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Control of transport properties to and from nanoparticle surfaces

A technology of nanoparticles and transfer characteristics, applied in the preparation methods of peptides, chemical instruments and methods, biochemical equipment and methods, etc., can solve problems such as inability to achieve and the effectiveness of nanoparticles

Active Publication Date: 2014-11-19
VIVE CROP PROTECTION INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In practice, however, the effectiveness of nanoparticles does not depend solely on the properties demonstrated in the laboratory
In practical use, many laboratory properties of interest cannot be achieved due to interfering substances and undesired reactions with chemicals in the application environment

Method used

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  • Control of transport properties to and from nanoparticle surfaces
  • Control of transport properties to and from nanoparticle surfaces
  • Control of transport properties to and from nanoparticle surfaces

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0093] Example 1: Preparation of CdTe-CdS nanoparticles encapsulated in PAA

[0094] Weigh an appropriate amount of sodium tellurite, dissolve it in deionized water (ddH 2 10 mM sodium tellurite (Na 2 TeO 3 ) solution. Heat the heating mantle to >100°C. 50 mL of Cd-PAA solution (1.67 mM Cd, irradiated with 254 nm light for 1 h) was placed in a single neck round bottom flask (rbf). To the stirred Cd-PAA solution was added a portion of trisodium citrate (50 mg) and sodium borohydride (NaBH4, 25 mg). 1.25mL Na prepared as above 2 TeO 3 The solution was added to the Cd-PAA solution. A condenser was placed on the rbf, the reaction mixture was heated to reflux in a heating mantle, and reflux was continued for 4h. At the same time, preheat another heating mantle to 50 °C. After 4 hours at reflux, the reaction flask was removed from the heating mantle and allowed to cool to room temperature. At the same time, weigh an appropriate amount of thioacetamide and dissolve it in ...

Embodiment 2

[0095] Example 2: Preparation of CdTe-CdS nanoparticles encapsulated in PAA / PSS

[0096] Weigh an appropriate amount of sodium tellurite and dissolve it in deionized water (ddH 2 O), prepared 10mM sodium tellurite (Na 2 TeO 3 ) solution. The heating mantle was heated to >100°C. 50 mL of Cd-PAA / PSS (PSS weight is 5% or 25% of PAA weight) solution (1.67 mM Cd, irradiated with 254 nm light for 1 hour) was placed in a single neck round bottom flask (rbf). To the stirred Cd-PAA solution was added a portion of trisodium citrate (50 mg) and sodium borohydride (NaBH 4 , 25mg). 1.25mL Na prepared as above 2 TeO 3 The solution was added to the Cd-PAA solution. A condenser was placed on the rbf, the reaction mixture was heated to reflux in a heating mantle, and reflux was continued for 4h. At the same time, preheat another heating mantle to 50 °C. After 4 hours at reflux, the reaction flask was removed from the heating mantle and allowed to cool to room temperature. At the s...

Embodiment 3

[0097] Example 3: Preparation of CdTe-CdS nanoparticles coated with polyelectrolyte bilayers

[0098] Quantum dot samples coated with 1, 2 or 3 bilayers of PAA and PAH were prepared. Green CdTe-CdS quantum dots with PAA stabilizer were prepared according to Example 2, purified by ethanol precipitation, and re-made to 16 times its original concentration (based on solid). Subsequently, deionized distilled water (ddH 2 O) Diluted 333 times. To 100 μL of this solution, PAH (MW=15,000, 40 μL, 0.03 mg / mL) and PAA-Na (MW=2,100, 5 μL, 0.3 mg / mL) solutions were alternately added. After each addition, the mixture was placed on an orbital shaker for 5 minutes before the next solution was added.

[0099] For CdTe-CdS nanoparticles with one bilayer (ie PAH and PAA-Na are added alternately once), after PAH and PAA-Na are added alternately once, the solution leaves the shaker and 90 μL of deionized distilled water is added. For CdTe-CdS nanoparticles with 2 bilayers, after 2 alternate ...

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Abstract

Methods of producing stabilized composite nanoparticles comprising a nanoparticle and a multiple polyelectrolyte stabilizing moiety layer, a method of producing a multilayer stabilized composite nanoparticle, and such nanoparticles.

Description

technical field [0001] This application claims priority to US Provisional Patent Application Nos. 60 / 889,609, filed February 13, 2007, and 60 / 892,927, filed March 5, 2007, both of which are hereby incorporated by reference in their entirety. Background technique [0002] Nanoparticles refer to nanometer-sized materials, such as metals, semiconductors, polymers, etc., which usually have unique properties brought about by their small size. Nanoparticles are of particular interest due to their promise as catalysts, photocatalysts, adsorbents, sensors, and ferrofluids, as well as their material properties for formulation of optical, electrical, and magnetic devices, plastics, and other materials. [0003] In practice, however, the effectiveness of nanoparticles does not depend solely on the properties demonstrated in the laboratory. In practical use, many laboratory properties of interest cannot be achieved due to interferents and undesired reactions with chemicals in the appli...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07K1/00C07K7/08C12Q1/00
Inventor D·安德森J·B·吴J·A·定拉桑
Owner VIVE CROP PROTECTION INC