Jun 12
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Oct 25
Writen by Elizabeth Morgan
Toner is used in a printer as ink. It is a powder-like substance that is most commonly used in laser printers (as well as photocopy machines). The casing in which the toner is kept is known as a toner cartridge.
Toner used to be made in a simple manner. Carbon and soot accumulated from factories and manufacturing plants were refined and used to fill toner cartridges. This was an efficient method of making toner, but the resulting prints were not as sharp and of a high quality. In an endeavor to improve the quality of the prints, the raw carbon was simply mixed with polymer. The use of polymer in toner was of great help as it was melted by the heat of the fuser and caused it to bind with the fibers of the paper. This produced fine and clear copies of detailed images.
A printer toner cartridge is not an expensive buy. It is reusable printer equipment, and many computer and printing companies across the U.S. offer services to refill them. The cost involved is not too high, and if the refilling process is done through a reputed computer store, such as Hewlett-Packard and Epson, guarantees on the refills are provided.
Printer toner cartridges and the toner itself have seen many technological changes. Earlier, machine toner was transferred from a bottle into a container in the machine. However, modern methods make use of disposable cartridges. Toner cartridges are designed mainly to produce professional quality black text and image printing. The results are superior to other printing solutions.
Toner is a fine black powder that is known to escape from the print cartridge while printing or while refilling. It may have some harmful effects on the user if not handled with caution. Toner may irritate people with respiratory conditions, such as asthma or bronchitis.
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Sep 06
http://www.freepatentsonline.com/7419650.html
For applications in hydrogen storage and as molecular sieves short length (<1 micron) carbon nanotubes have been found to have advantages over longer tube lengths for the diffusion of gases. This patent discloses a method for producing such short length CNTs. Claim 1 reads:
1. A method for producing functionalised short carbon nanotubes with at least one open tip comprising mechanically treating long carbon nanotubes in a powder form, wherein a reactant gas able to chemically react with said long nanotubes is chosen and said long carbon nanotubes in a powder form are submitted to mechanical milling forces in the presence of said reactant gas so that short carbon nanotubes, comprising at least one specific chemical group, are obtained, and wherein said reactant gas is not air.