A novel high efficiency nanocomposite sorbent for CO₂ capture has been developed based on oligomeric amine (polyethylenimine, PEI, and tetraethylenepentamine, TEPA) functionalized mesoporous silica capsules. The newly synthesized sorbents exhibit extraordinary capture capacity up to 7.9 mmol g⁻¹ under simulated flue gas conditions (pre-humidified 10% CO₂ ). The CO₂ capture kinetics were found to be fast and reached 90% of the total capacities within the first few minutes. The effects of the mesoporous capsule features such as particle size and shell thickness on CO₂ capture capacity were investigated. Larger particle size, higher interior void volume and thinner mesoporous shell thickness all improved the CO₂ capacity of the sorbents. PEI impregnated sorbents showed good reversibility and stability during cyclic adsorption–regeneration tests (50 cycles).

Continuous ongoing development of dense integrated circuits requires significant advancements in nanoscale patterning technology.