H2O／KDEHP（75%）—HDEHP（25%）／n—HEPTANE微乳体系表面活性剂？…

利用傅里叶变换拉曼光谱和傅里叶变换红外光谱对Ｈ２Ｏ／ＫＤＥＧＰ（７５％）－ＨＤＥＨＰ（２５％）／ｎ＝ＨＥＰ－ＴＡＮＥ微乳体系的表面活性剂疏水链和极性头基与水分子的相互作用进行了研究。结果表明：当加水量由Ｗ０＝１增加至４３时,表面活性有性头基［ＰＯ２］＾－的反对称伸缩振动由１２３３ｃｍ＾－１移至１２０７ｃｍ＾－１,其对称伸缩振动由１０９４ｃｍ＾－１移至１０８９ｃｍ＾－１。表面活性剂疏水链的堆结构也发     

析相光度法测定铜（Ⅱ）的研究

本文研究了Ｃｕ－ＰＥＧ－ＤＤＴＣ（铜试剂）（ＮＨ４）２ＳＯ４体系的析相光度法并应用于测定Ｃｕ。最宜酸度为３．６－９．０（ＮａＡｃ－ＨＡｃ，ＮＨ４Ｃｌ－ＮＨ３．Ｈ２Ｏ）缓冲溶液，其络合物的最大吸收位于４５０ｎｍ，表观摩尔吸光系数为９．０５×１０＾３Ｌ．ｍｏｌ＾－１．ｃｍ＾－１，Ｃｕ浓度在０－３０μｇ／Ｌ范围内服从比耳定律，铜与ＤＤＴＣ形成组成为１：２的稳定络合物。该方法用于铝合金中铜的测定，获得了满     

KH_2PO_4和（CH_3NHCH_2COOH）_3CaCl_2在高压下的状

在活塞圆筒式Ｐ～Ｖ关系测量装置上，研究了ＫＨ＿２ＰＯ＿４（ＫＤＰ）和（ＣＨ＿３ＮＨＣＨ＿２ＣＯ－ＯＨ）＿３ＣａＣＩ＿２［Ｔｒｉｓ－ｓａｒｃｏｓｉｎｅｃａｌｃｉｕｍｃｈｌｏｒｉｄｅ（ＴＳＣＣ）］在室温下、４．５ＧＰａ内的ｐ～Ｖ关系。实验结果表明：ＫＤＰ在２．１ＧＰａ左右有一个相变；ＴＳＣＣ在０．８ＧＰａ和３．２ＧＰａ左右各有一个相变。本工作还给出了它们在相变前后的状态方程，以及它们的格临爱森参数γＯ、体积模量Ｂ＿ｏ和Ｂ＿ｏ的压力导数Ｂ＿ｏ。     

G.723.1声码器的DSP16k实现

本文介绍了ＩＴＵ－ＴＧ．７２３．１语音编解码器在朗讯科技公司新一代定点数字信号处理芯片ＤＳＰ１６Ｋ上的实时实现技术。本文编程实现了Ｇ７２３．１标准的所有功能模块,包括在变码率下的静音检测（ＶＡＤ）和舒适噪声产生（ＣＮＧ）模块。本文的实现完全复合ＩＴＵ－ＴＧ．７２３．１标准的定点算法,通过了ＩＴＵ－Ｔ的所有测试矢量。同时本文比较了Ｇ．７２３．１在两种定点数字信号处理器ＤＳＰ１６ｘｘ和ＤＳＰ１６Ｋ上实     

钛酸铅薄膜拉曼散射和表面效应

研究了钛酸铅薄膜的拉曼光谱，发现了新的软模，满足居里－外斯关系，Ａ１（１ＴＯ）和Ｅ（１ＴＯ）的强度随温度增加而反常增强，ＸＲＤ和ＸＰＳ研究了晶格结构，包括晶格参量，化学计量比和氧空位。     

钛酸铅薄膜拉曼散射和表面效应(英文)

研究了钛酸铅薄膜的拉曼光谱，发现了新的软模，满足居里－外斯关系。Ａ１（１ＴＯ）和Ｅ（１ＴＯ）的强度随温度增加而反常增强。ＸＲＤ和ＸＰＳ研究了晶格结构，包括晶格参量，化学计量比和氧空位。     

MOCVD法在金属基体上制备YBCO超导带

本报道了用ＭＯＣＶＤ静态和动态沉积两种工艺制备ＹＢＣＯ超导带的实验结果。以Ｙ（ＴＭＨＤ）３、Ｂａ（ＴＭＨＤ）２和Ｃｕ（ＴＭＨＤ）２为挥发源，Ｏ２气为反应剂，高纯Ａｒ气为载流气体，在静止和以１０－１５ｃｍ／ｈ带速移动的金属银基体上，制出了有强烈ｃ－轴取向的ＹＢＣＯ超导带。静态沉积样品的Ｊｃ达到１．０４×１０＾４Ａ／ｃｍ＾２，动态沉积样品的Ｊｃ达到１．４×１０＾４Ａ／ｃｍ＾２（７８Ｋ，０Ｔ）。对改…     

四磺化酞菁钴在水溶液中二聚作用力的研究

采用发光光度法研究了四磺化酞菁钴（ＣｏＴＳＰｃ）在水、醇－水（ＭｅＯＨ、ＥｔＯＨ、ＰｒＯＨ）、胶束、微乳液、乙二胺、氨水、氰化钾的水溶液中的二聚现象，测定了ＣｏＴＳＰｃ的二聚常数ＫＤｏＴＳＰｃ与ｅｎ、ＮＨ３、ＣＮ形成配合物的稳定常数Ｋ和生成反应速率常数ｋ。     

合成抗孕酮新药RU-486中间体3,3-乙撑二氧-5α,10α及5β,10β-环氧-Δ~(9(11))-雌烯-17α(1-丙炔基)-17β-羟基的~1H和~(13)C NMR谱线全归属

用１Ｄ及２ＤＮＭＲ技术（ＣＯＳＹ，ＴＯＣＳＹ，ＨＭＱＣ及ＨＭＢＣ）归属了合成抗孕酮新药ＲＵ－４８６中间体３，３乙撑二氧５α，１０α及５β，１０β环氧－Δ９（１１），雌烯１７α（１－丙炔基）１７β羟基的１Ｈ和１３ＣＮＭＲ谱线．     

维生素B12的激光共振拉曼光谱研究

本文用激光共振拉曼光谱研究了维生素Ｂ１２位于２７０－７８０ｃｍ＾－１的低频振动光谱。认为３４４，４７６和４８８ｃｍ＾－１拉曼峰分别是腺嘌呤，Ｃｏ－ＣＮ和Ｃｏ－ＣＨ３振动模。用实验证明了维生素Ｂ１２在５１４．５ｎｍ激光作用下发生部分光解，而且Ｃｏ－ＣＨ３比Ｃｏ－ＣＮ更容易断裂。测得了光照Ｂ１２后光解速曲线。     

Folding and cracking of graphene oxide sheets upon deposition

Graphene Oxide (GO) sheets, suspended in an aqueous solution, were deposited on freshly cleaved highly oriented pyrolytic graphite (HOPG) and studied using Raman spectroscopy, atomic force microscopy (AFM) and scanning tunneling microscopy (STM). AFM phase imaging shows a distinct contrast between GO and the underlying HOPG substrate. Raman spectroscopy clearly showed the presence of GO sheets on the top of HOPG substrate. The AFM and STM images also reveal wrinkling, folding, and tearing of individual GO sheets after depositing onto an HOPG substrate. We have also observed a distinct cracking of a GO sheet after folding. We attribute this new cracking phenomenon to a weakening of C–C bonds during the oxidation of a graphene sheet.     

膨胀石墨的Raman光谱研究

以波长为514.5nm的激光对550-920℃制备的膨胀石墨进行了Raman光谱研究,结果表明:膨胀石墨的Raman光谱与高取向热解石墨基本相同,分别在~1350、~1580、~2445、~2725、~3248和~4300cm-1处出现了相应的Raman位移;其中位于~1350、~2445和~4300cm-1的Raman峰位随着制备温度的不同会发生较大的移动,而不同温度制备的膨胀石墨位于~1580、~2725、~3248cm-1处的三个Ra-man峰位基本接近;~2725 cm-1处的二阶模包含两个分别位于2707和2730cm-1处的Raman峰。膨胀石墨的D模与G模强度比ID/IG随着温度升高下降,而D线的二阶模D*峰强ID*与IG的比值ID*/IG的大体变化趋势是随着温度升高而增大。     

直流电弧等离子体射流CVD制备多种碳膜

本文报道了在同一直流电弧等离子体射流ＣＶＤ装置上，采用不同的沉积条件高速合成金刚石，类金刚石，高取向热解石墨以及无定形碳等四种碳膜。经Ｘ射线衍射（ＸＲＤ），拉曼散射谱（Ｒａｍａｎ），扫描电镜（ＳＥＭ）形貌分析以及显微硬度测试表明，该方法制得的金刚石膜和高取向热解石墨膜具有很高的纯度和良好的晶性，类金刚石具有独特的形貌和Ｒａｍａｎ散射特征以及可与金刚石膜比拟的硬度。     

Structure modification of highly ordered pyrolytic graphite by Ar plasma beam scanning at different incident angles

The surface of highly ordered pyrolytic graphite (HOPG) was modified by Ar plasma beam scanning at a controllable angle of incidence. The characteristics of plasma modified HOPG were investigated by atomic force microscope (AFM), micro-Raman, X-ray photoemission spectroscopy (XPS), and grazing incident angle of X-ray diffraction (GIAXRD). A smooth surface of HOPG can be obtained by adjusting the incident angles of Ar plasma beam scanning. The surfaces of HOPG become smoother with increasing angle of incidence after Ar plasma beam scanning. Raman spectra indicate that the plasma beam scanning breaks the hexagonal structures of sp² C=C bonds near the surface of HOPG. The broken hexagonal network structures can form C–O bonds that increase the amount of oxygen on the surface of HOPG, supported by C_1s and O_1s XPS spectra. GIAXRD data support that the co-existence of both crystalline structures of 2H and 3R in HOPG. The carbon bond breaking in 2H and 3R is different and depends on the angle of incidence. Most broken carbon bonds form damaged aromatic rings near the surface of HOPG.     

Highly oriented pyrolitic graphite anomalous structures and fullerenes self-assembly

Scanning tunneling microscopy (STM) was used to look for unusual self-structures on highly oriented pyrolitic graphite (HOPG) that can mimic fullerenes assemblies. HOPG features that may be taken as C₆₀ molecular structures were found on this surface. The HOPG self-structures have been presented earlier as anomalies of the bare HOPG surface in the literature. The experimental results are in agreement with earlier STM reports on bare and modified HOPG.     

Different angle-resolved polarization configurations of Raman spectroscopy: A case on the basal and edge plane of two-dimensional materials

Angle-resolved polarized Raman(ARPR) spectroscopy can be utilized to assign the Raman modes based on crystal symmetry and Raman selection rules and also to characterize the crystallographic orientation of anisotropic materials.However, polarized Raman measurements can be implemented by several different configurations and thus lead to different results. In this work, we systematically analyze three typical polarization configurations: 1) to change the polarization of the incident laser, 2) to rotate the sample, and 3) to set a half-wave plate in the common optical path of incident laser and scattered Raman signal to simultaneously vary their polarization directions. We provide a general approach of polarization analysis on the Raman intensity under the three polarization configurations and demonstrate that the latter two cases are equivalent to each other. Because the basal plane of highly ordered pyrolytic graphite(HOPG) exhibits isotropic feature and its edge plane is highly anisotropic, HOPG can be treated as a modelling system to study ARPR spectroscopy of twodimensional materials on their basal and edge planes. Therefore, we verify the ARPR behaviors of HOPG on its basal and edge planes at three different polarization configurations. The orientation direction of HOPG edge plane can be accurately determined by the angle-resolved polarization-dependent G mode intensity without rotating sample, which shows potential application for orientation determination of other anisotropic and vertically standing two-dimensional materials and other materials.     

爆轰合成纳米超微金刚石的Raman光谱表征

 用炸药爆轰的方法制备了纳米超微金刚石,对纳米超微金刚石进行了激光Raman光谱分析。研究发现,在1 321 cm^-1和1 600 cm^-1附近观察到了对应于sp³金刚石和sp²石墨的特征峰,金刚石的Raman峰向低波数方向移动了约10 cm^-1,其半高宽约30 cm^-1,同时在低波数方向出现尾巴,呈现非对称的Raman波谱。Raman光谱分析的结果与X射线衍射分析的结果符合。     

Double resonant raman scattering in graphite

We find that the electronic dispersion in graphite gives rise to double resonant Raman scattering for excitation energies up to 5 eV. As we show, the curious excitation-energy dependence of the graphite D mode is due to this double resonant process resolving a long-standing problem in the literature and invalidating recent attempts to explain this phenomenon. Our calculation for the D-mode frequency shift ( 60 cm(-1)/eV) agrees well with the experimental value.     

One-dimensional character of combination modes in the resonance Raman scattering of carbon nanotubes

Resonance Raman spectroscopy with an energy tunable system is used to analyze the 600-1100 cm(-1) spectral region in single-wall carbon nanotubes. Sharp peaks are associated with the combination of zone folded optic and acoustic branches from 2D graphite. These combination modes exhibit a peculiar dependence on the excitation laser energy that is explained on the basis of a highly selective resonance process that considers phonons and electrons in low dimensional materials.     

Intercalation of lithium ions into bulk and powder highly oriented pyrolytic graphite

The electrochemical reactions of highly oriented pyrolytic graphite (HOPG) bulk and powder electrodes in 1 M LiPF₆ 1:1 EC/DMC solution were investigated and the results show that the intercalation reaction of lithium ion into HOPG electrode occurs only at the edge plane and SEI formation reaction on the basal plane is negligible in comparison with that on the edge plane. The active surface area of HOPG powder electrode could be deduced by comparing the peak area (consumed charge for SEI formation) at potential of 0.5 V on voltammograms with that of bulk HOPG edge electrode. The diffusion coefficients of lithium ion in HOPG bulk layers and in HOPG powder was for the first time measured by use of electrochemical impedance spectra and potential step chronamperameter methods. It was found that the diffusion coefficients of lithium in HOPG were in the range of 10⁻¹¹-10⁻¹² cm² s⁻¹ for the lithium-HOPG intercalation compounds at potentials from 0.2 (vs. Li/Li⁺) to 0.02 V, decreasing with the increase of lithium intercalation degree. A good agreement was obtained between the results from bulk and powder HOPG electrodes by electrochemical impedance spectra method.