Zang D Y, Rio E, Langevin D, Wei B, Binks B P
Laboratoire de Physique des Solides, Université Paris-Sud, UMR CNRS 8502, Bâtiment 510, 91405, Orsay cedex, France.
Eur Phys J E Soft Matter. 2010 Feb;31(2):125-34. doi: 10.1140/epje/i2010-10565-7. Epub 2010 Feb 13.
We have investigated the rheological behaviour of silica nanoparticle layers at the air-water interface. Both compressed and deposited layers have been studied in Langmuir troughs and with a bicone rheometer. The compressed layers are more homogeneous and rigid, and the elastic response to continuous, step and oscillatory compression are similar, provided the compression is fast enough and relaxation is prevented. The deposited layers are less rigid and more viscoelastic. Their shear moduli deduced from the oscillatory uniaxial compression are much smaller than those deduced from pure shear deformation suggesting that the effective shear rate is smaller than expected in the compression measurements.
我们研究了二氧化硅纳米颗粒层在空气-水界面的流变行为。在Langmuir槽中并使用双锥流变仪对压缩层和沉积层进行了研究。压缩层更均匀且更刚性，并且只要压缩足够快且防止松弛，对连续、阶跃和振荡压缩的弹性响应是相似的。沉积层刚性较小且更具粘弹性。从振荡单轴压缩推导出的它们的剪切模量比从纯剪切变形推导出的剪切模量小得多，这表明在压缩测量中有效剪切速率比预期的小。
