scholarly journals The Apparent Surface Free Energy of Rare Earth Oxides is Governed by Hydrocarbon Adsorption

2021 ◽  
Author(s):  
Junho Oh ◽  
Daniel Orejon ◽  
Wooyoung Park ◽  
Hyeongyun Cha ◽  
Soumyadip Sett ◽  
...  
Keyword(s):  
Free Energy ◽  
Rare Earth ◽  
Surface Free Energy ◽  
Rare Earth Oxides ◽  
Hydrocarbon Adsorption

scholarly journals The Apparent Surface Free Energy of Rare Earth Oxides is Governed by Hydrocarbon Adsorption

iScience ◽  
2021 ◽  
pp. 103691
Author(s):  
Junho Oh ◽  
Daniel Orejon ◽  
Wooyoung Park ◽  
Hyeongyun Cha ◽  
Soumyadip Sett ◽  
...  
Keyword(s):  
Free Energy ◽  
Rare Earth ◽  
Surface Free Energy ◽  
Rare Earth Oxides ◽  
Hydrocarbon Adsorption

Effect of Hydrocarbon Adsorption on the Wetting of Rare Earth Oxides

2014 ◽  
Author(s):  
Daniel J. Preston ◽  
Nenad Miljkovic ◽  
Jean Sack ◽  
Ryan Enright ◽  
John Queeney ◽  
...  
Keyword(s):  
Rare Earth ◽  
Rare Earth Oxides ◽  
Hydrocarbon Adsorption

Performance and Application of Far Infrared Rays Emitted from Rare Earth Mineral Composite Materials

2008 ◽  
Vol 8 (3) ◽  
pp. 1203-1210 ◽  
Author(s):  
Jinsheng Liang ◽  
Dongbin Zhu ◽  
Junping Meng ◽  
Lijuan Wang ◽  
Fenping Li ◽  
...  
Keyword(s):  
Free Energy ◽  
Rare Earth ◽  
Composite Materials ◽  
Surface Free Energy ◽  
Dynamic Contact Angle ◽  
Far Infrared ◽  
Diesel Oil ◽  
Liquefied Petroleum Gas ◽  
X Ray ◽  
Rare Earth Mineral

Rare earth mineral composite materials were prepared using tourmaline and cerous nitrate as raw materials. Through characterization by scanning electron microscopy, X-ray diffraction, X-ray photo-electron spectroscopy, dynamic contact angle meter and tensiometer, and Fourier transform infrared spectroscopy, it was found that the composite materials had a better far infrared emitting performance than tourmaline, which depended on many factors such as material composition, microstructure, and surface free energy. Based on the results of the flue gas analyzer and the water boiling test, it was found that the rare earth mineral composite materials could accelerate the combustion of liquefied petroleum gas and diesel oil. The results showed that the addition of Ce led to the improvement of far infrared emitting performance of tourmaline due to the decrease of cell volume caused by the oxidation of more Fe2+ ions and the increase of surface free energy. The application of rare earth mineral composite materials to diesel oil led to a decrease in surface tension and flash point, and the fuel saving ratio could reach 4.5%. When applied to liquefied petroleum gas, the composite materials led to the enhanced combustion, improved fuel consumption by 6.8%, and decreased concentration of CO and O2 in exhaust gases by 59.7% and 16.2%, respectively; but the temperature inside the flue increased by 10.3%.

Smectic A-Smectic B interface : faceting and surface free energy measurement

1989 ◽  
Vol 50 (24) ◽  
pp. 3527-3534 ◽  
Author(s):  
P. Oswald ◽  
F. Melo ◽  
C. Germain
Keyword(s):  
Free Energy ◽  
Surface Free Energy ◽  
Energy Measurement ◽  
Smectic A

LASER SPECTROSCOPY OF RARE EARTH OXIDES

1987 ◽  
Vol 48 (C7) ◽  
pp. C7-611-C7-615
Author(s):  
C. LINTON
Keyword(s):  
Rare Earth ◽  
Laser Spectroscopy ◽  
Rare Earth Oxides

Evaluation of the life cycle in the production of separated mix of rare earth oxides, which are being mined in Australia

2019 ◽  
Author(s):  
P Koltun ◽  
V Novozhilov ◽  
V Klymenko
Keyword(s):  
Rare Earth ◽  
Life Cycle ◽  
Rare Earth Oxides

Effect of Rare Earth Oxides on Electrical Properties of Spark Plasma Sintered AlN Ceramics

2015 ◽  
Vol 30 (3) ◽  
pp. 267
Author(s):  
HUANG Lin-Yun ◽  
LI Chen-Hui ◽  
KE Wen-Ming ◽  
SHI Yu-Sheng ◽  
HE Zhi-Yong ◽  
...  
Keyword(s):  
Rare Earth ◽  
Electrical Properties ◽  
Rare Earth Oxides ◽  
Spark Plasma

Examination of the lubricant storing and releasing ability of thermally sprayed surfaces

2011 ◽  
Vol 2 (2) ◽  
pp. 101-105
Author(s):  
L. Fazekas ◽  
Z. S. Tiba ◽  
G. Kalácska
Keyword(s):  
Free Energy ◽  
Surface Energy ◽  
Surface Free Energy ◽  
Essential Role ◽  
Index Number ◽  
Adhesion Ability ◽  
Thermally Sprayed ◽  
Proper Operation

Abstract The lubricant storing and releasing ability of the thermally sprayed surfaces plays an essential role in the proper operation of the components. In the case of porous sprayed surfaces the lubricant storing and releasing ability depends mainly on porosity and the surface energy (adhesion susceptibility). The adhesion ability can also be expressed indirectly with an index number that is by determining the surface free energy.

A glance on rare earth oxides: importance, reserves, demand, applications, critical uncertainties, global economy, and zeta potential characterization

2020 ◽  
Vol 05 ◽  
Author(s):  
Silas Santos ◽  
Orlando Rodrigues ◽  
Letícia Campos
Keyword(s):  
Rare Earth ◽  
Zeta Potential ◽  
Sample Preparation ◽  
Rare Earths ◽  
Smart Materials ◽  
Global Economy ◽  
Materials Science ◽  
Functional Materials ◽  
Rare Earth Oxides ◽  
Interparticle Forces

Background: Innovation mission in materials science requires new approaches to form functional materials, wherein the concept of its formation begins in nano/micro scale. Rare earth oxides with general form (RE2O3; RE from La to Lu, including Sc and Y) exhibit particular proprieties, being used in a vast field of applications with high technological content since agriculture to astronomy. Despite of their applicability, there is a lack of studies on surface chemistry of rare earth oxides. Zeta potential determination provides key parameters to form smart materials by controlling interparticle forces, as well as their evolution during processing. This paper reports a study on zeta potential with emphasis for rare earth oxide nanoparticles. A brief overview on rare earths, as well as zeta potential, including sample preparation, measurement parameters, and the most common mistakes during this evaluation are reported. Methods: A brief overview on rare earths, including zeta potential, and interparticle forces are presented. A practical study on zeta potential of rare earth oxides - RE2O3 (RE as Y, Dy, Tm, Eu, and Ce) in aqueous media is reported. Moreover, sample preparation, measurement parameters, and common mistakes during this evaluation are discussed. Results: Potential zeta values depend on particle characteristics such as size, shape, density, and surface area. Besides, preparation of samples which involves electrolyte concentration and time for homogenization of suspensions are extremely valuable to get suitable results. Conclusion: Zeta potential evaluation provides key parameters to produce smart materials seeing that interparticle forces can be controlled. Even though zeta potential characterization is mature, investigations on rare earth oxides are very scarce. Therefore, this innovative paper is a valuable contribution on this field.

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