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Nanomaterials
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Surfactant-Free Syntheses of Precious Metal Nanoparticles
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Surfactant-Free Syntheses of Precious Metal Nanoparticles

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Synthesis, Interfaces and Nanostructures".

Deadline for manuscript submissions: closed (30 September 2023) | Viewed by 7080

Special Issue Editor

Dr. Jonathan Quinson

E-Mail Website
Guest Editor
Department of Chemistry, University of Copenhagen, 5 Universitetsparken, 2100 Copenhagen, Denmark
Interests: precious metals; nanoparticles; colloids; sustainability; energy

Special Issue Information

Dear Colleagues,

Despite their widespread use in different synthetic processes, surfactants are actually not needed to develop a range of nanomaterials. These surfactant-free nanomaterials can be obtained as colloidal dispersions or directly formed and/or stabilized on supports. Avoiding the use of surfactants greatly simplifies the syntheses of nanomaterials but also offers various desired features which are relevant for several applications. In particular, precious metal nanoparticles greatly benefit from surfactant-free syntheses, not only because precious metals are model systems in various studies on the formation mechanisms of nanomaterial but also due to their multiple applications.

This Special Issue of Nanomaterials welcomes the submission of manuscripts investigating the synthesis, characterization, and/or applications of so-called surfactant-free precious-metal-based nanomaterials, obtained by chemical or physical methods.

The definition of surfactant-free nanomaterials obtained by wet chemical methods is certainly broad and still subject to interpretation since different wording can be found in the literature (e.g., “capping agents”, “ligands”, “surfactants”, “polymers”, “stabilizers”, and “additives” are commonly used). The focus of this Special Issue is on synthesis moving away from the use of such molecules.

Authors are welcome upon submission of their work to stress how their research relates to the use or understanding of the surfactant-free synthesis of precious metal nanomaterials. We hope that this Special Issue will be a useful platform which will offer an overview of recent progress and remaining challenges in the development of surfactant-free syntheses of precious metal nanomaterials.

Dr. Jonathan Quinson
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 2900 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

  • Precious metals
  • Nanomaterials
  • Surfactant-free
  • Catalysis
  • Synthesis
  • Characterization
  • Application
  • Colloids
  • Supported nanomaterials

Published Papers (3 papers)

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Research

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13 pages, 2719 KiB  
Article
Synthesis, In Vitro Testing, and Biodistribution of Surfactant-Free Radioactive Nanoparticles for Cancer Treatment
by Carla Daruich de Souza, Angelica Bueno Barbezan, Wilmmer Alexander Arcos Rosero, Sofia Nascimento dos Santos, Diego Vergaças de Sousa Carvalho, Carlos Alberto Zeituni, Emerson Soares Bernardes, Daniel Perez Vieira, Patrick Jack Spencer, Martha Simões Ribeiro and Maria Elisa Chuery Martins Rostelato
Nanomaterials 2022, 12(2), 187; https://0-doi-org.brum.beds.ac.uk/10.3390/nano12020187 - 06 Jan 2022
Cited by 1 | Viewed by 1579
Abstract
New forms of cancer treatment, which are effective, have simple manufacturing processes, and easily transportable, are of the utmost necessity. In this work, a methodology for the synthesis of radioactive Gold-198 nanoparticles without the use of surfactants was described. The nuclear activated Gold-198 [...] Read more.
New forms of cancer treatment, which are effective, have simple manufacturing processes, and easily transportable, are of the utmost necessity. In this work, a methodology for the synthesis of radioactive Gold-198 nanoparticles without the use of surfactants was described. The nuclear activated Gold-198 foils were transformed into H198AuCl4 by dissolution using aqua regia, following a set of steps in a specially designed leak-tight setup. Gold-198 nanoparticles were synthesized using a citrate reduction stabilized with PEG. In addition, TEM results for the non-radioactive product presented an average size of 11.0 nm. The DLS and results for the radioactive 198AuNPs presented an average size of 8.7 nm. Moreover, the DLS results for the PEG-198AuNPs presented a 32.6 nm average size. Cell line tests showed no cytotoxic effect in any period and the concentrations were evaluated. Furthermore, in vivo testing showed a high biological uptake in the tumor and a cancer growth arrest. Full article
(This article belongs to the Special Issue Surfactant-Free Syntheses of Precious Metal Nanoparticles)
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10 pages, 3746 KiB  
Communication
Anion Dependent Particle Size Control of Platinum Nanoparticles Synthesized in Ethylene Glycol
by Johanna Schröder, Sarah Neumann, Jonathan Quinson, Matthias Arenz and Sebastian Kunz
Nanomaterials 2021, 11(8), 2092; https://0-doi-org.brum.beds.ac.uk/10.3390/nano11082092 - 18 Aug 2021
Cited by 6 | Viewed by 2837
Abstract
The polyol synthesis is a well-established method to form so-called “surfactant-free” nanoparticles (NPs). In the present study, the NP size resulting from the thermal reduction of the precursors H2PtCl6, H2Pt(OH)6, or Pt(acac)2 in presence [...] Read more.
The polyol synthesis is a well-established method to form so-called “surfactant-free” nanoparticles (NPs). In the present study, the NP size resulting from the thermal reduction of the precursors H2PtCl6, H2Pt(OH)6, or Pt(acac)2 in presence of the bases NaOH or Na(acac) at different concentrations is studied. It is shown that the size control depends more strongly on the nature of the precursor (metal salt) than on the anion present in the base. The latter is surprising as the concentration of the base anion is often an important factor to achieve a size control. The reduction of H2PtCl6 or H2Pt(OH)6 in presence of NaOH and Na(acac) confirm the observation that the NP size is determined by the OH−/Pt molar ratio and expands it to the base anion/Pt molar ratio. In contrast, the reduction of Pt(acac)2 in presence of the bases NaOH (previous reports) or Na(acac) (shown in the present work) leads to larger NPs of ca. 3 nm, independent of the concentration of the base anions. Hence, the anion effect observed here seems to originate predominantly from the nature of the precursor (precursor anion dependence) and only for certain precursors as H2PtCl6 or H2Pt(OH)6 the size control depends on the base anion/Pt molar ratio. Full article
(This article belongs to the Special Issue Surfactant-Free Syntheses of Precious Metal Nanoparticles)
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Review

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26 pages, 5239 KiB  
Review
Metal Nanoclusters Synthesized in Alkaline Ethylene Glycol: Mechanism and Application
by Yuan Wang and Menggeng Hao
Nanomaterials 2023, 13(3), 565; https://0-doi-org.brum.beds.ac.uk/10.3390/nano13030565 - 30 Jan 2023
Cited by 4 | Viewed by 1680
Abstract
The “unprotected” metal and alloy nanoclusters (UMCs) prepared by the alkaline ethylene glycol method, which are stabilized with simple ions and solvent molecules, have the advantages of a small particle size, a narrow size distribution, good stability, highly efficient preparation, easy separation, surface [...] Read more.
The “unprotected” metal and alloy nanoclusters (UMCs) prepared by the alkaline ethylene glycol method, which are stabilized with simple ions and solvent molecules, have the advantages of a small particle size, a narrow size distribution, good stability, highly efficient preparation, easy separation, surface modification and transfer between different phases. They can be composited with diverse materials to prepare catalytic systems with controllable structures, providing an effective means of studying the different factors’ effects on the catalytic properties separately. UMCs have been widely used in the development of high-performance catalysts for a variety of functional systems. This paper will review the research progress on the formation mechanism of the unprotected metal nanoclusters, exploring the structure–function relationship of metal nanocluster catalysts and the preparation of excellent metal catalysts using the unprotected metal nanoclusters as building blocks or starting materials. A principle of the influence of carriers, ligands and modifiers in metal nanocluster catalysts on the catalytic properties is proposed. Full article
(This article belongs to the Special Issue Surfactant-Free Syntheses of Precious Metal Nanoparticles)
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