十二烷基硫酸钠
聚丙烯酰胺
化学
分子动力学
化学工程
理论(学习稳定性)
钠
动力学(音乐)
色谱法
高分子化学
计算机科学
工程类
有机化学
物理
计算化学
机器学习
声学
作者
Gang Wu,Qianqian Zhu,Congtai Yuan,Hongbing Wang,Chunling Li,Shuangqing Sun,Songqing Hu
标识
DOI:10.1016/j.ces.2017.03.011
摘要
Abstract Molecular dynamics simulations were performed to investigate the effect of the concentration of polyacrylamide (PAM) and the hydrolysis degree of partially hydrolyzed polyacrylamide (HPAM) on the stability of sodium dodecyl sulfate (SDS) foams. The effect of polymer on the complex systems (PAM-SDS and HPAM-SDS) was investigated by analyzing the density distribution of SDS headgroups, the radial distribution function (RDF) of hydration of SDS headgroups, the mean square displacement (MSD) of hydrated water around the amide group. The results show that an increase of PAM concentration can enhance the interaction between PAM and SDS, increase the number of hydrated water molecules around SDS headgroups and weaken the mobility of the hydrated water molecules around PAM, which will be beneficial to improve the foam stability. It has been observed that the favorable structure of SDS monolayer for stable foam appears when the hydrolysis degree of HPAM is 20% in the four foam systems of our simulations. In all four foams, the numbers of water molecules around headgroups increase first with the increase of HPAM hydrolysis degree, reaching a maximum value at HPAM 20%, followed by a decrease with larger hydrolysis degrees. These observations indicate that the foam is the most stable when the hydrolysis degree of HPAM is within the range of 20–30%.
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