Gui X.,Anhui University |
Gui X.,Anhui Water Conservancy Technical College |
Xi A.,Anhui University |
Shen Y.,Anhui University |
And 2 more authors.
International Journal of Materials Research | Year: 2011
A series of MSU-x wormlike mesoporous silica samples were synthesized using a new type of gemini surfactants [C nH 2n+1N+(CH 3) 2-CO 2-(CH 2) 2-CO 2-N+(CH 3) 2C nH 2N+1]. 2Br (n = 12, 14, 16) at circumneutral pH and characterized using Fourier transform infrared spectroscopy, thermo gravimetric analysis, X-ray diffraction, N1 adsorption-dc- sorption and scanning electron microscopy. The MSU-x samples have high surface area and thick pore walls. The pore structure remained after treatment in boiling water for 72 h, which has hardly been reported among mesoporous materials synthesized under mild conditions. The effects of synthesis temperature, aging time and concentration of surfactant on the mesoporous structure were investigated. Based on these, a formation mechanism of mesoporous silica using the new gemini surfactant was proposed. © Carl Hanser Verlag GrnhH & Co. KG.
Han B.,Anhui University |
Xie A.,Anhui University |
Yu Q.,Anhui University |
Huang F.,Anhui University |
And 3 more authors.
Applied Surface Science | Year: 2012
Pb 2+ ions pose a significant threat to the environment and public health. Removal and reuse of Pb 2+ ions from the environment are major focuses of waste treatment. Here the poly(acrylonitrile-acrylamide- acrylic acid) hydrogel prepared via crosslinking polymerization was introduced to capture Pb 2+ ions, then as an in situ template to induce the formation of PbSO 4 crystals with special morphology successfully. The absorption efficiency of Pb 2+ ions by hydrogel was tested. The results show at the conditions of initial pH 5, 25 °C, 1.578 mg Pb 2+ ions was removed by per unit hydrogel mass. PbSO 4 crystals were characterized by X-ray diffraction, Raman spectrum, scanning electron microscopy, transmission electron microscopy, and fluorescence spectrometer. The results indicate that the branch-type structure crystals were excellent crystalline and mainly oriented along (1 0 1) and (2 3 1) plane. The PL spectrum show emission peaks at 380 and 400 nm and indicate that the product may have applications in an electronic light device. This approach provides an inspiration on the post-processing of the secondary pollution. © 2012 Elsevier B.V. All rights reserved.
Tie D.,Anhui University |
Xia R.,Anhui University |
Xia R.,Key Laboratory of Environment friendly Polymer Materials of Anhui Province |
Hao J.,Anhui University |
And 6 more authors.
Gongneng Cailiao/Journal of Functional Materials | Year: 2015
In this paper, the modified UF resin/paraffin micro-capsules were prepared by microencapsulation technology with melamine modified urea-formaldehyde resin as capsule wall and anionic and non-ionic paraffin emulsion as capsule core. The results showed that when the material of capsule core is anionic paraffin emulsion prepared by Stearic acid and ammonium hydroxide, the mass ratio of the capsule core and wall is 1.6, we can prepare the micro-capsules whose coating rate is 52.41%, average particle size is 20 μm, wall thickness is 500 nm. The micro-capsule's enthalpy is 166 J/g, has great effect of phase change energy storage. ©, 2015, Journal of Functional Materials. All right reserved.