dpore	[nm]	Pore diameter
$ϵ$	[-]	Porosity
ρenv	[kg/m3]	Envelop density
ρskel	[kg/m3]	Skeletal density
SBET	[m2/g]	Specific surface area measured with the BET isotherm
wt.%	[-]	Weight percent
BET	Brunauer–Emmett–Teller
FD	Freeze-drying
FR *	Sample frozen in freezer at −20 °C
G *	Sample gelled before freezing
LN *	Sample frozen in liquid Nitrogen
NG *	Sample frozen without prior gelation
SEM	Scanning electron microscope
SFC	Supercritical drying
* Further details on sample denomination can be found at the end of the Section 4 Material and Methods.