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Ligand-Shell Cooperativity in a Bilayer Silica-Sandwiched Mixed-Metals Nanocatalyst Design for Absolute Selectivity Switch.
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Creative Research Initiative Center for Nanospace-confined Chemical Reactions (NCCR), Pohang University of Science and Technology (POSTECH), Pohang 37673, Korea.
Unlike homogeneous metal complexes, achieving absolute control over reaction selectivity in heterogeneous catalysts remains a formidable challenge due to the unguided molecular adsorption/desorption on metal-surface sites. Conventional organic surface modifiers or ligands and rigid inorganic and metal-organic porous shells are not fully effective. Here, we introduce the concept of "ligand-porous shell cooperativity" to desirably reaction selectivity in heterogeneous catalysis.
View Article and Find Full Text PDFImpact of hydrodynamic cavitation-assisted microbubble with N, CO, and air on pasting, morphological, and thermal properties of starches from different botanical origins.
Int J Biol Macromol
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CAS Center for Excellence in Molecular Plant Sciences, Chinese Academy of Sciences, Shanghai 200032, China.
Microbubble-assisted starch modification (MASM) using different gases (N, CO and air) was employed to assess the effects of hydrodynamic cavitation (HC) on various botanical starches, including potato, wheat, corn and rice. SEM showed that N- and CO- microbubbles created more pronounced holes and cracks on the starch surfaces than air-microbubbles. The hydrodynamic cavitation-assisted microbubble (HCAM) treatment significantly reduced the amorphous and crystalline structures in potato and wheat starches, with less impact observed in corn and rice.
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Physics Postgraduate Program, Institute of Physics, University of Brasília, 70910-900 Brasília-DF, Brazil.
Two-dimensional (2D) nanomaterials are at the forefront of potential technological advancements. Carbon-based materials have been extensively studied since synthesizing graphene, which revealed properties of great interest for novel applications across diverse scientific and technological domains. New carbon allotropes continue to be explored theoretically, with several successful synthesis processes for carbon-based materials recently achieved.
View Article and Find Full Text PDFTopological Supramolecular Complexation of Metal-Organic Polyhedra for Tunable Interconnected Hierarchical Microporosity in Amorphous Form.
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South China University of Technology, South China Advanced Institute for Soft Matter Science and Technology, South China Advanced Institute for Soft Matter Science and Technology, 510640, Guangzhou, CHINA.
The precise engineering of microporosity is challenging due to the interference at sub-nm scale from unexpected structural flexibility and molecular packing. Herein, the concept of topological supramolecular complexation is proposed for the feasible fabrication of hierarchical microporosity with broad tunability in amorphous form. The 2.
View Article and Find Full Text PDFRecent Advances in Direct Synthesis of Functional Polymers of Intrinsic Microporosity Based on (Super)Acid Catalysis.
Macromol Rapid Commun
January 2025
Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun, 130022, China.
Polymers of intrinsic microporosity (PIMs) are an emerging class of amorphous organic porous materials with solution processability, which are widely used in a multitude of fields such as gas separation, ion conduction, nanofiltration, etc. PIMs have adjustable pore structure and functional pore wall, so it can achieve selective sieving for specific substances. In order to meet the functional requirements of PIMs, two principal methods are used to synthesize functional PIMs, namely, post-modification of PIMs precursors and functionalization of monomers.
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