Process for producing nanoparticles

A technology of metal carboxylates and mixtures, applied in nanotechnology, nanotechnology, chemical instruments and methods, etc., can solve the problems of insufficient particle size control, slow particle growth rate, high agglomeration rate, etc., to achieve simple method and particle agglomeration Minimized, simple cost-effective effect

Inactive Publication Date: 2011-01-19
3M INNOVATIVE PROPERTIES CO
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

However, the starting salt typically requires the use of dilute solutions to avoid relatively high rates of agglomeration, and zinc oxide grown from the salt tends to form agglomerates unsuitable for applications requiring transparency
[0012] Other methods of making nano-sized zinc oxide particles use expensive raw materials (such as zinc alkoxides), require the use of emulsifiers, are complex, generate agglomerates, slow particle growth, have insufficient control over particle size, and / or do not achieve the generally preferred particle size (e.g., an average primary particle size of about 5 nm to about 30 nm)

Method used

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  • Process for producing nanoparticles
  • Process for producing nanoparticles
  • Process for producing nanoparticles

Examples

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example

[0057] 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.

[0058] These examples are for illustration purposes only and are not intended to limit the scope of the appended claims.

[0059] All parts, percentages, ratios, etc. in the examples and 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.

[0060] Primary particle size determination

[0061] The ultraviolet (UV) visible (Vis) spectrometer used to monitor the primary particle size is PerkinElmer TMLambda 35 instrument (available from PerkinElmer Life and Analytical Sciences, Wellesley, MA) with a 1 cm path length UV grade quartz sample cell or cuvette. ...

example 1-4 and comparative example 1

[0080] 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 at a rate of 20°C per minute to a temperature of 120°C 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.

[0081] Using different proportions 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 and DMSO were added to each of this stock solution to prepare a series of samples, as shown in Table 1 below.

[0082] Table 1.

[0083]

[0084] 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 ...

Embodiment 5

[0087] Zinc lactate (Pfaltz & Bauer, Waterbury, CT) was vacuum dried at 100° C. overnight essentially as described above. TGA was performed essentially as described above and the results showed that the zinc lactate contained 4.6% by weight of water after drying.

[0088] DMSO (200 g) was placed in a 1 liter 3 neck round bottom flask. Zinc acetate (28.44 g, 0.155 moles, Alfa Aesar, Ward Hill, MA) and vacuum-dried zinc lactate (37.74 g, 0.155 moles) were added as powders to the flask via a powder addition funnel under mechanical stirring. DMSO (41.9 g) was used to rinse residual zinc acetate or zinc lactate from the powder addition funnel into the round bottom flask. The flask was placed in a silicone oil bath set at 90°C. After the powder had dissolved, a solution of 25% tetramethylammonium hydroxide in methanol (192.1 g, 0.527 moles, Alfa Aesar, Ward Hill, MA) was added to the flask in a steady stream over 15 minutes via a separatory funnel.

[0089]The size of the resulti...

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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] priority statement [0002] This patent application claims priority to US Provisional Application Nos. 61 / 015,990 and 61 / 016,048, filed December 21, 2007, the contents of which are hereby incorporated by reference. technical field [0003] The present invention relates to a process for the preparation of metal oxide or metal oxyhydroxide particles. Background technique [0004] Metal oxides have a variety of uses. In particular, zinc oxide can be used for various purposes including, for example, as a white pigment, a catalyst, one of the components of antibacterial skin protection ointments, and an activator of rubber vulcanization. Sunscreens and wood varnishes contain finely divided zinc oxide as an ultraviolet (UV) absorbing pigment. [0005] Zinc oxide is used as a UV absorber because it does not degrade when exposed to UV light for a long time. However, when the zinc oxide particle size is less than about 20 nanometers (nm), its energy bandgap shifts to highe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
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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