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Temperature-Switchable Surfactant-Free Microemulsion.
Langmuir ( IF 3.7 ) Pub Date : 2020-06-11 , DOI: 10.1021/acs.langmuir.0c00828
Yongmin Zhang 1 , Xuelian Chen 1 , Bo Zhu 1 , Yue Zhou 1 , Xuefeng Liu 1 , Cheng Yang 1
Affiliation  

Stimuli-responsive microemulsions have recently attracted significant interest due to their unique properties. Here, we developed a novel surfactant-free microemulsion (SFME) in a nontoxic ternary mixture, in which dimethyl sulfoxide (DMSO) was used as an amphisolvent, n-butanol was used as a nonpolar phase, and water was used as a polar phase. The DLS results confirmed the presence of the preouzo zone, and the polarity experiment revealed that the single-phase region can be further divided into oil-in-water, bicontinuous, and water-in-oil subregions. The size of droplets increased upon increasing the water or n-butanol content but decreased with increasing DMSO content. With increasing temperature, the area of the single-phase region increased, accompanied by a decrease in the size of the droplets, and the critical point moved to the corner of n-butanol. No matter in what subregion the formulation was found, decreasing temperature to below the phase-transition temperature (PTT) will induce a transition from monophasic MEs to complete phase separation and vice versa. This is mainly attributed to the effect of temperature on the hydrogen-bond interaction. Ag nanoparticles (Ag NPs) can be prepared above the PTT and facilely separated below PTT. The Ag NPs obtained from the current SFME showed higher catalytic activity than that obtained from a common surfactant-based ME.

中文翻译:

温度可转换的无表面活性剂的微乳液。

刺激响应性微乳剂由于其独特的性质最近引起了极大的兴趣。在这里,我们开发了一种新型的无毒三元混合物中的无表面活性剂微乳液(SFME),其中使用二甲基亚砜(DMSO)作为两性溶剂,使用正丁醇作为非极性相,使用水作为极性相。DLS结果证实了前偶氮带的存在,极性实验表明,单相区域可以进一步划分为水包油,双连续和油包水子区域。液滴的大小随水或正丁醇含量的增加而增加,但随DMSO含量的增加而减小。随着温度的升高,单相区域的面积增加,伴随着液滴尺寸的减小,临界点移到正丁醇的角落。无论在哪个子区域找到配方,将温度降低至相变温度(PTT)以下都会导致从单相ME过渡到完全相分离,反之亦然。这主要归因于温度对氢键相互作用的影响。可以在PTT上方制备Ag纳米粒子(Ag NPs),并在PTT下方轻松分离。从目前的SFME获得的Ag NPs的催化活性高于从普通的基于表面活性剂的ME获得的Ag NPs。这主要归因于温度对氢键相互作用的影响。可以在PTT上方制备Ag纳米粒子(Ag NPs),并在PTT下方轻松分离。从目前的SFME获得的Ag NPs的催化活性高于从普通的基于表面活性剂的ME获得的Ag NPs。这主要归因于温度对氢键相互作用的影响。可以在PTT上方制备Ag纳米颗粒(Ag NPs),并在PTT下方轻松分离。从目前的SFME获得的Ag NPs表现出比从普通的基于表面活性剂的ME获得的更高的催化活性。
更新日期:2020-07-07
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