Semipermeable Elastic Microcapsules for Gas Capture and Sensing
Semipermeable Elastic Microcapsules for Gas Capture and Sensing
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DOI：
10.1021/acs.langmuir.6b02420
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发表时间：
2016-09-27
期刊：
影响因子：
3.9
通讯作者：
Manovic, Vasilije
中科院分区：
文献类型：
--
作者：
Nabavi, Seyed Ali;Vladisavljevic, Goran T.;Manovic, Vasilije
开发了用于气体捕获和传感的单分散微胶囊，其由可调节尺寸和厚度的弹性半渗透聚合物壳和pH敏感的气体选择性液体芯组成。使用玻璃毛细管微流体和连续的即时光聚合来生产微胶囊。内部流体是具有间甲酚紫的5-30重量% K2 CO 3溶液，中间流体是含有0-2重量% Dow Corning 749流体的UV可固化液体硅橡胶，外部流体是含有60-70重量%甘油和0.5-2重量%稳定剂（聚（乙烯醇）、吐温20或普朗尼克F-127）的水溶液。开发并验证了一种分析模型，用于根据储存和芯溶液的壳性质和渗透压摩尔浓度预测渗透压应力下胶囊的形态。实现完全壳聚合所需的最小能量密度和UV光辐照度分别为J.cm（-2）和mW.cm（-2）。在UV暴露后，在中间相中含有0.5重量% Dow Corning 749流体的胶囊的固化时间为30-40 min。30重量% K2 CO 3胶囊的CO2捕集能力为1.6-2 mmol/g，这取决于胶囊尺寸和壳厚度。当内部水被毛细吸力突然去除时，在核中观察到空化泡，而内部水的逐渐蒸发导致壳的屈曲。采用TGA、DSC和FTIR对壳进行了表征，壳的降解温度为450-460 ℃。
Monodispersed microcapsules for gas capture and sensing were developed consisting of elastic semipermeable polymer shells of tunable size and thickness and pH-sensitive, gas selective liquid cores. The microcapsules were produced using glass capillary microfluidics and continuous on-the-fly photopolymerization. The inner fluid was 5-30 wt % K2CO3 solution with m-cresol purple, the middle fluid was a UV-curable liquid silicon rubber containing 0-2 wt % Dow Corning 749 fluid, and the outer fluid was aqueous solution containing 60-70 wt % glycerol and 0.5-2 wt % stabilizer (poly(vinyl alcohol), Tween 20, or Pluronic F-127). An analytical model was developed and validated, for prediction of the morphology of the capsules under osmotic stress based on the shell properties and the osmolarity of the storage and core solutions. The minimum energy density and UV light irradiance needed to achieve complete shell polymerization were 2 J.cm(-2) and 13.8 mW.cm(-2), respectively. After UV exposure, the curing time for capsules containing 0.5 wt % Dow Corning 749 fluid in the middle phase was 30-40 min. The CO2 capture capacity of 30 wt % K2CO3 capsules was 1.6-2 mmol/g depending on the capsule size and shell thickness. A cavitation bubble was observed in the core when the internal water was abruptly removed by capillary suction, whereas a gradual evaporation of internal water led to buckling of the shell. The shell was characterized using TGA, DSC, and FTIR The shell degradation temperature was 450-460 degrees C.