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Charge-balanced codoping enables exceeding doping limit and ultralow thermal conductivity

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中国科学技术大学学报 2024年第6期54卷 1-7,I0009页

作者： Long Chen Chun Wang Lin Wang Minghao Wang Yongchun Zhu Changzheng Wu School of Chemistry and Materials science University of Science and Technology of ChinaHefei 230026China Hefei National Research Center for Physical sciences at the Microscale University of Science and Technology of ChinaHefei 230026China Institute of Energy Hefei Comprehensive National Science CenterHefei 230031China

Materials with low thermal conductivity are applied extensively in energy management,and breaking the amorphous limits of thermal conductivity to solids has attracted widespread attention from *** is a common strategy for achieving low thermal conductivity that can offer abundant scattering centers in which heavier dopants always result in lower phonon group velocities and lower thermal ***,the amount of equivalent heavyatom single dopant available is ***,nonequivalent heavy dopants have finite solubility because of charge ***,we propose a charge balance strategy for SnS by substituting Sn2+with Ag^(+)and heavy Bi^(3+),improving the doping limit of Ag from 2%to 3%.Ag and Bi codoping increases the point defect concentration and introduces abundant boundaries simultaneously,scattering the phonons at both the atomic scale and *** thermal conductivity of Ag0.03Bi0.03Sn0.94S decreased to 0.535 W·m^(−1)·K^(−1)at room temperature and 0.388 W·m^(−1)·K^(−1)at 275°C,which is below the amorphous limit of 0.450 W·m^(−1)·K^(−1)for *** strategy offers a simple way to enhance the doping limit and achieve ultralow thermal conductivity in solids below the amorphous limit without precise structural modification.

关键词： charge-balanced codoping heavy atom point defect grain boundary ultralow thermal conductivity

Dynamic Analysis on Organic Matter and Nitrogen Pollution of Dongchang Lake

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Agricultural science & Technology 2014年第8期15卷 1390-1394,1402页

作者：翟胜王东丽肖栋梁韩婷江振齐永强周建伟王巨媛聊城大学环境与规划学院山东聊城252059 聊城市环境科学工程设计院环境检测中心山东聊城252000 山东国环产业投资有限公司山东聊城252000 聊城大学农学院山东聊城252059

The aim was to explore dynamic changes of organic matter and nitrogen pol ution in Dongchang Lake. [Method] Monitoring data, including BOD5, CODCr, NH3-N and TN, of Dongchang Lake were chosen for analysis during 2002-2011. [Result] Water quality of the six lake districts showed deteriorating in monitor-ing period, and TN was the dominant pol ution factor; BOD5/CODCr ratio was low, suggesting biodegradability of organic pol utant in the lake was lower. NH3/TN ratio was higher, indicating NH3-N was a major factor causing nitrogen exceeding in 2010. In addition, correlations between BOD5 and CODCr and between NH3-N and TN in the lake districts maintained at a significant level. [Conclusion] The research provides references for improving water in Dongchang Lake.

关键词： Dongchang Lake Organic pol utant Nitrogen pol ution Dynamic trend Correlation analysis

邻接交联丁腈羟/聚醚基聚氨酯脲弹性体的制备与性能(英文)

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合成橡胶工业 2009年第1期32卷 76-76页

作者：孙健王胜军郝俊松李再峰青岛科技大学生态化工教育部重点实验室山东青岛266042

以丁腈羟和聚醚二醇、甲苯二异氰酸酯及扩链剂为原料,加入自由基引发剂双二五和化学交联剂N,N′-马来酰亚胺间苯撑(HAV-2),制备了邻接交联型聚氨酯脲弹性体(PUU)。研究结果表明,随着HAV-2用量的增加,交联PUU弹性体的高温力学性能保持率... 详细信息

以丁腈羟和聚醚二醇、甲苯二异氰酸酯及扩链剂为原料,加入自由基引发剂双二五和化学交联剂N,N′-马来酰亚胺间苯撑(HAV-2),制备了邻接交联型聚氨酯脲弹性体(PUU)。研究结果表明,随着HAV-2用量的增加,交联PUU弹性体的高温力学性能保持率逐渐提高,弹性体由热塑性转变为热固性,不再有软化点出现,表现出较好的热性能。

关键词：丁腈羟邻接交联聚氨酯脲热性能