Journal ArticleDOI
Green synthesis of highly stabilized nanocrystalline silver particles by a non-pathogenic and agriculturally important fungus T. asperellum.
Poulomi Mukherjee,Mainak Roy,Balaji P. Mandal,Goutam Dey,Prasun K. Mukherjee,Jay Ghatak,Adish Tyagi,S. P. Kale +7 more
TLDR
A controlled and up-scalable biosynthetic route to nanocrystalline silver particles with well-defined morphology using cell-free aqueous filtrate of a non-pathogenic and commercially viable biocontrol agent Trichoderma asperellum is being reported for the first time.Abstract:
A controlled and up-scalable biosynthetic route to nanocrystalline silver particles with well-defined morphology using cell-free aqueous filtrate of a non-pathogenic and commercially viable biocontrol agent Trichoderma asperellum is being reported for the first time. A transparent solution of the cell-free filtrate of Trichoderma asperellum containing 1 mM AgNO3 turns progressively dark brown within 5 d of incubation at 25 °C. The kinetics of the reaction was studied using UV–vis spectroscopy. An intense surface plasmon resonance band at ~410 nm in the UV–vis spectrum clearly reveals the formation of silver nanoparticles. The size of the silver particles using TEM and XRD studies is found to be in the range 13–18 nm. These nanoparticles are found to be highly stable and even after prolonged storage for over 6 months they do not show significant aggregation. A plausible mechanism behind the formation of silver nanoparticles and their stabilization via capping has been investigated using FTIR and surface-enhanced resonance Raman spectroscopy.read more
Citations
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Biological synthesis of metallic nanoparticles.
TL;DR: This review provides an overview of various methods of synthesis of metallic nanoparticles by biological means and indicates that a promising approach to achieve this objective is to exploit the array of biological resources in nature.
Journal ArticleDOI
Biological synthesis of metal nanoparticles by microbes.
TL;DR: The current status of microbial synthesis and applications of metal nanoparticles is presented and several factors such as microbial cultivation methods and the extraction techniques have to be optimized and the combinatorial approach such as photobiological methods may be used.
Journal ArticleDOI
Nano-silver – a review of available data and knowledge gaps in human and environmental risk assessment
TL;DR: In this article, an inventory is made to identify knowledge gaps that have to be filled before risks for both man and the environment can be assessed as reliable as for ‘non-nanosized’ chemicals.
Journal ArticleDOI
Cinnamon zeylanicum bark extract and powder mediated green synthesis of nano-crystalline silver particles and its bactericidal activity.
Muthuswamy Sathishkumar,Krishnamurthy Sneha,Sung Wook Won,Chul-Woong Cho,Seo-Young Kim,Yeoung-Sang Yun +5 more
TL;DR: The bark extract and powder of novel Cinnamon zeylanicum are a good bio-resource/biomaterial for the synthesis of Ag nanoparticles with antimicrobial activity and the surface charge of the formed nanoparticles was highly negative.
Journal ArticleDOI
A review on biosynthesis of silver nanoparticles and their biocidal properties.
TL;DR: It has been demonstrated that Ag NPs arrest the growth and multiplication of many bacteria such as Bacillus cereus, Staphylococcus aureus, Citrobacter koseri, Salmonella typhii, Pseudomonas aeruginosa, Escherichia coli, Klebsiella pneumonia, Vibrio parahaemolyticus and fungus.
References
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Diamond-like amorphous carbon
TL;DR: In this paper, the authors describe the deposition methods, deposition mechanisms, characterisation methods, electronic structure, gap states, defects, doping, luminescence, field emission, mechanical properties and some applications of diamond-like carbon.
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Silver nanoparticles as antimicrobial agent: a case study on E. coli as a model for Gram-negative bacteria
Ivan Sondi,Branka Salopek-Sondi +1 more
TL;DR: These nontoxic nanomaterials, which can be prepared in a simple and cost-effective manner, may be suitable for the formulation of new types of bactericidal materials.
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Dendrimer-Encapsulated Metal Nanoparticles: Synthesis, Characterization, and Applications to Catalysis
TL;DR: Intradendrimer hydrogenation and carbon-carbon coupling reactions in water, organic solvents, biphasic fluorous/organic solvent, and supercritical CO2 are also described.
Journal ArticleDOI
Extracellular biosynthesis of silver nanoparticles using the fungus Fusarium oxysporum
Absar Ahmad,Priyabrata Mukherjee,Satyajyoti Senapati,Deendayal Mandal,M. Islam Khan,Rajiv Kumar,Murali Sastry +6 more
TL;DR: It is observed that aqueous silver ions when exposed to the fungus Fusarium oxysporum are reduced in solution, thereby leading to the formation of an extremely stable silver hydrosol, creating the possibility of developing a rational, fungal-based method for the synthesis of nanomaterials over a range of chemical compositions, which is currently not possible by other microbe-based methods.
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Shape effects in plasmon resonance of individual colloidal silver nanoparticles
TL;DR: In this paper, the effect of size and shape on the spectral response of individual silver nanoparticles was studied and it was shown that specific geometrical shapes give distinct spectral responses.