Experimental determination of the temperature in a small neighborhood of the gas infrared sources

The results of the experiments carried out are the logical justification for the development of the heat transfer models in the air-filled enclosed areas which are determined by the walls of finite thickness and under conditions of the gas infrared sources operation. It was found that the air convection processes play an important role in formation of the thermal regimes of the areas heated by the radioactive flux coming from the upper boundary of such areas despite the low thermal conductivity of the gas

Experimental determination of the temperature in a small neighborhood of the gas infrared sources

The results of the experiments carried out are the logical justification for the development of the heat transfer models in the air-filled enclosed areas which are determined by the walls of finite thickness and under conditions of the gas infrared sources operation. It was found that the air convection processes play an important role in formation of the thermal regimes of the areas heated by the radioactive flux coming from the upper boundary of such areas despite the low thermal conductivity of the gas

Characterization of bimetallic PdAg nanoparticle arrays by the diblock copolymer micelle approach

International audienc

Experimental determination of the temperature in a small neighborhood of the gas infrared sources

The results of the experiments carried out are the logical justification for the development of the heat transfer models in the air-filled enclosed areas which are determined by the walls of finite thickness and under conditions of the gas infrared sources operation. It was found that the air convection processes play an important role in formation of the thermal regimes of the areas heated by the radioactive flux coming from the upper boundary of such areas despite the low thermal conductivity of the gas

Arrays of bimetallic nanoparticles obtained by the block copolymer inverse micelle method

MICROSCOPIE+MEME+EEH:TEP:MAO:LBU:FCAInternational audienceWe used self-assembled block copolymer templates to generate arrays of bimetallic nanoparticles. In this approach, a block copolymer consisting of hydrophilic and hydrophobic blocks is dissolved in a selective solvent such as toluene in order to obtain inverse micelles. The core of such inverse micelles can then be functionalized with metal precursors ligated by complexation or protonisation to the inner polymer block. The reverse micelles can then be transferred from the solution to the substrate by using, for instance, standard spin or dip coating techniques. The obtained layer exhibits a rather high degree of hexagonal order, reflecting the packing of spherical micelles.We present results on the formation of arrays of both PdAg and PdAu nanoparticles obtained by this method. For the latter a specific study on the stability of the array at high temperatures under oxygen pressure was performed within an objective-lens aberration-corrected environmental transmission electron microscope (Titan ETEM G2 80-300 kV from ThermoFisher Scientific)

Arrays of bimetallic nanoparticles obtained by the block copolymer inverse micelle method

MICROSCOPIE+MEME+EEH:TEP:MAO:LBU:FCAInternational audienceWe used self-assembled block copolymer templates to generate arrays of bimetallic nanoparticles. In this approach, a block copolymer consisting of hydrophilic and hydrophobic blocks is dissolved in a selective solvent such as toluene in order to obtain inverse micelles. The core of such inverse micelles can then be functionalized with metal precursors ligated by complexation or protonisation to the inner polymer block. The reverse micelles can then be transferred from the solution to the substrate by using, for instance, standard spin or dip coating techniques. The obtained layer exhibits a rather high degree of hexagonal order, reflecting the packing of spherical micelles.We present results on the formation of arrays of both PdAg and PdAu nanoparticles obtained by this method. For the latter a specific study on the stability of the array at high temperatures under oxygen pressure was performed within an objective-lens aberration-corrected environmental transmission electron microscope (Titan ETEM G2 80-300 kV from ThermoFisher Scientific)