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In clay polymer nanocomposite technology, nowadays there is concern about the safety and environmental effects of the nanometric materials. In this work, sheets of layered titanosilicate JDF-L1 were synthesized with a size of 5.3 μm and thickness of 115 nm and used to fabricate composite polyamide 6 (PA6) films. The JDF-L1 synthesis was scaled in one pot and the rosette-like particles obtained were disaggregated using a simple process with NaOH solution. The composite with 2 wt.% of disaggregated JDF-L1, characterized by X-ray diffraction and electron microscopy, showed parallel orientation (with respect to the film itself) and good dispersion of the sheets. The composite had a similar barrier effect as the PA6 and its mechanical properties did not deteriorate. This opens up the use of this composite as a packing material providing other properties, such as a biocidal effect and synergy effect in combination with other additives. [ABSTRACT FROM AUTHOR]

MFI-type zeolite membranes prepared on stainless steel and alumina tubular supports were used to separate a CO/air mixture at very low CO concentrations (160 ppbv). The influence of the temperature, pressure gradient across the membrane, sweep gas and retentate gas flow rates in the performance of the membranes was studied. At 245 K, a CO/air separation factor of 3.14 was achieved. [Copyright &y& Elsevier]