Advanced Materials Research Vols. 236-238

Abstract: TiO₂ were doped with MgO by thermal hydrolysis, The photoelectrochemical properties of the 1%MgO-doped TiO₂ film matched with organic dye TH305 were better than those of the anatase TiO₂ film. The conduction band of the MgO doped nanostructured TiO₂ synthesized negatively shifted by 60 mV, compared to that of undoped TiO₂.

Abstract: The hexagonal mesoporous silica (HMS) nano-particles were prepared in mixture of 1-butyl-3-methyl-imidazolium tetrafluoroborate (BMIM⁺BF₄^-) ionic liquid and water by a sol-gel method. The structure and morphology of obtained materials were characterized by X-ray powder diffraction (XRD), N₂ adsorption-desorption, scanning electron microscopy (SEM), transmission electron microscopy (TEM) and dynamic light scattering (DLS). The influence of the amount of BMIM⁺BF₄^- was investigated. It was shown that the synthesized materials have discrete and uniform spherical morphology with the size in the range of 68-177 nm (obtained from DLS measurements), and the particle size of HMS can be controlled by varying the amount of BMIM⁺BF₄^-.

Abstract: The microwave method was used to extract Lachnum calyculiforme polysaccharides (LCP). By orthogonal experiments, the optimal conditions of extraction were the microwave temperature was 120 °C, extraction time was 20 min, ratio of water to raw material was 60:1, and the yield of polysaccharides was 12.56 %. LCP-1 was separated and sequentially purified from LCP through Sephadex G-100 column chromatography, which was detected as the homogeneous component. LCP -1 had strong scavenging abilities on O2ˉ•, •OH and DPPH free radicals.

Abstract: First, a FD scheme based on a polar-coordinate diffusion optimization problem is derived. Next, an optimization algorithm to compute the partial derivatives is proposed. Third, the procedure for the time-dependent drug diffusion parameters is given. Finally, the numerical result shows the validity of the optimal method based on FD to extract the effective time-dependent drug diffusivity.

Abstract: The synthesis of nano-scale hydroxyapatite (HAp) could be achieved by using carbon nanofibers (CNFs) as templates. It was shown that both silica fiber and alumina fiber are suitable substrates for the growth of CNFs templates by chemical vapor deposition (CVD) technique. It turned out that the resulting CNFs could act as promising and effective templates for nano-scale deposition of HAp on the fiber surface. However, CNFs obtained from silica fiber performed better than those grown from alumina fiber for uniform deposition of HAp on the surface.

Abstract: The pulse electro-deposition (PED) has been successfully applied for fabricating nanocomposite layers on the surface of steel substrates. The Ni-AlN nanocomposite layers were fabricated by mixing a given amount of AlN particles in electrolyte ultrasonically. The composition and surface morphology of the layers were investigated by means of XRD and SEM. The results showed that the Ni-AlN nanocomposite layers consisting of nickel grains (~68.27 nm) and AlN nanoparticles (~38.46 nm) had been obtained on the surface of steel substrates by PED. The Ni-AlN layer exhibited a compact surface morphology in micro-regions, and the grain sizes in the Ni layer were greater than that in the Ni-AlN nanocomposite layer.

Abstract: MoO₃ nanorods were synthesized by a solution method with stirring and ultrasound. The formation temperature of MoO₃ nanorods were studied by XRD. The particle-size and morphology were characterized by TEM. The diameter of nanorods was ca. 60nm.

Abstract: Molecular film displacement is a new nanofilm EOR technique. A large number of experiments show that the mechanism of molecular film displacement is different from conventional chemical displacement (polymer, surfactant, alkali and ASP displacement etc). With water solution acting as transfer medium, molecules of the filming agent develop the force to form films through electrostatic interaction, with efficient molecules deposited on the negatively charged rock surface to form ultrathin films at nanometer scale. This change the properties of reservoir surface and the interaction condition with crude oil, making the oil easily be displaced as the pores swept by the injected fluid. Thus oil recovery is enhanced. The mechanism of molecular filming agent mainly includes absorption, wettability alteration, diffusion and capillary imbibition etc.

Abstract: Mesoporous silica sphere (MSS) with switchable gates was prepared by the graft of pH-sensitive propyldiethylenetriamine groups (multiamine chains) around mesopore outlets. The textural parameters of the resultant material had been analyzed. In the following test of in vitro drug release, the gated mesoporous material showed high response to solution pH. At high pH (pH 7.5), ibuprofen (IBU) that loaded in this carrier released rapidly and completely (within 2 h); at low pH (pH 4.0 or 5.0), only a small part of the IBU (13 wt%) was slowly released from this carrier and the most of IBU was effectively confined in mesopores.

Abstract: A rapid and simple antibody purification method is reported for the isolation of monoclonal antibody IgG1 from SARS-CoV N protein rabbit serum by using surface-modified magnetic beads. First magnetic poly (methacrylate-divinylbenzene) (PMA-DVB) beads were prepared and modified with aldehyde end group through surface chemical reactions. Then protein A were covalently bound to aldehyde-activated magnetic beads and further used to purify monoclonal antibody IgG1 from rabbit serum directly. This rapid magnetic carrier technology proves to be efficient and rapid for antibody purification and has potential to massive production of monoclonal antibody.