Mesoporous organosilicas with ultra-large pores: mesophase transformation and bioadsorption properties.
Large pore ordered mesoporous organosilicas (OMOs) with distinct mesophase structure was synthesized under low temperatures by the co-condensation of 1,2bis(triethoxysilyl)ethane (BTESE) and tetraethyl orthosilicate (TEOS) in acidic solution, using triblock copolymer F127 as a template and 1,3,5-trimethylbenzene (TMB) as a swelling agent. With the decrease of temperature, a mesophase transformation from 2D hexagonal structure (p6mm) via mesostructured cellular foam to a highly ordered 3D cubic structure (Fm3m) was evidenced by small angle X-ray diffraction (SAXS), transmission electron microscopy (TEM) and N(2) sorption. It reveals that the lower synthesis temperatures may influence the hydrolysis and condensation of silica species and the hydrophilic-hydrophobic property of F127, as well as the swelling capacity of F127 micelles with TMB, which resulting in a formation of large pores ordered mesoporous organosilicas with various mesostructures materials. Finally, the enzyme adsorption properties of the OMOs were investigated and the results showed that the OMOs with a 3D large pore structure and regular morphology is much more qualified for enzyme adsorption.
College of Materials Science and Engineering, Beijing University of Technology, 100 Pingleyuan, Chaoyang District, Beijing 100124, People's Republic of China.
Wei
W
Na
Qi
Q
Wei
Ze-Chang
ZC
Zou
Qun-Yan
QY
Li
Zuo-Ren
ZR
Nie
D000327:Adsorption; D057927:Hydrophobic and Hydrophilic Interactions; D017646:Organosilicon Compounds / Q000138:chemical synthesis* / Q000737:chemistry*; D010206:Papain / Q000737:chemistry* / Q000378:metabolism; D010316:Particle Size; D011095:Polyethylenes / Q000737:chemistry; D011126:Polypropylenes / Q000737:chemistry; D016062:Porosity; D013499:Surface Properties; D013696:Temperature
D017646:Organosilicon Compounds; D011095:Polyethylenes; D011126:Polypropylenes; C078661:UCON 50-HB-5100; D010206:Papain