Calorimetric Study of Mesoporous SBA-15 Modified for Controlled Valproic Acid Delivery

Table 1

Characterization of modified SBA-15 with aminopropyl groups and the carriers loaded with valproic acid.

Sample	Initial molar ratio APTES SBA-15^a	Amount of aminopropyl group in the carrier^b (mol⋅g^−1)	𝑆BET (m^3⋅g^−1)	BJH pore volume (cm^3)	𝑡-plot micropore volume (cm^3)	Average pore diameter (nm)
SBA-15	—	—	825	1.08	0.0776	6.9
SBA-15-AP(1 : 25)	(1 : 25)	6.37×10^−3	635	1.01	0.0277	6.2
SBA-15-AP(1 : 15)	(1 : 15)	1.74×−10^−3	575	0.88	0.0232	6.0
SBA-15-AP(1 : 5)	(1 : 5)	2.01×10^−3	540	0.77	0.0186	5.8
SBA-15-AP(1 : 1)	(1 : 2)	2.09×10^−3	510	0.73	0.0094	5.7
SBA-15-VA	—	—	640	1.04	0.0297	6.4
SBA-15-AP(1 : 15)-VA	—	—	360	0.58	0.0000	6.4

^aSBA-15 expressed as SiO₂.
^bCalculated from elemental analysis.