Studies on the Binary Coalescence Model

Pu, Bingyin; Chen, Donghao

doi:10.1006/jcis.2000.7305

Cited by 12 publications

(5 citation statements)

References 5 publications

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“…The opposite was found for diffusion into the drop. More recently, in agreement with these results, a jump-like coalescence between two captive oil drops in a water phase was observed [26,27] where again a third component was diffusing from the drop to the matrix phase. Both cases of diffusion from the drop into the film and vice versa were investigated theoretically by Saboni et al [28,29].…”

Section: Introductionsupporting

confidence: 59%

Film drainage and interfacial instabilities in polymeric systems with diffuse interfaces

Zdravkov

Peters

Meijer

2006

Journal of Colloid and Interface Science

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Section: Introductionsupporting

confidence: 59%

Film drainage and interfacial instabilities in polymeric systems with diffuse interfaces

Zdravkov

Peters

Meijer

2006

Journal of Colloid and Interface Science

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“…Procedure (2). Stainless steel capillaries of different radii, which directly give the falling drop volume (v f ), were also used in the measurement.…”

Section: Methodsmentioning

confidence: 99%

A Study of the Measurement of Surface and Interfacial Tension by the Maximum Liquid Drop Volume Method

Chen²

2001

Journal of Colloid and Interface Science

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“…Relaxation proceeds very quickly for low viscosity water droplets or simple aqueous salt solution droplets on particle coalescence and previous experimental studies have largely focussed on this regime [72][73][74][75]. Experiments have typically considered the coalescence of inviscid droplets in the diameter range 100 µm to 1 cm [76][77][78][79][80], often in freefalling droplet chains. Recently droplet micro-dispensers were used in tandem with stroboscopic imaging to study the coalescence of smaller particles, 10-20 µm in radius, formed by the head on collision of two microparticles under extremely large shear deformation [81].…”

Section: Measurements Of Particle Surface Tension and Viscositymentioning

confidence: 99%

Probing the micro-rheological properties of aerosol particles using optical tweezers

Power

Reid²

2014

Rep. Prog. Phys.

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The use of optical trapping techniques to manipulate probe particles for performing micro-rheological measurements on a surrounding fluid is well-established. Here, we review recent advances made in the use of optical trapping to probe the rheological properties of trapped particles themselves. In particular, we review observations of the continuous transition from liquid to solid-like viscosity of sub-picolitre supersaturated solution aerosol droplets using optical trapping techniques. Direct measurements of the viscosity of the particle bulk are derived from the damped oscillations in shape following coalescence of two particles, a consequence of the interplay between viscous and surface forces and the capillary driven relaxation of the approximately spheroidal composite particle. Holographic optical tweezers provide a facile method for the manipulation of arrays of particles allowing coalescence to be controllably induced between two micron-sized aerosol particles. The optical forces, while sufficiently strong to confine the composite particle, are several orders of magnitude weaker than the capillary forces driving relaxation. Light, elastically back-scattered by the particle, is recorded with sub-100 ns resolution allowing measurements of fast relaxation (low viscosity) dynamics, while the brightfield image can be used to monitor the shape relaxation extending to times in excess of 1000 s. For the slowest relaxation dynamics studied (particles with the highest viscosity) the presence and line shape of whispering gallery modes in the cavity enhanced Raman spectrum can be used to infer the relaxation time while serving the dual purpose of allowing the droplet size and refractive index to be measured with accuracies of ±0.025% and ±0.1%, respectively. The time constant for the damped relaxation can be used to infer the bulk viscosity, spanning from the dilute solution limit to a value approaching that of a glass, typically considered to be >10(12) Pa s, whilst the frequencies of the normal modes of the oscillations of the particle can be used to infer surface properties. We will review the use of optical tweezers for studying the viscosity of aerosol particles and discuss the potential use of this micro-rheological tool for probing the fundamental concepts of phase, thermodynamic equilibrium and metastability.

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Studies on the Binary Coalescence Model

Cited by 12 publications

References 5 publications

Film drainage and interfacial instabilities in polymeric systems with diffuse interfaces

Film drainage and interfacial instabilities in polymeric systems with diffuse interfaces

A Study of the Measurement of Surface and Interfacial Tension by the Maximum Liquid Drop Volume Method

Probing the micro-rheological properties of aerosol particles using optical tweezers

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