“…Powder of sodium alginate, as received, had a bulk density of 0.509 ± 0.017 g/mL and the reported skeleton density of sodium alginate is 1.6010 ± 0.0002 g/mL (Censi, Gigliobianco, Malaj, & Di Martino, 2016). From this data, we estimated a porosity of the sodium alginate powder of 68.2 ± 1.1 % -for details on the bulk and skeletal density of aerogels see (Fitzpatrick, Staiger, Deb-Choudhury, & Ranford, 2018). Calcium carbonate (CaCO 3 , Sigma Aldrich), Dglucono-δ-lactone (GDL, Sigma Aldrich), aminopropyltriethoxysilane (APTES, 97%, Sigma-Aldrich), (3trimethoxysilylpropyl)diethylenetriamine (TMPMT, 95%, Fluorochem), Nphenylaminomethyltriethoxysilane (PATES, 95%, Fluorochem), thiocyanatopropyltriethoxysilane (TCTES, 95%, Fluorochem), glycidoxypropyltrimethoxysilane (GPTMS, 98%, Sigma Aldrich), phenyltriethoxysilane (PTES, 97%, Gelest), sodium hydroxide (NaOH, Sigal), hydrochloric acid (HCl, Sigal) were used without further purification.…”