Formation of monodisperse silver nanoparticles in poly(vinylpyrrollidone) matrix using spray pyrolysis

Lee, Kyung Hee; Rah, Sang Chun; Kim, Sun-Geon

doi:10.1007/s10971-007-1675-y

Cited by 28 publications

(18 citation statements)

References 12 publications

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“…On the other hand, the growth of silver particles in silver-PVA (MW = 30,000) composites was more like in silver-PVP composites (Lee and Kim 2005): Primary silver particles were spherical, while their size became monodisperse and remained mostly the same at 15 nm at the temperatures between 200 and 300…”

Section: Temperature Effectmentioning

confidence: 97%

“…Thus, even though PVA and dextran have reducing power on the metal salt (Ma et al 2005) as PVP, the reactivity of the former polymers could not be realized until the solutions passed out of the pyrolysis reactor. Such high stability of the precursor solutions, therefore, enabled their direct application for ultrasonification and subsequent pyrolysis, without their pre-acidification, which had been required for PVP (Lee and Kim 2005).…”

Section: Stability Of the Precursor Solution To Be Sprayedmentioning

confidence: 99%

“…Recently, we had used aerosol method to prepare monodisperse silver nanoparticles self-organized in matrices of Poly-(vinylpyrrollidone)(PVP), during short flight of sprayed droplets containing only silver salt and stabilizer in water, in a hot-wall tubular reactor (Lee and Kim 2005). In order to obtain such particles, the minimum initial concentration ratio of the polymer to silver nitrate significantly reduced to as low as 1, based on mass, while the maximum concentration of starting silver nitrate was noticeably raised to as high as 0.1 M. Under the same condition otherwise, the lower limit of the temperature for reduction of the nitrate was lowered from 450…”

Section: Introductionmentioning

confidence: 99%

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Growth of Monodisperse Silver Nanoparticles in Polymer Matrix by Spray Pyrolysis

Kim¹,

Lee²,

Kim³

2006

Aerosol Science and Technology

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Silver nanoparticles were simply prepared by spray pyrolysis of aqueous solutions of AgNO 3 , and dextran or Poly (vinylalcohol) (PVA) without any reducing agent. Monodisperse particles well-organized in polymer matrix were obtained above a certain critical ratio of polymer to silver nitrate, usually around 1, and below decomposition temperatures of the polymer. Otherwise, the silver particles grew polydisperse due to the imperfect confinement of the polymer. Their shapes varied from facetted with dextran to spherical with PVA, depending on the interaction of silver and the polymer. The confinement increased and thus the critical ratio decreased by increasing the molecular weight of the polymer and replacing PVA by dextran. Above the ratio, the particles got smaller with the concentration of dextran, while their size did not vary in PVA due to its configuration. INTRODUCTIONSilver nanoparticles have attracted much attention due to their potential applications to the components of conducting metal polymer systems, nonlinear optical materials, selective and active catalysts and surface-enhanced Raman scattering. They have been often prepared by aqueous-phase reduction of silver salt in the presence of stabilizer such as Poly(vinylpyrrollidone) (Choi et al.

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Section: Temperature Effectmentioning

confidence: 97%

Section: Stability Of the Precursor Solution To Be Sprayedmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Growth of Monodisperse Silver Nanoparticles in Polymer Matrix by Spray Pyrolysis

Kim¹,

Lee²,

Kim³

2006

Aerosol Science and Technology

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“…The thermal stability of nanocomposite decreases by 50°C compared with that of the initial polymer, and thermal destruction of the nanocomposites starts at 270°C. In the paper, 18 the authors also observed decrease in thermal stability of the polymer due to the presence of silver particles in nanocomposites.…”

Section: Thermogravimetric Analysismentioning

confidence: 89%

Nontoxic hydrophilic polymeric nanocomposites containing silver nanoparticles with strong antimicrobial activity

Pozdnyakov¹,

Emel’yanov²,

Кузнецова³

et al. 2016

IJN

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New nontoxic hydrophilic nanocomposites containing metallic silver nanoparticles (AgNPs) in a polymer matrix were synthesized by the chemical reduction of silver ions in an aqueous medium. A new nontoxic water soluble copolymer of 1-vinyl-1,2,4-triazole and N-vinylpyrrolidone synthesized by free radical-initiated polymerization was used as a stabilizing agent. Transmission electron microscopy, scanning electron microscopy, ultraviolet-visible spectroscopy, Fourier transform infrared spectroscopy, X-ray diffraction, atomic absorption, and thermogravimetric analysis were used to characterize polymeric AgNPs nanocomposites. The results showed that the diameter of the synthesized AgNPs ranged from 2 to 6 nm. The toxicity of the initial copolymer of 1-vinyl-1,2,4-triazole and N-vinylpyrrolidone and its nanocomposite with AgNPs was found to be more than 5,000 mg/kg. The synthesized AgNP polymeric nanocomposite showed significant antimicrobial activity against different strains of Gram-negative and -positive bacteria. The minimum inhibitory concentrations suppressing the growth of the microorganisms ranged from 0.5 to 8 µg/mL and the minimum bactericidal concentrations ranged from 0.5 to 16 µg/mL. The fabricated AgNP nanocomposites are promising materials for the design of novel nontoxic hydrophilic antiseptics and antimicrobial components for medical purposes.

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“…Table 1 summarizes the previous reports on the control of the morphology and size of silver particles using the precursor types and precursor concentration in different spray pyrolysis methods [12][13][14][15][16][17][18][19]. As seen in Table 1, the particle sizes highly depend on the precursor concentration (i.e., the lower precursor concentration the smaller particle size) [15][16][17][18][19]. Titanium dioxide is typically used as a pigment because of its high refractive index.…”

Section: Introductionmentioning

confidence: 99%

Orta frekans indüksiyon yöntemi ile nano-metal ve nano-metal oksit partikül sentezinin incelenmesi

Kartal¹,

Kiliç²,

Sireli³

et al. 2016

SAUFenBilDer

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Synthesis of Ag, Fe2O3 and TiO2 was investigated in medium frequency induction system to determine ideal conditions for the particle production with desired size. A high frequency ultrasonic generator was attached to induction furnace to synthesize particles from solutions of AgNO3, FeCl3, titanium tetra iso-propoxide (TTIP). Experiments were carried out under concentrations of 0.1 M, 0.01 M at constant parameters; 15 min. time, 800 ºC temperature, 1.0 L/min. flow rate. X-ray diffraction (XRD) studies confirmed the particle formation without contamination. Scanning electron microscopy (SEM) examinations revealed that size of particles were in the range of 50 nm to 400 nm.Keywords: nanoparticle, titanium dioxide, iron oxide, silver, medium frequency induction Orta frekans indüksiyon yöntemi ile nano-metal ve nano-metal oksit partikül sentezinin incelenmesi ÖZ Bu çalışmada, gümüş (Ag), demir oksit (Fe2O3) ve titanyum dioksit (TiO2) partiküllerinin nano-boyutta üretimleri için gerekli şartlar, orta frekanslı indüksiyon partikül üretim sisteminde incelenmiştir. Partikül üretim sistemi; orta frekanslı indüksiyon fırını ile yüksek frekans ultrasonik atomizerin birleştirilmesi ile oluşturulmuştur. Bahsi geçen nanopartiküllerin üretimi 0,1 M ve 0,01 M konsantrasyonların da AgNO3, FeCl3.6H2O, Titanyum tetra izopropoksit (TTIP) başlangıç malzemeleri kullanılarak gerçekleştirilmiştir. Deneyler, sabit 800 ºC reaksiyon sıcaklığı, 1.0 L/dk. taşıyıcı gaz debisi ve 15 dk. deney süresi şartlarında yapılmıştır. XRD ve SEM kullanılarak karakterize edilen nanopartiküllerin safsızlık içermediği ve 50 nm ile 400 nm arasında değişen boyutlarda oldukları görülmüştür.

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Formation of monodisperse silver nanoparticles in poly(vinylpyrrollidone) matrix using spray pyrolysis

Cited by 28 publications

References 12 publications

Growth of Monodisperse Silver Nanoparticles in Polymer Matrix by Spray Pyrolysis

Growth of Monodisperse Silver Nanoparticles in Polymer Matrix by Spray Pyrolysis

Nontoxic hydrophilic polymeric nanocomposites containing silver nanoparticles with strong antimicrobial activity

Orta frekans indüksiyon yöntemi ile nano-metal ve nano-metal oksit partikül sentezinin incelenmesi

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