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CO2-Triggered Pickering Emulsion Based on Silica Nanoparticles and Tertiary Amine with Long Hydrophobic Tails
Langmuir ( IF 3.7 ) Pub Date : 2016-11-03 00:00:00 , DOI: 10.1021/acs.langmuir.6b03034 Yongmin Zhang 1 , Shuang Guo 1 , Wentao Wu 1 , Zhirong Qin 2 , Xuefeng Liu 1
Langmuir ( IF 3.7 ) Pub Date : 2016-11-03 00:00:00 , DOI: 10.1021/acs.langmuir.6b03034 Yongmin Zhang 1 , Shuang Guo 1 , Wentao Wu 1 , Zhirong Qin 2 , Xuefeng Liu 1
Affiliation
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We describe a strategy of fabricating CO2-triggered oil-in-water Pickering emulsion based on silica nanoparticles functionalized in situ by a trace amount of conventional CO2-switchable surfactant, N-(3-(dimethylamino)propyl)alkyl amide (CnPMA). By alternately bubbling CO2 and N2 at a moderate conditions (30 °C, 80 mL min–1), silica nanoparticles reversibly switch between amphipathic and hydrophilic as a result of the adsorption of ammonium (CO2) and the desorption of tertiary amine (N2). The emulsion can then be smart switched “on (stable)” and “off (unstable)”, along with homogenization, without needing cooling and heating. The switching of the current tertiary-based system is simple, moderate, and environmentally friendly, without contamination and the restriction of rigorous conditions. The surfactant concentration window of the Pickering emulsion is closely related to the length of hydrophobic tail, and the upper limit is no more than 0.20 cmc of that of the corresponding ammonium surfactant. Such a strategy is also suitable for commercial alkyl tertiary amines, without needing complicated organic synthesis.
中文翻译：
基于二氧化硅纳米粒子和叔胺的长疏水尾的CO 2引发的分拣机乳液
我们描述制造CO的策略2基于由常规CO痕量原位官能的二氧化硅纳米粒子-triggered油包水皮克林乳液2 -switchable表面活性剂，ñ - （3-（二甲基氨基）丙基）烷基酰胺（C n PMA）。通过在中等温度（30°C，80 mL min –1）下交替鼓泡CO 2和N 2，二氧化硅纳米颗粒由于铵盐（CO 2）的吸附和叔胺的解吸而可逆地在两亲性和亲水性之间切换。（N 2）。然后可以将乳化液智能化“开启（稳定）”和“关闭（不稳定）”以及均质化，而无需冷却和加热。当前的基于第三级的系统的切换简单，适度并且对环境友好，没有污染并且没有严格的条件限制。Pickering乳液的表面活性剂浓度窗口与疏水尾巴的长度密切相关，上限不超过相应的铵表面活性剂的0.20 cmc。这种策略也适用于商业烷基叔胺，而无需复杂的有机合成。
更新日期：2016-11-03
中文翻译：
基于二氧化硅纳米粒子和叔胺的长疏水尾的CO 2引发的分拣机乳液
我们描述制造CO的策略2基于由常规CO痕量原位官能的二氧化硅纳米粒子-triggered油包水皮克林乳液2 -switchable表面活性剂，ñ - （3-（二甲基氨基）丙基）烷基酰胺（C n PMA）。通过在中等温度（30°C，80 mL min –1）下交替鼓泡CO 2和N 2，二氧化硅纳米颗粒由于铵盐（CO 2）的吸附和叔胺的解吸而可逆地在两亲性和亲水性之间切换。（N 2）。然后可以将乳化液智能化“开启（稳定）”和“关闭（不稳定）”以及均质化，而无需冷却和加热。当前的基于第三级的系统的切换简单，适度并且对环境友好，没有污染并且没有严格的条件限制。Pickering乳液的表面活性剂浓度窗口与疏水尾巴的长度密切相关，上限不超过相应的铵表面活性剂的0.20 cmc。这种策略也适用于商业烷基叔胺，而无需复杂的有机合成。
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