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首页> 外文期刊>Crystal growth & design >Environmentally friendly growth of highly crystalline photocatalytic Na2Ti6O13 whiskers from a NaCl flux
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Environmentally friendly growth of highly crystalline photocatalytic Na2Ti6O13 whiskers from a NaCl flux

机译：NaCl助熔剂对高度结晶的光催化Na2Ti6O13晶须的环保生长

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Idiomorphic and high quality Na2Ti6O13 whiskers were easily grown by the rapid cooling of a NaCl flux. Environmentally friendly whisker growth was conducted by heating a mixture of solute (Na2CO3 + TiO2) and flux (NaCl) at 1100 degrees C and holding at this temperature for 10 h. After that, the mixture was cooled at various rates of 100, 200, >9000 (quenching in air), or > 120000 degrees C h(-1) (quenching into water). The obtained whiskers, which had average sizes of up to 101.5 mu m x 0.7 mu m and aspect ratios of up to 145, were colorless and transparent. The grown whiskers tended to form aggregates, that looked just like a lustered cotton. The whisker forms and sizes obviously depended on the cooling rates of the high-temperature solutions. The aspect ratio of the whiskers increased with the increasing cooling rate and decreasing solute concentration. Transmission electron microscope (TEM) images indicated that the grown whiskers were of a very good crystallinity. The major constituents, that is, sodium, titanium, and oxygen, were homogeneously distributed throughout the whiskers, however, chlorine from the flux and platinum from the crucible were not detected. Furthermore, highly crystalline, ultralong, and flexible Na2Ti6O13 whiskers were successfully grown by the slow cooling of an NaCl flux by the use of the nonstoichiometric mixture of Na2O and TiO2 (2Na(2)O-3TiO(2)). The grown whiskers exhibited good photocatalytic activity under ultraviolet (UV) light irradiation. It is considerably reasonable to suppose that NaCl is adequate to synthesize high quality and well-developed titanate whiskers in an environmentally friendly process of crystal growth.
机译：通过快速冷却NaCl助熔剂，可以容易地生长出同质和高质量的Na2Ti6O13晶须。通过在1100摄氏度下加热溶质（Na2CO3 + TiO2）和助熔剂（NaCl）的混合物，并在此温度下保持10小时，来进行环保的晶须生长。之后，将混合物以100、200，> 9000（在空气中淬火）或> 120000℃h（-1）（淬火到水中）的各种速率冷却。所获得的晶须为无色透明的，其平均尺寸最大为101.5μm×0.7μm，纵横比最大为145。生长的胡须趋于形成聚集体，看起来像有光泽的棉花。晶须的形状和尺寸显然取决于高温溶液的冷却速率。晶须的长径比随冷却速率的增加和溶质浓度的降低而增加。透射电子显微镜（TEM）图像表明生长的晶须具有非常好的结晶度。钠，钛和氧的主要成分均匀分布在整个晶须中，但是未检测到助熔剂中的氯和坩埚中的铂。此外，通过使用Na2O和TiO2（2Na（2）O-3TiO（2））的非化学计量混合物缓慢冷却NaCl助熔剂，成功地生长了高度结晶，超长且柔软的Na2Ti6O13晶须。生长的晶须在紫外线（UV）照射下表现出良好的光催化活性。可以合理地假设NaCl足以在环境友好的晶体生长过程中合成高质量和发达的钛酸酯晶须。

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