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Method for nanoparticle surface modification

A nanoparticle and surface modification technology, applied in the direction of nanotechnology, nanotechnology, nanostructure manufacturing, etc., can solve problems such as defects in the physical properties of nanoparticles, achieve efficient processing and adaptability, reduce nanoparticle aggregation, and reduce separation processing Effect

Inactive Publication Date: 2009-08-19
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Synthetic modification of nanoparticles can lead to physical property defects

Method used

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  • Method for nanoparticle surface modification
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  • Method for nanoparticle surface modification

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[0074] All solvents and reagents were obtained from Sigma-Aldrich Chemical Company, Milwaukee, WI, unless otherwise noted. Nalco 2326 colloidal silica, commercially available from Nalco Chemical Company (Bedford Park, Illinois, USA). All percentages and amounts are by weight unless otherwise indicated.

[0075] Nuclear magnetic resonance spectroscopy was performed using a 400 MHz Varian NOVA solid state photometer (Palo Alto, CA, USA). Load the sample into a 5mm rotor. Use a 5mm MAS NMR probe to collect 15 N and 13 C CP / MAS. 15 The N spectrum takes liquid ammonia as the reference, and the second reference is 15 N-labeled glycine. The quaternary peak at 55 ppm and the tertiary peak at 45 ppm were used to determine the degree of quaternization.

[0076] Preparation of N-trimethoxysilylpropyl-N,N-dimethylbutylammonium bromide : N,N-dimethylaminopropyltrimethoxysilane (10 g; Gelest, Inc., Morrisville, Pennsylvania, USA), and dissolved in diethyl ether (50 g; butyl bromid...

example 1

[0080] A mixture of Nalco 2326 colloidal silica (100 g), N,N-dimethylaminopropyltrimethoxysilane (5.88 g) and 1-methoxy-2-propanol (117.5 g) was prepared in a Mix in a 3 neck round bottom flask with a mechanical stirrer at 80°C for 1 hour. Lauryl chloride (5.8 g) dissolved in 1-methoxy-2-propanol (20 g) was added to the mixture, which was then stirred at a temperature of 80°C for a further 18 hours. The surface-modified nanoparticles (15.03 g) were then isolated by drying in an oven at 130°C. The surface-modified nanoparticles are soluble in water at levels greater than 20% by weight, resulting in clear solutions with no increase in solution viscosity. according to 15 N NMR spectroscopy showed that the quaternization of the amine was greater than 20%.

example 2

[0082]A mixture of Nalco 2326 colloidal silica (100 g), N,N-dimethylaminopropyltrimethoxysilane (5.88 g) and 1-methoxy-2-propanol (117.5 g) was prepared using a mechanical Mix in a stirrer 3 neck round bottom flask at 80°C for 1 hour. To the mixture was added butyl bromide (3.88 g) dissolved in 1-methoxy-2-propanol (20 g) and stirring was continued for an additional 18 hours while maintaining the reaction temperature at 80°C. The surface-modified nanoparticles (22.3 g) were then isolated by drying in an oven at 130°C. The surface-modified nanoparticles are soluble in water at levels greater than 20% by weight, resulting in clear solutions with no increase in solution viscosity. The surface-modified nanoparticles are soluble in water at levels greater than 20% by weight, and the resulting solution has no increase in solution viscosity. according to 15 N NMR spectroscopy showed that the quaternization of the amine was greater than 20%.

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Abstract

The present disclosure discloses a method for making surface-modified nanoparticles. The surface of a nanoparticle is modified with an aminorganosilane and an alkylating agent in a one-pot synthesis to provide alkylamine surface-modified nanoparticles.

Description

technical field [0001] The present invention relates to a method for modifying the surface of nanoparticles. Background technique [0002] Nanotechnology is a technology that forms and utilizes materials, devices and systems by manipulating nanoscale substances to understand new molecular structures and phenomena. Today, controlling matter at the nanoscale plays an important role in numerous fields of science and engineering. [0003] The modification of inorganic and organic nanoparticles has facilitated their usefulness in many applications. The average diameter of the nanoparticles provides greater surface area and more functional groups. [0004] Nanoparticles can be surface-modified using synthetic routes. Nanoparticles can have functional groups resulting from surface oxidation or intentional modification to facilitate handling and transport requirements. Additionally, nanoparticles can be dispersed in a solvent and subsequently reacted with selected reagents to fo...

Claims

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Application Information

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IPC IPC(8): B82B3/00
CPCC09C1/3684C09C1/3081C09C1/24C01P2004/64C09C3/12C09C1/043C09C1/407C01P2002/86C01G25/02C01G23/047B82Y30/00
Inventor 小吉米·R·巴兰杜安·D·范斯勒
Owner 3M INNOVATIVE PROPERTIES CO
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