PMID- 31904037
OWN - NLM
STAT- MEDLINE
DCOM- 20200317
LR  - 20200317
IS  - 2050-7895 (Electronic)
IS  - 2050-7887 (Linking)
VI  - 22
IP  - 2
DP  - 2020 Feb 26
TI  - Integrated experimental and theoretical approach to probe the synergistic effect 
      of ammonia in methanesulfonic acid reactions with small alkylamines.
PG  - 305-328
LID - 10.1039/c9em00431a [doi]
AB  - While new particle formation events have been observed worldwide, our fundamental 
      understanding of the precursors remains uncertain. It has been previously shown 
      that small alkylamines and ammonia (NH3) are key actors in sub-3 nm particle 
      formation through reactions with acids such as sulfuric acid (H2SO4) and 
      methanesulfonic acid (CH3S(O)(O)OH, MSA), and that water also plays a role. 
      Because NH3 and amines co-exist in air, we carried out combined experimental and 
      theoretical studies examining the influence of the addition of NH3 on particle 
      formation from the reactions of MSA with methylamine (MA) and trimethylamine 
      (TMA). Experiments were performed in a 1 m flow reactor at 1 atm and 296 K. 
      Measurements using an ultrafine condensation particle counter (CPC) and a 
      scanning mobility particle sizer (SMPS) show that new particle formation was 
      systematically enhanced upon simultaneous addition of NH3 to the MSA + amine 
      binary system, with the magnitude depending on the amine investigated. For the 
      MSA + TMA reaction system, the addition of NH3 at ppb concentrations produced a 
      much greater effect (i.e. order of magnitude more particles) than the addition of 
       approximately 12 000 ppm water (corresponding to  approximately 45-50% relative humidity). The effect of NH3 
      on the MSA + MA system, which is already very efficient in forming particles on 
      its own, was present but modest. Calculations of energies, partial charges and 
      structures of small cluster models of the multi-component particles likewise 
      suggest synergistic effects due to NH3 in the presence of MSA and amine. The 
      local minimum structures and the interactions involved suggest mechanisms for 
      this effect.
FAU - Perraud, Veronique
AU  - Perraud V
AUID- ORCID: 0000-0003-1247-9787
AD  - Department of Chemistry, University of California, Irvine, CA 92697, USA. 
      bgerber@uci.edu bjfinlay@uci.edu.
FAU - Xu, Jing
AU  - Xu J
AUID- ORCID: 0000-0001-5558-6908
AD  - Department of Optical Engineering, Zhejiang A&F University, Lin'an 311300, 
      Zhejiang, China.
FAU - Gerber, R Benny
AU  - Gerber RB
AUID- ORCID: 0000-0001-8468-0258
AD  - Department of Chemistry, University of California, Irvine, CA 92697, USA. 
      bgerber@uci.edu bjfinlay@uci.edu and Institute of Chemistry, The Fritz Haber 
      Research Center, The Hebrew University of Jerusalem, Jerusalem 91904, Israel.
FAU - Finlayson-Pitts, B J
AU  - Finlayson-Pitts BJ
AUID- ORCID: 0000-0003-4650-168X
AD  - Department of Chemistry, University of California, Irvine, CA 92697, USA. 
      bgerber@uci.edu bjfinlay@uci.edu.
LA  - eng
PT  - Journal Article
PL  - England
TA  - Environ Sci Process Impacts
JT  - Environmental science. Processes & impacts
JID - 101601576
RN  - 0 (Amines)
RN  - 0 (Mesylates)
RN  - 059QF0KO0R (Water)
RN  - 12EH9M7279 (methanesulfonic acid)
RN  - 7664-41-7 (Ammonia)
SB  - IM
MH  - Amines
MH  - *Ammonia/chemistry
MH  - *Mesylates/chemistry
MH  - Water
EDAT- 2020/01/07 06:00
MHDA- 2020/03/18 06:00
CRDT- 2020/01/07 06:00
PHST- 2020/01/07 06:00 [pubmed]
PHST- 2020/03/18 06:00 [medline]
PHST- 2020/01/07 06:00 [entrez]
AID - 10.1039/c9em00431a [doi]
PST - ppublish
SO  - Environ Sci Process Impacts. 2020 Feb 26;22(2):305-328. doi: 10.1039/c9em00431a.