scholarly journals Effects of surface coordination of atoms on the surface properties of Cd-X (X= Ga, Zn) liquid alloys

2018 ◽  
Vol 2 ◽  
pp. 90-95
Author(s):  
Ishwar Koirala
Keyword(s):  
Surface Tension ◽  
Statistical Mechanics ◽  
Surface Properties ◽  
Order Parameter ◽  
Surface Concentration ◽  
Concentration Fluctuations ◽  
Liquid Alloys ◽  
Model Surface ◽  
Mechanics Model ◽  
Effect Of Surface

We have investigated the effect of surface coordination of atoms on the surface properties of Cd-Ga and Cd-Zn liquid alloys by varying their surface coordination fractions using statistical mechanics model. Surface tension and surface concentration did not have significant effect on the calculation of both surface tension and surface concentration of two alloys. The computation of the concentration fluctuations at the surface revealed that it was sensitive to the surface coordination fractions of both segregating systems. In those alloys we found that the computation of the Warren-Cowley short rang order parameter was influenced by the surface coordination fractions.

scholarly journals Microscopic and Surface Properties of K-Na Liquid Alloys

2013 ◽  
Vol 4 ◽  
pp. 40-45
Author(s):  
I. Koirala ◽  
B. P. Singh ◽  
I. S. Jha
Keyword(s):  
Surface Properties ◽  
Order Parameter ◽  
Short Range ◽  
Short Range Order ◽  
Energy Parameter ◽  
Surface Concentration ◽  
Liquid Alloys ◽  
Range Order Parameter ◽  
Temperature Dependent ◽  
Long Wavelength

The deviation from ideal mixture behavior and concentration dependent symmetry in the microscopic and surface properties of K-Na liquid alloy is investigated within a simple statistical model. The concentration dependent of microscopic functions(concentration fluctuation in the long wavelength limit, Warren-Cowley short range order parameter) and surface properties(surface concentration and surface tension) has got special attention to show a tendency of like atom pairing in the mixture. The theoretical analysis reveals that energy parameter is temperature dependent, K-Na alloys is of weakly interacting system and K-atoms segregates on the surface of K-Na liquid alloys at bulk concentration of Na.The Himalayan Physics Vol. 4, No. 4, 2013 Page: 40-45 Uploaded date: 12/23/2013 

scholarly journals Transport and Surface Properties of Molten Cd-Zn Alloys

2015 ◽  
Vol 19 (1) ◽  
pp. 14-18 ◽  
Author(s):  
I Koirala ◽  
B.P. Singh ◽  
I.S. Jha
Keyword(s):  
Surface Tension ◽  
Statistical Theory ◽  
Surface Properties ◽  
Surface Concentration ◽  
Liquid Alloys ◽  
Negative Deviation ◽  
Mixing Parameters ◽  
Weak Phase ◽  
Thermo Physical Properties ◽  
Zn Alloys

Simple statistical theory has been used to report the thermo-physical properties of mixing in liquid Cd-Zn alloys. The energetic of mixing in liquid alloys has been analyzed through the study of surface properties (surface tension, surface concentration) and transport properties (diffusivity, viscosity). Negative deviation from Raoultian behaviour has been observed in the computed mixing parameters (viscosity, surface tension) of the alloys. The computed results support a weak phase-separation tendency in molten Cd-Zn system.Journal of Institute of Science and Technology, 2014, 19(1): 14-18

Surface Properties of Ag-Cu-Zr Liquid Alloys in Relation to the Wettability of Boride Ceramics

2006 ◽  
Vol 512 ◽  
pp. 211-216 ◽  
Author(s):  
R. Novakovic ◽  
Maria Luigia Muolo ◽  
E. Ricci ◽  
E. Ferrera ◽  
D. Giuranno ◽  
...  
Keyword(s):  
Surface Tension ◽  
Surface Properties ◽  
Surface Composition ◽  
Point Of View ◽  
Ceramic Substrate ◽  
Work Of Adhesion ◽  
Experimental Point ◽  
Liquid Alloys ◽  
Wetting Phenomena ◽  
Angle Data

The wetting phenomena and adhesion between Ag-Cu-Zr molten alloys (where Zr is an active brazing element) and ZrB2-ceramic substrate have been investigated from theoretical and experimental point of view. The wetting phenomena of molten alloy/ceramic substrate depend on the bonding characteristics of liquid alloys and ceramics as well as the magnitude of interactive forces at the interface. Accordingly, the first step of this investigation is to determine the surface properties of Ag-Cu, Ag-Zr and Cu-Zr liquid alloys. The energetics of the bulk and the surface of liquid alloys have been analysed in the framework of statistical mechanical theory in conjunction with Quasi-Lattice Theory (QLT), through the study of the concentration dependence of various properties such as surface tension, surface composition, concentration fluctuations in the long wavelength limit and Warren-Cowley chemical short-range order parameter. Combining the Young and the Dupré equations, the obtained values of surface tension together with contact angle data have been used to calculate the work of adhesion.

scholarly journals Surface Properties of Al–Fe–Si Liquid Alloy Using Thermodynamic Database

2020 ◽  
Vol 6 (2) ◽  
pp. 10-19
Author(s):  
U. Mehta ◽  
S. K. Yadav ◽  
I. Koirala ◽  
D. Adhikari
Keyword(s):  
Surface Tension ◽  
Ternary Alloy ◽  
Binary Systems ◽  
Excess Free Energy ◽  
Surface Concentration ◽  
Liquid Alloys ◽  
Free Energies ◽  
Temperature Dependent ◽  
Excess Surface ◽  
Good Agreement

Temperature-dependent interaction parameters for excess free energies of mixing of sub-binary systems of Al-Fe-Si ternary liquid alloys were optimised using the experiment data in the frame of Redlich-Kister (R-K) polynomials. These optimised parameters were then used to compute the partial excess free energy of sub-binary and ternary liquid alloys. The surface tension and surface concentration of sub-binary and the ternary liquid alloys were computed using Butler equation. The temperature dependent coefficients of R-K polynomials for excess surface tensions of the sub-binary systems were optimised which were then used to estimate the surface tension of ternary alloy using Chou, Kohler and Toop modelling equations at temperatures 1773, 1873, 1973 and 2073 K. The surface tension of the ternary alloy obtained using aforementioned models were found to be in good agreement from Fe and Al corners but some deviations were observed from Si corner.

DECOUPLING THE EFFECT OF SURFACE TENSION AND VISCOSITY ON SPRAY CHARACTERISTICS UNDER DIFFERENT AMBIENT PRESSURES: NEAR-NOZZLE BEHAVIOR AND MACROSCOPIC CHARACTERISTICS

2019 ◽  
Vol 29 (7) ◽  
pp. 629-654
Author(s):  
Zehao Feng ◽  
Shangqing Tong ◽  
Chenglong Tang ◽  
Cheng Zhan ◽  
Keiya Nishida ◽  
...  
Keyword(s):  
Surface Tension ◽  
Spray Characteristics ◽  
Effect Of Surface

Surfactant Impurities Can Explain the Jones-Ray Effect

2018 ◽  
Author(s):  
Timothy Duignan ◽  
Marcel Baer ◽  
Christopher Mundy
Keyword(s):  
Surface Tension ◽  
Electrostatic Potential ◽  
Driving Forces ◽  
Salt Water ◽  
Fundamental Property ◽  
Apparent Contradiction ◽  
Low Salt ◽  
Air Water Interface ◽  
Added Salt ◽  
Effect Of Surface

<div> <p> </p><div> <div> <div> <p>The surface tension of dilute salt water is a fundamental property that is crucial to understanding the complexity of many aqueous phase processes. Small ions are known to be repelled from the air-water surface leading to an increase in the surface tension in accordance with the Gibbs adsorption isotherm. The Jones-Ray effect refers to the observation that at extremely low salt concentration the surface tension decreases in apparent contradiction with thermodynamics. Determining the mechanism that is responsible for this Jones-Ray effect is important for theoretically predicting the distribution of ions near surfaces. Here we show that this surface tension decrease can be explained by surfactant impurities in water that create a substantial negative electrostatic potential at the air-water interface. This potential strongly attracts positive cations in water to the interface lowering the surface tension and thus explaining the signature of the Jones-Ray effect. At higher salt concentrations, this electrostatic potential is screened by the added salt reducing the magnitude of this effect. The effect of surface curvature on this behavior is also examined and the implications for unexplained bubble phenomena is discussed. This work suggests that the purity standards for water may be inadequate and that the interactions between ions with background impurities are important to incorporate into our understanding of the driving forces that give rise to the speciation of ions at interfaces. </p> </div> </div> </div> </div>

Effect of surface properties and polymer chain length on polymer adsorption in solution

2021 ◽  
Vol 155 (3) ◽  
pp. 034701
Author(s):  
Emily Y. Lin ◽  
Amalie L. Frischknecht ◽  
Karen I. Winey ◽  
Robert A. Riggleman
Keyword(s):  
Surface Properties ◽  
Chain Length ◽  
Polymer Chain ◽  
Polymer Adsorption ◽  
Effect Of Surface
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