The impacts of nanotechnology on catalysis by precious metal nanoparticles

Jin, Rongchao

doi:10.1515/ntrev-2011-0003

Cited by 139 publications

(44 citation statements)

References 161 publications

(196 reference statements)

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“…Among the metals of the periodic table, the precious as Ir is one of the most catalytically active [104]. Their activity is hugely enhanced at the nano level [105][106][107]. This metal, as well as its metal oxides, exhibits a high catalytic activity [104,106].…”

Section: Iridiummentioning

confidence: 99%

Solid-State Preparation of Metal and Metal Oxides Nanostructures and Their Application in Environmental Remediation

Dı́az

Valenzuela

Laguna‐Bercero

2022

IJMS

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Nanomaterials have attracted much attention over the last decades due to their very different properties compared to those of bulk equivalents, such as a large surface-to-volume ratio, the size-dependent optical, physical, and magnetic properties. A number of solution fabrication methods have been developed for the synthesis of metal and metal oxides nanoparticles, but few solid-state methods have been reported. The application of nanostructured materials to electronic solid-state devices or to high-temperature technology requires, however, adequate solid-state methods for obtaining nanostructured materials. In this review, we discuss some of the main current methods of obtaining nanomaterials in solid state, and also we summarize the obtaining of nanomaterials using a new general method in solid state. This new solid-state method to prepare metals and metallic oxides nanostructures start with the preparation of the macromolecular complexes chitosan·Xn and PS-co-4-PVP·MXn as precursors (X = anion accompanying the cationic metal, n = is the subscript, which indicates the number of anions in the formula of the metal salt and PS-co-4-PVP = poly(styrene-co-4-vinylpyridine)). Then, the solid-state pyrolysis under air and at 800 °C affords nanoparticles of M°, MxOy depending on the nature of the metal. Metallic nanoparticles are obtained for noble metals such as Au, while the respective metal oxide is obtained for transition, representative, and lanthanide metals. Size and morphology depend on the nature of the polymer as well as on the spacing of the metals within the polymeric chain. Noticeably in the case of TiO2, anatase or rutile phases can be tuned by the nature of the Ti salts coordinated in the macromolecular polymer. A mechanism for the formation of nanoparticles is outlined on the basis of TG/DSC data. Some applications such as photocatalytic degradation of methylene by different metal oxides obtained by the presented solid-state method are also described. A brief review of the main solid-state methods to prepare nanoparticles is also outlined in the introduction. Some challenges to further development of these materials and methods are finally discussed.

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Section: Iridiummentioning

confidence: 99%

Solid-State Preparation of Metal and Metal Oxides Nanostructures and Their Application in Environmental Remediation

Dı́az

Valenzuela

Laguna‐Bercero

2022

IJMS

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“…Compared to the bulk material, NPs have unique physicochemical properties due to their high surface area to volume ratio. Reduced cohesive energy (especially the surface atoms at sharp corners and edges become very reactive) and a higher degree of curvature provide excellent properties to NPs to act as a catalyst for surface-sensitive reactions [ 32 ]. At the nanoscale, uneven distribution of electrons leads to magnetic properties in NPs [ 33 ].…”

Section: What Are Nanoparticles (Nps)?mentioning

confidence: 99%

Marine Macroalgae Display Bioreductant Efficacy for Fabricating Metallic Nanoparticles: Intra/Extracellular Mechanism and Potential Biomedical Applications

Ansari

Saquib

Matteis

et al. 2021

Bioinorganic Chemistry and Applications

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The application of hazardous chemicals during nanoparticle (NP) synthesis has raised alarming concerns pertaining to their biocompatibility and equally to the environmental harmlessness. In the recent decade, nanotechnological research has made a gigantic shift in order to include the natural resources to produce biogenic NPs. Within this approach, researchers have utilized marine resources such as macroalgae and microalgae, land plants, bacteria, fungi, yeast, actinomycetes, and viruses to synthesize NPs. Marine macroalgae (brown, red, and green) are rich in polysaccharides including alginates, fucose-containing sulfated polysaccharides (FCSPs), galactans, agars or carrageenans, semicrystalline cellulose, ulvans, and hemicelluloses. Phytochemicals are abundant in phenols, tannins, alkaloids, terpenoids, and vitamins. However, microorganisms have an abundance of active compounds ranging from sugar molecules, enzymes, canonical membrane proteins, reductase enzymes (NADH and NADPH), membrane proteins to many more. The prime reason for using the aforesaid entities in the metallic NPs synthesis is based on their intrinsic properties to act as bioreductants, having the capability to reduce and cap the metal ions into stabilized NPs. Several green NPs have been verified for their biocompatibility in human cells. Bioactive constituents from the above resources have been found on the green metallic NPs, which has demonstrated their efficacies as prospective antibiotics and anti-cancer agents against a range of human pathogens and cancer cells. Moreover, these NPs can be characterized for the size, shapes, functional groups, surface properties, porosity, hydrodynamic stability, and surface charge using different characterization techniques. The novelty and originality of this review is that we provide recent research compilations on green synthesis of NPs by marine macroalgae and other biological sources (plant, bacteria, fungi, actinomycetes, yeast, and virus). Besides, we elaborated on the detailed intra- and extracellular mechanisms of NPs synthesis by marine macroalgae. The application of green NPs as anti-bacterial, anti-cancer, and popular methods of NPs characterization techniques has also been critically reviewed.

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“…Nanotechnology has in the recent years greatly increased our ability to control and study matter on the length-scales between 1 and few hundreds nanometers. This increased control of materials has been important for fabrication of electronic circuits with smaller component size [1], in production of advanced catalysts nanomaterials [2,3] and for nano-particle use in photovoltaics [4,5]. These development in nanofabrication have been supported by advances in characterisation techniques allowing for wider areas of application.…”

Section: Introductionmentioning

confidence: 99%

Electron Beam Lithography Fabrication of SU-8 Polymer Structures for Cell Studies

Vinje

Beckwith

Sikorski

2020

J. Microelectromech. Syst.

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Flat surfaces decorated with micro-and nanostructures are important tools in biomedical research used to control cellular shape, in studies of mechanotransduction, membrane mechanics, cell migration and cellular interactions with nanostructured surfaces. Existing methods to fabricate surface-bound nanostructures are typically limited either by resolution, aspect ratio or throughput. In this work, we explore electron beam lithography based structuring of the epoxy resist SU-8 on glass substrate. We focus on a systematic investigation of the process parameters and determine limits of the fabrication process, both in terms of spatial resolution, structure aspect ratio and fabrication throughput. The described approach is capable of producing high-aspect ratio, surface bound nanostructures with height ranging from 100 nm to 4000 nm and with in-plane resolution below 100 nm directly on a transparent substrate. Fabricated nanostructured surfaces can be integrated with common techniques for biomedical research, such as high numerical aperture optical microscopy. Furthermore, we show how the described approach can be used to make nanostructures with multiple heights on the same surface, something which is not readily achievable using alternative fabrication approaches. Our research paves an alternative way of manufacturing nanostructured surfaces with applications in life science research.

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The impacts of nanotechnology on catalysis by precious metal nanoparticles

Cited by 139 publications

References 161 publications

Solid-State Preparation of Metal and Metal Oxides Nanostructures and Their Application in Environmental Remediation

Solid-State Preparation of Metal and Metal Oxides Nanostructures and Their Application in Environmental Remediation

Marine Macroalgae Display Bioreductant Efficacy for Fabricating Metallic Nanoparticles: Intra/Extracellular Mechanism and Potential Biomedical Applications

Electron Beam Lithography Fabrication of SU-8 Polymer Structures for Cell Studies

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