Surface selective binding of 2,5-dimercapto-1,3,4-thiadiazole (DMTD) on silver and gold nanoparticles: a Raman and DFT study

RSC Advances ◽  
2016 ◽  
Vol 6 (67) ◽  
pp. 62529-62539 ◽  
Author(s):  
Nandita Maiti ◽  
Ridhima Chadha ◽  
Abhishek Das ◽  
Sudhir Kapoor
Keyword(s):  
Gold Nanoparticles ◽  
Au Nanoparticles ◽  
Dft Study ◽  
Dft Studies ◽  
Selective Binding ◽  
Silver And Gold Nanoparticles ◽  
Preferential Binding

SERS and DFT studies indicated preferential binding of DMTD towards Ag and Au nanoparticles through ring N and thiocarbonyl S atoms.

Surface plasmon resonance of silver and gold nanoparticles in the proximity of graphene studied using the discrete dipole approximation method

2016 ◽  
Vol 18 (3) ◽  
pp. 2230-2241 ◽  
Author(s):  
Vincenzo Amendola
Keyword(s):  
Gold Nanoparticles ◽  
Surface Plasmon Resonance ◽  
Surface Plasmon ◽  
Approximation Method ◽  
Plasmon Resonance ◽  
Au Nanoparticles ◽  
Dipole Approximation ◽  
Discrete Dipole Approximation ◽  
Silver And Gold Nanoparticles ◽  
Graphene Flakes

Surface plasmon resonance (SPR) of Ag and Au nanoparticles (spheres, rods, discs) is damped when they are located at less than 5 nm from graphene flakes or embedded in a graphene matrix.

Antibacterial and Anti-Biofilm Biosynthesised Silver and Gold Nanoparticles for Medical Applications: Mechanism of Action, Toxicity and Current Status

2020 ◽  
Vol 17 (2) ◽  
pp. 88-100 ◽  
Author(s):  
Sundos Suleman Ismail Abdalla ◽  
Haliza Katas ◽  
Fazren Azmi ◽  
Mohd Fauzi Mh Busra
Keyword(s):  
Gold Nanoparticles ◽  
Synthesis Method ◽  
Chemical Characterization ◽  
Current Status ◽  
Silver And Gold Nanoparticles ◽  
Physical And Chemical Characterization ◽  
Biosynthesized Agnps ◽  
Physical And Chemical ◽  
Insight Into ◽  
Bio Synthesis

Fast progress in nanoscience and nanotechnology has contributed to the way in which people diagnose, combat, and overcome various diseases differently from the conventional methods. Metal nanoparticles, mainly silver and gold nanoparticles (AgNPs and AuNPs, respectively), are currently developed for many applications in the medical and pharmaceutical area including as antibacterial, antibiofilm as well as anti-leshmanial agents, drug delivery systems, diagnostics tools, as well as being included in personal care products and cosmetics. In this review, the preparation of AgNPs and AuNPs using different methods is discussed, particularly the green or bio- synthesis method as well as common methods used for their physical and chemical characterization. In addition, the mechanisms of the antimicrobial and anti-biofilm activity of AgNPs and AuNPs are discussed, along with the toxicity of both nanoparticles. The review will provide insight into the potential of biosynthesized AgNPs and AuNPs as antimicrobial nanomaterial agents for future use.

Stabilization of Silver and Gold Nanoparticles: Preservation and Improvement of Plasmonic Functionalities

2018 ◽  
Vol 119 (1) ◽  
pp. 664-699 ◽  
Author(s):  
Hyunho Kang ◽  
Joseph T. Buchman ◽  
Rebeca S. Rodriguez ◽  
Hattie L. Ring ◽  
Jiayi He ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Silver And Gold Nanoparticles

Interaction of Differently Sized, Shaped, and Functionalized Silver and Gold Nanoparticles with Glycosylated versus Nonglycosylated Transferrin

2021 ◽  
Author(s):  
Rinea Barbir ◽  
Rafael Ramírez Jiménez ◽  
Rafael Martín-Rapún ◽  
Vida Strasser ◽  
Darija Domazet Jurašin ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Silver And Gold Nanoparticles

scholarly journals Green Silver and Gold Nanoparticles: Biological Synthesis Approaches and Potentials for Biomedical Applications

Molecules ◽  
2021 ◽  
Vol 26 (4) ◽  
pp. 844 ◽  
Author(s):  
Andrea Rónavári ◽  
Nóra Igaz ◽  
Dóra I. Adamecz ◽  
Bettina Szerencsés ◽  
Csaba Molnar ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Biomedical Applications ◽  
Biological Activities ◽  
Large Body ◽  
Chemical Properties ◽  
Biological Synthesis ◽  
Silver And Gold Nanoparticles ◽  
Comprehensive Collection ◽  
Synthetic Approaches ◽  
Physical And Chemical

The nanomaterial industry generates gigantic quantities of metal-based nanomaterials for various technological and biomedical applications; however, concomitantly, it places a massive burden on the environment by utilizing toxic chemicals for the production process and leaving hazardous waste materials behind. Moreover, the employed, often unpleasant chemicals can affect the biocompatibility of the generated particles and severely restrict their application possibilities. On these grounds, green synthetic approaches have emerged, offering eco-friendly, sustainable, nature-derived alternative production methods, thus attenuating the ecological footprint of the nanomaterial industry. In the last decade, a plethora of biological materials has been tested to probe their suitability for nanomaterial synthesis. Although most of these approaches were successful, a large body of evidence indicates that the green material or entity used for the production would substantially define the physical and chemical properties and as a consequence, the biological activities of the obtained nanomaterials. The present review provides a comprehensive collection of the most recent green methodologies, surveys the major nanoparticle characterization techniques and screens the effects triggered by the obtained nanomaterials in various living systems to give an impression on the biomedical potential of green synthesized silver and gold nanoparticles.

The Stabilization of Supported Au Nanoparticles in a Highly Sintering Environment using High Surface Free Energy Pt and Ru Cores

2021 ◽  
Author(s):  
Kerry O-Connell ◽  
John R Monnier ◽  
John Regalbuto
Keyword(s):  
Gold Nanoparticles ◽  
Free Energy ◽  
Surface Free Energy ◽  
Au Nanoparticles ◽  
High Surface ◽  
Chemical Environment ◽  
Core Shell

In an effort to stabilize gold nanoparticles which sinter rapidly in a highly corrosive chemical environment, the hydrochlorination of acetylene, bimetallic Ru@Au and Pt@Au core-shell catalysts were prepared by anchoring...

scholarly journals Size and Shape-Dependent Antimicrobial Activities of Silver and Gold Nanoparticles: A Model Study as Potential Fungicides

Molecules ◽  
2020 ◽  
Vol 25 (11) ◽  
pp. 2682 ◽  
Author(s):  
Francis J. Osonga ◽  
Ali Akgul ◽  
Idris Yazgan ◽  
Ayfer Akgul ◽  
Gaddi B. Eshun ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Pathogenic Fungi ◽  
Antimicrobial Activities ◽  
Plant Diseases ◽  
Production Plant ◽  
Silver And Gold Nanoparticles ◽  
Size And Shape ◽  
Model Study ◽  
Pathogenic Microbes ◽  
Bacteria And Fungi

Plant-based pathogenic microbes hinder the yield and quality of food production. Plant diseases have caused an increase in food costs due to crop destruction. There is a need to develop novel methods that can target and mitigate pathogenic microbes. This study focuses on investigating the effects of luteolin tetraphosphate derived silver nanoparticles (LTP-AgNPs) and gold nanoparticles (LTP-AuNPs) as a therapeutic agent on the growth and expression of plant-based bacteria and fungi. In this study, the silver and gold nanoparticles were synthesized at room temperature using luteolin tetraphosphate (LTP) as the reducing and capping agents. The synthesis of LTP-AgNPs and LTP-AuNP was characterized by Transmission Electron Microscopy (TEM) and size distribution. The TEM images of both LTP-AgNPs and LTP-AuNPs showed different sizes and shapes (spherical, quasi-spherical, and cuboidal). The antimicrobial test was conducted using fungi: Aspergillus nidulans, Trichaptum biforme, Penicillium italicum, Fusarium oxysporum, and Colletotrichum gloeosporioides, while the class of bacteria employed include Pseudomonas aeruginosa, Aeromonas hydrophila, Escherichia coli, and Citrobacter freundii as Gram (−) bacteria, and Listeria monocytogenes and Staphylococcus epidermidis as Gram (+) bacterium. The antifungal study demonstrated the selective size and shape-dependent capabilities in which smaller sized spherical (9 nm) and quasi-spherical (21 nm) AgNPs exhibited 100% inhibition of the tested fungi and bacteria. The LTP-AgNPs exhibited a higher antimicrobial activity than LTP-AuNPs. We have demonstrated that smaller sized AgNPs showed excellent inhibition of A. nidulans growth compared to the larger size nanoparticles. These results suggest that LTP-AuNP and LTP-AgNPs could be used to address the detection and remediation of pathogenic fungi, respectively.

Experimental observation of stimulated low-frequency Raman scattering in water suspensions of silver and gold nanoparticles

2013 ◽  
Vol 38 (6) ◽  
pp. 824 ◽  
Author(s):  
N. V. Tcherniega ◽  
K. I. Zemskov ◽  
V. V. Savranskii ◽  
A. D. Kudryavtseva ◽  
A. Y. Olenin ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Raman Scattering ◽  
Experimental Observation ◽  
Low Frequency ◽  
Silver And Gold Nanoparticles ◽  
Water Suspensions
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