WO2024253553 - ECOLOGICAL METHOD OF PREPARING CAVITARY NANOPARTICLES OF NOBLE METAL
National phase entry is expected:
Publication Number
WO/2024/253553
Publication Date
12.12.2024
International Application No.
PCT/RO2023/000014
International Filing Date
23.11.2023
Title **
[English]
ECOLOGICAL METHOD OF PREPARING CAVITARY NANOPARTICLES OF NOBLE METAL
[French]
PROCÉDÉ ÉCOLOGIQUE DE PRÉPARATION DE NANOPARTICULES CAVITAIRES DE MÉTAL NOBLE
Applicants **
INSTITUTUL NAŢIONAL DE CERCETARE-DEZVOLTARE PENTRU FIZICĂ TEHNICĂ - IFT IAŞI
Inventors
HEREA, Dumitru-Daniel
LUPU, Nicoleta
CHIRIAC, Horia
STOIAN, George
DRAGOŞ-PÎNZARU, Oana-Georgiana
BUEMA, Gabriela
STAVILĂ, Cristina
GRIGORAŞ, Marian
LĂBUŞCĂ, Luminiţa
ZARĂ, Camelia Mihaela
MINUTI, Anca Emanuela
ABABEI, Gabriel
GHERCA, Daniel
Priority Data
a202300290
09.06.2023
RO
Application details
| Total Number of Claims/PCT | * |
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International Searching Authority |
EPO
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| Recordal of a Change of the Applicant's Name/Address |
Change of Applicant's Name and Address
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| Type of Assignment |
The Standard Agent's Assignment
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| Applicant's Legal Status |
Legal Entity
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| Entry into National Phase under |
Chapter I
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| Patent Delivery |
Send the Letters Patent by Courier
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| Translation |
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Quotation for National Phase entry
| Country | Stages | Total | |
|---|---|---|---|
| China | Filing, Examination, Granting | 1886 | |
| EPO | Filing, Examination, Granting | 8218 | |
| Japan | Filing, Examination, Granting | 1906 | |
| South Korea | Filing, Examination, Granting | 1454 | |
| USA | Filing, Examination, Granting | 4740 |
Total:
18,204
The term for entry into the National Phase has expired. This quotation is for informational purposes only
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Abstract[English]
The invention refers to an ecological/green process for obtaining gold or silver cavity particles with nanometric and/or micrometric dimensions, stabilized on the surface with natural compounds starting from core-shell type nanoparticles, in which the core is magnetic and the shell /mantle consists of a nanometric or micrometric layer of noble metal, cavity nanostructures being recommended for applications such as lithium-ion batteries, catalysis, drug transport, sensors, water treatment, nanoreactors and photosensitive pigment solar cells. The process according to the invention consists in subjecting the core-shell nanoparticles to a corrosion/dissolution process with an extract from lemon juice or another acidic extract resulting from a natural product in a concentration between 1...100% in the corrosion solution/ dissolution, a process by which the magnetic core is dissolved, partially or totally, either more slowly at room temperature or more rapidly at temperatures between 60...100°C, with the noble metal shell being kept in an undissolved state during the corrosion process /dissolution, followed by successive water washing of the cavity particles, in combination with ultracentrifugation processes and redispersion of the final product in water or other water-based solutions, possibly under the influence of ultrasound.[French]
L'invention concerne un procédé écologique/vert pour obtenir des particules de cavités d'or ou d'argent ayant des dimensions nanométriques et/ou micrométriques, stabilisées sur la surface avec des composés naturels à partir de nanoparticules de type cœur-écorce, le cœur étant magnétique et l'écorce/le manteau consistant en une couche nanométrique ou micrométrique de métal noble, des nanostructures de cavités étant recommandées pour des applications telles que des batteries au lithium-ion, une catalyse, un transport de médicament, des capteurs, un traitement d'eau, des nanoréacteurs et des cellules solaires à pigment photosensible. Le procédé selon l'invention consiste à soumettre les nanoparticules cœur-écorce à un procédé de corrosion/dissolution avec un extrait de jus de citron ou d'un autre extrait acide obtenu d'un produit naturel à une concentration entre 1 et 100 % dans la solution/dissolution de corrosion, un procédé par lequel le noyau magnétique est dissous, partiellement ou totalement, soit plus lentement à température ambiante, soit plus rapidement à des températures entre 60 et 100 °C, le cœur de métal noble étant maintenue dans un état non dissous pendant le procédé de corrosion/dissolution, suivi d'un lavage à l'eau successif des particules de cavités, en combinaison avec des procédés d'ultracentrifugation et une redispersion du produit final dans de l'eau ou d'autres solutions à base d'eau, éventuellement sous l'influence d'ultrasons.