Table 1: Physical properties of conventional silica aerogel and Maerogel.

PropertyConventional aerogelMaerogelComments

Apparent density0.003–0.35 g/cm30.03 g/cm3Commonly ~0.1 g/cm3 for conventional aerogels; Usually 0.03 g/cm3 for Maerogel
Internal surface area600–1000 m2/g700–900 m2/g
Mean pore diameter20 nm20.8 nmVaries with density
Particle diameter2–5 nm5 nmDetermined by electron microscopy
Thermal tolerance500°C500°CShrinkage begins gradually at 500°C
Melting point>1200°C>1200°C
Typical thermal conductivity0.015 W/mK0.02 W/mK
Coefficient of thermal expansion2.0–4.0 × 10−62.0–4.0 × 10−6Determined using ultrasonic techniques
Poisson’s ratio0.20.2Independent of density
Young’s modulus106–107 N/m2106–107 N/m2Insignificant compared to dense silica
Tensile strength16 kPa16 kPaFor density of 0.1 g/cm3
Fracture toughness0.8 kPa m0.50.8 kPa m0.5For density of 0.1 g/cm3
Index of refraction1.0–1.051.0–1.05
Dielectric constant~1.1~1.1For density of 0.1 g/cm3
Sound velocity100 m/s100 m/sFor density of 0.07 g/cm3