Thermal response tri-state intelligent window and preparation method thereof

Abstract

The invention discloses a thermal response tri-state intelligent window and a preparation method thereof, and relates to the technical field of intelligent windows, the thermal response tri-state intelligent window comprises a first substrate layer, a first phase change layer, an anti-reflection layer, an air layer, a second phase change layer and a second substrate layer from outside to inside in sequence; the thermal response three-state intelligent window comprises three states, in the cold state, the first phase change layer and the second phase change layer do not have phase change, and visible light and near infrared wavelength penetrate through the thermal response three-state intelligent window at the initial light transmittance; in a warm state, the first phase change layer is subjected to phase change, visible light penetrates through the thermal response three-state intelligent window at the initial light transmittance, and the light transmittance of the near-infrared wavelength is reduced; in a hot state, the first phase change layer and the second phase change layer are subjected to phase change, and the light transmittance of visible light and the light transmittance of near-infrared wavelength are reduced. According to the embodiment of the invention, the light transmission performance is adjusted in a stepped manner according to the change of the external temperature, so that the indoor temperature is adjusted, and the building energy consumption and the production cost are reduced.

Description

Technical Field

[0001] The present application belongs to the field of smart window technology, and in particular, relates to a thermally responsive three-state smart window and a preparation method thereof. Background Art

[0002] Windows in daily buildings provide normal lighting for the indoor environment and are a channel for energy exchange with the outside world, but they also become a weak link in building energy conservation and insulation. Traditional windows usually have a high transmittance in the entire solar spectrum band. Although they can meet people's needs for light brightness, the solar radiation transmitted through the windows often causes significant changes in indoor temperature. In order to maintain a comfortable indoor temperature, air conditioners or heaters are needed to adjust the temperature, which greatly increases the energy consumption of the building.

[0003] In recent years, smart windows that can dynamically adjust spectral transmittance according to environmental stimuli have received extensive attention and developed rapidly. Based on different response mechanisms, including electrical, thermal, mechanical and optical modes, various types of smart windows have been explored. However, photochromic materials are often unstable, while electrochromic and mechanical windows usually require complex equipment settings and additional energy input, which limits their practical applications. In contrast, thermochromic smart windows have become a hot research topic due to their passive response to ambient temperature changes and the lack of external energy. The ideal smart window should be able to adjust the entire solar spectrum band (380-2500nm), effectively respond to changes in ambient temperature, and achieve energy conservation and emission reduction. At present, most thermochromic smart windows are limited to the modulation of a single visible light band, simply and crudely shielding the thermal radiation of the near-infrared band, or using materials with the same phase change temperature to achieve only two-state regulation, which cannot achieve comprehensive step-by-step regulation and adaptive optimization of the entire solar spectrum band. Thermochromic smart windows with dual-band three-state regulation can improve the energy saving effect of buildings by independently controlling the transmittance of the near-infrared band and visible light. Summary of the invention

[0004] The purpose of this application is to provide a thermally responsive three-state smart window and a preparation method thereof, which can reversibly convert between different states (cold, warm, and hot) according to changes in the external temperature, automatically adjust its light transmittance, and thus achieve indoor temperature regulation.

[0005] In order to achieve the above objectives, the solution proposed in this application is:

[0006] In a first aspect, an embodiment of the present application provides a thermally responsive three-state smart window, which includes, from the outside to the inside, a first substrate layer, a first phase change layer, an anti-reflection layer, an air layer, a second phase change layer, and a second substrate layer;

[0007] The first phase change layer is attached to the first base layer, the anti-reflection layer is attached to the first phase change layer, the anti-reflection layer and the second phase change layer are separated by an air layer, and the second phase change layer is attached to the second base layer;

[0008] The thermally responsive three-state smart window includes a cold state, a warm state, and a hot state, where:

[0009] In the cold state, neither the first phase change layer nor the second phase change layer undergoes phase change, and visible light and near-infrared wavelengths pass through the thermally responsive three-state smart window at the initial transmittance;

[0010] In the warm state, the first phase change layer undergoes a phase change, visible light passes through the thermal responsive three-state smart window at the initial transmittance, and the transmittance of near-infrared wavelengths decreases;

[0011] Under hot conditions, both the first phase change layer and the second phase change layer undergo phase change, and the transmittance of visible light and the transmittance of near-infrared wavelengths are reduced.

[0012] According to the above method of the embodiment of the present application, the following additional technical features may also be provided:

[0013] Furthermore, the material of the first substrate layer is aluminum oxide, and the thickness of the first substrate layer is .

[0014] Furthermore, the material of the first phase change layer is , the thickness of the first phase change layer is .

[0015] Furthermore, the material of the anti-reflection layer is an aluminum oxide film, and the thickness of the anti-reflection layer is .

[0016] Furthermore, the thickness of the air layer is .

[0017] Furthermore, the material of the second phase change layer is , the thickness of the second phase change layer is .

[0018] Furthermore, the material of the second substrate layer is ordinary glass, and the thickness of the second substrate layer is .

[0019] In a second aspect, an embodiment of the present application provides a method for preparing a thermally responsive three-state smart window, comprising:

[0020] The first substrate layer is used as a starting layer of the thermally responsive three-state smart window;

[0021] Deposition on the first substrate layer by RF magnetron sputtering Doping Metal film, forming Alloy film, The alloy film was oxidized by wet oxidation in a tube furnace. A thin film, forming a first phase change layer;

[0022] exist The surface deposition thickness of the film is Aluminum oxide film to form an anti-reflection layer;

[0023] The perovskite film is manufactured by spin coating to form the second phase change layer;

[0024] The first substrate layer and the second substrate layer are sealed to obtain a thermally responsive three-state smart window.

[0025] Further, by radio frequency magnetron sputtering, the first substrate layer is deposited Doping Metal film, forming Alloy film, The alloy film was oxidized by wet oxidation in a tube furnace. The film, forming a first phase change layer, comprises:

[0026] The metal Target and metal The RF sputtering powers of the targets were set to 25 W and 150 W, respectively, the working pressure was 1.0 Pa, and the argon gas flow rate was 80 SCCM.

[0027] Furthermore, a perovskite film is manufactured by a spin coating method to form a second phase change layer, including:

[0028] The perovskite precursor was dropped onto the surface of the second substrate layer, and the layer was placed in a spin coater, with high-speed rotation at 500 rpm for 10 s and 3000 rpm for 35 s, and the layer was placed on a hot plate at 100° C. and dried for 30 minutes to obtain a perovskite film.

[0029] Compared with the prior art, the thermally responsive three-state smart window provided by the embodiment of the present application has the following beneficial technical effects:

[0030] The thermally responsive three-state smart window of the embodiment of the present application can reversibly switch between different states (cold, warm, hot) according to the change of the external temperature, and realize automatic adjustment of the light transmission performance. In the cold state, visible light and near-infrared wavelengths pass through with the initial light transmittance to ensure sufficient light in the room; when the external temperature rises and enters the warm state, the first phase change layer undergoes a phase change, reducing the light transmittance of the near-infrared wavelength, effectively reducing the entry of heat, and maintaining a suitable indoor temperature; in the extremely hot state of high temperature, both the first phase change layer and the second phase change layer undergo a phase change, further reducing the light transmittance of visible light, effectively isolating the external heat, and maintaining the indoor coolness.

[0031] The thermally responsive three-state smart window of the embodiment of the present application provides suitable indoor temperature and light conditions in different seasons and weather conditions by automatically adjusting the light transmittance, which not only reduces the use of air conditioning and lighting systems and reduces energy consumption, but also improves the comfort and quality of life of the occupants.

[0032] The automatic adjustment function of the thermally responsive three-state smart window of the embodiment of the present application helps to reduce energy consumption and greenhouse gas emissions, which is in line with the concepts of environmental protection and sustainable development. The environmentally friendly sealing manufacturing process adopted also reflects respect and protection for the environment.

[0033] The preparation method of the embodiment of the present application adopts technologies such as radio frequency magnetron sputtering and wet oxidation, and the process is simple and controllable. By accurately controlling parameters such as sputtering power, working pressure and argon gas flow rate, a high-quality first phase change layer can be prepared. At the same time, the method of preparing perovskite film by spin coating also simplifies the preparation process of the second phase change layer and improves production efficiency. Compared with traditional smart windows, the preparation method of thermal response three-state smart window adopts materials such as aluminum oxide, And perovskite are common materials, and the preparation process does not require complicated equipment and processes, which reduces production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 The overall structural schematic diagram of the thermally responsive three-state smart window of an embodiment of the present application is shown.

[0035] Figure 2 The temperature-resistance curves of tungsten-doped vanadium dioxide films with different thicknesses according to an embodiment of the present application are shown.

[0036] Figure 3 The spectra of tungsten-doped vanadium dioxide with different thicknesses before and after phase change in the embodiments of the present application are shown.

[0037] Figure 4 The thickness of the embodiment of the present application is shown as 1 Spectra of perovskite films at low and high temperatures.

[0038] Figure 5 The three-state spectrum diagram of the thermally responsive three-state smart window of Example 1 of the present application is shown.

[0039] Figure 6 The three-state spectrum diagram of the thermally responsive three-state smart window of Example 2 of the present application is shown.

[0040] Figure 7 The three-state spectrum diagram of the thermally responsive three-state smart window of Example 3 of the present application is shown.

[0041] Explanation of the reference numerals: 1. first base layer; 2. first phase change layer; 3. anti-reflection layer; 4. air layer; 5. second phase change layer; 6. second base layer. DETAILED DESCRIPTION

[0042] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. It is to be understood that the specific embodiments described herein are only used to explain the present application, rather than to limit the present application. It should also be noted that, for ease of description, only some structures related to the present application are shown in the accompanying drawings, rather than all structures. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0043] The terms "including" and "having" and any variations thereof in this application are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device comprising a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products or devices.

[0044] Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0045] like Figure 1 As shown, the embodiment of the present application provides a thermally responsive three-state smart window, which includes, from the outside to the inside, a first substrate layer 1, a first phase change layer 2, an anti-reflection layer 3, an air layer 4, a second phase change layer 5, and a second substrate layer 6;

[0046] The first phase change layer 2 is attached to the first base layer 1, the anti-reflection layer 3 is attached to the first phase change layer 2, the anti-reflection layer 3 and the second phase change layer 5 are separated by an air layer 4, and the second phase change layer 5 is attached to the second base layer 6;

[0047] Among them, the first substrate layer 1 is the outermost layer of the thermally responsive three-state smart window, which plays a role of protection and support; the first phase change layer 2 is one of the key parts of the thermally responsive three-state smart window, which can undergo phase change with changes in temperature, thereby changing its transmittance to near-infrared light; the anti-reflection layer 3 is located under the first phase change layer 2, which is used to reduce light reflection and improve light transmission efficiency; the air layer 4 is used as a spacer layer to separate the anti-reflection layer 3 and the second phase change layer 5, and can further improve the thermal insulation performance; the second phase change layer 5 is similar to the first phase change layer 2, and is also a material layer that can undergo phase change, which further adjusts the visible light transmittance of the smart window; the second substrate layer 6 is the innermost layer of the thermally responsive three-state smart window, which is usually connected to the window frame or wall of the building.

[0048] The thermally responsive three-state smart window includes a cold state, a warm state, and a hot state, where:

[0049] In the cold state, neither the first phase change layer 2 nor the second phase change layer 5 undergoes phase change, and visible light and near-infrared wavelengths pass through the thermal responsive three-state smart window at the initial transmittance, allowing light to enter the room freely;

[0050] In the warm state, the first phase change layer 2 undergoes a phase change, and visible light passes through the thermal responsive three-state smart window at the initial transmittance, while the transmittance of near-infrared wavelengths decreases. The room can still get enough natural light illumination, but part of the heat from the sun is effectively blocked outdoors.

[0051] In a hot state, the first phase change layer 2 and the second phase change layer 5 both undergo phase change, and the transmittance of visible light and the transmittance of near-infrared wavelengths are reduced, that is, most of the heat from the sun is blocked.

[0052] In this embodiment, the material of the first substrate layer 1 is aluminum oxide, and the thickness of the first substrate layer 1 is ; Alumina is a material with high hardness, high wear resistance, high corrosion resistance and high thermal stability. As the first substrate layer 1 of the thermally responsive three-state smart window, it can effectively protect the internal phase change layer and anti-reflection layer 3 while providing sufficient structural strength. 430 The thickness ensures sufficient mechanical strength while avoiding the increase in weight and cost caused by excessive thickness.

[0053] The material of the first phase change layer 2 is , the thickness of the first phase change layer 2 is ; (Tungsten-doped vanadium dioxide) is a material with excellent thermoinduced phase change properties. At low temperatures, it is in a semiconductor state, allowing light to pass through; at high temperatures, it changes to a metallic state, significantly reducing the transmittance of light (especially near-infrared light). This phase change property enables the thermally responsive three-state smart window to automatically adjust its transmittance according to the external temperature, thereby achieving energy saving. The thickness range not only ensures the performance of the phase change material, but also avoids the cost increase and preparation difficulty caused by excessive thickness.

[0054] The material of the anti-reflection layer 3 is aluminum oxide film, and the thickness of the anti-reflection layer 3 is The main function of the anti-reflection layer 3 is to reduce the reflection of light on the surface of the thermal responsive three-state smart window, thereby improving the light transmission efficiency. As a high light transmittance and low reflection material, aluminum oxide film is very suitable as the anti-reflection layer 3. The thickness can effectively reduce reflection while avoiding light absorption and cost increase caused by excessive thickness.

[0055] The thickness of the air layer 4 is The air layer 4 is used as a spacer between the anti-reflection layer 3 and the second phase change layer 5, and its main function is to provide heat insulation. Air is a good heat insulation material and can effectively reduce the heat transfer between the two layers of phase change materials. The thickness ensures sufficient thermal insulation effect while avoiding the increase in overall thickness and cost caused by excessive thickness.

[0056] The material of the second phase change layer 5 is , the thickness of the second phase change layer 5 is The second phase change layer 5 is made of perovskite material and also has thermoinduced phase change characteristics. Unlike the first phase change layer 2, the second phase change layer 5 may undergo phase change at a higher temperature, thereby further adjusting the light transmittance of the thermally responsive three-state smart window. The thickness not only ensures the performance of the phase change material, but also avoids the difficulty of preparation and increased cost caused by excessive thickness.

[0057] The material of the second substrate layer 6 is ordinary glass, and the thickness of the second substrate layer 6 is The second substrate layer 6 is the innermost layer of the thermal responsive three-state smart window and is usually made of ordinary glass material. Glass has excellent light transmittance and mechanical strength, and can meet the basic requirements of the thermal responsive three-state smart window. The thickness ensures sufficient structural strength while avoiding the increase in weight and cost caused by excessive thickness.

[0058] In the preparation process of the thermal responsive three-state smart window, the first phase change layer 2 ( The preparation of thin films is a core step. In this embodiment, radio frequency magnetron sputtering technology is used to deposit the first substrate layer 1 (aluminum oxide). Doping Metal film. In this process, metal Target and metal The RF sputtering power of the target was set to 25 W and 150 W respectively. Such power setting is intended to ensure uniform deposition of metal films and control and ratio, thus obtaining a product with specific properties alloy film.

[0059] The deposited The alloy film was oxidized by wet oxidation in a tube furnace. In this step, the working pressure was set to 1.0Pa and the argon flow rate was 80SCCM. The wet oxidation method can oxidize the alloy film into an oxide film with a specific chemical composition under relatively mild conditions. Through this step, a film with excellent thermoinduced phase change properties was obtained. The film serves as the first phase change layer 2 of the thermally responsive three-state smart window.

[0060] The preparation of the second phase change layer 5 (perovskite film) is also an important step. In this embodiment, the perovskite film is prepared on the surface of the second substrate layer 6 by spin coating. In this process, the perovskite precursor is first dripped onto the surface of the second substrate layer 6, and then placed in a spin coater for high-speed rotation. The rotation speed is set to 500 rpm for 10s and 3000 rpm for 35s. Such speed setting is intended to ensure uniform distribution and rapid solidification of the perovskite precursor on the substrate layer.

[0061] The spin-coated perovskite film was placed on a hot plate at 100°C for drying for 30 minutes. This step is intended to remove the solvent and residual moisture in the film, while promoting the growth of perovskite crystals and stabilization of the structure. Through this step, we obtained a perovskite film with excellent thermoinduced phase change properties as the second phase change layer of the thermally responsive three-state smart window 5.

[0062] like Figure 2 and Figure 3 As shown in the figure, for doped vanadium oxide with sputtering time of 10min, 15min and 20min, its typical temperature-dependent resistance curve is shown in the figure. It can be seen that the phase transition temperature is between 35 and 40℃, and the phase change magnitude is close. Within this range, the spectral modulation amplitude is greater than 20%.

[0063] like Figure 4 As shown in Figure 2, for perovskite films, before the phase transition, The spectral transmittance is greater than 75% within the range. After the phase change, the spectral transmittance drops significantly to below 45%.

[0064] Example 1

[0065] See the specific implementation mode, in the embodiment of this application The sputtering time was set to 10 min. The sputtering time was set to 1min10s.

[0066] like Figure 1 and Figure 5 As shown, in the cold state, neither material undergoes phase change, so both are in a high transmittance state in the infrared and near-infrared bands, ensuring the lighting and heat collection of the room. The spectral transmittance is greater than 50% in both bands; when the temperature rises, it enters a warm state, and the tungsten-doped vanadium dioxide has a lower transition temperature and undergoes a phase change, so that most of the near-infrared light is isolated, reducing heat accumulation. At this stage, the transmittance of the near-infrared band drops to 30%; the temperature rises further and enters a hot state. At this time, the perovskite film also undergoes a phase change, so that the transmittance of the visible light band also decreases and is less than 20%, thereby greatly reducing the energy consumption of the building. The process of overall spectrum regulation does not require any additional energy input. The thermally responsive three-state smart window of the embodiment of the present application only adaptively changes the dual-band spectral transmittance according to the ambient temperature and solar radiation.

[0067] Example 2

[0068] See the specific implementation mode, in the embodiment of this application The sputtering time was set to 15 min. The sputtering time was set to 1min20s.

[0069] like Figure 1 and Figure 6 As shown in the figure, in the cold state, neither material undergoes phase change, so both are in a high transmittance state in the infrared and near-infrared bands, ensuring the lighting and heat collection of the room. The spectral transmittance is greater than 43% in both bands; when the temperature rises, it enters the warm state, and the tungsten-doped vanadium dioxide has a lower transition temperature and undergoes a phase change, which isolates most of the infrared heat and reduces the accumulation of heat. At this stage, the transmittance in the near-infrared band drops to 25%; the temperature rises further and enters the hot state, at which time the perovskite film also undergoes a phase change, causing the transmittance in the visible light band to drop to less than 13%, thereby greatly reducing the energy consumption of the building.

[0070] Example 3

[0071] See the specific implementation mode, in the embodiment of this application The sputtering time was set to 20 min. The sputtering time was set to 1min 25s.

[0072] like Figure 1 and Figure 7 As shown in the figure, in the cold state, neither material undergoes phase change, so both are in a high transmittance state in the infrared and near-infrared bands, ensuring the lighting and heat collection of the room. The spectral transmittance is greater than 38% in both bands; when the temperature rises and enters the warm state, the tungsten-doped vanadium dioxide has a lower transition temperature and undergoes a phase change, which isolates most of the infrared heat and reduces the accumulation of heat. At this stage, the transmittance in the near-infrared band drops to 20%; the temperature rises further and enters the hot state, at which time the perovskite film also undergoes a phase change, causing the transmittance in the visible light band to drop to less than 10%, thereby greatly reducing the energy consumption of the building.

[0073] It should be noted that, in this application, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "includes a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0074] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A thermally responsive three-state smart window, characterized in that: The thermally responsive three-state smart window comprises, from the outside to the inside, a first substrate layer (1), a first phase change layer (2), an anti-reflection layer (3), an air layer (4), a second phase change layer (5) and a second substrate layer (6); The first phase change layer (2) is attached to the first base layer (1), the anti-reflection layer (3) is attached to the first phase change layer (2), the anti-reflection layer (3) and the second phase change layer (5) are separated by the air layer (4), and the second phase change layer (5) is attached to the second base layer (6); The thermal response three-state smart window includes a cold state, a warm state and a hot state, wherein: In a cold state, neither the first phase change layer (2) nor the second phase change layer (5) undergoes phase change, and visible light and near-infrared wavelengths pass through the thermally responsive three-state smart window at an initial transmittance; In a warm state, the first phase change layer (2) undergoes a phase change, visible light passes through the thermal responsive three-state smart window at an initial transmittance, and the transmittance of near-infrared wavelengths decreases; In a hot state, the first phase change layer (2) and the second phase change layer (5) both undergo phase change, and the transmittance of visible light and the transmittance of near-infrared wavelengths both decrease.

2. The thermally responsive three-state smart window according to claim 1, characterized in that: The material of the first substrate layer (1) is aluminum oxide, and the thickness of the first substrate layer (1) is .

3. The thermally responsive tri-state smart window according to claim 1, characterized in that: The material of the first phase change layer (2) is , the thickness of the first phase change layer (2) is .

4. The thermally responsive tri-state smart window according to claim 1, characterized in that: The material of the anti-reflection layer (3) is an aluminum oxide film, and the thickness of the anti-reflection layer (3) is .

5. The thermally responsive tri-state smart window according to claim 1, characterized in that: The thickness of the air layer (4) is .

6. The thermally responsive tri-state smart window according to claim 1, characterized in that: The material of the second phase change layer (5) is , the thickness of the second phase change layer (5) is .

7. The thermally responsive tri-state smart window according to claim 1, characterized in that: The material of the second base layer (6) is ordinary glass, and the thickness of the second base layer (6) is .

8. The method for preparing a thermally responsive three-state smart window according to any one of claims 1 to 7, characterized in that: The method comprises: Using the first substrate layer (1) as the starting layer of the thermally responsive three-state smart window; Deposited on the first substrate layer (1) by radio frequency magnetron sputtering Doping Metal film, forming alloy film, the The alloy film was oxidized by wet oxidation in a tube furnace. A thin film forming a first phase change layer (2); In the The surface deposition thickness of the film is an aluminum oxide film to form an anti-reflection layer (3); A perovskite film is manufactured by a spin coating method to form a second phase change layer (5); The first substrate layer (1) and the second substrate layer (6) are sealed to obtain the thermally responsive three-state smart window.

9. The preparation method according to claim 8, characterized in that: The method comprises depositing on the first substrate layer (1) by radio frequency magnetron sputtering Doping Metal film, forming alloy film, the The alloy film was oxidized by wet oxidation in a tube furnace. The film forms a first phase change layer (2), comprising: The metal Target and metal The RF sputtering powers of the targets were set to 25 W and 150 W, respectively, the working pressure was 1.0 Pa, and the argon gas flow rate was 80 SCCM.

10. The preparation method according to claim 8, characterized in that: The method of using a spin coating method to manufacture a perovskite film to form a second phase change layer (5) comprises: A perovskite precursor is dripped onto the surface of the second substrate layer (6), and the layer is placed in a spin coater, with high-speed rotation at 500 rpm for 10 s and 3000 rpm for 35 s, and the layer is placed on a hot plate at 100° C. and dried for 30 minutes to obtain the perovskite film.

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