Measuring the Mutual Diffusion Coefficient for Dodecyl Acrylate in Low Molecular Weight Poly(dodecyl acrylate) with Laser Line Deflection (Wiener's Method) and the Fluorescence of Pyrene

Antrim, Daniel; Bunton, Patrick; Lewis, Lydia L.; Zoltowski, Brian D.

doi:10.1021/jp0502609

Cited by 17 publications

(15 citation statements)

References 22 publications

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“…Figure 4 illustrates a variable transition zone. Figure 5 presents the fluid displacement and the streamlines after 1,000 s for a transition zone width increasing from 0.2-5 mm and with k = 2 × 10 −9 N. In all cases the diffusion coefficient was fixed at 10 −6 cm 2 s −1 , which was experimentally determined by Antrim et al (2005).…”

Section: Variable Transition Zone Widthmentioning

confidence: 99%

Numerical Simulations of Convection Induced by Korteweg Stresses in a Miscible Polymer–Monomer System: Effects of Variable Transport Coefficients, Polymerization Rate and Volume Changes

Chekanov

Wyatt

Bessonov

et al. 2008

Microgravity Sci. Technol

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We modeled a miscible polymer-monomer system with a sharp transition zone separating the two fluids to determine if convection analogous to Marangoni convection in immiscible fluids could occur because of thermal and concentration gradients. We considered three cases: with a temperature gradient along the transition zone, with a variable transition zone width, and one with a gradient in the conversion of polymerization. Using the Navier-Stokes equations with an additional term, the Korteweg stress term arising from non-local interactions in the fluid, we demonstrated with realistic parameters that measurable fluid flow would result in the absence of buoyancy-driven convection for all three cases. We show that even if the Korteweg stress is not a function of temperature, the increase in the diffusion coefficient with temperature can result in convection because a gradient in the transition zone width develops. We also examine the effects of a polymer viscosity that is not only a function of concentration but also temperature. We demonstrate that a constant flux of heat, as would be realistic for a heating element in contact with the side of the reactor, would produce a greater flow than a linear thermal gradient parallel to the transition zone. We demonstrate that qualitatively different flow patterns can be realized by using unusual initial conditions that could be realized with different masks for the photopolymerization. We also demonstrate that the volume change during polymerization and caused by side heating could not cause significant fluid flow that would confound the observation of Korteweg-stress induced flows. To avoid buoyancy-driven convection, the experiment would have to be performed in microgravity.

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Section: Variable Transition Zone Widthmentioning

confidence: 99%

Numerical Simulations of Convection Induced by Korteweg Stresses in a Miscible Polymer–Monomer System: Effects of Variable Transport Coefficients, Polymerization Rate and Volume Changes

Chekanov

Wyatt

Bessonov

et al. 2008

Microgravity Sci. Technol

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“…Such a rotational dependence is also seen with immiscible systems. They observed that interfacial width did not grow with the expected √ t dependence although the DDA-pDDA system was previously shown to follow Fick's law in a static configuration [3]. We proposed that diffusion weakens the EIT, which allows the drop to stretch.…”

Section: Dodecyl Acrylate In Poly(dodecyl Acrylate)mentioning

confidence: 88%

Instabilities of Diffuse Interfaces

Bessonov

Viner

Volpert

et al. 2008

Math. Model. Nat. Phenom.

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Abstract. Composition gradients in miscible liquids can create volume forces resulting in various interfacial phenomena. Experimental observations of these phenomena are related to some difficulties because they are transient, sufficiently weak and can be hidden by gravity driven flows. As a consequence, the question about their existence and about adequate mathematical models is not yet completely elucidated. In this work we present some experimental evidences of interfacial phenomena in miscible liquids and numerical simulations of miscible drops and diffuse interfaces.

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“…For example, they are used in polymer chemistry to study changes in free volume of polymers as a function of polymerization reaction parameters, molecular weight, and crosslinking, [27][28][29][30] in cell physiology to study cell membrane viscosity which is linked to Radial pumping is accomplished with syringe pump. The distance b between the two plates of the Hele-Shaw cell is set to 0.65 mm.…”

Section: A Molecular Probementioning

confidence: 99%

Reconstruction by fluorescence imaging of the spatio-temporal evolution of the viscosity field in Hele-Shaw flows

et al. 2014

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We study the spatio-temporal evolution of the viscosity field during stable and unstable radial flows of glycerol-water solutions in a horizontal Hele-Shaw cell where a localized temperature gradient is imposed. The viscosity field is reconstructed from the measurement of the fluorescence emitted by a viscosity-sensitive molecular probe (Auramine O). For an immiscible flow, the viscosity and temperature fields are obtained accurately. For miscible displacements, we show how the interplay between the viscosity changes of both fluids and the variation of the fluid thickness in the gap prevents obtaining strict quantitative reconstruction of the viscosity field. We explain how the reconstructed viscosity field can nevertheless be interpreted to obtain information about the fluid thickness and the local viscosity and temperature.

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Measuring the Mutual Diffusion Coefficient for Dodecyl Acrylate in Low Molecular Weight Poly(dodecyl acrylate) with Laser Line Deflection (Wiener's Method) and the Fluorescence of Pyrene

Cited by 17 publications

References 22 publications

Numerical Simulations of Convection Induced by Korteweg Stresses in a Miscible Polymer–Monomer System: Effects of Variable Transport Coefficients, Polymerization Rate and Volume Changes

Numerical Simulations of Convection Induced by Korteweg Stresses in a Miscible Polymer–Monomer System: Effects of Variable Transport Coefficients, Polymerization Rate and Volume Changes

Instabilities of Diffuse Interfaces

Reconstruction by fluorescence imaging of the spatio-temporal evolution of the viscosity field in Hele-Shaw flows

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