A new modeling of asymmetric membrane formation in rapid mass transfer system

Kim, Young Duk; Kim, Je Young; Lee, Hwan Kwang; Kim, Sung Chul

doi:10.1016/s0376-7388(01)00420-3

Cited by 43 publications

(21 citation statements)

References 18 publications

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“…Theoretically, diffusion in a ternary system is described by four diffusion coefficients, main diffusion coefficients, D 11 and D 22 and cross diffusion coefficients, D 12 and D 21 . In all predictions reported so far, the friction-based diffusion model proposed by Alsoy and Duda [29] were utilized.…”

Section: Effect Of Diffusion Formalismmentioning

confidence: 99%

“…Concentration paths in Fig. 14 were predicted through the insertion of Alsoy and Duda's diffusion model [29] using only the main diffusion coefficients, i.e., the cross diffusion coefficients D 12 and D 21 were set equal to zero. The results in Fig.…”

Section: Effect Of Diffusion Formalismmentioning

confidence: 99%

“…Thus, there has been considerable motivation for developing mathematical models for phase inversion techniques to eliminate extensive trial and error experimentation and optimize membrane preparation conditions. Most of these mathematical models and corresponding experimental work is focused on wet cast [1][2][3][4][5][6][7][8][9][10][11][12][13] and thermal cast processes [10,[14][15][16]. However, there are relatively few quantitative studies on the dry-cast process even though this technique offers some advantages compared to other phase inversion techniques.…”

Section: Introductionmentioning

confidence: 99%

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Membrane formation by dry-cast process

Altınkaya

Yenal

Ozbas

2005

Journal of Membrane Science

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Asymmetric membranes were prepared by dry-cast phase inversion technique from a cellulose acetate, acetone, water solution in order to assess the validity of the mathematical model recently developed by us. Based on the model predictions, general structural characteristics of the membranes were determined by plotting the composition paths on the ternary phase diagram and polymer concentration profile at the first moment of precipitation. Composition paths on the ternary phase diagram enable the assessment of whether a phase separation occurs and allow prediction of inception time and duration of the phase separation. The polymer distribution at the moment of precipitation provides a rough thickness of the high polymer concentration region near the interface and a pore distribution of the sublayer structure. The effects of polymer/nonsolvent ratio in the casting solution, the initial film thickness, evaporation temperature, relative humidity and velocity of air were investigated. Model predictions were compared with the morphological analysis conducted using scanning electron microscopy. Results show that diffusion formulation plays an important role in capturing the accurate structure of the membrane from the model predictions.

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Section: Effect Of Diffusion Formalismmentioning

confidence: 99%

Section: Effect Of Diffusion Formalismmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Membrane formation by dry-cast process

Altınkaya

Yenal

Ozbas

2005

Journal of Membrane Science

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“…The phase separation rate during the formation of porous membrane can be studied by light scattering method [15]. Many mass transfer models have been developed to calculate the composition change during membrane formation [16][17][18][19]. Fig.…”

Section: Introductionmentioning

confidence: 99%

Formation and evolution of a bicontinuous structure of PMMA membrane during wet immersion process

Kuo

Tsai

et al. 2008

Journal of Membrane Science

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“…The ultimate membrane structure can be predicted to some extent by the calculated composition change path. Although most of the models were useful only before the phase separation, Kim et al recently extended the calculation to include post‐phase separation 10. Several studies have been presented in measuring phase separation rate mainly in the initial early stage of the phase separation by the light scattering method 11–14.…”

Section: Introductionmentioning

confidence: 99%

Studies on phase separation rate in porous polyimide membrane formation by immersion precipitation

Matsuyama

Nakagawa

Maki

et al. 2003

J of Applied Polymer Sci

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Phase separation rate during porous membrane formation by immersion precipitation was investigated by light scattering in a polyimide/N-Methylpyrrolidone (NMP)/water system. In the light scattering measurement, plots of scattered intensity against scattered angle showed maxima in all cases, which indicated that phase separation occurred by a spinodal decomposition (SD). Characteristic properties of the early stage of SD, such as an apparent diffusion coefficient D app and an interphase periodic distance ⌳, were obtained. The growth process of ⌳ was also followed by light scattering. The growth rate had the same tendency as D app when water content in the nonsolvent bath and the polymer concentration in the cast solution were changed. The pore size of the final membrane increased with decreasing water content, which was opposite to the tendency of ⌳ growth rate.

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A new modeling of asymmetric membrane formation in rapid mass transfer system

Cited by 43 publications

References 18 publications

Membrane formation by dry-cast process

Membrane formation by dry-cast process

Formation and evolution of a bicontinuous structure of PMMA membrane during wet immersion process

Studies on phase separation rate in porous polyimide membrane formation by immersion precipitation

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