Cooling coating

The study was also extended to CoO nanoparticles [73] employing a sacrificial starch template. This method provided uniform shape and size, and was easy to perform at bulk levels. The size distribution of the nanoparticles was in the range of 15-30 nm, with a crystallite size of 18 nm. The low size and aggregation free character of the nanopaiticles resulted in a NIR reflectance of above 75%, in spite of a black color (where NIR reflectance values are expected to be less than 30%). This provided feasibility for employing CoO nanoparticles as components of cool coatings on leather, automobile surfaces, and so oa... 

Chen Y, Begnaud F, Chaintreau A, Pawliszyn J (2007) Analysis of flavor and perfume using an internally cooled coated fiber device. J Sep Sci 30 1037-1043... 

General Electric did a series of trade studies that indicated that the best economics resulted in maximizing the reactor size because this maximized the reactor size possible with passive safety. Assuming that the AHTR power density will be similar to proposed gas-cooled coated-particle fuel reactors, the maximum power level is -2400 MW(t). Using similar power densities as a gas-cooled reactor has several implications. 

If the cooled coating is not tacky, the coated substrates can be piled and stored for future use, when they will have to be heated to reactivate the adhesive. Alternatively, the bond is often made immediately after application of the hot-melt, powder, or extruded coating. This procedure offers best production rates, since the cooling of a hot-melt is faster than evaporation of solvent or chemical setting. 

If it is desired to employ fluoboric acid HBF4, it can be prepared by adding 100 g. of A.R. boric acid in small proportions to 325 g. of A.R. hydrofluoric acid (40 p>er cent. HF) cooled in ice the hydrofluoric acid is contained in a Bakelite beaker, a beaker coated with wax or in a lead vessel. A simple container may also be prepared by cutting of the neck of the wax bottle (in which the hydrofluoric acid is supplied) with a large e.g., a butcher s ) knife which has been slightly warmed. One-third of the above solution should be employed in the preparation. Handle unth great care. 

The next day comes and the hung-over chemist wakens to see a dark red solution stirring away. In some cases where the chemist had made an enormous batch of this stuff, there may be seen a small mass of crystalline precipitate at the bottom of the flask. This is no big deal and will go away in the next step. If the chemist had made this in a flat-bottomed flask (which she really should have for convenience) then the ice tray is removed, the flask returned to the stir plate, a distillation setup attached, and the acetone is vacuum distilled from the flask. After all the acetone has come over the chemist can proceed in two different ways. One way is to just keep on distilling the solution until all of the formic acid has been removed. The chemist knows that just about all the formic has been removed when there is about 300mL of thick black liquid remaining in the reaction flask and hardly any clear formic acid is dripping over into the collection flask. If one were to swirl the reaction flask, the liquid will appear syrupy and kind of coat the sides of the flask. This is more evident when the flask cools. A quick sniff of the flask may indicate that some formic is still in there, but it should be too minimal to be of any concern. 

Other Techniques. The FEP resin is bonded to metal surfaces by the appHcation of heat and pressure it can be heat sealed or hot-gas welded. Heating FEP at 260°C and allowing it to cool slowly results in stress relieving, or annealing. The FEP film is used to weld PTFE-coated surfaces. 

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