Encapsulation of nanoclusters in dried gel materials via an inve

Details Encapsulation of nanoclusters in dried gel materials via an inve Encapsulation of nanoclusters in dried gel materials via an inve

1996-06-11

1998-09-29

Gulakowski, Randy

Coating processes

Particles, flakes, or granules coated or encapsulated

Solid encapsulation process utilizing an emulsion or...

427216, 427219, 4273722, 523211, 42840224, 428404, B01J 1302

Patent

active

058143700

ABSTRACT:
A dried gel material sterically entrapping nanoclusters of a catalytically active material and a process to make the material via an inverse micelle/sol-gel synthesis. A surfactant is mixed with an apolar solvent to form an inverse micelle solution. A salt of a catalytically active material, such as gold chloride, is added along with a silica gel precursor to the solution to form a mixture. To the mixture are then added a reducing agent for the purpose of reducing the gold in the gold chloride to atomic gold to form the nanoclusters and a condensing agent to form the gel which sterically entraps the nanoclusters. The nanoclusters are normally in the average size range of from 5-10 nm in diameter with a monodisperse size distribution.

REFERENCES:
patent: 4594134 (1986-06-01), Hanada et al.
patent: 5378790 (1995-01-01), Michalczyk et al.
patent: 5589537 (1996-12-01), Golden et al.
patent: 5597614 (1997-01-01), Noguchi et al.

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