Supercritical fluid molecular spray thin films and fine powders

Details Supercritical fluid molecular spray thin films and fine powders Supercritical fluid molecular spray thin films and fine powders

1986-03-12

1988-03-29

Lusignan, Michael R.

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

At least one aryl ring which is part of a fused or bridged...

210656, 264 12, 525545, 525546, 118300, 118308, B01D 1508, B29B 900, C08K 334, C08L 2712

Patent

active

047344512

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. The solvent is vaporized and pumped away. Solution pressure is varied 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. Solution temperature is varied in relation to formation of a two-phase system during expansion to control porosity of the film or powder. A wide variety of film textures and powder shapes are produced of both organic and inorganic compounds. Films are produced with regular textural feature dimensions of 1.0-2.0 .mu.m down to a range of 0.01 to 0.1 .mu.m. Powders are formed in very narrow size distributions, with average sizes in the range of 0.02 to 5 .mu.m.

REFERENCES:
patent: 3765922 (1973-10-01), Chisholm
patent: 3981957 (1976-09-01), van Brederode et al.
patent: 4004176 (1977-01-01), Otake et al.
patent: 4012461 (1977-03-01), van Brederode
patent: 4150995 (1979-04-01), Moritsu et al.
patent: 4460637 (1984-07-01), Miyamoto et al.
patent: 4590119 (1986-05-01), Kawakami et al.
Johnson, Otto H., Germanium and Its Inorganic Compounds, 7/21/52, pp. 431, 443-447.
V. J. Krukonis, Supercritical Fluid Nucleation of Difficult-to-Comminute Solids, presented at 1984 meeting, AIChE, San Francisco, Nov. 25-30, 1984, and published Nov. 1985.

Affiliated with

Also associated with

Rating

Supercritical fluid molecular spray thin films and fine powders does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Supercritical fluid molecular spray thin films and fine powders, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Supercritical fluid molecular spray thin films and fine powders will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1089464