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      Articles written in Bulletin of Materials Science

    • Effect of the addition of 3-glycidoxypropyltrimethoxysilane to tetraethoxyorthosilicate-based stone protective coating using 𝑛-octylamine as a catalyst

      Dan Li Feigao Xu Li Shao Min Wang

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      A tetraethoxyorthosilicate (TEOS)-based stone protective coating containing functional 3-glycidoxypropyltrimethoxysilane (GPTMS) has been prepared in order to reduce gel crack formation during the drying phase using 𝑛-octylamine as a catalyst. The effect of gel time and viscosity on GPTMS concentration were studied.We have demonstrated that the addition of GPTMS accelerated the gel process and improve viscosity of sol. It was found that GPTMS was chemically incorporated into the gel matrix via Si–O bonds by Fourier transform infrared spectroscopy (FTIR) analysis. Nitrogen adsorption–desorption isotherms of xerogels were measured, they showed that the pore size of xerogels decreased with the addition of GPTMS. Atomic force microscopy (AFM) showed the surface roughness increased as content of GPTMS was higher. The Scotch Tape test and the hardness values showed improvement of cohesion and consolidation ability of hybrid sol. The protective performance evaluation of the treated stones with hybrid sol indicated its acid rain resistance.

    • Influences of nonsolvent on the morphologies and electrochemical properties of carbon nanofibres from electrospun polyacrylonitrile nanofibres

      YULAI ZHAO ZHUANG ZHAO JIAO GAO XIANCAI JIANG LI SHAO HONGMEI LI

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      The influences of nonsolvent on the morphologies and electrochemical properties of carbon nanofibres (CNFs)obtained via pre-oxidation and carbonization of electrospun polyacrylonitrile (PAN) nanofibres were mainly studied.Volatilemethanol (MeOH) and acetonitrile (MeCN) were introduced into PAN solutions as the nonsolvent for PAN, which mayproduce porous structures via inducement of phase separation. The morphologies of the prepared nanofibres were observed viascanning electron microscopy. It was found that PAN nanofibres possessed corrugated and rough surfaces. PAN fibres obtainedin the presence of nonsolvent showed larger diameters and wider distributions than those obtained without nonsolvent. Afterthermal treatments, inter-bonded CNFs were prepared. The structures of CNFs were confirmed by X-ray diffraction andRaman spectrometry. Then the electrochemical properties of CNFs were examined by an electrochemical method in a threeelectrodesystem. Based on chronopotentiometry, CNFs exhibited the highest capacity up to 198 F g$^{−1}$ at current density of3 A g$^{−1}$. The influence rule of nonsolvents on the morphology and capacities of CNFs was summarized and interpreted.

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