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.
Na
Wei
W
College of Materials Science and Engineering, Beijing University of Technology, 100 Pingleyuan, Chaoyang District, Beijing 100124, People's Republic of China.
Wei
Qi
Q
Zou
Ze-Chang
ZC
Li
Qun-Yan
QY
Nie
Zuo-Ren
ZR
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