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以新疆产天然电气石为原料制备了电气石微粉,利用X射线衍射仪、扫描电镜、高分辨电镜、17O核磁共振研究了电气石微粉的物相结构、微结构特点和电气石的热释电性对水分子团簇结构影响,并对其作用的机理进行了探讨。结果表明,所制备的电气石微粉的结晶性完好,具有单向极性结构的热释电性材料电气石的微晶在温度涨落的环境中可视为电偶极子;电气石粉对水的17O核磁共振谱的半峰宽具有明显的影响,从HW=145.41Hz降到HW=81.11Hz,表明电气石微粉对水分子团簇结构的改善有明显的作用。 相似文献
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提出在碳酸化气氛中间歇加入HCl(间歇氯化)提高电石渣在循环煅烧/碳酸化反应中捕集CO2性能的新思路。在双固定床反应器上,在不同循环次数加入HCl、碳酸化温度、CO2/HCl体积比等条件下,研究HCl间歇加入对电石渣循环碳酸化特性的影响。结果表明,在循环煅烧/碳酸化反应中间歇加入HCl使电石渣间歇氯化能提高其循环捕集CO2性能。在前N次循环碳酸化时加入0.1% HCl,当N=4时能使电石渣获得最优CO2捕集性能,第10个循环时的CO2吸收量比无HCl时提高了51%。HCl与CaCO3发生氯化反应,破坏致密产物层对CO2扩散的阻碍,提高了电石渣的碳酸化转化率。在碳酸化气氛加入HCl时,最佳碳酸化温度仍为700℃。随CO2/HCl体积比增大,HCl对电石渣捕集CO2性能的促进作用减弱。 相似文献
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Two ternary materials systems, which comprise photoinitiator/two-photon initiators, oligomer and binder were prepared. Polymeric waveguide film was manufactured by spinning the materials on optical glass (refraction index=1.5), the two-photon initiated photopolymerization (TPIP) and single-photon holographic photopolymerization were carried out respectively in the polymer wavbguide film. The preparation of these materials was explained and absorption spectra were tested. The experimental results including the micrographs and diffraction patterns verifying the formation of grating waveguide structures were given. The results show that grating waveguide microstructures can be holographically fabricated by single-photon photopolymerization with low-power (tens mW ) continuous-wave (CW) laser at 532 nm successfully. Because the continuous-wave laser at 532 nm is handier than one at 514 nm. 相似文献
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