Functional materials and articles

Abstract

Provided are: a composite oxide ceramic having high antiviral activity; a functional material; and an article comprising the composite oxide ceramic and / or the functional material. A composite oxide ceramic according to one aspect of the present invention is a composite oxide ceramic containing cerium and molybdenum and having antiviral activity. A functional material according to one aspect of the present invention is a functional material prepared by mixing the composite oxide ceramic and a photocatalyst and / or a material having antimicrobial activity. An article according to one aspect of the present invention is an article having the composite oxide ceramic and / or the functional material on at least a part of the surface thereof.

Description

[Technical Field]

[0001] The present invention relates to a complex oxide ceramic, a functional material, and an article comprising the complex oxide ceramic and / or the functional material. [Background technology]

[0002] The global spread of the novel coronavirus (COVID-19) has increased the threat of a global viral pandemic. Once a viral pandemic occurs, it will take at least several months for a vaccine to become available in medical institutions, making research into prevention and spread control an urgent issue.

[0003] Inorganic antiviral materials have a shorter history than organic materials. However, inorganic antiviral materials have been actively researched in recent years because they are effective against a variety of viruses, can be used over a relatively wide temperature range, and viruses are less likely to acquire resistance. To date, antiviral activity has been reported for metals such as Ag and Cu, photocatalysts such as TiO2, ZnO, CaO, and the like, and they are actually used. Patent Document 1 discloses technology related to composite oxide ceramics that combine self-water repellency with antibacterial and antiviral properties. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] International Publication No. 2020 / 017493 Summary of the Invention [Problem to be solved by the invention]

[0005] However, conventional inorganic antiviral materials have problems such as coloration and reduced activity due to oxidation, etc., and limitations on the environment in which they are used (need for light, alkalinization). For this reason, there is a need for the development of new inorganic antiviral materials with high antiviral activity that can solve these problems. Therefore, an object of the present invention is to provide a composite oxide ceramic with high antiviral activity, a functional material, and an article comprising the composite oxide ceramic and / or the functional material. [Means for solving the problem]

[0006] A composite oxide ceramic according to one embodiment of the present invention is a composite oxide ceramic containing cerium and molybdenum and having antiviral activity.

[0007] The composite oxide ceramics mentioned above are Ce2Mo3O 12 The composite oxide ceramic may be represented by the following formula:

[0008] The composite oxide ceramics mentioned above are Ce2Mo4O 15 The composite oxide ceramic may be represented by the following formula:

[0009] The composite oxide ceramics mentioned above are Ce2Mo3O 13 The composite oxide ceramic may be represented by the following formula:

[0010] The above composite oxide ceramics are Ce(MoO4)2, Ce2MoO6, Ce2(MoO4)3, Ce2Mo3O 13 , Ce2Mo4O 15 , Ce6(MoO4)8(Mo2O7), or Ce8Mo 12 O 49 The composite oxide ceramic may be represented by the following formula:

[0011] The composite oxide ceramics may be composite oxide ceramics that show a virus reduction rate of 99% or more after 6 hours by a film adhesion method.

[0012] The composite oxide ceramics may be composite oxide ceramics that have a virus reduction rate of 99.99% or more after 6 hours by the film adhesion method.

[0013] The composite oxide ceramics described above may be in the form of a sintered body.

[0014] A functional material according to one aspect of the present invention is a functional material in which the above-mentioned composite oxide ceramic is mixed with a material having photocatalytic and / or antibacterial properties.

[0015] In the above-described functional material, the antibacterial material may contain at least one of an oxide containing La and Mo and an oxide containing La, Ce and Mo.

[0016] An article according to one aspect of the present invention is an article having the above-mentioned composite oxide ceramic and / or the above-mentioned functional material on at least a portion of the surface thereof. [Effects of the Invention]

[0017] According to the present invention, it is possible to provide a composite oxide ceramic having high antiviral activity, a functional material, and an article comprising the composite oxide ceramic and / or the functional material. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is a flowchart showing an example of a citric acid polymerization method. [Figure 2] 1 is a flowchart showing an example of a hydrothermal synthesis method. [Figure 3] FIG. 1 shows the results of XRD measurement of each sample. [Figure 4] 1 is a table showing the composition analysis results (ICP-OES, XPS) of each sample. [Figure 5] 1 shows scanning electron microscope (SEM) photographs of each sample. [Figure 6] 1 is a flowchart showing the procedure for evaluating antiviral activity. [Figure 7]1 is a graph showing the results of antiviral evaluation of each sample. DETAILED DESCRIPTION OF THE INVENTION

[0019] The composite oxide ceramic according to this embodiment is a composite oxide ceramic containing cerium (Ce) and molybdenum (Mo) and having antiviral activity. The composition ratio (ionic ratio) of cerium (Ce) and molybdenum (Mo) contained in the composite oxide ceramic is not particularly limited, but may be, for example, Ce:Mo=2:3 or Ce:Mo=1:2. The amount of oxygen atoms (O) contained in the composite oxide ceramic may be stoichiometric or may deviate from the stoichiometric composition. In other words, the composite oxide ceramic may be a non-stoichiometric compound.

[0020] The preferred forms of the composite oxide ceramic according to this embodiment are Ce(MoO), CeMoO, Ce(MoO), CeMoO 13 , Ce2Mo4O 15 , Ce6(MoO4)8(Mo2O7), or Ce8Mo 12 O 49 A particularly preferred embodiment of the composite oxide ceramic according to this embodiment is CeMoO 12 , Ce2Mo4O 15 , or Ce2Mo3O 13 It is a composite oxide ceramic expressed by the formula:

[0021] The composite oxide ceramic of this embodiment may further contain other elements to the extent that the effect is not impaired. Examples of other elements include transition metal elements. The transition metal elements may be contained as oxides, or may be contained in other forms without forming oxides. In this embodiment, the content of the other elements is preferably 20 mass % or less, more preferably 10 mass % or less, and even more preferably 5 mass % or less, based on the total amount of the composite oxide ceramic containing the other elements.

[0022] The composite oxide ceramic of this embodiment may be crystalline, such as a single crystal or polycrystal, or amorphous, such as glassy, ​​or may be a combination of crystalline and amorphous parts. The crystalline phase may be a single phase, or a combination of two or more different phases.

[0023] As described above, the composite oxide ceramic according to this embodiment has antiviral activity. For example, the composite oxide ceramic according to this embodiment exhibits a virus reduction rate of 99% or more, preferably 99.99% or more, after 6 hours using a film adhesion method.

[0024] The shape of the composite oxide ceramic of this embodiment is not particularly limited, and can be formed into a desired shape depending on the application. For example, it may be formed into a sintered body sintered into a desired shape by the method described below, or the sintered body may be pulverized into powder. By using the composite oxide ceramic of this embodiment as a powder, the surface area per mass is large, and antiviral properties can be efficiently exhibited.

[0025] This embodiment can provide an article having the complex oxide ceramic on at least a portion of its surface. The surface of this article having the complex oxide ceramic has antiviral properties. The article of this embodiment can be applied to any article requiring antiviral properties. Examples of such articles include housings for electronic devices such as personal computers and smartphones; plumbing fixtures for bathrooms, washrooms, kitchens, etc.; and medical supplies such as masks and white coats. In this embodiment, a portion of the surface of the article may be a sintered body of the complex oxide ceramic, or the article may have a powder of the complex oxide ceramic supported on its surface.

[0026] The method for supporting the composite oxide ceramic powder on the surface of an article is appropriately selected depending on the article. For example, a composite oxide ceramic film may be formed by spraying the composite oxide ceramic powder onto the surface of an article using an aerosol deposition method or the like. Alternatively, a composite oxide ceramic film may be formed by combining the composite oxide ceramic powder with a known binder resin and a solvent, and applying the resulting ink or paste to the surface of a desired article. The application method is not particularly limited, and examples include application methods such as spray coating, dip coating, and spin coating, and printing methods such as flexographic printing, screen printing, and inkjet printing. Alternatively, the composite oxide ceramic powder of this embodiment may be mixed with a resin and the resin may be molded to form a desired article. Alternatively, a composite oxide ceramic film may be formed on the surface of an article using a physical vapor deposition (PVD) method such as sputtering or pulsed laser deposition (PLD). In this case, a sintered body of the composite oxide ceramic may be used as a target.

[0027] Alternatively, a substrate such as a resin film, paper, glass, fiber, or metal may be prepared, and a laminate having a film containing the composite oxide ceramic according to one embodiment may be formed on the substrate by the above-described method. The laminate may then be attached to any desired article.

[0028] For example, by applying the composite oxide ceramic powder to fibers such as cloth or nonwoven fabric using the above-mentioned method, it is possible to produce masks, lab coats, etc. with excellent antiviral properties. Also, the composite oxide ceramic of this embodiment may be mixed with a photocatalyst (titanium oxide, titanium apatite, etc.) to form a functional material. Furthermore, a functional material may be formed by mixing the composite oxide ceramic of this embodiment with an antibacterial material. Because the composite oxide ceramic of this embodiment has excellent antiviral properties, by combining it with an antibacterial material, a functional material having both antiviral and antibacterial properties can be formed. Examples of materials with antibacterial properties include, but are not limited to, LMO (oxides containing La and Mo) and LCMO (oxides containing La, Ce, and Mo). Such functional materials may be provided on at least a portion of the surface of an article to form an article according to this embodiment.

[0029] The method for producing the composite oxide ceramic of this embodiment is not particularly limited, and can be obtained by forming a composite oxide containing cerium (Ce) and molybdenum (Mo) and firing it. Suitable production methods include the citric acid polymerization method and hydrothermal synthesis method described below, but production may also be performed by, for example, the solid-state reaction method described below or other production methods. The citric acid polymerization method, hydrothermal synthesis method, and solid-state reaction method will be described below.

[0030] <Citric acid polymerization method> The citric acid polymerization method will be described with reference to Fig. 1. Fig. 1 is a flow chart showing an example of the citric acid polymerization method.

[0031] The citric acid polymerization method of the present embodiment includes a gelation step of adding an oxycarboxylic acid and a glycol to an aqueous solution containing a cerium-containing compound and a molybdenum-containing compound, and then heating and stirring the solution to cause an ester reaction between the oxycarboxylic acid and the glycol to form a gel; a drying step of drying the gel obtained in the gelling step; a calcination step of calcining the powder obtained by drying the gel; Equipped with. The citric acid polymerization method has the advantage that it is possible to obtain a composite oxide ceramic with excellent uniformity and high density at a relatively low temperature.

[0032] In the gelation step, first, a cerium-containing compound and a molybdenum-containing compound are mixed with water to form an aqueous solution. Next, an oxycarboxylic acid is added to the aqueous solution to form a metal-oxycarboxylic acid complex. Next, glycol is added to cause an ester reaction between the oxycarboxylic acid and the glycol to form a gel.

[0033] Examples of cerium-containing compounds include cerium nitrate. Examples of molybdenum-containing compounds include ammonium molybdate. For example, cerium nitrate is cerium nitrate hexahydrate (Ce(NO3)3·6H2O), and ammonium molybdate is ammonium molybdate tetrahydrate ((NH4)6Mo7O). 24 4H2O) can be used.

[0034] Examples of the hydroxycarboxylic acid include citric acid, and examples of the glycol include ethylene glycol and propylene glycol.

[0035] The resulting gel is thoroughly dried in a drying step. The drying method is not particularly limited, but heat drying (for example, at 200°C for 12 hours) is preferred. Next, the powder obtained by drying the gel is fired (firing step). The firing conditions are not particularly limited, but firing can be performed, for example, at 550°C for 12 hours. The atmosphere in which firing is performed is not particularly limited, and firing can be performed, for example, in air. Note that, between the drying step and the firing step, a calcination step in which the powder obtained by drying the gel is calcined and a molding step in which the calcined powder is molded may be added.

[0036] <Hydrothermal synthesis method> Next, a hydrothermal synthesis method will be described as another method for producing composite oxide ceramics. Figure 2 is a flow chart showing an example of the hydrothermal synthesis method.

[0037] The hydrothermal synthesis method in this embodiment includes a step of stirring and mixing aqueous solutions containing a cerium-containing compound and a molybdenum-containing compound, and then heating them to react with each other to obtain an intermediate substance; a drying step of drying the obtained intermediate material; a calcination step of calcining the powder obtained by the drying; Equipped with. The hydrothermal synthesis method has the advantage that it is possible to obtain a composite oxide ceramic with excellent uniformity and high density at a relatively low temperature.

[0038] Specifically, a cerium-containing aqueous solution is prepared by dissolving a water-soluble cerium-containing compound in distilled water. A molybdenum-containing aqueous solution is prepared by dissolving a water-soluble molybdenum-containing compound in distilled water. These aqueous solutions are then mixed and stirred at room temperature. The mixed aqueous solution is then heated for a predetermined time (hydrothermal synthesis) to obtain an intermediate substance.

[0039] Examples of cerium-containing compounds that are soluble in water include cerium nitrate. Examples of molybdenum-containing compounds that are soluble in water include ammonium molybdate. For example, diammonium cerium nitrate (Ce(NH4)2(NO3)6) is an example of a cerium-containing compound, and ammonium molybdate tetrahydrate ((NH4)6Mo7O 24 4H2O) can be used.

[0040] The obtained intermediate substance is washed with water and ethanol, and then thoroughly dried in a drying step. The drying method is not particularly limited, but heat drying (for example, at 80°C for 6 hours) is preferred. Next, the powder obtained by drying is fired (firing step). The firing conditions are not particularly limited, but firing can be performed, for example, at 500°C for 12 hours. The atmosphere in which firing is performed is not particularly limited, and firing can be performed, for example, in air. Note that, between the drying step and the firing step, a calcination step in which the powder obtained in the drying step is calcined, and a molding step in which the calcined powder is molded may be added.

[0041] <Solid-state reaction method> Next, we will explain the solid-state reaction method, another method for producing composite oxide ceramics. When using the solid-state reaction method, first, a powder of a cerium-containing compound and a powder of a molybdenum-containing compound are mixed and calcined to obtain a calcined powder. For example, cerium oxide (CeO2) can be used as the raw cerium-containing compound, and molybdenum oxide (MoO3) can be used as the molybdenum-containing compound. The calcination conditions are not particularly limited, but calcination at 900°C or higher is preferable. Next, in the firing step, the obtained calcined powder is fired to obtain a sintered body of composite oxide ceramics. The conditions for the firing step are not particularly limited, but firing at 1000°C or higher is preferable. [Example]

[0042] The present embodiment will be specifically described below with reference to examples, but the present embodiment is not limited to these examples.

[0043] <Sample Preparation> The samples according to Examples 1 to 3 and Comparative Examples 1 and 2 were prepared using the following method.

[0044] [Example 1: CMO(III)_2:3] As a sample according to Example 1, CeMoO 12A compound represented by the following formula was prepared. The sample according to Example 1 was prepared using the citric acid polymerization method (see FIG. 1). The method for preparing the sample will be specifically described below.

[0045] First, cerium(III) nitrate hexahydrate (Ce(NO3)3·6H2O) and ammonium molybdate(VI) tetrahydrate ((NH4)6Mo7O 24 4H2O) were dissolved in distilled water. Once a homogeneous solution was obtained, the cerium(III) nitrate solution was stirred and the ammonium molybdate(VI) solution was slowly added dropwise. The cerium to molybdenum ion ratio was Ce:Mo=2:3.

[0046] Next, citric acid was dissolved in distilled water in an amount twice the amount of metal ions (Ce + Mo) in the mixed solution and added. Next, ethylene glycol was added in an amount two-thirds the amount of citric acid to induce an esterification reaction. This solution was stirred at 80°C for several hours to remove the water, resulting in a gel. The resulting gel was dried at 200°C for 12 hours, then calcined at 550°C for 12 hours and crushed to obtain a sample powder.

[0047] The obtained sample powder was analyzed using X-ray diffraction and found to be CeMoO 12 The result was a single-phase powder (see FIG. 3). Hereinafter, the sample according to Example 1 will also be referred to as CMO(III)_2:3.

[0048] Furthermore, the composition of the obtained sample powder (CMO(III)_2:3) was analyzed using an inductively coupled plasma optical emission spectrometer (ICP-OES), which revealed a Ce:Mo ratio of 2.0:3.0 (see Figure 4). Therefore, a sample with the expected composition ratio (Ce:Mo=2:3) was successfully produced. Furthermore, the valence of Ce atoms on the powder surface was examined using X-ray photoelectron spectroscopy (XPS), which revealed a Ce(III):Ce(IV) ratio of 92%:8% (see Figure 4). Note that Mo was generally hexavalent.

[0049] In addition, a scanning electron microscope (SEM) photograph of the obtained sample powder is shown in Figure 5. The specific surface area values ​​obtained by nitrogen adsorption and the BET method are also shown. For CMO(III)_2:3 in Example 1, the specific surface area value was SSA = 3.0 (m 2 / g).

[0050] [Example 2: CMO(III)_1:2] As a sample according to Example 2, CeMoO 15 A compound represented by the following formula was prepared. The sample according to Example 2 was prepared using the citric acid polymerization method (see FIG. 1). The method for preparing the sample will be specifically described below.

[0051] First, cerium(III) nitrate hexahydrate (Ce(NO3)3·6H2O) and ammonium molybdate(VI) tetrahydrate ((NH4)6Mo7O 24 4H2O) were dissolved in distilled water. Once a homogeneous solution was obtained, the cerium(III) nitrate solution was stirred and the ammonium molybdate(VI) solution was slowly added dropwise. The cerium to molybdenum ion ratio was Ce:Mo=1:2.

[0052] Next, citric acid was dissolved in distilled water in an amount twice the amount of metal ions (Ce + Mo) in the mixed solution and added. Next, ethylene glycol was added in an amount two-thirds the amount of citric acid to induce an esterification reaction. This solution was stirred at 80°C for several hours to remove the water, resulting in a gel. The resulting gel was dried at 200°C for 12 hours, then calcined at 550°C for 12 hours and crushed to obtain a sample powder.

[0053] The obtained sample powder was analyzed using X-ray diffraction and found to be Ce2Mo4O 15 The result was a single-phase powder (see FIG. 3). Hereinafter, the sample according to Example 2 will also be referred to as CMO(III)_1:2.

[0054] Furthermore, the composition of the obtained sample powder (CMO(III)_1:2) was analyzed using an inductively coupled plasma (ICP) optical emission spectroscopy (ICP-OES) and found to be Ce:Mo = 2.0:4.0 (see Figure 4). Therefore, a sample with the expected composition ratio (Ce:Mo = 2:4) was successfully produced. Furthermore, the valence of Ce atoms on the powder surface was examined using XPS and found to be Ce(III):Ce(IV) = 95%:5% (see Figure 4). Note that Mo was generally hexavalent.

[0055] FIG. 5 shows a scanning electron microscope (SEM) photograph of the obtained sample powder. The specific surface area values ​​obtained by nitrogen adsorption and the BET method are also shown. For CMO(III)_1:2 in Example 2, the specific surface area value was SSA = 2.6 (m 2 / g).

[0056] [Example 3: CMO(IV)_2:3] As a sample according to Example 3, CeMoO 13 A compound represented by the following formula was prepared. The sample according to Example 1 was prepared using a hydrothermal synthesis method (see FIG. 2). The method for preparing the sample will be specifically described below.

[0057] First, diammonium cerium nitrate (Ce(NH4)2(NO3)6) and ammonium molybdate(VI) tetrahydrate ((NH4)6Mo7O 24 4H2O) were dissolved in distilled water. Once a homogeneous solution was obtained, the ammonium molybdate (VI) solution was slowly added dropwise to the diammonium cerium nitrate solution while stirring, and the mixture was stirred for 1 hour. The resulting solution was then poured into a Teflon container. The ion ratio of cerium to molybdenum was Ce:Mo=2:3.

[0058] After that, hydrothermal synthesis was carried out at 160°C for 5 hours. The powder obtained by hydrothermal synthesis was then washed with water and ethanol and dried at 80°C for 6 hours to obtain a dry powder. The dry powder was then calcined at 500°C for 12 hours to obtain a sample powder.

[0059] The obtained sample powder was analyzed using X-ray diffraction and found to be CeMoO 13 The result was a single-phase powder (see FIG. 3). Hereinafter, the sample according to Example 3 will also be referred to as CMO(IV)_2:3.

[0060] Furthermore, the composition of the obtained sample powder (CMO(IV)_2:3) was analyzed using an inductively coupled plasma (ICP) optical emission spectroscopy (ICP-OES) and found to be Ce:Mo = 2.0:3.1 (see Figure 4). Therefore, a sample with roughly the expected composition ratio (Ce:Mo = 2:3) was successfully produced. Furthermore, the valence of Ce atoms on the powder surface was examined using XPS and found to be Ce(III):Ce(IV) = 52%:48% (see Figure 4). Note that Mo was generally hexavalent.

[0061] FIG. 5 shows a scanning electron microscope (SEM) photograph of the obtained sample powder. It also shows the specific surface area values ​​obtained by nitrogen adsorption and the BET method. For CMO(IV)_2:3 in Example 3, the specific surface area value was SSA = 14 (m 2 / g).

[0062] [Comparative example: LCMO, LMO] As a sample for comparison, La 1.8 Ce 0.2 Mo2O9 (LCMO) and La2Mo2O9 (LMO) were prepared.

[0063] To prepare LCMO, first, an aqueous solution of lanthanum nitrate hexahydrate (La(NO3)3·6H2O) and cerium nitrate hexahydrate (Ce(NO3)3·6H2O) dissolved in distilled water is mixed with ammonium molybdate tetrahydrate ((NH4)6Mo7O 24 Aqueous solutions of each compound (4H2O) were prepared by dissolving them in distilled water. These solutions were then mixed at room temperature. Next, they were kept in a constant temperature bath at 70°C for 24 hours to obtain an intermediate substance.

[0064] The intermediate material was then dried at 120°C for 24 hours to obtain a dry powder. The dry powder was then calcined at 500°C for 6 hours in an air atmosphere to obtain a composite oxide ceramic (La 1.8 Ce 0.2 The calcined powder was then sintered at 900°C for 3 hours in air to obtain a sintered body of LCMO.

[0065] To prepare LMO, first, an aqueous solution of lanthanum nitrate hexahydrate (La(NO3)3·6H2O) and ammonium molybdate tetrahydrate ((NH4)6Mo7O 24 An aqueous solution of La and Mo (4H2O) was prepared. The two aqueous solutions were mixed so that the molar ratio of La to Mo was 1:1. After heating the solution to 80°C, an aqueous citric acid solution was added so that the molar ratio of the total of La and Mo to citric acid was 1:2. Next, an ethylene glycol solution was added so that the amount of ethylene glycol was 2 / 3 equivalent to the citric acid, and the solution was kept in a constant temperature bath at 80°C with stirring for 6 hours to obtain a gel.

[0066] The gel was then dried at 200°C for 24 hours to obtain a dry powder. It was then calcined at 500°C for 12 hours in an air atmosphere to obtain a calcined powder of composite oxide ceramics (La2Mo2O9 (LMO)). The calcined powder was then fired at 900°C for 12 hours in an air atmosphere to obtain a sintered LMO body.

[0067] <Antiviral evaluation> The antiviral activity evaluation will be described with reference to Fig. 6. Fig. 6 is a flow chart showing the procedure for the antiviral activity evaluation. Fig. 6 also shows a schematic diagram showing the method for the antiviral activity evaluation.

[0068] The sample prepared by the above method was dispersed in ethanol to prepare a 1 mg / ml dispersion. 150 μL of the dispersion was applied to a 25 mm square glass substrate and then dried. This application and drying process was repeated three times, followed by sterilization, to prepare multiple test substrates. Separately, bacteriophage φ6 (a surrogate virus for influenza virus) was dissolved in 1 / 500 NB medium at 2.0 × 10 9 An inoculation solution of approximately PFU / ml was prepared and diluted 100-fold to obtain 2.0 × 10 7 A solution of approximately PFU / ml was prepared.

[0069] 50 μL (approximately 10 6 PFU) was dropped onto the sample, which was then sealed with film, wrapped in aluminum foil, and left in the dark. To count the number of phage (plaques) remaining in the sample after a specified time had passed, the virus growth was suppressed with SCDLP medium and then diluted with 0.01M PBS. Next, a solution of φ6 infected with Pseudomonas syringae (P. syringae) mixed with soft agar medium (Nankang) was added to a dish containing NA agar medium and left for a specified time, after which the number of plaques was recorded and the antiviral activity value was calculated.

[0070] The results of the antiviral test are shown in Figure 7. In Figure 7, the vertical axis represents the logarithm of the survival rate of the virus (bacteriophage φ6), and a two-digit reduction is considered to be antiviral activity. As shown in Figure 7, CMO(III)_2:3 of Example 1, CMO(III)_1:2 of Example 2, and CMO(IV)_2:3 of Example 3 exhibited better antiviral activity than the LCMO and LMO of the comparative examples. In particular, CMO(IV)_2:3 of Example 3 exhibited the best antiviral activity against bacteriophage φ6. Specifically, CMO(IV)_2:3 of Example 3 exhibited the activity of killing more than 99.99% of bacteriophage φ6 in 6 hours.

[0071] The present invention has been described above in accordance with the above-described embodiments, but the present invention is not limited to the configurations of the above-described embodiments, and naturally includes various modifications, alterations, and combinations that can be made by a person skilled in the art within the scope of the invention claimed in the claims of this application.

[0072] This application claims priority based on Japanese Patent Application No. 2020-121420, filed on July 15, 2020, the disclosure of which is incorporated herein in its entirety.

Claims

1. Ce(MoO ４ ) ２ , Ce ２ MoO ６ , Ce ６ (MoO ４ ) ８ (Mo ２ O ７ ), or Ce ８ Mo １２ O ４９ A composite oxide ceramic having antiviral activity represented by the formula: A functional material in which the composite oxide ceramic is mixed with a material different from the composite oxide ceramic and having photocatalytic and / or antibacterial properties.

2. 2. The functional material according to claim 1, wherein the virus reduction rate after 6 hours by a film adhesion method is 99% or more.

3. 3. The functional material according to claim 1, wherein the virus reduction rate after 6 hours by a film adhesion method is 99.99% or more.

4. The functional material according to any one of claims 1 to 3, wherein the composite oxide ceramic is a sintered body.

5. The functional material according to any one of claims 1 to 4, wherein the antibacterial material comprises at least one of an oxide containing La and Mo and an oxide containing La, Ce and Mo.

6. An article having the functional material according to any one of claims 1 to 5 on at least a portion of its surface.

Images