Abstract In this work, a gemini-surfactant (i.e. sodium dilauramino cysteine, SDLC) stabilized high internal phase emulsion (HIPE) template was utilized to prepare monolithic polyHIPEs of chitosan-g-polyacrylamide (CT-g-PAAm) for the first time. The influences of internal phase fraction and emulsifier concentration on the porous structures were studied. The morphologies of polyHIPEs were observed via scanning electron microscope (SEM) while structure parameters were investigated by combining nitrogen adsorption/desorption measurements with mercury intrusion porosimetry (MIP). Highly porous polyHIPEs of CT-g-PAAm with porosity varying from 86 to 93% were obtained at different internal phase fractions. PolyHIPEs were also prepared using Tween 20 as the emulsifier for comparison. It was found the polyHIPE using SDLC emulsifier (S-polyHIPE) showed higher porosity and consequent smaller foam density than that using Tween 20 emulsifier (T-polyHIPE), implying the gemini-surfactant can act as a novel type of promising emulsifier for the preparation of porous polyHIPEs. In addition, the adsorption performances of polyHIPEs were evaluated by adsorbing methylene blue (MB). At the same internal phase fraction, S-polyHIPE showed higher adsorption capacity and faster adsorption rate than T-polyHIPE. The adsorption data were analyzed by isotherm models and dynamic models, respectively. The results indicated that the adsorption occurs as a monolayer on the adsorbent surface with equal adsorption sites.

中文翻译：

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Gemini 表面活性剂介导的 HIPE 模板用于制备具有良好吸附性能的高多孔整体壳聚糖-g-聚丙烯酰胺

摘要 在这项工作中，首次利用双子表面活性剂（即二月桂氨基半胱氨酸钠，SDLC）稳定的高内相乳液（HIPE）模板制备了壳聚糖-g-聚丙烯酰胺（CT-g-PAAm）的整体聚HIPE。研究了内相分数和乳化剂浓度对多孔结构的影响。通过扫描电子显微镜 (SEM) 观察聚 HIPE 的形态，同时通过将氮吸附/解吸测量与压汞孔隙率 (MIP) 相结合来研究结构参数。在不同的内相分数下获得了孔隙率从 86% 到 93% 不等的 CT-g-PAAm 的高度多孔 polyHIPE。为了比较，还使用吐温 20 作为乳化剂制备了 PolyHIPE。发现使用 SDLC 乳化剂 (S-polyHIPE) 的 polyHIPE 显示出比使用吐温 20 乳化剂 (T-polyHIPE) 更高的孔隙率和更小的泡沫密度，这意味着双子表面活性剂可以作为一种新型的有前途的乳化剂用于制备多孔 polyHIPE。此外，polyHIPEs 的吸附性能通过吸附亚甲蓝 (MB) 来评估。在相同的内相分数下，S-polyHIPE 表现出比 T-polyHIPE 更高的吸附容量和更快的吸附速率。吸附数据分别通过等温线模型和动力学模型进行分析。结果表明，吸附在吸附剂表面以单层形式发生，具有相同的吸附位点。这意味着双子表面活性剂可以作为一种新型的有前途的乳化剂，用于制备多孔聚 HIPE。此外，polyHIPEs 的吸附性能通过吸附亚甲蓝 (MB) 来评估。在相同的内相分数下，S-polyHIPE 表现出比 T-polyHIPE 更高的吸附容量和更快的吸附速率。吸附数据分别通过等温线模型和动力学模型进行分析。结果表明，吸附在吸附剂表面以单层形式发生，具有相同的吸附位点。这意味着双子表面活性剂可以作为一种新型的有前途的乳化剂，用于制备多孔聚 HIPE。此外，polyHIPEs 的吸附性能通过吸附亚甲蓝 (MB) 来评估。在相同的内相分数下，S-polyHIPE 表现出比 T-polyHIPE 更高的吸附容量和更快的吸附速率。吸附数据分别通过等温线模型和动力学模型进行分析。结果表明，吸附在吸附剂表面以单层形式发生，具有相同的吸附位点。S-polyHIPE 表现出比 T-polyHIPE 更高的吸附能力和更快的吸附速率。吸附数据分别通过等温线模型和动力学模型进行分析。结果表明，吸附在吸附剂表面以单层形式发生，具有相同的吸附位点。S-polyHIPE 表现出比 T-polyHIPE 更高的吸附能力和更快的吸附速率。吸附数据分别通过等温线模型和动力学模型进行分析。结果表明，吸附在吸附剂表面以单层形式发生，具有相同的吸附位点。