Static and dynamic light scattering studies of water‐in‐oil microemulsions in the critical region. Evidence of a crossover effect
Static and dynamic light scattering studies of water‐in‐oil microemulsions in the critical region. Evidence of a crossover effect
复制标题
关键区域油包水微乳液的静态和动态光散射研究。
DOI：
10.1063/1.455834
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发表时间：
1989
影响因子：
4.4
通讯作者：
Sh Chen
中科院分区：
文献类型：
--
作者：
J. Rouch;A. Safouane;P. Tartaglia;Sh Chen
对由水、癸烷和表面活性剂二乙基己基磺基琥珀酸钠（AOT）（WDA）组成的三组分微乳液体系进行了广泛的光散射测量，包括强度、浊度和线宽。临界和几个非临界混合物已被研究沿着恒定的微乳液液滴体积分数线在一个非常大的温度范围内的单相区域。在较低的相分离温度Tp附近，强度数据可以用标准的临界二元流体理论很好地解释，其短程关联长度为φ 0=（13.5±1.5）A。通过结合包括背景效应的模式耦合理论和适用于临界区域的线性模型状态方程，我们已经能够使用德拜截止长度q−1D来拟合动态光散射数据，德拜截止长度q−1D等于微乳液液滴的恒定平均直径。此外，我们发现明确的证据交叉从临界单粒子的行为在静态和动态光散射数据。已经确定了qD λ（Tx）=1时的交叉温度Tx。对动态光散射数据的分析表明，qD（只能在远离Tp的地方测量）实际上在整个温度范围内对控制临界动力学起着决定性的作用。广泛的光散射测量，包括强度、浊度和线宽，在由水、癸烷和表面活性剂二乙基己基磺基琥珀酸钠（AOT）（WDA）组成的三组分微乳液体系中进行，已作出。临界和几个非临界混合物已被研究沿着恒定的微乳液液滴体积分数线在一个非常大的温度范围内的单相区域。在较低的相分离温度Tp附近，强度数据可以用标准的临界二元流体理论很好地解释，其短程关联长度为φ 0=（13.5±1.5）A。通过结合包括背景效应的模式耦合理论和适用于临界区域的线性模型状态方程，我们已经能够使用德拜截止长度q−1D来拟合动态光散射数据，德拜截止长度q−1D等于微乳液液滴的恒定平均直径。另外，我们发现了明显的证据...
Extensive light scattering measurements, including the intensity, turbidity, and linewidth, on a three‐component microemulsion system consisting of mixtures of water, decane, and a surfactant sodium di‐2 ethylhexylsulfosuccinate (AOT) (WDA), have been made. The critical and several off‐critical mixtures have been studied along constant microemulsion droplet volume fraction lines in the one‐phase region over a very large temperature range. In the vicinity of the lower phase separation temperature Tp the intensity data are very well accounted for by the standard theory of critical binary fluids using a single value for the short range correlation length ξ0=(13.5±1.5) A. By combining a mode‐coupling theory including the background effects and a linear model equation of state applicable in the critical region, we have been able to fit the dynamic light scattering data using a Debye cutoff length q−1D which is equal to the constant average diameter of microemulsion droplets. Furthermore, we find clear evidence for a crossover from critical to single particle behavior in both static and dynamic light scattering data. A crossover temperature Tx has been identified at which qDξ(Tx)=1. Analyses of the dynamic light scattering data show that qD, which can only be measured far away from Tp, in fact plays a decisive role in controlling the critical dynamics in the whole temperature range.Extensive light scattering measurements, including the intensity, turbidity, and linewidth, on a three‐component microemulsion system consisting of mixtures of water, decane, and a surfactant sodium di‐2 ethylhexylsulfosuccinate (AOT) (WDA), have been made. The critical and several off‐critical mixtures have been studied along constant microemulsion droplet volume fraction lines in the one‐phase region over a very large temperature range. In the vicinity of the lower phase separation temperature Tp the intensity data are very well accounted for by the standard theory of critical binary fluids using a single value for the short range correlation length ξ0=(13.5±1.5) A. By combining a mode‐coupling theory including the background effects and a linear model equation of state applicable in the critical region, we have been able to fit the dynamic light scattering data using a Debye cutoff length q−1D which is equal to the constant average diameter of microemulsion droplets. Furthermore, we find clear evidence...