核心参数
仪器种类: 显微共焦拉曼光谱
产地类别: 进口
光谱范围: 740-4000cm-1
光谱分辨率: 1cm-1
空间分辨率: 0.5微米
最低波数: 740cm-1
光谱重复性: 1%
Ekspla激光拉曼光谱CARS­的工作原理介绍
激光拉曼光谱CARS­的使用方法?
EksplaCARS­多少钱一台?
激光拉曼光谱CARS­可以检测什么?
激光拉曼光谱CARS­使用的注意事项?
EksplaCARS­的说明书有吗?
Ekspla激光拉曼光谱CARS­的操作规程有吗?
Ekspla激光拉曼光谱CARS­报价含票含运吗?
EksplaCARS­有现货吗?
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和频振动光谱学方法研究二甲基硅油Poly(dimethylsiloxane)的紫外和表面等离子体改性动力学
In numerous applications in microfluidics, cell growth, soft lithography, and molecular imprinting, the surface of poly(dimethylsiloxane) (PDMS) is modified from a hydrophobic methyl-terminated surface to a hydrophilic hydroxylterminated surface. In this study, we investigated molecular structural and orientational changes at the PDMS-air interface in response to three commonly used surface modification processes: exposure to long-wavelength ultraviolet light (UV), exposure to short-wavelength UV that generates ozone (UVO), and exposure to oxygen plasma (OP). The surfaces of two PDMS compositions (10:1 and 4:1 of base polymer/curing agent) were probed during modification, using monolayer-sensitive IR + visible sum frequency generation (SFG) vibrational spectroscopy, with two different polarization combinations. During PDMS surface modification, the peak intensities of CH3 side groups and CH2 cross-link groups decreased, while peak intensities of Si-OH groups increased. There was no significant change in the average orientation of the CH3 groups on the PDMS surface during modification. The concentration of CH3 groups on the surface decreased exponentially with time, for all three UV, UVO, and OP modification processes, with first order kinetics and time constants of approximately 160, 66, and 0.3 min, respectively. At steady state, residual CH3 groups were detected at the PDMS surface for UV and UVO treatments; however, there were negligible CH3 groups detected after OP modification.
石油/化工
2016/10/31
相位敏感振动和频发生和最大熵法的直接比较(水介质)
We present a direct comparison of phase sensitive sum-frequency generation experiments with phase reconstruction obtained by the maximum entropy method. We show that both methods lead to the same complex spectrum. Furthermore, we discuss the strengths and weaknesses of each of these methods, analyzing possible sources of experimental and analytical errors. A simulation program for maximum entropy phase reconstruction is available at: http://lbp.epfl.ch/.
石油/化工
2016/10/31
水,空气相关离子及溶质的组织:汽/液,液/固界面振动和频光谱测量
he nature of water's hydrogen-bonding network is a vital in fluence on the chemistry that occurs at interfaces, but a complete understanding of interfacial water has proven elusive. Even-order nonlinear optical spectroscopies, such as vibrational sum frequency generation (VSFG) spectroscopy and heterodyne detected phase-sensitive sum frequency generation (PS-SFG) spectroscopy, are inherently surface specific. With the advent of advances in these spectroscopic techniques, researchers can now explore many longstanding questions about the dynamics and structures present at the vaporwater and watersolid interfaces. Of special interest to the atmospheric chemistry community is the accommodation of ions and solutes by water's hydrogen-bonding network. A better understanding of how ions and solutes behave in hydrogen-bonded water has afforded a fresh perspective of aqueous aerosols, because the interactions involved therein drive phenomena such as the hydrolysis of atmospheric chemical species. In this Account, we present work from our laboratory focusing on applying VSFG and the recently developed PSSFG techniques to probe the perturbation ofwater's hydrogen-bonding network at the vaporwater interface by a variety of ions and solutes. We also present very recent results from our laboratory on the direct observation of the adsorption of ions at the waterCaF2 interface.
石油/化工
2016/10/17
用双共振和频光谱学方法探测金属/有机物界面
Recent advances in the performance of organic semiconductors such as organic light emitting diodes (OLEDs), organic field-effect transistors (OFETs), and organic solar cells have been dramatic. In particular for OLEDs, stability and durability have improved to levels that warrant their application in everyday life. In organic devices, the charge carriers, both electrons and holes, often have to be injected through organic/electrode interfaces. Therefore, an understanding of the interaction between metal electrode and organic molecules is quite important, because the electronic properties of metal/organic interface directly affect the performance of the OLEDs.
石油/化工
2016/10/17
和频振动光谱学: 胶原蛋白光学二阶非线性的分子学来源
The molecular origins of second-order nonlinear effects in type I collagen fibrils have been identified with sumfrequency generation vibrational spectroscopy. The dominant contributing molecular groups are: 1), the methylene groups associated with a Fermi resonance between the fundamental symmetric stretch and the bending overtone of methylene; and 2), the carbonyl and peptide groups associated with the amide I band. The noncentrosymmetrically aligned methylene groups are characterized by a distinctive tilt relative to the axis perpendicular to the main axis of the collagen fiber, a conformation producing a strong achiral contribution to the second-order nonlinear effect. In contrast, the stretching vibration of the carbonyl groups associated with the amide I band results in a strong chiral contribution to the optical second-order nonlinear effect. The length scale of these chiral effects ranges from the molecular to the supramolecular.
石油/化工
2016/10/17
氟化嵌段共聚物组成、溶液性质与其固化后的表面结构
采用ATRP 技术合成了不同含氟段长度的聚甲基丙烯酸甲酯-b-聚(甲基丙 烯酸-2-全氟辛基乙酯)(PMMA144-b-PFMAn)嵌段共聚物. 利用接触角、XPS、SFG、 表面张力、DLS 等技术研究了不同含氟段长度PMMA144-b-PFMAn 溶液气/液界面性 质、聚合物分子在溶液中的聚集行为与其固化后表面结构与性能. 发现含少数几个 氟化结构单元的嵌段共聚物就呈现出优异的疏水疏油性. 含氟段的增长其表面性能 反而下降. 对其表面结构进行研究发现, 含氟量的增加, 使含氟组分在表面富集程 度的增加有限, F/C 比则随深度的增加而增加. 同时全氟烷基在表面的排列有序性下 降. 当氟化结构单元的长度为10 时, 共聚物的表面层反而出现了PMMA 的链段. 原 因主要是由于含氟段的长度影响嵌段共聚物分子在溶液中的聚集结构和气/液界面 结构, 从而影响固化过程中其表面结构的形成. 结果表明, 高含氟量的聚合物不一 定具有优异的表面性能, 合适的溶液性质对含氟聚合物表面结构的形成具有重要的 影响.
石油/化工
2009/01/04
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