Solvent diffusion in polymer-embedded hollow nanoparticles studied by in situ small angle X-ray scattering
Solvent diffusion in polymer-embedded hollow nanoparticles studied by in situ small angle X-ray scattering
复制标题
原位小角 X 射线散射研究聚合物嵌入中空纳米粒子中的溶剂扩散
DOI：
10.1039/c7cp03741d
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发表时间：
2017
影响因子：
3.3
通讯作者：
Goran Ungar
中科院分区：
文献类型：
--
作者：
Zhihong Chen;Sun Hye Hwang;Xiangbing Zeng;Jongmin Roh;Jyongsik Jang;Goran Ungar
介绍了一种利用原位时间分辨小角X射线散射技术监测聚合物凝胶支撑的陶瓷空心纳米颗粒中溶剂扩散的方法。形状因子的变化与离散散射模型相匹配。连续反应动力学模型用于分析溶剂扩散的不同阶段。速率常数和扩散系数提取。通过将低分子聚乙二醇在聚环氧乙烷包埋的HNP中的扩散作为模型情况，发现溶剂扩散通过6 nm厚的HNP壳需要约0.7 s，填充内腔需要另外1.2 s，而扩散系数约为1018 m2 s-1。结果表明，该方法可以同时测量溶剂渗透到聚合物凝胶和嵌入的亚100 nm HNP。
In situ time-resolved small-angle X-ray scattering is introduced as a method to monitor the diffusion of a solvent in ceramic hollow nanoparticles (HNPs) supported by a polymer gel scaffold. Changes in the form factor were matched to discrete scattering models. A consecutive reaction kinetic model is used to analyze different stages of solvent diffusion. Rate constants and diffusion coefficients are extracted. By taking the diffusion of low molecular poly(ethylene glycol) in poly(ethylene oxide)-embedded HNPs as a model case, it was found that it took about 0.7 s for the solvent to diffuse through the 6 nm thick shell of HNPs and another 1.2 s to fill the inner cavity, while the diffusion coefficient was of the order of 1018 m2 s−1. The results demonstrate that the method can simultaneously measure solvent penetration into the polymer gel and into embedded sub-100 nm HNPs.