Layer-by-layer Films Of Dual-pore Carbon Capsules With Designableselectivity Of Gas Adsorption

摘要

Establishing removal technologies of environmentally deleterious substances is currently one of the most urgent and important issues especially for removal of hydrophobic aromatic compounds, some of which are known to be potentially carcinogenic or mutagenic. Nanostructured materials with regular pore geometries, such as mesoporous materials, metal organic frameworks, and patterned films, have received much attention as effective media for materials sensing, sorption, and storage due to their huge surface areas and pore volumes per unit mass. On the other hand, nano- and microcapsules have been recently re-evaluated as attractive media for materials storage and drug delivery. Therefore, systems featuring a combination of the relevant characteristics, i.e., dual-pore core-shell materials with a capsule interior and nanoporous wall, should be ideal for materials' sequestration and/or storage. For these purposes, we have recently developed silica capsules possessing mesoporous walls and fabricated them into thin films for automodulated materials release using layer-by-layer (LbL) techniques. Subsequent efforts have recently resulted in the preparation of innovative carbon-based mesoporous capsules (dual-pore carbon capsule). In this work, the dual-pore carbon capsules were incorporated into an LbL assembly for adsorption of aromatic vapor phase guests (Figure 1). In addition, we have succeeded in tuning the guest selectivity of the carbon capsule film by impregnation of additional components, resulting in designable selectivity of volatile materials adsorption.