scholarly journals Size and Shape Dependence on Melting Temperature of Gallium Nitride Nanoparticles

2012 ◽  
Vol 2012 ◽  
pp. 1-11 ◽  
Author(s):  
Paneerselvam Antoniammal ◽  
Dakshanamoorthy Arivuoli
Keyword(s):  
Gallium Nitride ◽  
Melting Point ◽  
Melting Temperature ◽  
Comparative Investigation ◽  
Radius Of Curvature ◽  
Shape Effect ◽  
Size And Shape ◽  
Shape Dependence ◽  
Gallium Nitride Nanoparticles ◽  
Thermodynamical Model

The study of variation of the size and shape effect on the melting property of gallium nitride nanoparticles with their spherical and cylindrical geometrical feature is theoretically explored. A numerical thermodynamical model has been devoted for the study. A comparative investigation is made between the two shapes, at the range of ~3 nm dia. The cylindrical GaN nanoparticles, whose melting point has been reported to decrease with decreasing particle radius, become larger than spherical-shaped nanoparticles. The melting temperature obtained in the present study is in line with the function of radius of curvature.

MELTING-THERMODYNAMIC CHARACTERISTICS OF Fe, Co, Ni MAGNETIC NANOCRYSTALS

2005 ◽  
Vol 19 (25) ◽  
pp. 1253-1260 ◽  
Author(s):  
L. F. CAO ◽  
M. P. WANG ◽  
D. XIE ◽  
Z. LI ◽  
G. Y. XU
Keyword(s):  
Melting Temperature ◽  
Thermodynamic Characteristics ◽  
Experimental Results ◽  
Simplified Model ◽  
Size And Shape ◽  
Magnetic Nanocrystals ◽  
Shape Dependence ◽  
Theoretical Predictions ◽  
Melting Thermodynamics

A simplified model that describes the size and shape dependence of melting thermodynamics of full free nanocrystals was established. Critical sizes of Fe , Co , Ni magnetic nanocrystals when the crystals keep their crystallinity were calculated and the corresponding minimum melting temperature was predicted. Theoretical predictions were consistent with experimental results.

Size and Shape Dependence of the Vibrational Spectrum and Low-Temperature Specific Heat of Au Nanoparticles

2013 ◽  
Vol 117 (47) ◽  
pp. 25160-25168 ◽  
Author(s):  
Huziel E. Sauceda ◽  
Fernando Salazar ◽  
Luis A. Pérez ◽  
Ignacio L. Garzón
Keyword(s):  
Low Temperature ◽  
Vibrational Spectrum ◽  
Specific Heat ◽  
Au Nanoparticles ◽  
Size And Shape ◽  
Shape Dependence ◽  
Low Temperature Specific Heat

scholarly journals MODELLING THE MELTING TEMPERATURE OF A LIPID‐BASED CRITICAL TEMPERATURE INDICATOR: A COMPARISION BETWEEN SIMPLEX-LATTICE AND SIMPLEX-CENTROID DESIGNS

2018 ◽  
Vol 35 (2) ◽  
Author(s):  
KARINE CRISTINE KAUFMANN ◽  
ODINEI HESS GONÇALVES ◽  
EVANDRO BONA ◽  
FERNANDA VITÓRIA LEIMANN
Keyword(s):  
Critical Temperature ◽  
Melting Point ◽  
Melting Temperature ◽  
Predictive Ability ◽  
Ternary Mixtures ◽  
Lipid Mixture ◽  
Color Changes ◽  
Lattice Design ◽  
Simplex Lattice ◽  
Improved Model

Critical temperature indicators (CTI) find applications in food industry in cases when defrost may not occur or a specific temperature may not be reached, , indicating changes through visual changes, such as melting, color changes, etc. Lipid mixtures are promising candidates to formulate CTI since the final melting point of the mixture may be manipulated by the proportion of each lipid. In this work a lipid mixture consisting of stearic acid, lard and peanut oil was used to develop a CTI mixture. Simplex-lattice and Simplex-centroid experimental designs were compared to modelling the melting temperature of the lipid mixture. Addition of axial points to the experimental design improved predictive ability of the models while the inclusion of inverse terms was necessary to improve models accuracy. Simplex-lattice design presented an improved ability to predict the melting point of binary mixtures, while the simplex-centroid design resulted in an improved model for predicting melting point of the ternary mixtures

scholarly journals How Atoms of Polycrystalline Nb 20.6 Mo 21.7 Ta 15.6 W 21.1 V 21.0 refractory High-Entropy Alloys Rearrange during the Melting Process

2021 ◽  
Author(s):  
Shin-Pon Ju ◽  
Chen-Chun Li
Keyword(s):  
Molecular Dynamics ◽  
Melting Point ◽  
Single Crystal ◽  
Melting Temperature ◽  
Md Simulation ◽  
Melting Process ◽  
Structural Rearrangement ◽  
High Entropy Alloys ◽  
High Entropy ◽  
Melting Mechanism

Abstract The melting mechanism of single crystal and polycrystalline Nb 20.6 Mo 21.7 Ta 15.6 W 21.1 V 21.0 RHEAs was investigated by the molecular dynamics (MD) simulation using the 2NN MEAM potential. For the single crystal RHEA, the density profile displays an abrupt drop from 11.25 to 11.00 g/cm 3 at temperatures from 2910 to 2940 K, indicating all atoms begin significant local structural rearrangement. For polycrystalline RHEAs, a two-stage melting process is found. In the first melting stage, the melting of the grain boundary (GB) regions firstly occurs at the pre-melting temperature, which is relatively lower than the corresponding system-melting point. At the pre-melting temperature, most GB atoms have enough kinetic energies to leave their equilibrium positions, and then gradually induce the rearrangement of grain atoms close to GB. In the second melting stage at the melting point, most grain atoms have enough kinetic energies to rearrange, resulting in the chemical short-ranged order (CSRO) changes of all pairs.

Residual Stress in Bone: A Parametric Study

2008 ◽  
Author(s):  
A. Hizal ◽  
B. Sadasivam ◽  
D. Arola
Keyword(s):  
Residual Stress ◽  
Particle Size ◽  
Residual Stresses ◽  
Material Removal ◽  
Surface Deformation ◽  
Radius Of Curvature ◽  
Near Surface ◽  
Size And Shape ◽  
Air Jet ◽  
Particle Size And Shape

A preliminary study was conducted to evaluate the parametric dependence of the residual stress distributions in bone that result from an abrasive air-jet surface treatment. Specifically, the influence of particle size and shape used in the treatment on the residual stress, propensity of embedding particles and material removal were studied. Rectangular beams of cortical bone were prepared from bovine femurs and treated with aluminum oxide and glass particles with different treatment angles. Residual stresses within the bone were quantified in terms of the radius of curvature of the bone specimens measured before and after the treatments, as well as a function of time to quantify decay in the stress. The sub-surface distribution was also examined using the layer removal technique. Results showed that the particle size and shape could be used to control the amount of material removal and the magnitude of residual stress within the treated surfaces. An increase in size of the glass particles resulted in an increase in the residual stress and a decrease in material removed during the treatment. The magnitude of residual stress ranged from 22 MPa to nearly 44 MPa through modulation of the particle qualities (size and shape). A microscopic examination of the treated surfaces suggests that the residual stresses resulted primarily from near-surface deformation.

Human Body Size and Shape Effect on UWB On-Body WBAN Radio Channels - Preliminary Results

2014 ◽  
Author(s):  
Timo Kumpuniemi ◽  
Matti Hämäläinen ◽  
Kamya Yekeh Yazdandoost ◽  
Jari Iinatti
Keyword(s):  
Body Size ◽  
Human Body ◽  
Shape Effect ◽  
Preliminary Results ◽  
Radio Channels ◽  
Size And Shape

The Gallium Melting-Point Standard: A Determination of the Liquid—Solid Equilibrium Temperature of Pure Gallium on the International Practical Temperature Scale of 1968

1977 ◽  
Vol 23 (4) ◽  
pp. 719-724 ◽  
Author(s):  
Donald D Thornton
Keyword(s):  
Melting Point ◽  
Melting Temperature ◽  
Temperature Scale ◽  
Equilibrium Temperature ◽  
Melting Range ◽  
Practical Temperature ◽  
Practical Temperature Scale ◽  
Gallium Melting Point

Abstract The sharpness and reproducibility of the gallium melting point were studied, and the melting temperature of gallium in terms of IPTS-68 was determined. Small melting-point cells designed for use with thermistors are described. Nine gallium cells including three levels of purity were used in 68 separate determinations of the melting point. The melting point of 99.99999% pure gallium in terms of IPTS-68 is found to be 29.7714 ± 0.0014 °C; the melting range is less than 0.0005 °C and is reproducible to ±0.0004 °C.

scholarly journals Seeded-Growth Experiment Demonstrating Size- and Shape-Dependence on Gold Nanoparticle–Light Interactions

2020 ◽  
Author(s):  
Gail A. Vinnacombe-Willson ◽  
Naihao Chiang ◽  
Paul S. Weiss ◽  
Sarah H. Tolbert ◽  
Leonardo Scarabelli
Keyword(s):  
Gold Nanoparticle ◽  
Growth Experiment ◽  
Seeded Growth ◽  
Size And Shape ◽  
Shape Dependence
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