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Heteronuclear radioisotope nanoparticle of core-shell structure and preparation method thereof

a radioisotope and core-shell technology, applied in the direction of instruments, liquid/fluent solid measurements, other chemical processes, etc., can solve the problems of aggregation among the nanoparticles, the risk of colloid stabilizer itself being activated, and the difficulty of mass production at room temperature, so as to reduce the risk of oxidization or agglomeration, and reduce the risk of aggregation

Inactive Publication Date: 2013-04-11
KOREA ATOMIC ENERGY RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The core-shell structure heteronuclear radioisotope nanoparticle has two different radioisotopes integrated into one core which reduces oxidation and agglomeration, making it safer. The nanoparticle emits heterogeneous gamma rays which can be used as a tracer for detecting flow of fluid in extreme conditions and measuring the variation in water ratio or behavior characteristics. The nanoparticle is coated with SiO2 which is not activated by the irradiation of neutron, preventing agglomeration. The colloid stabilizer is minimally activated during the process of activating the nanoparticle, ensuring the quality and quantity of information obtained from the radioisotope.

Problems solved by technology

However, the metal nanoparticles made by these methods have rather irregular granularity of the particles, and mass production is rather difficult at room temperature.
However, in fabricating radioactive nanoparticles, there is a risk that the colloid stabilizer itself can be activated.
However, if the colloid stabilizer is eliminated in the fabricating process of the metal nanoparticles, aggregation can occur among the nanoparticles due to considerably low mass ratio to surface area, and as a result, the nanoparticles grow and cannot serve as a tracer for flow detection of a target of the research.
However, in implementing this to high temperature and high pressure industrial process, there is a problem that the radioisotope (125I) is separated from the gold nanoparticle.
However, since radioisotopes such as 125I and 14C are adsorbed onto soil and emits low energy of radiation, it is difficult to detect the behavior in the soil sample, not to mention the flow in the industrial processing.

Method used

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  • Heteronuclear radioisotope nanoparticle of core-shell structure and preparation method thereof

Examples

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example 1

Step 1. Preparation of Heteronuclear Nanparticle Core by Radiation Reduction

[0077]0.19 mmol of HAuCl43H2O (0.078 g) and AgNO3(0.033 g) were dispersed in tertiary distilled water (376 ml) so that Au and Ag were at 1:1 mole ratio. To the fluid in which HAuCl43H2O and AgNO3 were dispersed, polyvinylpyrrolidone (1 g) as colloid stabilizer and isopropanol (24 ml) were added and mixed. The reacted fluid underwent nitrogen purging to remove oxygen existing in the solution, and 60Co-γ was irradiated for 3 hr, in a manner in which the total dose of radiation was 30 kGy. The reacted fluid was yellow before reaction, and turned into purple after irradiation so that Au—Ag nanoparticle, which was stabilized with polyvinylpyrrolidone, can be prepared.

Step 2. Preparation of Heteronuclear Nanonparticle with Core-Shell Structure by Sol-Gel Reaction

[0078]Colloid fluid (4 ml), in which the Au—Ag nanoparticle core stabilized with polyvinylpyroolidone and prepared in step 1, was mixed with isopropanol (...

example 2

[0081]The radioisotope nanoparticle having Au—Ni core and SiO2 shell was prepared in the same manner as that in Example 1, except that Ni instead of Ag was used as the nuclides of the nanoparticle core and 0.19 mmol of HAuCl43H2O (0.078 g) and Ni(NO3)26H2O (0.055 g) were used to 1:1 mole ratio.

example 3

[0082]The radioisotope nanoparticle having Au—Co core and SiO2 shell was prepared in the same manner as that in Example 1, except that Co instead of Ag was used as the nuclides of the nanoparticle core and 0.19 mmol of HAuCl43H2O (0.078 g) and CoCl26H2O (0.045 g) were used to 1:1 mole ratio.

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Abstract

Heteronuclear radioisotope nanoparticle of core-shell structure and a preparation method thereof are provided. The Heteronuclear radioisotope nanoparticle of core-shell structure comprising core of two different radioisotopes selected from a group consisting of 198Au, 63Ni, 110mAg, 64Cu, 60Co, 192Ir and 103Pd, and a shell comprising Si02 surrounding the core.The Heteronuclear radioisotope nanoparticle of core-shell can be used as a tracer for the purpose of detecting variation of volume ratio or for the evaluation of the behavior characteristic of a water resource, based on information about phase ratio in the flow of multiphase fluid existing in a process which is operated under extreme condition such as high temperature and / or high pressure conditions.

Description

CROSS-REFERENCES TO RELATED APPLICATIONS[0001]This patent application claims the benefit of priority from Korean Patent Application No. 10-2011-0101302, filed on Oct. 5, 2011, the contents of which are incorporated herein by reference in its entirety.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to heteronuclear radioisotope nanoparticle of core-shell structure and a preparation method thereof.[0004]2. Description of the Related Art[0005]Radioisotope refers to a matter in which atomic nucleus thereof emits radioactive rays without requiring external influence such as pressure, temperature, chemical treatment, to turn into different type of atomic nucleus. The generally available radioisotope includes 198Au, 63Ni, 110mAg, 64Cu, 60Co, 192Ir, or 103Pd.[0006]In the industrial application, open radioisotope generally serves as a tracer. That is, by tracing radioactive rays emitted from the radioisotope by a measuring device, it is possible ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B05D1/00
CPCB05D1/00Y10S977/902G21G4/06B01J13/18B82Y40/00B82B1/00B82B3/00B82Y30/00G01F1/7042G21H5/02
Inventor JUNG, SUNG-HEECHOI, SEONG-HOKIM, JONG-BUMMOON, JINHOJUNG, JIN-HYUCK
Owner KOREA ATOMIC ENERGY RES INST
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