Preparation and Characterization of Silver Citrate Nano-Emulsion and Nano-Silver Film

2008 ◽  
Vol 373-374 ◽  
pp. 698-701
Author(s):  
Li Xin Mo ◽  
Lu Hai Li ◽  
Ya Ling Li ◽  
Zhong Xiao Li ◽  
Ming Wang
Keyword(s):  
Thin Film ◽  
Silver Film ◽  
Particle Surface ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Visible Absorption ◽  
Nano Scale ◽  
Silver Thin Film ◽  
Uv Visible ◽  
Pet Substrate

To prepare the nano-scale silver carboxylate emulsions and investigate their applications in the preparation of nano-scale silver films, the silver citrate emulsion was synthesized through the reaction of silver nitrate with sodium citrate in the presence of polyvinylpyrrolidone (PVP) as a surface modification agent in water. The emulsion was coated onto the surface of the PET substrate to form a thin latex layer of silver citrate. And this was followed by drying at about 100 °C. Then, the silver citrate thin film was deoxidized by aqueous ascorbic acid. Finally, a translucent silver thin film was formed on the surface of the PET substrate. Properties of the silver citrate emulsion and the silver film on the PET were characterized by X-ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), laser particle size analysis, scanning electron microscopy (SEM), thermogravimetry(TG) ,UV-visible absorption spectroscopy, atomic force microscopy(AFM) and digital multimeter analysis. It was found that the silver citrate particle surface-modified by PVP has a nano-rod structure and homogeneous size distribution. The nano-rod was about 20 nm in diameter and 200 nm in length. For the UV-visible absorption spectrum of the thin film exhibited an absorption peak at 430 nm, the silver thin film prepared on the surface of the PET substrate was a typical nano-scale sliver film. Measurements of the sliver thin film at room temperature indicated that the silver film was electrically conductive, and the surface resistance was 2.42 k5/cm.

X-Ray Studies on PbS

2011 ◽  
Vol 699 ◽  
pp. 153-165
Author(s):  
M. Ambika ◽  
R. Saravanan
Keyword(s):  
Energy Gap ◽  
Visible Spectrum ◽  
Particle Size Analysis ◽  
Sem Analysis ◽  
Entropy Method ◽  
Size Analysis ◽  
Lead Sulphide ◽  
X Ray ◽  
Refinement Method ◽  
Uv Visible

In this work, lead sulphide has been characterized using X- ray diffraction, SEM, EDX and UV-Visible techniques. X-ray analysis is done by using the Rietveld refinement method of matching the observed and calculated profiles, and then the results obtained from the refinement process are used in finding the electron density distribution by using maximum entropy method (MEM). The local structure analysis of PbS is done by the pair distribution function (PDF). Particle size analysis is done with the use of XRD data, SEM analysis is done in finding the surface structure and EDX in finding the elemental composition of PbS sample. The energy gap of PbS is found from UV-Visible spectrum.

scholarly journals Effect of Saffron Extract on the Hepatotoxicity Induced by Copper Nanoparticles in Male Mice

Molecules ◽  
2021 ◽  
Vol 26 (10) ◽  
pp. 3045
Author(s):  
Azza A. Attia ◽  
Heba S. Ramdan ◽  
Rasha A. Al-Eisa ◽  
Bassant O. A. Adle Fadle ◽  
Nahla S. El-Shenawy
Keyword(s):  
Oxidative Stress ◽  
Electron Microscope ◽  
Copper Nanoparticles ◽  
Industrial Applications ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Dependent Manner ◽  
Male Mice ◽  
Visible Absorption ◽  
Saffron Extract

Background: Nanotechnology application has widespread use in many products. Copper nanoparticles (CuNPs) are widely used in industrial applications. The present study was conducted to investigate the effect of the ethanolic saffron extract (ESE) as a natural antioxidant on the hepatotoxicity induced by CuNPs in male mice. Methods: The characterization of CuNPs was determined using ultraviolet–visible absorption spectroscopy, particle size analysis, zeta potential, Fourier-transform infrared spectroscopy, and electron microscope. The effect of saffron on the hepatotoxicity induced by CuNPs in mice was evaluated by evaluating the survival rate of the mice, oxidative stress, antioxidant capacity, DNA evaluation, as well as its effect on the histology and transmission electron microscope of the liver. Results: The results revealed that all parameters were affected in a dose-dependent manner by CuNPs. These effects have been improved when the treatment of CuNPs is combined with ethanolic saffron extract. Conclusions: We can conclude that saffron and its bioactive crocin portion can prevent CuNP-induced oxidative liver damage. This substance should be useful as a new pharmacological tool for oxidative stress prevention.

Particle size, water-stable aggregates, and bacterial populations in lake sediments

1971 ◽  
Vol 17 (2) ◽  
pp. 217-227 ◽  
Author(s):  
D. Tsernoglou ◽  
E. H. Anthony
Keyword(s):  
Particle Size ◽  
Bacterial Population ◽  
Particle Surface ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Sediment Particle ◽  
Bacterial Populations ◽  
Water Stable Aggregates ◽  
Before And After ◽  
Direct Counts

Sediments from 10 lakes for which bacterial counts were available were submitted to particle size analysis (Coulter Counter), both before and after removal of organic material. While these sediments were not so highly aggregated as soils, they contained water-stable aggregates and differed from one another in this characteristic. The counter failed to detect some apparently unstable aggregations visible in the sediment of one lake. The median sizes of the untreated sediment were observed to be inversely proportional to the median sizes of the sediment from which the organic component had been removed. There was good correlation between logarithms of the heterotrophic bacterial population (culture counts) and the median sizes of the particles in untreated samples of the sediment. Estimations of bacterial density, assuming a specific gravity of 1.6 for these sediments indicated that, for the four lakes for which direct counts of bacteria were available, there were from 3000 to 15 000 bacteria per square millimeter of sediment particle surface, or about 1 bacterium for every 70 to 300 μ2.

A Heat Sensitive Color-Developing Nanocapsule as Leucocompound Delivery Carrier

2013 ◽  
Vol 643 ◽  
pp. 166-169
Author(s):  
Pu Ying An ◽  
Zhao Yun Yu ◽  
Shuang Lu
Keyword(s):  
Particle Size ◽  
Smooth Surface ◽  
Particle Size Analysis ◽  
Size Analysis ◽  
Particle Sizes ◽  
Mass Ratio ◽  
The Core ◽  
Uv Visible ◽  
Wall Mass ◽  
Scanning Electron

A heat sensitive color-developing nanocapsule as leucocompound delivery carrier was prepared by emulsion polymerization. The nanocapsules were characterized by Malvern particle size analysis, scanning electron microscopy (SEM) and UV/visible spectrophotometer. The heat sensitive color-developing curves of absorbency at different temperature were investigated. The effects of core/wall mass ratio on the heat sensitive color-developing properties of nanocapsules were discussed in detail. The particle size analysis demonstrates that the particle sizes mostly concentrate between 124 nm and 312 nm. SEM result shows that the nanocapsules have smooth surface. The resultant nanocapsules have the highest heat sensitive color-developing absorbency with the the core/wall mass ratio being 1:8.

scholarly journals Non-perpendicular incidence angle of cold atmospheric-pressure plasma treatment for fabrication of silver-based surface plasmon resonance biosensor for detection of Escherichia coli in water

2021 ◽  
Author(s):  
Maryam Hosseinpour ◽  
Akbar Zendehnam ◽  
Seyedeh Mehri Hamidi Sangdehi ◽  
Hamidreza Ghomi Marzdashti
Keyword(s):  
Thin Film ◽  
Escherichia Coli ◽  
Glass Substrate ◽  
Silver Film ◽  
Incidence Angle ◽  
Film Surface ◽  
Distilled Water ◽  
Spr Biosensor ◽  
Silver Thin Film ◽  
Perpendicular Incidence

Abstract In this study, for the first time, to our knowledge, a biosensor was produced using cold atmospheric plasma (CAP) treatment of silver thin film surface with non-perpendicular incidence angle for identification of Escherichia coli in the distilled water. Field emission scanning electron microscopy (FESEM) exhibits that before deposition, non-perpendicular CAP treatment of glass surface substrate leads to the production of pinhole-free silver thin film. The results of atomic force microscopy (AFM), and curve fitting show that non-perpendicular CAP treatment of this pinhole-free silver thin film indicates to the appearance of Ag NPs with smaller size and larger surface area compared to untreated silver film deposited on the untreated glass substrate. The silver-based pinhole-free SPR biosensor produced with non-perpendicular CAP treatment of both glass substrate and silver film shows E. coli detection in the distilled water in the range of 104 Colony forming unit (CFU/ml) to 108 CFU/ml with better sensitivity compared to the untreated silver-based SPR biosensor.

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