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CAPSULES WITH CORES OF IONIC LIQUID AND POLYUREA SHELLS FOR CO2 CAPTURE
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In the wake of climate change due to global warming, it is becoming increasingly critical to manage greenhouse gases. Ionic liquids (ILs) have shown to be effective materials for CO2 uptake but are limited in practical use by their high viscosity and difficult handling; encapsulation is an effective method to improve handling. The chemical composition of the shell that is used to encapsulate the IL is a vital component of the capsule that impacts the properties and performance. This project focuses on encapsulating an IL ([Bmim][PF6]) in a composite polymer shell and identifying how the shell composition impacts CO2 capture. Herein, six monomer pairs (diamines and diisocyanates) are used for encapsulating the IL, leveraging interfacial polymerization (polyurea formation) and Pickering emulsion template with modified graphene oxide nanosheets as the surfactant. Verified using FTIR and 1H NMR spectroscopies, the capsules contained 60-80 wt% IL. Optical microscopy, scanning electron microscopy and particle sizing data showed that mostly spherical, discrete capsules are present with an average diameter of 50 µm to 125 µm. Thermal stability was analyzed using thermogravimetric analysis (TGA) which shows that all capsules are stable up to 250 ℃. BET analysis of CO2 gas uptake data shows that different polymer components led to different CO2 uptake properties. For instance, the CO2 uptake capacity at 760 torr ranged from 0.065 to 0.025 moles of CO2/kg sorbent. This work demonstrates that tailored polymer composition of the shell can be used to tune the performance of encapsulated ILs in CO2 uptake.
Subjectionic liquids, interfacial polymerization, graphene oxide, Pickering emulsion, encapsulation, CO2 capture.
Gaur, Samanvaya Singh (2021). CAPSULES WITH CORES OF IONIC LIQUID AND POLYUREA SHELLS FOR CO2 CAPTURE. Master's thesis, Texas A&M University. Available electronically from