Organic or organometallic template mediated clay synthesis
A method is described for incorporating diverse varieties of intercalates or templates directly during hydrothermal synthesis of clays such as hectorite or montmorillonite-type layer-silicate clays. For a hectorite layer-silicate clay, refluxing a gel of silica sol, magnesium hydroxide sol and lithium fluoride for two days in the presence of an organic or organometallic intercalate or template results in crystalline products containing either (a) organic dye molecules such as ethyl violet and methyl green, (b) dye molecules such as alcian blue that are based on a Cu(II)-phthalocyannine complex, or (c) transition metal complexes such as Ru(II)phenanthroline and Co(III)sepulchrate or (d) water-soluble porphyrins and metalloporphyrins. Montmorillonite-type clays are made by the method taught by U.S. Pat. No. 3,887,454 issued to Hickson, Jun. 13, 1975; however, a variety of intercalates or templates may be introduced. The intercalates or templates should have (i) water-solubility, (ii) positive charge, and (iii) thermal stability under moderately basic (pH 9-10) aqueous reflux conditions or hydrothermal pressurized conditions for the montmorillonite-type clays. 22 figures.
- DOE Contract Number:
- W-31109-ENG-38
- Assignee:
- Dept. of Energy, Washington, DC (United States)
- Patent Number(s):
- US 5308808; A
- Application Number:
- PPN: US 7-836747
- OSTI ID:
- 7198233
- Resource Relation:
- Patent File Date: 19 Feb 1992
- Country of Publication:
- United States
- Language:
- English
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Organic or organometallic template mediated clay synthesis
Preparation of hectorite clays utilizing organic and organometallic complexes during hydrothermal crystallization