Ultrasonic Characterization of Silver Nanoparticles

2005 ◽  
Vol 23 ◽  
pp. 271-274
Author(s):  
S. Rajagopalan ◽  
S.J. Sharma ◽  
V.Y. Nanotkar
Keyword(s):  
Silver Nanoparticles ◽  
Ultrasonic Velocity ◽  
Colloidal Solution ◽  
Adiabatic Compressibility ◽  
Ammonium Bromide ◽  
Velocity Measurements ◽  
Abnormal Behaviour ◽  
Phase Separations ◽  
Ultrasonic Characterization

Nanoparticles exhibit unusual properties in contrast with their bulk properties due to small particle size and quantum confinement. In the present work, ultrasonic velocity and density measurements have been carried out in solutions of silver nanoparticles in micellar dispersion of cetyl tri-metyl ammonium bromide, CTAB. Ultrasonic velocity measurements at different concentrations of surfactant and temperatures were carried out using Sing-Around technique, operated at 2MHz. It is observed that ultrasonic velocity and adiabatic compressibility show abnormal behaviour with increase in concentration of CTAB in the solution, indicating the existence of the phase separations in nano-colloidal solution.

A Study of the Effect of Polymer Matrix on the Ultrasonic Propagation in Silver Nanoparticles

2005 ◽  
Vol 23 ◽  
pp. 319-322 ◽  
Author(s):  
S. Rajagopalan ◽  
S.J. Sharma ◽  
V.Y. Nanotkar
Keyword(s):  
Silver Nanoparticles ◽  
Phase Separation ◽  
Ultrasonic Velocity ◽  
Polymer Matrix ◽  
Velocity Measurements ◽  
Abnormal Behaviour ◽  
Phase Separations ◽  
Higher Temperature ◽  
Velocity Of Propagation ◽  
Ultrasonic Propagation

In the present work, ultrasonic velocity measurements have been carried out in solutions of silver nanoparticles in the polymer matrix of poly(sodium, 4-styrene sulphonate) using Sing-Around technique, operated at 2 MHz.. The ultrasonic velocity of propagation shows an abnormal behaviour, indicating the existence of the phase separations in nano-colloidal solution. The effect of polymer is observed to be predominant in the phase separation at the lower concentrations of polymer in the mixture. At higher concentrations of the polymer in the mixture the phase separation seems to subside at higher temperature.

CHARACTERIZATION OF PRECIPITATION BEHAVIOR IN NIMONIC 263 BY ULTRASONIC VELOCITY MEASUREMENTS

2009 ◽  
Author(s):  
G. V. S. Murthy ◽  
Kumar Anish ◽  
G. Sridhar ◽  
T. Jayakumar ◽  
R. N. Ghosh ◽  
...  
Keyword(s):  
Ultrasonic Velocity ◽  
Velocity Measurements ◽  
Precipitation Behavior

Ultrasonic Characterization of the Elastic Constants in an Aging Ti-6Al-4V ELI Alloy

2019 ◽  
Author(s):  
Hector Carreon
Keyword(s):  
Elastic Properties ◽  
Ultrasonic Velocity ◽  
Precipitation Process ◽  
Material Microstructure ◽  
Clear Trend ◽  
Sem Image ◽  
Wave Velocities ◽  
Ultrasonic Characterization ◽  
Α Phase

Abstract In this paper, we report the experimental data of the elastic properties of the young and shear modulus based on the variation in the ultrasonic velocity parameter during the microstructural evolution in a Ti-6Al-4V alloy with two varying microstructures, bimodal and acicular respectively. The two different initial microstructures, were treated thermally by aging at 515°C, 545°C and 575°C at different times from 1 min to 576hr to induce a precipitation process. Ultrasonic measurements of shear and longitudinal wave velocities, scanning electron microscopy (SEM) image processing, optical microscopy (OM) and microhardness were performed, establishing a direct correlation with the measurements of the ultrasonic velocity and the elastic properties developed during the thermal treatment of the artificial aging. The results of the ultrasonic velocity show a very clear trend as the aging time progresses, which is affected by precipitation of Ti3Al particles inside the α phase. In this way, we can know, in a fast and efficient way, the elastic properties developed during the heat treatment of aging at long times, since the presence of these precipitates hardens the material microstructure affecting the final mechanical properties.

Synthesis and Characterization of TTAB Coated Silver (Ag) Nanoparticles

2011 ◽  
Vol 264-265 ◽  
pp. 530-534
Author(s):  
M.M. Alam ◽  
M. Harun ◽  
Momtazul Islam
Keyword(s):  
Silver Nanoparticles ◽  
Ag Nanoparticles ◽  
Silver Clusters ◽  
Ammonium Bromide ◽  
X Ray Diffraction ◽  
Preferential Growth ◽  
X Ray ◽  
Average Size ◽  
20 Nm

Silver nanoparticles protected by Tetradecyltrimethyl Ammonium Bromide (TTAB) were prepared in a one-phase electrochemical system. Electrochemical procedure, based on the dissolution of a metallic anode in an appropriate solvent, has been used to get silver nanoparticles. It is possible to get different particle size by changing the current density. The optical properties of the silver Nanoparticles were investigated by UV-Vis and Photoluminescence (PL) Spectroscopy. Absorption peak were found 424 nm which confirm the presence of Ag nanoparticles. The structural properties of the samples were carried out by scanning electron microscopy (SEM) and X-ray diffraction (XRD) measurements. XRD confirmed the preferential growth of Ag nanoparticles whose average size is ≈ 20 nm in the <111> orientation as well as purity of silver clusters.

scholarly journals Acoustical Investigation of N–(2-hydroxybenzylidene)-3-Substituted Pyridine -2- Amine Schiff bases by Ultrasonic Velocity Measurements in Dioxane at Different Temperatures

2016 ◽  
Vol 4 (1) ◽  
Author(s):  
Mrunal M. Mahajan ◽  
Pravin B. Raghuwanshi
Keyword(s):  
Schiff Bases ◽  
Ultrasonic Velocity ◽  
Adiabatic Compressibility ◽  
Water Molecules ◽  
Water Medium ◽  
Velocity Measurements ◽  
Acoustic Parameters ◽  
Intermolecular Free Length ◽  
Different Temperatures ◽  
Solvent Molecules

<div><p><em>The present work deals with the study of acoustic parameters like ultrasonic velocity (V), </em><em>adiabatic compressibility (β<sub>s</sub>), apparent molar volume (</em><em>f</em><em><sub>v</sub></em><em>) and intermolecular free length (L<sub>f</sub>) by ultrasonic </em><em>interferometric measurements</em><em> which reflects structural interaction of water molecules and organic solvent molecules with substituted Schiff bases. The study of N–(2-hydroxybenzylidene)-3-substituted pyridine -2- amine Schiff bases were carried in different percentage of 1,4-dioxane-water medium, at 293, 297 and 300 K. The densities and velocities thus obtained were used to evaluate acoustic parameters for all the ligands.</em></p></div>

Characterization of the alumina–zirconia ceramic system by ultrasonic velocity measurements

2009 ◽  
Vol 60 (8) ◽  
pp. 875-881 ◽  
Author(s):  
Hector Carreon ◽  
Alberto Ruiz ◽  
Ariosto Medina ◽  
Gerardo Barrera ◽  
Juan Zarate
Keyword(s):  
Ultrasonic Velocity ◽  
Zirconia Ceramic ◽  
Velocity Measurements ◽  
Ceramic System

scholarly journals Ultrasonic Characterization of Ceramics

1987 ◽  
Author(s):  
Michael J. Slavin ◽  
Jeffrey J. Gruber
Keyword(s):  
Silicon Carbide ◽  
Heat Engine ◽  
Control Procedure ◽  
Structure And Properties ◽  
Velocity Measurements ◽  
Ultrasonic Characterization ◽  
Ultrasonic Measurements ◽  
Ultrasonic Techniques ◽  
Flexural Tests

This paper discusses ultrasonic nondestructive evaluation (NDE) methods that are useful for ceramic characterization. These methods are: ultrasonic velocity measurements, velocity and defect C-scans and attenuation measurements. The way in which the ultrasonic measurements are influenced by the ceramic’s structure and properties is examined. The ultrasonic techniques discussed in this paper are routinely used as part of an inspection/quality control procedure of ceramics for armor and heat engine applications. Sintered beta silicon carbide (β-SiC), sintered alpha silicon carbide (α-SiC) and hot pressed titanium diboride (TiB2) have been well characterized by these techniques. Elastic modulus values as determined from velocity measurements agree very well with values measured from flexural tests. Correlations between the velocity C-scans, elastic properties and densities have also been determined. The limitations and potential of each of the ultrasonic techniques are discussed.

Sign in / Sign up

Export Citation Format

Share Document