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| 1 | In situ NMR diffusion coefficients assessment of lithium ion conductor using electrochemical priors and Arrhenius constraint——A computational study显示文摘In situ NMR measurements of the diffusion coefficients,including an estimate of signal strength,of lithium ion conductor using diffusion-weighting pulse sequence are performed in this study.A cascade bilinear model is proposed to estimate the diffusion sensitivity factors of pulsed-field gradient using prior information of the electrochemical performance and Arrhenius constraint.The model postulates that the active lithium nuclei participating electrochemical reaction are relevant to the NMR signal intensity,when discharge rate or temperature condition is varying.The electrochemical data and the NMR signal strength show a highly fit with the proposed model according our simulation and experiments.Furthermore,the diffusion time is constrained by temperature based on Arrhenius equation of reaction rates dependence.An experimental calculation of Li_4Ti_5O_(12)(LTO)/carbon nanotubes(CNTs) with the electrolyte evaluating at 20 ℃ is presented,which the b factor is estimated by the discharge rate. | Liang Deng Wen-Hui Yang Xing Lyu Shu-Feng Wei Zheng Wang Hui-Xian Wang | 2017 | Chinese Chemical Letters2017，28，2： | 1 |
| 2 | 聚丙烯中丙烯酸酯的液-固扩散行为显示文摘小分子单体丙烯酸甲酯(MA)、丙烯酸乙酯(EA)、丙烯酸丁酯(BA)通过液-固扩散从聚丙烯(PP)粒子表面扩散至内部,研究了溶胀温度、溶胀时间、单体浓度和超声波作用对上述单体扩散速率的影响。结果表明,PP粒子表面存在的微孔,内部大量疏松结构和非晶区,为丙烯酸酯的扩散-吸附提供了通道和场所;相同条件下EA的扩散速率最快,增加单体浓度和超声波作用均有利于提高单体的扩散速率。 | 龚延蒙 李晓望 韩金直 黄俊 魏宏鑫 祝宝东 刘金月 | 2017 | 化学工程师2017，31，11： | 1 |
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