Gold nanoparticles formation in the aqueous system of gold(III) chloride complex ions and hydrazine sulfate—Kinetic studies

Streszewski, Bartłomiej; Jaworski, Wiktor; Pacławski, K.; Csapó, Edit; Dékány, Imre; Fitzner, K.

doi:10.1016/j.colsurfa.2012.01.031

Cited by 60 publications

(58 citation statements)

References 52 publications

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“…In order to quantitatively appraise attachment of Au-NPs to MD, WDX (Wavelength-dispersive X-ray spectroscopy) analysis was performed. The analysis confirms the presence of gold phase in the prepared nanoparticles (Figure 8) [46] and Figure 9 shows the efficiency of synthesis in terms of relative counts of Fe: Au where hydrazine sulfate reducing agent has shown to produce the best nanoparticles compared to other synthesis methods.…”

Section: Ftir and Wdx Evaluationsupporting

confidence: 53%

“…The XRD patterns contain diffraction peaks at 2θ equal to 38, 44.3, 64.5 and 77.9 which represent (111), (200), (220) and (311) crystallographic plane respectively which prove the FCC structure of gold (JCPDS No.00-04-0784) [26] [44]- [46]. The broadening of the most intense peak of these nanoparticles demonstrates that the small size Au-NPs could be calculated by using the Scherrer equation (Equation (1)) [47].…”

Section: Xrd Analysismentioning

confidence: 99%

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Imaging and Therapeutic Applications of Optical and Thermal Response of SPION-Based Third Generation Plasmonic Nanodendrimers

Tajabadi¹,

Khosroshahi²,

Bonakdar³

2015

OPJ

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In this study, 9 nm superparamagnetic iron oxide nanoparticles (SPION) were functionalized by polyamidoamine (PAMAM) dendrimer. Using tetracholoroauric acid (HAuCl 4 ), magnetodendrimer (MD) samples were conjugated by gold nanoparticles (Au-NPs). Two different reducing agents, i.e. sodium borohydride and hydrazine sulfate, and pre-synthesized 10-nm Au-NP were used to evaluate the efficiency of conjugation method. The samples were characterized using X-ray diffractometry (XRD), transmission electron microscopy (TEM), Fourier transform infrared (FTIR) spectroscopy, UV-visible spectroscopy and fluorescence spectroscopy. The results confirmed that AuNPs produced by sodium borohydrate and the pre-synthesized 10-nm Au-NPs were capped by MDs whereas the Au-NP prepared by hydrazine sulfate as a reducing agent was entrapped by MDs. Optical properties of the MDs were studied by laser-induced fluorescence spectroscopy (LIF) within a wide range of visible spectrum. Also, based on the thermal analysis, all synthesized nanostructures exhibited a temperature increase using 488 nm and 514 nm wavelengths of a tunable argon laser. The new iron oxide-dendrimer-Au NPs synthesized by sodium borohydrate (IDANaBH4) produced the highest temperature increase at 488 nm whereas the other nanostructures particularly pure Au-NPs produced more heating effect at 514 nm. These findings suggest the potential application of these nanocomposites in the field of bioimaging, targeted drug delivery and controlled hyperthermia. M. Tajabadi et al.213

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Section: Ftir and Wdx Evaluationsupporting

confidence: 53%

Section: Xrd Analysismentioning

confidence: 99%

Imaging and Therapeutic Applications of Optical and Thermal Response of SPION-Based Third Generation Plasmonic Nanodendrimers

Tajabadi¹,

Khosroshahi²,

Bonakdar³

2015

OPJ

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“…The diffraction peaks at 2ϑ = 38.23°, 44.44°, 64.65°, 77.67°, 81.83°and 98.28°can be assigned to regular (111), (200), (220), (311), (222) and (400) reflections of fcc gold, respectively, with lattice parameter of a = 0.40740 nm [37] on an amorphous background. Primary size of particles was determined from the broadening of XRD reflections using the Scherrer formula, 2 nm was found for the average diameter [38]. Appearance of the broad peak centered at the 20-22 range can probably be explained with multiple reasons.…”

Section: Thermogravimetry and Xrd Resultsmentioning

confidence: 99%

Fine structure of gold nanoparticles stabilized by buthyldithiol: Species identified by Mössbauer spectroscopy

Кузманн

Csapó

Stichleutner

et al. 2016

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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“…where x αβ (0) = 0 and lim t→∞ x αβ (t) = d 0 [4,12]. However, for c 0 = 0, x(t) cannot be expressed as a combination of finite number of elementary functions.…”

mentioning

confidence: 99%

“…(1), (8), and (10) become identical to the rate equations analyzed in Refs. [12,13] (c 0 = 0) and [4][5][6]8] (c 0 = 0). These equations have the same form for arbitrary choice of K ij and F ij , hence the reaction rate of (ii), proportional to the total mass of the clusters (M 1 ), does not depend on presence of the coagulation or fragmentation.…”

mentioning

confidence: 99%

Exact solutions of kinetic equations in an autocatalytic growth model

Jędrak

2013

Phys. Rev. E

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Kinetic equations are introduced for the transition-metal nanocluster nucleation and growth mechanism, as proposed by Watzky and Finke. Equations of this type take the form of Smoluchowski coagulation equations supplemented with the terms responsible for the chemical reactions. In the absence of coagulation, we find complete analytical solutions of the model equations for the autocatalytic rate constant both proportional to the cluster mass, and the mass-independent one. In the former case, ξ k = s k (ξ1) ∝ ξ k 1 /k was obtained, while in the latter, the functional form of s k (ξ1) is more complicated. In both cases, ξ1(t) = hµ(Mµ(t)) is a function of the moments of the mass distribution. Both functions, s k (ξ1) and hµ(Mµ), depend on the assumed mechanism of autocatalytic growth and monomer production, and not on other chemical reactions present in a system. PACS numbers: Keywords:Nucleation and growth phenomena, resulting in occurrence of a new phase from a homogeneous host phase, are ubiquitous in nature [1,2]. In many cases, apart from processes of coagulation and fragmentation, chemical reactions are also present in a system. Frequently, the chemical reactions account for phenomena studied by polymer and colloidal science.Nucleation and subsequent growth of metal nanoclusters in aqueous solution is a topic of considerable current interest, since solution route synthesis is one of the most convenient methods of producing transition-metal nanoparticles [3]. However, applicability of this method depends on the ability to control size and shape of the produced nanoparticles, which determine their unique optical, electronic and catalytic properties. For that reason, theoretical models capable of predicting the cluster size distribution, as well as its dependence on the experimentally controllable parameters of the system, are required.A mechanism of transition-metal colloidal nanoparticle formation has been proposed by Watzky and Finke [4], cf. [5][6][7][8]. The WF mechanism consists of (i) slow monomer, i.e., the zerovalent transition-metal atom (B 1 ) production due to reduction reaction A → B 1 of a metal precursor (A), usually a transition-metal complex coordination compound, (ii) fast autocatalytic reduction reaction A+B i → B i+1 taking place on the surface of growing metal nanoparticles, consisting of i atoms (B i ), and (iii) process of coagulation B i + B j ⇄ B i+j , reversible or otherwise. In the original WF scheme [4], step (iii) had not been considered. Irreversible coagulation was first introduced in [5].For the transition metals in which higher oxidation states are present, e.g. Au, at least one additional preliminary step of the form (iv) P → A is needed [9][10][11][12][13].As an excess of the reducing agent is usually used in the reactions (i), (ii), (iv), its concentration is fairly timeindependent, and all chemical reactions may be treated as irreversible. Furthermore, (i) and (iv) may be treated as reactions of pseudo-first order, while (ii) as a reaction of pseudo-second order.The WF mechani...

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Gold nanoparticles formation in the aqueous system of gold(III) chloride complex ions and hydrazine sulfate—Kinetic studies

Cited by 60 publications

References 52 publications

Imaging and Therapeutic Applications of Optical and Thermal Response of SPION-Based Third Generation Plasmonic Nanodendrimers

Imaging and Therapeutic Applications of Optical and Thermal Response of SPION-Based Third Generation Plasmonic Nanodendrimers

Fine structure of gold nanoparticles stabilized by buthyldithiol: Species identified by Mössbauer spectroscopy

Exact solutions of kinetic equations in an autocatalytic growth model

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