In order to examine the ability of multi-multi-walled carbon nanotube for CO_2 separation from flue gas, uptakes of CO_2 and N_2 were measured at temperatures of 288 K, 298 K and 308 K over the pressure range 1 to 40 bar using volumetric method. The experimental data was fitted by the Langmuir and Frendlich model isotherms. The same shape of isotherms introduced a common mechanism of adsorption but the amount of CO_2 adsorbed on multi-multi-walled carbon nanotube was 2.5 times higher than N_2 adsorption which indicated the possibility of CO_2 removal from flue gases using adsorption process with multi-multi-walled carbon nanotube as the adsorbent. Isosteric heat of adsorption was evaluated from a set of isotherms based on the Clausius-Clapeyron equation.
The food packaging industry demands polymer films possessing a defined barrier against permeation of gases, moisture and flavor. The objective of this study was to assess the differences between the barrier properties of coated and un-coated polyolefine films. Eight types of packaging films are prepared by standard industrial procedure by cast film extrusion processing with chill rollers: biaxially oriented polypropylene (BOPP), BOPP coated by acrylic copolymer, metallized BOPP by aluminum, and low-density polyethylene (LDPE). The influence of lamination and metallization on the gas molecules (CO_{2}, O_{2} and N_{2}) was determined by Lyssy's method. The moisture transparency was assessed according to the gravimetric method. The substantial differences between the barrier properties of the coated and un-coated films were estimated. It was estimated that the lamination process improves the oxygen barrier but not necessarily the moisture barrier, due to the different mechanisms for oxygen and moisture permeability. The obtained barrier properties data were considered from a practical point of view. It was concluded that films based on metallized BOPP has excellent barrier properties and can be used to over wrap food products.
The 100 nm particles of Fe_{2}O_{3} and metallic Fe sedimented jointly with Al_{2}O_{3} powder from their suspension in oleic acid exhibit distinguished mobility which depends on the concentration of aluminum oxide. This observation is interpreted as the result of the interparticle Fe-Fe magnetic interactions which lead to the formation of the rigid network of magnetic metallic iron nanoparticles.
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