度的升高,三方有向四方转变的趋势.
One of the challenging a spects in designing and developing novel functional materials is to incorporate the desired optical and/or electrical properties maintaining their film-forming and thermal characteristics which make them suitable for thin film device applications.
采用均匀沉淀法在磁性NiFe2O4表面包覆TiO2,制备了一种新型纳米TiO2/NiFe2O4光催化复合材料.通过改变Ti和Ni物质量之比确定了复合材料最佳钛镍比,用X射线衍射、透射电镜、UV-vis漫反射、BET、TG-DSC、磁力学测试等手段对复合材料进行了表征,以甲基橙的水溶液为模拟污染物,评价样品的光催化性能:该复合材料在光照2h后,甲基橙的脱色率可达98.5%,是一种在可见光范围内有响应、便于回收、可重复使用的高效光催化剂.
在450℃反应温度下,利用无水三氯化铝与叠氮化钠在25mL的不锈钢反应釜中直接反应,成功地在硅片衬底上制备了六方单晶氮化铝(h-A1N)纳米线有序阵列.这些纳米线呈长直线状,粗细均匀,直径约为100nm,长度均在几个微米以上.所有纳米线生长方向一致,而且与硅片衬底垂直.经过分析.纳米线由气液固机制生长而成.
采用直流反应磁控溅射法低温沉积ITO薄膜,用XRD、SEM和UV-Vis分别表征ITO薄膜的晶体结构、表面形貌及其紫外一可见光吸收谱,研究了氧分压、溅射功率及薄膜厚度等工艺参数对薄膜光电性能的影响,结果表明,氧分压过大时,ITO薄膜中有大量的位错和缺陷,使薄膜的电阻率变大,导电性变差;氧分压过小时,薄膜中将有大量氧空位产生,导致晶格变形,使电阻率增加.随着溅射功率增大,在相同时间内薄膜厚度增加,方块电阻减小,薄膜电阻率降低.随着薄膜厚度增加,制备的薄膜晶体结构相对完整,载流子浓度和迁移率逐渐增大,薄膜电阻率变小,进而对样品的光电性能产生明显影响.
将纳米氧化锆(ZrO2)粒子添加到聚偏氟乙烯(PVDF)膜铸液中,通过相转化法制备了一系列不同ZrO2含量的ZrO2/PVDF杂化膜.通过SEM、EDX、XRD等技术对杂化膜结构进行表征,发现ZrO2粒子填充到聚合物网络结构中,使膜孔径变小,并且降低了膜的结晶度.膜超滤实验表明,随着ZrO2含量的增加,膜纯水通量先增加后减小;膜对牛血清蛋白(BSA)的截留率逐渐增加,而通量衰减有所降低,说明ZrO2的加入能够有效提高膜对BSA的抗污染性能.
The surface modification of nano-silica materials as pesticide carrier was realized with silane coupling agent KH-570 for the improvement of dispersivity and hydrophobicity. The surface modified nano-silica materials were characterized respectively by SEM, low-angle XRD, FTIR and element analysis. The result showed that KH-570 can modificate nano-silica successfully and improve its dispersivity. The optimum surface modifiction conditions: mass fraction of KH570 is 5%; coupling reaction time is 5 h. Surface grafting ratio of nano-silica with KH-570 obtained under these conditions is 11.7%.
介绍了纳米金属多层膜的微结构热稳定性的实验和相关的理论基础及模拟计算,探讨了实验及模拟的发展前景,综述了纳米金属多层膜的微结构热稳定性研究的现状和发展趋势.
Supercritical hydrolysis is a new method to produce ZnO micro-particles whose average diameter is 78 nm. The resulting samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and particle-size analyzer. Its product is the high purity ZnO which is characterized by the features of the small particle size, the well developed dispersion, and the fine concentricity. The influences of process parameters, including pressure, temperature, total flux and ratio of branch flux, on particle size were investigated at the same time. The results indicated that the particle size has a significant increasing trend with an increase in the pressure and temperature; however, it decreased with an increase in the total flux, while it decreased slightly with an increase in the ratio of branch flux.
Surface-modification includes Physical modification and chemical modification.Physical modification is that kinds of rays irradiate nanoparticles to modify and nanoparticles is encrusted with some other materials.Using coupling agent, esterification, some groups be grafted onto the surface of nanoparticles and surface active agent modified are parts of chemical modification.
文章从理论上分析熔锥光纤锥的特性,模拟了锥形光纤表面的倏逝波的特性,同时,利用熔拉法在实验室中制备较好的锥形光纤,实验表明,该加工方法得到的锥形光纤的表面光洁程度较高.
试验研究了不同电解质溶液pH值以及其离子浓度和种类对SnO2纳米晶体修饰的α-Al2O3微滤膜流动电势的影响规律,结果表明,对于NaCl溶液,膜流动电势随溶液浓度的增大而降低,其等电点在4.6左右;随着溶液的pH值由3增加到10,膜流动电势由正值逐渐变为负值,而对于FeSO4,CaSO4,Na2SO4,NaCl和CaCl2溶液,当溶液的浓度固定时,膜流动电势随溶液电导率的增加而降低.
合成出了西布曲明晶体,并确定了晶体为斜方晶系,空间群为Pbcn,晶体结构测定结果表明,西布曲明晶体具有手性反式结构.运用晶体化学和纳米科技的基本原理对西布曲明的纳米化药理进行了分析,通过对该配合物不同纳米尺度微粒的晶胞数、原子数、表面原子数及其比例的计算,分析讨论了微粒纳米尺度变化与化学活性的相关关系,为西布曲明药用原理提供了分析基础.
用月桂酸对纳米3Y-TZP粉体进行表面改性,实验结果表明,改性最佳工艺为:月硅酸用量10%、改性时间75 min、改性温度60℃.经表面改性的粉体,由引起团聚的强极性多羟基表面结构变为非极性有机表层结构,粉体间作用力减小,硬团聚消失,大幅度提高了陶瓷体的烧结性能.
