Supercritical fluid molecular spray film deposition and powder f

Details Supercritical fluid molecular spray film deposition and powder f Supercritical fluid molecular spray film deposition and powder f

1983-09-01

1986-04-15

Lusignan, Michael R.

Coating processes

Spraying

118300, 118308, 210658, 264 12, B05B 700, B05C 500, B01D 1508, B05D 102

Patent

active

045827311

ABSTRACT:
Solid films are deposited, or fine powders formed, by dissolving a solid material into a supercritical fluid solution at an elevated pressure and then rapidly expanding the solution through a short orifice into a region of relatively low pressure. This produces a molecular spray which is directed against a substrate to deposit a solid thin film thereon, or discharged into a collection chamber to collect a fine powder. Upon expansion and supersonic interaction with background gases in the low pressure region, any clusters of solvent are broken up and the solvent is vaporized and pumped away. Solute concentration in the solution is varied primarily by varying solution pressure to determine, together with flow rate, the rate of deposition and to control in part whether a film or powder is produced and the granularity of each. Solvent clustering and solute nucleation are controlled by manipulating the rate of expansion of the solution and the pressure of the lower pressure region. Solution and low pressure region temperatures are also controlled.

REFERENCES:
patent: 3981957 (1976-09-01), Brederode et al.
patent: 4012461 (1977-03-01), Brederode
Richard D. Smith, John C. Fjeldsted and Milton L. Lee, "Direct Fluid Injection Interface for Capillary Supercritical Fluid Chromatography-Mass Spectrometry", Journal of Chromatography, 247 (1982), pp. 231-243.
M. E. Paulaitis et al., "Supercritical Fluid Extraction", Reviews in Chemical Engineering, vol. 1, No. 2, 181-183, 237-238, 249, (1983).
W. Worthy, "Supercritical Fluids Offer Improved Separation", Chem. Eng. News, 59 (31), 17 (1981).

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