Novel characterization of nanosilver fluid through ultrasonic studies supported by UV–Vis spectroscopy, DLS and TEM studies

Flower, G. Little; Latha, S.; Rao, K. Venkateswara

doi:10.1016/j.molliq.2016.06.017

Cited by 22 publications

(12 citation statements)

References 27 publications

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“…The average crystallite size was calculated as ~48.3 nm for NCS and ~62.8 nm for CCS using Debye Scherrer's equation. Figure shows the particle size distribution by dynamic light scattering obtained from HORIBA‐SZ‐100 particle size analyser . The average particle size of NCS ceramics was obtained as ~42.4 and ~55.4 nm for CCS ceramics.…”

Section: Resultsmentioning

confidence: 99%

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A comparative study on in vitro behavior of calcium silicate ceramics synthesized from biowaste resources

et al. 2019

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Calcium silicate ceramics have received significant attention for biomedical applications for their excellent bioactivity and osteoconduction properties. Sol‐gel process is extensively used for the fabrication of calcium silicates. In sol‐gel process, calcium nitrate tetra hydrate (Ca(NO3)2·4H2O) and tetraethylorthosilicate (TEOS) are used as precursors. However, these precursors are expensive. The objective of this work was to compare in vitro behavior of calcium silicate (CaSiO3) produced using biowaste such as rice husk ash (RHA) and eggshells (coded; NCS) with CaSiO3 prepared using TEOS and Ca(NO3)2·4H2O (coded; CCS). Thermal investigation results revealed that the crystallization temperature for NCS is relatively lower (772°C) than for CCS (870°C). Bioactivity was studied in vitro using simulated body fluid (SBF) with respect to mineralization rate of hydroxyapatite. Mineralization of a greater hydroxyapatite was observed on NCS ceramics than CCS ceramics after incubation for 3, 7, 14 days in SBF solution, which was confirmed using X‐ray diffractometer, Fourier transform infrared spectroscopy, scanning electron microscopy‐energy dispersive spectroscopy. Degradation studies were conducted in Tris‐HCl solution and the test results revealed that NCS ceramics has lower dissolution rate than CCS ceramics. The antimicrobial assay has shown that NCS samples exhibit significant zone of inhibition against Escherichia coli and Staphylococcus aureus which confirmed that the CaSiO3 prepared from RHA and eggshell can prevent bacteria from adhering to the surface. In addition cell culture studies revealed that NCS ceramics possess good cytocompatibility with MG‐63 cells and significantly promoted cell proliferation.

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Section: Resultsmentioning

confidence: 99%

“…Figure 3 shows the particle size distribution by dynamic light scattering obtained from HORIBA-SZ-100 particle size analyser. 29 The average particle size of NCS ceramics was obtained as ~42.4 and ~55.4 nm for CCS ceramics. These results are in close agreement with the crystallite size obtained from the XRD patterns.…”

Section: Structural Characterizationmentioning

confidence: 96%

A comparative study on in vitro behavior of calcium silicate ceramics synthesized from biowaste resources

et al. 2019

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“…Two absorption peaks in the ultraviolet region can be observed at ~302 and ~342 nm, although no clear trend with the sonication time or amount of CeO 2 nanostructures is obtained. The absorption peaks could be related to the charge transfer (2p O → 4f Ce) absorption edge of CeO 2 , which filled the well-known f to f spin-orbit splitting of the Ce 4f state [60,61], although some contributions from water base polyurethane were due to wavelengths shorter than 380 nm, where the π–π* (~300 nm) and n–π* (~330 nm) cannot discarded. The absorption values were also characterized by a strong reduction starting at a wavelength of 370 nm that extends up to the visible region.…”

Section: Resultsmentioning

confidence: 98%

Intensification of Electrochemical Performance of AA7075 Aluminum Alloys Using Rare Earth Functionalized Water-Based Polymer Coatings

et al. 2017

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This work reports the effect of different amounts of ceria nanoparticles on UV resistance and barrier properties of water-based polyurethane (WPU) on glass and AA7075 aluminum alloy substrates. Hybrid coatings were synthesized from an aliphatic WPU–HDI (1,6-hexamethylene di-isocyanate) and cerium oxide nanoparticles (CeO2) with an average particle size distribution of about 25 nm. Different nanoceria amounts (1, 3 and 5 wt %), mixing times (30, 60 and 120 min) and methods to disperse the nanostructures into the polymer matrix (magnetic stirring and sonication) were evaluated. Initially, the dispersion of CeO2 nanoparticles embedded in the polymer matrix and displacement in the corrosion potential (Ecorr) were analyzed by confocal scanning laser microscopy (CLSM) and open circuit potential (Eocp) measurements. According to this behavior, the dispersion and water ratio required during the polymerization process were established. Coated samples obtained after the second stage were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), atomic force microscopy (AFM) and optical light microscopy. In addition, optical measurements on glass substrates were evaluated with UV-vis spectroscopy. The effect of the synthesis parameters on the corrosion behavior of WPU–CeO2/AA7075 systems was investigated with Eocp and electrochemical impedance spectroscopy (EIS) in a 3 wt % NaCl solution. In addition, the films were subjected to 180 h of accelerated weathering. The results show that the combination of specific nanoceria addition with the optimal synthesis parameters enhances optical transparence of WPU as well as barrier properties. From these, the coated specimens prepared with 3 wt % of ceria content and sonicated for 30 min showed a highly dispersed system, which results in a high charge transfer resistance. The observed properties in clear coats deposited on metallic substrates suggested an improvement in the appearance and less deterioration in UV exposure in comparison with pure WPU, enhancing the protective properties of the AA7075 aluminum alloy when exposed to a corrosive medium.

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“…Hence the diameter results obtained from the TEM analysis are smaller compared to the diameter obtained by the DLS method. The UV-Vis absorption spectra of these nanosilver colloids revealed a high intense plasmon absorption peak near 415 nm, what is characteristic for silver nanoparticles [18,19]. The changes of position and shape of the absorption spectrum of the nanoparticles were not…”

Section: Multidimensional Control Chartsmentioning

confidence: 91%

“…The multidimensional Hotelling T 2 control charts were based on the UV-Vis analysis. The wavelength range (404-416 nm) was chosen based on the characteristics of the absorption band of nanoparticles associated with the presence of surface plasmons and for silver nanoparticles in the range of 400-440 nm [18,19].…”

Section: The Control Chartsmentioning

confidence: 99%

Continuous Production of Silver Nanoparticles and Process Control

Długosz

Banach

2019

J Clust Sci

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The purpose of this research was to prepare silver nanoparticles in a tubular reactor using tannic acid as both a reducing agent and a stabiliser. The stability of the process was determined using statistical analysis with control charts. The qualitative analysis of the resulting colloidal silver nanoparticles was investigated using UV-Vis spectroscopy, dynamic light scattering method and the transmission electron microscopy. Particles with average sizes ranging from 14 to 60 nm were obtained. Stability of the process was achieved mainly through the use of 0.5 Tannic acid/AgNO 3 molar ratios and temperature ranging from 20 to 45°C. The proposed technique is consistent with the principles of green chemistry and can be an alternative for traditional nanosilver synthesis.

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Novel characterization of nanosilver fluid through ultrasonic studies supported by UV–Vis spectroscopy, DLS and TEM studies

Cited by 22 publications

References 27 publications

A comparative study on in vitro behavior of calcium silicate ceramics synthesized from biowaste resources

A comparative study on in vitro behavior of calcium silicate ceramics synthesized from biowaste resources

Intensification of Electrochemical Performance of AA7075 Aluminum Alloys Using Rare Earth Functionalized Water-Based Polymer Coatings

Continuous Production of Silver Nanoparticles and Process Control

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