Studies on the kinetics of growth of silver nanoparticles in different surfactant solutions

Khan, Zaheer; Al-Thabaiti, Shaeel A.; El-Mossalamy, El-sayed El-Badawy; Obaid, Abdullah Y.

doi:10.1016/j.colsurfb.2009.05.030

Cited by 63 publications

(26 citation statements)

References 20 publications

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“…As can be seen by shape and size distribution, the particles are highly spherical and monodisperse with an average nanoparticle size in the range from 10-15 nm average which coincides with Zaheer Khan et al [25] The electron diffraction pattern suggests that silver nanoparticles are single crystalline of fcc phase with their (111) planes tended to be preferentially oriented. 11 higher concentration (4 mM) no crucial antimicrobial activity is found.…”

Section: Structural Analysissupporting

confidence: 82%

Systematic investigation on hydrazine hydrate assisted reduction of silver nanoparticles and its antibacterial properties

Gurusamy¹,

Rajavel

Boopathy³

et al. 2016

Inorganic and Nano-Metal Chemistry

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Interesting tunable physical chemical properties of silver nanoparticles under metal nanoparticle family can have great impact in modern technologies specially concerned with biological applications. The systematic investigation on synthesis of silver nanoparticle is performed by tuning the concentration of HH, AgNO 3 and PVP. The structural and morphological analysis were characterized using XRD, FE-SEM, TEM. The formation of stable silver nanoparticle differentiated with tunable textured colours of highly crystalline (fcc) quality are remarked with particle size 10-15 nm. The antibacterial activities against E. coli and S. aureus confers well for the concentration of 6 mM HH: 3 mM AgNO 3 : 3 mM PVP.

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Section: Structural Analysissupporting

confidence: 82%

Systematic investigation on hydrazine hydrate assisted reduction of silver nanoparticles and its antibacterial properties

Gurusamy¹,

Rajavel

Boopathy³

et al. 2016

Inorganic and Nano-Metal Chemistry

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“…This method of Ag‐NPs synthesis was selected due to the fact that the reaction stoichiometry is well known , meaning that, on the basis of the silver ion current concentration, we can also calculate the values of the corresponding concentrations of NaOH and N 2 H 4 . At the same time, the stabilization of Ag‐NPs by sodium citrate is believed to occur according to an electrostatic mechanism ; thus the stabilizing shell is not “rigid,” and its effect on the reaction mechanism can be neglected.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, researchers usually describe the kinetics of the synthesis of silver nanoparticles using a number of assumptions. Thus, in it is assumed that the rate of synthesis of silver nanoparticles depends on the rate of chemical reactions (transformations) Ag + + e − → Ag 0 . However, these kinetic models describing nanoparticles formation do not include the phase transformations that occur in the system, namely the catalytic role of the interface.…”

Section: Introductionmentioning

confidence: 99%

The Kinetic Rate Law for the Autocatalytic Growth of Citrate‐Stabilized Silver Nanoparticles

Kytsya¹,

Bazylyak²,

Hrynda³

et al. 2015

Int J of Chemical Kinetics

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The formation of sodium citrate stabilized spherical silver nanoparticles synthesized by homogeneous nucleation in aqua solutions was monitored by the method of direct potentiometry. It was observed that the kinetic curve of Ag+ ions reduction can be described by the Finke–Watzky (FW) autocatalytic two–step mechanism in the case of a large excess of hydrazine and NaOH. To expand the FW minimalistic model, the impact of the starting concentrations of the reagents on the kinetics of Ag nanoparticles synthesis was studied. It was determined that the nucleation stage is limited by the homogeneous process of ions Ag+ reduction, and the reaction orders for the all reagents are calculated. A surface–dependent model of Ag nanoparticle growth is proposed, which takes into account the change in the hydrazine and alkali concentrations; the rate constants of the pseudoelementary reactions are also calculated.

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“…The progress of reaction was recorded spectrophotometrically at definite time intervals by pipetting aliquots of reaction mixture. The absorbance of product was measured at 540 nm and reaction was monitored for 120 h. Reaction rate constant K was calculated from slop of initial part of the graph log (A a -A t ) versus time where A a is the final absorbance and A t is absorbance at different time intervals [17][18][19].…”

Section: Kinetics Of Aunp Synthesismentioning

confidence: 99%

Kinetics of Synthesis of Gold Nanoparticles by Acinetobacter sp. SW30 Isolated from Environment

et al. 2016

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Cell biomass and metal salt concentration have great influence on morphology of biosynthesized nanoparticle. The aim of present study was to evaluate the effect of varying cell density and gold salt concentrations on synthesis of nanoparticles and its morphology, which has not been studied in bacteria till now. When cells of Acinetobacter sp. SW30 were incubated with different cell density and gold chloride concentrations, tremendous variation in color of colloidal solution containing gold nanoparticles (AuNP) was observed indicating variation in their size and shapes. Surprisingly, monodispersed spherical AuNP of size *19 nm were observed at lowest cell density and HAuCl 4 salt concentration while increase in cell number resulted in formation of polyhedral AuNP (*39 nm). Significance of this study lays in the fact that the shape and dispersity of AuNP can be customized depending up on the requirement. FTIR spectrum revealed shift from 3221 to 3196 cm -1 indicating the presence and role of amino acids in Au 3? reduction while possible involvement of amide I and II groups in stabilization of AuNP. The rate constant was calculated for cell suspension of 2.1 9 10 9 cfu/ml challenged with 1.0 mM HAuCl 4 , incubated at 30°C and pH 7 using the slopes of initial part of the plot log (A a -A t ) versus time as 1.99 9 10 -8 M.Also, this is the first study to report the kinetics of gold nanoparticle synthesis by Acinetobacter sp. SW30.

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Studies on the kinetics of growth of silver nanoparticles in different surfactant solutions

Cited by 63 publications

References 20 publications

Systematic investigation on hydrazine hydrate assisted reduction of silver nanoparticles and its antibacterial properties

Systematic investigation on hydrazine hydrate assisted reduction of silver nanoparticles and its antibacterial properties

The Kinetic Rate Law for the Autocatalytic Growth of Citrate‐Stabilized Silver Nanoparticles

Kinetics of Synthesis of Gold Nanoparticles by Acinetobacter sp. SW30 Isolated from Environment

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