Laboratoire de Physique des Solides, Université Paris-Sud, UMR CNRS 8502, Bâtiment 510, 91405 Orsay cedex, France.
Phys Chem Chem Phys. 2009 Nov 7;11(41):9522-9. doi: 10.1039/b907903c. Epub 2009 Sep 16.
We have studied silica nanoparticle layers spread at the air/water interface. The surface pressure of the layers has been determined in a Langmuir trough via two orthogonal Wilhelmy plates. We observed significant differences in surface pressure according to the preparation protocol: layers spread then compressed or layers obtained after successive spreading steps. We also studied the two types of layers by multiple angle of incidence ellipsometry. We introduce a two-layer model which enables us to evaluate the radius of interfacial aggregates and their contact angle with the air/water interface.
我们研究了铺展在空气/水界面的二氧化硅纳米颗粒层。我们通过两个正交的威尔海姆板在兰格缪尔槽中测定了层的表面压力。我们观察到根据不同的制备方案，表面压力有显著差异：铺展后压缩的层或连续铺展步骤得到的层。我们还通过多角度入射椭圆偏振法研究了这两种类型的层。我们引入了一个两层模型，该模型使我们能够评估界面聚集体的半径及其与空气/水界面的接触角。
