A growth kinetic study of ultrafine monodispersed silver nanoparticles

Chandni,; Andhariya, Nidhi; Pandey, O. P.; Chudasama, Bhupendra

doi:10.1039/c2ra21912c

Cited by 32 publications

(26 citation statements)

References 48 publications

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“…Based on our previous work, 28,29 SNPs were prepared by two step chemical reduction method. In the first step, oleylamine capped hydrophobic SNPs are produced by reducing AgNO 3 with oleylamine.…”

Section: Synthesis Of Silver Nanoparticlesmentioning

confidence: 99%

“…We have observed that the size of the NPs and their aggregation is strongly influenced by various synthesis parameters like concentration of AgNO 3 and oleylamine, nucleation temperature, nucleation time, growth temperature, and growth time. 29 Effect of each of these parameters on the particle quantity (yield) and quality (size, size distribution, and shape) were investigated in detail and reported elsewhere. 29 In the present study, we have prepared two samples of SNPs with average hydrodynamic size of 83 and 59 nm, respectively.…”

Section: Synthesis Of Silver Nanoparticlesmentioning

confidence: 99%

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Antibacterial activity of silver: The role of hydrodynamic particle size at nanoscale

Khurana

Vala

Andhariya

et al. 2013

J Biomedical Materials Res

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Silver shows the highest antimicrobial activities amongst all metals. It is better than many first line antibiotics. The antimicrobial properties of silver can be tuned by altering its physical and surface properties. Researchers have demonstrated enhancement in the antibacterial properties of silver with decreasing particle size from bulk to nano. In the present article, we study the effect of particle size of silver at nanoscale on their antimicrobial properties. Two samples of silver nanoparticles (SNPs) of same physical size (≈8 nm) but different hydrodynamic size (59 and 83 nm) are prepared by chemical reduction of AgNO3 with oleylamine followed by phase transfer with triblock copolymer Pluronic F-127. Their antimicrobial properties are investigated by microdilution method against clinically important strains of gram positive (S. aureus and B. megaterium) and gram negative (P. vulgaris and S. sonnei) bacteria. Nearly 38-50% enhancement in the antibacterial action of SNPs was observed when their hydrodynamic size was reduced to 59 nm from 83 nm. It has been observed that the antibacterial action of SNPs was governed by their hydrodynamic size and not by their crystallite and physical size. The phenomenological model was also proposed which makes an attempt to explain the microscopic mechanism responsible for the size dependent antibacterial activities of silver.

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Section: Synthesis Of Silver Nanoparticlesmentioning

confidence: 99%

Section: Synthesis Of Silver Nanoparticlesmentioning

confidence: 99%

Antibacterial activity of silver: The role of hydrodynamic particle size at nanoscale

Khurana

Vala

Andhariya

et al. 2013

J Biomedical Materials Res

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“…This observation is consistent with the presence of single plasmon peak in UV-Visible spectroscopy. Size distribution histogram was fitted with lognormal size distribution function [10]. The hydrodynamic size corresponding to the long axis of GNRs is ≈ 60 nm while the short axis is ranging between 2-20 nm.…”

Section: Resultsmentioning

confidence: 99%

Study of seed aging in seed-mediated synthesis of IR responsive gold nanorods

Kaur

Chudasama

2014

AIP Conference Proceedings

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Synthesis of silver nanosheets onto solid substrates by using seed-mediated growth method AIP Conf. Proc. 1554, 79 (2013); 10.1063/1.4820288Fabrication and characterization of metal-semiconductor-metal nanorod using template synthesis Abstract. Gold nanorods (GNRs) are one of the potential candidates for Plasmonic Photothermal Therapy (PPTT). In this article we report the synthesis of IR responsive GNRs by seed mediated method and investigated the role of seed aging on the synthesis of GNRs. The Longitudinal surface plasmon resonance (LSPR) band blue shifts while transverse surface plasmon resonance (TSPR) band does not show any considerable drift with seed aging. A fresh seed solution is essential for the synthesis of IR responsive GNRs. No gold nanorods are formed when seed solution is aged for 72 h.

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“…Values close to zero indicate a monodispersion (particles with equivalent sizes), whereas high values indicate a tendency towards heterogeneous suspensions. The authors agree that values below 0.2 characterize a suspension trend to monodispersion (CHANDINI, et al, 2013). This parameter is quantified by the result of the hydrodynamic diameter size distribution of the agglomerates of AgNPs in the solution conducted by DLS.…”

Section: Synthesis and Characterizationmentioning

confidence: 87%

Synthetic wastewaters treatment by electrocoagulation to remove silver nanoparticles produced by different routes

Matias

Melegari

Vicentini

et al. 2015

Journal of Environmental Management

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Nanoscience is a field that has stood out in recent years. The accurate long-term health and environmental risks associated with these emerging materials are unknown. Therefore, this work investigated how to eliminate silver nanoparticles (AgNPs) from synthetic effluents by electrocoagulation (EC) due to the widespread use of this type of nanoparticle (NP) in industry and its potential inhibition power over microorganisms responsible for biological treatment in effluent treatment plants. Synthesized AgNPs were studied via four different routes by chemical reduction in aqueous solutions to simulate the chemical variations of a hypothetical industrial effluent, and efficiency conditions of the EC treatment were determined. All routes used silver nitrate as the source of silver ions, and two synthesis routes were studied with sodium citrate as a stabilizer. In route I, sodium citrate functioned simultaneously as the reducing agent and stabilizing agent, whereas route II used sodium borohydride as a reducing agent. Route III used D-glucose as the reducing agent and sodium pyrophosphate as the stabilizer; route IV used sodium pyrophosphate as the stabilizing agent and sodium borohydride as the reducing agent. The efficiency of the EC process of the different synthesized solutions was studied. For route I, after 85 minutes of treatment, a significant decrease in the plasmon resonance peak of the sample was observed, which reflects the efficiency in the mass reduction of AgNPs in the solution by 98.6%. In route II, after 12 minutes of EC, the absorbance results reached the detection limit of the measurement instrument, which indicates a minimum reduction of 99.9% of AgNPs in the solution. During the 4 minutes of treatment in route III, the absorbance intensities again reached the detection limit, which indicates a minimum reduction of 99.8%. In route IV, after 10 minutes of treatment, a minimum AgNP reduction of 99.9% was observed. Based on these results, it was possible to verify that the solutions containing citrate considerably increased the necessary times required to eliminate AgNPs from the synthesized effluent, whereas solutions free of this reagent showed better results on floc formation and, therefore, are best for the treatment. The elimination of AgNPs from effluents by EC proved effective for the studied routes.

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A growth kinetic study of ultrafine monodispersed silver nanoparticles

Cited by 32 publications

References 48 publications

Antibacterial activity of silver: The role of hydrodynamic particle size at nanoscale

Antibacterial activity of silver: The role of hydrodynamic particle size at nanoscale

Study of seed aging in seed-mediated synthesis of IR responsive gold nanorods

Synthetic wastewaters treatment by electrocoagulation to remove silver nanoparticles produced by different routes

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