Dynamic behavior of single glycerol droplets in humid air streams

Ray, A.; Johnson, Robert D.; Souyri, A.

doi:10.1021/la00085a024

Cited by 51 publications

(51 citation statements)

References 3 publications

(3 reference statements)

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“…0:6366y þ 0:09591y 2 À 0:06144y 3 0 yo10 0:000008957 þ 0:6333y þ 0:116y 2 À0:08878y 3 þ 0:01033y 4 10 yo180 ;…”

Section: A Rate Equation Modelunclassified

“…The evaporation and growth of water-glycerol microdroplets have been extensively examined in humidity-controlled environments by Ray and coworkers. [3][4][5] In these studies, a single water-glycerol microdroplet is levitated electrodynamically and the size change controlled by the humidity of the chamber is measured highly accurately with Mie scattering experiments.…”

Section: Introductionmentioning

confidence: 99%

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Large spectral tuning of a water–glycerol microdroplet by a focused laser: characterization and modeling

Kiraz

Karadağ

Muradoğlu

2008

Phys. Chem. Chem. Phys.

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Large spectral tuning of a water-glycerol microdroplet standing on a superhydrophobic surface by local heating with a focused infrared laser is studied both experimentally by optical spectroscopy and computationally using a lumped system formulation of the mass and heat transfer between the microdroplet and the chamber. The effects of optical scattering force, chamber humidity, size of microdroplet and laser power on the tuning mechanism are examined. The reversibility of the tuning mechanism is also studied. In spite of its negligibly small volatility compared to that of water, irreversibility is found to be mainly caused by evaporation of glycerol. It is also found that reversibility increases dramatically with the relative water and glycerol humidities, and spectral tuning can be made almost fully reversible when the chamber is saturated with glycerol vapor and the relative water humidity approaches unity. Some hysteresis effects are observed, especially in large microdroplets, and this behavior is attributed to the whisperinggallery mode resonances in laser absorption. The time response of the tuning mechanism is also analyzed both experimentally and computationally. The technique presented can find applications in optical communication systems, and can be used in fundamental studies in cavity quantum electrodynamics and in characterizing liquid aerosols on a surface.

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“…0:6366y þ 0:09591y 2 À 0:06144y 3 0 yo10 0:000008957 þ 0:6333y þ 0:116y 2 À0:08878y 3 þ 0:01033y 4 10 yo180 ;…”

Section: A Rate Equation Modelunclassified

Section: Introductionmentioning

confidence: 99%

Large spectral tuning of a water–glycerol microdroplet by a focused laser: characterization and modeling

Kiraz

Karadağ

Muradoğlu

2008

Phys. Chem. Chem. Phys.

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“…TDMA and the electrodynamic balance (EDB) (Richardson and Spann, 1984;Cohen et al, 1987;Ray et al, 1989;Chan et al, 1992;Munkelwitz, 1993, 1994;Chan and Chan, 2003) are the most commonly used techniques for hygroscopicity measurements and their measurements are often compared. Comprehensive summaries of previous laboratory studies have been presented by Martin (2000) and Kanakidou et al (2005).…”

Section: Introductionmentioning

confidence: 99%

Mass transfer effects in hygroscopic measurements of aerosol particles

Chan

2005

Atmos. Chem. Phys.

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Abstract.The tandem differential mobility analyzer (TDMA) has been widely utilized to measure the hygroscopicity of laboratory-generated and atmospheric submicrometer particles. An important concern in investigating the hygroscopicity of the particles is if the particles have attained equilibrium state in the measurements. We present a literature survey to investigate the mass transfer effects in hygroscopicity measurements. In most TDMA studies, a residence time in the order of seconds is used for humidification (or dehumidification). NaCl and (NH 4 ) 2 SO 4 particles are usually used to verify the equilibrium measurements during this residence time, which is presumed to be sufficient for other particles. There have been observations that not all types of submicrometer particles, including atmospheric particles, attain their equilibrium sizes within this time scale. We recommend that experimentation with different residence times be conducted and that the residence time should be explicitly stated in future TDMA measurements. Mass transfer effects may also exist in the measurements of other properties related to the water uptake of atmospheric particles such as relative humidity dependent light scattering coefficients and cloud condensation nuclei activity.

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“…Several investigators have measured rates of various processes using single droplets in electrical fields (Ray et al 1989) or under radiation pressure (Kaiser et al 1995). Elastic and inelastic (Raman and fluorescence) light scattering techniques have been widely used for in situ physical and chemical characterization of suspended single particles (Chylek et al 1983;Schweiger 1990Schweiger , 1991Fung and Tang 1991;Moritz et al 1997).…”

Section: Introductionmentioning

confidence: 99%

Controlled Generation of Solid Spheroidal Dielectric Microparticles

Sprynchak

Esen

Schweiger

2003

Aerosol Science and Technology

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Our recent research has been pioneering the generation of single solid particles with adjustable eccentricity. This new technique permits the production of particles in the range of 200 µm to 2 mm and an approximate eccentricity of 1:1.2 to 1:1.8 along an axis. Single droplets consisting of multiacrylate monomers were levitated by an ultrasonic levitator and were cured by UV illumination after adjusted eccentricity. For special applications we can produce particles that are attached to a stem (optical fiber), which allows a controlled orientation of the particle. One possible application for such particles is the investigation of light scattering on nonspherical particles.

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Dynamic behavior of single glycerol droplets in humid air streams

Cited by 51 publications

References 3 publications

Large spectral tuning of a water–glycerol microdroplet by a focused laser: characterization and modeling

Large spectral tuning of a water–glycerol microdroplet by a focused laser: characterization and modeling

Mass transfer effects in hygroscopic measurements of aerosol particles

Controlled Generation of Solid Spheroidal Dielectric Microparticles

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