响应温度和离子强度的Zwitterion-modified纳米凝:一个散射粒子动力学模拟
Zhaohong Miao1, Lanlan Qin1, Zhaoxi Zhou1
1School of Chemistry and Chemical Engineering, Guangdong Provincial Key Lab for Green Chemical Product Technology, South China University of Technology, Guangzhou 510640, P. R. China.
Langmuir : the ACS journal of surfaces and colloids
|September 15, 2023
概括
研究人员使用模拟来探索纳米凝的特性. 采用Zwitterion修饰的纳米凝显示了温度和盐的反应性,为抗物材料设计提供了洞察力.
科学领域:
- 聚合物科学 聚合物科学
- 材料科学 材料科学 材料科学
- 计算化学计算化学
背景情况:
- 聚-n-异烯胺) (p(NIPAm)) 纳米凝表现出热敏反应的行为.
- 响应刺激的材料对于先进的应用至关重要.
- 了解纳米凝的自我组装和反应是材料设计的关键.
研究的目的:
- 为了研究p(NIPAm) 和zwitterion-modifiedp(NIPAm-co-SBMA) 纳米凝的自我组装和刺激反应性质.
- 探索聚合物度,链条长度,温度和离子强度对纳米凝行为的影响.
- 提供分子层面的洞察力,对抗污染纳米凝的设计.
主要方法:
- 我们使用了散射粒子动力学 (DPD) 模拟.
- 该研究分析了不同聚合物度 (5-10%) 的纳米凝形成.
- 研究了链条长度 (L=10到40) 对纳米凝尺寸的影响.
主要成果:
- 球形纳米凝在5-10%的聚合物度下形成最佳.
- 纳米凝尺寸随着链条长度的增加而增加.
- p(NIPAm) 的纳米凝显示出热敏性 (随温度而膨胀/收缩).
- p ((NIPAm-co-SBMA) 纳米凝同时表现出热反应性和离子强度反应性.
- 在更高的温度 (318 K) 下,超性psbma覆盖了疏水性p (NIPAm) 核心,保持了抗物特性.
- 离子强度会影响纳米凝的体积,由于阻碍了zwitterionic收缩,在盐水系统中体积更大.
结论:
- 修改了Zwitterion的pNIPAm纳米凝表现出双重温度和盐的反应性.
- 模拟结果为这些行为提供了分子层面的理解.
- 这些发现指导了有效的抗化纳米凝材料的设计.
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