DSpace collection: 專書之單篇

Permselective membranes for wastewater treatment

title: Permselective membranes for wastewater treatment abstract: Since the development of a stable ion-exchange membrane with low electric resistance in 1950, ion-exchange membranes have advanced from laboratory scale operations to industrial productions with extensive applications. Although ion separation is the most common function of ion-exchange membranes, most membranes exhibit non-selective removal of specific ions. In membrane technologies, permselectivity is defined as the preferential transport of specific ionic species through membranes that bear fixed charges in the polymer matrix based on Donnan effect and Donnan exclusion. Permselectivity of membranes can be discussed in two categories: the selectivity between co-ions and counterions and that between different counterions. An ideal permselectivity membrane should exhibit a high retention capacity for co-ions, a high transport number and selectivity for counterions, and in some cases, selectivity between monovalent and divalent counterions or among ions with same charge, e.g., NO3− and Cl−. In general, the ion separation ability depends on the ionic size, affinity of the counterions toward the membrane, and the difference in ion mobility within the membrane. Therefore, significant research has focused on the modification of pore size, surface functional groups, and microstructures of the membrane via various synthesis procedures in order to precisely tune membrane permselectivity. Previous efforts on selective membranes for anion and cation removal from wastewater, respectively, were reviewed. System integration involving permselective membranes and electrochemical processes for wastewater treatment is presented. Finally, examples of industrial applications of permselective membranes for the treatment of wastewaters were discussed. Overall, this chapter provides comprehensive information on the advances and applications of permselective membranes for the remediation of specific impaired waters.

CAE for Advanced Injection Molding Technologies

title: CAE for Advanced Injection Molding Technologies abstract: Injection molding is one of the most popular polymer processing methods and has been used to mass produce plastics products for many decades. However, due to increasingly stringent requirements and higher customer expectations, conventional injection molding cannot always meet all manufacturing specifications. Hence, many advanced injection molding technologies have been developed to accommodate the higher standards and special features. Those technologies include the following: • Multi-component molding techniques such as over-molding, insert molding, co-injection molding, and bi-injection molding. • Lightweight technologies such as injection molding using fiber-reinforced plastic (FRP), microcellular injection molding, gas-assisted injection molding, and water-assisted injection molding. • Advanced heating and cooling management techniques including advanced hot runner systems, conformal cooling, and variotherm technologies. • Special molding technologies such as injection–compression molding, compression molding, and so on.

Zone Refining

title: Zone Refining

“Advanced CAE technology for Microcellular Injection Molding”

title: “Advanced CAE technology for Microcellular Injection Molding” abstract: Microcellular technology has been enormously developing and applied in many foaming processes for many industrial polymers manufacturing, since the microcellular batch processing technology has brought out by Dr. Nam Suh and co-workers at MIT in the early 1980s [1]. The microcellular application used in reciprocating screw injection molding machine was built by Trexel and Engel in 1998 [2]. Despite the microcellular technology has been developing for many decades and widely used in today’s plastic product manufacturing, the reliable computer aided engineering application is not well developed due to limited understanding of complex foaming mechanism. Venerus [3] reviewed numerous diffusion-controlled modeling studies of polymer foaming and showed the diffusion-induced bubble growth in viscoelastic liquids numerically having good agreement with experimental data. Taki [4] studied the effects of pressure release rate on bubble density and sizes. Recently, the previous developed models of cell foaming have been couple with 3D flow motion technology for microcellular injection molding. However, the dynamic features of bubble growth and the integration from bubble growth mechanism to the final injected parts are not fully developed. In this chapter, we are going to describe about the numerical development in microcellular injection molding. Furthermore, the dynamic features of bubble growth, including bubble size and bubble density are validated with the experimental data done by Turng and co-workers [5]. Moreover, this advanced CAE technology is applied in some case to realize how and why microcellular process can benefit in details.

台灣化工史-發光二極體

title: 台灣化工史-發光二極體

Hydrodynamic Behavior of Flow in a Drinking Water Treatment Clarifier

title: Hydrodynamic Behavior of Flow in a Drinking Water Treatment Clarifier

Separation Theory in Thermal Diffusion Columns

title: Separation Theory in Thermal Diffusion Columns

化學品儲運安全

title: 化學品儲運安全

鋅在含矽酸鈉的鹼性電解液中陽極溶解的動力模式

title: 鋅在含矽酸鈉的鹼性電解液中陽極溶解的動力模式