Water → HCID 88776009, compound

Participants

Reaction Steps

The powder was formed by spray-drying a liquid emulsion. The liquid emulsion was prepared from a premix of 75 grams of water, 50 grams of dextran (average MW˜37,500), 45-grams of ethyl alcohol, and a 30-gram measure of molten monoolein. The mixture had a final ratio of 37.5% water, 25% dextran, 22.5% ethyl alcohol and 15% monoolein. Observation indicated that this mixture was an emulsion of isotropic liquid in a lamellar and/or nematic liquid crystalline continuous phase. The mixture was then pumped at a rate of 3.92 grams per minute through the liquid side of a twin-fluid atomizer, with slight adjustments being made to the flow rate to keep the temperature of the exit air in the system between 125–135° C. The liquid feed was atomized with air at a pressure of 42.6 psi (293.5 kPa). The powders produced were comprised of 5–100 μm agglomerates of 1–10 μm primary particles that are likely dextran shells coating monoolein and residual ethanol (˜10 w/w). Hydration of the powders produced mostly sub-micron cubic liquid crystalline particles in the range of at least about 0.1 m to at least about 10 m.

Provenance & Evidence