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High-fidelity 3D Color Printing Achieved by Photochromic Properties of Nano-tungsten Trioxide WO3

A few days ago, the Barcelona Institute of Technology (ICFO) published a discovery in Nano Letters: mixing nano-tungsten oxide particles with polyamide as a photosensitizer for color 3D printing can avoid the problem of discoloration in printing caused by traditional carbon-based photosensitizers , which contributes to the realization of high-fidelity 3D color printing.

 

In order to reduce cost and increase printing speed, selective sintering 3D printing usually incorporates photothermal sensitizers, which can accelerate the rate at which incident light is converted into heat. However, when printing white and color products, commonly used carbon-based photothermal sensitizers are used. Agents can cause discoloration of the work.

 

Previous ICFO related research has used gold-coated nanosilica microspheres to overcome the above problems (ie strong absorption in the near-infrared with minimal interaction with visible light). It turns out that while it works well in color printing, it has limitations when it comes to large gradation colorful high fidelity and pure white printing.

 

This time ICFO uses nano-tungsten oxide (WO3) as a photothermal sensitizer, which greatly reduces the production difficulty and material cost. It is colorless at high concentrations and has strong absorption in the near-infrared region, proving that they can convert light into heat at a very fast rate, making them a fast flux; UV light is effectively activated or deactivated; more importantly, they are stable at very high temperatures and have shown superior heating to color change rates compared to other sensitizers available. Finally, when mixed with other color inks, these nanoparticles were able to reproduce the same color as the original powder, maintaining the color purity of the original sample. This also opens up a new avenue for high-fidelity 3D color printing.

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Nano cesium tungsten oxide plays an important role in glass heat insulation

The promotion and application of energy-saving technologies have reached a global consensus, and many countries have successively introduced related policies. A large proportion of building energy consumption is lost through glass doors and windows. Similarly, in the hot summer, the sun’s exposure through the car glass is unbearable for drivers and passengers, accelerating the aging of the vehicle interior, and greatly increasing fuel consumption, increasing emissions, and damaging the environment. Therefore, it is necessary to find a glass heat-insulating agent that is both transparent and heat-insulating.

Cesium-doped Tungsten Oxide/Cesium Tungsten Bronze is an inorganic nanomaterial with good near-infrared absorption. It has uniform particles, good dispersibility, environmental friendliness, strong light transmission ability, good near-infrared shielding performance, and high transparency. Stand out from other traditional transparent insulation materials. It is a new type of functional material with strong absorption in the near-infrared region (wavelength 800-1200nm) and high transmittance in the visible light region (wavelength 380-780nm).

 

Chinese name: Cesium Tungsten Oxide/nano Cesium Tungsten Bronze 

English name: Cesium Tungsten Bronze，Cs0.33WO3 nanoparticles

CAS number: 189619-69-0

Molecular formula: Cs0.33WO3

Molecular weight: 276

Appearance: dark blue powder

 

At the same time, as a new type of automotive glass heat insulation agent, nano cesium tungsten oxide has the best near-infrared absorption characteristics. Usually, adding 2 g per square meter of coating can achieve an infrared blocking rate of more than 90% at 950 nm and more than 70% at the same time. The visible light transmittance.

The heat-insulating agent has been widely recognized by many glass manufacturers. This heat-insulating agent is used in the production of coated heat-insulating glass, coated heat-insulating glass, and laminated heat-insulating glass, which can significantly improve the comfort of the human body and save energy. . Nano cesium tungsten oxide can be said to be a kind of transparent heat-insulating nano powder. What you need to know is that cesium tungsten bronze nano powder is not really “transparent”, but a dark blue powder. “Transparency” mainly refers to the heat insulation dispersion, heat insulation film and heat insulation paint prepared from cesium tungsten bronze all exhibiting high transparency. Experts said that among them, the production of thermal insulation coatings needs to use film-forming materials, such as acrylic resin. Acrylic resin has excellent color and luster, good light and weather resistance, resistance to ultraviolet radiation without decomposition or yellowing, gloss and color retention, and can maintain the original color for a long time. Acrylic resin is often used in combination with other resins as a film-forming substance for transparent thermal insulation coatings. Some experts use polyurethane acrylate water-based resin as the film-forming material and nano-cesium tungsten bronze as heat-insulating particles to prepare transparent heat-insulating coatings, and apply them to architectural glass. Studies have shown that the coating has a transmittance of about 75% in the visible light region.

Hongwu Nano Company is now supplying nano-tungsten oxide in batches, including yellow tungsten, blue tungsten, purple tungsten, and nano-cesium tungsten oxide. The quality is reliable and you can directly seek quotations online. Welcome to cooperate.

 

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Nano-tungsten oxide & titanium dioxide — new advanced nano transparent heat-insulating coating

Breif introduction:
Nano transparent thermal insulation coating is a ceramic thermal insulation water-based coating. It adopts the latest composite ceramic nano-tungsten oxide insulation material and is designed to absorb infrared infrared light. Nano transparent thermal insulation coatings are unique environmentally friendly ingredients – nano tungsten oxide liquid, titanium dioxide can remove odors in the surrounding environment, and degrade formaldehyde and other harmful substances. Nano-transparent thermal insulation coating is a new type of coating that meets the requirements and characteristics of environmentally friendly coatings.

Principle of heat insulation

The principle of thermal insulation of nano transparent thermal insulation coatings is as follows:
1 Nano transparent heat-insulating coating uses advanced production technology to make nano-tungsten oxide and TiO2 into nano-coating materials suitable for surface coating on glass, ceramic tile, metal, cement, PE, PET, PC, PP, PVC, etc. Transparent nano-tungsten oxide, which absorbs near-infrared rays and blocks ultraviolet rays;
2 Nano-tungsten oxide has stable chemical properties and small physical changes caused by external environment such as heat and humidity, so it can maintain permanent semiconductor materials, effectively block infrared radiation and ultraviolet radiation, block infrared effect by 95%, block UV The effect is up to 99%, the coating material has excellent compatibility with the substrate, the spreading and leveling performance is good, the adhesion is strong, and the long-lasting does not fall off;
3 Ceramic powder can effectively block ultraviolet light up to 99%, and can reflect more than 90% of visible light, can block infrared rays up to 92.5%, ceramic molecules can prevent excessive water vapor from entering, and allow normal amount of water molecules to pass, This greatly increases the sunscreen insulation capacity of the entire building surface;
4 Nano transparent heat-insulating coatings are safe and environmentally friendly. All components are nano-inorganic, which is a new type of environmentally friendly coating.

Characteristics:

The characteristics of nano-transparent thermal insulation coatings are as follows:

1 Thermal insulation
The nano transparent heat-insulating coating effectively blocks the infrared rays and ultraviolet rays in the sunlight from entering the room, shielding more than 99% of the ultraviolet rays, blocking the infrared rays of more than 75%, and lowering the indoor temperature by 3-5℃, so that the exposed objects can be dried. The temperature is lowered by 6-10℃.

2 transparent
After the nano transparent heat-insulating coating is applied, a micro-film layer of about 8-10 microns is formed on the surface layer of the substrate, and the visible light transmittance is as high as 70% or more, which does not affect the visual field.

3 energy saving
The effect of heat insulation and heat preservation of nano-transparent heat-insulating coatings extends the indoor and temperature-equal temperature rise and fall, reduces the number of air-conditioning cold or heat machines, and saves air-conditioning energy consumption by 25-35%.

4 Environmental protection
Nano-transparent heat-insulating coatings are water-based coatings that do not contain harmful substances such as TVOC, free formaldehyde, lead, chromium, cadmium, and mercury. They are environmentally friendly and meet the national environmental quality standards. They are a new type of environmentally friendly coating.

5 health
Nano-transparent heat-insulating coatings prevent UV rays from fading and aging of furniture, fabrics, carpets, curtains, murals, etc., and prevent UV-induced skin cancer, cataracts and other diseases.

Application range
1 The glass surface is insulated and resistant to ultraviolet rays;
2 External wall latex paint is insulated and antistatic;
3 PE, PET, PC, PP, PVC insulation, anti-static;
4 lamp cup, lampshade insulation, antistatic, etc.