scholarly journals Noble Metal Nanoparticles Stabilized by Hyper-Cross-Linked Polystyrene as Effective Catalysts in Hydrogenation of Arenes

Molecules ◽  
2021 ◽  
Vol 26 (15) ◽  
pp. 4687
Author(s):  
Elena S. Bakhvalova ◽  
Arina O. Pinyukova ◽  
Alexey V. Mikheev ◽  
Galina N. Demidenko ◽  
Mikhail G. Sulman ◽  
...  
Keyword(s):  
Metal Nanoparticles ◽  
Organic Solvents ◽  
Noble Metal ◽  
Noble Metal Nanoparticles ◽  
Batch Mode ◽  
High Importance ◽  
Ru Nanoparticles ◽  
Wide Range ◽  
Pharmaceutical Industries

This work is addressing the arenes’ hydrogenation—the processes of high importance for petrochemical, chemical and pharmaceutical industries. Noble metal (Pd, Pt, Ru) nanoparticles (NPs) stabilized in hyper-cross-linked polystyrene (HPS) were shown to be active and selective catalysts in hydrogenation of a wide range of arenes (monocyclic, condensed, substituted, etc.) in a batch mode. HPS effectively stabilized metal NPs during hydrogenation in different medium (water, organic solvents) and allowed multiple catalyst reuses.

scholarly journals Noble Metal Nanoparticles-Based Colorimetric Biosensor for Visual Quantification: A Mini Review

Chemosensors ◽  
2019 ◽  
Vol 7 (4) ◽  
pp. 53 ◽  
Author(s):  
Lu Yu ◽  
Na Li
Keyword(s):  
Metal Nanoparticles ◽  
Noble Metal ◽  
Electrostatic Interactions ◽  
Organic Molecules ◽  
Chemical Reduction ◽  
Noble Metal Nanoparticles ◽  
Gold And Silver Nanoparticles ◽  
Local Surface Plasmon Resonance ◽  
Reliable Technique ◽  
Wide Range

Nobel metal can be used to form a category of nanoparticles, termed noble metal nanoparticles (NMNPs), which are inert (resistant to oxidation/corrosion) and have unique physical and optical properties. NMNPs, particularly gold and silver nanoparticles (AuNPs and AgNPs), are highly accurate and sensitive visual biosensors for the analytical detection of a wide range of inorganic and organic compounds. The interaction between noble metal nanoparticles (NMNPs) and inorganic/organic molecules produces colorimetric shifts that enable the accurate and sensitive detection of toxins, heavy metal ions, nucleic acids, lipids, proteins, antibodies, and other molecules. Hydrogen bonding, electrostatic interactions, and steric effects of inorganic/organic molecules with NMNPs surface can react or displacing capping agents, inducing crosslinking and non-crosslinking, broadening, or shifting local surface plasmon resonance absorption. NMNPs-based biosensors have been widely applied to a series of simple, rapid, and low-cost diagnostic products using colorimetric readout or simple visual assessment. In this mini review, we introduce the concepts and properties of NMNPs with chemical reduction synthesis, tunable optical property, and surface modification technique that benefit the development of NMNPs-based colorimetric biosensors, especially for the visual quantification. The “aggregation strategy” based detection principle of NMNPs colorimetric biosensors with the mechanism of crosslinking and non-crosslinking have been discussed, particularly, the critical coagulation concentration-based salt titration methodology have been exhibited by derived equations to explain non-crosslinking strategy be applied to NMNPs based visual quantification. Among the broad categories of NMNPs based biosensor detection analyses, we typically focused on four types of molecules (melamine, single/double strand DNA, mercury ions, and proteins) with discussion from the standpoint of the interaction between NMNPs surface with molecules, and DNA engineered NMNPs-based biosensor applications. Taken together, NMNPs-based colorimetric biosensors have the potential to serve as a simple yet reliable technique to enable visual quantification.

Electrochemical Sensors Based on Noble Metal Nanoparticles in Voltammetry

2021 ◽  
Vol 887 ◽  
pp. 54-59
Author(s):  
D.O. Perevezentseva ◽  
Eduard V. Gorchakov
Keyword(s):  
Metal Nanoparticles ◽  
Noble Metal ◽  
Electrochemical Sensors ◽  
Narrow Range ◽  
Spherical Shape ◽  
High Sensitivity ◽  
Noble Metal Nanoparticles ◽  
Wide Range ◽  
Sulfur Containing

Portable electrochemical sensors based on noble metal nanoparticles (МеNPs) for the quantitative determination of hydrogen peroxide (H2O2) and sulfur-containing amino acids (cysteine, methionine, glutathione) are discussed. These sensors have high sensitivity (pM), with low sample requirements (<50 μl). This article discusses methods for producing sensors based on silver and gold nanoparticles and their application in voltammetry. It is shown that the sensitivity of H2O2 determination on a sensor based on silver nanoparticles (AgNPs) depends on their size. Their size is determined by the reducing agent. Sensors based on AgNPs of spherical shape with the smallest size from 0.5 to 17.5 nm have the highest sensitivity for determining H2O2, but a narrow range of determined concentrations. Sensors on medium-sized AgNPs have optimal metrological characteristics. Their size is from 10 to 55 nm, less sensitive, but with a wide range of determined concentrations from 0.1 to 1 nm H2O2. The linearity of the range of glutathione concentrations is 1.0-10.0 pM. The linearity of the range of determined concentrations of methionine is 1–26 рМ.

Phase Transfer of Noble Metal Nanoparticles to Organic Solvents

Langmuir ◽  
2014 ◽  
Vol 30 (8) ◽  
pp. 1932-1938 ◽  
Author(s):  
Marco Lista ◽  
Dylan Zhe Liu ◽  
Paul Mulvaney
Keyword(s):  
Metal Nanoparticles ◽  
Organic Solvents ◽  
Noble Metal ◽  
Phase Transfer ◽  
Noble Metal Nanoparticles

Role of organic functionalities linked to alkoxysilane precursors in nanomaterials synthesis and their biomedical applications

2015 ◽  
Vol 1719 ◽  
Author(s):  
P. C. Pandey ◽  
Govind Pandey
Keyword(s):  
Salt Tolerance ◽  
Metal Ions ◽  
Metal Nanoparticles ◽  
Noble Metal ◽  
Biomedical Applications ◽  
Ph Sensitivity ◽  
Noble Metal Nanoparticles ◽  
Biological Interactions ◽  
Wide Range

ABSTRACTThe synthesis of biocompatible noble metal nanoparticles dispersible in a wide range of biological media with control of polycrystalinity and nanogeometry, pH sensitivity and salt tolerance has been a challenging requirements. The role of 3-aminopropyltrimethoxysilane (3-APTMS) and organic reducing reagents for real time synthesis of amphilic noble metal nanoparticles meeting these requirements are demonstrated justifying the following; (1) 3-APTMS capped noble metal ions are converted into respective metal nanoparticles in the presence of one of organic reducing agents i.e., cyclohexanone, tetrahydrofuran hydroperoxide (THF-HPO), formaldehyde, acetaldehyde, acetone, t-buty dimethyl keotone, 3-Glycidoxy-propyltrimethoxysilane (3-GPTMS); (2) 3-APTMS acts as micelle, promotes the interaction of metal ions with organic reducing agent, precisely controls the size of metal nanoparticles, pH sensititvity and salt tolerance and also provides a suitable medium for nanoparticles suspension, (3) the use of suitable organic reagent precisely controls the polarity of as made noble metal nanoparticles allowing specific biological interactions, and (4) 3-APTMS significantly increases the stability and controls the pH sensitivity and salt tolerance of metal nanoparticles. The as synthesized nanomaterials show potential viability in biomedical applications from many angles i.e. (a) as potential bioelectrocatalyst, (b) selective interaction with active proteins and cellular components, and (c) peroxidase mimetic.

An insight into the binding behavior of graphene oxide and noble metal nanoparticles

2021 ◽  
Vol 129 (12) ◽  
pp. 125302
Author(s):  
Wajeeha Saeed ◽  
Zeeshan Abbasi ◽  
Shumaila Majeed ◽  
Sohail Anjum Shahzad ◽  
Abdul Faheem Khan ◽  
...  
Keyword(s):  
Graphene Oxide ◽  
Metal Nanoparticles ◽  
Noble Metal ◽  
Noble Metal Nanoparticles ◽  
Binding Behavior ◽  
Insight Into

scholarly journals Exterior and Internal Uniform Loading of Pt Nanoparticles on Yolk-Shell La2O3 by Acoustic Levitation Synthesis with Enhanced Photocatalytic Performance

Materials ◽  
2019 ◽  
Vol 13 (1) ◽  
pp. 107 ◽  
Author(s):  
Ming Qin ◽  
Qing Chang ◽  
Yinkai Yu ◽  
Hongjing Wu
Keyword(s):  
Metal Oxide ◽  
Metal Nanoparticles ◽  
Noble Metal ◽  
Shell Structure ◽  
Photocatalytic Performance ◽  
Chemical Interaction ◽  
Pt Nanoparticles ◽  
Noble Metal Nanoparticles ◽  
Homogeneous Distribution ◽  
Acoustic Levitation

By the deposition of noble metal nanoparticles on a metal oxide substrate with a specific micro-/nanostructure, namely, yolk-shell structure, a remarkable improvement in photocatalytic performance can be achieved by the composites. Nevertheless, noble metal nanoparticles only distribute on the surface shell of metal oxide substrates when the conventional wet-chemistry reduction approach is employed. Herein, we proposed a novel acoustic levitation synthesis of Pt nanoparticles deposited on yolk-shell La2O3. The composites not only displayed well-defined, homogeneous distribution of Pt NPs on the exterior shell of La2O3 and the interior La2O3 core, but an enhanced chemical interaction between Pt and La2O3. The unique structure not only can display improved photocatalytic degradation rate toward methyl orange, but also may show great potential in fields of hydrogen generation, environmental protection, etc. The novel acoustic levitation synthesis can supplement the methodology of synthesizing well dispersed noble metal oxides over the whole yolk-shell structure through noble metal NPs deposition method.

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