• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Crystal Growth >Growth kinetics evaluation of hydrothermally synthesized β-FeOOH nanorods
【24h】

Growth kinetics evaluation of hydrothermally synthesized β-FeOOH nanorods

机译：水热合成β-FeOOH纳米棒的生长动力学评价

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Based on the proposition that a quantitative and qualitative relationship between alcohol surface tension and particle growth exists, the effect of four different organic solvents on the growth kinetics of β-FeOOH (akaganeite) nanorods have been evaluated in this study. Two-stage growth of akaganeite nanorods have been observed in the presence of butanol and propanol as solvents. The first growth stage follows a typical power law representing Ostwald Ripening (OR) kinetic. The second stage of growth was found to be asymptotic and was fitted by the Oriented Attachment (OA) kinetics. HRTEM images of the synthesized nanoparticles also showed crystallographically specific oriented attachment based growth of the nanocrystals. Signs of OA mechanism was not observed from the TEM images of the particles synthesized using ethanol and methanol as solvents. The rate constants for each kinetic was evaluated and the rate constant for OR kinetics, K_(OR), was found to be significantly higher than the rate constant for OA kinetics, K_(OA), under the reported conditions for the four different solvents used. The rate constants were related to the surface tension of alcohol. A factorial trial was used to evaluate the significance of interaction effects of process parameters. By correlating the surface tension of solvents with different process parameters a generalized correlation has been developed to predict β-FeOOH aspect ratios for the first time. This correlation was validated by an independent study. This correlation takes three different process parameters into consideration in conjunction with the solvent surface tension to predict particle aspect ratios with acceptable confidence.
机译：基于酒精表面张力与颗粒生长之间存在定量和定性关系的假设，本研究评估了四种不同有机溶剂对β-FeOOH（赤铁矿）纳米棒生长动力学的影响。在丁醇和丙醇作为溶剂的存在下，已观察到赤霞石纳米棒的两阶段生长。第一生长阶段遵循代表奥斯特瓦尔德熟化（OR）动力学的典型幂律。发现生长的第二阶段是渐近的，并通过定向附着（OA）动力学进行拟合。合成的纳米粒子的HRTEM图像还显示了基于晶体学的特定定向附着的纳米晶体的生长。从以乙醇和甲醇为溶剂合成的颗粒的TEM图像中未观察到OA机制的迹象。在报告的使用四种不同溶剂的条件下，评估了每种动力学的速率常数，发现OR动力学的速率常数K_（OR）明显高于OA动力学的速率常数K_（OA）。 。速率常数与酒精的表面张力有关。析因试验用于评估过程参数相互作用影响的重要性。通过将溶剂的表面张力与不同的工艺参数相关联，已开发出一种通用的相关性来首次预测β-FeOOH长宽比。一项独立研究证实了这种相关性。这种关联将三个不同的工艺参数与溶剂表面张力一起考虑在内，以可以接受的置信度预测颗粒的长宽比。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号