Fe2O3超微粒／硬脂酸得合LB膜的制备和表征研究

用超声分散的方法将Ｆｅ２Ｏ３超微粒分散于硬脂酯／正己烷／氯仿溶液中，用ＬＢ膜技术进行组装。结果表明：ＦｅＯ３超微粒能均匀地分散在有机溶剂中，并且能够被硬脂酸包裹；Ｆｅ２Ｏ３超微粒／硬酯酸单分子膜的成膜性能良好，Ｆｅ２Ｏ３超微粒／硬脂酸复合ＬＢ膜具有层状结构；在Ｆｅ２Ｏ３超微粒的晶格结构和硬脂酸单分子膜的晶格结构相匹配的情况下，Ｆｅ２Ｏ３超微粒能够被有序组装。     

Fe_2O_3超微粒/硬脂酸复合LB膜的制备和表征研究

用超声分散的方法将Ｆｅ２Ｏ３超微粒分散于硬脂酸／正己烷／氯仿溶液中，用ＬＢ膜技术进行组装。结果表明：Ｆｅ２Ｏ３超微粒能均匀地分散在有机溶剂中，并且能够被硬脂酸包裹；Ｆｅ２Ｏ３超微粒／硬酯酸单分子膜的成膜性能良好，Ｆｅ２Ｏ３超微粒／硬脂酸复合ＬＢ膜具有层状结构；在Ｆｅ２Ｏ３超微粒的晶格结构和硬脂酸单分子膜的晶格结构相匹配的情况下，Ｆｅ２Ｏ３超微粒能够被有序组装。     

C60在卟啉衍生物Langmuir单层膜中的分散状态

研究了Ｃ６０在四苯基卟啉衍生物５，１０，１５，２０－四－对（癸酸α氧基）苯基卟啉（ＴＤＰＰ）及５，１０，１５，２０－四－对（乙酸α氧基）苯基卟啉（ＴＡＰＰ）单层膜中的分散状态。空气／Ｃｄ＾２＋水溶液界面上混合单层膜的π－Ａ等温线、混合膜与花生酸（ＡＡ）形成的交替多层膜的低角Ｘ射线衍射实验及混合单层ＬＢ膜的ＵＶ－Ｖｉｓ光谱表明，在ＴＤＰＰ／Ｃ６０（１：１）的混合单层膜中，Ｃ６０以单分子或（和）聚集体     

有机HTDIOO分子LB膜结构的AFM研究

利用原子力显微镜（ＡＦＭ）对有机分子ＨＴＤＩＯＯ单层和多层ＬＢ膜结构进行了观察。实验结果表明，针尖与ＬＢ膜表面分子间的相互作用力会对成像的膜结构有影响。当悬臂针尖与ＬＢ膜表面分子的相互作用力较大时，针尖会扰动ＨＴＤＩＯＯ分子在单层ＬＢ膜中的有序排列。ＨＴＤＩＯＯ单层ＬＢ膜具有有序结构；而在多层ＬＢ膜中，ＨＴＤＩＯＯ分子则聚集在一起形成了一定的畴结构。     

酞菁铜与四氰代二甲基苯醌电荷转移反应的测定

用红外光谱、紫外可见光谱、循环伏安法等研究了三．（２，４－二特戊基苯氧基）－８－喹淋氧基酞菁铜（简称酞菁铜）和２－十八烷基－７，７，８，８－四氰二甲基苯醌（简称Ｃ１８－ＴＣＮＱ）在Ｌａｎｇ－ｍｕｉｒ－Ｂｌｏｄｇｅｔｔ（ＬＢ）膜中的电荷转移。实验结果表明，在交替和混合ＬＢ膜中，酞菁铜和Ｃ１８－ＴＣ－ＮＱ分子之间均发生了电荷转移，其中酞菁铜为给体分子，ＴＣＮＱ为受体分子。在混合ＬＢ膜中，电荷转移程度较大。电导率测量表明荷移反应使ＬＢ膜的电导率较纯酞菁铜ＬＢ膜提高了３个数量级。     

单臂液晶冠醚LB膜的研究

首次研究了４种单液晶冠醚（１～４）的ＬＢ膜成膜特性，实验发现它们在气－液界面均可形成单分子膜，但４的稳定性较差，３易转移到玻璃基片上形成Ｙ型膜。４种化合物与硬脂酸以１：１混合形成稳定的Ｙ型ＬＢ膜。小角Ｘ射线衍射证实了膜的有序结构。用ＣＰＫ原子模型对成膜分子构型和面积进行了估算，其结果与实验一致。并讨论了分子结构对成膜性能的影响。     

La^3＋和Ca^2＋对金电极上谷胱甘肽单分子膜离子闸门的影响

谷胱甘肽能自组装吸附到金电极上形成单分子膜。该膜能阻止Ｆｅ（ＣＮ）６离子在金电极上还原，起离子闸门的作用。当溶液中加入Ｌａ＾３＋或Ｃａ＾２＋时，了穿透膜的能力得到改善。本课题应用循环伏安法和计时库仑法，在ＰＨ５．６的溶液中研究了Ｌａ＾３＋的调控能力，与Ｃａ＾２＋比较，发现在改变谷胱甘肽单分子膜的结构和Ｆｅ（ＣＮ）６离子的扩散系数方面，Ｌａ＾３＋具有更强的能力。     

酞菁铜与四氰化二甲基苯醌电荷转移反应的测定

用红外光谱、紫外可见光谱、循环伏安法等研究了三（２，４－二特戊苯氧基）－８－喹啉氧基酞菁铜和２－十八烷基－７，７，８，８－四氰二基苯醌在Ｌａｎｇｍｕｉｒ－Ｂｌｏｄｇｅｔｔ（ＬＢ）膜中的电荷转移。实验结果表明，在交替和混合ＬＢ膜中，酞 菁铜和Ｃ１８－ＴＣ－ＮＱ分子之间均发生了电荷转移，其中酞菁铜为给体分子，ＴＣＮＱ为受体分子。在混合ＬＢ膜中，电葆转移程度较大。电导率测量表明荷移反应使ＬＢ膜的电导率较     

亚铁氰化钾掺杂聚中性红膜修饰电极的制备及电分析特性

对亚铁氰化钾掺杂的聚中性红膜修饰电极的制备及其电化学行为和Ｆｅ（ＣＮ）６４－在该电极上的催化作用进行了研究。结果表明,该修饰电极对Ｆｅ（ＣＮ）６４－存在较强的电催化作用,催化峰电流与Ｆｅ（ＣＮ）６４－的浓度在 １．０×１０－５～２．０×１０－３ ｍｏｌ／Ｌ范围内呈良好的线性关系,检测限可达５×１０－６ｍｏｌ／Ｌ     

Ag4Fe（CN）6溶胶表面对PABA分子增强机制及吸附态的探讨

通过向对氨基苯甲酸（ＰＡＢＡ）－Ａｇ_４Ｆｅ（ＣＮ）_６溶胶体系分别滴加少量Ｋ_４Ｆｅ（ＣＮ）_６、Ｋ_３Ｆｅ（ＣＮ）_６、Ｎａ_２Ｓ_２Ｏ_３、Ｈ_２Ｏ_２、ＮａＣｌ和ＮａＮＯ_３水溶液，以及改变体系ｐＨ值对ＰＡＢＡＳＥＲＳ谱带影响的观测，探讨Ａｇ_４Ｆｅ（ＣＮ）_６溶胶体系对ＰＡＢＡ分子的增强机制及在胶体表面受到极大增强的分子吸附态。     

Subphase pH effect on composition and structure of Fe(III) arachidate monolayers

The arachidic acid monolayers on Fe(III) subphase surfaces with various pH values have been studied. The π–A isotherms of monolayers and Fourier transform infra-red (FTIR) spectra of Langmuir–Blodgett (LB) films show that the films obtained on different pH subphases with a concentration of Fe(III) 5×10⁻⁵ M have different compositions. At low pH (2.4), the film appears to be almost 100% acid. The content of Fe(III) arachidate increases with increasing pH, at pH 3.7, the film appears to be 100% salt; and the content of salt decreases with pH larger than 3.7. The transmission electron microscope (TEM) observations show that the monolayer structures changed from patch aggregates formed by Fe(III) arachidate at low pH to a network or dotted structures formed by hydrolysates of Fe(III) at high pH. The Brewster angle microscopy (BAM) experiments show the different monolayer behaviors at various pH. These results indicate that the subphase pH greatly influenced the arachidic acid monolayers.     

液晶聚合物的单层与Langmuir-Blodgett膜

系统研究了手性液晶聚硅氧烷和光致变色液晶聚硅氧烷两个毓的侧链液晶聚合物在空气/水界面的单层行为和Langmuir-Blodgett(LB)膜沉积特性,对LB膜结构与存在的聚集现象进行了系统的表征,并初步探讨了LB膜中液晶聚合物表现的功能性。     

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。     

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.     

Morphological investigation of hybrid Langmuir-Blodgett films of arachidic acid with a hydrotalcite/dendrimer nanocomposite

A hydrotalcite clay/dendrimer nanocomposite prepared by the ionic exchange process was adsorbed from suspension of the nanocomposite on a Langmuir monolayer of arachidic acid at the air/water interface, followed by compressing and transferring onto an arachidic acid monolayer Langmuir-Blodgett (LB) film on mica. For comparison, the hydrotalcite-adsorbed hybrid film was also prepared. The morphology of hydrotalcite and the nanocomposite studied by transmission electron microscopy indicated the layered structures with respectively 1.2 +/- 0.3 and 3.2 +/- 0.5 nm repeating distances. The hybrid Langmuir films displayed the occupied surface area of 0.24 nm2 for both hydrotalcite and the nanocomposite. The formation of hybrid Langmuir films was confirmed by Brewster angle microscopy. Atomic force microscopic images of hybrid LB films revealed the formation of plateau domains with the height difference of 6 nm for hydrotalcite and 12 nm for the nanocomposite and the presence of dendrimers adsorbed on the clay surface of the nanocomposite.     

冠醚和卟啉与花生酸混合单分子膜行为研究

本文将3'-正十五烷基苯并15-冠-5和六种无脂链难于直接成膜的四苯基卟啉与花生酸混合形成单分子膜。结果表明, 冠醚被嵌进而卟啉被挤出花生酸单分子层。卟啉-花生镉LB膜的可见吸收光谱指出卟啉分子成团聚集。扫描电镜观察了卟啉-花生酸镉混合LB膜的表面形貌, 在膜表面上无金涂层时直接测到了混合膜的相分离。     

由组分可控的LB膜前驱物法制备Y2O3稳定立方相ZrO2的超薄陶瓷膜

由有机LB膜技术发展了一种制备组分、厚度可控的无机超薄陶瓷膜的方法.以Zr、 Y的β-二酮络合物的作为"表面离子"代替传统的亚相离子,沉积它们与花生酸的混合LB膜.并将它作为前驱物,经臭氧处理和热处理,成功制得了Y2O3稳定的立方相ZrO2超薄膜(YSZ).用X射线衍射(XRD)、 X射线光电子能谱(XPS)等手段研究了YSZ薄膜的相结构和其组成.结果表明,超薄陶瓷膜中Zr与Y的含量比率控制得很好,且形成Y2O3稳定的立方相ZrO2.说明这种方法可以成功地用来制备组分和膜厚均可控的纳米陶瓷膜.     

Synthesis and Structure of PEDOT Prepared through a Modified LB Film Method

Adopting LB film method, an arachidic acid (AA)/PEDOT multilayer LB film and polymerized EDOT monomers in hydrophilic group of LB were chosen to prepare the arachidic acid (AA)/PEDOT multilayer LB film. UV-Vis, FT-IR and XPS analyses implied that EDOT was effectively polymerized in film, and thus PEDOT conducting polymer was produced. Analyses of XRR and SIMS indicated that the film had a well-arranged lamella structure, and further research showed that polymerization of EDOT in AA film destroyed the orderliness of the original LB film. This phenomenon could be related to the destructive effect of polymerization on the layered structure. We used four-point probe and semiconductor instrument to study the conductivity property of the film, and observed that the conductivity of AA/PEDOT film had sudden changes with the changes of processing time in an effective conduction network, which was caused by "permeability" in conducting channel of multilayer film. The test results also indicated that the conductivity of AA/PEDOT film was obviously better than that of spin-coating PEDOT/PSS or ODA-SA/PEDOT-PSS film due to the higher π structure of PEDOT structure and ordered film structure.     

Formation and structure of a spontaneously adsorbed monolayer of arachidic on silver

A stable monolayer assembly can be formed on silver by the spontaneous adsorption (SA) of arachidic acid (CH₃(CH₂)₁₈COOH) from hexadecane. IR spectroscopy and optical ellipsometry indicate that the structure is similar to the Langmuir-Blodgett (LB) multilayer assembly of cadmium arachidate on silver. This is a definitive example of the correspondence between the structure of LB and SA assemblies.     

Single molecular detection of a perylene dye dispersed in a Langmuir-Blodgett fatty acid monolayer using surface-enhanced resonance Raman scattering

The Langmuir-Blodgett (LB) monolayer technique was used to fabricate single molecule LB monolayer containing bis(phenethylimido)perylene (PhPTCD), a red dye dispersed in arachidic acid (AA) with an average doping of 1 molecule per microm2. The monolayer was transferred onto Ag island films to obtain spatially resolved surface-enhanced resonance Raman scattering (SERRS) spectra. The mixed LB monolayers were fabricated with a concentration, on average, of 1, 6, 19 and 118 PhPTCD molecules per microm2 in AA. The AA provides a two-dimensional host matrix whose background signal does not interfere with the detection of the probe molecule's SERRS signal. The properties of the single molecule detection were investigated using micro-Raman with a 514.5-nm laser line. The Ag island surfaces coated with the LB monolayer were mapped with spatial steps of 3 microm and global chemical imaging of the most intense SERRS band in the spectrum was also recorded. The SERRS and surface-enhanced fluorescence (SEF) of the neat and single molecule LB monolayer were recorded in a temperature range from liquid nitrogen to + 200 degrees C. Neat PhPTCD LB monolayer spectra served as reference for the identification of characteristic signatures of the single molecule behavior. The spatial resolution of Raman-microscopy experiments, the multiplicative effect of resonance Raman and SERRS, and the high sensitivity of the new dispersive Raman instruments, allow SERRS to be part of the family of single molecular spectroscopies.