UrbanMines leads Nano-cesium tungsten bronze upgrade

Nano-cesium tungsten bronze: Ushering in a new era of transparent thermal insulation, UrbanMines Tech. Ltd. leads the industry upgrade.

With the ongoing implementation of the "dual-carbon" strategy and the growing awareness of energy conservation and environmental protection, how to ensure that architectural glass and car windows maintain both clear visibility and effective heat insulation in summer has become a crucial issue in materials science. The emergence of nano-cesium tungsten bronze (CsₓWO₃) offers an ideal solution to this long-standing industry challenge. This functional nanomaterial, possessing unique optical properties and remarkable light-transmitting but heat-impermeable characteristics, is rapidly becoming a star material in fields such as building energy conservation, automotive thermal management, and functional textiles.

What is nano-cesium tungsten bronze?

Nano-cesium tungsten bronze is a non-stoichiometric functional compound composed of cesium, tungsten, and oxygen, possessing a unique oxygen octahedral crystal structure. This structure endows the material with a series of excellent physicochemical properties—low resistivity, outstanding optical properties, and superior near-infrared shielding capabilities.

UrbanMines Tech. Ltd.'s custom-developed nano-cesium tungsten bronze powder is a representative product in this field. With a particle size of 20-30 nanometers and a purity of up to 99.9%, this product is presented as a bluish-black powder and exhibits superior performance in the field of transparent thermal insulation. Through continuous optimization of the cesium-tungsten ratio, reaction temperature, and surface treatment processes, UrbanMines Tech. Ltd. can now stably provide nano-cesium tungsten bronze products in various specifications, including aqueous and solvent-based dispersions, to meet the differentiated needs of different application scenarios.

The core properties of nano-cesium tungsten bronze: a perfect balance between transparency and heat insulation.

The most outstanding feature of nano-cesium tungsten bronze is that it achieves the optical effect of "having the best of both worlds".

High visible light transmittance: In the 550 nm visible light band, the transmittance of nano-cesium tungsten bronze bronze film can reach more than 70%, which means that it can maintain the clear transparency of glass and will not affect indoor lighting or driving visibility.

Strong near-infrared absorption capability: In the near-infrared region of 800-1200 nm (the main source of solar heat), nano-cesium tungsten bronze exhibits strong absorption characteristics. This characteristic stems from its unique surface plasmon resonance effect—the free electrons in the material are particularly sensitive to near-infrared light with wavelengths of 780-2500 nm, and can efficiently intercept the near-infrared portion of the solar spectrum (accounting for about 50% of the total solar energy).

In practical applications, the products from UrbanMines Tech. Ltd. have demonstrated particularly outstanding performance. Test coatings made by adding the product at a ratio of 1-3% to paint showed an infrared blocking rate of up to 95%, a visible light transmittance of 78%, and a UV blocking rate of 52%. Only about 2 grams per square meter of glass coating is needed to achieve significant heat insulation effects.

A list of the latest application areas

I. Architectural Glass and Energy-Saving Curtain Walls

The construction industry is one of the main application areas for nano-cesium tungsten bronze. Modern buildings extensively use glass curtain walls and floor-to-ceiling windows, which improve lighting but also allow a large amount of solar radiation heat to enter the interior, significantly increasing air conditioning energy consumption.

Nano-cesium tungsten bronze can be used to create a transparent heat-insulating coating, which can be applied to the surface of architectural glass or laminated with intermediate films such as PVB and EVA. This effectively blocks infrared radiation from entering the room without affecting the transparency of the glass. Practical application data shows that after using a coating with added cesium tungsten bronze, the infrared blocking rate of the glass can be increased from 40% to 91%, the ultraviolet blocking rate from 31% to 97%, and the light transmittance remains at 61%.

In the field of building curtain walls and windows, nano-cesium tungsten bronze insulated glass can significantly reduce air conditioning energy consumption—saving more than 30%—while maintaining natural lighting and improving the indoor lighting environment. Compared to traditional low-emissivity coated glass, the cost of adding cesium tungsten bronze coating is only one-third, and it does not require changes to the glass manufacturing process, making it highly valuable for commercial promotion.

II. Automotive heat insulation film and laminated glass

The automotive industry continues to grow its demand for transparent thermal insulation materials. Under the scorching summer sun, the interior temperature of a car can easily rise above 60°C, affecting not only driving and riding comfort but also forcing the air conditioning system to operate at high intensity.

Transparent heat-insulating film made of nano-cesium tungsten bronze can effectively reduce the temperature inside the vehicle, improve driving comfort, and does not obstruct the driver's view. It can also block some ultraviolet rays to protect the interior. More importantly, because its heat insulation mechanism is absorption rather than metal reflection, the use of cesium tungsten bronze heat-insulating film does not affect GPS, ETC, or mobile phone signals at all.

For the automotive OEM market, UrbanMines Tech. Ltd. 's solution involves embedding a functional layer containing nano-cesium tungsten bronze into a PVB interlayer to manufacture original equipment laminated glass. This type of glass inherently possesses excellent heat insulation, sound insulation, and UV protection properties, and is becoming a key feature for improving the energy efficiency of high-end new energy vehicles. For electric vehicles, effectively reducing the heat load inside the vehicle can significantly reduce the electrical energy required for air conditioning, directly increasing the driving range.

III. Functional Textiles

The application of nano-cesium tungsten bronze is expanding from traditional construction and automotive fields to functional textiles. Recent research in 2026 indicates that this material has unique application value in the functional finishing of textiles.

Because near-infrared light has a heating effect on the human body, outdoor clothing in summer needs to effectively insulate against heat while maintaining breathability. Nano-cesium tungsten bronze has excellent near-infrared shielding performance, high visible light transmittance, and good chemical stability. By adding it to fabrics through methods such as padding, coating, or blending spinning, it can achieve the function of "lightweight and heat insulation" while maintaining the appearance and breathability of the fabric.

Cotton fabrics treated with nano-cesium tungsten bronze can raise their surface temperature by approximately 16°C within 75 seconds under simulated sunlight, demonstrating excellent photothermal conversion properties. From all-season clothing to professional functional apparel such as skiwear, mountaineering gear, and sun-protective clothing, the applications of nano-cesium tungsten bronze are continuously expanding, injecting new vitality into the textile industry.

IV. Expansion into Cutting-Edge Fields

In addition to the aforementioned mature application areas, nano-cesium tungsten bronze also shows great potential in several cutting-edge directions:

Smart windows and electrochromic devices: As a high-performance electrochromic material, nano-cesium tungsten bronze dispersion has shown broad application prospects in smart windows, displays and other fields, and can dynamically regulate the transmission of sunlight and heat.

Photothermal therapy: In the medical field, nano-cesium tungsten bronze is used for photothermal therapy. After the nanoparticles are injected into the human body, they are irradiated by an external light source to convert light energy into heat energy to kill cancer cells. It has the advantages of being highly targeted and having few side effects.

Laser marking and infrared filters: Due to its absorption characteristics of specific wavelength lasers, nano-cesium tungsten bronze is also widely used in laser marking, laser welding and infrared filter manufacturing.

Durability and stability: the inherent advantages of inorganic materials

As an inorganic material, nano-cesium tungsten bronze exhibits significant advantages in durability. Tests show that its film shows no change in appearance after 72 hours of continuous irradiation under a xenon lamp simulating strong sunlight; after immersion in 60°C hot water for 168 hours, its infrared blocking performance only decreases by 1.8%, with an estimated service life of up to 20 years. This allows nano-cesium tungsten bronze to maintain stable thermal insulation performance over long-term exposure environments such as building exterior glass and car windows.

Market Prospects and Industry Trends

With increasing global demands for energy conservation and emission reduction, the transparent thermal insulation materials market is experiencing rapid growth. According to market research, the global revenue from nano-cesium tungsten bronze dispersions was approximately RMB 2.06 billion in 2024 and is projected to reach nearly RMB 3.34 billion by 2031, representing a compound annual growth rate of 7.2%. The Chinese market has seen particularly rapid growth in recent years and is becoming a significant force in the global nano-cesium tungsten bronze industry.

Chinese companies, represented by UrbanMines Tech. Ltd. , are actively promoting the industrial application of nano-cesium tungsten bronze. The company currently offers a variety of products including nano-zinc oxide, nano-alumina, nano-silicon oxide, nano-titanium oxide, and nano-dispersions, committed to providing customers with high-quality nano-oxide products and capable of collaborating on the development of new materials to meet diverse enterprise needs.

Conclusion

The rise of nano-cesium tungsten bronze not only provides innovative solutions for building energy conservation and automotive thermal management, but also demonstrates broad application prospects in diverse fields such as textiles, optoelectronic devices, and medicine. With the continuous maturation of manufacturing processes and the ongoing advancement of industrialization, this material, which "makes glass smarter," will undoubtedly play a vital role in China's journey to achieve its strategic goals of "carbon peaking and carbon neutrality." As a pioneer in this field, UrbanMines Tech. Ltd. is contributing technological strength to the cause of green energy conservation through continuous R&D innovation and superior product quality.