分光光度法测定饮料食品中痕量有机锗和无机锗的研究

本文研究了在溴化十六烷基三甲基铵（ＣＴＭＡＢ）抗坏血酸（Ｖｃ）存在下，苯基荧光酮（Ｐｆ）光度法测定痕量锗的最佳实验条件及配合物的组成，从而建立了测定痕是锗的新方法，其方法的灵敏度ε＝１．０３４×１０＾５Ｌ．ｍｏｌ＾－１．ｃｍ＾－１锗含量在０－１６．８μｇ／２５ｍＬ范围内符合比耳定律，稳定性好，操作简便，快速。应用本法测定了矿泉水，茉莉花茶，大蒜中有机锗和无机锗的含量，回收率在９１．６％－１０３．５     

罗丹明6G.四溴荧光素双显色体系浮选光度法测定锗的研究

向锗与茜素氨羧络合剂罗丹明６Ｇ形成的Ｇｅ（ＡＷＬＣ３（Ｒ６Ｇ）５甲苯浮选物，加入０．１ｍｏｌ／Ｌ的ＮａＯＨ的溶液，使Ｒ６ＧＹ颜色相同的四溴荧光互，形成等色染料离子对Ｒ６Ｇ＾＋；ＴＢＦ＾－再被甲苯浮选。将浮先物溶于丙酮，于５３０处进行光度测定，由于１０个染料分子同时吸光，使本方法具有很高的灵敏度：ε＝５．８×１０＾５Ｌ．ｍｏｉｌ＾－１，ｃｍ＾－１，锗含量在０．００４０－０．１ｍｇ／Ｌ服从比耳定律。     

煤矸石中铁的测定

本文研究了邻菲罗啉与铁的显色反应,试表明,在ＰＨ２－６的盐酸介质中,铁与邻菲罗啉形成红色的配合物,最大吸收波长在５１０ｎｍ处,表观吸收系数ε＝１．１２＊１０＾４Ｌ．ｍｏｌ＾－１．ｃｍ＾－１,铁量在０－８０μｇ／５０ｍＬ的范围内服从比耳定律,方法灵敏度高,方法灵敏度高,选择性好、抗干扰能力强、体系稳定。     

Dy^3＋掺杂的氟锆酸盐玻璃的光谱性质

测量了氟锆酸盐玻璃中Ｄｙ＾３＋离子的吸收光谱和荧光光谱。根据Ｄｙ＾３＋离子的吸收光谱,得到氟锆酸盐玻璃中Ｄｙ＾３＋离子的Ｊ－Ｏ参量Ω,Ω３．２９×＾２０ｃｍ＾２,Ω４＝１．５６×１０＾２０ｃｍ＾２,Ω６＝２．４８±１０＾２０ｃｍ＾２,经计算了氟锆酸盐玻璃中ｙ＾３＋离子的发射特性,计算了Ｄｙ＾３＋离子１．３μｍ发射的＾６Ｆ１１／２（６Ｈ９／２）→６Ｈ１５／２跃迁的发射截面σ＝０．６２×１０＾－２０ｃ     

电子束泵浦KrF激光放大器增益与吸收的测量

为研制百焦耳级ＫｒＦ激光放大器，发展ＭＯＰＡ系统，我们用自探测法在百焦耳级电子束泵浦ＫｒＦ激光装置上进行了激光放大器的增益与吸收的测量。泵浦率约为０．６７ＭＷ／ｃｍ￣２，激光介质为８９．６％Ａｒ：１０％Ｋｒ：０．４％Ｆ＿２的混合气体，总气压０．２５ＭＰａ，实验测得激光放大器的小信号增益系数ｇ＿０＝６．６％ｃｍ￣（－１）、非饱和吸收系数α＿ｎ＝０．９３％ｃｍ￣（－１）、饱和光强Ｉ＿ｓ＝２．５ＭＷ／ｃｍ￣２。     

电子束泵浦KrF激光放大器增益与吸收的测量

为研制百焦耳级ＫｒＦ激光放大器，发展ＭＯＰＡ系统，我们用自探测法在百焦耳级电子束泵浦ＫｒＦ激光装置上进行了激光放大器的增益与吸收的测量。泵浦率约为０．６７ＭＷ／ｃｍ￣２，激光介质为８９．６％Ａｒ：１０％Ｋｒ：０．４％Ｆ＿２的混合气体，总气压０．２５ＭＰａ，实验测得激光放大器的小信号增益系数ｇ＿０＝６．６％ｃｍ￣（－１）、非饱和吸收系数α＿ｎ＝０．９３％ｃｍ￣（－１）、饱和光强Ｉ＿ｓ＝２．５ＭＷ／ｃｍ￣２。     

乳酸亚铁中总铁的溶样及比色测定

本文研究在ＨＮＯ３－ＨＣｌ体系乳酸亚铁中的Ｆｅ＾２＋会被氧化成Ｆｅ＾３＋，用碘基水杨酸比色法就能准确测定总铁量，回收率在９８％－１００％，相对标准偏差为１．１４％，摩尔吸光系数为５．６×１０＾４Ｌ．ｍｏｌ＾－１．ｃｍ＾－１，含铁量在０－７００μｇ／１００ｍＬ范围内符合比耳定律。     

傅里叶红外光谱研究血清白蛋白构象

用傅里叶红外光谱法研究了ＢＳＡ及其水溶液的红外光谱。通过对其酰胺Ｉ带傅里叶自转积谱分析,为其及部分水溶液中的二级结构构象进行了指认。结果表明,ＢＳＡ水溶液状态与固态时的二级结构是不同的。随着溶液浓度的降低,酰胺Ｉ带二级结构峰存在明显的位移现象,即１６０９．８６ｃｍ＾－１位移到１６０８．２４ｃｍ＾－１,１６３３．８５位移到１６３８．３６ｃｍ＾－１,１６５３．６９ｃｍ＾－１位移到１６５６．１０ｃｍ＾－     

GexSi1—x／Si应变超晶格雪崩光电探测器的分析与优化设计

对ＧｅｘＳｉ１－ｘ／Ｓｉ应变超晶格雪崩光电探测器进行了分析与优化设计，优化结构为：ｉ－Ｓｉ雪崩区厚是１．８～２μｍ；ｐ－Ｓｉ区的掺杂浓度是１０＾１８ｃｍ＾－３厚为１７ｎｍ超晶格总厚为３４０ｎｍ，它可探测１．３～１．６μｍ的红外光。     

三烷基氧膦（TRPO）辐射稳定性研究：辐解损失率的测定

三烷基氧膦是用于高放废液处理的萃取剂,本文试验了在辐照剂量为１×１０＾４Ｇｙ－１×１０＾６Ｇｙ时ＴＲＰＯ损失率。结果表明,１００％（Ｖ／Ｖ）ＴＲＰＯ在λ辐照剂量１０＾４Ｇｙ－１０＾６Ｇｙ变化时,辐解损失率为１．２％－１．６％;３０％（Ｖ／Ｖ）ＴＲＰＯ－煤油在辐照剂量１０＾４Ｇｙ－１０＾５Ｇｙ时,辐解损失率基本不变（０．３３％－０．３４％）,而在１×１０＾６Ｇｙ时增加到０．７７％。均低于磷酸三丁酯的     

液相电化学法制备类金刚石薄膜及其摩擦性能研究

采用自行设计的液相法沉积装置,以甲醇有机溶剂作为碳源,利用液相电化学沉积技术在不锈钢及Si基底上制备了类金刚石薄膜;用扫描电镜、Raman光谱仪表征了沉积薄膜的表面形貌和结构;用UMT-2M摩擦磨损试验机对两种沉积薄膜进行了摩擦性能测试。结果表明:经电化学沉积的类金刚石薄膜均匀、致密,表面粗糙度小;Raman光谱在1 332cm-1处有强的谱峰,与金刚石的特征峰相吻合,其中不锈钢基底上薄膜的sp3含量更高;不锈钢基底沉积膜的摩擦系数为0.12,Si片基底沉积膜的摩擦系数为0.10;不锈钢基底沉积膜的耐磨性较Si片沉积膜高。     

含氮类金刚石薄膜的紫外辐照研究

 用射频等离子体方法在玻璃基底上制备的类金刚石（DLC）薄膜，采用离子注入法掺氮，并对掺氮DLC薄膜紫外（UV）辐照前后的性能变化进行了研究。研究结果表明：随氮离子注入剂量及UV辐照时间的增加，位于2 930cm^-1附近的SP ³C-H吸收峰明显变小，而位于1 580cm^-1附近的SP2C-H吸收峰则明显增强，薄膜的电阻率明显呈下降趋势；随UV辐照时间的增加，位于1 078cm^-1附近的Si-O-Si键数量及位于786cm^-1附近的Si-C键数量明显增加。即氮离子注入和UV辐照明显改变了DLC薄膜的结构与特性。     

The influence of gas flow rate on the structural,mechanical, optical and wettability of diamond-like carbon thin films

In this research, diamond-like carbon (DLC) thin films were deposited on silicon substrates by radio-frequency plasma enhanced chemical vapor deposition method using gas mixture of CH₄ and Ar. The effect of different CH₄/Ar gas ratio on the structure, refractive index, transmission and hardness of the DLC thin films were investigated by means of Raman spectroscopy, ellipsometry, Fourier transform Infrared Spectroscopy and nano-indentation methods, respectively. Nuclear resonant reaction analysis was used to measure the amount of hydrogen and carbon in the thin films. Furthermore, wettability of the thin films was achieved by measuring of water contact angle (WCA). The results indicated that the structural properties of the diamond-like carbon thin films are strongly dependent on the composition of gas mixture. Based on ellipsometry results, refractive index of the thin films varied in the range of 1.89–2.06 at 550 nm. FTIR results determined that deposition of DLC thin films on silicon substrate led to an increase of the light transmission in IR region and these films have the potential to be used in silicon optics as the antireflective coatings in this region. Nano-indentation analysis showed that the thin films hardness changed in the range of 7.5–11 GPa. On the other hand hydrogen content and fraction of C?H bonds in the samples increased by an increase in the gas ratio of CH₄/Ar. Also, WCA measurements indicated that WCA for thin films with gas ratio of 3/7 is the most and equal to 79°.     

Preparation and tribological properties of DLC/Ti filmby pulsed laser arc deposition

This paper reports that DLC (diamond like carbon)/Ti and DLC films were prepared by using pulsed laser arc deposition. R-ray diffraction, Auger electron spectroscopy, Raman spectroscopy, atomic force microscopy, nanoindenter, spectroscopic ellipsometer, surface profiler and micro-tribometer were employed to study the structure and tribological properties of DLC/Ti and DLC films. The results show that DLC/Ti film, with $I(D)/I(G)$ 0.28 and corresponding to 76{\%} sp$^{3}$ content calculated by Raman spectroscopy, uniform chemical composition along depth direction, 98 at{\%} content of carbon, hardness 8.2 GPa and Young's modulus 110.5 GPa, compressive stress 6.579 GPa, thickness 46~nm, coefficient of friction 0.08, and critical load 95mN, exhibits excellent mechanical and tribological properties.     

离子束流后处理对类金刚石薄膜激光损伤特性的影响

类金刚石薄膜激光损伤阈值低,已经严重制约其在红外激光系统中的应用。基于非平衡磁控溅射技术,在硅基底上沉积类金刚石薄膜;采用离子束流后处理技术,用正交实验法确定影响处理效果的主要因素,对已沉积完成的DLC薄膜进行离子束轰击;在不同处理工艺下,观测薄膜样品的光学常数及拉曼光谱,最后进行了激光损伤测试。从测试结果可知,离子束流后处理参数:离子能量1000eV、放电电流30~40mA、轰击时间8min时,透射率由原来的60.65%提高到了65.98%;消光系数在900nm后明显降低,DLC薄膜的激光损伤阈值从0.69J/cm2提高到1.01J/cm2。     

Characterization of doped diamond-like carbon films deposited by hot wire plasma sputtering of graphite

Diamond-like carbon (DLC) films doped with nitrogen and oxygen were deposited on silicon(100) and polytetrafluoroethylene (PTFE) substrates by hot wire plasma sputtering of graphite. The morphology and chemical composition of deposited films has been characterized by scanning electron microscopy, XPS, Auger, FTIR spectroscopy and micro-Raman scattering. Plasmon loss structure accompanying the XPS C 1s peak and electron energy loss spectroscopy (EELS) in reflection mode was used to study the fraction of sp³ bonded C atoms and the density of valence electrons. Raman spectra show two basic C–C bands around 1575 cm^-1 (G line) and 1360 cm^-1 (D line) . Auger depth profiling spectroscopy was used to measure the spatial distributions of C, N and O atoms in the surface layer of DLC films. The fraction of sp³ bonded atoms of about 40% was detected in DLC films by XPS plasmon loss and EELS techniques. Nitrile and iso-nitrile groups observed in FTIR spectra demonstrated the existence of sp bonded carbon in doped DLC films. The typical for DLC films specific density 1.7–1.8 g/cm³ was obtained from EELS and XPS data. PACS 52.77.Dq; 81.65.-b; 82.80.Pv     

Electrodeposition of diamond-like amorphous carbon films on aluminum from acetonitrile

Diamond-like carbon (DLC) films were electrodeposited on aluminum from acetonitrile with a pulse-modulated power at room temperature. The films were grey with 1 7m in thickness. The resistivity of the films was of the order of 10⁷ Q cm The films were characterized by X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy. XPS shows that the main composition of the films is carbon. Raman spectra indicate that typical DLC films were formed when high potential (>800 V) was applied.     

Atomic oxygen resistant behaviors of Mo/diamond-like carbon nanocomposite lubricating films

Mo doped diamond-like carbon (Mo/DLC) films were deposited on Si substrates via unbalanced magnetron sputtering of molybdenum combined with plasma chemical vapor deposition of CH₄/Ar. The microstructure of the films, characterized by transmission electron microscopy and selected area electron diffraction, was considered as a nanocomposite with nano-sized MoC particles uniformly embedded in the amorphous carbon matrix. The structure, morphology, surface composition and tribological properties of the Mo/DLC films before and after the atomic oxygen (AO) irradiation were investigated and a comparison made with the DLC films. The Mo/DLC films exhibited more excellent degradation resistant behaviors in AO environment than the DLC films, and the MoC nanoparticles were proved to play a critical role of preventing the incursion of AO and maintaining the intrinsic structure and excellent tribological properties of DLC films.     

The effect of applied negative bias voltage on the structure of Ti-doped a-C:H films deposited by FCVA

Ti-doped hydrogenated diamond-like carbon (DLC) films were deposited on Si(1 0 0) substrates by a filtered cathodic vacuum arc (FCVA) method using Ar and CH₄ as the feedstock. The composition and microstructure of the films were investigated by Raman spectroscopy, X-ray photoelectron spectroscopy and IR spectroscopy. The internal stress was determined by the radius of curvature technique. The influence of the bias voltage on the microstructure of the as-deposited films was investigated. It was found that the graphite-like bonds was dominated in the Ti-doped DLC film deposited at 0 V bias voltage. When bias voltage was increased to −150 V, more diamond-like bond were produced and the sp³ content in film reached the maximum value, after which it decreased and more graphite-like bonds feature produced with further increase of the negative bias voltage. The compressive internal in the Ti-doped DLC films also exhibited a maximum value at −150 V bias voltage. IR results indicated that CH bonded intensity reduced, and H atoms bonded with C atoms were substituted for the Ti atoms as the negative bias voltage increasing. All the composition and microstructure change can be explained by considering the plasma conditions and the effect of negative bias voltage applied to the substrate.     

Modulation of residual stress in diamond like carbon films with incorporation of nanocrystalline gold

Residual stress modulation in the diamond-like carbon coatings with incorporation of gold nanoparticles was studied critically. The films were deposited on glass and Si (1 0 0) substrates by using capacitatively coupled plasma chemical vapor deposition. Stresses in the films were determined from the broadening of the optical absorption tail and were found to decrease from 2.3 GPa to 0.48 GPa with increasing gold content (2-7 at.% Au) in the DLC matrix. Gold incorporation also made the films harder than the corresponding DLC coatings. Modulation of stress with nanocrystalline gold content in the DLC matrix was related to the relative amount of sp²/sp³ content in the DLC films.