Loading...
  • chemistry
  • citation needed] The synthetic route for producing silica gel was patented by chemistry professor Walter A. Patrick at Johns Hopkins University in 1918. (wikipedia.org)
  • John Henderson Knox FRSE (born 1927) is Emeritus Professor of Physical Chemistry at the University of Edinburgh and is considered a distinguished contributor to the fields of reaction kinetics and chromatography. (wikipedia.org)
  • phases
  • The stationary phases are usually finely ground powders or gels and/or are microporous for an increased surface, though in EBA a fluidized bed is used. (wikipedia.org)
  • For example, with silica gel, a very polar substance, non-polar mobile phases such as heptane are used. (wikipedia.org)
  • carbon
  • He also invented pourous graphitic carbon (now Hypercarb), creating an alternative packing material to silica gels for the industry. (wikipedia.org)
  • moisture
  • In World War II, silica gel was indispensable in the war effort for keeping penicillin dry, protecting military equipment from moisture damage[citation needed], as a fluid cracking catalyst for the production of high octane gasoline, and as a catalyst support for the manufacture of butadiene from ethanol, feedstock for the synthetic rubber program. (wikipedia.org)
  • When a visible indication of the moisture content of the silica gel is required, ammonium tetrachlorocobaltate(II) (NH4)2CoCl4 or cobalt chloride CoCl2 is added. (wikipedia.org)
  • process
  • Plates can be labeled before or after the chromatography process using a pencil or other implement that will not interfere or react with the process. (wikipedia.org)
  • common
  • it is more solid than common household gels like gelatin or agar. (wikipedia.org)
  • It is common for a small compressed air system (similar to a small home aquarium pump) to be employed to circulate the air inside the waveguide over a jar of silica gel. (wikipedia.org)
  • High
  • Silica gel may also be used to keep the relative humidity (RH) inside a high frequency radio or satellite transmission system waveguide as low as possible (see also Humidity buffering). (wikipedia.org)
  • layer
  • To run a thin layer chromatography plate, the following procedure is carried out: Using a capillary, a small spot of solution containing the sample is applied to a plate, about 1.5 centimeters from the bottom edge. (wikipedia.org)
  • small
  • Microscale column chromatography The constriction toward the tip of the Pasteur pipettes may be plugged with a bit of tissue paper or cotton wool to filter off solids from small amounts of liquids. (wikipedia.org)