Formation of Gold and Silver Nanoparticles in Aqueous Solution of Sugar-Persubstituted Poly(amidoamine) Dendrimers

Esumi, Kunio; Hosoya, Tomoyuki; Suzuki, Akihiro; Torigoe, Kanjiro

doi:10.1006/jcis.2000.6849

Cited by 141 publications

(100 citation statements)

References 18 publications

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“…This result is similar to the finding of Esumi et al 15 that in acid solution, no reduction of Ag + ions took place in the presence of sugar-persubstituted poly(amidoamine) dendrimers, which may be due to the lack of favorable thermodynamic conditions for the reduction of Ag + . Contact time was 72 h.…”

Section: Effect Of Bioreduction Timesupporting

confidence: 93%

Biosorption and bioreduction of diamine silver complex by Corynebacterium

Zhang

et al. 2004

J of Chemical Tech & Biotech

172

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Corynebacterium strain SH09 separated from a silver mine was used for biosorption and bioreduction of diamine silver complex. The biosorption of the diamine silver complex was better than that of silver ions and the maximum of the former was about 350 (mg Ag) (g dried biomass) −1 . After dried cells of SH09 were resuspended in the aqueous solution of diamine silver complex in the dark at 60• C for more than 72 h, transmission electron microscopy (TEM) observations showed that a large quantity of black particles whose diameter ranged from 10 to 15 nm were formed on the cell wall. The particles were identified as being silver nanoparticles by X-ray diffraction (XRD) and UV-vis spectroscopy. Under the same conditions, no bioreduction of silver nitrate was found. According to IR spectra, some functional groups, such as the amide of the proteins, were involved in the processes of biosorption and bioreduction.

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Section: Effect Of Bioreduction Timesupporting

confidence: 93%

Biosorption and bioreduction of diamine silver complex by Corynebacterium

Zhang

et al. 2004

J of Chemical Tech & Biotech

172

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“…Figure 1(c) presents a plot of the absorbance at 408 nm as a function of time for AgNPs produced with 1.0 mM (red solid circles) and 10.0 mM (black solid squares) SEAR. Interestingly, the formation of AgNPs in both cases passed through an induction period (nucleation process) of approximately 40 min (Figure 1(c), inset) prior to exponential absorbance increase related to autocatalytic growth [37] of AgNPs. Another point is that the absorbances recorded at 1.0 mM SEAR were slightly higher than those at 10.0 mM SEAR up to 40 min (inset of Figure 1(c)).…”

Section: Synthesis and Characterization Of Sear-agnpsmentioning

confidence: 98%

Dual Role of a Ricinoleic Acid Derivative in the Aqueous Synthesis of Silver Nanoparticles

Costa

Neto

Silva

et al. 2017

Journal of Nanomaterials

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We show that sodium 9,10-epoxy-12-hydroxytetradecanoate (SEAR), an epoxidized derivative of ricinoleic acid, simultaneously functioned as reducing and stabilizing agents in the synthesis of silver nanoparticles in alkaline aqueous medium. The advantage of using SEAR is its biodegradability and nontoxicity, which are important characteristics for mitigation of environmental impact upon discharge of nanoparticles into terrestrial and aquatic ecosystems. The SEAR concentration was found to impact considerably the size distribution of silver nanoparticles (AgNPs). A concentration below the SEAR critical micelle concentration (CMC) generated 23 nm sized AgNPs with 10 nm standard deviation, while 50 nm sized AgNPs ( = 21 nm) were obtained at a concentration above the SEAR CMC. FTIR analysis revealed that the carboxylate that constitutes the SEAR hydrophilic head binds directly to the AgNPs surface promoting stabilization in solution. Finally, AgNPs turned into Ag 2 S upon contact with wastewater samples from Wastewater Treatment Plant at Federal University of Rio Grande do Norte (UFRN), Brazil, which is an interesting result, since Ag 2 S is more environmentally friendly than pure AgNPs.

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“…Synthesis method of nanoparticles plays an important role in its technological advancement as it is the primary step to tune their physical, electronic, and optical properties of the synthesized nanoparticles by varying size, shape and surface chemistry (Wiley et al 2007;Sharma et al 2009;Naik et al 2002). Conventional procedures such as chemical reduction (Szczepanowicz et al 2010), microwave-aided method (Zhu et al 2013) and photocatalytic reaction (Scaiano et al 2009) involve a variety of toxic chemicals like surfactants, polymers, starch, citrates, hydrides, lipids, etc., for synthesis of stable and agglomeration-free Ag nanomaterials but the by-products of these procedures were found to be hazardous to animals and environment (Welton 1999;Vinod et al 2011;Chen et al 2005;Bakshi et al 2008;Bakshi 2009;Esumi et al 2000). Recently, biological methods using biological microorganism, plant extract, and enzymes have proved itself an easy, cost-effective and ecofriendly alternative synthesis route of metallic nanoparticle compared to conventional procedures (Li et al 2007;Mittal et al 2013;Tamulya et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Plant-mediated synthesis of silver nanoparticles using parsley (Petroselinum crispum) leaf extract: spectral analysis of the particles and antibacterial study

2014

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Synthesis of nanomaterials may involve various routes including physical, chemical and biological approaches. Here, the biological green route was chosen to prepare silver nanoparticles from silver salts to avoid the requirement of costly instruments and involvement of hazardous chemicals as well. To make the process clean and green, leaf extract of parsley (Petroselinum crispum) was used to synthesize Ag nanoparticles at room temperature. The formation of Ag-nanoparticles was monitored by UV-Vis spectroscopy. The presence of silver in the sample and its crystalline nature were verified by X-ray diffraction (XRD) analysis. The size distribution profile and particle size in the suspension were manipulated from dynamic light scattering (DLS) pattern. The shape, size and morphology of the biogenic nanoparticles were studied using high resolution transmission electron microscope (TEM). Fourier transform infra-red spectroscopy was used to detect the biomolecules responsible for reduction of silver ions. These biogenic Ag-nanoparticles showed appreciable antibacterial efficacy against three bacteria-Klebsiella pneumoniae, Escherichia coli and Staphylococcus aureus.

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Formation of Gold and Silver Nanoparticles in Aqueous Solution of Sugar-Persubstituted Poly(amidoamine) Dendrimers

Cited by 141 publications

References 18 publications

Biosorption and bioreduction of diamine silver complex by Corynebacterium

Biosorption and bioreduction of diamine silver complex by Corynebacterium

Dual Role of a Ricinoleic Acid Derivative in the Aqueous Synthesis of Silver Nanoparticles

Plant-mediated synthesis of silver nanoparticles using parsley (Petroselinum crispum) leaf extract: spectral analysis of the particles and antibacterial study

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