scholarly journals Symmetry Breaking by Surface Blocking: Synthesis of Bimorphic Silver Nanoparticles, Nanoscale Fishes and Apples

2016 ◽  
Vol 6 (1) ◽  
Author(s):  
Nicole Cathcart ◽  
Vladimir Kitaev
Keyword(s):  
Silver Nanoparticles ◽  
Acrylic Acid ◽  
Symmetry Breaking ◽  
Metal Nanoparticle ◽  
Shape Design ◽  
Seeded Growth ◽  
Nanoparticle Growth ◽  
Powerful Approach ◽  
Advanced Applications ◽  
Nucleation Point

Abstract A powerful approach to augment the diversity of well-defined metal nanoparticle (MNP) morphologies, essential for MNP advanced applications, is symmetry breaking combined with seeded growth. Utilizing this approach enabled the formation of bimorphic silver nanoparticles (bi-AgNPs) consisting of two shapes linked by one regrowth point. Bi-AgNPs were formed by using an adsorbing polymer, poly(acrylic acid), PAA, to block the surface of a decahedral AgNP seed and restricting growth of new silver to a single nucleation point. First, we have realized 2-D growth of platelets attached to decahedra producing nanoscale shapes reminiscent of apples, fishes, mushrooms and kites. 1-D bimorphic growth of rods (with chloride) and 3-D bimorphic growth of cubes and bipyramids (with bromide) were achieved by using halides to induce preferential (100) stabilization over (111) of platelets. Furthermore, the universality of the formation of bimorphic nanoparticles was demonstrated by using different seeds. Bi-AgNPs exhibit strong SERS enhancement due to regular cavities at the necks. Overall, the reported approach to symmetry breaking and bimorphic nanoparticle growth offers a powerful methodology for nanoscale shape design.

scholarly journals Effect of acrylic acid feed contents of microgels on catalytic activity of silver nanoparticles fabricated hybrid microgels

2015 ◽  
Vol 39 ◽  
pp. 96-107 ◽  
Author(s):  
Zahoor H. FAROOQI ◽  
Shanza Rauf KHAN ◽  
Robina BEGUM ◽  
Farah KANWAL ◽  
Ahsan SHARIF ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Catalytic Activity ◽  
Acrylic Acid ◽  
Hybrid Microgels

scholarly journals Enhanced inhibition of influenza virus infection by peptide–noble-metal nanoparticle conjugates

2019 ◽  
Vol 10 ◽  
pp. 1038-1047 ◽  
Author(s):  
Zaid K Alghrair ◽  
David G Fernig ◽  
Bahram Ebrahimi
Keyword(s):  
Silver Nanoparticles ◽  
Influenza Virus ◽  
Antiviral Activity ◽  
Noble Metal ◽  
Metal Nanoparticle ◽  
Model Systems ◽  
Health Concern ◽  
Virus Infectivity ◽  
Mixed Matrix ◽  
Gold And Silver Nanoparticles

The influenza (“flu”) type-A virus is a major medical and veterinary health concern and causes global pandemics. The peptide “FluPep” is an established inhibitor of influenza virus infectivity in model systems. We have explored the potential for noble-metal nanoparticle conjugates of FluPep to enhance its antiviral activity and to determine their potential as a delivery platform for FluPep. FluPep ligand is FluPep extended at its N-terminus with the sequence CVVVTAAA, to allow for its incorporation into a mixed-matrix ligand shell of a peptidol and an alkanethiol ethylene glycol consisting of 70% CVVVTol and 30% HS(CH2)11(OC2H4)4OH (mol/mol). Gold and silver nanoparticles (ca. 10 nm diameter) with up to 5% (mol/mol) FluPep ligand remained as stable as the control of mixed-matrix-passivated nanoparticles in a variety of tests, including ligand exchange with dithiothreitol. The free FluPep ligand peptide was found to inhibit viral plaque formation in canine MDCK cells (IC50 = 2.1 nM), but was less potent than FluPep itself (IC50 = 140 pM). Nanoparticles functionalised with FluPep ligand showed enhanced antiviral activity compared to the free peptides. The IC50 value of the FluPep-functionalised nanoparticles decreased as the grafting density of FluPep ligand increased from 0.03% to 5% (both mol/mol), with IC50 values down to about 10% of that of the corresponding free peptide. The data demonstrate that conjugation of FluPep to gold and silver nanoparticles enhances its antiviral potency; the antimicrobial activity of silver ions may enable the design of even more potent antimicrobial inhibitors, capable of targeting both influenza and bacterial co-infections.

scholarly journals Process Optimization for Green Synthesis of Silver Nanoparticles Using Indonesian Medicinal Plant Extracts

Processes ◽  
2020 ◽  
Vol 8 (8) ◽  
pp. 998
Author(s):  
Kartini Kartini ◽  
Amarisa Alviani ◽  
Dia Anjarwati ◽  
Adinda Finna Fanany ◽  
Johan Sukweenadhi ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Medicinal Plant ◽  
Green Synthesis ◽  
Plant Extracts ◽  
Curcuma Longa ◽  
Scale Up ◽  
Pharmaceutical Products ◽  
Metal Nanoparticle ◽  
Phyllanthus Niruri ◽  
Medicinal Plant Extracts

Silver nanoparticles (AgNPs) are an interesting metal nanoparticle that can be incorporated into pharmaceutical products, including for diabetic foot ulcers as an antimicrobial agent. Green synthesis of AgNPs using plant extracts has been drawing much attention as it is simple, eco-friendly, stable, and cost-effective. This present study was performed to evaluate the potential of three Indonesian medicinal plant extracts, namely Phyllanthus niruri (PN), Orthosiphon stamineus (OS), and Curcuma longa (CL), as reducing and capping agents in the green synthesis of AgNPs, and to optimize their concentrations. Based on the yields and characteristics of the formed nanoparticles, which were analyzed using a UV-Vis spectrophotometer, particle size analyzer, scanning electron microscope, and X-ray diffractometer, Phyllanthus niruri extract at a concentration of 0.5% was concluded as the best extract in the green synthesis of AgNPs. It is thereby a prospective reducing and capping agent for further scale-up studies.

Surface functionalisation of polypropylene hernia-repair meshes by RF-activated plasma polymerisation of acrylic acid and silver nanoparticles

2015 ◽  
Vol 328 ◽  
pp. 287-295 ◽  
Author(s):  
Roberto Nisticò ◽  
Andrea Rosellini ◽  
Paola Rivolo ◽  
Maria Giulia Faga ◽  
Roberta Lamberti ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Acrylic Acid ◽  
Hernia Repair ◽  
Surface Functionalisation ◽  
Plasma Polymerisation

XANES and EXAFS studies on metal nanoparticle growth and bimetallic interaction of Ni-based catalysts for CO2 reforming of CH4

2013 ◽  
Vol 207 ◽  
pp. 3-12 ◽  
Author(s):  
Hui Wang ◽  
Jeffrey T. Miller ◽  
Mohsen Shakouri ◽  
Chunyu Xi ◽  
Tianpin Wu ◽  
...  
Keyword(s):  
Metal Nanoparticle ◽  
Co2 Reforming ◽  
Nanoparticle Growth ◽  
Co2 Reforming Of Ch4
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