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基于开关型活性Al2O3纳米颗粒稳定的新型CO2/N2响应型Pickering乳液
An Chen, Duo Wang, Jingsi Chen, Jianhong Xu, Hongbo Zeng
工程（英文） ›› 2022, Vol. 12 ›› Issue (5) : 48-54.
PDF(1651 KB)
PDF(1651 KB)
基于开关型活性Al2O3纳米颗粒稳定的新型CO2/N2响应型Pickering乳液
A CO2/N2-Responsive Pickering Emulsion Stabilized by Novel Switchable Surface-Active Alumina Nanoparticles
本文报道了一种新型开关型Pickering乳液，这种乳液具有快速的CO2/N2响应能力，可以通过静电作用使氧化铝纳米颗粒与微量的开关型超亲合剂进行原位疏水稳定。在引入CO2 30 s 后，Pickering乳液可以自发地破乳化，并实现完全的相分离；然后乳液可以在N2吹扫10 min后的均质化过程中得到重构。此外，稳定的Pickering乳液可以在室温下储存60 d以上而没有任何可见的变化。开关型Pickering乳液的CO2/N2响应行为归因于在CO2或N2交替鼓泡时，开关型表面活性剂在氧化铝纳米颗粒表面的可逆的解吸/吸附。由于表面活性剂的制造简便性和氧化铝纳米颗粒的疏水性，本研究开发了一种极其简便且具有成本效益的方法，用于制备可快速响应CO2/N2的开关型Pickering 乳液。与以前的研究中使用的剂量相比，开关型表面活性剂的剂量显著减少为原来的1/1500（从150 mmol∙L−1减少到0.1 mmol∙L−1）。此外，所制备的具有CO2/N2响应能力的开关型Pickering乳液对环境友好、温和、无毒；因此，该乳液具有巨大的实际应用潜力，并且具有可观的经济和环境效益，可应用于石油运输、化石燃料生产、环境气体检测以及活性成分的封装和释放。
This article reports the development of a novel switchable Pickering emulsion with rapid CO2/N2 responsiveness, which is stabilized using alumina nanoparticles hydrophobized in situ with a trace amount of a switchable superamphiphile via electrostatic interactions. With the introduction of CO2 for 30 s, the Pickering emulsion can be spontaneously demulsified with complete phase separation; the emulsion can then be reconstructed in response to N2 purging for 10 min followed by homogenization. Moreover, the stable Pickering emulsion can be stored for more than 60 days at room temperature without any visible change. The CO2/N2-responsive behavior of the switchable Pickering emulsion is attributed to the reversible desorption/adsorption of the switchable surfactants on the surfaces of the alumina nanoparticles upon the alternative bubbling of CO2 or N2. Thanks to the simple fabrication of the surfactant and the hydrophobization of the alumina nanoparticles, this research has developed an extremely facile and cost-efficient method for preparing a rapidly CO2/N2-responsive switchable Pickering emulsion. The dosage of the switchable surfactants has been significantly reduced by nearly 1500 times (from 150 to 0.1 mmol∙L−1) as compared with the dosage used in previous studies. Moreover, the as-prepared CO2/N2-responsive switchable Pickering emulsion is environmentally friendly, mild, and nontoxic; thus, it holds great potential for practical applications with considerable economic and environmental benefits, such as oil transport, fossil fuel production, environmental gases detection, and the encapsulation and release of active ingredients.
CO2/N2刺激响应 / Pickering乳液 / 开关型表面活性剂 / 氧化铝纳米颗粒 / 超两亲化合物
CO2/N2 responsive / Pickering emulsion / Switchable surfactant / Alumina nanoparticles / Superamphiphile
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