López-González M R, Holmes W M, Callaghan P T
MacDiarmid Institute for Advanced Materials and Nanotechnology, School of Chemical and Physical Sciences, Victoria University of Wellington, P.O. Box 600, New Zealand.
Wellcome Surgical Institute, University of Glasgow, Glasgow, United KingdomG61 1QH.
Soft Matter. 2006 Sep 19;2(10):855-869. doi: 10.1039/b600978f.
Using a combination of rheology and nuclear magnetic resonance (NMR) spectroscopy/velocimetry we demonstrate the existence of shear banding fluctuations under Couette flow of the micellar system 10% w/v cetylpyridinium chloride and sodium salicylate (CPyCl-NaSal) molar ratio 2 : 1 in 0.5 M NaCl in either HO or HO, using both time-averaged and real-time measurements. These shear banding fluctuations are consistent not only with the shear stress fluctuations observed in rheological measurements but also with fluctuations in the change of the constrained fraction of the amphiphile chain (Δ) observed in H-NMR spectroscopy experiments. Using H-NMR spectroscopy on a deuterated probe molecule (-decane) located in the wormlike micellar interior, direct measurement of the shear-induced nematic phase transition is reported.
我们使用流变学与核磁共振（NMR）光谱法/测速法相结合的方法，通过时间平均测量和实时测量，证明了在摩尔比为2:1的10% w/v十六烷基吡啶氯化物和水杨酸钠（CPyCl-NaSal）胶束体系于0.5 M NaCl的HO或HO中进行库埃特流动时，存在剪切带波动现象。这些剪切带波动不仅与流变学测量中观察到的剪切应力波动一致，还与H-NMR光谱实验中观察到的两亲链受限分数变化（Δ）的波动一致。通过对位于蠕虫状胶束内部的氘代探针分子（-癸烷）进行H-NMR光谱分析，报告了对剪切诱导向列相转变的直接测量结果。
