A new concept in preparation techniques of powders
1971; Elsevier BV; Volume: 5; Issue: 1 Linguagem: Inglês
10.1016/0032-5910(71)80065-7
ISSN1873-328X
AutoresJames D. Wilcox, Joel M. Klein,
Tópico(s)Aerogels and thermal insulation
ResumoThe problem was to prepare a free-flowing, readily dispersable powder of CN (“tear gas”, an oily, sticky solid that is a respiratory irritant, having a low melting point) in the 1–10 μm size range. Past powder preparation techniques had been unsatisfactory due primarily to agglomeration. A modification of a new technique used a silica aerogel that had been chemically converted to a hydrophobic form (containing a bonded silicone compound) to coat the small particles of CN. This modification did not alter the chemical properties of the irritant material. The coating affords protection for the CN from moisture and gives excellent storage characteristics. The resultant powder was free flowing and readily dispersable from a low energy blower.
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