Using a Molecular Stopwatch to Study Particle Uptake in Pickering Emulsions.

Using a Molecular Stopwatch to Study Particle Uptake in Pickering Emulsions.
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使用分子秒表研究皮克林乳液中的颗粒吸收。

DOI:
10.1021/acs.langmuir.6b01474
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发表时间:
2016
期刊:
the ACS journal of surfaces and colloids
影响因子:
--
通讯作者:
Forth J
Forth J
中科院分区:
--
文献类型:
--
作者:
Forth J

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胶体PMMA颗粒与界面组装的ph可切换脂质膜(磷酸氢十四烷基铵,TAHP)结合形成具有复合界面的乳状液滴。两个时间尺度决定了系统的界面结构和液滴大小:颗粒吸附速率和膜组装速率。我们通过改变颗粒大小(在颗粒的情况下)和水溶液pH值(在脂质膜的情况下)来调整这两个时间尺度。研究了三种膜组装速率:快速(pH 5),缓慢(pH 7)和非活性(pH 9)。在pH为5时,形成了包覆混合界面结构的小液滴,增大颗粒体积分数并不会改变液滴的大小。在pH为7时,TAHP膜组装的动力学减慢导致颗粒尺寸对液滴尺寸有系统的影响:颗粒越小,液滴越小。在pH为9时,TAHP在体系中不起作用,并且观察到更熟悉的皮克林乳状液。最后,我们证明了在pH为5时,我们的系统可以很容易地调节界面颗粒密度和液滴大小。这为合理设计具有可调界面结构的胶囊和乳液液滴提供了潜在的应用前景。
Colloidal PMMA particles and an interfacially assembled, pH-switchable lipid film (tetradecylammonium hydrogen phosphate, TAHP) were combined to form emulsion droplets with composite interfaces. Two time scales govern the interfacial structure and droplet size of the system: the rate of particle adsorption and the rate of film assembly. We tune these two time scales by varying the particle size (in the case of the particles) and aqueous pH (in the case of the lipid film). Three rates of film assembly are studied: rapid (pH 5), slow (pH 7), and inactive (pH 9). At pH 5, small droplets coated with a mixed interfacial structure are formed, and increasing particle volume fraction does not change the droplet size. At pH 7, the slowed kinetics of TAHP film assembly results in the particle size having a systematic effect upon droplet size: the smaller the particles, the smaller the droplets. At pH 9, TAHP plays no role in the system, and more familiar Pickering emulsions are observed. Finally, we show that at pH 5 both the interfacial particle density and droplet size can be readily tuned in our system. This suggests potential applications in the rational design of capsules and emulsion droplets with tunable interfacial structure.
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