PREPARATION OF STABLE SILVER COLLOIDS

A method is described for producing highly stable silver colloidal solutions by reducing silver nitrate with lithium citrate. In the method, the main steps consist of: (a) heating a first quantity of water to a first predetermined temperature; (b) adding a second quantity of silver nitrate to the wa...

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Bibliographische Detailangaben
Hauptverfasser:	WHITE, PETER, CYRIL, HJORTKJAER, JAKOB, HOWIE
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	CASTING CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY CHEMISTRY FERROUS OR NON-FERROUS ALLOYS MAKING METALLIC POWDER MANUFACTURE OF ARTICLES FROM METALLIC POWDER METALLURGY PERFORMING OPERATIONS PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL POWDER METALLURGY PRETREATMENT OF RAW MATERIALS PRODUCTION AND REFINING OF METALS THEIR RELEVANT APPARATUS TRANSPORTING TREATMENT OF ALLOYS OR NON-FERROUS METALS WORKING METALLIC POWDER
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Beschreibung
Zusammenfassung:	A method is described for producing highly stable silver colloidal solutions by reducing silver nitrate with lithium citrate. In the method, the main steps consist of: (a) heating a first quantity of water to a first predetermined temperature; (b) adding a second quantity of silver nitrate to the water; (c) heating the mixture to a second predetermined temperature; (d) adding a third quantity of an aqueous lithium citrate solution to the mixture; (e) maintaining the mixture at the second predetermined temperature for a predetermined time; and (f) cooling the mixture. The mixing process is accompanied by constant stirring. The colloid exhibits high light-scattering properties and intense SERS or SERRS spectra with low background fluorescence levels and a long shelf life, making it particularly suitable for Raman spectroscopy.