Effects of different chain lengths and chiral branched amino acids on the synthesis of mesoporous silica.
Ordered mesoporous silica was successfully synthesized by using different chain-length chiral anionic surfactants, N-acylalanine and N-acylvaline as templates, and N-trimethoxy silylpropyl-N, N, N-trimethyl ammonium (TMAPS) as a co-structure-directing agent (CSDA) under weakly acidic conditions. The synthesized products were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, and nitrogen sorption analysis. In the TMAPS/N-acylalanine system, the mesophase changed from a 3D disordered stucture into a 3D hexagonally structure for the first, and finally into a 3D cubic structure with increased hydrophobic chain lengths of the anionic surfactants. But in the TMAPS/N-acylvaline system, the mesophase changed into a 2D hexagonally structure for the first, and finally into a 3D hexagonally structured mesoporous silica with the helical pore channels. The changes of the pore diameter, the surface area and the pore volume with the chain lengths were also discussed.
Haitao
H
Liu
Yuxiang
Y
Yang
Lu
L
Liu
Hongming
H
Yuan
Cheng
C
Chen
Xiangnong
X
Liu
D000596:Amino Acids / Q000737:chemistry*; D003460:Crystallization / Q000379:methods*; D008422:Materials Testing; D008968:Molecular Conformation; D008970:Molecular Weight; D058608:Nanopores / Q000648:ultrastructure*; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D010316:Particle Size; D016062:Porosity; D012822:Silicon Dioxide / Q000737:chemistry*; D013499:Surface Properties
D000596:Amino Acids; D012822:Silicon Dioxide