金属有机骨架材料ZIF-8富集黄芩中黄芩苷的新方法

本工作旨在探索MOFs材料高效富集黄芩中黄芩苷的新方法,拓展MOFs在吸附领域的用途.溶剂热法合成了沸石咪唑酯骨架-8（ZIF-8）,并进行了结构表征,以确保其准确合成.研究了ZIF-8对黄芩苷的吸附规律和作用机理：ZIF-8对黄芩苷的吸附符合准二级动力学方程,平衡吸附数据符合Langmuir吸附等温模型.采用响应面法（RSM）得到优化后的最佳吸附参数,在此条件下,ZIF-8对黄芩中黄芩苷的吸附率高达98.22%,且对黄芩中其它成分吸附效果不显著,以pH 6.8的PBS溶液作解吸液,ZIF-8对黄芩苷的解吸率为62.46%,而黄芩苷的纯度由吸附前的21.55%提高到解吸后的64.27%,且ZIF-8在吸附前后稳定性良好,回收率达到83.50%.因此,ZIF-8在吸附纯化黄芩苷方面具有潜在的应用价值.     

四硫富瓦烯衍生物修饰的银溶胶

四硫富瓦烯衍生物修饰的银溶胶;银溶胶;纳米粒子;四硫富瓦烯;氧化还原;表面修饰     

铁表面自组装缓蚀功能膜的电化学阻抗谱研究

在铁表面自组装十四烷基胺膜.研究该膜在0.5 mol/LH2SO4溶液中对铁的缓蚀性能.电化学阻抗谱测试表明,随着组装时间的延长,缓蚀性能也随之增强,最大缓蚀效率为68.7%.而以十二烷基硫醇和十四烷基胺修饰的混合膜则更为致密、稳定,对铁的缓蚀能力也明显优于仅以十二烷基硫醇或十四烷基胺修饰的单一膜,其缓蚀效率可提高至78.2%.     

利用光声效应研究ITO薄膜的光吸收率

利用基于压电效应的光声技术,研究了ITO薄膜在可见光波段的吸收特性,并与分光型光学薄膜分析系统NKD8000测得的数据进行了比较,得到了一致性较好的结果。实验证实:在可见光波段,该ITO薄膜的吸收率随波长呈非线性变化,在450nm附近吸收最强,随着波长的增加逐渐减小,在514.7nm处接近于零,之后又缓慢增大。     

A Study of the Relation between Current Oscillations and Pitting

Anodic polarization behaviors of iron in pure H2SO4 and three mixed acidic solutions, H2SO4 NaCl，H2SO4 NaNO3 and H2SO4 NaCl NaNO3, were investigated. The potentiodynamie sweep curves showed that the current densities rose and dropped irregularly in H2SO4 NaCl solution at the more anodic potentials since the iron surface suffered pitting attack in the solution, but the pitting corrosion was inhibited effectively in the presence of nitrate ions. The surface morphological measurements indicated that pits appeared on the iron surface in H2SO4 NaCl solution and only a few unobvious corrosion spots were observed in H2SO4 NaCl NaNO3 sointian after the iron electrode was potentiostatically polarized at 1.3 V. The oscillatory properties of iron are associated with the susceptlbility of the iron to pitting. In H2SO4 NaCl solution, the regular potentiostatic current oscillations gradually evolved into the irreg-niar current fluctuations due to occurrence of the pitting; whereas in H2SO4 NaCl NaNO3 solution, the current oscillations took place regularly, like the oscillatory behavior in the pure H2SO4 solution. Thus, when the higher the oscillatory fre-quency, the more irregular oscillatory process and the more sensitive to pitting iron occurred.     

四核Cu(Ⅰ)配合物[Cu4(imdt)9](NO3)4·6H2O的合成与晶体结构

近年来,硫脲类金属配合物在配位化学、生物化学、医药等领域的研究一直受到广泛重视[1,2]。四氢化咪唑-2-硫酮(imdt)又称乙撑硫脲,是乙撑双二硫代氨基甲酸酯类农药的代谢产物。它属于硫酰胺杂环化合物,含—N(H)—C(=S)—=—N=C(—SH)—结构互变活性基团,表现出配位多样性,与金属铜可以形成单核[3]和双核[4,5]配合物。本文合成了四核Cu(I)配合物[Cu4(imdt)9](NO3)4·6H2O,对该配合物进行了元素分析和红外光谱表征,用单晶X-射线衍射测定了晶体结构。1实验部分1·1试剂与仪器配体四氢化咪唑-2硫酮(C3H6N2S,imdt)按文献合成[6],其它药品…     

基于媒体报道下的一类SIRS传染病模型研究

本文主要研究了基于媒体报道下的一类SIRS传染病模型的持久与灭绝问题.利用一个控制疾病持久与灭绝的临界值R_0,求得了该模型存在两个平衡点:无病平衡点和地方病平衡点.结果表明当R_0≤1时,无病平衡点呈全局渐进稳定,这表示疾病是灭绝的;而当R_0 1时,地方病平衡点呈全局渐进稳定,这说明疾病是持久的.最后通过数值分析验证了该结论.     

铁表面组装磷酸三乙酯缓蚀功能分子膜的研究

研究一种新型的自组装成膜物质—磷酸三乙酯(TEP).实验发现,TEP自组装膜能有效抑制铁在0.5mol.L-1硫酸溶液中的腐蚀.电化学测试显示,组装时间对成膜效果产生影响.在最初较短的组装时间内,TEP自组装膜的缓蚀效率随组装时间延长而快速增加,之后增加速率减慢直至恒定.     

ELECTROSYNTHESES OF FREE-STANDING POLY(THIOPHENE-3-ACETIC ACID) FILM IN MIXED ELECTROLYTES OF BORON TRIFLUORIDE DIETHYL ETHERATE AND TRIFLUOROACETIC ACID

High quality free-standing poly(thiophene-3-acetic acid)(PTAA),a water-soluble polythiophene derivative,was successfully electrosynthesized in boron trifluoride diethyl etherate(BFEE)+ 25%(by volume)trifluoroacetic acid(TFA)at lower potential(0.38 V versus Pt).The carboxyl group makes PTAA highly soluble in water,facilitating its potential application as a blue-light-emitting material.PTAA films with conductivity of 7 S cm"1 obtained from this medium showed better redox activity and thermal stability.The structure and morphology of the polymer were studied by UV-Vis,FT-IR, ~1H-NMR spectra and scanning electron microscopy,respectively.     

Cu-NIC-TMED富集黄芩中黄芩苷的规律及机理

以烟酸(NIC)为配体制备了金属-有机骨架材料(MOFs)铜-烟酸-四甲基乙二胺配位聚合物(Cu-NICTMED),并将其用于黄芩中黄芩苷的吸附、分离和纯化,建立了一种无毒无害、环境友好、流程简化且效率较高的提取方法.采用溶剂热法合成Cu-NIC-TMED,然后对其进行结构表征,以实现适当的配位及准确合成.研究了Cu-NIC-TMED吸附黄芩苷的规律和机理:该吸附符合准二级动力学方程,平衡吸附数据符合Langmuir吸附等温模型.同时,通过对响应面(RSM)进行优化得到最佳吸附参数.在最佳吸附参数条件下, Cu-NIC-TMED对黄芩中黄芩苷的吸附率高达84.08%,且对黄芩中其它成分的吸附效果微乎其微.使用pH=6.8的磷酸盐缓冲溶液（PBS）作为解吸溶液, Cu-NIC-TMED解吸黄芩苷的解吸率为41.24%,黄芩苷的纯度由吸附前的21.55%提高到解吸后的75.77%, Cu-NIC-TMED在吸附前后具有良好的稳定性,回收率达到78.64%.因此, Cu-NIC-TMED在黄芩苷的吸附纯化中具有应用价值.