Abstract：
Layers of pulmonary lipids on an aqueous substrate at non-equilibrium conditions can decrease the surface tension of water to quite low values. This is connected with different relaxation processes occurring at the interface and the associated changes in the surface layer structure. Results of measurements by the combination of methods like surface rheology, ellipsometry, Brewster angle microscopy, and IRRAS for spread layers of lipid mixtures open a possibility to specify the dynamics of structural changes at conditions close to the physiological state. At sufficiently low surface tension values (below 5 mN/m) significant changes in the ellipsometric signal were observed for pure DPPC layers, which can be related to a transition from 2D to 3D structures caused by the layer folding. The addition of other lipids can accelerate the relaxation processes connected with squeezing-out of molecules or multilayer stacks formation hampering thereby a decrease of surface tension down to low values corresponding to the folding of the monolayer.
摘要：
在非平衡条件下，水性基质上的肺脂质层可以将水的表面张力降低到很低的值。这与界面处发生的不同弛豫过程以及表面层结构中的相关变化有关。通过表面流变学等方法的组合测量结果，椭圆光度法,布鲁斯特角显微镜,和IRRAS用于脂质混合物的散布层打开了在接近生理状态的条件下指定结构变化动力学的可能性。在足够低的表面张力值（低于5mN/m）下，观察到纯DPPC层的椭圆光度信号发生了显着变化，这可能与由图层折叠引起的从2D到3D结构的过渡有关。其他脂质的添加可以加速与分子的挤出或多层堆叠形成阻碍相关的松弛过程,从而将表面张力降低至对应于单层折叠的低值。
