Papers by Keyword: Preparation

Abstract: Self-compacting concrete-filled steel tube is different from ordinary self-compacting concrete in many aspects. According to the demands of on-site construction conditions and construction technology of continuous pumping lift-up method for the project of Huaxi No.1 steel tube arch bridge, property requirements of self-compacting concrete filled steel tube were proposed in this paper. By using the preparation techniques such as optimization of basic parameters of concrete mix proportion, admixture composition and mineral admixture addition, self-compacting concrete filled steel tube was prepared with the properties such as initial slump more than 24cm, initial slump flow above 650mm, T₅₀ between 5s and 15s, no slump loss for 4h, no bleeding, strength grade above C60 and shrinkage-compensation etc. It was applied in the steel tube arch bridge project successfully using the construction technology of pumping lift-up method.

Abstract: In this article, new tussah silk fibroin films with nano-TiB₂ were prepared. The composite films were characterized by SEM、DSC、TG、XRD and IR. The experiment showed that the nano-TiB2 particle was dispersed in the regenerated silk fibroin. DSC revealed that the Tm of the composite films were increased TG showed stability of the composite films could be increased also. XRD showed the conformation of the composite films changed from typical silk I to typical silk II .The experiment of IR showed that these conclusions were right.

Abstract: Research the electrical conductivity, tensile strength, elongation and microstructure of Cu-2.3Ni-0.24Si alloy in as-cast, hot rolled plate, solution treatment plate, cold rolled strip, and aging treatment strip. the results show that hot rolled at 870°C×1h, solution treatment at 850°C×1h, following 87% cold-rolled, and than aging treatment at 450°C×1h, the tensile strength, elongation and electrical conductivity are 519MPa, 8%, and 45% IACS respectively.

Abstract: Apple-roxburgh rose dregs are rich in insoluble dietary fiber. To prepare the granular insoluble dietary fiber from the dregs by chemical method, single-factor experiments were carried out considering such factors as the ratio of solution and dregs,the size of the dregs,NaOH concentration,the extraction temperature and time. The optimal extractions conditions were obtained by L9(34) orthogonal methodology considering such factors as the size of the dregs,NaOH concentration,the extraction temperature and time, and they were as follows:fresh dregs were extracted by 70%(v/v) at 60°C for 15 min, then dregs were dried at 70°C and powdered, dregs were sifted through 60-mesh sieve and the soluble pectin was get rid of by slight acid solution. Dregs were sifted through 40-mesh sieve and mixed with 1.0mol/L NaOH solution at the ratio of 5∶1, the mixture was kept at 60°C for 3.0h. At last, dregs were dried and powdered. The granular insoluble dietary fiber was thus prepared with the yield of 83.7%. The water holding capability and hydration capability of finished granular product are 17.0 gram water and 4.3 ml per gram product, respectively. Preparation of granular insoluble dietary fiber from apple-roxburgh rose dregs is practiced and there is a few literatures concerning this research.

Abstract: The silica-based mesoporous materials were synthesized under normal atmospheric with Cetyl trimethyl ammonium bromide(CTAB) as surfactant, TEOS as silica source and hydrochloric acid as activator. The pore sizes distribution of mesoporous materials were adjusted by organic assistant reagent TMB(1,3,5-three toluol).The materials after and before TMB addition were characterized through XRD and IR. The results showed that the materials have regular hexagonal mesoporous structure. The structure is more regular and pore size is more bigger after TMB added.

Abstract: The crystals of nickel acetate tetrahydrate have been obtained in the existence of 4-amino-2-methylquinoline. The crystal structure of the nickel acetate tetrahydrate was determined by X-ray single crystal diffraction analysis. The crystal data for nickel acetate tetrahydrate: monoclinic, space group P2(1)/c, a = 0.48319(9) nm, b = 1.1900(2) nm, c = 0.85531(17) nm, V = 0.49064(16) nm3, Z=2, M r= 248.86, De = 1.685 g/cm3, T = 298(2) K, F (000) = 260, R = 0.0756 and wR = 0.1662. The complex forms three-dimensional network structure through hydrogen bonds.

Abstract: The Polygonum Cuspidatum Sieb.et Zucc natural pigments were extracted and compounded with PBS in this paper. The performances of the pigment and the dyed films were studied. The results showed that: both the natural pigment and the dyed films had good thermal stability. Under the acidic conditions, the absorbance of the pigment changed little. The effect to the dyed films by pH indicated the pigments dissolved out of PBS with the degradation. The antibacterial evaluation demonstrated that the natural pigments had good inhibition against Staphylococcus aureus and Escherichia coli. The antibacterial properties of the films were not obvious, but it also revealed that the pigment and PBS had the good compatibility.

Abstract: This paper proposes a idea of microfibril preparation with physical methods. Through the design of wedge structure of experiment table and with the condition of the dynamic pressure jet putting the soften the micro wood fibers to cell wall by squeezing and shearing and torsion and so on and forming the microfibril test specimen. This paper describes the development of foreign microibrils of the status, pointing out the significance of microfibril preparation and application prospects. And to develop the corresponding technical route and to analyze the feasibility of microfibril preparation.

Abstract: Geopolymers are man-made aluminosilicate materials with many exceptional properties. The preparation of geopolymer, using SDRMS as main raw material, lime (CaO) and gypsum (CaSO4ּ2H2O) as activators in analytical grade, was carried out, and the hydration products of which were characterized by XRD and SEM simultaneously in this study. The results revealed that compressive strength of geopolymer paste obtained by the combined excitation of lime and gypsum, was higher than that obtained by only excitation of lime. The former was in the range of 46-70 MPa, the latter was 5–28 MPa after 28d maintenance of geopolymer paste. The highest strength of 70MPa was obtained when the weight ratio of SDRMS/ lime/ gypsum was at 70:20:10 in the geopolymer paste. By the combined excitation of lime and gypsum, the SiO2 and Al2O3 in SDRMS were changed into the hydrates of ettringite, gismondine, killalaite and other based on XRD, which were observed with the acupuncture-like, fibrous, tabular and dendritic microstructure based on SEM.

Abstract: To explore the preparation method and characters of a new gold nanoshells on maganese-zinc ferrite (Mn_o.5Zn_o.5Fe₂O₄@Au) composite nanoparticles. Mn_o.5Zn_o.5Fe₂O₄@Au nanoparticles with core/shell structure were synthesized by reduction of Au³⁺ with trisodium citrate in the presence of Mn_o.5Zn_o.5Fe₂O₄ magnetic nanoparticles (MZF-NPs) prepared by improved co-preciption with the character of superparamagnetism and detected by transmission electron microscopy (TEM), scanning electron microscopy (SEM), x-ray diffraction (XRD), energy dispersive spectrometry (EDS) and Marven laser particle size analyzer.Thermodynamic test was used to observe temperature change of various doses of Mn_o.5Zn_o.5Fe₂O₄@Au nanoparticles. The cytotoxicity of the Mn_o.5Zn_o.5Fe₂O₄@Au composite nanoparticles in vitro was tested by the MTT assay. The therapeutic effect of Mn_o.5Zn_o.5Fe₂O₄@Au composite nanoparticles combined with magnetic fluid hyperthermia (MFH) on human glioma cells were evaluated in vitro by an MTT assay.The results indicated that the Mn_o.5Zn_o.5Fe₂O₄@Au composite nanoparticles were prepared successfully. The core/shell particles were spherical with exact average diameter of them was 66.9nm.EDS showed each Mn_o.5Zn_o.5Fe₂O₄@Au nanoparticle contained Mn, Zn, Fe, O and Au elements, and this proved Au had successfully attached to Mn_0.5Zn_0.5Fe₂O₄.The result of thermodynamic test showed that Mn_o.5Zn_o.5Fe₂O₄@Au composite nanoparticles could serve as a heating source under alternating magnetic field (AMF) exposure leading to reach their steady temperature (40-45°C). Moreover, Mn_o.5Zn_o.5Fe₂O₄@Au composite nanoparticles didn’t show cytotoxicity in vitro. The therapeutic result reveals that Mn_o.5Zn_o.5Fe₂O₄@Au composite nanoparticles can significantly inhibit the growth of glioma cells.The conclusion was that the self-prepared Mn_o.5Zn_o.5Fe₂O₄@Au composite nanoparticles had strong magnetic responsiveness and good power absorption capabilities in the high frequency AMF,then they could suggested to be useful for glioma hyperthemia. Mn_o.5Zn_o.5Fe₂O₄ @Au composite nanoparticles can not only be directed to tumor region in a given magnetic field more exactly but also produce marked thermotherapy.