Many ionic liquids (ILs) have good solubilities of CO₂ but the high viscosity of ILs makes them cumbersome and kinetically limits gas uptake. Encapsulation of ILs is an effective approach to overcoming these limitations. In capsules with a core of IL, the chemical composition of the shell impacts performance. Here, we report the preparation of capsules with a core of the IL [Bmim][PF₆] and polymer composite shell, then evaluate how the identity of the polymer impacts CO₂ uptake. IL-in-oil Pickering emulsions stabilized by nanosheets are used, with capsules formed by interfacial polymerization between different diamines and diisocyanates (e.g., shells are polyurea and nanosheets). The capsules contain 60–80 wt% IL and the composition was verified using Fourier transform infrared spectroscopy. Optical microscopy, scanning electron microscopy, and particle sizing data showed spherical, discrete capsules with 50–125 μm in diameter. All capsules are stable up to 250°C. Brunauer–Emmett–Teller analysis of CO₂ gas uptake data showed that different polymer compositions led to different CO₂ uptake properties, with capacity ranging from 0.065 to 0.025 moles of CO₂/kg sorbent at 760 torr and 20°C. This work demonstrates that the polymer identity of the shell impacts gas uptake properties and supports that shell composition can tailor performance.

中文翻译：

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具有聚脲壳和离子液体核的胶囊用于 CO2 捕获

许多离子液体 (IL) 具有良好的 CO ₂溶解度，但 IL 的高粘度使其笨重并且在动力学上限制了气体吸收。IL 的封装是克服这些限制的有效方法。在具有 IL 核心的胶囊中，外壳的化学成分会影响性能。在这里，我们报告了具有 IL [Bmim][PF ₆ ] 和聚合物复合壳核的胶囊的制备，然后评估聚合物的特性如何影响 CO ₂吸收。使用由纳米片稳定的油包皮克林乳液，通过不同二胺和二异氰酸酯之间的界面聚合形成胶囊（例如，壳是聚脲和纳米片）。胶囊含有 60–80 wt% 的离子液体，并且使用傅里叶变换红外光谱验证了其组成。光学显微镜、扫描电子显微镜和粒度数据显示直径为 50-125 μm 的球形离散胶囊。所有胶囊在高达 250°C 的温度下都是稳定的。CO的布鲁诺尔-埃米特-特勒分析₂气体吸收数据显示导致了不同的CO，不同的聚合物组合物₂的吸收性能，具有容量范围从0.065至0.025摩尔的CO ₂/kg 吸附剂在 760 托和 20°C。这项工作表明，外壳的聚合物特性会影响气体吸收性能，并支持外壳成分可以调整性能。