An innovative technology for architectural building materials :

Our coating exploits thermochromic nanoparticles which are heat-sensitive and switch color with temperature variations. It reversibly changes its color from dark to white around 25-30°C. 

As a result, the surface temperature is cooler compared to an uncoated surface during hot days and warmer during cold ones.

Outside temperature: 18°C

Outside temperature: 33°C

How does it work ?

Thermochromic particles are three-component systems formed by a solvent, a color developer, and a color former. 

In the cold state, below the transition temperature, the solvent is in its solid state and the color former and color developer creates a complex by hydrogen bonding, thus giving a color to the thermochromic particle. 

In the hot state, above the transition temperature, the solvent melts and solvent-color developer complexes are predominant by dipolar coupling, thus the thermochromic particle becomes colorless. 

In other words, after absorbing a certain amount of heat, the molecular structure of the thermochromic substance reversibly changes in such a way that it interacts differently with solar radiation and light, revealing a high and low total solar reflectances in the hot and cold states respectively.

Why it’s difficult ?

When applied to buildings’ external envelopes, thermochromic materials are able to minimize the energy spent for space heating and cooling. Nevertheless, this technology shows poor weather resistance under exterior conditions. Currently, we are working on a system to light stabilize and to improve the outdoor durability of this technology and therefore, enable its outdoor applications. 

Join us to be part of this journey!

Our way of fighting against climate change:

Making buildings adaptable to external conditions to create smart and resilient cities.