Table 1. Overview of the Properties of Reported Flexible Aerogels.

precursor	synthesis and drying technique	key properties	suitable applications	ref
methyltrimethoxysilane (MTMS)	two-step sol–gel process and SAD supercritical alcohol drying	flexible aerogels having compressibility ∼60%, with water contact angle ∼164°	insulation	(69)
			oil spill clean up
TEOS and polyrotaxane	one-pot base-catalyzed sol–gel process and SCD	flexible and transparent aerogels, low thermal conductivity 0.012–0.015 W/m·K, density ∼0.15–0.30 g/cm3	medical applications	(70)
			building insulation
			solar energy
MTMS and DMDMS	two-step sol–gel process and SCD	highly flexible aerogels having spring back behavior stress (∼0.10 MPa)	protective gear	(71)
			flexible electronics
MTMS	single-step sol–gel process and SCD supercritical CO2 drying	transparent and flexible aerogels with 80% linear compression and 95% recoverability	pressure relief mattresses	(72)
			medical devices
MTESt	two-step sol–gel process and SAD	elastic, flexible, and superhydrophobic aerogels, Young’s modulus ∼3.95 × 104 N/m2	structural components	(73)
methyl-triethoxysilane			impact absorption
aromatic diamine	supercritical CO2 drying	flexible	flexible applications	(74)
triisocyanate with silane	supercritical CO2 drying	low bulk density (0.25–0.33 g/cm3), porosity (76–83%), Young’s modulus of 30–70 MPa	oil spill clean-up	(75)
			air filters
			insulations
MTES methyltriethoxysilane	two-step sol–gel process and SAD	light, flexible, hydrophobic, and oleophilic silica aerogels with water contact angle ∼157°	electronics protection	(76)
		maximal stress ∼15.09 kPa	marine equipment
		portable shelters
VTMS vinyltrimethoxysilane	two-step sol–gel process using surfactant and SCD supercritical CO2 drying	transparent and flexible aerogels with 50% compression and almost 100% resilience	vibration dampening	(77)
		thermal conductivity ∼0.0153 W/m·K	impact absorption
MTMS and GPTMS	two-step sol–gel process and SCD	flexible aerogels with 100% recoverability, Young’s modulus ∼0.46 MPa	smart textile	(78)
		thermal conductivity ∼0.0336 W/m·K	sensors
			flexible electrodes
TEOS and aramid fibers	single-step sol–gel process and APD	flexible aerogels with thermal conductivity between 0.0221 and 0.0235 W/m·K	building insulation	(79)
			pipe cooling