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Mixed ligand surface-modified nanoparticles

A surface modification nanotechnology, surface modification technology, applied in the fields of nanotechnology, nanotechnology, nanotechnology for materials and surface science, can solve the problems of high agglomeration rate, not easy to disperse, hinder industrial application, etc. Eliminate the effect of agglomeration

Inactive Publication Date: 2011-01-19
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the starting salts generally require the use of dilute solutions to avoid relatively high rates of agglomeration, and zinc oxide grown from such salts tends to form agglomerates unsuitable for applications requiring transparency
In addition, zinc oxide produced from such salts is often not readily dispersible in water, polar organic solvents, or certain other media due to its surface-modified nature, and dispersions of zinc oxide often lack long-term stability
These properties hinder its industrial application

Method used

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  • Mixed ligand surface-modified nanoparticles
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Examples

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preparation example Construction

[0031] Preparation of Surface-Modified Nanoparticles

[0032] Mixed ligand-modified nanoparticles of the compositions of the present invention can be prepared by any of a variety of known or hereafter developed particle surface modification methods. Useful methods include those described, for example, in US Patent Application Publication No. 2004 / 0033270A1 (Kropf et al.), the specification of which is incorporated herein by reference.

[0033] For example, metal oxide or oxyhydroxide nanoparticles (preferably, for a wide variety of applications, have an average primary particle size of 1 nanometer (nm) (more preferably about 3 nm) by any method that provides nanoscale particles. Most preferably about 5 nm) to about 50 nm (more preferably about 30 nm, most preferably about 20 nm), where any lower end of the size range can be paired with any upper limit. The nanoparticles can then be dispersed into a liquid medium (e.g. alcohol, ether or polar non- protic solvent) and optiona...

example

[0072] Objects and advantages of this invention are further illustrated by the following examples, but the particular materials and amounts thereof recited in these examples, as well as other conditions and details, should not be construed to unduly limit this invention.

[0073] These examples are for illustration purposes only, and are not intended to limit the scope of the appended claims.

[0074] All parts, percentages, ratios, etc. in the examples, as well as in the remainder of the specification, are by weight unless otherwise indicated. Solvents and other reagents used were obtained from Sigma-Aldrich Chemical Company, St. Louis, MO unless otherwise indicated.

[0075] Primary particle size determination

[0076] Ultraviolet (UV)-Visible (Vis) Spectrophotometer for Monitoring Primary Particle Size is PerkinElmer TM A Lambda model 35 instrument (obtained from PerkinElmer Life and Analytical Sciences, Wellesley, MA) equipped with a 1 cm path length UV grade quartz sa...

example 1-3 and comparative example 1 and 2

[0097] Zinc lactate (Pfaltz & Bauer, Waterbury, CT) was dried overnight in a vacuum oven at 100°C. Zinc lactate was subjected to thermogravimetric analysis (TGA) before and after drying. The temperature of the thermogravimetric analyzer was raised to 120°C at a rate of 20°C per minute and held at this temperature for 20 minutes. The zinc lactate contained 15.7% by weight of water before drying in a vacuum oven. After drying, the zinc lactate contained 2.4% by weight of water.

[0098] Using different ratios of zinc lactate (Zn(Lac) 2 ) and zinc acetate (Zn(Ac) 2 ) to synthesize zinc oxide. A 0.52 mmol / g Zn(Ac)2 stock solution. Different amounts of Zn(Lac) 2 DMSO and DMSO were added to each portion of this stock solution to prepare a series of samples as shown in Table 1 below.

[0099] Table 1.

[0100]

[0101] Each sample was placed in a 40 mL vial, and 20.3 g of DMSO and a magnetic stir bar were added to each vial. Each vial was then placed in an oil bath set...

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Abstract

A composition comprises surface-modified nanoparticles of at least one amphoteric metal oxide or oxyhydroxide. The nanoparticles bear, on at least a portion of their surfaces, a surface modification comprising (i) at least one surface modifier selected from lactate, thiolactate, and mixtures thereof, and (ii) at least one surface modifier selected from halide, nitrate, acetate, carbonate, formate, propionate, sulfate, bromate, perchlorate, tribromoacetate, trichloroacetate, trifluoroacetate, carboxylate comprising from one to about four alkyleneoxy moieties, chlorate, and mixtures thereof.

Description

[0001] claim of priority [0002] This patent application claims priority to US Provisional Application Nos. 61 / 016,048 and 61 / 015,990, both filed on December 21, 2007, the contents of which are hereby incorporated by reference. technical field [0003] The present invention relates to compositions comprising surface-modified metal oxide or metal oxyhydroxide nanoparticles, and in another aspect, the present invention relates to articles comprising the compositions. Background technique [0004] Metal oxides have many uses. Zinc oxide, in particular, can be used for a variety of purposes including, for example, as a white pigment, as a catalyst, as a component of antibacterial skin care ointments, and as an activator for rubber vulcanization. Sunscreens and wood varnishes contain finely divided zinc oxide as an ultraviolet (UV) absorbing pigment. [0005] Since zinc oxide does not degrade when exposed to UV light for extended periods of time, it can be used as a UV absorb...

Claims

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Application Information

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IPC IPC(8): C09C1/04C01G9/02C09C3/08C01F7/02
CPCC01G21/02C09C1/043C01G45/02C01G37/02C01G19/02C01G1/02C01F7/02C09C3/08C01G9/02C01G31/02C01G15/00Y10S977/811C01P2004/64C01G23/04Y10S977/773B82Y30/00A61P11/08A61P11/14A61P29/00A61P31/00A61P5/00A61P7/10
Inventor 蒂莫西·D·邓巴
Owner 3M INNOVATIVE PROPERTIES CO
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