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。     

组份可控的钌螯合物功能单分子膜

用作“表面离子”的钌螯合物Ru(dpphen)32+与脂肪酸类成膜分子以1:2混合时能够得到稳定的混合单分子膜.以十八烷基三氯硅烷（octadecayl trichloro silane, OTS）分子部分取代Ru(dpphen)32+,得到功能分子组份可控的混合单分子膜.研究表明,OTS分子在纯水表面上可以形成交联网状单分子膜结构,混入硬脂酸（SA）分子后,网状结构逐渐被破坏.SA含量增加,破坏的程度就增大,直至SA/OTS为3:1时,完全没有网状交联结构,形成可以用来沉积LB膜的均匀致密的单分子膜.表面离子Ru(dpphen)32+与OTS和SA一起构成三组份混合单分子膜,OTS和Ru(dpphen)32+为表面离子.单分子膜中混有Ru(dpphen)32+分子,可以有效地阻止OTS的交联发生,同时Ru(dpphen)32+/SA基团与OTS/SA基团是均匀共混的.改变Ru(dpphen)32+/SA基团与OTS/SA基团的混合比,即可以做到Ru(dpphen)32+的组份精确可控,得到可用来沉积LB膜的均一、稳定的单分子膜.     

酞菁铜化合物LB膜的制备及结构形态研究

利用LB技术研究了带有4个长碳氢链的酞菁铜化合物(CuC12Pc)的单分子膜及它与十八胺(ODA)、二十酸(AA)的混合LB膜的聚集结构形态. 结果表明这种酞菁铜化合物在气液界面上可以形成比较稳定有序的双层Langmuir膜, 且可以转移质量较好的多层LB膜. 利用原子力显微镜(AFM)研究了酞菁铜分子的聚集体结构, 发现CuC12Pc/AA混合膜表现为网状的聚集结构, 而CuC12Pc/ODA混合膜形成长岛颗粒状聚集, 并结合UV-Vis吸收光谱讨论了酞菁铜分子形成不同聚集结构的原因.     

花生酸-钌有机螯合物Ru(phen)2 3+的单分子膜和LB膜中分子聚集行为的研究

以功能性的钌有机螯合物Ru(phen)2 3+作为亚相离子,花生酸在亚相表面上形成稳定的单分子膜.π-A等温线和动态弹性测量表明,此膜因花生酸与钌螯离子发生了静电相互作用而有更大的可压缩性,并在固态区发生了分子聚集.用垂直法成功地制备了嵌有Ru(phen)2 3+离子的超薄有序Y-型LB膜.光谱实验表明,所得LB膜是稳定、均匀的层状三明治结构,在层面内Ru(phen)23+与花生酸结合成相对稳定的分子基团并形成了J-聚体.     

花生酸-钌有机螯合物Ru(phen)_3~(2+)的单分子膜和LB膜中分子聚集行为的研究

以功能性的钌有机螯合物Ru(phen) 2 + 3 作为亚相离子 ,花生酸在亚相表面上形成稳定的单分子膜 .π A等温线和动态弹性测量表明 ,此膜因花生酸与钌螯离子发生了静电相互作用而有更大的可压缩性 ,并在固态区发生了分子聚集 .用垂直法成功地制备了嵌有Ru(phen) 2 + 3 离子的超薄有序Y 型LB膜 .光谱实验表明 ,所得LB膜是稳定、均匀的层状三明治结构 ,在层面内Ru(phen) 2 + 3 与花生酸结合成相对稳定的分子基团并形成了J 聚体     

花生酸-钌有机螯合物Ru(phen)_3~(2+)的单分子膜和LB膜中分子聚集行为的研究

以功能性的钌有机螯合物Ru(phen)_3~(2+)作为亚相离子,花生酸在亚相表面 上形成稳定的单分子膜。π-A等温线和动态弹性测量表明,此膜因花生酸与钌螯离 子发生了静电相互作用而有更大的可压缩性,并在固态区发生了分子聚集。用垂直 法成功地制备了嵌有Ru(phen)_3~(2+)离子的超薄有序Y-型LB膜。光谱实验表明, 所得LB膜是稳定、均匀的层状三明治结构,在层面内Ru(phen)_3~(2+)与花生酸结 合成相对稳定的分子基团形成了J-聚体。     

聚离子复合物单分子膜的聚集结构研究

LB膜在非线性光学材料、生物传感器等众多领域有着诱人的应用前景,受到了广泛的关注.为了充分发挥LB 膜的功能,必须制备高度取向、无缺陷的LB 膜,因此充分把握LB膜的构成单元单分子膜的聚集结构显得十分重要.由于气液界面离子复合结构的形成对单分子膜的聚集结构产生很大的影响,近年,有关这方面的工作越来越活跃.本文以探讨     

用“表面离子”法制备组分可控的LB膜超分子体系

综述了LB膜超分子体系中“表面离子”法的概念及其与传统的“亚相离子”法的区别. 分别以钌螯合物(Ru(ph2phen)32＋)和金属β-二酮螯合物为例,详细描述这两类不同的“表面离子”在水面上的成膜作用机理,并举例说明“表面离子”法在铺展膜和LB膜中,功能分子二维密度和凝聚态结构精确可调,并对“表面离子”法在多功能分子体系中的应用作了详细描述.     

一种新的具有给体-受体结构的有机分子的合成及LB膜研究

本工作合成了一种新的具有给体-受体结构的长碳链有机分子, 2, 3-二(十六烷硫基)-5-(4'-硝基苯亚甲基)-1, 4-二硫代-2-环戊烯, 对其单分子膜的成膜性能进行了研究。在适宜条件下制备了单层及多层LB膜。通过电子衍射、X射线衍射、紫外-可见吸收光谱等手段对LB膜的结构进行了表征。实验结果表明, 这种化合物的成膜性能很好。单分子层膜的二次谐波测试表明该发色团分子具有较好的二阶非线性光学性。     

聚苯胺基LB膜的制备及气敏特性的研究

以聚苯胺 (PAN)为原料 ,利用LB(Langmuir Blodgett)超薄分子膜技术 ,制备了不同层数的纯聚苯胺LB膜及聚苯胺与乙酸 (AA)混合 (PAN AA)LB膜 ,对其进行了紫外 可见光光谱分析研究 ,并对不同层数的聚苯胺基LB膜的二氧化氮 (NO2 )气敏特性进行了研究 ,发现PANLB膜较PAN AALB膜具有更好的敏感性、响应性和可逆性 ,3层和 15层PANLB膜对相对百分比为 2 0× 10 -6NO2 的响应时间分别为 10s和 30s,15层PANLB膜的恢复时间约为 4min     

DNA分子在气液界面的组装相变特性及其LB膜结构研究

对十八胺与DNA在气液界面上组装及其相变过程进行了研究，利用AFM观察了不 同压力下转移的DNA复合LB膜结构。发现在低表面压时，DNA复合单分子膜表现为技 术发散的分形结构；随着压力的升高，DNA复合膜逐渐由紧密的网状排布结构变为 团聚的块状和团簇结构。表明通过调节膜压，可使膜内DNA分子的构象发生大的变 化，从而生成具有特定形态的二维纳米图案。这种具有特殊形态和结构的DNA LB膜 可望为合成新型生物纳米结构有序功能体系提供模板。     

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。     

Using phospholipid Langmuir and Langmuir-Blodgett films as matrix for urease immobilization

The immobilization of enzymes in organized two-dimensional matrices is a key requirement for many biotechnological applications. In this paper, we used the Langmuir-Blodgett (LB) technique to obtain controlled architectures of urease immobilized in solid supports, whose physicochemical properties were investigated in detail. Urease molecules were adsorbed at the air-water interface and incorporated into Langmuir monolayers of the phospholipid dipalmitoyl phosphatidyl glycerol (DPPG). Incorporation of urease made DPPG monolayers more flexible and caused the reduction of the equilibrium and dynamic elasticity of the film. Urease and DPPG-urease mixed monolayers could be transferred onto solid substrates, forming LB films. A close packing arrangement of urease was obtained, especially in the mixed LB films, which was inferred with nanogravimetry and electrochemistry measurements. From the blocking effect of the LB films deposited onto indium tin oxide (ITO) substrates, the electrochemical properties of the LB films pointed to a charge transport controlled by the lipid architecture.     

Study of Langmuir and Langmuir-Blodgett films of odorant-binding protein/amphiphile for odorant biosensors

To make ultrathin films for the fabrication of artificial olfactory systems, odorant biosensors, we have investigated mixed Langmuir and Langmuir-Blodgett films of odorant-binding protein/amphiphile. Under optimized experimental conditions (phosphate buffer solution, pH 7.5, OBP-1F concentration of 4 mg L(-1), target pressure 35 mN m(-1)), the mixed monolayer at the air/water interface is very stable and has been efficiently transferred onto gold supports, which were previously functionalized by self-assembled monolayers (SAMs) with 1-octadecanethiol (ODT). Atomic force microscopy and electrochemical impedance spectroscopy were used to characterize mixed Langmuir-Blodgett (LB) films before and after contact with a specific odorant molecule, isoamyl acetate. AFM phase images show a higher contrast after contact with the odorant molecule due to the new structure of the OBP-1F/ODA LB film. Non-Faradaic electrochemical spectroscopy (EIS) is used to quantify the effect of the odorant based on the electrical properties of the OBP-1F/ODA LB film, as its resistance strongly decreases from 1.18 MOmega (before contact) to 25 kOmega (after contact).     

稀土螯合物发光体LB膜的研究(I)

稀土有机配合物的发光研究近年来取得了可喜的近展.铕(Ⅲ)、铽(Ⅲ)、钐(Ⅲ)与β-二酮(β-dik),三正辛基氧化膦(TOPO)所形成的螯合物,以及它们的硝酸盐与邻菲咯啉(Phen)所形成的螯合物都是高光效的发光体,有广阔的应用前景,在某些方面已获得应用.如能把这些具有发光功能的稀土螯合物组装成有序的分子组合体,则很可能在分子光学技术,光电子技术等领域发挥重要作用.如何组装?本文用LB 膜技术,通过交替成膜或混     

Acidichromism in the Mixed Langmuir—Blodgett Films of Stearic Acid with a Carbazole—containing Schiff Base

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Thermodynamic characteristics and Langmuir-Blodgett deposition behavior of mixed DPPA/DPPC monolayers at air/liquid interfaces

The role of dipalmitoylphosphatic acid (DPPA) as a transfer promoter to enhance the Langmuir-Blodgett (LB) deposition of a dipalmitoylphosphatidylcholine (DPPC) monolayer at air/liquid interfaces was investigated, and the effects of Ca2+ ions in the subphase were discussed. The miscibility of the two components at air/liquid interfaces was evaluated by surface pressure-area per molecule isotherms, thermodynamic analysis, and by the direct observation of Brewster angle microscopy (BAM). Multilayer LB deposition behavior of the mixed DPPA/DPPC monolayers was then studied by transferring the monolayers onto hydrophilic glass plates at a surface pressure of 30 mN/m. The results showed that the two components, DPPA and DPPC, were miscible in a monolayer on both subphases of pure water and 0.2 mM CaCl2 solution. However, an exception occurs between X(DPPA)=0.2 and 0.5 at air/CaCl2-solution interface, where a partially miscible monolayer with phase separation may occur. Negative deviations in the excess area analysis were found for the mixed monolayer system, indicating the existence of attractive interactions between DPPA and DPPC molecules in the monolayers. The monolayers were stable at the surface pressure of 30 mN/m for the following LB deposition as evaluated from the area relaxation behavior. It was found that the presence of Ca2+ ions had a stabilization effect for DPPA-rich monolayers, probably due to the association of negatively charged DPPA molecules with Ca2+ ions. Moreover, the Ca2+ ions may enhance the adhesion of DPPA polar groups to a glass surface and the interactions between DPPA polar groups in the multilayer LB film structure. As a result, Y-type multilayer LB films containing DPPC could be fabricated from the mixed DPPA/DPPC monolayers with the presence of Ca2+ ions.     

长碳链正电糖甙和葡萄糖氧化酶混合Langmuir-Blodgett膜的光谱研究

合成了简称C₁₈的十八烷基-2-氨基-2-脱氧-β-D-吡喃葡萄糖甙。通过π-A曲线研究了C₁₈和GOD(葡萄糖氧化酶)的相互作用,并用光谱方法研究了转移的C₁₈/GOD混合LB膜的光谱特性。从圆二色性(CD)光谱结果可以看出,固定在C₁₈膜里的GOD二级结构发生了变化。低温荧光实验显示混合膜中一部分GOD仍然保持其天然结构,但另一些则发生了部分变性。     

Fabrication, structural characterization, and applications of langmuir and langmuir-blodgett films of a poly(azo)urethane

The synthesis of a poly(azo)urethane by fixing CO(2) in bis-epoxide followed by a polymerization reaction with an azodiamine is presented. Since isocyanate is not used in the process, it is termed "clean method" and the polymers obtained are named "NIPUs" (non-isocyanate polyurethanes). Langmuir films were formed at the air-water interface and were characterized by surface pressure vs mean molecular area per mer unit (Pi-A) isotherms. The Langmuir monolayers were further studied by running stability tests and cycles of compression/expansion (possible hysteresis) and by varying the compression speed of the monolayer formation, the subphase temperature, and the solvents used to prepare the spreading polymer solutions. The Langmuir-Blodgett (LB) technique was used to fabricate ultrathin films of a particular polymer (PAzoU). It is possible to grow homogeneous LB films of up to 15 layers as monitored using UV-vis absorption spectroscopy. Higher number of layers can be deposited when PAzoU is mixed with stearic acid, producing mixed LB films. Fourier transform infrared (FTIR) absorption spectroscopy and Raman scattering showed that the materials do not interact chemically in the mixed LB films. The atomic force microscopy (AFM) and micro-Raman technique (optical microscopy coupled to Raman spectrograph) revealed that mixed LB films present a phase separation distinguishable at micrometer or nanometer scale. Finally, mixed and neat LB films were successfully characterized using impedance spectroscopy at different temperatures, a property that may lead to future application as temperature sensors. Principal component analysis (PCA) was used to correlate the data.