Polymeric membranes modified

Buonomenna, M.G., Lopez, L.C., DavoU, M., Favia, R, d Agostino, R. and Drioli, E. 2009. Polymeric membranes modified via plasma for nanofiltration of aqueous solution containing organic compounds. MicmporMesoporMMer 2. ... 

Polotskaya et al. (2010) developed polymeric membranes modified by fullerene Cgo for PV. Two polymers, PPO and poly(phenylene isophthalamide), were modified by fullereneCgo. The PV of the reacting mixture of EtOH-acetic acid-water-ethylacetate by fullerene-PPO membranes and that of the methanol-CYH mixture azeotropic point by fullerene-PA membranes were demonstrated on these new membranes. 

Haemodialysers Replacement of deficient kidneys for blood purification Flowing blood anticoagulated with heparin Flexible polymers for tubing porous polymeric membranes modified cellulose, PAN copolymers, polysulfone... 

Li, J., Tachihara, K., Nagai, K., Nakagawa, T, and Wang, S. (1996) Selective permeation of sour gases through polymeric membranes modified by sulfolanes. I. Study of selective permeation of CO2 through modified polymeric membranes determined on different systems./. Appl. Polym. Sci., 60, 1645-1654. 

Polymeric membranes modified through the dynamic single layer of polyelectrolyte adsorption method, as reported by Ba et al. (2010), provided some useful information about the membrane performance stability. In this study, a cross-flow system was... 

Most modern materials are formed empirically by solid-state methods. These methods generally involve more processing activity than chemical synthesis (for example, sintering of ceramic powders, modifying concrete by polymers, thermomechanical processing of alloys, layering polymeric membranes for... 

Independent of the assumptions A to C the cation selectivity of the membranes in the equilibrium domain is therefore controlled by the ratio of the complex formation constants (6) and should therefore be identical for different types of neutral carrier membranes.18 Figure 2 indicates that there is indeed a close parallelism between the selectivities of solvent polymeric membranes (SPM) and bilayer lipid membranes (BLM) modified with valinomycin 1, nonactin 2, trinactin 5, and tetranac-tin 6 (see also Ref. 18). This is in good agreement with findings from Eisenman s45 and Lev s15 research groups. 

Approaches aiming at creating biocompatible environments consist in modifying the surface of polymeric membranes by attaching functional groups like sugars, polypeptides and then to adsorb the enzymes. 

There are two types of membranes, cellulosic and synthetic or polymeric ones. Cellulosic membranes can be in regenerated cellulose (cuprophan, Bioflux from Membrana, Germany) or modified cellulose (cellulose acetate or diacetate, from Asahi, triacetate cellulose from Baxter and Nipro, which has a high hydraulic permeability or Hemophan from Membrana). Cuprophan was originally the most common one, because of its low cost, but is no longer produced because of its lower biocompatibility and hydraulic permeability. A wide variety of polymeric membranes are now available with both high and medium hydraulic permeabilities. Only the Eval... 

Another method to achieve bonding of a polymeric membrane with a glass plate for cell experiments was to first decorate the membrane with avidin and modify the glass plate surface with biotin. The avidin-coated membrane was then tightly bonded with the biotin-coated glass plate [176]. 

In this system, the pathway of drug transport is no longer straight, but tortuous. The porosity e of the membrane and the tortuosity r of the pathway must therefore also be considered. Thus for a porous polymeric membrane, Equation 4.4 is modified as follows ... 

Suitably modified fiber optic sensors can also be used for detecting gas vapors, humidity, ions, and organic compounds. Fiber inclusions that show length variation were used to develop humidity sensors, whereas ion-responsive lipid bilayers formed the basis for the detection of inorganic ions. Immobilized neutral and ionic crown ethers in polymeric membranes were designed as sensors for determination of barium and copper (Wolfbeis 2000). 

Multicomponent films were studied in [2963], and multilayer membranes in [279,2964-2967]. The polymeric membranes studied in [2968] were modified by post-treatment. Also, a-alumina identical to the material in Membralox membrane from SCT, studied in [1851], probably underwent surface treatment. 

In this context, facilitated transport of a specific gas molecule through modified polymeric membranes or liquid membranes containing mobile carriers can be employed to improve single bulk material (polymer) properties. Ceramic material is not traditionally employed as hquid membrane support due to their high cost, use of not aggressive compounds to be separated and mild operating conditions. 

For implantable reservoir devices, a cylindrical geometry is often more practical than a planar arrangement. Consider a cylindrical reservoir surrounded by a polymeric membrane (Figure 9.2c) the cylinder has a length L, cross-sectional radius b, and wall thickness b — a.ln practice, the rate of drug release from this cylinder can be modified by changing the geometry of the device (by... 

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