Antibacterial and antiviral material, green compact, sintered body, article, slurry composition, and coating agent

Abstract

An antibacterial and antiviral material according to the present invention comprises a Ce-Mo-based composite oxide ceramic containing β-Ce2Mo3O13.

Description

Antibacterial and antiviral materials, compacts, sintered bodies, articles, slurry compositions, and coating agents

[0001] The present invention relates to an antibacterial and antiviral material, a green compact, a sintered compact, an article, a slurry composition, and a coating agent.

[0002] Inorganic antibacterial and antiviral materials have advantages such as a wide temperature range in which they can be used and the fact that viruses and the like are unlikely to acquire resistance to them, and they have been actively researched in recent years. Examples of this type of antibacterial and antiviral material include metals such as Ag and Cu, TiO ２ Photocatalytic systems such as those based on ZnO, CaO, and other metal oxides have been reported and are in actual use.

[0003] As shown in Patent Document 1, among inorganic antibacterial and antiviral materials, composite oxide ceramics containing cerium (Ce) and molybdenum (Mo) and having high antibacterial and antiviral activity have attracted attention.

[0004] International Publication No. 2022 / 014631

[0005] Antibacterial and antiviral materials are sometimes used in the form of a slurry, for example, by dispersing a powder in water or the like. Antibacterial and antiviral materials are also sometimes used in environments where they are likely to come into contact with water, such as in a bath or a washbasin. In this way, antibacterial and antiviral materials are sometimes used in the presence of water, such as by contacting them with water or immersing them in water, for long periods of time.

[0006] For example, in order to use an antibacterial / antiviral material continuously in the presence of water, the antibacterial / antiviral material needs to have a suitable level of water resistance. However, the above-mentioned composite oxide ceramics containing cerium and molybdenum (e.g., Ce ２ Mo ３ O １３ ) the fact is that no consideration has been given to water resistance at all.

[0007] An object of the present invention is to provide an antibacterial and antiviral material, etc., made of a Ce—Mo based composite oxide ceramic having excellent water resistance.

[0008] The inventors have found that when producing Ce-Mo based composite oxide ceramics, if the content of Al (trace element) in the raw material powder is controlled to 100 ppm or less, β-type Ce can be obtained. ２ Mo ３ O １３ (β-Ce ２ Mo ３ O １３ ) is selectively (specifically, depending on the conditions) formed.

[0009] Furthermore, the present inventors have found that β-Ce ２ Mo ３ O １３ However, when the content of Al in the raw material powder is high, γ-type Ce is formed. ２ Mo ３ O １３ (γ-Ce ２ Mo ３ O １３ ) and found that it has the same antibacterial and antiviral activity as PEG-1, while being stable in water.

[0010] As a result of extensive research conducted by the present inventors to achieve the above object, as described above, β-Ce ２ Mo ３ O １３ The present inventors have found that a Ce—Mo-based composite oxide ceramic containing the above-mentioned compound has excellent water resistance while maintaining excellent antibacterial and antiviral activity, and have completed the present invention.

[0011] The means for solving the above problems are as follows: <1> β-Ce ２ Mo ３ O １３ An antibacterial and antiviral material comprising a Ce-Mo based composite oxide ceramic containing

[0012] <2> The β-Ce in the crystal of the Ce—Mo-based composite oxide ceramic ２ Mo ３ O １３ The antibacterial and antiviral material according to <1>, wherein the proportion of the crystalline phase is 32% or more.

[0013] <3> The antibacterial and antiviral material according to <1> or <2>, wherein the Ce—Mo-based composite oxide ceramic has an Al content of 100 ppm or less.

[0014] <4> The Ce—Mo-based composite oxide ceramic according to any one of <1> to <3>, wherein the Ce—Mo-based composite oxide ceramic is in powder form, and the powdered Ce—Mo-based composite oxide ceramic is compression-molded to form a green compact.

[0015] <5> A sintered body obtained by sintering the Ce—Mo-based composite oxide ceramic according to any one of <1> to <3>.

[0016] <6> An article having the antibacterial and antiviral material according to any one of <1> to <3> on at least a part of its surface.

[0017] <7> An article comprising the antibacterial and antiviral material according to any one of <1> to <3> dispersed in a substrate.

[0018] <8> A slurry composition containing the antibacterial and antiviral material according to any one of <1> to <3> and a dispersion medium.

[0019] <9> A coating agent comprising the slurry composition according to <8>.

[0020] According to the present invention, it is possible to provide an antibacterial and antiviral material made of a Ce—Mo based composite oxide ceramic having excellent water resistance.

[0021] Figure showing X-ray diffraction spectra from each sample of Examples 1, 2, 3, 4 and Comparative Example 1. Figure showing the XRD measurement results (X-ray diffraction spectrum) after immersion in pure water in Example 1. Figure showing the XRD measurement results (X-ray diffraction spectrum) after immersion in pure water in Comparative Example 1. Figure showing the XRD measurement results (X-ray diffraction spectrum) after immersion in pure water in Example 2. Figure showing the XRD measurement results (X-ray diffraction spectrum) after immersion in pure water in Example 3. Figure showing the XRD measurement results (X-ray diffraction spectrum) after immersion in pure water in Example 4.

[0022] The antibacterial and antiviral material of this embodiment is β-Ce ２ Mo ３ O １３The ceramic material is a Ce-Mo based composite oxide ceramic containing

[0023] The Ce-Mo composite oxide ceramic is a composite oxide ceramic containing cerium (Ce) and molybdenum (Mo), and has a β-type crystalline structure as an essential component. ２ Mo ３ O １３ (β-Ce ２ Mo ３ O １３ ) is included.

[0024] Ce-Mo based composite oxide ceramics include β-Ce ２ Mo ３ O １３ It is preferable that the Ce-Mo based composite oxide ceramics consist of only Ce, which has a γ-type crystal structure, as long as it does not impair the object of the present invention. ２ Mo ３ O １３ (γ-Ce ２ Mo ３ O １３ ) may also be included.

[0025] β-Ce in the crystals of Ce-Mo composite oxide ceramics ２ Mo ３ O １３ The proportion of the crystalline phase is not particularly limited as long as it does not impair the object of the present invention, but it is preferably, for example, 32% or more.

[0026] For example, in the crystals of Ce-Mo based composite oxide ceramics, β-Ce ２ Mo ３ O １３ and γ-Ce ２ Mo ３ O １３ When the crystal phase of β-Ce is included, ２ Mo ３ O １３ As described above, the proportion of the crystalline phase is preferably 32% or more. The method for determining the proportion of the crystalline phase will be described later.

[0027] The amount of oxygen atoms (O) contained in the Ce—Mo-based composite oxide ceramics may be stoichiometric or may deviate from the stoichiometric composition, so long as the object of the present invention is not impaired. In other words, the Ce—Mo-based composite oxide ceramics may be a non-stoichiometric compound, so long as the object of the present invention is not impaired.

[0028] The Ce-Mo based composite oxide ceramics may contain Ce as long as it does not impair the object of the present invention. ２ Mo ３ O １３ Besides, for example, Ce(MoO ４ ) ２ , Ce ２ MoO ６ , Ce ２ (MoO ４ ) ３ , Ce ２ Mo ４ O １５ , Ce ６ (MoO ４ ) ８ (Mo ２ O ７ ), Ce ８ Mo １２ O ４９ etc. may be included.

[0029] The Ce-Mo-based composite oxide ceramics preferably have an Al content of 100 ppm or less. The Al contained in the Ce-Mo-based composite oxide ceramics may be present anywhere in the Ce-Mo-based composite oxide ceramics as long as it does not impair the object of the present invention, but it is preferably present, for example, in the crystalline phase of the Ce-Mo-based composite oxide ceramics.

[0030] The Al content (ppm) in the Ce—Mo based composite oxide ceramics can be determined, for example, using an ICP emission spectrometer (ICP).

[0031] Furthermore, the Ce—Mo based composite oxide ceramics may contain, in addition to Al, Zr, Si, H, F, Ba, Zn, Mg, Fe, Y, and the like as inevitable impurities, as long as the object of the present invention is not impaired.

[0032] The Ce—Mo based composite oxide ceramics may be crystalline, either single crystal or polycrystalline, and the crystalline phase may be a single phase or a combination of two or more different phases.

[0033] The method for producing the Ce—Mo-based composite oxide ceramics is not particularly limited as long as it does not impair the object of the present invention, and examples thereof include a solid-state reaction method, which is preferred as a method for producing the Ce—Mo-based composite oxide ceramics from the viewpoint of ease of adjusting the Al content to a predetermined amount.

[0034] Here, a method for producing Ce—Mo-based composite oxide ceramics by a solid-state reaction method will be exemplified, which includes, for example, a compounding step, a drying step, and a pre-firing step.

[0035] The blending step is a step of mixing a predetermined amount of a cerium compound and a predetermined amount of a molybdenum compound to obtain a mixture thereof.

[0036] The cerium compound is a compound containing cerium (Ce) necessary for producing Ce-Mo based composite oxide ceramics, and examples thereof include CeO ２ cerium compounds include cerium nitrate, cerium chloride, cerium sulfate, cerium hydroxide, cerium carbonate, and cerium acetate. ２ At least one selected from the group consisting of cerium nitrate, cerium chloride, cerium sulfate, cerium hydroxide, cerium carbonate, and cerium acetate may be used. ２ is preferred.

[0037] The molybdenum compound is a compound containing molybdenum (Mo) necessary for producing Ce-Mo based composite oxide ceramics, and is, for example, MoO ３ , MoO ２ , MoO, Mo(OH) ３ , Mo(OH) ５ Examples of molybdenum compounds include MoO ３ , MoO ２ , MoO, Mo(OH) ３ , Mo(OH) ５In addition, as the molybdenum compound, at least one selected from the group consisting of MoO ３ is preferred.

[0038] The mixing ratio of the cerium compound and the molybdenum compound is not particularly limited as long as it does not impair the object of the present invention. ２ Mo ３ O １３ It is preferable to adjust the molar ratio to Ce:Mo=2:3 for reasons such as making it easier to reliably form the above.

[0039] In the compounding step, an aluminum compound may be used as long as the content of Al contained in the Ce-Mo based composite oxide ceramic is 100 ppm or less. In the present embodiment, it is preferable that no aluminum compound is used in the compounding step. Examples of aluminum compounds include Al(NO ３ ) ３ , Al ２ O ３ , aluminum sulfate, aluminum chloride, etc.

[0040] Furthermore, when Zr is contained in the Ce—Mo-based composite oxide ceramics, a zirconium compound may be used in the compounding step, provided that the object of the present invention is not impaired. Examples of the zirconium compound include zirconium chloride, zirconium hydroxide, zirconium carbonate, zirconium sulfate, and zirconium acetate.

[0041] Furthermore, when the Ce—Mo-based composite oxide ceramics contain Si, a silicon compound such as silicon dioxide, silicon monoxide, silicon carbide, or silicon nitride may be used in the compounding step, provided that the object of the present invention is not impaired.

[0042] The blending step is carried out, for example, by placing a predetermined amount of a cerium compound and a predetermined amount of a molybdenum compound in a resin container (resin pot), then adding a predetermined amount of a solvent such as a lower alcohol (ethanol) to the container, and mixing them for a predetermined time (e.g., 5 to 30 hours) using balls (e.g., zirconia balls). This blending step produces a wet mixture in a slurry state. Note that alumina balls are not used during mixing to prevent aluminum from being mixed in.

[0043] The drying step is a step of drying the wet mixture in a slurry state obtained after the blending step. The method for drying the wet mixture is not particularly limited as long as it does not impair the object of the present invention, and examples thereof include water bath drying, a drying method using a vibration dryer, and a drying method using a spray dryer.

[0044] After the drying step, the wet mixture is dried to a powder state, and the resulting powder mixture (mixed powder) is a mixture of a solid-phase cerium compound and a solid-phase molybdenum compound.

[0045] The calcination step is a step of calcining the mixed powder obtained after the drying step in a solid state. For example, the calcination step involves calcining the mixed powder at a temperature of 400°C or higher and 650°C or lower for 1 hour to 24 hours. The calcination step does not need to be performed in a special synthetic air atmosphere, but is performed in a normal air atmosphere. Note that the calcination step is not intended to sinter the cerium compound, molybdenum compound, etc. in the mixed powder.

[0046] The calcination step yields a calcined powder (an example of a Ce—Mo based composite oxide ceramic) made of a reaction product of a cerium compound and a molybdenum compound.

[0047] The calcined powder may be granulated by spray drying or the like, if necessary, to prepare granules, and such granules may be used as the Ce—Mo-based composite oxide ceramics.

[0048] Alternatively, the calcined powder may be calcined and sintered to produce a sintered body, which can be used as a Ce—Mo-based composite oxide ceramic. For example, the calcined powder may be compression-molded into a predetermined shape (e.g., cylindrical, discoid, etc.) using a predetermined press, and the resulting compact (pressed powder) may be calcined and sintered under predetermined temperature conditions (e.g., 400° C. or higher and 650° C. or lower) for 1 hour to 24 hours to produce a sintered body that can be used as a Ce—Mo-based composite oxide ceramic.

[0049] The firing step is a firing step for sintering the Ce—Mo based composite oxide ceramics in the pre-fired powder, and can be carried out in an air atmosphere.

[0050] Furthermore, the Ce—Mo-based composite oxide ceramic of this embodiment may be produced as appropriate by applying, for example, the citric acid polymerization method or hydrothermal synthesis method described in WO 2022 / 014631.

[0051] The Ce-Mo-based composite oxide ceramic of this embodiment exhibits antibacterial properties (antibacterial activity) and antiviral properties (antiviral activity) before sintering. Furthermore, the Ce-Mo-based composite oxide ceramic of this embodiment exhibits the same antibacterial and antiviral properties after sintering as before sintering. Such a Ce-Mo-based composite oxide ceramic can be used as an antibacterial / antiviral material that has both antibacterial and antiviral properties.

[0052] The antibacterial and antiviral properties of Ce—Mo-based composite oxide ceramics can be evaluated, for example, by a film adhesion method in accordance with JIS R 1756. For example, the virus reduction rate of Ce—Mo-based composite oxide ceramics after 24 hours using the film adhesion method is 99% or more.

[0053] The shape of the Ce-Mo-based composite oxide ceramics is not particularly limited as long as it does not impair the object of the present invention, and can be any shape desired depending on the application. For example, the Ce-Mo-based composite oxide ceramics may be in the form of a powder, or may be in the form of granules obtained by granulating the powder by spray drying or the like. The Ce-Mo-based composite oxide ceramics may also be used in the form of a green compact obtained by compression molding a powdered ceramic material. The Ce-Mo-based composite oxide ceramics may also be used in the form of a sintered compact.

[0054] The Ce—Mo-based composite oxide ceramics may be used in a form in which they are applied to at least a portion of the surface of an article. The material constituting the article to which the Ce—Mo-based composite oxide ceramics is applied is not particularly limited as long as it does not impair the object of the present invention, and examples thereof include glass, ceramics, synthetic resins such as thermoplastic resins and thermosetting resins, rubber (natural rubber and synthetic rubber), genuine leather (natural leather), synthetic leather, metallic materials made of metals or alloys, wood, paper, fibers, nonwoven fabrics, silicon (silicon wafers, etc.), carbon materials, minerals, and gypsum.

[0055] The Ce—Mo-based composite oxide ceramics may be used in a form dispersed in a predetermined substrate. The substrate in which the Ce—Mo-based composite oxide ceramics is dispersed is not particularly limited as long as it does not impair the object of the present invention, and examples thereof include glass, ceramics, synthetic resins such as thermoplastic resins and thermosetting resins, rubber (natural rubber, synthetic rubber), genuine leather (natural leather), synthetic leather, metallic materials made of metals or alloys, wood, paper, fibers, nonwoven fabrics, silicon (silicon wafers, etc.), carbon materials, minerals, and gypsum.

[0056] The antibacterial and antiviral material made of Ce—Mo-based composite oxide ceramics may be dispersed in a dispersion medium such as water, alcohol (ethanol, isopropyl alcohol, etc.), or an organic solvent to be used in the form of a slurry composition, or may be used in the form of a coating agent containing such a slurry composition.

[0057] The present invention will be further described below with reference to examples, although the present invention is not limited to these examples in any way.

[0058] Example 1: CeO as a cerium compound ２ was prepared, and MoO was used as a molybdenum compound. ３ were prepared. Then, raw material powders of a cerium compound and a molybdenum compound were weighed out so that the molar ratio was 2:3 (Ce:Mo=2:3). Each weighed raw material powder was mixed with a predetermined amount of ethanol for a predetermined time, and the resulting wet mixture was dried to obtain a mixed powder. Next, the mixed powder was fired in an air atmosphere at a temperature of 475°C for 1 hour to obtain a fired powder consisting of a reaction product of the cerium compound and the molybdenum compound. In this way, the particulate (powdered) Ce-Mo-based composite oxide ceramic of Example 1 was obtained.

[0059] Example 2: CeO as a cerium compound ２ was prepared, and MoO was used as a molybdenum compound. ３ Further, as an aluminum compound, Al(NO ３ ) ３ were prepared. A raw material powder of a cerium compound and a raw material powder of a molybdenum compound were weighed out so that the molar ratio was 2:3 (Ce:Mo=2:3), and a raw material powder of an aluminum compound was weighed out so that the aluminum (Al) content was 50 ppm. The weighed raw material powders were mixed with a predetermined amount of ethanol for a predetermined time, and the resulting wet mixture was dried to obtain a mixed powder. Thereafter, the same procedure as in Example 1 was followed to produce a particulate (powdered) Ce-Mo-based composite oxide ceramic of Example 2.

[0060] [Example 3] CeO as a cerium compound ２ was prepared, and MoO was used as a molybdenum compound. ３ Further, as an aluminum compound, Al(NO ３ ) ３were prepared. A raw material powder of a cerium compound and a raw material powder of a molybdenum compound were weighed out so that the molar ratio was 2:3 (Ce:Mo=2:3), and a raw material powder of an aluminum compound was weighed out so that the aluminum (Al) content was 100 ppm. The weighed raw material powders were mixed with a predetermined amount of ethanol for a predetermined time, and the resulting wet mixture was dried to obtain a mixed powder. Thereafter, the same procedure as in Example 1 was followed to produce a particulate (powdered) Ce-Mo-based composite oxide ceramic of Example 3.

[0061] Example 4: CeO as a cerium compound ２ was prepared, and MoO was used as a molybdenum compound. ３ Further, as an aluminum compound, Al(NO ３ ) ３ were prepared. A raw material powder of a cerium compound and a raw material powder of a molybdenum compound were weighed out so that the molar ratio was 2:3 (Ce:Mo=2:3), and a raw material powder of an aluminum compound was weighed out so that the aluminum (Al) content was 150 ppm. The weighed raw material powders were mixed with a predetermined amount of ethanol for a predetermined time, and the resulting wet mixture was dried to obtain a mixed powder. Thereafter, the same procedure as in Example 1 was followed to produce a particulate (powdered) Ce-Mo-based composite oxide ceramic of Example 4.

[0062] β-Ce of each sample of Examples 1, 2, 3, 4 and Comparative Example 1 ２ Mo ３ O １３ The Al content is shown in Table 1.

[0063] Comparative Example 1 A particulate (powdered) Ce—Mo-based composite oxide ceramic of Comparative Example 1 was produced in the same manner as in Example 2, except that the raw material powder of the aluminum compound was weighed so that the aluminum (Al) content was 200 ppm.

[0064] [Measurement and Evaluation] (Identification of Crystal Structure) The crystal structure of each sample of Examples 1, 2, 3, and 4 and Comparative Example 1 was identified using powder X-ray diffraction (XRD). The measurement conditions were as follows:

[0065] <Measurement conditions> Measurement equipment: Powder X-ray diffractometer (equipment name "Smart lab", manufactured by Rigaku Corporation) Detector: D / teX Ultra250. Optical system: Concentrated optical system Bragg-Brentano type X-ray output: 40 kV-30 mA Step width: 0.0100° Scan axis: 2θ / θ Scan range: 10.00° to 80.00°

[0066] The results of the XRD measurements (X-ray diffraction spectra) are shown in Figure 1. Figure 1 shows the X-ray diffraction spectra derived from the samples of Examples 1, 2, 3, and 4 and Comparative Example 1. Note that each diffraction spectrum was normalized to remove unnecessary background, etc.

[0067] As shown in FIG. 1, in the sample of Example 1, the crystals of the Ce—Mo based composite oxide ceramics were β-Ce ２ Mo ３ O １３ It is composed of only the crystalline phase (β type 100%), and is substantially γ-Ce ２ Mo ３ O １３ It was confirmed that the crystalline phase was not included.

[0068] In the sample of Example 3, as shown in FIG. 1, 32% of the crystals of the Ce—Mo based composite oxide ceramics were β-Ce. ２ Mo ３ O １３ The remaining (i.e., 68%) is γ-Ce ２ Mo ３ O １３ Similarly, it was confirmed that the sample of Example 2 was composed of 65% β-type and 35% γ-type, and the sample of Example 4 was composed of 20% β-type and 80% γ-type. ２ Mo ３ O １３ The proportion of the crystalline phase is β-Ce ２Mo ３ O １３ and the diffraction peaks due to γ-Ce ２ Mo ３ O １３ The intensity ratio was calculated from the diffraction peaks derived from the

[0069] In the sample of Comparative Example 1, the crystals of the Ce-Mo based composite oxide ceramics were γ-Ce ２ Mo ３ O １３ It is composed only of the crystalline phase of β-Ce ２ Mo ３ O １３ It was confirmed that the crystalline phase was not included.

[0070] (Al Content) For each of the samples of Examples 1, 2, 3, and 4 and Comparative Example 1, trace elements such as Al were detected by ICP atomic emission spectroscopy under the conditions shown below. The Al content (ppm) was then calculated in terms of oxide.

[0071] <Measurement conditions> Measurement device: ICP-AES (inductively coupled plasma atomic emission spectrometer (model "iCAP-6500", manufactured by Thermo Fisher Scientific)) Sample pretreatment: Nitric acid (with hydrochloric acid) thermal decomposition treatment

[0072] As a result of ICP atomic emission spectroscopy, the Al content in the sample of Example 1 was below the lower limit of measurement, the Al content in the sample of Example 3 was 77 ppm, and the Al content in the sample of Comparative Example 1 was 193 ppm.

[0073] (Evaluation of Water Resistance) Each of the samples of Examples 1, 2, 3, and 4 and Comparative Example 1 was immersed in pure water for 10 days. After immersion for 10 days, the sample was removed from the pure water, and the crystal structure of the sample was identified using XRD in the same manner as for the unimmersed (before immersion) sample described above.

[0074] The XRD measurement results of Example 1 after immersion are shown in Figure 2. For comparison, Figure 2 also shows the XRD measurement results of Example 1 without immersion. Each diffraction spectrum in Figure 2 has been normalized to remove unnecessary background. As shown in Figure 2, in the case of the sample of Example 1, even after immersion in pure water for 10 days, no change in the diffraction spectrum was observed compared to before immersion (without immersion), and it was confirmed that the β-type crystal structure was maintained. In other words, the crystal structure of the sample of Example 1 (β-Ce ２ Mo ３ O １３ ) was stable against water, and it was confirmed that the sample of Example 1 had excellent water resistance.

[0075] The XRD measurement results of Comparative Example 1 after immersion are shown in Figure 3. For comparison, Figure 3 also shows the XRD measurement results of Comparative Example 1 without immersion. Each diffraction spectrum in Figure 3 has been normalized to remove unnecessary background. As shown in Figure 3, the sample of Comparative Example 1 had a γ-type crystal structure (diffraction spectrum) before immersion (without immersion), but after immersion in pure water for 10 days, a change was observed in the diffraction spectrum. In other words, the crystal structure of the sample of Comparative Example 1 (γ-Ce ２ Mo ３ O １３ ) is unstable to water, and the sample of Comparative Example 1 was confirmed to have poor water resistance.

[0076] The XRD measurement results of Example 2 after immersion are shown in Figure 4. For comparison, Figure 4 also shows the XRD measurement results of Example 2 without immersion. Each diffraction spectrum in Figure 4 has been normalized to remove unnecessary background. As shown in Figure 4, in the case of the sample of Example 2, even after immersion in pure water for 10 days, no change in the diffraction spectrum was observed compared to before immersion (without immersion), and it was confirmed that the β-type crystal structure was maintained. In other words, the crystal structure of the sample of Example 2 (β-Ce ２ Mo ３ O １３ ) was stable against water, and it was confirmed that the sample of Example 2 had excellent water resistance.

[0077] The XRD measurement results of Example 3 after immersion are shown in Figure 5. For comparison, Figure 5 also shows the XRD measurement results of Example 3 without immersion. Each diffraction spectrum in Figure 5 has been normalized to remove unnecessary background. As shown in Figure 5, in the case of the sample of Example 3, even after immersion in pure water for 10 days, no change in the diffraction spectrum was observed compared to before immersion (without immersion), and it was confirmed that the β-type crystal structure was maintained. In other words, the crystal structure of the sample of Example 3 (β-Ce ２ Mo ３ O １３ ) was stable against water, and it was confirmed that the sample of Example 3 had excellent water resistance.

[0078] The XRD measurement results of Example 4 after immersion are shown in Figure 6. For comparison, Figure 6 also shows the XRD measurement results of Example 4 without immersion. Each diffraction spectrum in Figure 6 has been normalized to remove unnecessary background. As shown in Figure 6, in the case of the sample of Example 4, even after immersion in pure water for 10 days, no change in the diffraction spectrum was observed compared to before immersion (without immersion), and it was confirmed that the β-type crystal structure was maintained. In other words, the crystal structure of the sample of Example 4 (β-Ce ２ Mo ３ O １３ ) was stable against water, and it was confirmed that the sample of Example 4 had excellent water resistance.

[0079] [Evaluation of Antiviral Activity] The antiviral performance was evaluated by the film adhesion method for each sample of Example 1 and Comparative Example 1. As a result, it was confirmed that the β-type sample of Example 1 had antiviral performance equivalent to that of the γ-type sample of Comparative Example 1.

Claims

1. β-Ce ２ M.O. ３ O １３ The present invention relates to an antibacterial and antiviral material comprising a Ce-Mo based composite oxide ceramic containing:

2. The β-Ce in the crystal of the Ce-Mo based composite oxide ceramic ２ M.O. ３ O １３ 2. The antibacterial and antiviral material according to claim 1, wherein the proportion of the crystalline phase is 32% or more.

3. The antibacterial and antiviral material according to claim 1 or 2, wherein the content of Al contained in the Ce-Mo based composite oxide ceramic is 100 ppm or less.

4. The Ce-Mo based composite oxide ceramics according to claim 1 or 2, which is in powder form, is compressed into a green compact obtained by molding the powdered Ce-Mo based composite oxide ceramics.

5. A sintered body obtained by sintering the Ce-Mo based composite oxide ceramics according to claim 1 or 2.

6. An article having the antibacterial and antiviral material according to claim 1 or 2 on at least a portion of its surface.

7. An article comprising a substrate having the antibacterial and antiviral material according to claim 1 or 2 dispersed therein.

8. A slurry composition comprising the antibacterial and antiviral material according to claim 1 or 2 and a dispersion medium.

9. A coating agent comprising the slurry composition of claim 8.

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