An understanding of the gas/particle-phase partitioning of semivolatile compounds is critical in determining atmospheric aerosol formation processes and growth rates, which in turn affect global climate and human health. The Study of Organic Aerosol at Riverside 2005 campaign was performed to gain a better understanding of the factors responsible for aerosol formation and growth in Riverside, C...

Nitric oxide (NO) oxidation occurs spontaneously in aerobic environments and potentiates the detrimental effects of NO production in the body. This autoxidation reaction can form reactive nitrogen oxygen species, capable of oxidizing and nitrosating proteins, lipids, and DNA, potentially leading to tissue damage, disease, and cancer. Autoxidation of NO in the gas phase is well-characterized, an...

Mixed metal oxides, of the type (KNaM)xP0.11WV0.2NbOx and (NH4)x/(Na)xP0.11WV0.2NbOx, were prepared by hydrothermal synthesis from lacunary heteropolytungstates, [M4(H2O)2(PW9O34)2]10− (MPW9, with M(II) = Co, Cu or Mn) their precursor Na8H(PW9O34) (NaPW9), chemically modified Nb(V) V(IV). For comparison mixed oxides also synthesized using a Keggin heteropolytungstates [PW12O40]3− as tungsten pr...

The phase diagram of surface structures for the model catalyst RuO2(110) in contact with a gas environment of O2 and CO is calculated by density-functional theory and atomistic thermodynamics. Adsorption of the reactants is found to depend crucially on temperature and partial pressures in the gas phase. Assuming that a catalyst surface under steady-state operation conditions is close to a const...

heat transfer phenomena in batch fluidized bed dryer have been studied and analyzed using three phase model including solid phase, interstitial gas phase and bubble phase based on rizzi model. new correlations of heat transfer coefficient to surrounding and convection heat transfer coefficient between solid and interstitial gas are being proposed. in addition, some modifications have been done ...

Highly active phases in carbon monoxide oxidation are known, however they are transient in nature. Here, we determined for the first time the structure of such a highly active phase on platinum nanoparticles in an actual reactor. Unlike generally assumed, the surface of this phase is virtually free of adsorbates and co-exists with carbon-monoxide covered and surface oxidized platinum. Understan...

The water-soluble fractions of aerosol filter samples and cloud water collected during the Whistler Aerosol and Cloud Study (WACS 2010) were analyzed using an Aerodyne aerosol mass spectrometer (AMS). This is the first study to report AMS organic spectra of re-aerosolized cloud water, and to make direct comparison between the AMS spectra of cloud water and aerosol samples collected at the same ...

The temporal evolution of atoms and molecules in a laser-produced plasma was investigated using optical emission spectroscopy for several metal targets (i.e., Al, Ti, Fe, Zr, Nb, Ta). Plasmas from were generated by focusing 1064 nm, 6 ns pulses an Nd:YAG laser. Gas-phase oxidation/plasma chemistry initiated adding O2 (partial pressures up to ≈20%) N2 environment where the total background press...