Transforming Porous Silica Nanoparticles into Porous Liquids with Different Canopy Structures for CO₂ Capture

Abstract

Porous liquids (PLs) have both liquid fluidity and solid porosity, thereby offering a variety of applications, such as gas sorption and separation, homogeneous catalysis, energy storage, and so forth. In this research, canopies with varying structures were utilized to modify porous silica nanoparticles to develop Type I PLs. According to experimental results, the molecular weight of canopies should be high enough to maintain the porous materials in the liquid state at room temperature. Characterization results revealed that PL_1_M2070 and PL_1_AC1815 displayed low viscosity and good fluidity. Both low temperature and high pressure positively influenced CO 2 capacity. The cavity occupancy resulted in poorer sorption capacity of PLs with branched canopies in comparison with that with linear canopies. Furthermore, the sorption capacity of PL_1_M2070 was 90.5% of the original CO 2 sorption capacity after 10 sorption/desorption cycles, indicating excellent recyclability.

Charge Shielding-Oriented Design of Zinc-Based Nanoparticle Liquids for Controlled Nanofabrication

“…This charge induces strong interparticle orientation and induction forces, leading to their solidification at room temperature. 2,8 In recent advances in nanomaterials, there have been several attempts to use high temperatures or modulating intermolecular forces to convert conventional solid materials into the flowing liquid state to achieve a new form of materials, including liquid cages, 9−13 liquid porous silica, 14,15 liquid carbon materials, 16,17 liquid metal−organic frameworks (MOFs), 18−21 and liquid zeolites. 22 However, these materials often comprise long polymeric chains or require high temperatures to weaken charge-induced interactions.…”

“…Metal-containing nanoparticles behave as solid powders because the high valence states of the metals are difficult to shield completely. This charge induces strong interparticle orientation and induction forces, leading to their solidification at room temperature. , In recent advances in nanomaterials, there have been several attempts to use high temperatures or modulating intermolecular forces to convert conventional solid materials into the flowing liquid state to achieve a new form of materials, including liquid cages, − liquid porous silica, , liquid carbon materials, , liquid metal–organic frameworks (MOFs), − and liquid zeolites . However, these materials often comprise long polymeric chains or require high temperatures to weaken charge-induced interactions. , Moreover, although these materials have shown performance advantages over their solid counterparts, their fluid properties and nanosized features as new concepts of liquefied nanomaterials have not been considered or applied in these explorations.…”

Design Principles Guiding Solvent Size Selection in ZIF-Based Type 3 Porous Liquids for Permanent Porosity

“…Porous liquids (PLs) are an emerging material that combines the fluidity of liquids with the intrinsic porosity of solids sorbents. − PLs are categorized into four classes or types. Type 1 PLs are neat liquids composed of discrete partials that contain pore space, such as surface-functionalized hollow silica nanospheres. − Type 2 PLs are formed from dissolved nanoporous macromolecules, such as porous organic cages or metal–organic polyhedra, in a sterically bulky solvent that is too large to occupy the pores. − Type 3 PLs are dispersions of solid porous materials, such as metal–organic frameworks (MOFs) or zeolites, in bulky solvents. − The final type, Type 4, is neat liquids formed from extended frameworks that maintain porosity in a liquified state …”