This paper describes the phase transition behavior of a copolysiloxane (1) bearing a 4-cyanophenyl benzoate core at the terminal of the side chain. While polymer 1 exhibits only a nematic phase in bulk, it easily forms layer structures involving monolayer, trilayer, and complex multilayers at the air-water interface. In the monolayer state the cyano groups are anchored on the water surface and the aromatic moieties involving the copolysiloxane chain are directed towards the air phase. The trilayer has a partially bilayer structure on the top of the monolayer, where the layer structure was confirmed by X-ray diffraction measurement of the LB films, giving the layer spacing of 1.47 times of the calculated side chain length. Complex multilayer transitions were also observed by a further compression or changing subphase temperature.

Liquid crystal polysiloxanes with a lateral 4-(4-cyanophenoxycarbonyl)phenyl 4-(2-perfluoroalkylethoxy)-2-propyleneoxybenzoate side group and a 4-decyloxy-2-propyleneoxy-benzoate hydrocarbon analogue were prepared, and the mesomorphic properties were determined by the microscopic observation and differential scanning calorimeter (DSC) thermogram, and the layer structure of the smectic A phase was characterized by an X-ray diffraction experiment. The introduction of the perfluoroalkyl chain to the polymer remarkably enhances the smectic properties due to the strong fluorophilic interactions around the perfluoroalkyl chain. The effect of the perfluoroalkyl chain on the monolayer formation was studied at the air–water interface. The surface pressure–area isotherms show that the perfluoroalkyl chain enhances the stability of the monolayer versus surface pressure. In the condensed state the cyano group in the side chain is assumed to be anchored on the water surface and the mean axis of the liquid crystal core is approximately normal to the water surface. The monolayers were easily deposited on a hydrophobic glass slide, giving uniform Langmuir–Blodgett (LB) films by the vertical deposition method. The X-ray diffraction results indicate that the perfluorooctyl chain effectively stabilizes the layer structure in the multilayer LB film at room temperature. The side chain monomers also show a similar behavior to the polymers and give uniform LB films on hydrophobic glass slides.

A new type of self-assembled film was prepared by alternating deposition of oppositely charged meso-tetra-(4-trimethylaminophenyl) porphyrin nickel iodide (NiTAPPI) and citrate-stabilized CdSe nanoparticles. The stepwise deposition process was monitored by means of UV-vis spectroscopy. The interaction between the porphyrin and CdSe nanoparticles was characterized with UV-vis and fluorescence spectra. The SEM images showed the formation of densely packed two-dimensional array and the conversion of disorder-to-order of CdSe nanoparticles on the quartz substrate modified by PDDA when depositing positively charged NiTAPPI. The self-assembled film placed in ambient air exhibited significant enhancement of fluorescence intensity. The effects of heat treatment and UV-light irradiating on fluorescence properties of the composite films were investigated in details.

酞菁比合物是具有高稳定性的大键共轭体系。目前，酞菁LB膜研究大多采用单体小分子，其气敏特性已有报道。小分子LB膜机械强度及膜结构稳定性差、器件寿命短，无法达到实用阶段，而聚合物LB膜可以提高膜的机械强度，改善膜的性能。酞菁聚硅氧烷是具有优良氧比还原性质和光学性质的新型LB膜材料，膜分子堆集密度高，缺陷少，热和机械稳定性高，Vogel等，将其用作场效应晶体管的栅极膜材料，制作了性能优良的离子传感器。

In this paper, Langmuir-Blodgett films of hematoporphyrin mixed with stcaric acid have been investigated. It was found that hematoporphyrin molecules were inlaid in monolayers of stearic acid. The UV-vis spectra of the LB films showed that there wasn't strong interaction between ematoporphyrin molecules when compared with the solution spectrum. The particular orientation of hematoporphyrin macrocycle in LB f'dm was con-firmed by polarized' UV-vis spectra.