Preparation of Silver Nanoparticles by Chemical Reduction Method

Huazhong University of Science and Technology, Wu-han-shih, Hubei, China
Colloids and Surfaces A Physicochemical and Engineering Aspects (Impact Factor: 2.75). 04/2005; 256(2-3):111-115. DOI: 10.1016/j.colsurfa.2004.12.058


In the solution containing polyvinyl pyrrolidone (PVP), silver nitrate was reduced by the glucose, and silver particles were generated. The possible reaction process is discussed in this paper. Sodium hydroxide was used to enhance the reaction velocity. When the mole ratio of NaOH to AgNO3 was ranged from 1.4 to 1.6, the colloid kept stable and no Ag+ was traced. The particles and colloids were also analyzed by the X-ray diffraction (XRD), transmission electron microscopy (TEM) and UV–visible (UV–vis) spectrophotometer. The TEM photo indicated that with the increase in PVP, the particles dispersed better; and if the weight ratio of PVP to AgNO3 is no less than 1.5, the particles dispersed individually in a colloid form. The agglomeration of particles also was influenced by the mixing speed of the reactants. The XRD spectrums showed that the particles were silver simple substance if the reductant was sufficient and the mixing speed of the reactants was slow enough.

46 Reads
  • Source
    • "The leather samples treated with 20 mg/cm 2 of nAg showed the highest antibacterial activity against E. coli with 99.25% of bacteria removal (Table 2). The synthesis of silver nanoparticles is well understood and several methods leading to a good control over the size and shape of the particles have been developed (Huang et al. (2004); Liu et al. (2005); Wang et al. (2005). Gaidau et al. (2009) obtained silver nanoparticles (2.69 nm) electrochemically as colloidal silver solutions (29.27 ppm) and treated fur skins by immersion in this solution , which had a content of 490 ppm Ag. "
    [Show abstract] [Hide abstract]
    ABSTRACT: In this study, the characterization and the antimicrobial properties of nano silver (nAg) coating on leather were investigated. For this purpose, turbidity, viscosity and pH of nAg solutions prepared by the sol-gel method were measured. The formation of films from these solutions was characterized according to temperature by Differential Thermal Analysis-Thermogravimetry (DTA-TG) equipment. The surface morphology of treated leathers was observed using Scanning Electron Microscopy (SEM). The antimicrobial performance of nAg coatings on leather materials to the test microorganisms as Escherichia coli, Staphylococcus aureus, Candida albicans and Aspergillius niger was evaluated by the application of qualitative (Agar overlay method) and quantitative (percentage of microbial reduction) tests. According to qualitative test results it was found that 20 μg/cm2 and higher concentrations of nAg on the leather samples were effective against all microorganisms tested. Moreover, quantitative test results showed that leather samples treated with 20 μg/cm2 of nAg demonstrated the highest antibacterial activity against E. coli with 99.25% bacterium removal, whereas a 10 μg/cm2 concentration of nAg on leather was enough to exhibit the excellent percentage reduction against S. aureus of 99.91%. The results are promising for the use of colloidal nano silver solution on lining leather as antimicrobial coating.
    03/2015; 46(1):41-48. DOI:10.1590/S1517-838220130446
  • Source
    • "In contrast to chemical nanofabrication methods, laser ablation can be performed in a clean, well-controlled environment, such as deionized water, giving rise to the production of ultrapure nanomaterials. The use of these particles decreases toxicity risks, which are especially important in biosensing and imaging applications [12] [13] [14]. In addition, laser pulse energy, wavelength, spot size, and pulse width are useful parameters to control the size and morphology of NPs produced by the PLA method [15] [16] [17] [18] [19] [20] [21]. "
    [Show abstract] [Hide abstract]
    ABSTRACT: We have investigated the nonlinear response of the silver nanoparticle samples in a low-power regime of electromagnetic field based on nonlocal thermo-optic models. In this work, the experimental investigation of the thermo-optic nonlinear response of Ag colloids containing different size of silver nanoparticles is reported. The colloidal nanoparticle samples were synthesized by nanosecond pulsed laser ablation of Ag bulk in acetone. The sample containing Ag was characterized by linear absorption spectroscopy and transmission electron microscopy. Using the z-scan technique, the behavior of thermal nonlinear refractive index of colloid was studied at different concentrations of silver nanoparticles. Observation of asymmetrical configurations of the z-scan data indicates that nonlinear refraction occurring in the Ag samples is related to the thermo-optical process. The optical limiting here is due to nonlinear refraction of the samples arising from thermal lens formation under low-power CW excitation. When the laser power is low, the self-defocusing effect is mainly dominated by surface plasmon resonance effect. Results show that with increasing concentration of nanoparticles in acetone, the nonlinear refractive index increases while the threshold power of optical limiting decreases.
    Optik - International Journal for Light and Electron Optics 10/2014; 125(19). DOI:10.1016/j.ijleo.2014.07.066 · 0.68 Impact Factor
  • Source
    • "In recent years, researches on noble metals nanoparticles have got considerable attention in chemistry and physics [1–3] especially silver nanoparticles, which exhibit an enhancement of some potential properties including electrical conductivity [4], catalysis [5, 6], magnetic and optical polarizability [7], photonic technologies [8–11], and antimicrobial activity in surface-enhanced Raman scattering (SERS) [12]. Particle size may influence the physical properties of silver nanoparticles [13–15]. "
    [Show abstract] [Hide abstract]
    ABSTRACT: α-Keto acid of pefloxacin mesylate (PFLX) can form the complex with Terbium(III). The intramolecular energy from PFLX to Terbium(III) ion takes place when excited, and thus Terbium(III) excited state is formed and then emits the characteristic fluorescence of Terbium(III), locating at 490, 545, 580, and 620 nm. The second-order scattering (SOS) peak at 545 nm also appears for the complex with the exciting wavelength of 273 nm. When the silver nanoparticles are added to the system, the luminescence intensity at 545 nm greatly increased. So, with the adding of nanoparticles to the Terbium(III)-PFLX complex, not only is the intramolecular energy promoted but also the SOS intensity is enhanced. The experimental results show that it is the silver nanoparticles with certain size and certain concentration which can greatly enhance the fluorescence-SOS intensity, and the relative intensity at 545 nm is proportional to the amount of PFLX. Based on this phenomenon, a novel method for the determination of PFLX has been developed and applied to the determination of PFLX in capsule and serum samples.
    05/2014; 2014:742935. DOI:10.1155/2014/742935
Show more


46 Reads
Available from