Questions about the clearest solid

What remains when a gel's liquid is removed without collapsing its solid network: an ultra-low-density solid that is mostly air by volume, an exceptional thermal insulator, and — when its nanoscale skeleton is uniform — optically transparent.

Rayleigh scattering. The silica skeleton is nanometre particles and pores; any size dispersion scatters short (blue) wavelengths most. Uniformity far below the wavelength of visible light is what makes an aerogel clear.

Growing ice crystals tear the nanoscale network into micron-scale pores, which scatter light strongly. Conventional freeze-drying therefore yields white, opaque cryogels rather than transparent monoliths.

Panacea Bio Chem's levitated lyophilization: the frozen cake levitates inside its glass container, touching no wall, spun at high orbital speed through sublimation — no interface to nucleate against and no static planes to grow along. Process parameters remain Panacea intellectual property pending peer review.

In-house measurements place it at supercritical-class optical transparency — the most transparent commercially available aerogel we know of to date. Exact figures will be published with the peer-reviewed method.

Yes — SiCellA, a silanized cellulose aerogel from Ivan Smalyukh's group at the University of Colorado Boulder (97–99% visible transmission, certified 2024). It is a research material, not a commercial product. Panacea's claim concerns commercially available aerogel made by a scalable, water-based, pressure-free process.

Insulating window glazing, solar-thermal receivers, cryogenic viewports, scientific optics and lighting — anywhere daylight must pass while heat is kept.

Samuel Stephens Kistler, who published the first aerogels in Nature in 1931 using supercritical drying. Read the full credited timeline on The Story.