Self-Assembly Assisted Production of Nontoxic Obscurants

"The present obscurants used in the smoke are in the range of submicron to micron-size. Recent theoretical calculation suggests that the ideal obscurants will be conducting nanorods having diameter of 20 nm and length of 4 micron. Nano InterfaceTechnology, Inc. (NITI) proposes to develop monodispersed metal-coated silica nanorods of above size using self-assembly technique. The core of silica nanorods will be developed by the self-assembly of lipids/phospholipids/surfactants. Theselipids/phospholipids are obtained from biological system. The nanorods will be made conducting by the electroless coating of the metal. Using self-assembly technique, NITI has successfully synthesized core silica nanorods having diameter of 32nm andlength in micron size and the preparation method can be reliably used for synthesizing larger quantities. The thin coating of metal will oxidize easily and the inner core of silica will be nontoxic. In the Phase I feasibility study, the company willsynthesize various sizes of metal-coated nanorods (diameter = 20-40nm and length = 2-4 micron) and its physico-chemical properties will be characterized. The multi-spectral range of the smoke can be broadened by mixing nanorods having different aspectratios and/or different types of metal coatings. We at NITI have worked out that the proposed obscurants will be highly economical because of its production via the self-assembly route. Father, owing to the use of t