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New and Emerging Technologies of Societal Relevance: Impact on Air Quality and Climate. CHEM-ING-TECH 2016. [DOI: 10.1002/cite.201650083] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Kinetics, Energetics and OH Product Yield of the Reaction CH3O + O(3P) → CH3O*2→ Products. ACTA ACUST UNITED AC 2014. [DOI: 10.1002/bbpc.19870910705] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Reaktionen von Wasserstoffatomen mit ungesättigten C3-Kohlenwasserstoffen. I. Die Reaktion von H-Atomen mit Propylen. ACTA ACUST UNITED AC 2014. [DOI: 10.1002/bbpc.19720760514] [Citation(s) in RCA: 81] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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A Combined Flash Photolysis/Shock-Tube Study of the Absolute Rate Constants for Reactions of the Hydroxyl Radical with CH4and CF3H around 1300 K. ACTA ACUST UNITED AC 2014. [DOI: 10.1002/bbpc.197800074] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Physicochemical characterization of nanoparticles and their behavior in the biological environment. Phys Chem Chem Phys 2014; 16:15053-67. [DOI: 10.1039/c4cp00058g] [Citation(s) in RCA: 76] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Whilst the physical and chemical properties of nanoparticles in the gas or idealized solvent phase can nowadays be characterized with sufficient accuracy, this is no longer the case for particles in the presence of a complex biological environment.
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Direct investigations of reactions of 2-butoxy radicals using laser pulse initiated oxidation: Reaction with O2 and unimolecular decomposition at 293 K and 50 mbar. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/bbpc.19981021214] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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LIF spectra of n-propoxy and i-propoxy radicals and kinetics of their reactions with O2 and NO2. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/bbpc.19981020502] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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A laser flash photolysis study of the decay of Cl-Atoms and Cl2− radical anions in aqueous solution at 298 K. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/bbpc.19971011217] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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LIF detection of the IO-radical and kinetics of the reactions I+O3 → IO+O2, O(3P)+I2 → IO+I, O(3P)+CH3I → IO+CH3 and O(3P)+CF3I → IO+CF3 in the temperature range 230 to 310 K. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/bbpc.19981020503] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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12
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Rate measurements for the reactions H + I2 → HI + I and H + HI → H2 + I by Lyman-α-fluorescence. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/bbpc.19790830603] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Time Resolved Studies of Intermediate Products in the Oxidation of HCFC 141b (CFCl2CH3) and HCFC 142 b (CF2ClCH3). ACTA ACUST UNITED AC 2010. [DOI: 10.1002/bbpc.19961000504] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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FTIR-Spectroscopic Study of Reactions of FCO and FC(O)OO Radicals in the Presence of O2 and NO2. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/bbpc.19961000408] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Rate and mechanism of the atmospheric degradation of 2H-heptafluoropropane (HFC-227). ACTA ACUST UNITED AC 2010. [DOI: 10.1002/bbpc.19940980202] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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A Novel Laser-Based Technique for the Time-Resolved Study of Integrated Hydrocarbon Oxidation Mechanisms. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/bbpc.19920960340] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Rate and Mechanism of the Atmospheric Degradation of 1,1,1,2-Tetrafluoroethane (HFC-134a). ACTA ACUST UNITED AC 2010. [DOI: 10.1002/bbpc.19961000503] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Laser Photolysis - LIF Kinetic Studies of the Reactions of CH3O and CH2CHO with O2 between 300 and 500 K. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/bbpc.19850890346] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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A cw Laser Absorption Study of the Reactions of Phenyl Radicals with NO, NO2, O2 and Selected Organics Between 298-404 K. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/bbpc.19890931205] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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26
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Pressure and Temperature Dependence of the Reaction ClO + NO2(+ N2) → ClONO2(+ N2). ACTA ACUST UNITED AC 2010. [DOI: 10.1002/bbpc.19840880417] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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27
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Direct Detection of Hydroxy-Cyclohexadienyl in the Gas Phase by cw-UV-Laser Absorption. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/bbpc.19850890347] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Kinetics of the Reactions of OH Radicals with Some Halocarbons (CHClF2, CH2ClF, CH2ClCF3, CH3CClF2, CH3CHF2) in the Temperature Range 260-370 K. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/bbpc.19780821117] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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30
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Rate Measurements for the Reactions H + NO2 → OH + NO and H + NOCl → HCl + NO by Lyman-α Fluorescence. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/bbpc.19760801018] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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The Recombination Reaction between Hydroxyl Radicals and Nitrogen Dioxide. OH + NO2 + M (= He, CO2) in the Temperature Range 213-300 K. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/bbpc.19770810107] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Corrigendum to "A new modeling tool for the diffusion of gases in ice or amorphous binary mixture in the polar stratosphere and the upper troposphere" published in Atmos. Chem. Phys., 10, 3099–3105, 2010. ATMOSPHERIC CHEMISTRY AND PHYSICS 2010; 10:3333-3333. [DOI: 10.5194/acp-10-3333-2010] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
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A new modeling tool for the diffusion of gases in ice or amorphous binary mixture in the polar stratosphere and the upper troposphere. ATMOSPHERIC CHEMISTRY AND PHYSICS 2010; 10:3099-3105. [DOI: 10.5194/acp-10-3099-2010] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Abstract. To elaborate stratospheric ozone depletion processes, measurements of diffusion coefficients of selected gas phase molecules (i.e. HCl, CH3OH, HCOOH and CH3COOH; Katsambas et al., 1997; Kondratyev and Varotsos, 1996; Varotsos et al., 1994, 1995) in ice in the temperature range 170–195 K have been analyzed with respect to the mechanisms and rates of diffusion. It is argued that the diffusion in ice of these compounds is governed by a vacancy – mediated mechanism, i.e. H2O vacancies are required to diffuse to lattice sites adjacent to these compounds prior to the diffusion of the corresponding molecule into the vacancy sites. In addition, we show that the diffusion coefficients of these compounds exhibit a specific interconnection, i.e. a linear relationship holds between the logarithm of the pre-exponential factor, Do, and the activation energy E. The physical meaning of this interconnection is discussed.
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The influence of proteins on the dispersability and cell-biological activity of silver nanoparticles. ACTA ACUST UNITED AC 2010. [DOI: 10.1039/b914875b] [Citation(s) in RCA: 173] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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37
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Adaptation an den Klimawandel - Eine Herausforderung an Wissenschaft und Technik. CHEM-ING-TECH 2009. [DOI: 10.1002/cite.200950636] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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38
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Manipulation und Reaktion von Mikrotröpfchen in optischen Fallen. CHEM-ING-TECH 2009. [DOI: 10.1002/cite.200950559] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Deliquescence behaviour and crystallisation of ternary ammonium sulfate/dicarboxylic acid/water aerosols. Phys Chem Chem Phys 2009; 11:7976-84. [DOI: 10.1039/b905007h] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Acetone photolysis at 248 nm revisited: pressure dependence of the CO and CO2 quantum yields. Phys Chem Chem Phys 2009; 11:8522-31. [DOI: 10.1039/b906751e] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Dynamics and mass accommodation of HCl molecules on sulfuric acid–water surfaces. Phys Chem Chem Phys 2009; 11:8048-55. [DOI: 10.1039/b904629a] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
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Deliquescence behaviour of single levitated ternary salt/carboxylic acid/water microdroplets. Faraday Discuss 2008; 137:265-78; discussion 297-318. [DOI: 10.1039/b702651j] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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44
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Erfordernisse der CO2-Reduktion unter der Zielsetzung einer Plus-2 Grad-Gesellschaft. CHEM-ING-TECH 2007. [DOI: 10.1002/cite.200750419] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Acetone Adsorption on Ice Surfaces in the Temperature Range T = 190−220 K: Evidence for Aging Effects Due to Crystallographic Changes of the Adsorption Sites. J Phys Chem A 2006; 110:8098-107. [PMID: 16805496 DOI: 10.1021/jp0563742] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The rate and thermodynamics of the adsorption of acetone on ice surfaces have been studied in the temperature range T = 190-220 K using a coated-wall flow tube reactor (CWFT) coupled with QMS detection. Ice films of 75 +/- 25 microm thickness were prepared by coating the reactor using a calibrated flow of water vapor. The rate coefficients for adsorption and desorption as well as adsorption isotherms have been derived from temporal profiles of the gas phase concentration at the exit of the flow reactor together with a kinetic model that has recently been developed in our group to simulate reversible adsorption in CWFTs (Behr, P.; Terziyski, A.; Zellner, R. Z. Phys. Chem. 2004, 218, 1307-1327). It is found that acetone adsorption is entirely reversible; the adsorption capacity, however, depends on temperature and decreases with the age of the ice film. The aging effect is most pronounced at low acetone gas-phase concentrations (< or = 2.0 x 10(11) molecules/cm(3)) and at low temperatures. Under these conditions, acetone is initially adsorbed with a high rate and high surface coverage that, upon aging, both become lower. This effect is explained by the existence of initially two adsorption sites (1) and (2), which differ in nature and number density and for which the relative fractions change with time. Using two-site dynamic modeling, the rate coefficients for adsorption (k(ads)) and desorption (k(des)) as well as the Langmuir constant (K(L)) and the maximum number of adsorption sites (c(s,max)), as obtained for the adsorption of acetone on sites of types (1) and (2) in the respective temperature range, are k(ads)(1) = 3.8 x 10(-14) T(0.5) cm(3) s(-1), k(des)(1) = 4.0 x 10(11) exp(-5773/T) s(-1), K(L) (1) = 6.3 x 10(-25) exp(5893/T) cm(3), c(s,max)(1) < or = 10(14) cm(-2) and k(ads)(2) = 2.9 x 10(-15) T(0.5) cm(3) s(-1), k(des)(2) = 1.5 x 10(7) exp(-3488/T) s(-1), K(L)(2) = 5.0 x 10(-22) exp(3849/T) cm(3), c(s,max)(2) = 6.0 x 10(14) cm(-2), respectively. On the basis of these results, the adsorption of acetone on aged ice occurs exclusively on sites of type (2). Among the possible explanations for the time-dependent two-site adsorption behavior, i.e., crystallographic differences, molecular or engraved microstructures, or a mixture of the two, we tentatively accept the former, i.e., that the two adsorption sites correspond to cubic (1, I(c)) and hexagonal (2, I(h)) sites. The temporal change of I(c) to I(h) and, hence, the time constants of aging are consistent with independent information in the literature on these phase changes.
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Investigations of the hygroscopic properties of ammonium sulfate and mixed ammonium sulfate and glutaric acid micro droplets by means of optical levitation and Raman spectroscopy. Phys Chem Chem Phys 2006; 8:2759-64. [PMID: 16763709 DOI: 10.1039/b604439e] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In the presented work an optical levitation technique performed by means of a focused laser beam, Mie and Raman spectroscopy have been utilized for measuring hygroscopic growth curves and composition of laboratory generated single ammonium sulfate (AS) and internally mixed ammonium sulfate-glutaric acid (GA) droplets in the micrometer range. The generated particles have been found to immediately supersaturate (above 45wt% for AS) at 297 K after capturing in the laser beam. Further increase of the relative humidity (RH) up to 85% does not dilute the droplets under the saturation point. A spontaneous hygroscopic growth takes place at 73.5-78% RH for pure AS. The particle grows with an average factor of 1.62 at the deliquescence relative humidity (DRH). Efflorescence of AS occurs at 43% RH with a corresponding concentration of more than 85wt%. Independent of the mixing ratios in ranges 25/75, 50/50, 75/25% AS/GA mixed particles don't exist as a metastable supersaturated solution droplets in the 35-85% RH range. Instead of growing with increasing relative humidity internally mixed particles build up a solid crystalline layer on the surface. This crystalline phase is not further influenced by ambient relative humidities.
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Direct measurements of the OH and NO2 evolutions in pulsed photo-oxidation studies of hydrocarbons. J Photochem Photobiol A Chem 2005. [DOI: 10.1016/j.jphotochem.2005.08.011] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Efficacy and safety of mitoxantrone in multiple sclerosis: a retrospective analysis of 105 patients. AKTUELLE NEUROLOGIE 2005. [DOI: 10.1055/s-2005-919397] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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