TY - JOUR
T1 - Hollow mesoporous organosilica nanospheres templated with flower-like micelles of pentablock copolymers
AU - Cho, Eun Bum
AU - Choi, Eunji
AU - Yang, Shu
AU - Jaroniec, Mietek
N1 - Publisher Copyright:
© 2018 Elsevier Inc.
PY - 2018/10/15
Y1 - 2018/10/15
N2 - We present a facile preparation of hollow mesoporous organosilica nanospheres with well-defined, uniform mesopores by controlling the morphology of pentablock copolymer templates under acidic conditions. The CBABC type poly(lactic acid-co-glycolic acid)-b-poly(ethylene oxide)-b-poly(propylene oxide)-b-poly(ethylene oxide)-b-poly(lactic acid-co-glycolic acid) (PLGA-b-PEO-b-PPO-b-PEO-b-PLGA) pentablock copolymers were synthesized via a step-growth and ring-opening polymerization method using Pluronic F68 and F108 as macro-initiators. Two kinds of pentablock copolymers, (LA45GA12)EO75PO30EO75(LA45GA12) and (LA28GA9)EO141PO54 EO141(LA28GA9), were used as single soft templates to prepare mesoporous ethane-silica and benzene-silica hollow nanospheres by sol-gel chemistry in acidic aqueous solutions. The inner cavity diameter was controlled up to ∼20 nm by varying acidity and the chain length of the hydrophobic PLGA block without using additional swelling agents. The evolution of hollow nanospheres could be explained by single flower-like micelle template mechanism and the variation of morphology of pentablock copolymers upon solution acidity. Moreover, the amine-functionalized hollow benzene-silica nanospheres showed high carbon dioxide adsorption at ambient conditions. The hollow organosilica nanospheres were characterized by small-angle X-ray scattering, nitrogen adsorption-desorption, solid-state 13C- and 29Si nuclear magnetic resonance, and scanning and transmission electron microscopy and so on.
AB - We present a facile preparation of hollow mesoporous organosilica nanospheres with well-defined, uniform mesopores by controlling the morphology of pentablock copolymer templates under acidic conditions. The CBABC type poly(lactic acid-co-glycolic acid)-b-poly(ethylene oxide)-b-poly(propylene oxide)-b-poly(ethylene oxide)-b-poly(lactic acid-co-glycolic acid) (PLGA-b-PEO-b-PPO-b-PEO-b-PLGA) pentablock copolymers were synthesized via a step-growth and ring-opening polymerization method using Pluronic F68 and F108 as macro-initiators. Two kinds of pentablock copolymers, (LA45GA12)EO75PO30EO75(LA45GA12) and (LA28GA9)EO141PO54 EO141(LA28GA9), were used as single soft templates to prepare mesoporous ethane-silica and benzene-silica hollow nanospheres by sol-gel chemistry in acidic aqueous solutions. The inner cavity diameter was controlled up to ∼20 nm by varying acidity and the chain length of the hydrophobic PLGA block without using additional swelling agents. The evolution of hollow nanospheres could be explained by single flower-like micelle template mechanism and the variation of morphology of pentablock copolymers upon solution acidity. Moreover, the amine-functionalized hollow benzene-silica nanospheres showed high carbon dioxide adsorption at ambient conditions. The hollow organosilica nanospheres were characterized by small-angle X-ray scattering, nitrogen adsorption-desorption, solid-state 13C- and 29Si nuclear magnetic resonance, and scanning and transmission electron microscopy and so on.
KW - Flower-like micelle
KW - Hollow nanosphere
KW - Large mesopore
KW - Mesoporous organosilica
KW - Pentablock copolymer
UR - http://www.scopus.com/inward/record.url?scp=85047648879&partnerID=8YFLogxK
U2 - 10.1016/j.jcis.2018.05.076
DO - 10.1016/j.jcis.2018.05.076
M3 - Article
C2 - 29843060
AN - SCOPUS:85047648879
SN - 0021-9797
VL - 528
SP - 124
EP - 134
JO - Journal of Colloid and Interface Science
JF - Journal of Colloid and Interface Science
ER -