Jorunal of Functional Materials

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The research on properties of ZnO nanowires modified by Ag nanoparticles

He－Qiu Zhang ;

. 2015, 46(06): 1-0.

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Hydrothermal solution method and thermal vacuum evaporation method are used to grow ZnO nanowires with different mass of Ag modification. The surface morphology, crystal structure and optical property of the samples are characterized by field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD) and spectrometer absorption. Also the property of field emission is tested. The results indicate that with the mass of Ag increasing, the surface morphology of the samples change from Ag nanodots on ZnO nanowires to ZnO nanowires nearly all covered by Ag nanoparticles. The absorption spectrum indicate that the ability of light absorption will enhance after modified by Ag. However, there will be a critical value. If the mass of Ag beyond the critical value, the absorption ability will be descend. At last, field emission properties also be researched, the result reveal that the modification of Ag will decrease the threshold voltage.

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Synthesis, modification and electrochemical performance of NH4V4O10 nanobelts

Wang Nian

. 2015, 46(06): 2-0.

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Single-crystalline and pure NH4V4O10 nanobelts were successfully synthesized by a simple hydrothermal method. Based on these techniques, one-dimensional NH4V4O10 nanobelts also were synthesized by adding about 3% mol graphene oxide. The resulting products were tetragonal zircon-type structure and characterized using XRD, SEM, TEM, HRTEM and Cyclic Voltammetry. Because of being reduced of graphene oxide during the hydrothermal reaction, the conductive capability of the NH4V4O10 nanobelts doping the graphene oxide was improved obviously than the pure NH4V4O10 nanobelts. It was concluded that the electrochemical performance of NH4V4O10 nanobelts can be improved by doping the graphene oxide.

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Effects of cerium oxide on the properties of neoprene

;;;Jun DU;;

. 2015, 46(06): 3-0.

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Surface modification process of cerium oxide (CeO2) by stearic acid was investigated, CeO2 and modified CeO2 reinforced neoprene (CR) was prepared by means of mixing. The structure of modified CeO2 was characterized by SEM, FT-IR and XRD, vulcanization properties, mechanical properties, aging resistance and thermal stability of CeO2/ CR and modified CeO2/ CR composite materials were evaluated. Results showed that crystal structure of modified CeO2 was not changed by modification process and stearate salt was generated on the surface. Compared with added unmodified CeO2, vulcanization time of CR was shortened by 9.7%, the mechanical properties, aging resistance and thermal stability of CR enhanced in varying degrees by adding modified CeO2.

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Preparation and characterization of carbon membrane without-support from phenolic resin via soft template method

;;;;Shou-Xin Liu

. 2015, 46(06): 4-0.

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Carbon membrane without-supported was synthesized from phenolic resin using amphiphilic block copolymer F127 as soft template in alkali-acid system. Scanning electron microscopy, transmission electron microscopy, nitrogen adsorption-desorption (77 K) and CO2 /N2 separation was used to observe the surface morphology and test the performance. Results showed that the surface morphology and pore structure of the samples can be controlled by varying F127 dosages and carbonization temperature. With the increasing of mass ratio of phenol to F127,Surface area, pore volume and average pore diameter increased firstly, and then decreased, Surface area of 467 m2∕g and mesopores rate of 31.3% can be achieved when the mass ratio is 1.06. With the carbonization temperature increasing from 600 ℃ to 800 ℃, disordered worm-like pore structure was converted into extensive two-dimensional(2D) hexagonal pore structure. Thickness of the prepared carbon membrane was about 300 μm, which exhibited excellent separation performance for CO2 and N2, and the selectivity for CO2 and N2 of 2.53 could be achieved.

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Study on the effect of TiO2 nanoparticles on the microstructure and properties of Ni-PTFE coating

. 2015, 46(06): 5-0.

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Combining the nano sol technology with the composite electroplating technology, the author added the nano-TiO2 sol into the Ni-PTFE solution and prepared the nano particles enhanced composite coating Ni-PTFE-TiO2. Keeping its self-lubrication，new coatings got better hardness and wear resistance. The analysis of microhardness, tribological properties and microstructure indicated that adding appropriate amount nano-TiO2 sol can refine the microstructure and improve the compactness of Ni-PTFE coating. At the same time, the hardness and wear resistance would effectively improved. The experimental results also have manifested that adding TiO2 sol 30ml/L into solution with PTFE 30g/L can enhance the hardness of Ni-PTFE composite coating from HV360 to HV480.

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Effect of Plasticizer Types on the Properties of Starch/Polylactic Acid Composites

ZUO Yingfeng;

. 2015, 46(06): 6-0.

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Starch/polylactic acid (PLA) composites were plasticized with ethylene glycol, glycerol, polyethylene glycol 400 and formamide as plasticizer, respectively. The effect of plasticizer types on the properties of starch/PLA composites was studied. The compatibility of the composites was characterized by XRD, SEM, TGA and rotary rheometer. The melt index, mechanical properties and water absorption rate of composites were also tested. The results show that, the compatibility improve effectiveness of starch/PLA composites with different plasticizers was follow the glycerol > formamide > ethylene glycol > polyethylene glycol 400. The mechanical properties and water absorption rate of starch/PLA composites were affected by the compatibility. The better compatibility, the greater mechanical strength and elongation at break, but the lower water absorption rate. The melt fluidity of alcohols plasticizer plasticized composites was gradually decreased along with the increasing of molecular chain, but melt fluidity of formamide plasticized composites was too large.

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Preparation and Characterization of Magnetic IRMOF-3 with Core-shell Structure and Its Catalytic Performance in Knoevenagel Condensations

;Yanmei Zhang ;chu gang ;;

. 2015, 46(06): 7-0.

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Core-Shell magnetic IRMOF-3 was prepared by step-by-step method using Fe3O4 as the core and IRMOF-3 as the shell. The hybrid materials was characterized by XRD, FT-IR, TEM, and SEM, which were further investigated in the Knoevenagel condensation of benzaldehyde and ethylcynoacetate. Results indicated that the hybrid magnetic MOFs exhibit core-shell structure and exhibited good activity and stability in the Knoevenagel condensations.

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Luminescence of Dy3+/Tb3+ Doped Scintillating Glasses with High (Gd(1-x)Lux)2O3 Concentration

;Qian WANG; Hai-Ping Xia

. 2015, 46(06): 8-0.

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The Dy3+/Tb3+ doped oxyfluoride glasses with high Gd((1-x)Lux)2O3 concentration were prepared by high temperature melting method. The absorption spectra, excitation spectra, emission spectra under UV excitations and decay curves of Dy3+ ions were measured and analyzed. There are some impact for the luminescence of Tb3+ ions that Dy3+ ions concentration increased, and the energy transfer mechanisms of the Dy3+/Tb3+ doped scintillating glasses are analyzed by the I-H theory model. The result show that the Dy3+ ions can sensitize the luminescence of Tb3+ ions. The Dy3+ ions have positive impact for luminescence of Tb3+ ions, however when the concentration of Dy3+ ions more than 2 mol%, the intensity of emission of Tb3+ ions decrease with the concentration of Dy3+ ions increased. The energy transfer efficiency of between of Dy3+ and Tb3+ ions were calculated. The results indicate that the energy transfer mechanism is non-radiative energy transfer, and energy transfer efficiency increases with the concentration of Tb3+ ions.

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The model of thickness prediction for wild aluminum medium plate based on artificial neural network

; ;;

. 2015, 46(06): 9-0.

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The accuracy of the thickness prediction model is an important factor which was influenced the thickness control. Aiming at the “1+4” hot tandem rolling line which was domestic leading and most wide, According to the processed measured data of as-rolled 5083 wild aluminum medium plates, a thickness prediction model was developed by artificial neural network based on the analysis of key factors. The relative error of the model is within 0.5%，which is better than that of previous models. And the high-precision prediction for rolling thickness was achieved. The developed model was successfully to predict the thickness of 5052 wild aluminum medium plate and exhibited good generation ability.

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Synthesis, application of a halogen-free flame retardant with phosphaphenanthrene group

;Yu -Ying ZHENG

. 2015, 46(06): 10-0.

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2-(6-oxido-6Hdiben-(c,e)(1,2)-oxaphosphorin-6-yl)-1,4-bis(5',5'-dimethyl-1,4-dioxaphosphorinanyl-2-oxy) benzene (DPPOBQ), a novel halogen-free flame retardant with phosphaphenanthrene group, was synthesized via phospous oxychloride, neopentyl glycol, 9,10-dihydro-9- oxa-10-phosphaphenanthrene-10-oxide (DOPO) and 1,4-benzoquinone by a three step reaction. And the structure of DPPOBQ was characterized and studied by mass spectrometry (MS), elementary analysis, fourier transform infrared spectra (FT-IR), 1H and 31P nuclear magnetic resonance spectrum (1H-NMR, 31P-NMR ), respectively. Then the flame retardance in EVA foam composites was discussed. The results of TG-Mass show that the flame retardant has a high thermal stability and excellent char-forming ability. The 5% weight loss temperature of title compound was above 260.2℃ and the char yield was about 19.1% at 1000℃.

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Photocatalytic Property on TiO2@ Amino-functional carbon quantum dots

. 2015, 46(06): 11-0.

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Carbon quantum dots (CQDs) and their surface amine modification were prepared in a autoclave, and TiO2 was produced in the hydrothermal conditions, then CQDs was incorporated intoTiO2.Fluorescence intensity of amino-functional CQDs was higher than original CQDs, while the fluorescence of composite catalysts was quenched under the same conditions, and absorption capacity was strengthened in visible solar wavelength range. Photocatalytic property of single CQDs and TiO2 were both weak, composite catalysts can accelerate the degradation of methylene blue (MB). Ammonia-capped CQDs and TiO2 composite catalyst can degrade MB completely in 15 minutes , and ethylenediamine-capped CQDs and TiO2 composite catalyst only need 10 minutes. This showed that the availability of visible light increased.

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Progress of nano-ZnO/polymer composites synthesized by emulsion polymerization

. 2015, 46(06): 12-0.

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Nano-ZnO/polymer composites have been widely used in electronics, environmental protection, chemicals, bio-engineering and other fields owing to the combination of excellent chemical and physical properties of nanoparticles and easily-processing and high strength of polymer. Emulsion polymerization, without high cost and processed under mild conditions, is frequently used to fabricate nano-ZnO/polymer composites. This review provided a comprehensive overview of the research status of nano-ZnO/polymer composites via emulsion polymerization. Several modified emulsion polymerization methods used to prepare nano-ZnO/polymer composites were mainly summarized and commented, while the formation mechanism of nano-ZnO/polymer composites were described. Then the application of nano-ZnO/polymer composites in optoelectronics, antibacterial, paint and other fields were reviewed. At last, the future research directions of nano-ZnO/polymer composites prepared by emulsion polymerization were also prospected.

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Synthesis of micro/nano ZnO with pomponlike shapes and its photocatalytic activity in organic dyes degradation

La-Ga TONG ;;

. 2015, 46(06): 13-0.

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Micro/nano ZnO with pomponlike shapes has been successfully synthesized by using Zn(Ac)2?2H2O and NaOH (1:6, n/n) as the raw materials and the glutamate fluoboric acid ionic liquid aqueous solution as the reaction medium at the room temperature (25℃, 20 min) and then under microwave heating(80℃,10 min). The synthesized samples were characterized by scanning electron microscopy combined with energy disperse X-ray analysis (SEM-EDS), X-ray powder diffraction (XRD) and the Brunauer-Emmett-Teller (BET) analysis. The product has hexagonal (wurtzite) structure, the diameter of the pomponlike ZnO was approximately 1.6~3.0 μm, the particle size of the powder was about 20.4 nm, and the specific surface area of the pomponlike ZnO was 28.3 m2?g-1, the yield of the product with high purity was about 95.6%. The nano materials obtained have high photocatalytic activity and stability under the sunlight. Using 30 mg nano-ZnO as the catalysts for photocatalytic degradation of 100 mL of 10 mg?L-1 methyl orange (MO) and bromocresol green (BG) aqueous solution under the sunlight for 5h, the decolorization ratios are 74.3% and 86.4%, respectively. The morphology and weight change of the materials has not been detected yet after reused 5 runs.

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Synthesis and optical properties of two-photon fluorescent fluorene derivatives

; ;;;;;

. 2015, 46(06): 14-0.

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Abstract: In this paper, five new fluorene derivatives were synthesized by Heck reaction (M1~M5), and 2-bromide fluorene with different alkyl side chain and substituted styrene with different end groups were served as raw materials. The molecular structures were characterized by IR, 1H NMR and elemental analysis, and their UV absorption spectra, single photon fluorescence spectra and two-photon fluorescence spectra are tested and analyzed. The results show that the red-shift extent of UV and fluorescence spectra (M1~M5) is increased with the electron-donating ability of end group, and the two-photon absorption cross section is also increased with it. By changing flexible chain length of the fluorene ring can adjust the solubility of the compound, but it’s not affected on the absorption spectra and luminescence performance.

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Recent progress on preparation of energy storage phase change materials

Yan-Shan LI; ;;;

. 2015, 46(06): 15-0.

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Latent heat energy storage is an effective way in the application of clean energy such as solar energy and terrestrial heat. Energy storage phase change materials (PCMs) possess high latent heat storage density and can keep constant temperature approximately, they show potential application prospect in utilizing of clean energy. This paper provides a review on the preparation of PCMs for energy storage, including mechanical process, physical-chemical process and chemical process. And the specialties of all the ways are introduced as well.

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One-step pyrolytic synthesis of magnetic mesoporous structured Fe-Co oxides

Ding AI;

. 2015, 46(06): 16-0.

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Mes-structured Fe-Co oxides with different Fe/Co molar ratios have been successfully fabricated through one-step pyrolytic method using homogeneous complex oxalates as precursors. The prepared samples were characterized by X-ray diffraction (XRD)、 transmission electron microscopy (TEM)、N2 adsorption/ desorption and vibrating sample magnetometer techniques. It is shown that the prepared samples possessed homogeneous mesopores and good magnetic properties. With the increase of Fe-Co molar ratios, the specific areas、the pore size at the maximum probability and the specific saturation magnetization (Ms) increased. In addition, the specific saturation magnetization (Ms) still increased but the specific areas decreased with calcining temperature increasing.

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Preparation，characterization of CsxH6-xP2W18O62?nH2O and its activity on catalytic synthesis of adipic acid

Xiao-Hua CAO

. 2015, 46(06): 17-0.

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Cesium salts of Dawson-type tunstophosphoric acids were prepared by the precipitation method, and characterized by FT-IR, SEM, XRD and EDS. The catalysts were used in the synthesis of adipic acid. The results showed that under the best reaction conditions, i.e., the number of cesium in cesium salt replaced was 3, the mass ratio of the catalyst to cyclohexanone was 7.6%, molar ratio of cyclohexanone to 30 percent hydrogen peroxide of 100:375, reaction time of 4.0 h, microwave power of 300 W, reaction temperature of 100℃, the yield of adipic acid could reach 90.4%. The filtration containing the catalyst could be concentrated by the rotary evaporation and be reused five times by easily separation of the product after reaction, the isolated yield of adipic acid was still above 73.1%.

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Preparation and properties of electrolytic manganese slag composite Fe-Mn-Cu-Co based infrared radiation material

Wu-Bin Gao

. 2015, 46(06): 18-0.

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Using Fe2O3、MnO2、CuO、Co2O3 powders as base materials, and electrolytic manganese slag as composite raw material. A novel infrared radiation material was developed by solid-state reaction method. The phase structure and micro-morphology of the obtained composite infrared radiation material were characterized by XRD and SEM, respectively. The effect of electrolytic manganese slag adding proportion, sintering temperature and holding time on the infrared radiation property of obtained composite materials were discussed. The results showed that as 10% adding proportion of electrolytic manganese slag sintered at 1150, 1210, 1270℃ for 2h, the emissivities of the obtained composite materials were 0.874, 0.904, 0.911, respectively. The emissivity was 0.924 with the optimum condition for the preparation was sintered at 1270 for 3h. With the increase of the added proportion of manganese slag, the emissivities of samples were declined; however, the emissivity was still 0.89 as the 30% added proportion of manganese slag. The key factors in obtaining high emissivity composite materials were generated and well crystal morphology of CoMn2O4、MnFe2O4 spinel structure and Mn(CuMn)O4 inverse spinel structure.

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Synthesis of Nano AlN Particles by Wet Chemical Method

Yong-Zhen HU;

. 2015, 46(06): 19-0.

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In this paper, nano AlN particles were prepared by combining alkoxide hydrolysis with carbothermal reduction and nitridation method. Using aluminum isopropoxide, fructose and ethanol as starting materials, a transparent gel was prepared. Then a molecular level mixing precursor was obtained under drying. Single-phase AlN particles were synthesized through carbothermal reduction and nitridation at 1450°C. The forming mechanism of the precursor was studied, as well as the effect of gelation temperature, C/Al ratio, calcination temperature and time on the synthesis of AlN. XRD、TG-DSC and SEM were utilized to characterize the synthesized powder. Through optimizing process, equiaxed AlN particles were obtained with a diameter ranging from 30 to 90nm.

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31 March 2015, Volume 46 Issue 06