Emerging investigator series: quantifying silver nanoparticle aggregation kinetics in real-time using particle impact voltammetry coupled with UV-vis spectroscopy

2020 ◽  
Vol 7 (9) ◽  
pp. 2509-2521
Author(s):  
Laela Ezra ◽  
Zachary J. O'Dell ◽  
Janan Hui ◽  
Kathryn R. Riley
Keyword(s):  
Silver Nanoparticles ◽  
Real Time ◽  
Silver Nanoparticle ◽  
Particle Impact ◽  
Aggregation Kinetics ◽  
Nanoparticle Aggregation ◽  
Analytical Technique ◽  
Single Nanoparticle ◽  
Vis Spectroscopy

This work describes the development of an analytical technique that couples single nanoparticle electrochemistry and UV-vis spectroscopy to determine aggregation kinetics and critical coagulation concentrations (CCCs) of silver nanoparticles.

scholarly journals Phytochemical Synthesis and Preliminary Characterization of Silver Nanoparticles Using Hesperidin

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Anish Stephen ◽  
Sankar Seethalakshmi
Keyword(s):  
Electron Microscopy ◽  
Aqueous Solution ◽  
Transmission Electron Microscopy ◽  
Silver Nanoparticles ◽  
Reaction Time ◽  
Silver Nanoparticle ◽  
Size Range ◽  
Transmission Electron ◽  
Vis Spectroscopy

This paper is the first of its kind for development of rapid and ecofriendly method for synthesis of silver nanoparticles from aqueous solution of silver nitrate using the flavonoid “hesperidin” and optimization of the methodology. There is formation of stable spherical silver nanoparticles in the size range of 20–40 nm. Optimization of methodology in terms of concentration of reactants and pH of the reaction mixture reduced the reaction time for silver nanoparticle formation to 2 mins. Silver nanoparticles (AgNPs) were characterized by UV-Vis spectroscopy and transmission electron microscopy (TEM). UV-vis spectroscopy derived spectrum demonstrated a peak of 430 nm which corresponds to the plasmon absorbance of silver nanoparticles. Transmission electron microscopy revealed spherical shaped silver nanoparticles in the size range of 20–40 nm.

Size Effect of Silver Nanoparticle Melted into ZnO Nanorods for Photocatalytic Activity

2013 ◽  
Vol 284-287 ◽  
pp. 367-374
Author(s):  
Jung Jie Huang ◽  
Ching Hsun Chao ◽  
Chao Nan Chen ◽  
Chun Fa Hsu ◽  
Ming Wei Tsai
Keyword(s):  
Electron Microscopy ◽  
Methylene Blue ◽  
Silver Nanoparticles ◽  
Photocatalytic Activity ◽  
Size Effect ◽  
Silver Nanoparticle ◽  
Uv Light ◽  
Zno Nanorods ◽  
Zno Nanorod ◽  
Vis Spectroscopy

Ag/ZnO nanorod structure was synthesized by using the hydrothermal method to grow ZnO nanorods and melted silver nonoparticles into ZnO nanorods by thermal annealing process in vacuum at 700 oC. The photocatalytic activity for methylene blue decolorization is enhanced by silver nanoparticles melted into a ZnO nanorod structure owing to the formation of Schottky barrier near the Ag/ZnO interface prolongs the recombination of electron-hole pairs effectively. The size effect of silver nanoparticles in the Ag/ZnO nanorod structure for photocatalytic activity was discussed which was changed from 12 to 34 nm. The smaller silver nanoparticle size sample shows better decolorization efficiency of methylene blue solution owing to the higher surface area of Ag/ZnO nanoroad. Ag/ZnO nanorod films have been characterized by X-ray diffraction (XRD), UV-vis spectroscopy, field-emission scanning electron microscopy (FE-SEM) and transmission electron microscopy (TEM). The dye decolorization significantly increased from 69 to 99 % after UV light irradiation for 8 hr by the optimum Ag/ZnO nanorod film.

scholarly journals Protein corona-induced modification of silver nanoparticle aggregation in simulated gastric fluid

2016 ◽  
Vol 3 (6) ◽  
pp. 1510-1520 ◽  
Author(s):  
Andrew P. Ault ◽  
Diana I. Stark ◽  
Jessica L. Axson ◽  
Justin N. Keeney ◽  
Andrew D. Maynard ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Silver Nanoparticle ◽  
Protein Corona ◽  
Gastric Fluid ◽  
Simulated Gastric Fluid ◽  
Nanoparticle Aggregation

This works shows enhanced aggregation of silver nanoparticles in simulated gastric fluid when pepsin protein is present.

scholarly journals Biological Activities and Characterization of Silver Nanoparticles from Prunus Prescia (L.) Batsch

2021 ◽  
Vol 10 (3) ◽  
pp. 2466-2482
Keyword(s):  
Silver Nanoparticles ◽  
Silver Nanoparticle ◽  
Leaf Extract ◽  
Prunus Persica ◽  
Color Change ◽  
Biological Activities ◽  
Radical Scavenging ◽  
Face Centered Cubic ◽  
Plasmon Band ◽  
Vis Spectroscopy

In this paper, Prunus persica L. Batsch (wild and variety) plants have been used for the bioreduction of silver ions to silver nanoparticles. Aqueous leaf extract of plants was treated with silver nitrate. The mixture's color changed from pale yellow to dark brown Prunus persica (variety) and dark yellow to greyish brown Prunus persica (wild). The color change was the first indication of silver nanoparticle synthesis, further confirmed by UV-Vis spectroscopy. The surface Plasmon band exhibited absorption peaks for Prunus persica wild and variety leaf extract at 468 nm, 492 nm, 462 nm. The silver nanoparticles were further characterized using X-Ray Diffraction that carried out the crystallographic nature by exhibiting 2θ value from 10˚ to 90˚ corresponding diffraction planes of Face Centered Cubic structure. Fourier Transform Infrared spectroscopy demonstrated organic compounds in plant material that mainly involved in reduction. Prunus persica L. Batsch (wild and variety) mediated silver nanoparticles exhibited excellent antibacterial activity against a human bacterial pathogen. The antioxidant activity was also studied that showed effective results on synthesized silver nanoparticles using the 1, 1-Diphenyl-2-picrylhydrazyl (DPPH) radical scavenging assay. The result showed that Prunus persica L. Batsch proved to be a useful silver nanoparticle.

scholarly journals Bacterial Cellulose From Rice Waste Water With Addition Chitosan, Glycerol, And Silver Nanoparticle

Molekul ◽  
2016 ◽  
Vol 11 (1) ◽  
pp. 9
Author(s):  
Eli Rohaeti ◽  
Endang WLFX ◽  
Anna Rakhmawati
Keyword(s):  
Waste Water ◽  
Particle Size ◽  
Silver Nanoparticles ◽  
Bacterial Cellulose ◽  
Silver Nanoparticle ◽  
Nitrate Solution ◽  
Glycerol Solution ◽  
Antibacterial Test ◽  
E Coli ◽  
Vis Spectroscopy

This study aimed to prepare silver nanoparticles chemically, deposite silver nanoparticles on bacterial cellulose-chitosan-glycerol composite based rice waste water, as well as test the antibacterial activity of bacterial cellulose and its composite. Preparation of silver nanoparticles was conducted by chemical reduction of silver nitrate solution, as well as trisodium citrate as the reductor. Bacterial cellulose from rice waste water is fermented by the bacteria Acetobacter xylinum for 7 days. The dried bacterial cellulose was composited with chitosan and glycerol by immersion method on 2% of chitosan solution and 0.5% of glycerol solution. UV-Vis spectroscopy is used to determine the formation of silvernanoparticles and Particle Size Analyzer to test the size and particle size distribution. Characterization was conducted to bacterial cellulose and its composite included functional groups by FTIR, the mechanical properties by Tensile Tester, crystallinity by XRD, surface photograph by SEM, and antibacterial test against S. aureus and E. coli by the shake flask turbidimetry method. Silver nanoparticle characterization indicated that silver nanoparticles are formed at a wavelength of 421.80 nm, yellow, diameter particle size of 61.8 nm. SEM images showed that the surface of bacterial cellulose had deposited silver nanoparticles and antibacterial test showed an inhibitory effect of bacterial cellulose, bacterial cellulose-chitosan composite, and bacterial cellulose-chitosan-glycerol composite which are deposited silver nanoparticles against the growth of S. aureus and E. coli bacteria.

Adsorbate-Induced Silver Nanoparticle Aggregation Kinetics

2005 ◽  
Vol 109 (31) ◽  
pp. 14755-14758 ◽  
Author(s):  
Martin Moskovits ◽  
Blanka Vlčková
Keyword(s):  
Silver Nanoparticle ◽  
Aggregation Kinetics ◽  
Nanoparticle Aggregation

Detection of intracellular silver nanoparticles using flow cytometry

2018 ◽  
pp. 223-226
Author(s):  
С.И. Каба ◽  
А.А. Соколовская
Keyword(s):  
Flow Cytometry ◽  
Silver Nanoparticles ◽  
Endothelial Cells ◽  
Silver Nanoparticle ◽  
Cell Uptake ◽  
Control Samples

Продемонстрировано обнаружение наночастиц серебра во внутриклеточном пространстве с помощью проточной цитофлуориметрии. В эндотелиальных клетках линии EA.hy926, инкубированных в растворе, содержащем 2 мкг/мл наносеребра, измеряли боковое светорассеяние. По сравнению с контрольными образцами этот параметр возрастал, в то время как прочие значимые характеристики не изменялись. Это подтверждает чувствительность метода к изменившемуся состоянию клеток и указывает на поглощение наночастиц серебра клетками при концентрации ниже токсической. The study demonstrated a possibility for detection of intracellular silver nanoparticles using flow cytometry. The parameter used in this work, side scattering, was measured in EA.hy926 endothelial cells incubated in a 2 mg/ml silver nanoparticle solution. This parameter was increased compared to control samples. Therefore, this technique was sensitive to changes in the cell status and suggested the cell uptake of the particles under the subtoxic conditions.

scholarly journals Silver Nanoparticles Functionalized by Fluorescein Isothiocyanate or Rhodamine B Isothiocyanate: Fluorescent and Plasmonic Materials

2021 ◽  
Vol 11 (6) ◽  
pp. 2472
Author(s):  
Ilaria Fratoddi ◽  
Chiara Battocchio ◽  
Giovanna Iucci ◽  
Daniele Catone ◽  
Antonella Cartoni ◽  
...  
Keyword(s):  
Silver Nanoparticles ◽  
Rhodamine B ◽  
Photoelectron Spectroscopy ◽  
Transient Absorption ◽  
Fluorescein Isothiocyanate ◽  
Dye Molecules ◽  
Chemical Surface ◽  
Vis Spectroscopy ◽  
Rhodamine B Isothiocyanate ◽  
Fluorescent Molecules

This paper presents the synthesis of silver nanoparticles (AgNPs) functionalized with fluorescent molecules, in particular with xanthene-based dyes, i.e., fluorescein isothiocyanate (FITC, λmax = 485 nm) and rhodamine B isothiocyanate (RITC, λmax = 555 nm). An in-depth characterization of the particle–dye systems, i.e., AgNPs–RITC and AgNPs–FITC, is presented to evaluate their chemical structure and optical properties due to the interaction between their plasmonic and absorption properties. UV–Vis spectroscopy and the dynamic light scattering (DLS) measurements confirmed the nanosize of the AgNPs–RITC and AgNPs–FITC. Synchrotron radiation X-ray photoelectron spectroscopy (SR-XPS) was used to study the chemical surface functionalization by structural characterization, confirming/examining the isothiocyanate–metal interaction. For AgNPs–RITC, in which the plasmonic and fluorescence peak are not superimposed, the transient dynamics of the dye fluorescence were also studied. Transient absorption measurements showed that by exciting the AgNPs–RITC sample at a wavelength corresponding to the AgNP plasmon resonance, it was possible to preferentially excite the RITC dye molecules attached to the surface of the NPs with respect to the free dye molecules in the solution. These results demonstrate how, by combining plasmonics and fluorescence, these AgNPs can be used as promising systems in biosensing and imaging applications.

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