15 February 2015, Volume 46 Issue 03
    

  • Select all
    |
    研究 开发
  • Effect of oxygen and moisture on the electronic properties of carbon nanotube fibers
    Wei-Mo ZHANG
    . 2015, 46(03): 1-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Carbon-nanotube (CNT) has great advantages on the adsorption of gas and liquid for its special hollow structure and high?specific surface area. Electronic properties of CNTs fibers are related to the concentration of oxygen and moisture during the adsorption and desorption process under different conditions. CNTs fibers have greater adsorption to moisture than to oxygen at room temperature; the adsorption moisture increases the number of hydroxyl group and decreases the holes number of the CNTs fibers surface, resulting in the decrease of conductivity of CNTs fibers. At High Temperature, CNTs fibers prone to oxygen desorption, and that leads to its resistance increase. Arc experimental results also show that CNTs fibers can produce intensive electric arc accompanied with great energy at low voltage (≤30V) and corresponding current （＜２A）,and that show the great application prospect of CNTs fibers in electric arc industry.
    • 综述 进展
  • Research progress in electromagnetic shielding materials
    ;zhang dong
    . 2015, 46(03): 2-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    With the deterioration of electromagnetic environment, it is quite urgent to explore a range of effective electromagnetic shielding materials in the field of material development. In this paper, the mechanism and normal measurements were simply introduced, and according to classification of metal and conducting polymer materials, advances in preparation and application of electromagnetic shielding materials were reviewed, what’s more, further developments of electromagnetic shielding materials were also proposed.
  • Development of polymeric solvent-resistant nanofiltration membranes
    . 2015, 46(03): 3-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Polymeric nanofiltration membrane，a kind of pressure driven membrane which has pore-size less than 2 nm, has recently attracted great attention in non-aqueous applications. Therefore, the requirements of solvent-resistant for these membranes are stricter. In this paper, the progresses of membrane preparation methods such as phase inversion, interfacial polymerization and layer-by-layer self assembly etc., separation mechanisms and applications of the polymeric solvent-resistant nanofiltration membranes were reviewed. The future research works on these membranes were also proposed in this paper.
    • 研究 开发
  • Effects of Methanol and Glutaraldehyde on Properties of Silk Fibroin/Gelatin Porous Scaffolds
    ;Peng PENG;;;;;
    . 2015, 46(03): 4-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    This paper compares the effects of methanol and glutaraldehyde on properties of silk fibroin/gelatin composite porous scaffolds, the silk fibroin/gelatin composite porous scaffolds with equal proportion were prepared by freeze-drying method, cross-linked by methanol and glutaraldehyde respectively. Microstructures of scaffolds were observed; porosities,water absorption ratios and swelling ratios were measured; thermal stabilities and mechanical properties were investigated. Then differences of scaffolds, structures and properties by different cross linking agents were compared. Results showed that scaffolds cross-linked by glutaraldehyde had a more regular, uniform pore distribution, higher porosities, water absorption ratios, swelling ratios and mechanical properties. Glutaraldehyde-crosslinked silk fibroin/gelatin composite porous scaffolds, properties are more excellent.
  • Study on the preparation of Cu2ZnSnS4 nanoparticles and films by microwave irradiation assisted solvothermal method
    Wei WANG; ;
    . 2015, 46(03): 5-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    In this paper, Cu2ZnSnS4 (CZTS) nanoparticles were synthesized with ethylene glycol as solvent and thioacetamide as sulfur source by microwave irradiation assisted solvothermal method. The structure, shape, composition and optical properties of as-synthesized CZTS nanoparticles were investigated with X-ray diffraction, Raman spectroscopy, scanning electron microscopy, energy dispersive spectrometer and UV-vis-NIR spectroscopy. The results show that the as-synthesized nanoparticles have kesterite structure and stoichiometric composition. The average size of the CZTS nanoparticles is about 3.4 nm. And the band gap of CZTS nanoparticles is 1.85 eV, which shows an apparent band gap blue-shift due to the quantum size effect. CZTS ink was formed from CZTS nanoparticles and then CZTS thin films were on glass substrates by drop casting (ink-print method). The results of XRD and SEM from the CZTS thin films show the as-prepared CZTS thin film has a good crystalline and the surface is compact. The CZTS thin film has an obvious photoconductive effect by I-V test under light illumination and darkness.
    • 工艺 技术
  • Facile synthesis and photoluminescence properties of MoO3 micro-sheets
    Ming-Long ZHONG
    . 2015, 46(03): 6-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Single-crystalline lamellar α-MoO3 micro-sheets were synthesized on ITO glass substrates by a simple thermal evaporation method. The micro-sheets with a length and a width of 100 μm and 1~5 μm, were composed of nanosized layers with thickness about 100 nm. The common vapor-solid (VS) mechanism is adopted for the growth of lamellar α-MoO3 micro-sheets, which grow along [001] direction. The room temperature photoluminescence (PL) properties of the α-MoO3 micro-sheets were investigated. The emission intensity increased with deposition temperature increases due to the increasing defect density for the micro/nanostructures.
  • Preparation and characterizations of Graphene Oxide Nanoribbons/TPU Composite Films
    Zhi-Min FAN;Yu -Ying ZHENG ;
    . 2015, 46(03): 7-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    The graphene oxide nanoribbons were prepared by oxidation longitudinal cutting carbon nanotubes, and the graphene oxide nanoribbons/ thermoplastic polyurethane composite films were fabricated by solution on the coating machine . FT-IR, Raman, XRD, FE-SEM, TEM results showed that the carbon nanotubes had been successfully cut into graphene oxide nanoribbons of banded structure. Mechanical properties showed that when the content of graphene oxide nanoribbons was 2 wt%, the elastic modulus and tensile strength of composite film increased by 160% and 123%, compared with the pure TPU film. The oxygen transmission rate of TPU film declined by about 77％ at low graphene oxide nanoribbons loading of 2.0 wt％, and the barrier properties has improved significantly.
    • 综述 进展
  • Adsorption properties of graphene and its composites for heavy metal ions in aqueous solution
    ; Jie MA
    . 2015, 46(03): 8-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Graphene is a new type of carbon nanomaterials, which has unique physical and chemical properties, including high mechanical strength, good stability, strong superficial chemical activity and large surface area. These characteristics make graphene be a unique adsorption material. This article mainly summarized the synthesis of graphene and graphene composites. Moreover, the main research progress and adsorption mechanism for the removal of heavy metal ions from water were all summarized. Finally, the further research directions of graphene were prospected.
    • 工艺 技术
  • Preparation and upconversion luminescence properties of Yb3+/Tm3+ codoped (Ba, Sr)TiO3 ferroelectric thick films
    . 2015, 46(03): 9-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    The Yb3+/Tm3+ co-doped BST thick films were prepared by screen printing process on alumina substrates. The effect of rare earth ions doping on the microstructure and photoluminescence properties were investigated. It was found that Tm3+ and Yb3+ ions substituted for B site ions when the concentration was small. The RE ions can substitute both A site and B site with increasing RE ions concentration. The PL spectra of the Yb、Tm co-doped BST thick films were measured with 800 nm excitation source at room temperature. The 468 nm blue up-conversion luminescence was assigned to 1G4→3H6 transition of the Tm3+, and the 533 nm green up-conversion luminescence was assigned to 1D2→3F4 transition of the Tm3+ with the sensitization of Yb3+. The intensity of the 468 nm luminescence peeks first became stronger then decreased as increasing the ratio of the Yb3+ and Tm3+, the luminescence intensity reached the maximum at the ratio of 2:1 for Yb3+ and Tm3+. The mechanism of indirect up-conversion luminescence was also studied.
  • Make microspheres through emulsion-solvent evaporation method
    Cai-Yun HE;;
    . 2015, 46(03): 10-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Abstract: In this study, o/w emulsion-solvent evaporation method was used to make microspheres, using dichloromethane as the solvent phase, polylactic acid as the carrier material and vitamin A acid as the entrapped object, tween 80 and gelatine as emulsifier. The technical conditions such as shear speed, shear time, internal, external phase volume ratio and the amount of wall material were determined. The experiments demonstrated that the optimal conditions were: gelatin concentration of 7.5mg/ml, tween concentration of 6mg/ml, polylactic acid concentration of 10mg/ml, inside and outside the phase volume ratio of 1:10, shearing time of 30min, stirring speed of 300r/min, volatile time of 3h. The final product was smooth and well dispersed, and the encapsulation efficiency was 52.42%.
  • The effect of prestress on the properties of lead free KNBT piezoelectric fibers
    ; ;;
    . 2015, 46(03): 11-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Abstract: Lead-free potassium sodium bismuth titanate (K0.2Na0.8)0.5Bi0.5TiO3 (KNBT) fibers were fabricated by viscous plastic processing (VPP) method. Then，the effect of prestress on ferroelectric and field-induced strain properties of KNBT fibers was investigated. The results indicated that KNBT fibers with single phase and dense structure could be obtained via VPP method. Prestress had an influence on remnant polarization, coercive field and strain of fibers to various extents. The maximum strain and remnant strain increased with increasing prestress, whereas the remnant polarization and coercive field keep almost unchanged. Further increasing prestress, the maximum strain, remnant strain, remnant polarization and coercive field were reduced. This can be associated with ferroelastic deformation helping enhance the strain caused by prestress. The non-180? domain switching is constrained by prestress at the same time. Therefore, applying appropriate prestress can not only not affect the ferroelectric properties of KNBT fibers, but also improve its piezoelectric properties.
  • Processes Study on Magnetization Roasting Method to Strengthen Whitening Kaolin by Magnetic Separating Removal Iron Method
    . 2015, 46(03): 12-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    The experiment used magnetic roasting process, took bamboo charcoal powder that was dealt with base activator as magnetic roasting reducing agent. It studied that additive, sintering temperature, and holding time had some effects on mass susceptibility of iron mineral in kaolin. Determined finally the best solution of magnetic roasting process was that it was added 2.0﹪ boric acid and 3.0 ﹪ NaHCO3, its magnetic roasting temperature was about 450℃, its holding time was 30 minutes, and mass susceptibility of iron mineral in kaolin reached 5.58×10-4 m3/kg.To kaolin after treatment of magnetic roasting process, it was necessary to deal with it by wet milling. When the pH value in the slurry system was about 9 and milling time was about 30 minutes. The production rate of magnetic separation was up to 84.4﹪.And this time the Calcined whiteness of magnetic kaolin concentrate (Temperature was 1200℃)was 87.4﹪.It increased by 22.6﹪ than calcined whiteness 71.3﹪ of untreated kaolin sample, it increased by 14.2﹪ than calcined whiteness 76.5﹪ of original kaolin sample.
  • Microstructure and shape memory property of Ti containning iron-based shape memory alloys prepared with melt spinning
    Wei CHEN;;;;
    . 2015, 46(03): 13-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Abstract: Three kinds of SMAs with different composition (a)Fe-30Mn-6Si, (b)Fe-30Mn-6Si-1Ni, and(c)Fe-30Mn-6Si-1Ni-1Ti were prepared with melt spinning. The microstructure of these alloys were analysed with X-Ray diffraction (XRD), Optical Microscope (OM) and Scanning-Electron Microscope (SEM), the shape recovery strain of the alloys were measured by tensile test. Dendrite spikes appears in Fe-30Mn-6Si, the dendrite arm spacing is about 0.2μm. Equiaxial austenite grains distributed uniformly in Fe-30Mn-6Si-1Ni and Fe-30Mn-6Si-1Ni-1Ti, the grain size in Fe-30Mn-6Si-1Ni-1Ti is bigger. When the pre-strain is 1% and 1.5%, the shape recovery strain of Fe-30Mn-6Si-1Ni is higher than Fe-30Mn-6Si-1Ni-1Ti. When the pre-strain is 2%, the shape recovery strain of Fe-30Mn-6Si-1Ni-1Ti is higher than Fe-30Mn-6Si-1Ni. The Fe-30Mn-6Si-1Ni-1Ti shows the highest shape recovery strain 2% when then pre-strain is 3%.
  • Experimental Investigation on Interface Mechanics of Asphalt Mixture Based on Technology of VIC-3D
    Wang-Lan ;
    . 2015, 46(03): 14-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    In order to study the cracking and the development of crack of asphalt mixture, three point bending of semicircular specimens of SBS asphalt mixture was conducted. Based on digital image correlate, VIC – 3D (Video Image Correlate – 3D) acquisition system and the calculation software was used respectively during the whole damage process of specimens for image acquisition and calculation of displacement field, strain field and the changing rate of them, the cracking and the development of crack were obtained. Then the crack position of specimens was observed using scanning electron microscope and principle of cracking and the development of crack were explained with the help of the analysis of the displacement field and strain field. The results show that: using the horizontal strain variation law with time to explore the trajectory of cracks is reasonable, the fracture of specimens and the development of fracture both occur along the interface of asphalt mortar and coarse aggregate area, and tend to the interface of aggregates which have poor interface. The development rate of fracture related to the thickness of the interface area，so it can be predicted according to a representative value of the thickness of interface layer.
  • Microstructure and Composition of Te-In Alloy Prepared by Near-Rapid Solidification Process
    Jin－Wu HU;;;
    . 2015, 46(03): 15-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    As a kind of evaporation material, Te-In alloy is wildly applied in UV image intensifier. Te-In alloy was prepared with near-rapid solidification rate, in which the mass percent of Te is 75 wt%. Optical Microscopy (OM), energy Dispersive Spectrometer (EDS), X-ray diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscope (TEM) were used to study the microstructure and phase composition. The results show that the crystalline grains of Te-In alloy with near-rapid solidification rate are fine and uniform. The alloy is composed of nonequilibrium In2Te5 primary phase with Te as solute atoms and eutectic structure of Te phase with In as solute atoms and nonequilibrium In2Te5 phase , there were no pure Te and pure In2Te5 in the alloy. The mass fraction of Te in Te phase is 84.2 wt% and that of In is 15.8 wt%.
  • Preparation of Co nanoarrays with hollow sphere structure and its tunable optical properties
    ;;;
    . 2015, 46(03): 16-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Abstracts : Co nanoarrays with Periodic hexagonal structure is prepared by magnetron sputtering technology based on colloidal crystal monolayer templates, the morphology and the optical properties are measured. The optical absorption peak is depended on the geometry parameters of hollow sphere structure: the absorption peak can be tuned in large scale(770~1270nm) by changing the size of hollow sphere, and also fine-adjusted by changing the thickness of hollow sphere. In addition, the size and thickness of hollow sphere can be tuned by selecting suitable colloidal crystal templates (600nm~1000nm) and controlling the time of deposition. This structure and its unique optical properties may have potential applications in optical device, photonic crystal and sensors. Key words: colloidal crystal templates; magnetron sputtering; hollow sphere structure
  • Preparation and Characterization Analyses on the Functionality Fly Ash MicroSphere Cladding Rutile TiO2
    YAN HanDongWang YuFei
    . 2015, 46(03): 17-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    The functionality fly ash microsphere plated rutile TiO2 was prepared by means of the union process of chemical sedimentation and burned of 2h at 900~1000℃ with the matrix of fly ash thick wall microspheres the titanium source of titanium sulfate. The size distribution, chemical composition, surface morphology and structure of un-cladding and cladding microsphere were comparatively analyzed by the characterization techniques of laser particle size analyzer, SEM, XRD, and EDS. The upper surfaces of the cement mortar base plates, which were painted respectively exterior wall coating material adding original microsphere or adding functionality microsphere (20 percent of coating material mass) coating material, were continuously irradiated for 2h under a infrared lamp of 275kw. The temperature of the bottom side of the latter base plate was lower about 1.4℃ than that of the bottom side of the former base plate. This is the consequence of heat reflection effect of rutile TiO2 cladding on the surface of fly ash microsphere.
  • Synthesis and Tribology Performance of Boronation Methyl Oleate containing Nitrogen
    ;
    . 2015, 46(03): 18-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    In this paper, the boric acid ester containing phosphate was synthesized by chemical modification in double bond of methyl oleate molecule. The synthetic product’s chemical structure was characterized by infrared spectroscopy. Four ball friction test machine was adopted to investigate into it’s tribology performance in different base oils, namely the liquid paraffin and rapeseed oil respectively. The results show that, after modification, the anti-wear ability, extreme-pressure performance and anti-friction performance of methyl oleate were improved significantly. With 1.5% additive amount of synthetic product in different base oils, PD reached to 2452N and 1592N, increased 98.38% and 26.94% comparing with methyl oleate, WSD reduced 8.93% and friction coefficient reduced 12.48%. For tribology performance, the perceptibility property of the chemical modification methyl oleate is much better to the rapeseed oil than to the liquid paraffin.
    • 研究 开发
  • Influencing research of low concentration nitrogen pollutants and COD removal by sodium citrate modified zeolite
    . 2015, 46(03): 19-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    The removal efficiency to ammonia nitrogen, nitrate nitrogen, COD and characteristics of Adsorption thermodynamics, kinetics of zeolite modified by sodium citrate was investigated. And using specific surface area and pore analysis, SEM-EDS , XRD and other means to characterize the structure. Results showed that, the synchronous removal efficiency of zeolite modified by sodium citrate to ammonia nitrogen, nitrate nitrogen, COD were 92%,10%,35%,which had respectively increased by 53%，2%，5% as that of the natural zeolite. The adsorption equilibrium data of ammonia nitrogen and COD on sodium citrate modified zeolite fitted well to the Langmuir, nitrate nitrogen fitted well to the Freundlich isotherm models. The adsorption kinetics data of ammonia nitrogen, nitrate nitrogen, COD on modified zeolite could be well described by elovich absorption kinetic equation .The result of EDS demonstrated that Sodium can be loaded on the zeolite, and the average pore width, total pore volume increased after modified sodium citrate. But the crystal structure kept invariant.
  • Effect of Semi-solid heat-treatment on Microstructure and Mechanical Properties of Ti-based Bulk Armorphous Composites
    ;;;;;YUAN Zizhou
    . 2015, 46(03): 20-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Ti-based bulk amorphous composites, designed by deformation induced transformation effect to enhance the strength and plasticity, were fabricated by suspend melting under an argon atmosphere using a Copper mold. And semi-solid heat-treatment was chosen to control the solidification kinetics and optimize the microstructure. The effect of semi-solid heat-treatment on microstructure and mechanical properties of Ti-based bulk amorphous composites were investigated. The results show that the as-cast compounds microstructure are consist of the supercooled austenite phase, thermally-induced martensite phase and amorphous phase. As loading, the alloys are strengthened and toughed by TRIP effect, and exhibit a strongly work-hardening behavior. The as-cast microstructure of core region contains coarse dendrites with uneven growth. Nevertheless, the semi-solid heat-treated microstructure contains equiaxed grain with higher spheroidization, smaller and more uniform size. The spheroidal grain is formed by the sharp corner solution and plane precipitation growth mechanism. Therefore the composites microstructure is effectively optimized, as well as the comprehensive mechanical properties are further improved. After semi-solid heat-treated, fracture strength and plastic deformation of (Ti0.5Ni0.48Co0.02)80 Cu20 are enhanced from 2582MPa and 15%, to 2745MPa and 21.5%.
  • The effect of Zr、Cu elements and rare earth Ce on microstructure and property of the electrical round rod
    . 2015, 46(03): 21-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    The effects of addition of Ce、Cu and Zr(0.06%-0.18%)on microstructure and properties of the aluminum elctrical round rod were investigated usin microstructure analysis、Electrical performance and mechanical properties test.The results of study are showed as follows:the tensile strength of the alminum electrical round rod can be improved when the Cu content is 1.9%,but decreased its conductivity;each performance index was fined remarkably when the Ce content is 0.2%;The Al3Zr phase resulting from addition of Zr to the aluminum elctrical round rod is distributed at the grain boundary,the alloy of high mechanical and thermal properties can be got by adding 0.12% Zr,at the same time,the conductivity of aluminum will not be reduced significantly; The Al3Zr phase and the RE-containing intermetallic compounds in the shape of short shank or coarse granule are joined together,α-Al matrix is pressed into the shape of lamellar,which leading to the reduction of mechanical properties.The research for the improvement of the performance of the aluminum elctrical round rod provides a theoretical basis and New ideas.
  • The Dependant of Electron Injection Ability on Organic Electron Transporter for Cesium Carbonate based Cathode Structure
    Jia-Rong LIAN
    . 2015, 46(03): 22-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    The electron injection ability of cesium carbonate based cathode structure has been studied by changing the organic electron transporters. It is shown that the organic light emitting devices using phenanthroline derivatives perform the largest current characteristics, and that with oxadiazole derivatives show the second large current, both of which exhibit much better electron injection capability than that of Alq3.Further studies indicate that the electron injection ability is irrelevant with energy distribution of each organic materials, thus a different chemical interaction between cesium carbonate and organic materials can be deduced happening at cathode interface, which would differ the electron injection barrier. For the metal chelate complex, the metal cation is expected involving this interfacial interaction because in that an abrupt change in electron injection has been found when changing organic materials from Alq3 to Liq. Here a strong influence on the electron injection ability for cesium carbonate cathode structure has been demonstrated by differing organic materials, which would give a hint for designing a novel organic electron transporter for this kind of cathode structure.
  • The influence of RF power on the solid phase crystallization of a-Si thin films
    Yuanyuan Lu
    . 2015, 46(03): 23-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    A series of amorphous silicon thin films with different order degree have been obtained by PECVD through adjusting RF power firstly and then annealed in vacuum. The microstructure and electrical property of the films have been investigated by XRD, Raman, HRTEM and the minority carrier lifetime tester. With the increase of RF power, the order degree and the minority carrier lifetime increase first and then decrease. After annealing, all of the films are crystalline and both of the crystallinity and grain size increase first and then decrease with RF power. At the same time, the minority carrier lifetime has a significant improvement comparing with that before annealing. The results indicate that in the same condition of thermodynamics, the films with higher order degree are easier to crystallize.
  • Research on Properties on High Temperature Resistance of Basalt Fiber Yarn
    Fu-Zhou LI
    . 2015, 46(03): 24-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    The high temperature resistance and its mechanism were carried out on the basalt fiber yarn produced from a domestic company by a variety of analysis methods. The results show that fracture strength of basalt fiber yarn has a special law of decrease after a first decrease with the increasing of temperature, while, it can obtain the best mechanical properties at 200℃. During the process of heating up, the surface treating agent would have an experience of reunion and decomposition successively, which has an indirect influence on fracture strength by changing surface roughness and the number of loaded fiber of fiber yarn. What’s more, the internal structure of basalt fiber yarn was destroyed at some extent after treated at high temperature.
  • Study on the preparation and photocatalytic activity of Bi2WO6 photocatalyst
    Dan GUOBin-xia ZHAO
    . 2015, 46(03): 25-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Bi2WO6 was synthesized by hydrothermal method using Bi(NO3)3·5H2O and Na2WO4·2H2O as raw materials. The photocatalytic activity of prepared materials was tested by the degradation of Rhodamine B (RhB) solution under visible-light irradiation (λ＞420nm). The effects of pH value of precursor suspensions, reaction temperature and time on the catalytic behavior were investigated. Samples prepared by precursor suspension with different pH were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), UV-visible diffuse-reflection spectroscopy (UV-Vis) and Brunauer-Emmet-Teller method (BET).The results indicated that pH value of precursor suspension was the crucial factor to the photocatalytic activity of Bi2WO6 ,and had a strong influence on its microstructure. The sample prepared by precursor suspension with pH=4.5 obtained the optimal photocatalytic activity (the degradation of RhB was up to 99.90% under 90min irradiation). In addition, the catalytic activity of the catalyst remained constant after 4 runs of the experiment, demonstrating that Bi2WO6 was an efficient and stable visible-light photocatalyst.
  • Cellulose Nanofibers Reinforced Electrospun Nano-fiber Mats Containing Poly(vinyl alcohol) and Waterborne Polyurethane
    ;Zhu LONG
    . 2015, 46(03): 27-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    TEMPO-oxidized cellulose nanofibers (TOCNs) were used as nanofillers for polyvinyl alcohol/ waterborne polyurethane electrospun nano-fiber mats in this work. The reinforcing capability of TOCNs was investigated by tensile tests. SEM, IR, TGA and DSC were also carried out in order to characterize the influence of the cellulose nanofibers on electrospun mats. Scanning electron microscopy results showed that TOCNs were well dispersed in PVA/WPU matrix. The reinforced composites had a ca. 44% increase in their mechanical properties with addition of only 5 wt. % of TOCNs. Moreover, The addition of TOCNs improved the thermal stability of PVA/WPU electrospun mats. Since PVA, WPU and TOCNs are hydrophilic, non-toxic and biocompatible, and therefore, these electrospun nano-fiber mats could be used for tissue scaffolding and wound dressing materials, etc.
  • Fungus fiber/CdS composite fiber materials and their photocatalytic performance
    Gao-Sheng ZHU;;
    . 2015, 46(03): 28-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    In this paper, we firstly used the fungus fiber as a template, and adopted the solvothermal method for preparing the fungus fiber/CdS composites fiber material under different temperature conditions with CdCl2 and thiourea as raw materials. The fungus fiber/CdS composite fiber material that had been obtained was characterized by scanning electron microscopy(SEM), fourier transformed infrared(FTIR), and X-ray diffraction(XRD). The results indicated that the spherical CdS nanoparticles were homogeneous distribution, with the size of the grain was about 20 nm, which were stable in the course of nucleation and grew on the surface of fungus cellulose due to the coordination effect with active group. The investigation of photocatalytic degradation experiment of phenol showed that the phenol photodegradation rate of fungus fiber/CdS composite fiber material prepared under the 150℃ could reach to 99.23%,demonstrating the excellent photocatalytic degradation property.
  • Study on the Electrical Properties of Dye-Sentized Acetylene Black-TiO2 Composite Porous Films Electrode
    Hong-Fang Ma ;;
    . 2015, 46(03): 29-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    TiO2 nano-powder slurry was prepared by P25, and acetylene black (AB)-doped TiO2 (AB-TiO2) composite porous films were fabricated by spin coating method. The films were sensitized by N719 and natural mulberry pigment（MBY） dye-solution, and the dye-sensitized solar cells (DSSCs) were assembled. The DSSCs were tested by electrochemical analyzer. The results showed that AB dopant could improve the transporting rate of photoelectrons, reduce the carrier recombination. The biggest photoelectric conversion efficiency is 9.4a% and 12.5a% when AB-doped is 0.15wt% and 0.2wt% respectively.
  • Reversible oleophobic/philic conversion properties in micro-nano Si-Ti composite coatings under UV irradiation
    ;Tao Meng
    . 2015, 46(03): 30-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    A new type of fluorine modified micro-nano SiO2-TiO2 composite coating has been prepared though a convenient and low-cost method. Field emission scanning electron microscopy (FE-SEM), X-ray photoelectron spectroscopy (XPS) and oil contact angle were used to characterize the composite coatings. The results confirmed the composite coating with repeated and reversible oleophobic/philic conversion properties (90o-24o), which responded to cycles of UV irradiation and dark storage. Such switch can be safety performed during five continuous cycles without apparent attenuation. Compared with the single-scale nanostucture, the hierarchical micro-nano structure was demonstrated to play a key role in the improvement of the oleophobic/philic variation. Under the test range, the bigger the SiO2 microsphere is, the larger variation is obtained. These findings offer a new method for the design of smart materials with switchable oil wettability.
  • Solvothermal Synthesis and Performances of Magnetite/Reduced Graphene Oxide Composites
    ;;;;Jieshan Qiu
    . 2015, 46(03): 31-0.
    Abstract ( ) Download PDF ( ) Knowledge map Save
    Fe3O4 nanoparticles/reduced graphene oxide (Fe3O4/RGO) composites were prepared via an in-situ solvothermal synthesis method using graphite oxide and ferrocene as precursors. The structure, morphology, magnetic property and electrochemical performance of the obtained Fe3O4/RGO hybrids were investigated by X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy, scanning and transmission electron microscopy (SEM, TEM), vibrating sample magnetometry (VSM) and cyclic voltammetry test. The results show that magnetic nanoparticles with the average size of 20 nm are well dispersed on the surface of reduced graphene oxide sheets, and the loading amount of Fe3O4 nanoparticles in the composites can be easily controlled by changing the ratio of ferrocene to graphite oxide in the reaction mixture. The Fe3O4/RGO composite exhibits superparamagnetic property, as well as good electrochemical stability and rate capability.
Author Center
Review Center
Journal Online
Copyright © Jorunal of Functional Materials
Tel: 023－68264739　 　
E-mail: gnclbjb@126.com　
Total visitors:
Visitors of today:
Now online:
渝公网安备50010902000552号　渝ICP备2022001025号-1