PLGA微球中蛋白质和聚合物的相互作用

以复乳法制备rhCu，Zn—SOD的乳酸羟乙酸共聚物(PLGA)微球，载药过程中观察到乳状液的聚集、包陷，使载体和药物共包埋形成药物微球。DSC和FTIR结果显示，大部分rhCu，Zn—SOD包埋入了微球内部，内部的SOD与聚合物存在一定的相互作用，使微球的红外光谱有位移，少量SOD以疏水吸附形式存在于微球表面。     

棱镜在分光仪载物台上摆放位置的确定

讨论了在反射法测定棱镜顶角的实验中,棱镜在分光仪载物台上摆放的3个原则,提出了实验要求。     

用分光光度法研究温敏微凝胶的胶体稳定性

利用分光光度仪对加入不同浓度及不同种类电解质的同系列温敏微凝胶进行了吸光度测定 ,通过吸光度的变化值求出使胶体发生絮凝的临界电解质浓度及临界絮凝温度 ,从而判断不同胶体的稳定性大小 .     

分光计的调节方法探讨

文章从理论角度讨论了分光计实验中的几种有效调整方法。     

High-energy resolution μ-XRF analysis by position sensitive spectrometer

With a high-energy resolution micro-X-ray fluorescence (μ-XRF) analysis setup, which basically consists of an X-ray microbeam formed by an X-ray focusing lens combined with an X-ray apparatus and a wavelength dispersive position sensitive spectrometer with a flat crystal (PSS), preliminary results have been obtained. The counting rate of the analyzed element linearly increased with the power of X-ray apparatus, and the energy resolution, full width of half maximum (FWHM) of Ka lines of Ti and Cr reached 16.6 and 23.6 eV, respectively. The Cr Kb and Mn Ka lines in a sample of stainless steel could clearly be resolved. The above-mentioned results are also compared with those obtained by synchrotron radiation light microbeam combined with the PSS. The facts show that the high-energy resolution element analysis is feasible by using the setup. Moreover, problems for the setup and the ways to resolve them are discussed as well.     

Research on the Mechanism of Accelerator for Photocurable Resin in 3D Printing

The photopolymerization kinetics of cycloaliphatic epoxide and oxetane with accelerators were investigated with Real-time Fourier transform infrared spectroscopy (RT-FTIR). The consumption rates of epoxy group and oxetane group as a function of time were obtained by monitoring of the absorption peaks in the 789 cm-1 and 981 cm-1. The effect of accelerators type and the accelerating mechanism were discussed. In general, benzyl alcohol and its analogues with electron-donating substituents are useful accelerators for the cationic polymerization of cycloaliphatic epoxide and oxetane. Activated monomer mechanism and free-radical chain-induced decomposition of onium salt cationic photoinitiator account for the observed accelerating effect on the polymerization rate.     

连续Nd:YAG激光器FTIR调Q技术方案

比较了受抑全内反射棱镜和声光调制两种调Q技术的机理 ,讨论了把前者用作连续Nd :YAG激光器Q开关的可行性以及对主要的技术指标的要求     

壬基酚聚氧乙烯醚型阳离子沥青乳化剂的合成及在线红外光谱研究

以壬基酚聚氧乙烯醚(NP-10)、三乙胺和环氧氯丙烷为原料,反应合成出新型N-(3-壬基酚聚氧乙烯醚(10)-2-羟基)丙基-N,N,N-三乙基氯化铵阳离子沥青乳化剂.确定最佳反应条件为:反应时间8 h,反应温度70℃,Na OH与NP-10的摩尔比1.0,环氧氯丙烷与NP-10的摩尔比1.2,三乙胺与NP-10的摩尔比1.2.在最佳工艺条件下产物收率可达48.72%.采用红外光谱(FTIR)对产物结构进行了鉴定.采用在线红外光谱(online FTIR)手段对反应进程进行跟踪,检测出生成了中间体.基于相关实验数据,合理地提出了反应机理.产物的临界胶束浓度(CMC)为1.19×10-3mol/L,该数值较小,在CMC下的表面张力为40.13 m N/m.该乳化剂对沥青的乳化能力良好,得到的乳化沥青有良好的储存稳定性,归属于慢裂型产品.     

Texture of the nano-crystalline AlN thin films and the growth conditions in DC magnetron sputtering

DC reactive magnetron sputtering technique has been used for the preparation of Al N thin fi lms. The deposition temperature and the fl ow ratio of N2/Ar were varied and subsequent dependency of the fi lms crystallites orientation/texture has been addressed. In general, deposited fi lms were found hexagonal polycrystalline with a(002) preferred orientation. The X-ray diffraction(XRD) data revealed that the fi lm crystallinity improves,with the increase of substrate temperature from 300 ℃to 500℃. The dropped in full width half maximum(FWHM) of the XRD rocking curve value further con fi rmed it. However, increasing substrate temperature above 500 ℃or reducing the nitrogen condition(from 60 to 30% in the environment) induced the growth of crystallites with(102) and(103) orientations. The rise of rocking curve FWHM for the corresponding conditions depicted that the fi lms texture quality deteriorated. A further con fi rmation of the variation in fi lm texture/orentation with the growth conditions has been obtained from the variation in FWHM values of a dominant E1(TO) mode in the Fourier transform infrared(FTIR) spectra and the E2(high) mode in Raman spectra. We have correlated the columnar structure in AFM surface analyses with the(002) or c-axis orientation as well. Spectroscopic ellipsometry of the samples have shown a higher refractive index at 500 ℃growth temperature.