TEM (a, b, and c) images of prepared mesoporous silica nanoparticles with mean outer diameter: (a) 20nm, (b) 45nm, and (c) 80nm. SEM (d) image corresponding to (b). The insets are a high magnification of mesoporous silica particle.
The Definition of a Monochrome Laser Printer. Monochrome laser printers are machines that print text and images from computers by using a laser beam to control where a single color is applied to paper. They're often faster than other types of printers and can generally produce large numbers of black-and-white documents cheaper than other printers.
Direct thermal printers. Direct thermal printers require the use of heat activated thermal papers and films, but require no transfer ribbon. The print color is limited to black, unless special, preprinted direct thermal paper is utilized, and the printing is not as crisp as that of thermal transfer ribbon printing. Over time the labels will darken, particularly when the surface gets scratched, or is subjected to heat and sunlight.