11/19/2023 0 Comments Spectra s9 reviews![]() ![]() Moreover, the supported non-porous substrate prevents the use of mesoporous sheet materials for substance filtration 14, 15, 16, 17, 18. And the obtained materials are usually coexistent with the original substrates or scaffolds, which results in the lack of flexibility. The commonly used strategies for preparing mesoporous sheet materials with narrow pore size distribution, such as chemical vapor deposition and electrochemical deposition, mainly rely on complicated synthetic procedures or complex equipment. ![]() Mesoporous sheet structure with proper pore size is highly preferred because of the highest surface utilization efficiency, minimized molecular diffusion within the porous structure, and the precise control of species size during filtration, which is of great challenge to achieve for zero-dimensional, one-dimensional and bulk materials and the commercial filtration materials 11, 12, 13. The filtration is performed by applying porous materials to selectively reject or pass molecules with different sizes. Molecule-level filtration has shown great potential in water purification, gas separation and pharmaceutical industries 8, 9, 10. Rational design and controllable synthesis of functional mesoporous materials with well-defined proper pore size and structure for the target application scenarios have been a long-pursued goal 5, 6, 7. Over the past decades, functional mesoporous materials with rich structures hold great potential in the fields of energy storage, catalysis technology, biomedicine, adsorption and separation owing to their characteristic properties such as high surface areas, controllable pore structures and pore sizes, large pore volumes, tunable morphologies and dimensions 1, 2, 3, 4. Experiments reveal that the obtained nanofiltration device shows remarkable gradient rejection rates (range from 23.5 to 99.9%) for molecules with different sizes (range from 1.2 to 4.4 nm). Owing to the good mono-dispersity, sheet structure and proper pore size, the designed gradient mesoporous hollow silica sheets can serve as flexible building blocks for fabricating nanoscale molecule filtration device. The obtained mesoporous silica layers possess narrow pore size distributions (~2.2 nm and ~6.6 nm). The modulated oil-water interface allows the assembly of gradient mesoporous silica layers on the water-removable ammonium sulfate crystals. Herein, an interfacial co-assembly strategy for gradient mesoporous hollow silica sheets is reported. Rational design and facile synthesis of functional mesoporous materials with sheet structure and gradient mesopores still face challenges of stacked structures and unadjustable pore sizes. Gradient porous structures enable the fast capillary-directed mass transport and enhance the chemical reaction rate with optimal efficiency and minimal energy consumption.
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