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Rutile-form titanium oxide crystals and mid-infrared filter including same

A rutile type, titanium oxide technology, applied in the direction of titanium dioxide, titanium oxide/hydroxide, chemical instruments and methods, etc., can solve the problem of not being able to display wavelength selectivity

Inactive Publication Date: 2012-05-09
DIC CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, infrared absorption is not selective, so it passes a wide range of wavelengths from the near-infrared region to the mid-infrared region, and cannot show wavelength selectivity for absorption or transmission

Method used

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  • Rutile-form titanium oxide crystals and mid-infrared filter including same
  • Rutile-form titanium oxide crystals and mid-infrared filter including same
  • Rutile-form titanium oxide crystals and mid-infrared filter including same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] Example 1 [Synthesis of 1-Ti-Mn500 doped with manganese ions]

[0086] Add 0.93ml 0.1M Mn(NO 3 ) 2 , Prepare a complex solution of polyethyleneimine / manganese ions (liquid A, the molar ratio of imine / Mn is 500). On the other hand, 28% ammonia water was added dropwise to a solution of titanium lactate (manufactured by Matsumoto Pharmaceutical Co., Ltd., TC310, 20 vol%) to prepare an aqueous solution (liquid B) of pH=9. Take 100ml of liquid B, and slowly add 10ml of liquid A dropwise while stirring at room temperature (25°C). After about one hour, many precipitates were formed from the mixed solution. This precipitate was filtered, washed with water, and dried at room temperature to obtain 8.2 g of a light yellow powder (precursor). From the XRD pattern of the precursor powder, a strong X-ray diffraction peak representing a layered structure appeared on the low angle (2θ is about 3.8°) side ( figure 1 ). That is, the precursor is a complex having a layered structur...

Embodiment 2

[0089] Example 2 [Synthesis of titanium oxide 2-Ti-Mn500 doped with manganese ions]

[0090] 2-Ti-Mn500 was produced in the same manner as in Example 1 except that the firing temperature was changed to 1100°C. The FT-IR spectrum of the thin slice made by mixing this sample (5%) with KBr is as follows Figure 5 shown. By increasing the firing temperature, the infrared transmission peak tends to shift slightly to the short-wavelength side. The center wavelength is 9.46 μm, the half value width is 1.89, and the transmittance is 50%.

Embodiment 3

[0091] Example 3 [Synthesis of titanium oxide doped with iron ions]

[0092] Using Fe(NO 3 ) 3 Instead of the Mn(NO 3 ) 2 (In the polymer metal complex, the molar ratio of ethyleneimine / iron = 1 / 25, 1 / 200, 1 / 500), the precursor synthesis and air calcination (800°C) were carried out under the same conditions to obtain Rutile-type titanium oxide doped with iron ions. Table 1 shows 3 kinds of titanium oxides with different iron doping amounts (iron ion content is as Fe 2 o 3 when converted value).

[0093] [Table 1]

[0094]

[0095] It was confirmed by XRD measurement that these three kinds of titanium oxides were crystals consistent with the rutile structure. In addition, the FT-IR spectrum of each sample (5% in KBr) is as follows Figure 6 shown. It shows that the larger the Fe doping amount, the more the infrared transmittance tends to increase, but at the same time the transmission peak width also becomes wider.

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Abstract

A material for highly versatile mid-infrared filters is provided by precisely regulating the infrared-region absorption intensity of titanium oxide. Rutile-form titanium oxide crystals are produced through a step (I) in which a complex of an aminated basic polymer with a transition metal ion is dispersed or dissolved in an aqueous medium, a step (II) in which the aqueous dispersion or aqueous solution obtained in the step (I) and a water-soluble titanium compound are subjected to hydrolysis reaction in an aqueous medium to thereby obtain a polymer / titania composite of a layered structure in which the complex of an aminated basic polymer with a transition metal ion is sandwiched between layers of titania, and a step (III); in which the layered composite is heated and burned at a temperature of 650 C or higher in an air atmosphere to thereby dope the surface of the titanium oxide crystals with ions of the transition metal and simultaneously cause the crystal phase to grow into rutile. The crystals thus obtained can be used as a mid-infrared filter.

Description

technical field [0001] The present invention relates to a rutile-type titanium oxide crystal capable of effectively transmitting mid-infrared rays, a method for producing the same, a molding material for a mid-infrared filter using the same, and a mid-infrared filter formed by molding the crystal. Background technique [0002] Infrared filters are materials widely used in industries centering on optical devices (cameras, microscopes, displays). The current situation is that although there are many types of infrared filters, most of them are used for near-infrared rays, and the number of materials and filters that can transmit mid-infrared rays is very small. That is, for materials that can be used for the transmission of the mid-infrared rays, there are materials that form a multilayer film on an infrared optical substrate such as quartz, sapphire, and silicon by metal vapor deposition, etc., and the infrared transmission properties are controlled by the interference film. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/053C01G41/00C01G45/00C01G49/00G02B5/22
CPCG02B5/208C01P2002/82C01P2002/72C01G23/053C09C1/3653C01P2002/54G02B1/02C01G23/047C01G41/00C01G45/00G02B5/22
Inventor 诸培新金仁华
Owner DIC CORP
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