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4 results on '"Ganyin Yuan"'

1. Supramolecular Chiral Nanozymes with High and Switchable Enantioselectivity

Author

Chu Wang, Ganyin Yuan, Chao Wang, Xiaohuan Sun, Pengyuan Hang, Zheng Xi, Jie Han, and Rong Guo

Subjects
enantioselective reactions, magnetic iron oxide nanozymes, supramolecular chiral polyaniline, switchable enantioselectivities, Physics, QC1-999, Chemistry, QD1-999
Abstract

Understanding and manipulation of catalytic enantioselectivity have emerged as a paramount challenge for decades. Inspired by nature, nanozymes with enantioselectivity have been designed. However, the role of the spatial arrangement interplayed in enantioselective catalysis is rarely paid attention, let alone the manipulation of enantioselectivity switch under this context. Herein, the supramolecular chiral nanozymes composed of P/M‐polyaniline (P/M‐PANI) nanotwists and Fe3O4 nanoparticles without any chiral molecules are constructed. Taking the catalytic oxidation of 3,4‐dihydroxy‐d / l‐phenylalanine (d / l‐DOPA) as a model reaction, P‐PANI–Fe3O4 nanozymes are demonstrated to show better catalytic efficiency toward D‐DOPA, whereas M‐PANI–Fe3O4 nanozymes show preference to L‐DOPA. Intriguingly, through the simple modulation of the Fe3O4 nanoparticle density on P/M‐PANI–Fe3O4, the unprecedented enantioselectivity switch of the as‐designed nanozymes is achieved. Moreover, the select factors of P/M‐PANI–Fe3O4 toward d / l‐DOPA are determined to be significantly larger than that of commonly used chiral ligands (such as d / l‐phenylalanine)‐modified Fe3O4 nanozymes, indicating the superiority of spatial arrangement‐dominated supramolecular chirality over molecular chirality in enantioselectivity. This finding discloses the role that the spatial arrangement‐directed chiral scaffolds interplay in the enzymatic catalytic process and open a new avenue for the facile design of smart nanozymes with controlled enantioselectivity.

Published
2023
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3. Dictating catalytic performance of platinum-iron nanoparticle by regulating its heterogeneous interface and stability

Author

Jia Sun, Ganyin Yuan, Xiaohuan Sun, Jie Han, Jun Hu, and Rong Guo

Subjects
Materials science, Nanostructure, Iron, Oxide, chemistry.chemical_element, Nanoparticle, Catalysis, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, Biomaterials, Iron nanoparticle, chemistry.chemical_compound, Colloid and Surface Chemistry, X-ray photoelectron spectroscopy, chemistry, Chemical engineering, Nanoparticles, Platinum, Carbon, Oxidation-Reduction
Abstract

Innovative design of nanocatalyst with high activity remains to be great challenge. Platinum (Pt) nanoparticle has already demonstrated to be excellent candidates in the field of catalysis. However, the scarcity and high price significantly hinder its large-scale production. In this work, dumbbell-like alloying nanoparticle of platinum-iron/ferroferric oxide (PtFe Fe3O4) was prepared. On one hand, the design of the alloying nanoparticle can manipulate the d-band center of Pt, in further, the interaction with substrates. In addition, the dumbbell-like structured PtFe Fe3O4 can offer heterogeneous interface, of which the interaction between PtFe and Fe3O4, supported by the X-ray photoelectron spectroscopic (XPS) results, leads to the enhanced catalytic efficiency. On the other hand, the introduction of Fe (iron) composition largely decreases the necessary amount of Pt, leading to efficient cost reduction. Moreover, to avoid the aggregation related activity attenuation problem, PtFe Fe3O4 nanoparticle located in cavity of nitrogen heteroatom-doped carbon shell (PtFe Fe3O4@N C) as yolk@shell nanostructure was constructed and its improved catalytic performance was demonstrated towards the reactions of 4-nitrophenol (4-NP) reduction, β-ionone and benzhydrol oxidation.

Published
2021

4. Rational design of dumbbell-like Au-Fe3O4@Carbon yolk@shell nanospheres with superior catalytic activity

Author

Rong Guo, Ganyin Yuan, Jun Hu, Jie Han, Xiaohuan Sun, and Jia Sun

Subjects
Materials science, Dumbbell like, Rational design, Shell (structure), Nanoparticle, chemistry.chemical_element, Nanotechnology, 02 engineering and technology, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, Nanomaterial-based catalyst, 0104 chemical sciences, Catalysis, Colloid and Surface Chemistry, chemistry, 0210 nano-technology, Carbon
Abstract

Dumbbell-like Au-Fe3O4 nanoparticles are emerging as attractive nanocatalysts in recent years. However, they still suffer from the instability related activity attenuation. Herein, dumbbell-like Au-Fe3O4 nanoparticles encapsulated in N-doped carbon shell (Au-Fe3O4@Carbon) as novel yolk@shell nanocatalysts were synthesized via template assisted method, with which the yolk@shell scaffolds and even the diameter of the hollow space is totally designable. The yolk@shell structured Au-Fe3O4@Carbon was demonstrated to exhibit high stability and enhanced activity towards the reduction of 4-nitrophenol. Moreover, 100% yield was determined for the benzhydrol oxidation reaction taking advantage of the as prepared Au-Fe3O4@Carbon yolk@shell nanocatalysts. Furthermore, the Au-Fe3O4@Carbon nanocatalysts presented herein exhibit superior recyclability, which laid the foundation for its practical application. The mechanism for the enhanced catalytic behavior were clearly addressed. It is anticipated that the elaborate design of this work can lead to the exploration of novel nanocatalysts with superior catalytic performance.

Published
2021
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