浓胶体分散体系中吸附聚合物结构的小角中子散射研究
A small-angle neutron scattering study of adsorbed polymer structure in concentrated colloidal dispersions.
作者信息
Qiu Dong, Flood Charlie, Cosgrove Terence
机构信息
School of Physical Sciences, University of Kent, Canterbury CT2 7NH, United Kingdom.
出版信息
Langmuir. 2008 Apr 1;24(7):2983-6. doi: 10.1021/la800023d. Epub 2008 Feb 28.
Poly(ethylene oxide) (PEO) adsorption on colloidal silica particles was studied by small-angle neutron scattering under the core-contrast-matching condition. The volume fraction profile of the adsorbed layer was derived by modeling the average layer scattering term. It was found that, with increasing colloid concentration, the adsorbed PEO layers collapse due to the repulsions between adsorbed layers on neighboring particles. At the same time, the correlation length in the adsorbed layer obtained by fitting the layer fluctuation scattering term was found to decrease, indicating that denser polymer layers are formed. These two observations are self-consistent.
在核对比匹配条件下，通过小角中子散射研究了聚环氧乙烷（PEO）在胶体二氧化硅颗粒上的吸附。通过对平均层散射项进行建模，得出了吸附层的体积分数分布。研究发现，随着胶体浓度的增加，吸附的PEO层由于相邻颗粒上吸附层之间的排斥作用而坍塌。同时，通过拟合层涨落散射项得到的吸附层中的相关长度减小，这表明形成了更致密的聚合物层。这两个观察结果是自洽的。
Zotero 插件