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Nanomaterials
Special Issues
Semi-heterogeneous Metal Nanoparticles for Catalytic Applications
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Semi-heterogeneous Metal Nanoparticles for Catalytic Applications

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Energy and Catalysis".

Deadline for manuscript submissions: closed (30 November 2023) | Viewed by 6269

Special Issue Editor

Prof. Dr. Young-Seok Shon

E-Mail Website
Guest Editor
Department of Chemistry and Biochemistry and KEMP, California State University Long Beach, Long Beach, CA, USA
Interests: solution-phase synthesis and catalysis of metal nanoparticles and nanoparticle hybrids: selective catalysis and enzyme site mimics; micelle-like nanoparticles for green catalysis; liposome-encapsulated metal nanoparticles for biocatalysis; metal nanoparticle hybrids for photoenhanced catalysis
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Ligand-capped metal nanoparticles that have intrinsically heterogeneous surface characteristics can be semi-heterogeneous catalysts when the reactions are performed in the homogeneous solution phase. Since semi-heterogeneous catalysts benefit from the advantages that both homogeneous and heterogeneous catalysts have, they can be not only more active than but also much more recyclable than their bulk and heterogeneous counterparts. In addition, ligand-capped metal nanoparticle catalysts have shown greater selectivity than supported nanoparticle catalysts. Examples of semi-heterogeneous nanoparticle catalysts include, but are not limited to, dendrimer- or polymer-nanoparticle hybrids, ligand-capped nanoparticles, surfactant- or ionic liquid-stabilized nanoparticles, and biomolecule–nanoparticle hybrids. We welcome both original research and review articles that seek to advance the fundamental understanding of the relationship between the catalytic properties and the structure/composition of semi-heterogeneous nanoparticles. This Special Issue of Nanomaterials will also attempt to cover the recent advancements in the semi-heterogeneous metal nanoparticles for various catalysis applications ranging from simple organic reactions and electron-transfer reactions to industrial catalysis including alternative fuel and wastewater remediation.

Prof. Dr. Young-Seok Shon
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Nanomaterials is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • nanoparticles
  • ligands
  • catalysis
  • organic reactions
  • semi-heterogeneous
  • metal-catalyzed reactions

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Published Papers (2 papers)

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Research

13 pages, 4798 KiB  
Article
Integration of Gold Nanoparticles into Crosslinker-Free Polymer Particles and Their Colloidal Catalytic Property
by Jian Hou, Bin Li, Wongi Jang, Jaehan Yun, Faith M. Eyimegwu and Jun-Hyun Kim
Nanomaterials 2023, 13(3), 416; https://doi.org/10.3390/nano13030416 - 19 Jan 2023
Cited by 5 | Viewed by 2495
Abstract
This work demonstrates the incorporation of gold nanoparticles (AuNPs) into crosslinker-free poly(N-isopropylacrylamide), PNIPAM, particles in situ and the examination of their structural and catalytic properties. The formation process of the AuNPs across the crosslinker-free PNIPAM particles are compared to that of crosslinked PNIPAM [...] Read more.
This work demonstrates the incorporation of gold nanoparticles (AuNPs) into crosslinker-free poly(N-isopropylacrylamide), PNIPAM, particles in situ and the examination of their structural and catalytic properties. The formation process of the AuNPs across the crosslinker-free PNIPAM particles are compared to that of crosslinked PNIPAM particles. Given the relatively larger free volume across the crosslinker-free polymer network, the AuNPs formed by the in situ reduction of gold ions are detectably larger and more polydisperse, but their overall integration efficiency is slightly inferior. The structural features and stability of these composite particles are also examined in basic and alcoholic solvent environments, where the crosslinker-free PNIPAM particles still offer comparable physicochemical properties to the crosslinked PNIPAM particles. Interestingly, the crosslinker-free composite particles as a colloidal catalyst display a higher reactivity toward the homocoupling of phenylboronic acid and reveal the importance of the polymer network density. As such, the capability to prepare composite particles in a controlled polymer network and reactive metal nanoparticles, as well as understanding the structure-dependent physicochemical properties, can allow for the development of highly practical catalytic systems. Full article
(This article belongs to the Special Issue Semi-heterogeneous Metal Nanoparticles for Catalytic Applications)
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13 pages, 4770 KiB  
Article
Water-Soluble Pd Nanoparticles for the Anti-Markovnikov Oxidation of Allyl Benzene in Water
by Edwin Avila, Christos Nixarlidis and Young-Seok Shon
Nanomaterials 2023, 13(2), 348; https://doi.org/10.3390/nano13020348 - 14 Jan 2023
Cited by 3 | Viewed by 3161
Abstract
The catalytic activity and selectivity of two different water-soluble palladium nanoparticles capped with 5-(trimethylammonio)pentanethiolate and 6-(carboxylate)hexanethiolate ligands are investigated using the catalytic reaction of allyl benzene. The results show that the regioselective transformation of allyl benzene to 3-phenylpropanal occurs at room temperature and [...] Read more.
The catalytic activity and selectivity of two different water-soluble palladium nanoparticles capped with 5-(trimethylammonio)pentanethiolate and 6-(carboxylate)hexanethiolate ligands are investigated using the catalytic reaction of allyl benzene. The results show that the regioselective transformation of allyl benzene to 3-phenylpropanal occurs at room temperature and under atmospheric pressure in neat water via a Tsuji–Wacker type oxidation. Conventionally, the Tsuji–Wacker oxidation promotes the Markovnikov oxidation of terminal alkenes to their respective ketones in the presence of dioxygen. Water-soluble Pd nanoparticles, however, catalyze the anti-Markovnikov oxidation of allyl benzene to 3-phenylpropanal in up to 83% yields. Catalytic results of other aromatic alkenes suggest that the presence of benzylic hydrogen is a key to the formation of a p-allyl Pd intermediate and the anti-Markovnikov addition of H2O. The subsequent b-H elimination and tautomerization contribute to the formation of aldehyde products. Water-soluble Pd nanoparticles are characterized using nuclear magnetic resonance (NMR), UV–vis spectroscopy, thermogravimetric analysis (TGA), and transmission electron microscopy (TEM). Catalysis results are examined using 1H NMR and/or GC-MS analyses of isolated reaction mixtures. Full article
(This article belongs to the Special Issue Semi-heterogeneous Metal Nanoparticles for Catalytic Applications)
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