Influence of quenching rate and quenching media on formation of TeO2 glasses

The fluorescence quenching of 2-aminodiphenylamine (2ADPA), 4-aminodiphenylamine (4ADPA) and 4,4'-diaminodiphenylamine (DADPA) with tetrachloromethane, chloroform and dichloromethane have been studied in hexane, dioxane, acetonitrile and methanol as solvents. The quenching rate constants for the process have also been obtained by measuring the lifetimes of the fluorophores. The quenching was found to be dynamic in all cases. For 2ADPA and 4ADPA, the quenching rate constants of CCl4 and CHCl3 depend on the viscosity, whereas in the case of CH2Cl2, kq depends on polarity. The quenching rate constants for DADPA with CCl4 are viscosity-dependent but the quenching with CHCl3 and CH2Cl2 depends on the polarity of the solvents. From the results, the quenching mechanism is explained by the formation of a non-emissive complex involving a charge-transfer interaction between the electronically excited fluorophores and ground-state chloromethanes.

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New quenching media based on water-soluble polymers

Metal Science and Heat Treatment ◽

10.1007/bf01226357 ◽

1981 ◽

Vol 23 (2) ◽

pp. 104-106 ◽

Cited By ~ 1

Author(s):

A. V. Tolstousov ◽

O. A. Bannykh

Keyword(s):

Water Soluble ◽

Water Soluble Polymers ◽

Soluble Polymers ◽

Quenching Media

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Effect of chemical composition and quenching media on recoverable strain in Cu–Zn–Al alloys

Journal of Materials Research and Technology ◽

10.1016/j.jmrt.2021.03.098 ◽

2021 ◽

Vol 12 ◽

pp. 1368-1379

Author(s):

Vanja Asanović ◽

Dragan Radonjić ◽

Jelena Šćepanović ◽

Darko Vuksanović

Keyword(s):

Chemical Composition ◽

Al Alloys ◽

Recoverable Strain ◽

Quenching Media

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Measurement of the lifetime and quenching rate of metastable 2S muonic helium ions

Physics Letters B ◽

10.1016/0370-2693(84)91152-3 ◽

1984 ◽

Vol 136 (4) ◽

pp. 232-236 ◽

Cited By ~ 42

Author(s):

H.P. von Arb ◽

F. Dittus ◽

H. Heeb ◽

H. Hofer ◽

F. Kottmann ◽

...

Keyword(s):

Helium Ions ◽

Quenching Rate

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Quenching rate constants for reactions of Ar(4p′[1/2]0, 4p[1/2]0, 4p[3/2]2, and 4p[5/2]2) atoms with 22 reagent gases

The Journal of Chemical Physics ◽

10.1063/1.1388037 ◽

2001 ◽

Vol 115 (7) ◽

pp. 3144-3154 ◽

Cited By ~ 82

Author(s):

N. Sadeghi ◽

D. W. Setser ◽

A. Francis ◽

U. Czarnetzki ◽

H. F. Döbele

Keyword(s):

Rate Constants ◽

Quenching Rate

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Quenching-rate dependence of the magnetic and mechanical properties of nanocrystalline Fe/sub 73.5/Cu/sub 1/Nb/sub 3/Si/sub 13.5/B/sub 9/ ribbons obtained by Joule heating

IEEE Transactions on Magnetics ◽

10.1109/20.312303 ◽

1994 ◽

Vol 30 (2) ◽

pp. 461-463 ◽

Cited By ~ 5

Author(s):

P. Allia ◽

P. Tiberto ◽

M. Baricco ◽

M. Knobel ◽

F. Vinai

Keyword(s):

Mechanical Properties ◽

Joule Heating ◽

Rate Dependence ◽

Quenching Rate

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Precipitation during Quenching in 2A97 Aluminum Alloy and the Influences from Grain Structure

Materials ◽

10.3390/ma14112802 ◽

2021 ◽

Vol 14 (11) ◽

pp. 2802

Author(s):

Xiaoya Wang ◽

Jiantang Jiang ◽

Guoai Li ◽

Wenzhu Shao ◽

Liang Zhen

Keyword(s):

Aluminum Alloy ◽

Grain Structure ◽

Water Quenching ◽

Al Alloy ◽

Air Cooling ◽

Quenching Rate ◽

Subsequent Aging ◽

Nucleation Sites ◽

Aging Response ◽

Δ Phase

The quench-induced precipitation and subsequent aging response in 2A97 aluminum alloy was investigated based on the systematic microstructure characterization. Specifically, the influence on precipitation from grain structure was examined. The results indicated the evident influence from the cooling rate of the quenching process. Precipitation of T1 and δ′ phase can hardly occur in the specimen exposed to water quenching while become noticeable in the case of air cooling. The yield strength of 2A97-T6 alloy de-graded by 234 MPa along with a comparable elongation when water quenching was replaced by air cooling. Sub-grains exhibited a much higher sensitivity to the precipitation during quenching. The presence of dislocations in sub-grains promoted the quench-induced precipitation by acting as nucleation sites and enhancing the diffusion of the solute. A quenching rate of 3 °C/s is tolerable for recrystallized grains in 2A97 Al alloy but is inadequate for sub-grains to inhibit precipitation. The study fosters the feasibility of alleviating quench-induced precipitation through cultivating the recrystallization structure in highly alloyed Al–Cu–Li alloys.

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