Evaporation characteristics of droplets coated with immiscible layers of nonvolatile liquids

Ray, A.; Devakottai, B.; Souyri, A.; Huckaby, J.L.

doi:10.1021/la00051a019

Cited by 37 publications

(26 citation statements)

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“…From these fits of both the core and shell phase properties (diameter and refractive index), we are now able to proceed in determining important quantitative properties from complex mixed aerosol experiments such as component vapor pressures, hygroscopicities, and diffusion coefficients. This can be done by trapping core-shell droplets whose two phases evaporate at different rates (measuring diffusion of the core through the shell), or have differing hygroscopicity (measuring water diffusion through the shell) (Ray and Tu 2013).…”

Section: Discussion Of Resultsmentioning

confidence: 99%

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Advanced aerosol optical tweezers chamber design to facilitate phase-separation and equilibration timescale experiments on complex droplets

Gorkowski

Beydoun

Aboff

et al. 2016

Aerosol Science and Technology

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The phase-separation of mixed aerosol particles and the resulting morphology plays an important role in determining the interactions of liquid aerosols with their gas-phase environment. We present the application of a new aerosol optical tweezers chamber for delivering a uniformly mixed aerosol flow to the trapped droplet's position for performing experiments that determine the phaseseparation and resulting properties of complex mixed droplets. This facilitates stable trapping when adding additional phases through aerosol coagulation, and reproducible measurements of the droplet's equilibration timescale. We demonstrate the trapping of pure organic carbon droplets, which allows us to study the morphology of droplets containing pure hydrocarbon phases to which a second phase is added by coagulation. A series of experiments using simple compounds are presented to establish our ability to use the cavity enhanced Raman spectra to distinguish between homogeneous single-phase, and phase-separated core-shell or partially engulfed morphologies. The core-shell morphology is distinguished by the pattern of the whispering gallery modes (WGMs) in the Raman spectra where the WGMs are influenced by refraction through both phases. A coreshell optimization algorithm was developed to provide a more accurate and detailed analysis of the WGMs than is possible using the homogeneous Mie scattering solution. The unique analytical capabilities of the aerosol optical tweezers provide a new approach for advancing our understanding of the chemical and physical evolution of complex atmospheric particulate matter, and the important environmental impacts of aerosols on atmospheric chemistry, air quality, human health, and climate change. EDITORThomas Kirchstetter

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Section: Discussion Of Resultsmentioning

confidence: 99%

“…The same droplet characterization can be done in an EDB by measuring the angular scattering of light from the trapped droplet. This EDB setup would retrieve less accurate size and refractive index measurements than the AOT (Ray et al 1991(Ray et al , 1989Miles et al 2012).…”

Section: Introductionmentioning

confidence: 99%

Advanced aerosol optical tweezers chamber design to facilitate phase-separation and equilibration timescale experiments on complex droplets

Gorkowski

Beydoun

Aboff

et al. 2016

Aerosol Science and Technology

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“…The first whispering gallery mode optical cavities were fabricated from dielectric materials, starting with liquid droplets and moving quickly to polymer and silica spheres. [19,21,24,25,29,36,329] In the past couple decades, this range of materials and device geometries has greatly expanded to include crystalline materials as well as a broad range of on-chip geometries. A brief overview of shown in Fig.…”

Section: Dielectric Materials Systemsmentioning

confidence: 99%

Emerging material systems for integrated optical Kerr frequency combs

et al. 2020

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The experimental realization of a Kerr frequency comb represented the convergence of research in materials, physics, and engineering, and this symbiotic relationship continues to underpin efforts in comb innovation today. While the initial focus developing cavity-based frequency combs relied on existing microresonator architectures and classic optical materials, in recent years, this trend has been disrupted. This paper reviews the latest achievements in frequency comb generation using resonant cavities, placing them within the broader historical context of the field. After presenting well-established material systems and device designs, the emerging materials and device architectures are examined. Specifically, the unconventional material systems as well as atypical device designs that have enabled tailored dispersion profiles and improved comb performance are compared to the current state of art. The remaining challenges and future outlook for the field of cavity-based frequency combs is evaluated.

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“…When near-equilibrium conditions are maintained, water activities and deliquescence points of various salts can be measured readily (Cohen et al, 1987a,b,c;Tang and Munkelwitz, 1978Andrews and Larson, 1993). With appropriate precautions, some time-dependent phenomena can also be investigated, such as chemical reactions (Ray et al, 1991;Rassat and Davis, 1992;Foss and Davis, 1994) and droplet growth or evaporation rates (Rube1 and Gentry, 1984;Davis and Ray, 1980;Sageev et al, 1986;Fung et al, 1987;Tang and Munkelwitz, 1991b). The diversity of successful studies attests to the strength of the trapped-particle technique.…”

Section: Lamb Et Almentioning

confidence: 99%

“…Paul and Raether (1955) were among the first to explore electrodynamic means to localize ions and charged particles in space. Subsequent developments employed the principles of nonuniform and time-varying electric fields to trap particles using a wide variety of electrode configurations, including hyperboloidal endcaps above and below a hyperbolic ring (Wuerker et al, 1959a;Davis and Ray, 1980), spherical end electrodes inside a cylinder (Berg et al, 1970), spherical-void electrodes (Arnold and Folan, 1987), and ring-shaped electrodes in various arrangements (Berg et al, 1970;Weiss-Wrana, 1983;Davis et al, 1990;Ray et al, 1991). Of special interest to the evolution of our system is the cubic design developed initiafly by Wuerker et al (1959b) and later by Zaritskii et al (1971).…”

Section: Lamb Et Almentioning

confidence: 99%

The Environmental Control of Individual Aqueous Particles in a Cubic Electrodynamic Levitation System

Lamb

Moyle

Brune

1996

Aerosol Science and Technology

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ABSTRACT. The experimental investigation of aerosol particles often requires special apparatus to ensure that the walls of the system interfere minimally with the measurements. Electrodynamic levitation offers an attractive approach because the particle, when suitably charged, is held away from the system walls by time-dependent electric fields. A new electrodynamic levitation system has been developed expressly for investigating aqueous particles in controlled gaseous environments. A cubic cell was used in conjunction with the carefully controlled introduction of gas into the cell to form a wall-less flow reactor that is ideal for thermodynamic and kinetic studies involving reactive reagents. Unlike most previous cell configurations, the cubic geometry permits three-axis position control of the particle and an ability to measure the gravitational and drag forces simultaneously and independently when the gas flow is horizontally aligned. Preliminary results at room temperature of the mass gained by salt and sulfuric acid particles exposed to various humidities show the basic characteristics of the cell. New results with sulfuric acid particles exposed simultaneously to the vapors of water and nitric acid show that nonvolatile and volatile solutes cause aqueous particles to behave in qualitatively differentways. Such results confirm that cloud formation in the atmosphere should be enhanced by the presence of soluble trace gases under suitably low-temperature conditions.

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Evaporation characteristics of droplets coated with immiscible layers of nonvolatile liquids

Cited by 37 publications

References 0 publications

Advanced aerosol optical tweezers chamber design to facilitate phase-separation and equilibration timescale experiments on complex droplets

Advanced aerosol optical tweezers chamber design to facilitate phase-separation and equilibration timescale experiments on complex droplets

Emerging material systems for integrated optical Kerr frequency combs

The Environmental Control of Individual Aqueous Particles in a Cubic Electrodynamic Levitation System

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