2-D Columnar Assemblies Of Diblock Rod-Coil Molecules Incorporating Cholesteryl Group Molecules

Currently one of great interesting subjects in areas such as nanochemistry, biomimetic chemistry and materials science is considered to be the designing of functional supramolecular architectures for further synthesizing and characterizing the well-defined shapes and predicted functions. The molecules undergo self-assembly process through various noncovalent forces such as hydrophobic and hydrophilic interactions, π-π interaction, electrostatic interactions, hydrogen bonding and microphase segregation, also the shape effects shows a great potential in creating supramolecular structures. In the process of investigating the self-assembly behavior of the synthesized molecules, means of DSC(differential scanning calorimetry), POM(polarizing optical microscope) and SAXS(small angle X-ray scattering) was imported both in the bulk state and liquid-crystalline state.In this paper, Rod-coil molecules, containing cholesteryl unit as an additional factor for self-assembly process as chiral fuctional group, preconceiving an important role in the self-assembly process.Firstly, it was designed as consisting of cholesteryl unit, biphenyl group as rod segment and poly(ethylene oxide)(PEO) with a degree of polymerization (DP) of7,12and17as coil segments. Both three moleculars with different DP revealed phase transition from solid state to liquid-crystalline state upon heating from the DSC experiment. The three molecules self-assemble into lamellar structures in the solid state, while, in the liquid-crystalline phase, self-organize into various columnar nano-structures depending on the volume fraction of PEO coil segments which was revealed both from POM and SAXS.Secondly, it is synthesized that molecular consisting of cholesteryl unit as both coil segment and functional group, and OPV(oligo(p-phenylenevinylene)) as rod segment for supporting the supramolecular during self-assembly process. There was no phase transation from crystal to liquid-crystal phase.Additionally, it was undergone the research on the layered materials of montmorillonites (MMTs) for removing the cyanobacteria. In this paper, toxic Anabaena flos-aquae cyanobacteria were efficiently removed by flocculating with clay montmorillonites (MMTs). Their flocculating activities were determined to be higher than80%even at such a lower concentration of0.08g/L.According to the flocculation kinetic studies, an equilibrium up to65%of removal could be reached within a30min retention time without any shaking, when the clay loading dosage was around0.02g/L at the extreme level alert of harmful algal bloom (1,000,000cells/mL).