6 — Silixon-HT

Haze Tile

What It Is

Silixon-HT is a smart architectural and aerospace surface tile that combines the structural properties of Silixon-PDC ceramic with an embedded photonic haze layer — a precisely engineered internal scattering network that modulates light transmission, thermal emissivity, and electromagnetic opacity on demand. The term "haze" refers to the controlled forward-scattering behavior of the tile: ambient light entering from one face is diffused and attenuated by the internal scattering centers, producing a translucent appearance that can be switched between states by an applied electric field or by temperature change, without moving parts or liquid crystal layers.

Optical Mechanism

The internal scattering network is formed by a distribution of microsphere inclusions — hollow SiOC spheres of 1–20 µm diameter — suspended in the Silixon ceramic matrix during the green-body casting stage. The sphere size and volume fraction are tuned to set the haze level, scatter angle, and spectral selectivity. In the passive (zero-field) state, the spheres scatter visible and near-infrared light, making the tile appear opaque white — high solar reflectance for thermal management on building facades and spacecraft radiator panels. When an electric field of 50–200 V/cm is applied across embedded transparent electrode layers, the sphere-matrix interface refractive index contrast collapses due to electro-optic poling of the matrix, rendering the tile nearly transparent. This switching mechanism operates with no liquid, no organic electrolyte, and no mechanical wear, making Haze Tiles effectively infinite-life optical shutters.

Thermal and Structural Functions

Beyond optical modulation, Silixon-HT tiles serve as primary structural skin panels on the DART aircraft's fuselage sections not requiring maximum thermal protection. Their ceramic matrix provides the aerodynamic surface stiffness and impact resistance of the Silixon-HS tile at reduced thickness and mass. The high solar reflectance in the passive opaque state keeps the aircraft's interior temperature 40–60 °C cooler during daytime ground operations without active cooling. On building structures, Haze Tiles replace conventional glass curtain wall panels, providing a variable-opacity facade that responds to solar intensity — reducing HVAC loads by an estimated 30–45% in climates with high direct solar insolation.