Diffusion of disperse dye in porous membrane.

Sasaki, Hiroaki; Daikuhara, Takebi; Kido, Hanpei; Choji, Noriko; Karasawa, Mikio

doi:10.2115/fiber.43.4_218

Cited by 3 publications

(3 citation statements)

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“…As far as non-ionic dyes on hydrophobic fibers are concerned, L is fixed by Eq. (2)11) (2) where D, is a diffusion coefficient of the dye in water, K is a partition coefficient, and SD is a thickness of the diffusional boundary layer.…”

Section: Time Dependence Of Surface Concentrationmentioning

confidence: 99%

Diffusion of a disperse dye in the multiple layers of nylon fabric.

et al. 1989

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The concentration distribution of a disperse dye in the multiple layers of nylon fabric is investigated. The surface concentration increases with dyeing time. The increase is attributable to the resistance to dye transport across the diffusional boundary layer. The boundary layer parameter (L.) and the diffusion coefficient (Df) of dye in nylon fabric are estimated in such a way that the experimental data fit in with the theoretical curve of concentration distribution based on the diffusional boundary layer model. The estimated values of thickness of diffusional boundary layer (3d) range from 0.017 to 0.011cm when the dye bath is stirred at 100-150 rpm. As the multiple layer of nylon fabric has spaces or pores between the yarns and also between the individual filaments, it is considered that the dye molecules diffuse through the liquid in the spaces or pores of nylon fabric. Consequently, the observed diffusion coefficient was reasonably explained by assuming the "pore model": the calculated value agreed well with the experimental one.

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Section: Time Dependence Of Surface Concentrationmentioning

confidence: 99%

Diffusion of a disperse dye in the multiple layers of nylon fabric.

et al. 1989

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“…After the membranes were dyed, we measured the amount of dye adsorbed in the same way as in the diffusion experiment... In a previous paper [ 14 ] , we showed that the surface concentration of dye in a porous membrane assembly increased with dyeing time. Figure 4 shows the time dependence of the concentration distribution and the surface concentration: the distribution curve goes up with dyeing time.…”

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confidence: 99%

“…We measured the diffusion coefficient of water with the capillary method [13]. The boundary parameter and the estimated dye diffusion coefficient in the porous membrane assembly are summarized in Table Il. In the previous paper [ 14], we estimated the apparent diffusion coefficient in a porous membrane assembly without considering the diffusional boundary layer, which we have calculated here from Equation 3. We obtained an average value of 3.39 X 10-8 cm2/s: where Co is the surface concentration at time t = 0, 'Y is a constant, and 10 is the thickness of the slab.…”

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Diffusion of a Disperse Dye in a Multiple Porous Membrane Assembly

Sasaki¹,

Kidoh²,

Karasawa

1991

Textile Research Journal

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The concentration distribution of a disperse dye in multiple porous membranes has been investigated. The increased surface concentration with dyeing time is attributable to the resistance to dye transport across the diffusional boundary layer. The apparent diffusion coefficient and the thickness of diffusional boundary layer are estimated in such a way that the experimental data fit with the theoretical curve of concentration distribution based on the diffusional boundary layer model. The pore model is applied to explain diffusion behavior in the porous membrane assembly.In order to study the dyeing behavior of a textile

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Effect of Yarn Density on Diffusion of p-Aminoazobenzene in Multiple Layers of Nylon Fabric

Sasaki¹,

Araki²

1993

Textile Research Journal

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Diffusion of p-aminoazobenzene into multiple layers of nylon fabric has been in vestigated using four kinds of plain weave nylon fabrics whose yam density ischanged by varying the pick spacing. The apparent diffusion coefficient and the diffusional boundary layer parameter are estimated in such a way that the experimental data fit with the theoretical curves of concentration distribution based on the diffusional boundary layer model. Since the apparent diffusion coefficient increases with the de creasing pick density of the fabric, the diffusion behavior is explained based on a combined transport mechanism of pore and intrafilament diffusion. The plots of the apparent diffusion coefficient versus the product of the porosity and the specific pore volume show a linear relationship in the limited porosity range of about 0.68 to 0.73 at various temperatures.

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Diffusion of disperse dye in porous membrane.

Cited by 3 publications

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Diffusion of a disperse dye in the multiple layers of nylon fabric.

Diffusion of a disperse dye in the multiple layers of nylon fabric.

Diffusion of a Disperse Dye in a Multiple Porous Membrane Assembly

Effect of Yarn Density on Diffusion of p-Aminoazobenzene in Multiple Layers of Nylon Fabric

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