电子束蒸发沉积重掺硅薄膜及其在低辐射玻璃上的应用

采用电子束蒸发法以普通玻璃为基板制备了重掺硅薄膜,通过SEM、EDS、透射光谱对其形貌、成分以及透射率进行了测试表征.进一步采用铝诱导低温晶化法在玻璃基板上沉积Al薄膜,对重掺硅薄膜进行铝诱导晶化.XRD测试、电学性能测试以及可见-红外光谱透射率测试结果表明,硅薄膜在温度为300℃以上出现了Si(111)的衍射峰,薄膜的导电性得到了提高,且具有较强的红外反射能力,表明在低辐射玻璃上具有一定的应用价值.同时采用电子束蒸发法制备了结构为glass/Si/Ag/Si的Ag基低辐射玻璃,通过光学性质测试和腐蚀情况观察结果表明硅薄膜具有保护低辐射薄膜的作用.     

磁控溅射法镀制红外低辐射膜的研究进展

本文介绍了采用磁控溅射法在玻璃和柔性衬底上镀制红外低辐射薄膜的研究进展.根据国内外的研究现状,对薄膜的节能原理、制备方法、膜层结构及其光学、热学性能进行了综述,较详细地论述了目前低辐射薄膜研究中较为突出的金属银氧化和介质层增透的问题.     

制备工艺参数对TiNx/Ag/TiNx低辐射膜性能的影响

采用射频磁控溅射法在玻璃基片上沉积了TiNx/Ag/TiNx低辐射膜,研究了制备工艺参数对低辐射膜光学性能的影响以及低辐射膜的耐腐蚀性能.结果表明,TiNx薄膜可对膜系起到很好的保护作用,当膜系的TiNx保护层厚度为32nm、内层TiNx膜厚为16nm(氮气流量为55sccm)、Ag层厚度为16nm时,制备的低辐射膜系具有优良的透过率、低辐射性能和耐腐蚀性能.     

柱状晶形貌TiO2膜厚对FTO/TiO2镀膜玻璃光催化活性影响

采用溶胶凝胶法,在FTO(SnO2:F)低辐射镀膜玻璃衬底上制备了柱状晶体结构的TiO2薄膜,获得双层结构FTO/TiO2镀膜玻璃样品.研究了TiO2薄膜厚度对FTO/TiO2镀膜玻璃样品的光催化活性、低辐射性能以及透光性能的影响.结果表明,FTO/TiO2镀膜玻璃样品光催化活性随着TiO2薄膜厚度的增加先升高后下降,在TiO2薄膜厚度为300 nm时光催化活性最佳;低辐射性能随着TiO2薄膜厚度的增加而下降,但TiO2薄膜厚度为300 nm时仍然具备一定的低辐射性能;透光性能与TiO2薄膜膜厚的关系不大,可见光透射比保持在72%左右;表面平均粗糙度约为1 nm,表面光滑,不易沾染油污灰尘.该镀膜玻璃在保证低辐射建筑节能和透光的前提下,兼具光催化自清洁功能,具有很好的应用前景.     

ZAO薄膜的光电特性与应用前景

综述了ZAO透明导电薄膜的光电特性及其导电机理、制备技术与研究现状,认为ZAO薄膜在平板显示、太阳能电池和低辐射器件领域具有广泛的应用前景,要达到工业应用还需对一些关键问题进行系统的研究.     

常压化学气相沉积法在玻璃上制备TiSi2薄膜的研究

高导电性TiSi2薄膜对低频电磁波有高反射率.在玻璃基片上成功制备TiSi2薄膜有望开发形成一种新型低辐射镀膜玻璃.本文结合工业在线和大面积生产的特点,以常压化学气相沉积法研究了TiSi2在玻璃基板上生长、制备及其与性能间的关系.研究发现:反应在温度低于680℃时,为反应控制;在高于680℃时,为传质控制.在700℃,Si/Ti摩尔比为3时,生成的TiSi2为低电阻的正交面心晶型(C54)TiSi2.Ti5Si3相和Si相的存在,对薄膜电阻的降低不利.TiSi2晶相含量越多,结晶越好,则电阻越小.     

TiNx/SiO2/Ag/SiO2低辐射膜耐H2S气体的腐蚀性能

为了提高玻璃片上SiO2/Ag/SiO2复合膜的耐腐蚀性能,用磁控溅射法在其上制备了TiNx薄膜.采用X射线衍射(XRD)、扫描隧道显微镜(STM)研究了TiNx薄膜的结构及表面形貌;参照GB/T 5137.3-2002电子产品硫化氢腐蚀的检验方法研究了TiNx/SiO2/Ag/SiO2低辐射膜耐H2S气体的腐蚀性能....     

掺硼金刚石薄膜二次电子发射特性的研究

掺硼金刚石薄膜具有负电子亲和势和良好的电子运输性能且容易制备,作为冷阴极材料在图像显示技术和真空技术等方面都有着巨大的应用价值,引起人们的注意.从二次电子发射的机理以及影响二次电子发射系数的因素等方面,对如何利用MPCVD法制备出高二次电子发射系数的掺硼金刚石薄膜进行了综述.论述表明通过合适的工艺条件,对薄膜表面进行适当的处理,是可以制备出高二次电子发射系数的阴极用金刚石薄膜的.     

铁电膜层制备技术研究现状

具有铁电性且厚度在数十纳米至数微米的铁电薄膜具有良好的压电性、介电性及热释电性等特性,在微电子、光电子和微电子机械系统等领域有着广阔的应用前景.随着铁电薄膜制备技术的发展,使现代微电子技术与铁电薄膜的多种功能相结合,必将开发出众多新型功能器件,促进新兴技术的发展,因此对铁电薄膜的研究已成为国内、国际上新材料研究中的一个十分活跃的领域.在铁电薄膜的许多应用中,铁电存储器尤其引人注目.如何制备性能良好的铁电薄膜,满足集成铁电器件的要求成为制约铁电薄膜应用的关键环节,薄膜制备技术的进步可以提高铁电薄膜的质量,目前人们已经能够使用多种方法制备优良的铁电薄膜.总体来说,制备铁电薄膜按其制膜机理大体上可分为化学沉积法和物理沉积法两大类.化学沉积法制备微纳铁电薄膜,通过对薄膜成分、元素掺杂及薄膜取向等方面的研究提高铁电薄膜的性能,从而制备出高质量的薄膜.物理沉积法一般是在较高的真空度下进行,采用不同的基片和调节基片的温度可制得不同取向的薄膜,甚至外延薄膜,这种方法对自发极化呈现高度各向异性的薄膜制备显得尤为重要.热喷涂方法制备厚涂层通过从元素掺杂、热处理、工艺参数优化等方面来改善铁电涂层的性能.铁电薄膜制备技术的进步可以提高薄膜的质量,而薄膜质量的提高又可以促进功能器件制备技术的进步、使用性能的提升,从而使其得到更广泛的应用.本文综述了近年来铁电薄膜制备技术及其应用研究的新进展,主要针对化学方法、物理方法及热喷涂方法制备铁电薄膜的技术难点讨论了铁电薄膜成形的物理化学机理、优缺点及其应用情况.     

溶胶-凝胶法制备低折射率SiO2薄膜的过程控制研究

纳米多孔二氧化硅薄膜具有优良的物理化学特性和广阔的应用前景.以溶胶-凝胶法制备低折射率SiO2薄膜为例,对化学法镀膜中的溶胶制备、溶胶保存、薄膜制备等3个阶段进行了研究,利用透射电镜、红外光谱仪、原子力显微镜、椭偏仪等对溶胶和薄膜的特性进行了检测,并对其制备过程进行了控制,这对制备性能良好的薄膜材料及其产业化应用具有一定的指导意义.     

Simulation of the spectra and determination of the optical constants of online low-emission glass from visible to mid-infrared region

Online low emissivity glass (Low-E glass) is a promising glass product. Simulation of the spectra and determination of the optical constants of online Low-E glass are of practical interest for many applications such as product design, adjustment of coating process and comparison of samples produced using different methods. The online Low-E glass investigated here has two layers of films on 6 mm thick float glass substrate, which include the functional layer (the upper layer) and the transition layer (the lower layer). In this paper, the relation between transmittance and the parameters used in the model in the visible and near-infrared region was derived, so was the relation between reflectance and the parameters used in the model in the infrared region. The parameters used in the model were obtained by fitting the measured and simulated spectra. From the obtained parameters, the optical constants of the functional layer of online Low-E glass in the visible region and the infrared region were obtained, respectively. The sheet resistance and the infrared reflectance of Low-E glass were also calculated from the obtained fitting parameters. The simulated results are well consistent with the experimental ones.     

溶胶－凝胶二氧化硅驻极体薄膜的物理化学改性

实验研究了由溶胶－凝胶法制备二氧化硅驻极体薄膜的工艺。用红外透射谱、扫描电子显微镜以及驻极体等温表面电位测量和热刺激放电等实验考察了热处理和化学表面修正两个关键工艺对溶胶－凝胶二氧化硅样品驻极体性能的影响。结果表明经过高温条件下一定时间的热处理和化学表面修正，可以制备出性能优良的驻极体薄膜     

Development and characterization of a mucoadhesive sublingual formulation for pain control: extemporaneous oxycodone films in personalized therapy

Objective: The aim of this work was the development of mucoadhesive sublingual films, prepared using a casting method, for the administration of oxycodone.

Materials and methods: A solvent casting method was employed to prepare the mucoadhesive films. A calibrated pipette was used to deposit single aliquots of different polymeric solutions on a polystyrene plate lid. Among the various tested polymers, hydroxypropylcellulose at low and medium molecular weight (HPC) and pectin at two different degrees of esterification (PC) were chosen for preparing solutions with good casting properties, capable of producing films suitable for mucosal application.

Results and discussion: The obtained films showed excellent drug content uniformity and stability and rapid drug release, which, at 8?min, ranged from 60% to 80%. All films presented satisfactory mucoadhesive and mechanical properties, also confirmed by a test on healthy volunteers, who did not experience irritation or mucosa damages. Pectin films based on pectin at lower degrees of esterification have been further evaluated to study the influence of two different amounts of drug on the physicochemical properties of the formulation. A slight reduction in elasticity has been observed in films containing a higher drug dose; nevertheless, the formulation maintained satisfactory flexibility and resistance to elongation.

Conclusions: HPC and PC sublingual films, obtained by a simple casting method, could be proposed to realize personalized hospital pharmacy preparations on a small scale.     

MgO二次电子发射功能薄膜的制备方法

综述了具有二次电子发射功能的MgO薄膜的主要制备方法,包括电子束蒸发、磁控溅射、溶胶一凝胶、分子柬外延和脉冲激光沉积法。阐述了各种方法在制备MgO薄膜方面的优点和不足,讨论了不同的制备方法对MgO薄膜结晶取向、表面形貌等性质的影响。分析表明,利用磁控溅射法制备MgO薄膜可获得较高的二次电子发射率。     

利用LiCl/DMAc技术制备纤维素包装膜的研究

主要研究以木浆为原料,以LiCl/DMAc为溶剂,制备可降解纤维素包装膜的技术与方法.通过改变浆粕浓度、凝固浴温度和浓度,可制备不同力学性能的纤维素包装膜.结果表明:纤维素浓度在7%时成膜性能最好;随着凝固浴浓度的增加,膜的力学性能先上升,后下降;相对于凝固浴浓度,凝固浴温度对膜力学性能有更大影响.     

Development and mechanical characterization of solvent-cast polymeric films as potential drug delivery systems to mucosal surfaces

Solvent-cast films from three polymers, carboxymethylcellulose (CMC), sodium alginate (SA), and xanthan gum, were prepared by drying the polymeric gels in air. Three methods, (a) passive hydration, (b) vortex hydration with heating, and (c) cold hydration, were investigated to determine the most effective means of preparing gels for each of the three polymers. Different drying conditions [relative humidity – RH (6–52%) and temperature (3–45°C)] were investigated to determine the effect of drying rate on the films prepared by drying the polymeric gels. The tensile properties of the CMC films were determined by stretching dumbbell-shaped films to breaking point, using a Texture Analyser. Glycerol was used as a plasticizer, and its effects on the drying rate, physical appearance, and tensile properties of the resulting films were investigated. Vortex hydration with heating was the method of choice for preparing gels of SA and CMC, and cold hydration for xanthan gels. Drying rates increased with low glycerol content, high temperature, and low relative humidity. The residual water content of the films increased with increasing glycerol content and high relative humidity and decreased at higher temperatures. Generally, temperature affected the drying rate to a greater extent than relative humidity. Glycerol significantly affected the toughness (increased) and rigidity (decreased) of CMC films. CMC films prepared at 45°C and 6% RH produced suitable films at the fastest rate while films containing equal quantities of glycerol and CMC possessed an ideal balance between flexibility and rigidity.     

Stability and mechanical properties of electrochemically prepared conducting polypyrrole films

The stability and mechanical properties of polypyrrolep-toluene sulphonate films prepared under various preparation conditions were studied and are reported here. Relatively high retention of conductivity and flexibility properties in air at room temperature were found for the films. More stable films were produced from propylene carbonate diluent than from acetonitrile and solvent mixtures. Acid treatment caused conductivity to increase and the mechanical properties to decrease slightly. However, both properties decreased dramatically after exposure of the films to sodium hydroxide solution. The effect of solutions containing different vanadium ions was also observed, the films being stable in V³⁺ and V⁴⁺ acid solutions, but unstable in V⁵⁺ solutions. The thermal stability of polypyrrole films grown at different temperatures and from different solvents was considerably high and fairly constant. Anisotropy in the mechanical properties was also observed for the two directions (along and across) within the same plane of the film. Incorporation of the plasticizer, di-iso-butyl phthalate (DIBP) into the films improved the mechanical properties. A high extendable acrylic-polypyrrole composite film was also prepared, capable of straining over 100%.     

ZnO基紫外探测器的研究进展

ZnO是一种新型的宽带隙半导体光电材料,可用于制作高性能的紫外探测器,是未来半导体紫外探测器的发展重点.介绍了ZnO基紫外探测器常见的器件结构、探测材料的基本特性和主要制备方法,以及器件近期的研究进展,并扼要分析了其今后的发展方向.     

Determination of optical constants of functional layer of online Low-E glass based on the Drude theory

Online low emissivity glass (Low-E glass) is a promising glass product. Determination of the optical constants of the functional layer of online Low-E glass is of practical interest for many applications. In this paper, the optical property mechanism of online Low-E glass was analyzed. The expression for the relationship between transmittance and optical constants was derived on the basis of the Drude theory and the basic methods for thin film optics. Finally, the optical constants of the functional layer of online Low-E glass were obtained by fitting the measured transmission spectrum using the theoretical formula. In addition, the free-carrier concentration of the functional layer was calculated based on Burstein-Moss theory. The calculated results are consistent with the experimental results.     

电沉积法制备单金属纳米晶材料的研究进展

电化学法制备纳米材料具有晶粒组分和组织可控性强、工艺灵活、可以在常温常压下操作等优点.就不同性能和结构的单金属纳米粒子(零维)、纳米线(一维)、纳米镀层(二维)的制备方法进行了评述,并对其目前存在的问题和发展前景进行了探讨和展望.