长链脂肪酸LB膜的X射线衍射研究

利用Langmuir-Blodgett技术制备了硬脂酸、花生酸及其混合酸的多层LB膜。用低角X射线衍射研究了它们的周期结构,硬脂酸和花生酸的LB膜在2θ=0.8°～23°的范围内分别出现13个和12个布拉格衍射峰,由此计算了它们的等同周期。用模型计算了它们衍射峰的强度,得到了与实验一致的衍射强度奇偶起伏的结果。在混合酸的LB膜中,可以观察到等同周期随混合比变化的规律。     

四(十六烷硫基)四硫富瓦烯/硬脂酸混合LB膜的结构研究

我们考察了四(十六烷硫基)四硫富瓦烯/硬脂酸(THT-TTF:SA=1:n)在气一液界面的聚集状态及在LB膜中的排列.当n=1时,THT-TTF分子在气-液界面形成了双分子膜;当n>6时,THT-TTF分子形成了单分子膜;1相似文献   

二价钌有机螯合物Ru(dpphen)2+3与花生酸混合LB膜的结构及光谱特性

对不同组分的Ru(dpphen)2+3［简称Ru(Ⅱ)］与花生酸(AA)在纯水亚相上的混合单分子膜的相容性、分子间相互作用以及凝聚单分子膜的结构进行了研究. 成功地将这种功能单体分子膜转移到固体载片上,制备成混合LB膜. 紫外-可见光谱、发射光谱及小角X光衍射表明这种混合LB膜是一种稳定、均一、具有良好的层状结构, 并且在可见光范围内具有很强的吸收及发射峰的功能膜.     

从鱿鱼顶骨β-甲壳素合成的丙酰化甲壳素的结晶结构

分别从α 甲壳素 (来源于蟹壳 )和 β 甲壳素 (来源于鱿鱼顶骨 )制备丙酰化甲壳素。丙酰化β 甲壳素的大角X光衍射图出现 2 0个衍射峰 ,而丙酰化α 甲壳素只在 2 0°左右出现弥散峰。发现丙酰化β 甲壳素的结晶属三斜晶系 ,a =7.997,b =1 3.0 67,c =6.31 6(任意单位 ) ,α =98°5 6′ ,β =1 0 4°1 9′,γ =82°2 6′。列表说明了各衍射峰的归属。据分析 ,每个单元晶胞内含一根分子链的 2 .5个葡萄糖残基单元。分子轴为b轴     

X衍射指纹图谱及相似度分析用于鉴别野生和栽培天麻

用X射线粉末衍射法建立了野生和栽培天麻及伪品羊角天麻的指纹图谱。通过数字信号处理技术提取天麻样品的特征信息,按2θ进行相似度计算和分析。天麻的XRD指纹图谱呈多峰重叠的弥散性峰,识别图谱的整体轮廓能区分真伪天麻。野生与栽培天麻的差异主要是2θ在5～10°和30～50°间,通过数字信号处理技术提取低频信号,能有效鉴别野生和栽培天麻。相似度的计算结果进一步表明方法的可行性。     

二价钌有机螯合物Ru（dpphen）3^2＋与花生酸混合LB膜的结构及光谱特性

对不同组分的Ru(dpphen)3^2 [简称Ru(Ⅱ）]与花生酸（AA）在纯水来相上的混合单分子膜的相容性、分子间相互作用以及凝聚单分子膜的结构进行了研究,成功地将这种功能单体分子膜转移到固体载片上,制备成混合LB膜、紫外－可见光谱、发现光谱及小角X光笛射表明这种混合LB膜是一种稳定、均一、具有良好的层状结构,并且可在可见江范围内具有很强的吸收及发射峰的功能膜。     

5,10,15,20-四-(4-N,N,N-二甲基十六烷基氨基苯基)卟啉LB膜结构的研究

研究了两亲性卟啉5,10,15,20-四-(4-N,N,N-二甲基十六烷基氨基苯基)卟啉(TDMC₁₆PP)在气/液界面上的成膜性能,制备了其多层LB膜。用UV-Vis吸收光谱、荧光光谱、偏振UV-Vis吸收光谱和小角X射线衍射对LB膜进行了测试表征。结果表明:两亲性卟啉TDMC₁₆PP具有良好的成膜性能,其LB膜性质稳定,有较好的结构均匀性和周期性。在LB膜内,脂肪链并不是直立的,卟啉大环平面与基片平面成42.5°排列。     

电化学现场X-射线衍射电解池及电极调节装置

设计了一种能在常规粉末衍射仪上通用的电化学现场X-射线衍射测定的电解池及其电极调节装置,实现了电极表面与窗片之间液层厚度的连续可调,精度达±2μm。理论计算与实测结果均表明液层厚与衍射峰强度和峰位之间存在定量关系。     

四(十六烷硫基)四硫富瓦烯/硬脂酸混合LB膜的结构研究

我们考察了四(十六烷硫基)四硫富瓦烯/硬脂酸(THT-TTF:SA=1:n)在气-液界面的聚集状态及在LB膜中的排列,当n=1时,THT-TTF分子在气-液界面形成了双分子膜;当n>6时,THT-TTF分子形成了单分子膜;1相似文献   

两亲性卟啉-紫精化合物LB膜的结构及光电性质研究

本文制备了两亲性卟啉-紫精化合物的LB膜材料, 用π-A等温曲线、吸收光谱、小角和低角X射线衍射以及扫描隧道电镜(STM)等方法研究了LB膜的结构。结果表明, LB膜内分子排列是二维有序的超晶格结构, 卟啉环在基片上的排列呈"站立"状态。单个分子占有面积为1.15nm^2, 单层高度为2.35nm, 相邻裂间的距离为1.07nm。这种规则有序的两亲性卟啉-紫精化合物呈现出良好的光量子收率和光电响应特性。     

10,12—双炔廿三酸盐的LB膜特性研究

本文合成了10,12-双炔廿三酸,并用其在Si、SiO_2、CaF_2等基片上沉积了LB膜,结果表明,10,12-双炔廿三酸的镉盐成膜更稳定。这种LB膜在紫外光辐照下很快聚合,聚合前后的紫外-可见吸收光谱发生规律性的变化,并保持层状结构,等同周期稍变。通过红外吸收的二向色性分析,确定了该分子的取向。     

The incorporation of C_(60) in cavities of 5,10,15,20-tetra-4-oxy(2-stearic acid)phenyl porphyrin in LB film

The structure and properties of mixed monolayer or LB film of 5,10,15,20-tetra-4-oxy(2-stearic acid)phenyl porphyrin/C60 were studied. A isotherms and small angle X-ray diffraction (SAXD) results show that C60 molecules were incorporated into the cavities of por-phyrin molecules in mixed monolayer and LB film . UV-vis spectra of mixed LB films show that the absorption intensity of porphyrin varied compared with pure porphyrin film, probably arising from the interactions between C60 and porphyrin ring. C60 molecules in mixed systems are well-dispersed. The TPP(CO2H)/C60 mixed LB film is a kind of two-dimensional host-guest system.     

嵌入花生酸镉单层中的卟啉-紫精分子聚集行为的研究

本文制备了卟啉-紫精与花生酸镉混合LB膜, 用紫外可见光谱研究了膜中卟啉基团的聚集及取向, X射线衍射说明混合LB膜具有层状有序的周期结构。扫描电镜结果表明: 通过调节膜的表面压可使聚集成"微畴"的卟啉-紫精均匀分布在花生酸镉单分子层中, 随膜表面压的增大, 小的"微畴"相互连接形成更大的"微畴"。电子衍射说明混合膜中两组份分相存在, 且都为六角对称的有序结构。     

Surface plasmon resonance on the LB monolayer of solvent-soluble silicon phthalocyanine

Thin films of bis-(p-chlorophenoxy) (tetra-4-nitrophthalocyaninato)silicon, TNPcSi(OPhCl-p)₂, were prepared by using Langmir-Blodgett techniques and the morphology of the film was investigated by AFM (atomic force microscope) analysis. It has been found that the LB films were successfully transferred onto substrates like mica, gold deposited glass, and pure glass with domains aggregated on the substrates. Surface plasmon resonance has been used to investigate the interaction between sulfur dioxide and a monolayer of TNPcSi(OPhCl-p)₂ LB film. It has been found that the monolayer of LB film transferred onto gold deposited glass gave a 0.55° shift of resonant angle and an additional 0.45° shift of resonant angle after exposion in sulfur dioxide\atomospheric ambient for twenty minute. The UV–visible absorption spectrum of the LB films of TNPcSi(OPhCl-p)₂ showed that there is chemical changes in the film after the exposure to the sulfur dioxide ambient. This work has shown a promising application as an optical gas sensor.     

非典型双亲性β-二酮稀土配合物LB膜荧光稳定性 的研究

研究了一系列非典型双亲性β-二酮稀土配合物LB膜在紫外光激发下两种不同条件时的荧光稳定性：(1)每40s检测一次;(2)每周检测一次。第一种条件下,稀土配合物LB膜的荧光强度以直线关系缓慢衰减,30次后变化约4%。第二种条件下荧光强度呈单指数关系衰减。荧光强度衰减至原始值的1/e时间τ约为10周{如n[Eu·(TTA~3)Phen]:n(AA)=1:1LB的τ为11.4周}。相同激发次数(大于1次)时,第二种条件比第一种条件下LB膜荧光强度小。紫外可见吸收光谱结果表明,受紫外光激发后,LB膜中稀土配合物的吸光度降低且随时间延长吸光度进一步降低,导致荧光发射强度减小。放置半年后LB膜的光强度仍可被检测到。低角度X衍射结果表明,LB膜具有良好的周期性层状结构且层状结构可长时间稳定存在,有利于提高稀土配合物LB膜的荧光稳定性。     

Polymer-surfactant layered heterostructures by electropolymerization of phenosafranine in Langmuir-Blodgett films

Langmuir-Blodgett (LB) films of the water-soluble dye phenosafranine (PS) have been prepared by its adsorption from aqueous dye solution to an arachidic acid (AA) monolayer at the air-water interface. Atomic force microscopy (AFM) images of the LB films revealed the effect of change in pH of deposition on the degree of complexation of AA with the PS dye. Well-defined circular islands and holes were observed which disappeared with the increase in pH. Polarized absorption studies indicated that the dye molecules are oriented uniaxially with their long axis titled at a constant angle to the surface normal of the LB film. Within the restricted geometry of the LB film, the PS dye was electropolymerized to form a two-dimensional film of poly(phenosafranine) sandwiched between arachidic acid layers. The film was characterized by IR spectroscopy, cyclic voltammetry, and AFM. X-ray diffraction studies reveal the presence of a layer structure in the AA-PS LB film before and after polymerization. The polymer film showed highly anisotropic electrical conductivity of ca. 10 orders of magnitude. This indicates the formation of two-dimensional polyPS layers between arachidic acid layers resulting in a layered heterostructure film having alternate conducting and insulating regions. Also, the conductivity of the polyPS prepared from LB film was found to be approximately 2.5 times higher than the conductivity of polyPS prepared by solution polymerization method.     

不含亲水基团的偶氮苯衍生物L-B膜的制备和性质研究

本文合成了具有一定结构特点的偶氮苯的衍生物, 以元素分析和^1HNMR鉴定了B产物的组成和结构。采用L-B技术制备了其多层L-B膜, 以紫外可见光谱研究了膜中分子的聚集状态和膜的纵向均匀性; 以偏振紫外确定了膜中分子偶氮基的取向; L-B膜的小角度X射线衍射结果表明膜具有层状有序的周期性结构。     

偶氮苯衍生物Langmuir-Blodgett膜的结构与红外热释电性能

利用Langmuir-Blodgett(LB)方法,在镀有金属膜的盖玻片和CaF_2衬底上转移了双嗜性偶氮苯衍生物多层LB膜.用线性红外二向色性光谱方法研究了分子的各跃迁矩的取向和分子长轴的取向.利用X射线衍射方法研究了LB膜的有序周期结构,讨论了双周期结构与高热释电活性的关系.