Preparation of silver nanoparticles using chitosan suspensions

Twu, Yawo-Kuo; Chen, Yu-Wan; Shih, Chao‐Ming

doi:10.1016/j.powtec.2007.10.025

Cited by 134 publications

(86 citation statements)

References 36 publications

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“…2a, b) shows the presence of elemental silver and gold in the freeze-dried powder. These results agree with other studies on Ag and Au NPs preparation using biomaterial such as plant extracts and microorganisms reported by Shahverdi et al [14]; Song and Kim [15]; Twu et al [16]. The XRD patterns recorded for Au and Ag NPs show six intense peaks for silver and eight intense peaks for gold over the whole spectrum of 2h, with values ranging from 10 to 90 (Fig.…”

Section: Syntheses Characterizations and Morphology Of Ag And Au Nansupporting

confidence: 91%

“…Intense peaks of 111, 200, 220, and 311 nanoparticles were observed, indexed as the crystalline silver and gold face-centered cubic phase. The intensity of the Bragg reflections suggests that there are strong X-ray scattering centers in the crystalline phase that could possibly arise from inorganic compounds present in the nanoparticles during synthesis [16,17]. Further, the morphologies and sizes of the nanoparticles were determined with the help of TEM.…”

Section: Syntheses Characterizations and Morphology Of Ag And Au Nanmentioning

confidence: 99%

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Synthesis of Silver and Gold Nanoparticles Using Cashew Nut Shell Liquid and Its Antibacterial Activity Against Fish Pathogens

et al. 2013

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This study reveals a green process for the production of multi-morphological silver (Ag NPs) and gold (Au NPs) nanoparticles, synthesized using an agroindustrial residue cashew nut shell liquid. Aqueous solutions of Ag ? ions for silver and chloroaurate ions for gold were treated with cashew nut shell extract for the formation of Ag and Au NPs. The nano metallic dispersions were characterized by measuring the surface plasmon absorbance at 440 and 546 nm for Ag and Au NPs. Transmission electron microscopy showed the formation of nanoparticles in the range of 5-20 nm for silver and gold with assorted morphologies such as round, triangular, spherical and irregular. Scanning electron microscopy with energy dispersive spectroscopy and X-ray diffraction analyses of the freeze-dried powder confirmed the formation of metallic Ag and Au NPs in crystalline form. Further analysis by Fourier transform infrared spectroscopy provided evidence for the presence of various biomolecules, which might be responsible for the reduction of silver and gold ions. The obtained Ag and Au NPs had significant antibacterial activity, minimum inhibitory concentration and minimum bactericidal concentration on bacteria associated with fish diseases.

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Section: Syntheses Characterizations and Morphology Of Ag And Au Nansupporting

confidence: 91%

Section: Syntheses Characterizations and Morphology Of Ag And Au Nanmentioning

confidence: 99%

Synthesis of Silver and Gold Nanoparticles Using Cashew Nut Shell Liquid and Its Antibacterial Activity Against Fish Pathogens

et al. 2013

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“…The PVP-Ag nanocomposite spectra of all samples exhibited a single characteristic surface plasmon resonance (SPR) absorption band around 410 nm which indicates the formation of AgNPs. The appearance of a single absorption band in the range 400-450 nm suggests that the AgNPs is formed in spherical shape [34][35][36][37]. It also can be noticed that the intensity of SPR band of AgNPs increases with increasing the volume of AgNO 3 solution (Fig.…”

Section: Ultraviolet-visible Spectroscopymentioning

confidence: 86%

Assessment of in situ-Prepared Polyvinylpyrrolidone-Silver Nanocomposite for Antimicrobial Applications

et al. 2017

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Polyvinylpyrrolidone (PVP) is employed in several potential applications, relying of its special chemical and physical properties in addition to its low toxicity and biocompatibility. The aim of this work is to prepare polyvinylpyrrolidone-silver (PVP-Ag) nanocomposite with high inhibiting effect on the microbial growth and low cytotoxicity. In situ prepared small stable spherical silver nanoparticles, with narrow range particle size distribution, were obtained by easy, economical and rapid chemical reduction method. Silver ions were reduced to silver nanoparticles using low amount of sodium borohydride (NaBH4) as a strong reducing agent. PVP-Ag nanocomposite was prepared using PVP as a stabilizing and capping agent. Formation of the spherical silver nanoparticles with mean particle size 5 nm was confirmed by ultraviolet-visible spectroscopy, high resolution transmission electron microscopy, and dynamic light scattering. The inhibiting growth effect of the nanocomposite toward Gram-positive bacteria (Staphylococcus aureus), Gram-negative bacteria (Pseudomonas aeruginosa), and yeast fungus (Candida albicans) were studied. The cytotoxicity of the nanocomposite against BJ1 normal skin fibroblast cell line was tested. Results of this work presented perfect antimicrobial activity of the PVP-Ag nanocomposite towards bacteria and fungi with low cytotoxicity, which may lead to promising applications in skin wound healing.

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“…Ag-NPs possess many interesting and unique properties. It is found in various applications, such as catalysis, electronics, non-linear optics, antimicrobial and biomaterial applications [8] . Several methods have been reported for the synthesis of Ag-NPs, e.g., photochemical reduction [9] , microwave [10] , chemical reduction [11] , γ-irradiation [12] .…”

Section: Duementioning

confidence: 99%

Synthesis and Characterization of Silver/Clay/Chitosan Bionanocomposites by UV-Irradiation Method

Ahmad

Shameli

Darroudi

et al. 2009

American Journal of Applied Sciences

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Problem statement: Silver/Montmorillonite/Chitosan Bionanocomposites (Ag/MMT/Cts BNCs) have been synthesized by UV-irradiation reduction method in the absence of any reducing agent or heat treatment which is used to antibacterial application and medical devices. Approach: MMT, Chitosan and AgNO 3 were used as a solid support, stabilizer and silver precursor, respectively. The properties of Ag/MMT/Cts BNCs were studied as a function of UV-irradiation times. The crystalline structure, d-spacing of interlayer of MMT, the size distributions and surface plasmon resonance of synthesized silver nanoparticles (Ag-NPs) were characterized using Powder X-Ray Diffraction (PXRD), Transmission Electron Microscopy (TEM) and UV-vis spectroscopy. The functional groups of prepared BNCs were also determined by Fourier Transform Infrared (FT-IR). Results: The results obtained from UV-vis spectroscopy of synthesized Ag-NPs showed that the intensity of the maximum wavelength of the plasmon peaks were increased with the increasing in the UV-irradiation times. Results from UV-visible spectroscopy and Transmission Electron Microscopy (TEM) microphotographs show that particles size of Ag-NPs decrease with the increase of UV-irradiation time. Conclusion: UV-irradiation disintegrated the Ag-NPs into smaller size until a relatively stable size and size distribution were achieved. Ag/MMT/Cts BNCs could be suitable to antimicrobial applications and medical devices.

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Preparation of silver nanoparticles using chitosan suspensions

Cited by 134 publications

References 36 publications

Synthesis of Silver and Gold Nanoparticles Using Cashew Nut Shell Liquid and Its Antibacterial Activity Against Fish Pathogens

Synthesis of Silver and Gold Nanoparticles Using Cashew Nut Shell Liquid and Its Antibacterial Activity Against Fish Pathogens

Assessment of in situ-Prepared Polyvinylpyrrolidone-Silver Nanocomposite for Antimicrobial Applications

Synthesis and Characterization of Silver/Clay/Chitosan Bionanocomposites by UV-Irradiation Method

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