29 December 2015, Volume 46 Issue S2
    

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  • Catalytic Mechanism of HgCl2-ZnCl2-ScCl3-CeCl3/C Low-mercury Composite Catalyst in the Synthesis of Vinyl Chloride
    . 2015, 46(S2): 1-0.
    Abstract ( ) Knowledge map Save
    Low-mercury composite catalysts (HgCl2-ZnCl2-ScCl3-CeCl3/C) were prepared by impregnation. ZnCl2, ScCl3 and CeCl3 were used as cocatalysts. Catalytic Mechanism of HgCl2-ZnCl2-ScCl3-CeCl3/C in the Synthesis of Vinyl Chloride (VCM) was studied. Mechanism research shows that the synthesis reaction abides by the principles of stereoselectivity and stereospecificity , followed free radicals and hydrogen transfer mechanism. ScCl3, CeCl3, ZnCl2 and HgCl2 form multi-active centers two-dimension clustered chelate (TDCC), which increase the activated percentage of C2H2 and HCl molecules and enhance the probability of synthesizing VCM.
  • XPS analysis and hydrogenation activity of directly reduced cobalt/aluminum-based catalytic materials prepared via impregnation and precipitation
    Yu XING
    . 2015, 46(S2): 2-0.
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    Literature about the XPS studies of directly reduced Co/Al catalytic materials without calcinations process is sparse. To investigate the surface phases and compositions of cobalt/aluminum-based catalytic materials derived from incipient wetness and coprecipitation routes, XPS tests were conducted to the directly reduced samples with detailed measurements upon Co 2p3/2, Al 2p and O 1s peaks. The XPS data show that CoAl2O4 (i.e., an inactive component) is few on the surface of the incipient wetness sample but is considerable on the surface of the coprecipitated sample. Thus coprecipitation is chosen as the route for the synthesis of cobalt/aluminum-based catalytic materials. FESEM and fixed-bed reactor were employed to investigate the morphology and turnover frequencies of CO hydrogenation reaction, respectively.
  • Mesophase pitch based carbon fiber prepared from direct coal liquefaction residue
    . 2015, 46(S2): 3-0.
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    Large scale application of mesophase pitch based carbon fibers (MPCFs) was limited due to its high cost. Using direct coal liquefaction residue (DCLR) as raw materials for mesophase pitch preparation could reduce the cost of MPCF, and provide a method for high value application of DCLR. Mesophase pitch was prepared from de-ashed DCLR by heat condensation, then the mesophase pitch was spun, oxidation stabilized and carbonized. The feasibility of DCLR as raw material for mesophase pitch preparation was demonstrated. Meanwhile, the influence of mesophase content, softening point and volatile content on spinnability of the mesophase pitch was studied. The results show a good spinnability of mesophase pitch while the mesophase content higher than 70%, and softening point higher than 300 ℃. The diameter of carbon fiber prepared from de-ashed direct coal liquefaction residue is 15 μm, tensile strength is 1500 MPa and tensile modulus is 150GPa.
  • Synergistic effect of chelating agent and oxidant on Cu CMP planarization
    Chen-Qi YAN
    . 2015, 46(S2): 4-0.
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    Synergistic effect of chelating agent and oxidant on copper chemical mechanical polishing(CMP) planarization was investigated. Copper CMP slurry is mainly composed of SiO2 abrasive particles, nonionic surfactant, chelating agent and oxidant. The effect of different synergistic ratios of chelating agent with oxidant on polishing removal rate/static etch rate, electrochemistry, Within-Wafer-nonuniformity(WIWNU) and planarization, surface roughness were detected. Through theoretical analysis of the experimental data, the research shows that when the ratio of the chelating agent and oxidant is about 1:1, the planarization effect is the best. The research provides a certain theoretical basis for further optimization of slurry ingredients to achieve Cu CMP global planarization.
  • Preparation and photocatalytic properties of TiO2/grapheme oxide composite nanotubes
    . 2015, 46(S2): 5-0.
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    A series of TiO2/grapheme oxide (GO) composite nanotubes photocatalysts were prepared by the hydrothermal method and investigated by X-ray diffraction (XRD), transmission electron microscopy (TEM), Raman spectrum and ultraviolet-visible (UV-Vis) diffuse reflectance spectroscopy, respectively. The photocatalytic performances of the samples were evaluated by photocatalytic degrading methylene blue. The XRD and TEM results show that all the samples are compose of the anatase phase nanotubes. The crystal phase of the samples were further confirmed by the results of Raman spectrum measurements. The Raman peaks of GO can be obviously investigated in the Raman spectra of the samples. No visible absorption edge shift can be found in the absorption spectra of the samples after the introduction of GO. But visible light absorption enhancements were observed in the samples of TiO2/GO. The results of photocatalytic activity characterization revealed that better photocatalytic activity was presented in the TiO2 nanotubes than that in the TiO2 nanoparticles. After the introduction of GO, the photocatalytic activities of the composite nanotubes increase and then decrease with the increase of GO amount, gradually. The best photocatalytic property is presented in the sample using 2 ml GO solution. The mechanisms of the photocatalytic property variations in the TiO2/GO composite nanotubes were also discussed in detail.
  • Preparation of PPS filter loaded with MnOx for dust elimination and de-NO by low-temperature SCR
    . 2015, 46(S2): 6-0.
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    PPS fibers were covered with manganese oxides by method of in-situ reaction of impregnated supported manganese nitrate and instilled potassium permanganate to obtain PPS filter loaded with MnOx for dust elimination and de-NO by low-temperature SCR ( Mnx/PPS catalyst ) used for simultaneous catalytic removal of NOx in filter bed dust catcher from flue gases. The activity of the catalyst for SCR of NOx by NH3 was measured. The influences of reaction temperature, MnOx loading were also estimated. The structures and properties of catalysts were characterized by scanning electron microscope(SEM), X-ray diffraction(XRD) and X-ray photoelectron spectroscopy(XPS). Results show that the Mnx/PPS catalyst are quietly active for SCR of NOx by NH3 at temperature range of 160-220℃ with NO conversion achieving 80%-90%, in which dust filters are widely used. It suggests that the coupling of SCR of NOx and dust removal on a catalytic fabric dust filter (Mnx/PPS) is possible.
  • Preparation and properties of germanium/graphite/silicon thin film structure
    MU Xiao-Ye
    . 2015, 46(S2): 7-0.
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    The thin film samples with the structure of germanium/graphite/silicon were prepared on monocrystalline silicon substrates by magnetron sputtering technique. Then the samples were annealed in a rapid thermal annealing (RTA) furnace. The scanning electron microscope (SEM) observation shows that the introduction of graphite transition layer alleviates the lattice mismatch and the thermal mismatch between silicon and germanium.X-ray diffraction (XRD) measurements indicate that 450 oC is the critical substrate crystallization temperature of germanium film, 750 oC is the critical annealing temperature which increases the RTA crystallization degree of Ge film obviously, and 30 seconds is the proximately optimal annealing time.
  • Anti-scaling and corrosion resistance performance of Ni-P electroless coating steel pipes in a simulated geothermal water environment
    Zi-fei Cheng Feng Hou
    . 2015, 46(S2): 8-0.
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    One of the major problems associated with the utilization of geothermal energy is corrosion and scaling. Scanning electron microscopy(SEM), energy dispersion spectrometry(EDS), X-ray diffraction(XRD), immersion corrosion and electrochemistry test were used to study and compare the anti-scaling and corrosion resistance performance of Ni-P electroless coating steel pipes, 304 stainless steel pipes and 20 carbon steel pipes in a simulated geothermal water environment(Heping county, Guangdong province). The results show that the surface energy of Ni-P electroless coating steel pipes is low, and the scales on the surface is not stable which makes it difficult to aggregation. In addition, the passivation film produced on the surface of Ni-P electroless coating steel pipes in the simulated geothermal water is compact and stable, which can protect the pipes from corrosion effectively. Therefore, the anti-scaling and corrosion resistance performance of Ni-P electroless coating steel pipes in the simulated geothermal water is obviously better than that of 304 stainless steel pipes and 20 carbon steel pipes.
  • The influence of Nd-Cu alloy addition on the magnetic properties of die-upset Nd-Fe-B nanocrystalline magnets
    . 2015, 46(S2): 9-0.
    Abstract ( ) Knowledge map Save
    The anisotropic magnets consists of Nd-Fe-B melt-spun powder and low-melting Nd-Cu powder were prepared by hot-pressed and die-upset process method. Compared to the magnet without Nd-Cu alloy, the coercivity of magnet with Nd-Cu addition enhanced from 747 kA/m to 1280 kA/m. The XRD patterns show that the orientation degree decreases with increasing the Nd-Cu addition. The SEM and TEM images show that a thicker grain boundary and smaller grain size are obtained for the magnet after Nd-Cu grain boundary diffusion, and hence the static magnetic coupling effect between the grains is reduced, which increases the coercivity of the magnets.
  • Investigation on preparation and properties of wood-based luminescent materials modified by europium aromatic diacyl complexes
    Qing-Jing XU
    . 2015, 46(S2): 10-0.
    Abstract ( ) Knowledge map Save
    Renewable and cheap wood is an outstanding green engineering material and industrial raw material. But the wood has many shortcomings, such as loose structure, easy flaming, easy aging, and so on. In order to improve the surface properties and extend the useful time, wood surface need to be functionally modified. In this paper, wood surface was decorated by the silane-modified europium aromatic diacyl complexes, which gave wood better fluorescence. The results show that the reaction combined between silane-modified europium complexes and the hydroxyls on the wood surface. With the influences of reaction condition on fluorescence of wood surface analyzed, the fluorescence emission intensity are most when the reaction concentration is 15g/L, the reaction temperature is 50 ℃ and the reaction time is 12 hours. The test of contact angle illustrates that the modification of europium complexes could improve the hydrophobicity of wood. Likewise the results of DSC and TG show the thermal stability of wood was improved with the modification of europium complexes.
  • Study on Packaging Property of PE Film Coated Ce4+/nano-ZnO
    Yun-Tian GUO De-Zhi HUANG Li-Jiang HUO
    . 2015, 46(S2): 11-0.
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    Abstract: This study prepared Ce4+/nano-ZnO powder, dispersed into PVA Sol and to make Ce4+/nano-ZnO PE composite film by coating method. Using TEM characterizes the surface structure and property changes of Ce4+/nano-ZnO. Analyzed the film's mechanic, barrier and antimicrobial properties by using Electronic universal testing machine, Oxygen permeability tester, Water vapor permeability tester and Foil method, and researched its preservation properties for cherry. Results showed that the film can get good mechanical properties when content of the nano-powder is around 1.5%. The barrier properties rise continually when content of nano-powder between 0-2%.The antibacterial rate is over 94% in protected from light, 98% in natural light and 99% in UV when content of the nano-powder is 1%. The preservation effect of film is good when used for cherry packaging.
  • Influence of MoO3 as material of Hole-injection on photo- luminescence performance of the greenish-blue OLED
    Wei-Qian CHEN
    . 2015, 46(S2): 12-0.
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    The five greenish-blue phosphorescent organic light emitting device(OLED) with a series of MoO3 as materials of Hole-injection were fabricated, mCP as host emitting material and BGIr1 as doped material. The influence of MoO3 on the luminous performance of the OLED was investigated. The structure of as-prepared OLED was ITO/MoO3(x nm)/NPB(40 nm)/mCP:BGIr1(30 nm, 18 %)/BCP(10 nm) /Alq3(20 nm)/LiF (1 nm) /Al(100 nm), where 18 % was the doping content of BGIr1 in emitting layer, x was the thickness of MoO3. The experimental results show that the best thickness of MoO3 as the hole-injection layer of the OLED was 20 nm. The optical luminance of 8617 cd/cm2 was obtained for the OLED with 20 nm MoO3 at the voltage of 13 V, and the optical luminous efficiency of 5.7 cd/A was acquired at the current density of 20 mA/cm2. The two main emitting peaks were gained at 488 nm and 512 nm respectively, and the CIE coordinates was (0.19, 0.21).
  • Studied on Properties of Bisphenol A Cyanate Ester Modified by Epoxy Resin
    . 2015, 46(S2): 13-0.
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    Effects of epoxy quantity and molecular structure on properties of modified cyanate ester have been studied by differential scanning calorimetry(DSC), dynamic mechanical analyzer(DMA), thermogravimetic analysis(TGA), dielectric properties testing and mechanical properties testing. The results show that with the adding of epoxy resin the curing reaction mechanism of cyanate ester is changed, glass transition temperature, decomposition temperature and dielectric properties are lowered, as well as the flexural strength and impact strength are increased. The tri-functional group epoxy resin named as TDE-85 with aliphatic cycle and ester bond has better effect on modifying the mechanical properties of cyanate than that of the ortho-cresol formol epoxy resin named as JF-45, and have the similar effect on the heat resistance properties and the dielectric properties of the cyanate ester.
  • Effect of foam agent on properties of polyvinyl alcohol/alkali lignin foam material
    Hua-Chao LUO
    . 2015, 46(S2): 14-0.
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    Prepared polyvinyl alcohol/alkali lignin foam material respectively by composite, organic, inorganic foam agent, determined the optimal dosage of foam agent and the properties of acid and alkali resistant and mechanical. The results show that, the best dosage of organic, inorganic, composite foam agent is respectively 3.0%, 3.0%, 4.0%. The inorganic foam material has highest mechanical properties and water absorption, but its apparent density also high. The degradation of foam material reduced with the increase of pH value. FT-IR shows that organic, inorganic foam material substituted in position 5 and inorganic foam material with highest degree of crosslink. SEM shows that foam materials have obvious pore structure, but the structure is not uniform, mainly due to the volatile bubble structure rupture in curing process. Inorganic foam material has better biocompatibility showed by DSC. TG displays the temperature of three kinds PAFM corresponding to the biggest weight loss rate increased, at the same time degradation residues in turn reduce, thermal stability of inorganic foam material is better and its degradation is better. So the inorganic foam material has the best performance.
  • Preparation and characterization of silver/activated carbon materials for water treatment
    . 2015, 46(S2): 15-0.
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    In order to explore bactericidal-filtrating materials for water treatment, potassium persulfate oxidation method was used to deposit AgO particles onto commercial activated carbon using silver nitrate as precursor. The characterization of the silver/activated carbon samples was carried out by XRD, FTIR, SEM and EDS techniques. The bactericidal activity of the silver/activated carbon samples was tested by shake-flask method. The results showed that it was difficult to deposit AgO particle onto activated carbon by potassium persulfate oxidation, due to the active functional groups existed in activated carbon. Adherent cubic silver deposits were obtained on the silver/activated carbon samples. AgO particles were formed, and then reduced to the metallic form with the presence of activated carbon. The FTIR results confirm the presence of carboxyl, carbonyl, phenolic, quinone, and ether surface groups. The prepared silver/activated carbon samples possessed strong antimicrobial activity. Bactericidal activity tests toward E. coli and S. aureus indicated bactericidal rates up to 99.9%% in just 10 min contact time for the samples with the silver content of 16.03 wt%.
  • Preparation and Properties of composite separators coated by Al2O3/P (MMA-BA) for lithium-ion batteries
    . 2015, 46(S2): 16-0.
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    The composite separators for lithium-ion batteries were prepared by single layer coating Al2O3/P(MMA-BA) nanoparticles with thickness of 2.0~3.0 μm. The properties including puncture strength, air permeability, thermal stability, thermal shrinkage resistance, surface morphology, liquid electrolyte uptake ratio and electrochemical performance were studied. In contrast to a conventional PP separator, the thermal stability and thermal shrinkage resistance of composite separator were improved as a result of large amounts of Al2O3 in coating layer. And the porous structure of coating layer allows for both favorable liquid electrolyte wettability and ionic conductivity, both of which contributes to excellent cycle performance and rate performance of cells assembled with composite separators.
  • Preparation and enhancement mechanism analysis of mullite fibres/ magnesium oxychloride composites
    . 2015, 46(S2): 17-0.
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    Preparation processes of magnesium oxychloride materials were researched in this paper. Three kinds of mullite fibres i.e. 250、150 and 75?m were used to reinforce the strength of the magnesium oxychloride materials, the results show flexural strength of the materials mixed with 20.0wt% 150?m mullite fibres can be reached to 41.8MPa, and more 192.3% than without fibres. The composites are characterized by XRD and SEM, the materials are composed of stick like 5Mg(OH)2?MgCl2?8H2O、3Al2O3?2SiO2、MgO and MgCO3 crystallines and so on. Enhancement mechanism of the materials were analyzed.
  • Self-healing Performance of Concrete in the Sodium Hydroxide Solution Environment
    . 2015, 46(S2): 18-0.
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    Concrete self-healing performance under different alkalinity of sodium hydroxide solution（pH=7，9，11，13）were studied by analyzising mechanical property, crack width, phase composition and microstructure before and after the repairment of concrete crack. The results showed that concrete self-healing performance under sodium hydroxide solution was much better than water. The strength and ultrasonic velocity of concrete increased with the increase of pH of sodium hydroxide solution, and the growth rate was slow first,then quick, finally flattened out. When the alkalinity of sodium hydroxide solution was 13, the concretes showed the best self-healing performance, the maximum strength restoration ratio was 97.6% at the curing age of 60 days and the crack width change rate was 43.9%. The amount and size of hydration products, such as ettringite、gypsum and C-S-H gel, increased with the increase of sodium hydroxide solution alkalinity. Ettringite was wrapped in C-S-H gel, filled the crack and made it healed.
  • Synthesis and property of chitosan oligosaccharide/organic rectorite nanocomposites by microwave radiation
    Si-Qi Huang Zhi-ming YU
    . 2015, 46(S2): 19-0.
    Abstract ( ) Knowledge map Save
    In order to improve efficiency, the microwave irradiation method was used to prepare chitosan oligosaccharide/organic rectorite nanocomposites (CTOOR). Chitosan oligosaccharide was obtained after enzymolysis and rectorite (REC) was modified with Gemini 18-3-18. A study on the morphologies and structures of CTOOR was conducted through field emission scanning electron microscope (FESEM), fourier transform infrared spectroscopy (FT-IR), observation of X-ray diffraction (XRD) and zeta potential analysis and the thermal stability and antibacterial activity of CTOOR and CTO were compared. The results indicated that: CTO was inserted into the silicate layers to form the intercalated nanocomposites, the interlayer distance of OREC was magnified; there were hydrogen bonding and electrostatic interaction between CTO and OREC; both of the thermal stability and antibacterial activity of CTOOR were stronger than that of CTO.
  • Mechanism and properties of hydrogen storage and hydrogen-induced disproportionation of Zr1-xTixCo alloys
    guanghui zhang
    . 2015, 46(S2): 20-0.
    Abstract ( ) Knowledge map Save
    Zr1-xTixCo alloys were prepared via arc-melting method, and then products before and after hydrogenation were characterized by X-ray diffraction. The kinetics of hydrogen absorption and dehydrogenation pressure composition isotherms for all these alloys were obtained via Sievert method, meanwhile, the enthalpy and entropy change for hydrogen desorption were calculated. And hydrogen-induced disproportionation in desorption mode for all these alloys was also investigated. Results demonstrated that the rate and extent of disproportionation of ZrCo alloys decreased with content of Ti substitution,. TG-DSC was carried out to investigate the dehydrogenation process of hydride of Zr1-xTixCo alloys. It could be inferred that Ti element substitution could improve the property of anti-disproportionation of ZrCo alloys via lattice modification.
  • The Influence of A-site Composition Change of LSCF Cathode Materials on the Transmittability of Oxygen Ion and Electrical Performance of SOFC
    Bao-An FAN
    . 2015, 46(S2): 21-0.
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    The cathode materials with two different compositions as La0.6Sr0.4Co0.2Fe0.8O3-δ and La0.54Sr0.44Co0.2Fe0.8O3-δ were prepared by Pechini method and the unit cells with these two different compositions of cathode materials were fabricated. The influence of composition change of A-site of LSCF on its ion conductivity and electrical performance of SOFC was investigated. It has shown that the oxygen ion conductivity can be remarkably enhanced (5 to 6 times) by increasing the concentration of Sr and decreasing the concentration of La in A-site together with slight shortage of stoichiometry in A-site with a result of quite smaller cathode polarization resistance and higher cell electrical performance, whose reason lies in more oxygen vacancy in La0.54Sr0.44Co0.2Fe0.8O3-δ and bigger crystal cell volume which allow the oxygen ion to move more quickly and more freely.
  • The Effect of raw materials on the properties of LiMn0.5Fe0.5PO4 by solid-liquid method
    ya-ping YANG LIAN WANG
    . 2015, 46(S2): 22-0.
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    The samples with olivine structure of lithium manganese iron phosphate (LiMn0.5Fe0.5PO4) were synthesized via solid-liquid method by mixture of NH4H2PO4(99%) and H3PO4(85%). Microstructure and morphology of the samples were respectively investigated by X-ray diffraction(XRD) and scanning electron microscopy(SEM). Electrochemical properties were characterized via galvanostatic charge-discharge as well. The sample synthesized by the mixture of industrial-grade Fe2O3 (95%) and MnO2 (85%) showed spherical shape with about 1-5um average particle sizes . Galvan static charge-discharge test showed an initial discharge capacity of 158.7 mAh/g at 0.1 C. Capacity retention performanced 94% and 96% after 50 cycles during 0.1C and 2C respectively. It suggests the synthesis of LiMn0.5Fe0.5PO4 via solid-liquid phosphorus with indurstrial grade materials (Fe2O3 and MnO2) is a promising industrial method.
  • Effect of normalizing process on microstructure and magnetic properties in strip casting Fe-1.3%Si steel
    Shun-Qing XIE yubo xu
    . 2015, 46(S2): 23-0.
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    The effect of normalizing process on microstructure and magnetic properties of annealed sheets in strip casting Fe-1.3%Si non-oriented silicon steel was investigated. During normalizing at 1000℃~1200℃, the grain of strips coarsen with the increase of temperature and time. The precipitates in normalized strips are mainly AlN and MnS. The size of most of the precipitates exceeds 100nm and the ones with size of 200~400nm account for a large proportion. When normalizing at 1000℃ and 1200℃ for 20min, the microstructure of annealing sheets includes many fine grains with sizes of ≤20μm and is very heterogeneous. The core losses of these sheets are more than 4.5W/kg. However, when normalizing at 1100℃ for 20min, the average grain size of annealing sheets increases to 50~60μm and the homogeneity becomes better, the corresponding core loss decreases to about 4.15W/kg. With the increase of time, the grain size of normalized and annealed sheets increases and the core losses of products reduce gradually. These differences are mainly related to the precipitation behavior during normalizing and annealing.
  • Study on mechanical properties of unsaturated polyester resin composites filled with aluminum hydroxide particles
    . 2015, 46(S2): 26-0.
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    In order to investigate the effects of the particle content and particle size on the mechanical properties of the unsaturated polyester resin flame retardant composites filled with aluminum hydroxide particles, the ATH/UPR composite samples with different particle content and particle size were fabricated by using the mechanical stirrer and ultrasonic irradiation in the current work. All the samples were test on an electronic universal testing machine to determine the tensile property and flexural property. The results show that both of the tensile property and flexural property are influenced by the particle content and particle size. Besides, it is found that the particle size has much more influence on the modulus of the composites.
  • Preparation and electrical conductivity of polyaniline nanotubes synthesized under an applied high magnetic field
    . 2015, 46(S2): 27-0.
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    The ployaniline(PANI) nanotubes were synthesized under a magnetic field of 0.5 T and 8 T and named as PANI-0.5 T and PANI-8 T, respectively. The morphology, crystalline structure and electrical conductivity of the products were characterized by using a scanning electron microscope(SEM), X-ray diffractometer (XRD), and FEI NanoLab 600i SEM/FIB dual beams system, respectively. It has been found that the aspect ratio, crystallinity and electrical conductivity of the polyaniline nanotubes are greatly improved under an applied magnetic field. Moreover, the magnetic-field induced effect is more obvious in the sample of PANI-8 T than that in the sample of PANI-0.5 T. Particularly, the electrical conductivity of PANI-8 T have increased four times of the PANI that was synthesized in absence of a magnetic field.
  • Effects of Nd on Cast Microstructure and Mechanical Properties of ZK20 Magnesium Alloy
    . 2015, 46(S2): 28-0.
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  • Raman spectroscopy of the emulsion 1iquid membrane process of Span80-TBP-NaOH
    Lu XuDong
    . 2015, 46(S2): 29-0.
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    The extraction and concentration of Nickel(Ⅱ) from aqueous solutions by emulsion liquid membranes (ELMs) using NaOH as precipitator in the internal phase has been investigated in this research.The emulsion liquid membrane consists of a surfactant (Span 80)，a mobile carrier (TBP), a film strengthening agent（paraffin），and a diluent (kerosene). Dynamics process of Ni2+ transferring by the ELM was studied using differential method. The membrane reactions were studied by Raman spectrum. The results showed that the time series and the concentration series was equal to be 1.Which shows that the reaction is diffusion-controlled reaction process. Comparing the emulsion spectrogram before the separation with the emulsion spectrogram after the separation, we pointed out the reaction product in the membrane. Contrasted the original oil spectrogram and the spectrogram of the oil after demulsification, which showed that the oil phase can be reused preliminary.
  • Modified carbon nanotubes and its application in the separation membrane
    nana li Zhao Xiuzhen
    . 2015, 46(S2): 30-0.
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    Carbon nanotubes (CNTs) have been widely used in the field of membranes separation because of their excellent mechanical properties and electrical conductivity. However, they are difficult to disperse uniformly in polymer due to the strong inertia. Therefore, it is important to modify CNTs to improve their dispersion. The modification of CNTs and the application in the separation membranes are reviewed in this article.
  • Study on the Synthesis of Zircon Powder
    wang yanhang
    . 2015, 46(S2): 31-0.
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    Zircon is thought to be a great potential material for high temperature structure ceramic, refractory as well as pigment because of its high melting point, low heat conductivity, low coefficient of thermal expansion and excellent chemical stability. Unfortunately, raw zircon powder has lots of impurities, which decrease its service properties. It is significant to fabricate zircon powder by chemical reaction. In this paper, the main fabrication methods, such as solid-state reaction method, hydrothermal method, sol-gel method, precipitation method and latex method, were reviewed. The reaction mechanism of zircon powder was analyzed. In addition, the prospect of zircon powder by chemical reaction was outlined.
  • The Research Advances of polymer inflaming retardant materials modified by graphene
    Xu Yi
    . 2015, 46(S2): 32-0.
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    As is well known, polymer inflaming retardant material is one of the most important branches for the development of functional polymer.In this work, at the basis of analyzing the flame-retardant mechanism of graphene(or its derivatives)/polymer,we have mainly reviewed the covalent and non covalent synthetic methods,besides,in view of the situation of lacking related products at present,we have introduced the performance test methods and progress of functional graphene/polymer composite.
  • Research Progress in Absorbable Mg Alloy Sutures for Medical Application
    Yuan-Yuan WANG
    . 2015, 46(S2): 33-0.
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    There are still many disadvantages in clinical application of absorbable polymer sutures so far，thus it is necessary to develop alternative materials with better comprerhensive properties. Mg alloys have considerable advantages such as high specific strength, good biocompatibility, biodegradability and rich resources. The alloys, showing a great prospect in surgical suture application, are attracting more concerns from medical. This paper summaries the current research of polymer sutures, the advantages and clinical applications of biomedical Mg alloys as well as preparative techniques of its wires. And on this basis, the paper analyzes some potential problems of biomedical Mg alloys for medical application and proposes the development direction in this field.
  • Research development of gradient polymer materials
    zhao yiping
    . 2015, 46(S2): 35-0.
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    Polymer gradient material for its unique structure, special features and potential applications, has been widespread concerned. This paper summarizes the types of gradient polymer materials, such as copolymer, filling compound, blends and interpenetrating polymer network. This study also reviews the method of the difference of monomer reactivity, swelling method, temperature gradient method, dissolution-diffusion method, melt-extrusion method, component dosage control method and light field gradient method, as well as characterization ways of gradient polymer materials. Finally, the future research direction of gradient polymer materials was discussed.
  • Research Progress in The Research of Resin Matrix for Wave-transparent Composites
    Kun Gao
    . 2015, 46(S2): 36-0.
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    The requirement of transparent materials was presented in detail, and the recent progress in the dielectric modification research of resin matrix for transparent composites was reviewed. In the end, the research direction was advanced
  • Advances in Electrorheological Fluids
    Jie Zheng
    . 2015, 46(S2): 37-0.
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    Electrorheological fluids(ERF) are smart materials whose state can be changed reversibly with the aid of an electric field. It has great potential application in mechanical engineering，automatic industry, aerospace and other fields. This article mainly introduced the research progress of ERF, including dispersed grain material, ER mechanism model and the influencing factors. Its practical application in the field of damping vibration were also mentioned in this paper.
  • Research progress in the characteristics of thermal conductivity of graphene and its composites
    . 2015, 46(S2): 38-0.
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    Graphene is a new 2 d carbon material with the characteristics of strong mechanical strength, high thermal conductivity, high light transmittance, high specific surface area and so on. Its good characteristics in high performance electronics, composite materials, gas sensors and energy storage, and other fields make it have a broad application prospect. Its high thermal conductivity has attracted the scholars both at home and abroad. The measuring principle and measuring method of the thermal conductivity of graphene were reviewed in this paper. This paper also expounds the thermal conductivity prediction model and simulation analysis of grapheme. The heat transfer enhancement properties of composite materials of grapheme were introduced in this paper. Finally, the thermal conductivity research direction of graphene in the future was prospected.
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