The controlled synthesis of mesoporous carbons (MCs) was achieved via a “silica-assisted” strategy under acid catalytic condition. The silica not only participates in co-assembly with resorcinol–formaldehyde (RF) to produce MCs, but also contributes to the increased porosity and controlled morphology of the resultant products. Interestingly, the morphology of the as-synthesized MCs can be controlled from bulk, spheres to apple-like morphology and the pore shape from ink-bottle-like to slitlike pores by varying the usage amount of SiO 2 . A possible “silica-assisted” mechanism of the formation of MCs is proposed. The protonated RF resin could get facilitative access to the gap of SiO 2 nanospheres, due to the H-bonding interaction, capillary force, and Coulombic interactions analogized to the “S + X − I + ” mechanism under acid condition. After carbonization and silica removal, the MCs with different morphologies are obtained. Nifedipine (NIP), as a model drug, was converted from a crystalline form to an amorphous state after being loaded into the MCs. The dissolution release rate of NIP was obviously improved, and the drug release results were fitted by the exponential function. Graphical
The schematic synthesis process of the MCs with various usage amounts of SiO 2
The widespread use of plastics, especially polyolefin including polyethylene and polypropylene, has led to severe environmental crises. Chemical recycling, a promising solution for extracting value from plastic waste, however, is underutilized due to its complexity. Here, a simple approach, silicone-assisted direct laser writing (SA-DLW) is developed, to upgrade polyolefin plastic waste into multifunctional porous graphene, called laser-induced graphene (LIG). This method involves infiltrating polyolefins with silicone, which retards ablation during the DLW process and supplies additional carbon atoms, as confirmed by experimental and molecular dynamic results. A remarkable conversion yield of 38.3% is achieved. The upgraded LIG exhibited a porous structure and high conductivity, which is utilized for the fabrication of diverse energy and electronic devices with commendable performance. Furthermore, the SA-DLW technique is versatile for upgrading plastic waste in various types and forms. Upgrading plastic waste in the form of fabric has significantly simplified pre-treatment. Finally, a wearable flex sensor is fabricated on the non-woven fabric of a discarded medical mask, which is applied for gesture monitoring. This work offers a simple but effective solution to upgrade plastic waste into valuable products, contributing to the mitigation of environmental challenges posed by plastic pollution.
The separator serves as a critical component in guaranteeing the electrochemical safety and operational reliability of lithium-ion batteries (LIBs). The aramid nanofiber (ANF) membrane-based separator is seen as a promising element for next-generation high-performance LIBs separators. However, the short-range intermolecular interactions within the network of ANFs lead to a highly entangled, extremely dense structure and a lack of porosity. In this study, a novel organic-inorganic separator was prepared in-situ by anchoring well-dispersed SiO 2 nanoparticles on the surface of ANFs. The diameter of the ANFs was reduced by retarding their oriented aggregation with SiO 2 , thereby effectively enhancing the porosity of the separator. The thermal stability and flame retardancy of the hybrid separators were significantly improved by the incorporation of SiO 2 ; moreover, the growth of Li dendrites on the anode surface was effectively suppressed compared with the pure ANFs and the commercial PP separators. The assembled LiFePO 4 /Li battery exhibits exceptional rate capability and stable cycling performance. The ANFs hybrid separator holds great potential as a candidate for high-performance LIBs.
危险品化学品经营许可证（带存储）