Preparation of CS-CMC Bipolar Membrane and its Application in Electro-generated FeO4^2-

CS-CMC bipolar membrane was prepared and the cross-section photograph of CS-CMC BM was observed by SEM. FT-IR spectrum indicated that CS-CMC BM contained -N=CRH2 and -COO- functional groups. The charge density of -N=CRH2 in CS membrane was about 14.13 mmol/g and the charge density of -COO- in CMC membrane was about 9.01 mmol/g. The electrochemistry properties of CS-CMC BM were also studied. CS-CMC BM not only can effectively stop FeO4 from diffusing into the cathode chamber, but also plays an important role in the supply of OH- consumed during the electro-generated FeO42- process.     

Preparation of nanometer FeCuP alloy and its application in decomposition of PH3

A new ternary Fe-based alloy catalyst FeCuP applied to decompose PH_3 was prepared with low-cost material by chemical reduction deposition method.The properties of it were characterized by XRD,ICP and SEM.Its catalytic activity on the decomposition of PH_3 and the decomposition conditions were studied.FeCuP alloy exhibits high thermal stabilities and high catalytic activity.Using it as catalyst,the decomposition temperature of phosphine decreases from over 800℃to 400-500℃.The decomposition rate of phosphine achieved 100%.     

Preparation of PLL-PEG-PLL and its application to DNA encapsulation

With the successful sequencing of Human Genome, it would be possible to cure all diseases by gene ther- apy in the near future. However, one of the major problems in gene therapy is the development of gene vectors. To date, there are two kinds of gene vectors, namely, viral and non-viral gene vectors. Viruses are widely used as vectors in gene therapy, with the trans- fection efficiency being relatively high, but they have the safety problems such as immunogenicity, non- biocompatibility and …     

Preparation and application in oil–water separation of ZrO2/α-Al2O3 MF membrane

The composite tubular membranes were prepared by applying suspensions of zirconia particles to form separation top-layers on two different porous α-alumina supports and heating the coated supports to partly sinter the particles of top-layers. The conditions of synthesizing the ZrO₂/α-Al₂O₃ membranes were investigated systematically. The mean pore diameter of zirconia membrane was about 0.2 μm by gas bubble pressure method, and the pure water flux was about 400 and 1500 l/(m² h bar) for ZrO₂ membrane on symmetric and asymmetric Al₂O₃ support, respectively. Zirconia membrane and three different alumina membranes were applied to separate oil–water emulsion obtained from steelworks to evaluate the permeability and separation characteristics, the ZrO₂/α-Al₂O₃ MF membrane in this work was the preferred membrane.     

Preparation of γ-Al_2O_3 composite membrane and examination of membrane defects

A boehmite sol with a narrow particle size distribution and most probable diameter of 35 nm was prepared by peptization of boehmite suspension with HNO3 An unsupported γ-Al2O3 membrane made from the above sol possessed a narrow pore size distribution,with an average pore size of 4.8 nm and 320 m2/g specific surface area.A supported y-Al2O3 membrane produced by repeating dipping-drying-calcination procedure twice was proven to be defect-free by gas permeation measurements and SEM.     

C4−H alkoxylation of 6-bromoindole and its application to the synthesis of breitfussin B

Subjecting 6-bromoindole to an iridium-catalysed triborylation-diprotodeborylation sequence followed by Chan-Evans-Lam coupling gives 6-bromo-4-methoxyindole in good overall yield. This indole C4?H alkoxylation process was used in a formal synthesis of the natural product breitfussin B.     

Preparation of erythromycin imprinted polymer by metal-free visible-light–induced ATRP and its application in sensor

Journal of Solid State Electrochemistry - Erythromycin (ERY) molecular imprinted polymer was prepared on the surface of Au electrode modified with Ni and Au nanoclusters (MIP/AuNCs/Ni/Au) via...     

Preparation and application of streptavidin magnetic particles

Two kinds of streptavidin magnetic particles,namely streptavidin GoldMag particles and streptavidin amino terminal particles were prepared by the methods of physical adsorption and covalent interaction respectively.The streptavidin coated on magnetic particle surface,crucial to many applications,was greatly influenced by the choice of the different buffer.Compared with DynalbeadsM-270 streptavidin, the binding capacity for biotin of different streptavidin magnetic particles was determined by enzyme inhibition method,and the coupling capacity and activity of biotinylated oligonucleotide on their sur- face were also analyzed.The results indicated that the streptavidin GoldMag particle prepared by physical adsorption was stable in STE(NaCl-Tris-EDTA)buffer that was frequently used in nucleic acid hybridization and detection.The streptavidin amino terminal particles prepared by covalent interaction could be used both in STE buffer and PBS(phosphate buffered saline)buffer.The biotin binding ca- pacity for 1 mg of streptavidin GoldMag particles and streptavidin amino terminal particles was 4950 and 5115 pmol respectively.The capacity of biotinylated oligonucleotide(24 bp)coupled on 1 mg of GoldMag and amino terminal magnetic particles was 2839 and 2978 pmol separately.These data were about 6-7 times higher than those of DynabeadsM-270 streptavidin.The hybridization results with FITC-labeled complementary probe on magnetic particle surface demonstrated that the oligonucleotide coupled on streptavidin magnetic particles had high biological activity.     

Weakly bound oxygen and its role in stability of solid solutions La1−x Sr x FeO3−δ

In the present study high-temperature X-ray diffraction, thermal analysis, and mass-spectrometry have been employed for investigation of samples in the La_1?x Sr _x FeO_3?δ family (0 ≤ x ≤ 1), the materials being solid solutions having perovskite structure. It has been shown that the loss of oxygen by the samples on heating to 1200°C in air (0 ≤ x ≤ 1) or in vacuum (x < 0.75) does not result in structural rearrangement of the solid solutions, but causes an increase in the lattice parameters. Heating of the compositions with x ≥ 0.75 in vacuum affords phases with ordered vacancies. The observed structural evolutions (growth of the unit cell parameter and vacancy ordering) are reversible, and on re-oxidation (on cooling in air or additional heating of the “vacuum” samples in air atmosphere) the original parameters of the oxides are recovered. The amount of oxygen evolved on heating increases in vacuum or in helium atmosphere, as compared to air, and also grows with rising strontium content, but under experimental conditions does not reach the maximum possible value (δ = x/2).     

Preparation of BaCe0.8Gd0.2O3−δ by the citrate method and its application in the synthesis of ammonia at atmospheric pressure

BaCe_0.8Gd_0.2O_3– is a kind of high-temperature proton conductor. A precursor of BaCe_0.8Gd_0.2O_3– solid electrolyte was synthesized by the citrate method and characterized by thermal analysis (thermogravimetric analysis–differential thermal analysis), X-ray diffraction and scanning electron microscopy. Using the sintered samples as a solid electrolyte and silver–palladium alloy as electrodes, we synthesized ammonia from nitrogen and hydrogen at atmospheric pressure in the solid-state proton-conducting-cell reactor. The rate of evolution of ammonia was up to 3.09×10^–9 mol s^–1 cm^–2.     

Preparation of magnetite and its decomposition of water

The optimum conditions were studied for the formation of magnetite by the air oxidation of Fe(OH)2 suspensions. The cation-deficient magnetite (Fe3-δO4, δ>0) was obtained by the air (200mL/min) oxidation of Fe(OH)2 suspensions for 8- 25 h at 343 -358 K and NaOH/FeSO4=2.0 (mole ratio). The oxygen-deficient magnetite (Fe3+δO4, δ>0) was prepared through CO gas reduction of the cation-deficient magnetite at 563 K and its stableness at various temperatures and atomspheres was surveyed. The activity of decomposing water into hydrogen gas with oxygen-deficient magnetite at 563 K was studied and its relations to the oxygen-deficient degree and reaction temperature were investigated, respectively. The results show that the longer the time for magnetite being reduced by carbon monoxide, the higher the oxygen-deficient degree, and the more active its dedcomposition of water is. After reaction, oxygen (O2-) was taken away from water by oxygen-deficient magnetite, which converted to the cation-deficient magnetit     

Preparation of Functional Magnetic Nanoparticles and its Application in Diagnostic Analysis

The magnetic nanoparticles modified with carboxyl functional group were synthesized and characterized. These nanoparticles covalently bound with hepatitis B surface antibody（HBsAb）, were used to detect hepatitis B surface antigen （HBsAg） in immunovoltammetry. The detection limit was found to be 0.06 ng/mL, which is much higher than that of enzyme-linked immunosorbent assay （ELISA） used in clinical analysis.     

A highly selective diarylethene chemosensor for dual channel recognition of CN− and Zn2+ and its application

A novel diarylethene chemosensor comprising 3-aminobenzofuran-2-carboxamide Schiff base (1O) was synthesized and the photophysical and sensing behaviors of 1O were further investigated. Importantly, the introduction of electron-withdrawing group to 1O made the sensor an efficient tool for detection of toxic cyanide even in the presence of other plausible interfering anions including fluoride and acetate. In particular, addition of CN^? to 1O visibly changes the color from colorless to orange-red, which can be observed by the naked eye. Apart from this, it also exhibited an outstanding fluorometric sensing toward Zn²⁺ with high selectivity and sensitivity. Moreover, the remarkable spectral responses of the devised sensor prompted us to fabricate molecular logic circuit. Furthermore, the sensor was successfully applied to the detection of CN^? on test strips and silica coated microslides, and the methods were very simple to operate without resorting to any spectroscopic instrumentation. In addition, the 1O can also effectively detect CN^? and Zn²⁺ in actual water samples.     

Preparation and Properties of MoO3−TiO2−SiO2 Composites with Spherical Shape of Agglomerates

Russian Journal of Applied Chemistry - MoO3?TiO2?SiO2 composites with spherical shape of agglomerates were prepared by thermal decomposition of TOKEM-400 and TOKEM-840 anion-exchange...     

Preparation of polyacrylamide based monolith with immobilized pH gradient and its application for protein analysis

Monolithic materials were prepared in capillaries by in situ polymerization of acrylamide, glycidyl methacrylate and N,N′-memylenebisacrylamid in the presence of trinary porogens, including 1,4-butanediol, dodecanol and dimethyl sulphoxide. With Ampholine immobilized on the monolith by chemical bonding according to their pIs, the monolithic immobilized pH gradient (M-IPG) was prepared, and applied to the separation of four standard proteins. Compared with polyacrylate based M-IPG, the hydrophilicity of the new material was improved. It could not only avoid the adsorption of proteins, but also make the synthesized procedure simple, which showed great potential in the analysis of proteins.     

Electro-generation of TGA by Ni-mSA-mCS bipolar membrane

Ni-mSA-mCS bipolar membrane (BM) was prepared by sodium alginate (SA) and chitosan (CS),which were modified by Ca~(2 ) and glutaraldehyde as linking reagents,respectively,mSA-mCS membrane was characterized by FTIR,SEM,TG and used as a separator in the electrolysis cell to produce thioglycolic acid (TGA).The experiment results show that TGA was prepared effectively by electro-reduction of dithiodiglycolic acid (DTDGA) with the mixture of TGA and DTDGA in the cathodic chamber.The current efficiency was up to 66.7% at the room temperature (25℃) during the current density of 10 mA/cm~2.Compared with the traditional metal reduction method,the electro-reduction technology saves the zinc powder and eliminates the pollution to environment. (?)2007 Zhen Chen.Published by Elsevier B.V.on behalf of Chinese Chemical Society.All rights reserved.     

Preparation of magnetically recoverable Fe3O4–graphene oxide catalyst by green method and its application for reduction of nitropyrimidine in aqueous medium

Research on Chemical Intermediates - Magnetic graphene oxide (GO)/amino-functionalized Fe3O4 nanocomposite was prepared using tannic acid as binder. For this purpose, Fe3O4 nanoparticles were...     

Preparation of CdS–TiO2/Fe3O4 photocatalyst and its photocatalytic properties

The CdS modified TiO₂/Fe₃O₄ photocatalysts were prepared by sol–gel and immersion methods. The morphological, structural and optical properties of as-prepared samples were characterized by X-ray diffraction (XRD), UV–Vis absorption spectra, X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM). The TEM observation showed that the surface of magnetite particles (Fe₃O₄) were coated by CdS–TiO₂ layer as loose clusters, and average diameter of composites particles was about 250 nm. UV–Vis absorption spectra indicated that CdS–TiO₂/Fe₃O₄ composites had pronounced red-shift compared with that of TiO₂/Fe₃O₄. The CdS–TiO₂/Fe₃O₄ composites exhibit higher photocatalytic activity than pure TiO₂ and TiO₂/Fe₃O₄ for the degradation of Reactive Brilliant Red X-3B dye (X-3B) aqueous solution under simulated sunlight, and the optimum content of CdS is 1.0 % (mol ratio of CdS to TiO₂). In addition, a gradual loss of photocatalytic activity can be observed in reusability test of CdS–TiO₂/Fe₃O₄ composites, and degradation of X-3B reached still to 78.9 % after five runs.