The high thermal stabilizing capability of noble metals (Pd and Au) supported by SBA-15 and the impact on CO oxidation

2021 ◽  
Author(s):  
Palle Ramana Murthy ◽  
Jing-Cai Zhang ◽  
Wei-Zhen Li
Keyword(s):  
Co Oxidation ◽  
Metal Nanoparticles ◽  
Precious Metal ◽  
Noble Metals ◽  
The Impact

Precious metal nanoparticles (NPs) are attractive for use in the field of catalysis because of their precisely controlled sizes and shapes.

Review on Methodologies Used in the Synthesis of Metal Nanoparticles: Significance of Phytosynthesis Using Plant Extract as an Emerging Tool

2020 ◽  
Vol 26 (40) ◽  
pp. 5188-5204
Author(s):  
Uzair Nagra ◽  
Maryam Shabbir ◽  
Muhammad Zaman ◽  
Asif Mahmood ◽  
Kashif Barkat
Keyword(s):  
Green Synthesis ◽  
Metal Nanoparticles ◽  
Plant Extracts ◽  
Biomedical Applications ◽  
Noble Metals ◽  
Cost Effective ◽  
Green Technology ◽  
Critical Parameters ◽  
Nanosized Particles ◽  
Preparation Methods

Nanosized particles, with a size of less than 100 nm, have a wide variety of applications in various fields of nanotechnology and biotechnology, especially in the pharmaceutical industry. Metal nanoparticles [MNPs] have been synthesized by different chemical and physical procedures. Still, the biological approach or green synthesis [phytosynthesis] is considered as a preferred method due to eco-friendliness, nontoxicity, and cost-effective production. Various plants and plant extracts have been used for the green synthesis of MNPs, including biofabrication of noble metals, metal oxides, and bimetallic combinations. Biomolecules and metabolites present in plant extracts cause the reduction of metal ions into nanosized particles by one-step preparation methods. MNPs have remarkable attractiveness in biomedical applications for their use as potential antioxidant, anticancer and antibacterial agents. The present review offers a comprehensive aspect of MNPs production via top-to-bottom and bottom-to-top approach with considerable emphasis on green technology and their possible biomedical applications. The critical parameters governing the MNPs formation by plant-based synthesis are also highlighted in this review.

Copper foam in situ loaded with precious metal nanoparticles as transmission SEIRAS substrate for rapid detection of dithiocarbamate pesticides

2020 ◽  
Vol 12 (28) ◽  
pp. 3600-3607
Author(s):  
Xincheng Jiang ◽  
Wen Liu ◽  
Bin Luo ◽  
Xuke Liu ◽  
Yuting Huang ◽  
...  
Keyword(s):  
Metal Nanoparticles ◽  
Rapid Detection ◽  
Precious Metal ◽  
Copper Foam

Copper foam in situ loaded with precious metal nanoparticles as transmission SEIRAS substrate.

scholarly journals Comparative biological effects of spherical noble metal nanoparticles (Rh, Pd, Ag, Pt, Au) with 4–8 nm diameter

2018 ◽  
Vol 9 ◽  
pp. 2763-2774 ◽  
Author(s):  
Alexander Rostek ◽  
Marina Breisch ◽  
Kevin Pappert ◽  
Kateryna Loza ◽  
Marc Heggen ◽  
...  
Keyword(s):  
Metal Nanoparticles ◽  
Noble Metal ◽  
Noble Metals ◽  
Biological Effects ◽  
Human Mesenchymal Stem Cells ◽  
Average Diameter ◽  
Vinyl Pyrrolidone ◽  
Noble Metal Nanoparticles ◽  
Spherical Average ◽  
Size And Morphology

For a comparative cytotoxicity study, nanoparticles of the noble metals Rh, Pd, Ag, Pt, and Au (spherical, average diameter 4 to 8 nm) were prepared by reduction in water and colloidally stabilized with poly(N-vinyl pyrrolidone) (PVP). Thus, their shape, size, and surface functionalization were all the same. Size and morphology of the nanoparticles were determined by dynamic light scattering (DLS), analytical disc centrifugation (differential centrifugal sedimentation, DCS), and high-resolution transmission electron microscopy (HRTEM). Cell-biological experiments were performed to determine the effect of particle exposure on the viability of human mesenchymal stem cells (hMSCs). Except for silver, no adverse effect of any of the metal nanoparticles was observed for concentrations up to 50 ppm (50 mg L−1) incubated for 24 h, indicating that noble metal nanoparticles (rhodium, palladium, platinum, gold) that do not release ions are not cytotoxic under these conditions.

scholarly journals Structural changes in noble metal nanoparticles during CO oxidation and their impact on catalyst activity

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
See Wee Chee ◽  
Juan Manuel Arce-Ramos ◽  
Wenqing Li ◽  
Alexander Genest ◽  
Utkur Mirsaidov
Keyword(s):  
Co Oxidation ◽  
Metal Nanoparticles ◽  
Noble Metal ◽  
Structural Changes ◽  
Catalyst Activity ◽  
Noble Metal Nanoparticles

scholarly journals ARTISTIC METAL PROCESSING IN THE MOLDOVAN SSR AND THE REPUBLIC OF MOLDOVA: FORGOTTEN OR LESS KNOWN NAMES

Akademos ◽  
2021 ◽  
Vol 60 (1) ◽  
pp. 146-152
Author(s):  
Liliana Condraticova ◽  
Keyword(s):  
Noble Metals ◽  
Relevant Information ◽  
Folk Tales ◽  
Republic Of Moldova ◽  
Decorative Art ◽  
Metal Plates ◽  
Archival Documents ◽  
Metal Processing ◽  
The Republic ◽  
The Impact

The main purpose of our approach is to analyze the activity of craftsmen (artisans) in the field of artistic metal processing in the second half of the twentieth century – the beginning of the twenty-first century. The work of the artists includes various decorative boards representing village life, heroes of folk tales and agricultural work, emphasizing the impact of folk art on the subjects approached by decorative craftsmen. Jewelry, being a relatively apolitical field, is represented by necklaces with pendants, earrings, brooches, rings, all made of noble metals and fine, ornamental pebbles. Based on archival documents, exhibition catalogs and interviews with artists who used to make jewelry and various metal plates, was presented relevant information regarding the activity of craftsmen whose names were recently revealed (Alexei Marco, Gheorghe Cojusnean, Vladimir Calasnicov, Vladimir Vasilkov etc.). Also, in the scientific circuit were introduced new, forgotten or less known names: Vasili Sochin, Iuri Terehov, Natalia Vavilina and others. The evocation of their creation comes to complete the general picture of the evolution of decorative art, implicitly of the artistic processing of metals from the Moldovan SSR and the Republic of Moldova.

Nanoparticles in a box: a concept to isolate, store and re-use colloidal surfactant-free precious metal nanoparticles

2017 ◽  
Vol 5 (13) ◽  
pp. 6140-6145 ◽  
Author(s):  
Sarah Neumann ◽  
Sarah Grotheer ◽  
Julia Tielke ◽  
Imke Schrader ◽  
Jonathan Quinson ◽  
...  
Keyword(s):  
Metal Nanoparticles ◽  
Precious Metal ◽  
Heterogeneous Catalytic ◽  
Heterogeneous Catalytic Processes ◽  
Unique Approach ◽  
Catalytic Processes

A unique approach is presented to isolate surfactant-free nanoparticles as solid powders and their subsequent use for heterogeneous catalytic processes without loss of performance.

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