[en] ZnO-branched nanostructures have recently attracted considerable attention due to their rich architectures and promising applications in the field of optoelectronics. Contrary to n-type semiconducting metal oxides, cupric oxide is a p-type semiconductor which can be applied to high-critical-temperature superconductors, photovoltaic materials, field emission, and catalysis. We report the synthesis of the ZnO nanorods on the CuO nanofibers prepared by using the electrospinning method along with the hydrothermal method. As the growing time increases, emission spectra of the hetero-structured ZnO/CuO show that the observed band in the UV region is slightly increased, while the intensity of the green emission is highly enhanced. The hetero-structured ZnO/CuO is found to be a promising candidate for developing renewable devices with photoluminescent behavior and the increased surface to volume ratio.

[en] We have prepared ZnO nanofibers by using the electrospinning method and have analyzed the variations in their structure, optical properties, and chemical bonding states with the annealing temperature and the annealing conditions. After annealing at 500 .deg. C, the average diameter and the average grain size are determined to be approximately 170 nm and 50 nm, respectively. The ZnO nanofibers have a clearly visible dislocation-free crystal structure. The 2p level of Zn caused Zn-O bonds and the O 1s core level caused physisorbed O₂. When the nanofibers are annealed at 700 deg C, both ions exhibit shifts of the binding energies compared with those annealed at 500 .deg. C. The observed band in the visible region shows a strong temperature dependence and a red-shift with the oxygen flow in annealing process, which is related to oxygen vacancies.

[en] In summary, we demonstrated enantiomer separation of N-FMOC α-amino acids on coated cellulose derived CSPs, Chiralcel OJ-H and Chiralcel OD-H under both normal and reversed-phase conditions. Although the separation factors for resolution of N-FMOC α-amino acids in reverse mode are generally lower than those in normal mode, these CSPs can be usefully applied in dual mode, not only normal-phase conditions but also reversed-phase conditions for enantiomer resolution of N-FMOC α-amino acids. In particular, this reversed-phase analytical method using Chiralcel OD-H is expected to be quite useful for determination of the enantiomeric purity of analytical samples in biological matrices of serum or plasma and in asymmetric synthesis using aqueous solvents

[en] Highlights: • A hydrophobic octyl groups were introduced on the surface of silica nanotube with organogels. • The hydrocarbons were derivatized on the outer surface of silica nanotube via TEM image mapping and TOF-SIMS spectroscopy mode. • A synthesis process of derivatizing hydrocarbons on the outer surface of the silica nanotubes has been proposed. • EA, LC and TOF-SIMS analyses were performed to confirm that the organogels remained in the silica nanotubes during the washing process. The chiral 1,2-diphenylethylenediamine derivative that is capable of spontaneous self-assembly was employed as an organogel template to produce a helical mesoporous silica nanotube containing gelators therein by following sol-gel polycondensation of TEOS. The synthesis enabled the successful introduction of the hydrocarbon of octyl silane (hydrophobic functional group) onto the outer surface of the silica nanotube while preserving the hydrophilic silanol (SiOH) group on internal surface of silica nanotube free from the gelators. This synthetic condition consists of a pre-stage of the introduction of a hydrophobic hydrocarbon functional group onto the outer surface of the silica nanotube selectively, and the post-stage washing of the gelators was presented together with a method analyzing the actions of organogels in the respective experimental processes.