摘要
利用微尺度受限空间随机行走方法模拟了分子的扩散过程.研究表明,扩散系数越大,粒子越显著地偏离驱动速度的方向;通过选择合适的驱动速度,调控不同组分偏离驱动方向的概率差,从而达到更理想的分离效果.此外,讨论了分子运动的随机分布特征对分析样品带展宽效应的影响.
In order to dynamically track the diffusing molecules in the micro-separation system, and further to understand its influence on separation performance thoroughly, we have developed a software based on the ran-dom walk theory in the confined space, with which the diffusion process in an asymmetric obstacle sieve has been simulated. The results showed that the molecules which own larger diffusion coefficients would be devi-ated from the direction of the driving speed by the asymmetric obstacles more significantly. So as to achieve better separation effect, we should select appropriate drift velocity and regulate the probability difference of the different constituents' deviating from the driving direction. In addition, the band broadening effect and pre-dicted the performance of the separation sieve with different length were discussed. The simulation method pro-posed in this work has been instructive for the development of micro-separation devices and the optimization of operating parameters.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2014年第4期818-824,共7页
Chemical Journal of Chinese Universities
基金
国家自然科学基金(批准号:21121091
51071084
21273113)
国家科技支撑计划项目(批准号:2012BAF03B05)
南京工业大学材料化学工程国家重点实验室开放课题基金(批准号:KL10-11)资助~~
关键词
不对称势垒
扩散
分离
随机行走模拟
Asymmetric obstacle
Diffusion
Separation
Random walk simulation