pH-Responsive Pickering emulsions stabilized solely by surface-inactive nanoparticles via an unconventional stabilization mechanism,Soft Matter

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pH-Responsive Pickering emulsions stabilized solely by surface-inactive nanoparticles via an unconventional stabilization mechanism
Soft Matter ( IF 2.9 ) Pub Date : 2021-2-5 , DOI: 10.1039/d1sm00081k
Kangle Jia _{1,

2,

3,

4,

5} , Yongshun Guo _{1,

2,

3,

4,

5} , Yue Yu _{1,

2,

3,

4,

5} , Junjie Zhang _{1,

2,

3,

4,

5} , Longfei Yu _{1,

2,

3,

4,

5} , Wu Wen _{1,

2,

3,

4,

5} , Yuliang Mai _{1,

2,

3,

4,

5}

Affiliation

Using solely highly hydrophilic particles to stabilize emulsions, especially high internal phase emulsions, has always been an important challenge. Here pH-responsive Pickering emulsions stabilized by a low concentration of bare highly hydrophilic Ludox CL nanoparticles without surface modification or addition of surfactants are developed at neutral pH. The dispersed nanoparticles can be transformed into an aggregate state with a network-like structure near the isoelectric point, which contributes to the stabilization of the emulsions. Moreover, the vdW attraction between particles and droplets also plays a key role in the formation of emulsions, which can make the aggregated nanoparticles adsorb tightly around the droplets rather than penetrate the oil–water interface. The formed protective armor and network-like aggregates separate droplets from each other to prevent coalescence. At a low nanoparticle concentration (0.5 wt%), a high internal phase emulsion can be formed and can last up to half a year. This system can emulsify not only the hydrocarbon oil but also the fluoroalkane oil phase. Finally, organic–inorganic composite particles are fabricated using the template action of the Pickering emulsions. The method of preparing composite particles is more convenient than the traditional Pickering emulsion polymerization which often requires the modification of the surface of the hydrophilic particles or the addition of auxiliary monomers. This study provides a simple green strategy for the preparation of a more stable Pickering emulsion stabilized by surface-inactive nanoparticles and will broaden the scope of applications.

中文翻译：

pH响应性Pickering乳液通过非常规稳定机制仅由表面不活泼的纳米颗粒稳定

仅使用高度亲水的颗粒来稳定乳液，尤其是高内相乳液，一直是一个重要的挑战。在中性pH条件下，开发了通过低浓度的裸露的高度亲水性Ludox CL纳米颗粒稳定而无需表面改性或添加表面活性剂的pH响应型Pickering乳液。分散的纳米颗粒可以转变成在等电点附近具有网状结构的聚集态，这有助于乳液的稳定化。此外，颗粒和液滴之间的vdW吸引力在乳液的形成中也起着关键作用，这可以使聚集的纳米颗粒紧密地吸附在液滴周围，而不渗透到油水界面。形成的防护装甲和网状聚集体将液滴彼此分开，以防止聚结。在低纳米颗粒浓度（0.5 wt％）下，可以形成高内相乳液，并且可持续使用长达半年。该系统不仅可以乳化烃油，而且可以乳化氟代烷烃油相。最后，利用Pickering乳液的模板作用制备了有机-无机复合颗粒。制备复合颗粒的方法比传统的Pickering乳液聚合更方便，传统的Pickering乳液聚合通常需要对亲水颗粒的表面进行改性或添加辅助单体。

更新日期：2021-02-25

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