Pathway of the shear-induced transition between planar lamellae and multilamellar vesicles as studied by time-resolved scattering techniques
Pathway of the shear-induced transition between planar lamellae and multilamellar vesicles as studied by time-resolved scattering techniques
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通过时间分辨散射技术研究平面片层和多层囊泡之间剪切诱导的转变路径
DOI：
10.1021/la026654y
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发表时间：
2003
期刊：
影响因子：
3.9
通讯作者：
W. Richtering
中科院分区：
文献类型：
--
作者：
Florian Nettesheim;J. Zipfel;U. Olsson;F. Renth;Peter Lindner;W. Richtering
本文报道了在两种非离子表面活性剂体系中，即40wt%的三甘醇单癸基醚（C10 E3）和40wt%的四甘醇单十二烷基醚（C12 E4）的D2 O溶液中，剪切诱导的从定向层状相（Lα相）到多层囊泡（MLV）的转变。这种转变进行了研究的时间分辨小角中子和剪切下的光散射。在25 °C下，在2 ~ 100 s-1的剪切速率范围内，C_（10）E_3体系从Lα相到MLV相的转变明显受应变控制。这种转变涉及到一个中间结构与圆柱散射对称。这可以被解释为多层圆柱（MLC）或作为一个连贯的条纹屈曲与波矢量的波动在中性方向。当剪切关闭时，发现沿着过渡路径的中间结构长时间稳定。这允许对被困中间结构和实验的研究，其中不同的位置内...
We report on the shear-induced transition from an oriented lamellar phase (Lα phase) to multilamellar vesicles (MLV) in two nonionic surfactant systems, namely, a 40 wt % sample of triethylene glycol monodecyl ether (C10E3) and a 40 wt % sample of tetraethylene glycol monododecyl ether (C12E4) in D2O. This transition was studied by time-resolved small-angle neutron and light scattering under shear. Within a range of shear rates from 2 to 100 s-1 at 25 °C the transition from the Lα phase to MLVs in the C10E3 system apparently is controlled by strain. This transition involves an intermediate structure with cylindrical scattering symmetry. This can be interpreted as multilamellar cylinders (MLCs) or as a coherent stripe buckling with the wave vector of the undulation in a neutral direction. The intermediate structures found along the transition path are stable for long times, when shear is turned off. This allows for studies on trapped intermediate structures and experiments where different positions within ...