High-molecular-weight (HMW) organic compounds are an important component of atmospheric particles, although their origins, possibly including in situ formation pathways, remain incompletely understood. This study investigates the formation of HMW organic peroxides through reactions involving stabilized Criegee intermediates (SCI’s). The model system is methyl oleate (MO) mixed with dioctyl adip...

The influence of second-generation products on the particle mass yield of β-caryophyllene ozonolysis was systematically tested and quantified. The approach was to vary the relative concentrations of firstand secondgeneration products by adjusting the concentration of ozone while observing changes in particle mass yield. For all wallloss corrected organic particle mass concentrations Morg of thi...

Nanoparticle formation by ozonolysis of inducible plant volatiles J. Joutsensaari, M. Loivamäki, T. Vuorinen, P. Miettinen, A.-M. Nerg, J. K. Holopainen, and A. Laaksonen Department of Applied Physics, University of Kuopio, P.O. Box 1627, FIN-70211 Kuopio, Finland Department of Ecology and Environmental Science, University of Kuopio, P.O. Box 1627, Kuopio FIN-70211, Finland Institute for Meteor...

A review of the ozonolysis of low molecular weight haloalkenes in solution is presented. The reaction products from the tluoroethylenc series are discussed in detail. Secondary ozonides can be obtained from these alkenes although the yields decrease markedly with increased fluorination and diminish t o negligible quantities with C,F,. Compared t o alkylethylenes, a greater variety o f products ...

A degradation mechanism for β-caryophyllene has recently been released as part of version 3.2 of the Master Chemical Mechanism (MCM v3.2), describing the gas phase oxidation initiated by reaction with ozone, OH radicals and NO3 radicals. A detailed overview of the construction methodology is given, within the context of reported experimental and theoretical mechanistic appraisals. The performan...

Ongoing efforts to unravel the origins of the cholesterol 5,6-secosterols (1a and 1b) in biological systems have revealed that the two known chemical routes to these oxysterols, ozonolysis of cholesterol (3) and Hock-cleavage of 5-alpha-hydroperoxycholesterol (4a), are distinguishable based upon the ratio of the hydrazone derivatives (2a and 2b) formed in each case and this ratio offers an insi...

The synthesis of novel periodic mesoporous organosilica (PMO) materials incorporating a mixture of functional monomers (cis- and trans-stilbene-based) and structural monomers has been accomplished. EDX analysis of these materials in combination with HAADF imaging of OsO(4)-stained samples reveals a homogeneous distribution of trans-olefin within the co-condensed aromatic organosilica matrix. Oz...

The lipid moiety of a lipid diphosphate N-acetylglucosamine, an intermediate in glycosylation of proteins, was studied. Ozonolysis of the compound gave evidence for an alpha-saturated isoprene unit. Alkaline hydrolysis of the glycolipid, followed by high-pressure liquid chromatography, showed the presence of a series of polyprenol homologues identical with those isolated directly from Saccharom...

Abstract. Ozonolysis of fatty acid monolayers was studied to understand the fate organic-coated aerosols under realistic atmospheric conditions. Specifically, we investigated effects temperature and salinity on degradation oleic at air–water interface persistence aged surfactant film surface. The presence a residual is importance, as surface affect physical properties droplets because role they...