A Facile Strategy for In Situ Core-Template-Functionalizing Siliceous Hollow Nanospheres for Guest Species Entrapment

Table 1 Synthesis details and conditions for the preparation of silica nanospheres

Series	Polymer^a	Divalent metal ion	Ultrasonication^b	Ageing time (min)	Microstructure^c
No. 1	PA2.5	Ca or Sr	US	5, 12, 20	Hollow
No. 2	PA2.5	Ca or Sr	No US	20	Hollow and bulk
No. 3	PA2.5	−	US	20	Bulk
No. 4	PAsp5	Ca or Sr	US	20	Hollow
No. 5	Gelatin	Ca or Sr	US	20	Hollow
No. 6	−	−	No US	20	Bulk

^aPA2.5:M_wca. 2.5 KDa, 30 wt%; Getalin:M_wca. 75 KDa, 10 wt%; PAsp5:M_w5.0 KDa, 30 wt%
^bThe reactions with and without the assistance of ultrasonication (US) condition were denoted as US and no US, respectively
^cThe microstructures of silica particles were characterized by using transmission electron microscopy