Nanocomposite membranes

Both the high-temperature and reverse selective polymeric nanocomposite membranes are being investigated on a laboratory scale. 

Gas permeation properties of ethylene vinyl acetate-silica nanocomposite membranes./. Membr. Sd., 322 (2), 423 28. 

Sitter, K.D., Andersson, A., D Haen, J., Leysen, R., Mullens, S., Maurer, F.H.J., and Vankelecom, I.F.). (2008) Silica filled poly(4-methyl-2-pentyne) nanocomposite membranes similarities and differences with poly(1 -trimethylsilyl-1 -propyne)-silica systems./. Membr. Sd., 321 (2), 284-292. 

Fabrication of polymer/selective-flake nanocomposite membranes and their use in gas Separation. Chem. 

Wang, H., Holmberg, B.A., and Yan, Y. (2002) Homogeneous polymer-zeolite nanocomposite membranes by incorporating dispersible template-removed zeolite nanocrystals. /. Mater. Chem.,... 

Q. 2006 -Thln-fllm nanocomposite membrane developed at UCLA... 

Along similar lines, other researchers have been looking into nanocomposite membranes.16 Researchers at the University of Colorado at Boulder have been developing lyotropic liquid crystals (LLCs) to form what they call nanostructured polymer membranes.16 The LLCs can from liquid crystalline phases with regular geometries... 

Zhang et al. reported a nanocomposite membrane of shuttle shaped ceria nanocrystals (Guo et al., 2008), SWNTs, and ILsl-butyl-3-methyli-midazolium hexafluorophosphate (BMIMPFg), which was incorporated on the glassy carbon electrode for electrochemical sensing of the immobilization and hybridization of DNA (Zhang et al., 2009). The electron transfer resistance (Pgt) of the electrode surface increased after the immobilization of probe ssDNA on the Ce02-SWNTs-BMIMPF6 membrane and rose further after the hybridization of the probe ssDNA with its complementary sequence. 

Patel NP, Miller AC, and Spontak RJ. Highly C02-permeable and selective polymer nanocomposite membranes. Adv. Mater. 2003 15 729-733. 

Merkel TC, Freeman BD, Spontak RJ, He Z, Morisato A, Pinnau I, Meakin P, and Hill AJ. Ultrapermeable, reverse-selective nanocomposite membranes. Science 2002 296 519-522. 

M.A.E. Robertson and K.A. Mauritz. Infrared investigation of the silicon oxide phase in [perfluoro-carboxylate/sulfonate (bilayer)]/ [sihcon oxide] nanocomposite membranes. Journal of Polymer Science Part B-Polymer Physics 36, 595-606 1998. 

Fig. 6 Illustration of Nafion-acid functionalized zeolite Beta nanocomposite membranes helping to increase the proton conductivity and decrease the methanol crossover (A) H2O and CH3OH diffusion reduced by zeolite flow resistance (B) sulphonic acid functionalized zeolite nanoparticles increases proton conductivity of composite membranes. (View this art in color at www. dekker. com.)...

The methanol permeability of the nanocomposite membranes was shown to decrease on addition of the sulfonated titanate. Functionalized montmorillonite (MMT) was also employed to improve PFSA [58, 59] these composite membranes provide a low methanol crossover, without sacrifidng proton conductivity due to the introduction of sulfonic acid groups at the MMT surface, followed by blending with the Nafion ionomer. 

Jiang CY et al (2004) Freely suspended nanocomposite membranes as highly sensitive sensors. Nat Mater 3(10) 721-728... 

The present volumes entitled Chitosan for Biomaterials 1 and 11 were conceived to provide broad and thorough knowledge for highly advanced applications of chitosan and its derivatives in the form of micro- and nanoparticles, nanocomposites, membranes, and scaffolds. The books consist of 15 chapters written in a manner that meets the expectations of scientists in various disciplines. 

Conducting Polymer Nanocomposite Membrane as Chemical Sensors... 

The chemical-physical properties of nanocomposite and membrane finds unique place in sensor application due to combinational properties. The basic use of nanocomposite is to the products, which show many folds of improvement on the physical and mechanical properties or on the processing properties upon addition of very minute quantity of nanomaterials [99], Nanoscale particles not only enhance the mechanical properties but also have wide potential in the field of electronic, magnetic, optical, and chemical field. The polymer nanocomposites provide improvement over other known composites in thermal, mechanical, electrical, and even air barrier properties [64-70], Formulation of nanocomposite membranes with suitable polymer, suitable nanoparticles, and the processing technology of the nanocomposite are critical to success factor to dominate the gas sensor product in the market. 

FIGURE 2.13 Ammonia sensing by PANI-Sn02 nanocomposite membranes. 

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