Estimation of Temperature Dependency on Crystallization Using the Critical Supersaturation Ratio (Sc)

2017 ◽  
Vol 50 (8) ◽  
pp. 666-668
Author(s):  
Daiki Nagamatsu ◽  
Norihito Sato ◽  
Hiroshi Takiyama
Keyword(s):  
Temperature Dependency ◽  
Supersaturation Ratio ◽  
Critical Supersaturation

Formation of Alumina Inclusions during Counter Diffusion of Aluminum and Oxygen Dissolved in Molten Iron

2013 ◽  
Vol 315 ◽  
pp. 260-267
Author(s):  
Yokoyama Seiji ◽  
Nik Hisyamudin Muhd Nor
Keyword(s):  
Oxygen Content ◽  
Diffusion Front ◽  
Supersaturation Ratio ◽  
X Ray ◽  
Irreversible Reaction ◽  
Inclusion Formation ◽  
Initial Oxygen Content ◽  
Critical Supersaturation ◽  
Initial Oxygen ◽  
Counter Diffusion

The formation of alumina (Al2O3) inclusions was experimentally investigated with the capillary-reservoir method. The inclusions were observed with a SEM (scanning electron microscope). The compositions of iron matrix and inclusion were measured with an EDX (energy dispersive X-ray analysis). The content profile of aluminum was discussed by the counter-diffusion model of aluminum and oxygen with an instantaneous irreversible reaction for alumina formation. The inclusions of spherical and polygonal alumina and spherical hercynite (FeOAl2O3) were observed in the vicinity of the diffusion front of aluminum. The hercynite was detected when the initial oxygen content was 0.075 mass% and higher. When the initial oxygen content was more than 0.045 mass% and higher, dendritic alumina formed at the position that was nearer to the interface than the position of spherical and polygonal inclusions. No inclusion was observed around the interface because of the re-dissolution of the inclusions. The initiating position of the inclusion formation was approximated by the reaction position, Zr, obtained from the model on the assumption that aluminum and oxygen contents at the reaction position were zero. Empirically, 0.9×Zr and 0.17×Zr expressed the initiating positions of formation and re-dissolution of inclusions respectively. The critical supersaturation ratio was estimated to be from 1 to 7.4×105, depending on the initial aluminum and oxygen contents.

Temperature dependency and carrier transport mechanisms of Ti/p-type InP Schottky rectifiers

2010 ◽  
Vol 504 (1) ◽  
pp. 146-150 ◽  
Author(s):  
V. Janardhanam ◽  
Hoon-Ki Lee ◽  
Kyu-Hwan Shim ◽  
Hyo-Bong Hong ◽  
Soo-Hyung Lee ◽  
...  
Keyword(s):  
Carrier Transport ◽  
Temperature Dependency ◽  
Transport Mechanisms ◽  
Schottky Rectifiers ◽  
P Type

scholarly journals Remediation of iron oxide bound Pb and Pb-contaminated soils using a combination of acid washing agents and l-ascorbic acid

RSC Advances ◽  
2020 ◽  
Vol 10 (62) ◽  
pp. 37808-37817
Author(s):  
Quan Li ◽  
Yilian Li ◽  
Zhe Yang ◽  
Xiang Li ◽  
Zhi Tang ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Iron Oxide ◽  
Contaminated Soils ◽  
Temperature Dependency ◽  
Acid Washing

In this study, the reductants and time–temperature dependency of dissolved FeOx–Pb were studied experimentally.

scholarly journals Effects of Temperature and Host Concentration on the Supramolecular Enantiodifferentiating [4 + 4] Photodimerization of 2-Anthracenecarboxylate through Triplet-Triplet Annihilation Catalyzed by Pt-Modified Cyclodextrins

Molecules ◽  
2019 ◽  
Vol 24 (8) ◽  
pp. 1502 ◽  
Author(s):  
Ming Rao ◽  
Wanhua Wu ◽  
Cheng Yang
Keyword(s):  
Light Emitting Diode ◽  
Temperature Dependency ◽  
Light Emitting ◽  
Modified Cyclodextrins ◽  
Direct Irradiation ◽  
Visible Light Driven ◽  
Significant Temperature ◽  
Effects Of Temperature ◽  
532 Nm ◽  
Triplet Triplet Annihilation

Visible-light-driven photocatalytic supramolecular enantiodifferentiating dimerization of 2-anthracenecarboxylic acid (AC) through triplet-triplet annihilation (TTA), mediated by the Schiff base Pt(II) complex (Pt-1, Pt-2, and Pt-3) was studied. The host concentration and the temperature effects on the stereoselectivity were comprehensively investigated. Increasing the concentration of sensitizers/hosts significantly enhanced the conversion of the photoreaction but led to reduced enantioselectivities of the chiral photodimers 2 and 3 when the photoreaction was triggered by a 532 nm laser, which was in contrast with the results obtained by direct irradiation of AC with a 365 nm light-emitting diode (LED) lamp, due to the aggregation of the sensitizer/host in water. The cyclization of AC through triplet-triplet annihilation displayed significant temperature dependency when Pt-3 was employed as the sensitizer/host. Increasing the temperature from 0 °C to 30 °C with 5% equiv. of Pt-3 led to a great increase of the ee of 2 from 2.1% to 31.6%. However, hardly any temperature dependency was observed when the photodimerization was mediated by other sensitizers and/or hosts, or the photoreaction was triggered directly with a 365 nm LED lamp.

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