Changing shapes and implied viscosities of suspended submicron particles

Abstract. The change in shape of atmospherically relevant organic particles is used to estimate the viscosity of the particle material without the need for removal from aerosol suspension. The dynamic shape factors χ of particles produced by α-pinene ozonolysis in a flow tube reactor, under conditions of particle coagulation, were measured while altering the relative humidity (RH) downstream of the flow tube. As relative humidity was increased, the results showed that χ could change from 1.27 to 1.02, corresponding to a transition from aspherical to nearly spherical shapes. The shape change could occur at elevated RH because the organic material had decreased viscosity and was therefore able to flow to form spherical shapes, as favored by the minimization of surface area. Numerical modeling was used to estimate the particle viscosity associated with this flow. Based on particle diameter and RH exposure time, the viscosity dropped from 10(8.7±2.0) to 10(7.0±2.0) Pa s (two sigma) for an increase in RH from

[1]  J. Reid,et al.  Water diffusion in atmospherically relevant α-pinene secondary organic material† †Electronic supplementary information (ESI) available. See DOI: 10.1039/c5sc00685f Click here for additional data file. , 2015, Chemical science.

[2]  A. Laskin,et al.  Reactivity of liquid and semisolid secondary organic carbon with chloride and nitrate in atmospheric aerosols. , 2015, The journal of physical chemistry. A.

[3]  A. Bertram,et al.  Hygroscopic influence on the semisolid-to-liquid transition of secondary organic materials. , 2015, The journal of physical chemistry. A.

[4]  R. J. Thomson,et al.  On surface order and disorder of α-pinene-derived secondary organic material. , 2015, The journal of physical chemistry. A.

[5]  U. Pöschl,et al.  Multiphase chemical kinetics of OH radical uptake by molecular organic markers of biomass burning aerosols: humidity and temperature dependence, surface reaction, and bulk diffusion. , 2015, The journal of physical chemistry. A.

[6]  U. Pöschl,et al.  Size dependence of phase transitions in aerosol nanoparticles , 2015, Nature Communications.

[7]  J. Seinfeld,et al.  Molecular corridors and kinetic regimes in the multiphase chemical evolution of secondary organic aerosol , 2014 .

[8]  D. Knopf,et al.  Multiphase OH oxidation kinetics of organic aerosol: The role of particle phase state and relative humidity , 2014 .

[9]  B. Finlayson‐Pitts,et al.  Integrating phase and composition of secondary organic aerosol from the ozonolysis of α-pinene , 2014, Proceedings of the National Academy of Sciences.

[10]  H. Kjaergaard,et al.  A large source of low-volatility secondary organic aerosol , 2014, Nature.

[11]  K. Lehtinen,et al.  Estimating the Viscosity Range of SOA Particles Based on Their Coalescence Time , 2014 .

[12]  U. Pöschl,et al.  Kinetic limitations in gas-particle reactions arising from slow diffusion in secondary organic aerosol. , 2013, Faraday discussions.

[13]  B. Murray,et al.  Quantifying water diffusion in high-viscosity and glassy aqueous solutions using a Raman isotope tracer method , 2013 .

[14]  E. Robinson,et al.  Organic aerosol mixing observed by single-particle mass spectrometry. , 2013, The journal of physical chemistry. A.

[15]  S. Martin,et al.  Vibrational sum frequency generation spectroscopy of secondary organic material produced by condensational growth from α-pinene ozonolysis. , 2013, The journal of physical chemistry. A.

[16]  John H. Seinfeld,et al.  Size distribution dynamics reveal particle-phase chemistry in organic aerosol formation , 2013, Proceedings of the National Academy of Sciences.

[17]  J. Seinfeld,et al.  Gas-particle partitioning of atmospheric aerosols: interplay of physical state, non-ideal mixing and morphology. , 2013, Physical chemistry chemical physics : PCCP.

[18]  J. Seinfeld,et al.  On the mixing and evaporation of secondary organic aerosol components. , 2013, Environmental science & technology.

[19]  Meng-Xing Tang,et al.  Mapping microbubble viscosity using fluorescence lifetime imaging of molecular rotors , 2013, Proceedings of the National Academy of Sciences.

[20]  A. Robinson,et al.  Time scales for gas-particle partitioning equilibration of secondary organic aerosol formed from alpha-pinene ozonolysis. , 2013, Environmental science & technology.

[21]  J. Reid,et al.  The transition from liquid to solid-like behaviour in ultrahigh viscosity aerosol particles , 2013 .

[22]  A. Bertram,et al.  Viscosity of α-pinene secondary organic material and implications for particle growth and reactivity , 2013, Proceedings of the National Academy of Sciences.

[23]  A. Zelenyuk,et al.  Experimental determination of chemical diffusion within secondary organic aerosol particles. , 2013, Physical chemistry chemical physics : PCCP.

[24]  J. Seinfeld,et al.  Equilibration timescale of atmospheric secondary organic aerosol partitioning , 2012 .

[25]  A. Zelenyuk,et al.  Synergy between secondary organic aerosols and long-range transport of polycyclic aromatic hydrocarbons. , 2012, Environmental science & technology.

[26]  S. Martin,et al.  Phase of atmospheric secondary organic material affects its reactivity , 2012, Proceedings of the National Academy of Sciences.

[27]  P. Sagayaraj,et al.  Introduction of Nanoscience , 2012 .

[28]  S. Martin,et al.  Particle Size Distributions following Condensational Growth in Continuous Flow Aerosol Reactors as Derived from Residence Time Distributions: Theoretical Development and Application to Secondary Organic Aerosol , 2012 .

[29]  D. Dabdub,et al.  Nonequilibrium atmospheric secondary organic aerosol formation and growth , 2012, Proceedings of the National Academy of Sciences.

[30]  Ulrich Pöschl,et al.  Glass transition and phase state of organic compounds: dependency on molecular properties and implications for secondary organic aerosols in the atmosphere. , 2011, Physical chemistry chemical physics : PCCP.

[31]  Ulrich Pöschl,et al.  Gas uptake and chemical aging of semisolid organic aerosol particles , 2011, Proceedings of the National Academy of Sciences.

[32]  I. Riipinen,et al.  Organic condensation: a vital link connecting aerosol formation to cloud condensation nuclei (CCN) concentrations , 2011 .

[33]  B. Luo,et al.  Ultra-slow water diffusion in aqueous sucrose glasses. , 2011, Physical chemistry chemical physics : PCCP.

[34]  S. Martin,et al.  Secondary Organic Material Produced by the Dark Ozonolysis of α-Pinene Minimally Affects the Deliquescence and Efflorescence of Ammonium Sulfate , 2011 .

[35]  C. Cappa.  Evolution of organic aerosol mass spectra upon heating: implications for OA phase and partitioning behavior , 2010 .

[36]  Ulrich Pöschl,et al.  An amorphous solid state of biogenic secondary organic aerosol particles , 2010, Nature.

[37]  S. Martin,et al.  The Dynamic Shape Factor of Sodium Chloride Nanoparticles as Regulated by Drying Rate , 2010 .

[38]  B. Finlayson‐Pitts,et al.  Atmospheric Chemistry , 2010, Proceedings of the National Academy of Sciences.

[39]  A. Zelenyuk,et al.  Morphology of mixed primary and secondary organic particles and the adsorption of spectator organic gases during aerosol formation , 2010, Proceedings of the National Academy of Sciences.

[40]  Y. Kondo,et al.  Measurements of particle masses of inorganic salt particles for calibration of cloud condensation nuclei counters , 2009 .

[41]  John H. Seinfeld,et al.  The formation, properties and impact of secondary organic aerosol: current and emerging issues , 2009 .

[42]  M. Petters,et al.  Towards closing the gap between hygroscopic growth and activation for secondary organic aerosol: Part 1 – Evidence from measurements , 2009 .

[43]  John H. Seinfeld,et al.  Hygroscopicity of secondary organic aerosols formed by oxidation of cycloalkenes, monoterpenes, sesquiterpenes, and related compounds , 2006 .

[44]  A L Robinson,et al.  Coupled partitioning, dilution, and chemical aging of semivolatile organics. , 2006, Environmental science & technology.

[45]  Alla Zelenyuk,et al.  From Agglomerates of Spheres to Irregularly Shaped Particles: Determination of Dynamic Shape Factors from Measurements of Mobility and Vacuum Aerodynamic Diameters , 2006 .

[46]  K. Coakley,et al.  Novel method to classify aerosol particles according to their mass-to-charge ratio—Aerosol particle mass analyser , 1996 .

[47]  C. N. Hewitt,et al.  Emissions of volatile organic compounds from vegetation and the implications for atmospheric chemistry , 1992 .

[48]  E. Kováts,et al.  Density and surface tension of 83 organic liquids , 1981 .

[49]  K. T. Whitby,et al.  Aerosol classification by electric mobility: apparatus, theory, and applications , 1975 .

[50]  D. Hochrainer,et al.  Der dynamische formfaktor nicht-kugelförmiger teilchen als funktion des luftdrucks , 1975 .

[51]  G. Biskos,et al.  Generation and Sizing of Particles for Aerosol-Based Nanotechnology , 2008 .

[52]  Y. Kousaka,et al.  Orientation-Specific Dynamic Shape Factors for Doublets and Triplets of Spheres in the Transition Regime , 1996 .

[53]  H. Hansson,et al.  Dynamic shape factors of sphere aggregates in an electric field and their dependence on the Knudsen number , 1985 .

[54]  Jugal K. Agarwal,et al.  Continuous flow, single-particle-counting condensation nucleus counter , 1980 .

[55]  W. A. Hoppel.  Determination of the aerosol size distribution from the mobility distribution of the charged fraction of aerosols , 1978 .

[56]  J. Frenkel.  Viscous Flow of Crystalline Bodies under the Action of Surface Tension , 1945 .