No abstract

In this work, the very thin layer‐by‐layer (LBL) film that was constructed by dip coating method on indium tin oxide surface can be used in liquid crystal (LC) displays devices. The obtained results indicate that the ultrathin LBL film shows the homeotropic alignment layer, and a uniform vertical alignment of LC molecules was gained very easily. The progress of vertical‐aligned LC cells with a LBL layer was evaluated. The obtained threshold voltage and response time of the LC cell were 2.472 V and 12.5 ms, respectively. So, the competitive performance of the LC cell could allow new sign at a low‐cost budget with rubbing process in LC display technology.

Layer-by-Layer self assembly concept was designed for the construction of films from electrostatic polymers, we have f abricated nano hybrid organic/inorganic surfaces by alternating various different layers of electrostatic polymers and silica nano particles (10nm diameter). The obtained molecular structure leads to a nanoscale textures. Then hydrophobization of the final la yer by Azobenzene and OTMS-functionalized silica particles was carried out by grafting technique highly fluorinated azobenzen e, creating a monolayer with the formation of an azo function. The fluorinated surfaces (contact angle-133.7 0) and OTMS-SAM (contact angle-124 0) was shown a wenzel model super hydrophobic surfaces were obtained with the alternate of nine layers. This result demonstrates the possibility to construct LBL of polymers with functionalized silica nanoparticles for superhydrophbic sur face on ITO glass surface.

An azobenzene-spaced polysiloxane polymer was synthesized and characterized, and its isomerization was studied in solution and as a thin film by UV-Vis spectroscopy. The self-assembled monolayers (SAMs) on the silicon surface permit reversible molecular photoswitching. Contact angle results showed the hydrophilic nature of the trans-isomer compared to the cis-isomer. This was supported by the dipole moment calculation from density functional theory (DFT), which showed a higher value for the trans-isomer, thereby confirming its hydrophilic nature. The AFM study revealed polymeric brush-like structure on the silicon surface and confirmed its isomerization upon exposure to UV-Vis light.