Desirable properties in energetic materials include high density, thermal stability, low hygroscopicity, and low sensitivity; these properties and others are correlated to the crystalline order of the material in the solid state. Cocrystallization, the combination of two or more compounds in the solid state with a defined order and stoichiometry, affords the opportunity to rationally design novel energetics with improved properties and without the challenges and uncertainty of traditional synthesis pathways. Work in this area is fundamental to understanding how interactions in the solid-state manifest in physical properties and will inform the design of myriad future materials ranging from safer air-bag gas generators to more efficient and environmentally benign rocket boosters.
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