US 12,584,860 B1Granted

Undercoat corrosion monitoring Raman sensor

AssigneeTDA Research, Inc.

InventorsVinh Nguyen, Ronald Lee Cook, Jeannine E. Elliott, Joshua R. Biller

Life of this patent

Estimating the term…

Loading patent…

Abstract

A corrosion detecting composition comprising a nanoparticle and at least one chemically reactive adsorbate associated with the nanoparticle. The chemically reactive adsorbate displays a responsive surface enhanced Raman scattering (SERS) spectral response that is a function of pH. The nanoparticle is contained in a selective carrier; such that the selective carrier allows transport of protons or hydroxide anions to the chemically reactive adsorbate associated with the nanoparticle. Lastly, the selective carrier restricts transport of organic chemical compounds to the at least one chemically reactive adsorbate. This allows the Raman sensor molecules to be blended with paints and coatings prior to application on metal surfaces, and the Raman sensor molecules do not prematurely react with the components of paints or coatings. A Raman detectors can be used to non-destructively interrogate the Raman sensor molecules and detect the pH changes associated with undercoat corrosion.

Claims13

Dependent claims

A corrosion detecting composition:

comprising, a nanoparticles, wherein the nanoparticle comprises a coinage metal selected from the group consisting of gold, silver and copper;
at least one adsorbate associated with the nanoparticle;
wherein the adsorbate displays a responsive surface enhanced Raman scattering (SERS) spectral response that is a function of pH;
and a carrier, wherein the nanoparticle is supported on the carrier;
wherein the at least one adsorbate has a coinage metal attachment function group and a pH sensitive function group;
wherein the at least one adsorbate is selected from the group consisting of 4-mercapto pyridine, 5-methylthio-1,3,4-thiadiazole-2-thiol, mercaptobenzimidazole, 2,5-dimercapto-1,3,4-thiadiazole and 6-mercaptopyridine-3-carboxylic acid;
wherein the at least one adsorbate comprises a protonatable organic functional group that displays a responsive surface enhanced Raman scattering (SERS) spectral response that is a function of pH over the range from pH 4 to pH 12:
wherein the at least one adsorbate contains a coinage metal attachment functional group which is a thiol;
wherein the protonatable organic functional group is selected from the group consisting of pyridine, carboxylate, amine, and aromatic amine;
further comprising a latent reactive epoxy monomer or a latent reactive epoxy resin;
wherein the carrier is dispersed in the latent reactive epoxy monomer or the latent reactive epoxy resin;
wherein the carrier is a mesostructured composition comprising boehmite or pseudoboehmite nanoplatelets and organic pillars, wherein the mesostructured composition exhibits at least one low angle x-ray diffraction line corresponding to a lattice spacing of at least 20 A, wherein the mesostructured composition is formed by reaction of a first surface modified boehmite or pseudoboehmite nanoplatelet composition with a second surface modified boehmite or pseudoboehmite nanoplatelet composition;
and, wherein the first surface modified boehmite or pseudoboehmite nanoplatelet is surface-modified with a p-carboxy-aromatic-maleimide and the second surface modified boehmite or pseudoboehmite nanoplatelet is surface-modified with a-carboxy-Q-thiol and the two are mixed together in water at a pH exceeding 5 to form the mesostructured composition.

10 more elements

A corrosion detecting composition:

comprising, a nanoparticle and at least one chemically reactive adsorbate associated with the nanoparticle;
wherein the chemically reactive adsorbate displays a responsive surface enhanced Raman scattering (SERS) spectral response that is a function of RH:
wherein the nanoparticle is contained in a selective carrier;
wherein the selective carrier allows transport of protons or hydroxide anions to the at least one chemically reactive adsorbate associated with the nanoparticle;
wherein the selective carrier restricts transport of organic chemical compounds to the at least one chemically reactive adsorbate;
wherein the selective carrier prevents chemical reactions between the chemically reactive adsorbate and organic chemical compounds which contact the selective carrier;
wherein the selective carrier is a mesostructured composition comprising boehmite or pseudoboehmite nanoplatelets and organic pillars, wherein the mesostructured composition exhibits at least one low angle x-ray diffraction line corresponding to a lattice spacing of at least 20 Å, wherein the mesostructured composition is formed by reaction of a first surface modified boehmite or pseudoboehmite nanoplatelet composition with a second surface modified boehmite or pseudoboehmite nanoplatelet composition;
and, wherein the first surface modified boehmite or pseudoboehmite nanoplatelet is surface-modified with a p-carboxy-aromatic-maleimide and the second surface modified boehmite or pseudoboehmite nanoplatelet is surface-modified with a-carboxy-Q-thiol and the two are mixed together in water at a pH exceeding 5 to form the mesostructured composition.

5 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/688,628Filed 7 Mar 2022 · us provisional application
Priority: 5 Mar 2021
Granted: 24 Mar 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

G01N 21/658
Raman scattering: enhancement Raman, e.g. surface plasmons
G01N 31/22
Investigating or analysing non-biological materials by the use of the chemical methods specified in the subgroup; Apparatus specially adapted…
G01N 17/00
Investigating resistance of materials to the weather, to corrosion, or to light
G01N 17/04
Investigating resistance of materials to the weather, to corrosion, or to light: corrosion probes