Raman markers
AssigneesFabrica Nacional de Moneda y Timbre-Real Casa de la Moneda, Consejo Superior de Investigaciones Cientificas
InventorsAlberto MOURE ARROYO, José Francisco FERNÁNDEZ LOZANO, Victor FUERTES DE LA LLAVE, Esther ENRÍQUEZ PÉREZ, Vicente GARCÍA JUEZ
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Abstract
The present invention relates to a security marker; a method of preparing same; the use of said security marker; a security article, document, or element comprising said marker; the use of said security article, document, or element; an object of value comprising said marker; a method of preparing said security article, document, or element or said object of value; a method for determining the authenticity of said security article, document, or element or said object of value; and a system for determining the authenticity of said security article, document, or element or said object of value.
Claims20
-25. (canceled)
A security marker comprising:
- a glassy matrix comprising at least the elements silicon and oxygen;
- and
- a first crystalline phase formed by crystalline particles embedded in said matrix;
- wherein said particles are feldspars or feldspathoids;
- wherein the average size of said crystalline particles is less than 500 nm;
- and
- wherein an interface exists between the crystalline particles and the glassy matrix;
- and
- wherein the crystalline particles consist of aggregates or agglomerates of nanoparticles, wherein said nanoparticles have an average size between 1 and 50 nm;
- and
- wherein the crystalline particles of the first crystalline phase are formed by a material selected from the group consisting of orthoclase, sanidine, microcline, anorthoclase, albite, oligoclase, andesine, labradorite, banalsite, bytownite, anorthite, leucite, nepheline, analcime, cancrinite, hauyne, lazurite, nosean, petalite, sodalite, and combinations thereof.
A security article, comprising
- a security marker comprising:
- a glassy matrix comprising at least the elements silicon and oxygen;
- and
- a first crystalline phase formed by crystalline particles embedded in said matrix;
- wherein said particles are feldspars or feldspathoids;
- wherein the average size of said crystalline particles is less than 500 nm;
- and
- wherein an interface exists between the crystalline particles and the glassy matrix;
- or
- a security marker obtainable by means of a method comprising the steps of:
- i. providing a mixture comprising:
- a. a source of silicon and oxygen;
- b. a source of aluminum;
- and
- c. a source of at least one element from the group consisting of Na, K, and Ca;
- wherein said sources (a, b, and c) come from the same material or from different materials;
- ii. optionally performing a mechanical treatment on the mixture of step (i) to yield a mixture;
- and
- iii. performing a thermal treatment on the mixture of (i) or (ii) at a temperature comprised between 500° C. and 1500° C. for a period of time between 0.1 min and 50 h;
- wherein said security marker comprises:
- a glassy matrix comprising at least the elements silicon and oxygen;
- and
- a first crystalline phase formed by crystalline particles embedded in said matrix;
- wherein said particles are feldspars or feldspathoids;
- wherein the average size of said particles is less than 500 nm;
- wherein an interface exists between the crystalline particles and the glassy matrix.
Dependencies are inferred from the claim text.