The role of dynamic surface tension in cloud droplet activation

2013 ◽  
Author(s):  
Markus D. Petters ◽  
Sarah R. Suda ◽  
Sara I. Christensen
Keyword(s):  
Surface Tension ◽  
Cloud Droplet ◽  
Dynamic Surface Tension ◽  
Dynamic Surface ◽  
Droplet Activation

Role of electrostatic interactions in the adsorption kinetics of nanoparticles at fluid–fluid interfaces

2016 ◽  
Vol 18 (7) ◽  
pp. 5499-5508 ◽  
Author(s):  
Venkateshwar Rao Dugyala ◽  
Jyothi Sri Muthukuru ◽  
Ethayaraja Mani ◽  
Madivala G. Basavaraj
Keyword(s):  
Surface Tension ◽  
Adsorption Kinetics ◽  
Electrostatic Interaction ◽  
Electrostatic Interactions ◽  
Dynamic Surface Tension ◽  
Nano Particles ◽  
Fluid Interfaces ◽  
Dynamic Surface ◽  
Kinetics Of

The dynamic surface tension measurements are used to elucidate the contribution of electrostatic interaction energy barriers for the adsorption of nano-particles to the interfaces.

Role of dynamic surface tension in slide coating

1991 ◽  
Vol 30 (3) ◽  
pp. 453-461 ◽  
Author(s):  
Jose E. Valentini ◽  
William R. Thomas ◽  
Paul Sevenhuysen ◽  
Tsung S. Jiang ◽  
Hae O. Lee ◽  
...  
Keyword(s):  
Surface Tension ◽  
Dynamic Surface Tension ◽  
Dynamic Surface ◽  
Slide Coating

The role of dynamic surface tension in air assist atomization

1995 ◽  
Vol 7 (1) ◽  
pp. 24-33 ◽  
Author(s):  
Uri Shavit ◽  
Norman Chigier
Keyword(s):  
Surface Tension ◽  
Dynamic Surface Tension ◽  
Dynamic Surface

scholarly journals Technical Note: The Role of Evolving Surface Tension in the Formation of Cloud Droplets

2018 ◽  
Author(s):  
James F. Davies ◽  
Andreas Zuend ◽  
Kevin R. Wilson
Keyword(s):  
Surface Tension ◽  
Pure Water ◽  
Cloud Droplet ◽  
Technical Note ◽  
Activation Mechanism ◽  
Activation Process ◽  
Cloud Droplets ◽  
Evolving Surface ◽  
Droplet Activation

Abstract. The role of surface tension (σ) in cloud droplet activation has long been ambiguous. Recent studies have reported observations attributed to the effects of an evolving surface tension in the activation process. However, adoption of a surface-mediated activation mechanism has been slow and many studies continue to neglect the composition-dependence of aerosol/droplet surface tension, using instead a value equal to the surface tension of pure water (σw). In this technical note, we clearly describe the fundamental role of surface tension in the activation of multicomponent aerosol particles into cloud droplets. It is demonstrated that the effects of surface tension in the activation process depend primarily on the evolution of surface tension with droplet size, typically varying in the range 0.5σw ≲ σ ≤ σw due to the partitioning of organic species with a high surface affinity. We go on to report some recent laboratory observations that exhibit behavior that may be associated with surface tension effects, and propose a measurement coordinate that will allow surface tension effects to be better identified using standard atmospheric measurement techniques. However, interpreting observations using theory based on surface film and liquid-liquid phase separation models remains a challenge. Our findings highlight the need for experimental measurements that better reveal the role of composition-dependent surface tensions, critical for advancing predictive theories and parameterizations of cloud droplet activation.

scholarly journals Dynamic Surface Tension of Aqueous Solutions of Ionic Surfactants: Role of Electrostatics

Langmuir ◽  
2011 ◽  
Vol 27 (3) ◽  
pp. 1009-1014 ◽  
Author(s):  
Hernán Ritacco ◽  
Dominique Langevin ◽  
Haim Diamant ◽  
David Andelman
Keyword(s):  
Surface Tension ◽  
Aqueous Solutions ◽  
Dynamic Surface Tension ◽  
Ionic Surfactants ◽  
Dynamic Surface

scholarly journals Technical note: The role of evolving surface tension in the formation of cloud droplets

2019 ◽  
Vol 19 (5) ◽  
pp. 2933-2946 ◽  
Author(s):  
James F. Davies ◽  
Andreas Zuend ◽  
Kevin R. Wilson
Keyword(s):  
Surface Tension ◽  
Pure Water ◽  
Cloud Droplet ◽  
Technical Note ◽  
Activation Mechanism ◽  
Activation Process ◽  
Cloud Droplets ◽  
Evolving Surface ◽  
Droplet Activation

Abstract. The role of surface tension (σ) in cloud droplet activation has long been ambiguous. Recent studies have reported observations attributed to the effects of an evolving surface tension in the activation process. However, the adoption of a surface-mediated activation mechanism has been slow and many studies continue to neglect the composition dependence of aerosol–droplet surface tension, using instead a value equal to the surface tension of pure water (σw). In this technical note, we clearly describe the fundamental role of surface tension in the activation of multicomponent aerosol particles into cloud droplets. It is demonstrated that the effects of surface tension in the activation process depend primarily on the evolution of surface tension with droplet size, typically varying in the range 0.5σw≲σ≤σw due to the partitioning of organic species with a high surface affinity. We go on to report some recent laboratory observations that exhibit behavior that may be associated with surface tension effects and propose a measurement coordinate that will allow surface tension effects to be better identified using standard atmospheric measurement techniques. Unfortunately, interpreting observations using theory based on surface film and liquid–liquid phase separation models remains a challenge. Our findings highlight the need for experimental measurements that better reveal the role of composition-dependent surface tensions, critical for advancing predictive theories and parameterizations of cloud droplet activation.

Adhesion of spray droplets to foliage: The role of dynamic surface tension and advantages of organosilicone surfactants

1993 ◽  
Vol 38 (2-3) ◽  
pp. 237-245 ◽  
Author(s):  
Peter J. G. Stevens ◽  
Mark O. Kimberley ◽  
Dennis S. Murphy ◽  
George A. Policello
Keyword(s):  
Surface Tension ◽  
Dynamic Surface Tension ◽  
Dynamic Surface ◽  
Spray Droplets

Modelling hygroscopicity-induced gas–aerosol partitioning, organic surface enrichment and cloud droplet formation

2020 ◽  
Author(s):  
Andreas Zuend ◽  
Kyle Gorkowski
Keyword(s):  
Surface Tension ◽  
Phase Separation ◽  
Cloud Droplet ◽  
Organic Aerosol ◽  
Chem Phys ◽  
Computationally Efficient ◽  
Volatile Organic ◽  
Reduced Complexity ◽  
Droplet Activation

<p>The interactions among low and semi-volatile organic compounds, water and other inorganic components within fine-mode aerosols are complex. We show that understanding several features of this complexity can be important in the context of phase separation, a particle surface composition enriched by organics and for related cloud droplet activation modeling.  <br>Context: oxidized organic compounds contribute to the particle hygroscopicity, yet typically to a lesser extent than dissolved inorganic ions. The overall hygroscopicity of aerosols in turn greatly affects their water uptake in an air parcel experiencing increasing relative humidity. The mechanism acts directly in terms of adding water mass, as well as indirectly via a hygroscopicity-induced feedback leading to enhanced gas–to–particle partitioning of semi-volatile organic components alongside a re-equilibration of the aerosol with inorganic acids, ammonia and further water uptake. Furthermore, non-ideal mixing may induce liquid–liquid phase separation, often leading to an organic-rich phase of relatively low surface tension surrounding an inorganic-rich particle core. This phase separation effect and related surface enhancements of organic component concentrations affect not only the morphology but also the potential for near-surface chemical reactions, as well as the thermodynamics controlling an aerosol particle’s activation into a cloud droplet at realistic water vapour supersaturations.  New experimental techniques and field observations over the past few years have encouraged model development for an improved representation of these processes on a detailed level (see, e.g., discussion in Davies et al., 2019). This has led to a better understanding of the potential role of organic aerosol compounds spanning a range of polarities and an associated evolution of surface tension prior to the cloud condensation nucleus (CCN) activation point. While detailed process models still lack finer details to fully capture these composition and phase effects reliably and predictively, important challenges exist in translating these mechanisms into computationally efficient and feasible reduced-complexity models of use for air quality and chemistry-climate modelling.<br>In this presentation, we will outline the current state of a relatively complete process-level aerosol thermodynamics model based on AIOMFAC and introduce key features of a recently developed reduced-complexity organic aerosol model that accounts for water content and hygroscopicity-induced feedbacks on composition (Gorkowski et al., 2019). A key advantage of the reduced-complexity model is its ability to use only input typically known from field measurements or data available in large-scale air quality models. Our approach is compatible with a volatility basis set approach and allows for extending it by adding a realistic humidity dependence. In addition, we account for phase separation and related effects on surface tension in a simplified, computationally efficient manner. This approach and its results for aerosol hygroscopicity and cloud droplet activation will be discussed.</p><p>References:</p><p>Davies, J. F., Zuend, A., and Wilson, K. R.: Technical note: The role of evolving surface tension in the formation of cloud droplets, Atmos. Chem. Phys., 19, 2933–2946, doi:10.5194/acp-19-2933-2019, 2019.</p><p>Gorkowski, K., Preston, T. C., and Zuend, A.: Relative-humidity-dependent organic aerosol thermodynamics via an efficient reduced-complexity model, Atmos. Chem. Phys., 19, 13383–13407, 10.5194/acp-19-13383-2019, 2019.</p>

Sign in / Sign up

Export Citation Format

Share Document