scholarly journals Optical Nonlinear Properties of Gold Nanoparticles Synthesized by Laser Ablation in Polymer Solution

2017 ◽  
Vol 2017 ◽  
pp. 1-9 ◽  
Author(s):  
M. Tajdidzadeh ◽  
A. B. Zakaria ◽  
Z. Abidin Talib ◽  
A. S. Gene ◽  
S. Shirzadi
Keyword(s):  
Particle Size ◽  
Gold Nanoparticles ◽  
Polyethylene Glycol ◽  
Laser Ablation ◽  
Volume Fraction ◽  
Chitosan Solution ◽  
The Other ◽  
Distilled Water ◽  
Nonlinear Properties ◽  
Glycol Solution

In the present study, gold nanoparticles were synthesized in various polymer solutions by means of employing laser ablation technique at the same ablation time. Specifically, gold nanoparticles were synthesized in polyethylene glycol and chitosan solutions, in order to compare the effects of the liquid media which served as stabilizers for particle size and volume fraction of nanoparticles. In addition, this experiment was repeated in distilled water for reference purposes. As the findings indicated, the particle size which was obtained in polyethylene glycol was about 7.49 nm, that is, smaller than those of chitosan solution and distilled water, respectively. In contrast, it was observed that the volume fraction of gold nanoparticles increased in polyethylene glycol in comparison with the other media which indicated an effect on the formation of NPs. On the other hand,Z-scan technique was employed to measure the nonlinear refractive index and nonlinear absorption coefficient of nanofluids containing gold nanoparticles. Consequently, the nonlinear properties of nanofluids pointed to a significant contribution with the number of nanoparticles observed in fluids and both optical nonlinear parameters were observed to increase by means of a prior increase in the volume fraction of Au-NPs in polyethylene glycol solution.

SINTESIS DAN KARAKTERISASI NANOPARTIKEL KITOSAN – EKSTRAK KULIT BUAH MANGGIS (Garcinia Mangostana)

2013 ◽  
Vol 14 (3) ◽  
Author(s):  
Eriawan Rismana ◽  
Susi Kusumaningrum ◽  
Olivia Bunga P ◽  
Idah Rosidah ◽  
Marhamah Marhamah
Keyword(s):  
Particle Size ◽  
Sodium Tripolyphosphate ◽  
Chitosan Solution ◽  
The Other ◽  
Ionic Gelation ◽  
Garcinia Mangostana ◽  
Particle Size Analyzer ◽  
Cadmium Lead ◽  
Solvent Residue ◽  
Mold And Yeast

The chitosan – Garcinia Mangostana extract nanoparticles has been prepared by ionic gelation reaction by mixture 0.2 % chitosan solution in acetic acid with Garcinia Mangostana extract and it’s continued by reaction process with 0.1 % sodium tripolyphosphate. The particle size of material was determined by Particle Size Analyzer (PSA) that it showed in the range of 200 – 500 nm. The color, pH, water, α- mangostin, mercury, arsenic, cadmium, lead, totally microbe aerobic, totally mold and yeast, and solvent residue contents of nanoparticles were also examined by many methods that these resulted are yellow, 4.50 – 5.50, 89 – 90 %, 1.05 %, < 0.005 ppm, < 0.01 ppm, < 0.01 ppm, < 0.05 ppm, < 10 CFU/g, < 10 CFU/g and not detected, respectively. The other characterization was also observed that it’sincluded stability andTLC chromatogram. A mixture of nanoparticles with cosmetics bases was showed that it’s increased stability, homogeneity and easy to formed.

scholarly journals SYNTHESIS AND STABILITY OF RESVERATROL-CONJUGATED GOLD NANOPARTICLES MODIFIED WITH POLYETHYLENE GLYCOL

2020 ◽  
pp. 230-236
Author(s):  
RADITYA ISWANDANA ◽  
RICHA NURSELVIANA ◽  
SUTRIYO SUTRIYO
Keyword(s):  
Particle Size ◽  
Gold Nanoparticles ◽  
Polyethylene Glycol ◽  
Zeta Potential ◽  
High Performance ◽  
Entrapment Efficiency ◽  
Test Results ◽  
Novel Method ◽  
The Stability ◽  
Phosphate Buffered Saline

Objective: Gold nanoparticles (AuNPs) are highly useful for drug delivery, but their application is limited by their stability as they readily aggregate.This issue can be prevented by adding a stabilizing agent such as resveratrol (RSV), which is a polyphenol derived from plants, that is used to preventcancer. Therefore, we propose a novel method to prepare stable RSV-conjugated nanoparticles modified with polyethylene glycol (RSV-AuNP-PEG).Methods: In the first step, the Turkevich method was used to synthesize the AuNPs. Then, PEG was added as stabilizer agent and conjugated with RSV.The synthesized conjugates were characterized using ultraviolet-visible spectrophotometry, Fourier transform infrared spectroscopy, particle sizeanalysis, and high-performance liquid chromatography.Results: The obtained RSV-AuNP-PEG had a particle size of 83.93 nm with a polydispersity index (PDI) of 0.562 and formed a translucent purple-redfluid in solution. The zeta potential was −22.9 mV, and the highest entrapment efficiency was 75.86±0.66%. For comparison, the RSV-AuNP solutionwas purple and turbid, the particle size was 51.97 nm with a PDI of 0.694, and the zeta potential was −24.6 mV. The stability test results showed thatthe storage stability of RSV-AuNP-PEG was better than that of AuNP-RSV. Further, the RSV-AuNP-PEG was shown to be most stable in 2% bovine serumalbumin (BSA) while the AuNP-RSV was most stable in 2% BSA in phosphate-buffered saline pH 7.4.Conclusion: These results show that modification of RSV-conjugated AuNPs with PEG effectively prevents their aggregation in storage, but only incertain mediums.

scholarly journals An imine-based approach to prepare amine-functionalized Janus gold nanoparticles

2015 ◽  
Vol 51 (58) ◽  
pp. 11622-11625 ◽  
Author(s):  
Shaojue Wu ◽  
Si Yu Tan ◽  
Chung Yen Ang ◽  
Kim Truc Nguyen ◽  
Menghuan Li ◽  
...  
Keyword(s):  
Gold Nanoparticles ◽  
Polyethylene Glycol ◽  
The Other ◽  
Amine Functionalized

An imine-based approach was developed to prepare Janus gold nanoparticles having amine functionality on one patch of the surface and a polyethylene glycol unit on the other.

scholarly journals Physiological quality of osmoprimed Eremanthus erythropappus (D.C.) MacLeish seeds

2020 ◽  
Vol 13 (5) ◽  
pp. 18
Author(s):  
A. M. S. Oliveira ◽  
A. A. Silva ◽  
M. C. Vasconcelos ◽  
J. A. A. Granja ◽  
J. M. R. Faria ◽  
...  
Keyword(s):  
Polyethylene Glycol ◽  
Germination Rate ◽  
Seed Priming ◽  
Potassium Nitrate ◽  
The Other ◽  
Other Substances ◽  
Physiological Quality ◽  
Glycol Solution ◽  
Polyethylene Glycol 6000

Physiological conditioning is a technique that consists in controlling the speed of water uptake by seeds, with osmotic solutions, aiming to improve their quality, reducing time and increasing germination rate. Eremanthus erythropappus (D.C.) MacLeish seeds were subjected to priming with polyethylene glycol 6000 (PEG), potassium nitrate (KNO3) and the combination of the two at the concentrations of 0.4; -0.8; -1.0; -1.2 and -1.4 MPa for four, six and eight days. Germination, germination speed index (GSI), emergence, emergence speed index (ESI) and expression of superoxide dismutase (SOD), catalase (CAT) and peroxidase (PO) enzymes were assessed. E. erythropappus seed priming in polyethylene glycol solution with potentials between -0.8 MPa and -1.4 MPa is not satisfactory because it adversely affects germination and reduces the activity of peroxidase and catalase enzymes. The other substances were not significant so there is a need for further research with other substances and / or concentrations

scholarly journals Stress Metabolism II. Changes in Proline Concentration in Excised Plant Tissues

1973 ◽  
Vol 26 (1) ◽  
pp. 57 ◽  
Author(s):  
TN Singh ◽  
D Aspinall ◽  
LG Paleg ◽  
SF Boggess
Keyword(s):  
Polyethylene Glycol ◽  
Osmotic Stress ◽  
Root Systems ◽  
Leaf Sheath ◽  
Plant Tissues ◽  
Distilled Water ◽  
Leaf Lamina ◽  
Imino Acid ◽  
Glycol Solution ◽  
Proline Concentration

Shoot apices and excised root systems and sections of the lamina and leaf sheath of the first leaf of to-day barley (cv. Prior) plants were incubated on aerated polyethylene glycol solution (osmotic potential -20 bars) or distilled water. The imino acid proline accumulated rapidly in the leaf lamina sections subjected to osmotic stress and less rapidly, after a delay of 16 hr, in those floated on water.

scholarly journals Green Fabrication of Copper Nanoparticles Dispersed in Walnut Oil Using Laser Ablation Technique

2016 ◽  
Vol 2016 ◽  
pp. 1-7 ◽  
Author(s):  
Amir Reza Sadrolhosseini ◽  
Suraya Abdul Rashid ◽  
Azmi Zakaria ◽  
Kamyar Shameli
Keyword(s):  
Particle Size ◽  
Laser Ablation ◽  
Copper Nanoparticles ◽  
Volume Fraction ◽  
Spherical Shape ◽  
Copper Plate ◽  
Refractive Indices ◽  
Walnut Oil ◽  
Laser Ablation Method ◽  
Environmentally Sensitive

Synthesis of copper nanoparticles was achieved by laser irradiation of copper plate in walnut oil. The copper plate was irradiated using Nd:YAG pulse laser at different ablation time from 5 to 50 minutes, and the prepared samples were characterized using analytical methods to find the optical absorption, morphology, particle size, and capping of copper nanoparticles with walnut oil. Consequently, the absorption peak appeared at about 615, 606, 588, 576, and 561 nm; and the nanoparticles formed in spherical shape in walnut oil. The particle size varied from 25 to 4.01 nm, and the tail of the carbonyl band capped the copper nanoparticles through the electron transfer from the carboxylic group to copper nanoparticles. The refractive indices of the nanofluid were measured using a surface plasmon resonance technique and changed from 1.4691 + 0.008i to 1.4682 + 0.043i as the volume fraction increased from 0.0257 × 10−5to 1.26 × 10−5. Consequently, the laser ablation method is environmentally sensitive (i.e., green) and thus is suitable for the fabrication of copper nanoparticles in walnut oil without any agent.

The effect of nanoparticle presence on aerosol formation during nanoparticle-enhanced laser ablation inductively coupled plasma mass spectrometry

2020 ◽  
Vol 35 (12) ◽  
pp. 2893-2900
Author(s):  
Markéta Holá ◽  
Zita Salajková ◽  
Aleš Hrdlička ◽  
Jakub Ondráček ◽  
Karel Novotný ◽  
...  
Keyword(s):  
Mass Spectrometry ◽  
Particle Size ◽  
Gold Nanoparticles ◽  
Laser Ablation ◽  
Inductively Coupled Plasma ◽  
Sample Surface ◽  
Aerosol Formation ◽  
Inductively Coupled ◽  
Plasma Mass Spectrometry ◽  
Metallic Sample

The presence of gold nanoparticles on the metallic sample surface positively changes the particle size distribution of the laser ablation aerosol.

An improved small-angle X-ray scattering analysis of δ′ precipitation in an Al–Li alloy for growth kinetic studies

1999 ◽  
Vol 32 (3) ◽  
pp. 426-435 ◽  
Author(s):  
Cheng-Si Tsao ◽  
Tsang-Lang Lin
Keyword(s):  
Particle Size ◽  
Size Distribution ◽  
Hard Sphere ◽  
Volume Fraction ◽  
The Other ◽  
Improved Method ◽  
Saxs Data ◽  
X Ray ◽  
X Ray Scattering ◽  
Two Parameters

An improved method for small-angle X-ray scattering (SAXS) data analysis is developed to reconstruct the free-form particle size distribution of δ′ precipitation in an Al–Li alloy. This improved method consists of four iterative steps; the interparticle interference is also included. The indirect transform method (ITM) plus a hard-sphere (HS) model which considers the depleted zones are used in the analysis of δ′ precipitation in an Al–Li alloy. Two parameters, namely the hard-sphere volume fraction, ηHS, and the ratio of hard-sphere radius to the particle radius,RHS/R, which determine the structure factor of the interparticle effect, are iteratively calculated using the monodisperse assumption and Gaussian size distribution. These two parameters are finally used in reconstructing the particle size distribution by the ITM + HS method. This method is tested by analysing simulated SAXS data and shows a better agreement than found in similar studies. This improved method is applied to analyse a set of experimental SAXS intensities from δ′ (Al3Li particles) precipitation in an Al–9.7 at.% Li alloy. The monodisperse results are compared with the polydisperse ITM + HS results. The current ITM + HS method fits the SAXS data better than the other methods. The variations of average radii with aging time were found to follow the kinetic power law. The SAXS results are used to investigate the theoretical kinetic model of the volume-fraction effect on late-stage coarsening (Ostwald ripening). By comparing both experimentally obtained asymptotic size distributions of δ′ particles as well as coarsening rate constants with those predicted by the various kinetic models, the modified Lifshitz–Slyozov–Wagner (MLSW) theory is found to be in better agreement with the experimental results than the other theories.

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