The Experts below are selected from a list of 1419 Experts worldwide ranked by ideXlab platform
Xiaochen Tang - One of the best experts on this subject based on the ideXlab platform.
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cloud condensation nuclei ccn activity of Aliphatic Amine secondary aerosol
Atmospheric Chemistry and Physics, 2014Co-Authors: Xiaochen Tang, Derek J Price, Eric Praske, Kathleen L Purvisroberts, Philip J SilvaAbstract:Abstract. Aliphatic Amines can form secondary aerosol via oxidation with atmospheric radicals (e.g., hydroxyl radical and nitrate radical). The particle can contain both secondary organic aerosol (SOA) and inorganic salts. The ratio of organic to inorganic materials in the particulate phase influences aerosol hygroscopicity and cloud condensation nuclei (CCN) activity. SOA formed from trimethylAmine (TMA) and butylAmine (BA) reactions with hydroxyl radical (OH) is composed of organic material of low hygroscopicity (single hygroscopicity parameter, κ, ≤ 0.25). Secondary aerosol formed from the tertiary Aliphatic Amine (TMA) with N2O5 (source of nitrate radical, NO3) contains less volatile compounds than the Primary Aliphatic Amine (BA) aerosol. As relative humidity (RH) increases, inorganic Amine salts are formed as a result of acid–base reactions. The CCN activity of the humid TMA–N2O5 aerosol obeys Zdanovskii, Stokes, and Robinson (ZSR) ideal mixing rules. The humid BA + N2O5 aerosol products were found to be very sensitive to the temperature at which the measurements were made within the streamwise continuous-flow thermal gradient CCN counter; κ ranges from 0.4 to 0.7 dependent on the instrument supersaturation (ss) settings. The variance of the measured aerosol κ values indicates that simple ZSR rules cannot be applied to the CCN results from the Primary Aliphatic Amine system. Overall, Aliphatic Amine aerosol systems' κ ranges within 0.2
Philip J Silva - One of the best experts on this subject based on the ideXlab platform.
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cloud condensation nuclei ccn activity of Aliphatic Amine secondary aerosol
Atmospheric Chemistry and Physics, 2014Co-Authors: Xiaochen Tang, Derek J Price, Eric Praske, Kathleen L Purvisroberts, Philip J SilvaAbstract:Abstract. Aliphatic Amines can form secondary aerosol via oxidation with atmospheric radicals (e.g., hydroxyl radical and nitrate radical). The particle can contain both secondary organic aerosol (SOA) and inorganic salts. The ratio of organic to inorganic materials in the particulate phase influences aerosol hygroscopicity and cloud condensation nuclei (CCN) activity. SOA formed from trimethylAmine (TMA) and butylAmine (BA) reactions with hydroxyl radical (OH) is composed of organic material of low hygroscopicity (single hygroscopicity parameter, κ, ≤ 0.25). Secondary aerosol formed from the tertiary Aliphatic Amine (TMA) with N2O5 (source of nitrate radical, NO3) contains less volatile compounds than the Primary Aliphatic Amine (BA) aerosol. As relative humidity (RH) increases, inorganic Amine salts are formed as a result of acid–base reactions. The CCN activity of the humid TMA–N2O5 aerosol obeys Zdanovskii, Stokes, and Robinson (ZSR) ideal mixing rules. The humid BA + N2O5 aerosol products were found to be very sensitive to the temperature at which the measurements were made within the streamwise continuous-flow thermal gradient CCN counter; κ ranges from 0.4 to 0.7 dependent on the instrument supersaturation (ss) settings. The variance of the measured aerosol κ values indicates that simple ZSR rules cannot be applied to the CCN results from the Primary Aliphatic Amine system. Overall, Aliphatic Amine aerosol systems' κ ranges within 0.2
Derek J Price - One of the best experts on this subject based on the ideXlab platform.
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cloud condensation nuclei ccn activity of Aliphatic Amine secondary aerosol
Atmospheric Chemistry and Physics, 2014Co-Authors: Xiaochen Tang, Derek J Price, Eric Praske, Kathleen L Purvisroberts, Philip J SilvaAbstract:Abstract. Aliphatic Amines can form secondary aerosol via oxidation with atmospheric radicals (e.g., hydroxyl radical and nitrate radical). The particle can contain both secondary organic aerosol (SOA) and inorganic salts. The ratio of organic to inorganic materials in the particulate phase influences aerosol hygroscopicity and cloud condensation nuclei (CCN) activity. SOA formed from trimethylAmine (TMA) and butylAmine (BA) reactions with hydroxyl radical (OH) is composed of organic material of low hygroscopicity (single hygroscopicity parameter, κ, ≤ 0.25). Secondary aerosol formed from the tertiary Aliphatic Amine (TMA) with N2O5 (source of nitrate radical, NO3) contains less volatile compounds than the Primary Aliphatic Amine (BA) aerosol. As relative humidity (RH) increases, inorganic Amine salts are formed as a result of acid–base reactions. The CCN activity of the humid TMA–N2O5 aerosol obeys Zdanovskii, Stokes, and Robinson (ZSR) ideal mixing rules. The humid BA + N2O5 aerosol products were found to be very sensitive to the temperature at which the measurements were made within the streamwise continuous-flow thermal gradient CCN counter; κ ranges from 0.4 to 0.7 dependent on the instrument supersaturation (ss) settings. The variance of the measured aerosol κ values indicates that simple ZSR rules cannot be applied to the CCN results from the Primary Aliphatic Amine system. Overall, Aliphatic Amine aerosol systems' κ ranges within 0.2
Eric Praske - One of the best experts on this subject based on the ideXlab platform.
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cloud condensation nuclei ccn activity of Aliphatic Amine secondary aerosol
Atmospheric Chemistry and Physics, 2014Co-Authors: Xiaochen Tang, Derek J Price, Eric Praske, Kathleen L Purvisroberts, Philip J SilvaAbstract:Abstract. Aliphatic Amines can form secondary aerosol via oxidation with atmospheric radicals (e.g., hydroxyl radical and nitrate radical). The particle can contain both secondary organic aerosol (SOA) and inorganic salts. The ratio of organic to inorganic materials in the particulate phase influences aerosol hygroscopicity and cloud condensation nuclei (CCN) activity. SOA formed from trimethylAmine (TMA) and butylAmine (BA) reactions with hydroxyl radical (OH) is composed of organic material of low hygroscopicity (single hygroscopicity parameter, κ, ≤ 0.25). Secondary aerosol formed from the tertiary Aliphatic Amine (TMA) with N2O5 (source of nitrate radical, NO3) contains less volatile compounds than the Primary Aliphatic Amine (BA) aerosol. As relative humidity (RH) increases, inorganic Amine salts are formed as a result of acid–base reactions. The CCN activity of the humid TMA–N2O5 aerosol obeys Zdanovskii, Stokes, and Robinson (ZSR) ideal mixing rules. The humid BA + N2O5 aerosol products were found to be very sensitive to the temperature at which the measurements were made within the streamwise continuous-flow thermal gradient CCN counter; κ ranges from 0.4 to 0.7 dependent on the instrument supersaturation (ss) settings. The variance of the measured aerosol κ values indicates that simple ZSR rules cannot be applied to the CCN results from the Primary Aliphatic Amine system. Overall, Aliphatic Amine aerosol systems' κ ranges within 0.2
Jin Z Zhang - One of the best experts on this subject based on the ideXlab platform.
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characterization of Primary Amine capped cdse znse and zns quantum dots by ft ir determination of surface bonding interaction and identification of selective desorption
Langmuir, 2011Co-Authors: Jason K Cooper, Alexandra M Franco, Sheraz Gul, Carley Corrado, Jin Z ZhangAbstract:Surface ligands of semiconductor quantum dots (QDs) critically influence their properties and functionalities. It is of strong interest to understand the structural characteristics of surface ligands and how they interact with the QDs. Three quantum dot (QD) systems (CdSe, ZnSe, and ZnS) with Primary Aliphatic Amine capping ligands were characterized primarily by FT-IR spectroscopy as well as NMR, UV–vis, and fluorescence spectroscopy, and by transmission electron microscopy (TEM). Representative Primary Amines ranging from 8 to 16 carbons were exAmined in the vapor phase, KBr pellet, and neat and were compared to the QD samples. The strongest hydrogen-bonding effects of the adsorbed ligands were observed in CdSe QDs with the weakest observed in ZnS QDs. There was an observed splitting of the N–H scissoring mode from 1610 cm–1 in the neat sample to 1544 and 1635 cm–1 when bound to CdSe QDs, which had the largest splitting of this type. The splitting is attributed to Amine ligands bound to either Cd or Se ...