AOT microemulsions: droplet size and clustering in the temperature range between the supercooled state and the upper phase boundary
AOT microemulsions: droplet size and clustering in the temperature range between the supercooled state and the upper phase boundary
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DOI：
10.1039/c3sm51632f
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发表时间：
2013-01-01
期刊：
影响因子：
3.4
通讯作者：
Stuehn, Bernd
中科院分区：
文献类型：
--
作者：
Domschke, Markus;Kraska, Martin;Stuehn, Bernd
本文主要利用小角X射线散射（SAXS）研究了水-AOT（琥珀酸双（2-乙基己基）酯磺酸钠）-癸烷微乳液在过冷态和上相界之间的液滴聚集机理和结构。我们详细研究了液滴体积分数φ = 0.1-0.4和水/AOT摩尔比ω = 5-40时的温度依赖性液滴结构和尺寸。我们发现在不同的温度下，液滴尺寸的变化，并解释我们的结果所覆盖的AOT分子（两相边界之间）和宏观相分离的水冰低于一定的过冷温度的有效液滴表面的变化。我们监测液滴相互作用的连续变化的现象学结构因子相结合的硬球相互作用与洛伦兹函数占液滴密度波动的系统。我们分析了依赖于phi和omega的液滴聚集体，从而更好地理解随着温度的升高液滴聚集。
The main focus of this work is the investigation of the mechanism of droplet aggregation and the droplet structure of water-AOT (sodium bis(2-ethyl hexyl) sulfosuccinate)-decane microemulsions between the supercooled state and the upper phase boundary by means of SAXS. We study the temperature dependent droplet structure and size in detail at compositions of droplet volume fractions phi = 0.1-0.4 and water/AOT molar ratios of omega = 5-40. We found a change in droplet size at varying temperatures and explain our results by the change of the effective droplet surface covered by an AOT molecule (between the two phase boundaries) and by macro-phase separated water ice below a certain supercooling temperature. We monitor the continuous change of droplet interaction by means of a phenomenological structure factor combining hard sphere interactions with a Lorentzian function accounting for droplet density fluctuations in the system. We analyse the droplet aggregates in dependency on phi and omega leading to a better understanding of droplet aggregation with increasing temperature.