Using MicroMounts™ and MicroLoops™ for Small Molecule and Inorganic Crystallography
Mitegen's products are much easier to use and give less background scatter than glass fibers and other mounting tools common in small molecule crystallography.
Cut the stainless steel rod (if necessary) to a desired length using our cutters or other cutters designed for spring-temper steel.
Insert the stainless steel rod of the MicroMount into a goniometer base (our B4 base is most popular for small molecule applications) using a small amount of, e.g., epoxy, glue or Dow-Corning #976V high vacuum grease to hold it in place. Alternatively, use one of Mitegen's glue-free reusable goniometer bases. For easier handling, attach the base to a magnetic wand. The rod can also be inserted into a 0.7 mm mechanical pencil.
Scoop or place the crystal into the sample aperture. The crystal can be held in place using a tiny amount of, e.g., contact adhesive, applied using a small (25 gauge or smaller) tungsten or molybdenum wire. Alternatively, a small drop of ethyl cellulose dissolved in ethyl acetate can be placed on the crystal/mount and allowed to evaporate, providing a thin polymer film that holds the crystal in place.
To make the ethyl cellulose/ethyl acetate mixture:
Mix 300 micrograms ethyl cellulose in 75 ml of ethyl acetate.
Slowly heat the mixture (with boiling chips) to the boiling point in a fume hood, and boil gently for 5 minutes. Let cool to room temperature. Be sure to read warnings about each component. Ethyl acetate can be dangerous at temperatures above 77 C.
Both components are available from many US suppliers.
J.T. Baker (1-800-582-2537)
ethyl cellulose: (Be sure to specify powder or granule form.)
Island Group 516-746-2100
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