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SURFACE CAPPING OF TiO2 COLLOIDAL NANOPARTICLES STUDIED BY FOURIER TRANSFORM RAMAN SPECTRA 下载免费PDF全文
Surface capping of TiO2 colloid nanoparticles with tetrasulfonated gallium phthalocyanine chloride (GaTsPc) was studied by Fourier Transform (FT) Raman spectra. A striking FT-Raman signal enhancement of GaTsPc is observed, indicating that a surface complex is formed during surface capping of GaTsPc dye molecules on TiO2 colloid via sulfonate groups. This effect is attributed to a strong Raman resonance with the charge transfer transition in the surface complex. Surface complexation also have considerable influences on the FT-Raman signals for TiO2 nanoparticles. 相似文献
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PREPARATION OF STRIPE-SHAPED DOMAIN STRUCTURE IN FERROELECTRIC LIQUID CRYSTAL AND THE FABRICATION OF SPATIAL LIGHT MODULATOR 下载免费PDF全文
The stripe-shaped domain (SSD) structure was prepared in the initial ferroelectric liquid crystal (FLC) alignment without the application of an external electric field, which was realized by the aligning layer modification through the doping of tin tetra-2, 4-dimethyl phenoxy phthalocyanine (SnPc) into the rubbed polyimide films. Atomic force microscopy was used to investigate the alignment films and the corresponding aligning ability was evaluated through the pre-tilt angle measurement. The memory capability and the contrast ratio of thus aligned SSFLC cells have been enhanced and improved with the appearance of the SSD structure. The electrically controlled 64×64 FLC spatial light modulator was fabricated using the improved ligning method, which proves valuable for the practical device fabrication. 相似文献
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基于高效液相色谱-串联质谱(HPLC-MS/MS),开发了一种灵敏、可靠的方法,用于同时测定人类头发中的甲状腺和类固醇激素,包括甲状腺素(T4)、3,3′,5-三碘甲状腺原氨酸(T3)、3,3′,5′-三碘甲状腺原氨酸(rT3)、3,3′-二碘甲状腺原氨酸(3,3′-T2)、L-甲状腺原氨酸(T0)、皮质醇(F)和可的松(E)。头发用量20 mg,使用甲醇/氨水(体积比95∶5)在40℃下孵育24 h。采用电喷雾离子源,在多反应监测模式和正离子模式下进行定量分析。在甲醇/纯水(体积比80∶20,含0.2 mmol/L乙酸铵)的等度洗脱条件下,7种待测物分离良好。该方法检测上述7种激素的检测限在0.3~1.9 pg/mg,定量限在1.1~6.5 pg/mg;日内、日间变异系数均小于10%,回收率在89.4%~109.1%之间;稳定性、残留效应均符合检测标准要求。运用该方法检测140名被试的头发样本,所有被试的T0、F和E均可定量检测,而T4、T3、rT3和3,3′-T2的含量非常低,均在定量限附近,仅在少量被试中可被检出。 相似文献
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SECOND-ORDER NONLINEAR OPTICAL PROPERTIES OF TITANIUM DIOXIDE NANOPARTICLES AND NANOPARTICLES-DYE COMPOSITES 下载免费PDF全文
Hyper-Rayleigh Scattering (HRS) technique was used to study the second-order nonlinear optical (NLO) responses of aqueous titanium dioxide (TiO2) nanoparticles of 10nm in size, and two nanoparticles-dye composites prepared by adding rhodamine B (Rh610) or the organic tosylate salt of dimethylaminostilbazolium (DAST). Results showed that the "per particle" first hyperpolarizability β for TiO2 nanoparticles is very large, in the range of 1026 esu. With adding Rh610 and DAST, the HRS signals of the composites were further enhanced. And in TiO2/Rh610 composite the enhancement was obviously greater than that of TiO2/DAST composite. It has proved that non-centrosymmetry of the nanocrystal/solution interface contributes mainly to its large "per particle" β, overwhelming the nanocrystal core. So the interactions between nanoparticles surfaces and adsorbed dyes were very important for their second-order NLO responses. HRS technique provides a useful new NLO method to characterize the surface structures and microenvironment of nanoscale materials. 相似文献
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