Two‐dimensional kinetics of binary nucleation in sulfuric acid–water mixtures

A kinetic microphysical modeling approach that describes the formation of volatile aerosols in the presence of organic emissions in near field aircraft emitted plumes at ground level is presented. Our model suggests that self nucleation of organic species, binary nucleation of water-soluble organic vapors with water, and multicomponent nucleation of water-soluble organic vapors with sulfuric acid and water all have very slow nucleation rates. The formation of new homogeneous particles in near field aircraft plumes is thus considered to be driven by binary nucleation of sulfuric acid and water. Volatile organic vapors emitted from aircraft engines primarily contribute to the nucleation process by condensing on existing homogeneous aerosols and only affect the size and the composition (not the number) of the homogeneous aerosols. Our model also shows that under low ambient relative humidity levels or high ambient temperatures, nucleation mode particles are more organic-rich than soot coatings. Organic mass fraction of nucleation mode particles is more sensitive to organic emissions levels compared to that of soot coatings. Ambient temperature and relative humidity were also predicted to affect the nucleation of sulfuric acid–water cores, where higher ambient relative humidity level and lower ambient temperature strongly favor binary sulfuric acid–water nucleation. The effect of ambient conditions on organic fractions was predicted to be relatively insignificant.

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Kinetics of oxidation of α,β-unsaturated aldehydes by quinolinium dichromate

Canadian Journal of Chemistry ◽

10.1139/v03-022 ◽

2003 ◽

Vol 81 (3) ◽

pp. 204-208 ◽

Cited By ~ 4

Author(s):

Girija S Chaubey ◽

Simi Das ◽

Mahendra K Mahanti

Keyword(s):

Acetic Acid ◽

Sulfuric Acid ◽

Kinetic Data ◽

Acid Water ◽

Water Medium ◽

Kinetics Of Oxidation ◽

Unsaturated Aldehydes ◽

Mechanistic Pathway ◽

Acetic Acid Water ◽

Kinetics Of

A series of α,β-unsaturated aldehydes (crotonaldehyde, cinnamaldehyde, acrylaldehyde, and methacrylaldehyde) were oxidized by quinolinium dichromate in sulfuric acid to the corresponding acids in 50% (v/v) acetic acid water medium. The kinetic data have been discussed with reference to the aldehyde hydration equilibria. The kinetic results support a mechanistic pathway proceeding via a rate-determining oxidative decomposition of the chromate ester of the aldehyde hydrate.Key words: kinetics, oxidation, unsaturated aldehydes, quinolinium dichromate.

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Faculty Opinions recommendation of The kinetics of two-dimensional TCR and pMHC interactions determine T-cell responsiveness.

Faculty Opinions – Post-Publication Peer Review of the Biomedical Literature ◽

10.3410/f.2914956.2585054 ◽

2010 ◽

Author(s):

Michael L Dustin ◽

Kaushik Choudhuri

Keyword(s):

T Cell ◽

Two Dimensional ◽

Kinetics Of

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Temperature Effect on the Two-Dimensional Phase Transition Kinetics of Adenine Adsorbed at the Hg Electrode/Aqueous Solution Interface

Collection of Czechoslovak Chemical Communications ◽

10.1135/cccc20031407 ◽

2003 ◽

Vol 68 (8) ◽

pp. 1407-1419 ◽

Cited By ~ 3

Author(s):

Claudio Fontanesi ◽

Roberto Andreoli ◽

Luca Benedetti ◽

Roberto Giovanardi ◽

Paolo Ferrarini

Keyword(s):

Phase Transition ◽

Aqueous Solution ◽

Phase Change ◽

Temperature Effect ◽

Transition Rate ◽

Effect Of Temperature ◽

Two Dimensional ◽

Solution Interface ◽

Phase Transition Kinetics ◽

Kinetics Of

The kinetics of the liquid-like → solid-like 2D phase transition of adenine adsorbed at the Hg/aqueous solution interface is studied. Attention is focused on the effect of temperature on the rate of phase change; an increase in temperature is found to cause a decrease of transition rate.

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