Applied Science Private University

About: Applied Science Private University is a education organization based out in Amman, Jordan. It is known for research contribution in the topics: Population & Catalysis. The organization has 4124 authors who have published 5299 publications receiving 116167 citations.

Four Important Onset Pressures for Mutual Interactions between Each of Three Crude Oils and CO2

Abstract: In this paper, mutual interactions between each of three different crude oils and CO2 are experimentally studied. Three crude oils include two light crude oils and one medium crude oil. First, a series of saturation tests are conducted to determine the onset pressure of asphaltene precipitation for each crude oil−CO2 system. Second, the equilibrium interfacial tension (IFT) between each crude oil and CO2 is measured as a function of the equilibrium pressure. The so-called minimum miscibility pressure (MMP) of each crude oil−CO2 system is determined by applying the vanishing interfacial tension (VIT) technique. Third, the oil-swelling effect and initial strong light-components extraction are observed during the IFT measurements. It is found that the onset pressure of asphaltene precipitation is lower if the asphaltene content of the crude oil is higher. It is also found that the measured equilibrium IFT is reduced almost linearly with the equilibrium pressure in three distinct pressure ranges for the two l...

Moisture-induced degradation and its mechanism of (Sr,Ca)AlSiN3:Eu2+, a red-color-converter for solid state lighting

Abstract: (Sr,Ca)AlSiN3:Eu2+ (SCASN) is a very promising red phosphor used as a down-conversion luminescent material in solid state lighting. In this study, the moisture-induced degradation of SCASN was comprehensively investigated by treating it under severe conditions with high-pressure water steam. The degradation initiated at 150 °C, and the luminescence of SCASN was quenched quickly, with the powder sample being bleached after the treatment. Both the microstructure and phase changed obviously with oxidation, and the host turned finally into NH3, (Sr,Ca)Al2Si2O8 and Ca(OH)2. Using a variety of spectroscopic, surface and microstructure analytical techniques, the degradation mechanism was clarified and proposed to occur via the oxidant-gas penetration mechanism through the moisture-enhanced oxidation of both the SCASN host and divalent europium. The activation energy for the moisture-induced degradation was about 66.32 kJ mol−1.