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A model for wet-casting polymeric membranes incorporating nonequilibrium interfacial dynamics, vitrification and convection.

หน่วยงาน Nanyang Technological University, Singapore

รายละเอียด

ชื่อเรื่อง : A model for wet-casting polymeric membranes incorporating nonequilibrium interfacial dynamics, vitrification and convection.
นักวิจัย : Lee, Hanyong. , Krantz, William B. , Hwang, Sun-Tak.
คำค้น : DRNTU::Engineering::Civil engineering::Water resources.
หน่วยงาน : Nanyang Technological University, Singapore
ผู้ร่วมงาน : -
ปีพิมพ์ : 2553
อ้างอิง : Lee, H., Krantz, W. B., & Hwang, S. T. (2010). A model for wet-casting polymeric membranes incorporating nonequilibrium interfacial dynamics, vitrification and convection. Journal of Membrane Science, 354(1-2), 74-85. , 0376-7388 , http://hdl.handle.net/10220/11013 , http://dx.doi.org/10.1016/j.memsci.2010.02.066
ที่มา : -
ความเชี่ยวชาญ : -
ความสัมพันธ์ : Journal of membrane science
ขอบเขตของเนื้อหา : -
บทคัดย่อ/คำอธิบาย :

A new model is developed for wet-casting polymeric membranes that address how the concentrations at the interface between the casting solution and nonsolvent bath adjust from initial nonequilibrium to equilibrium values on the binodal. Properly describing the evolution of the interface concentrations enables this new model to predict vitrification, which has been observed experimentally but not predicted heretofore. This new model also incorporates densification-induced convection that arises owing to density changes associated with the concentration gradients and contributes to the mass-transfer fluxes. The predictions for the cellulose acetate, acetone, and water system indicate that densificationinduced convection can increase the mass-transfer flux by nearly two orders-of-magnitude shortly after initiating wet-casting. This increased mass-transfer flux can have a marked effect on the properties of the functional layer of asymmetric membranes that is formed early in the casting process. The predictions for initial casting-solution thicknesses of 75 and 125 m are markedly different. When densification induced convection is included, the 125 m film is predicted to enter well into the metastable region, thereby allowing supersaturation that promotes macrovoid defects. Hence, this new model provides an explanation for the effect of casting-solution thickness on the occurrence of macrovoids.

บรรณานุกรม :
Lee, Hanyong. , Krantz, William B. , Hwang, Sun-Tak. . (2553). A model for wet-casting polymeric membranes incorporating nonequilibrium interfacial dynamics, vitrification and convection..
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Lee, Hanyong. , Krantz, William B. , Hwang, Sun-Tak. . 2553. "A model for wet-casting polymeric membranes incorporating nonequilibrium interfacial dynamics, vitrification and convection.".
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Lee, Hanyong. , Krantz, William B. , Hwang, Sun-Tak. . "A model for wet-casting polymeric membranes incorporating nonequilibrium interfacial dynamics, vitrification and convection.."
    กรุงเทพมหานคร : Nanyang Technological University, Singapore, 2553. Print.
Lee, Hanyong. , Krantz, William B. , Hwang, Sun-Tak. . A model for wet-casting polymeric membranes incorporating nonequilibrium interfacial dynamics, vitrification and convection.. กรุงเทพมหานคร : Nanyang Technological University, Singapore; 2553.