Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 1, Issue 8, Pages 1834-1842Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am9003842
Keywords
chiral mesopores; silica spheres; chiral block copolymers; enantiomeric separation
Funding
- Israel Science Foundation, Government of Israel [660/07]
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In this work, we synthesized chiral mesoporous silica (CMS) spheres, which can be used as a potential candidate for chiral separation. The CMS spheres with controllable pore sizes (of 2-3 nm) and high surface areas of ca. 614 m(2) g(-1) were synthesized by chiral templating with chiral block copolymers based on poly(ethylene oxide) and DL-glutamic acid [PEO113-b-(GluA)(10)). The ordered structure of the chiral mesopores was characterized by high-resolution transmission electron microscopy, and the average pore diameters of chiral mesopores were estimated from the nitrogen adsorption-desorption measurements. The enantioselectivity properties and chiral resolution kinetics of the mesopores of silica spheres, after extraction of chiral polymers of PEO113-b-(L/D-GluA)(10), were scrutinized using a racemic solution of valine and measuring the circular dichroism and optical polarimetery. A chiral selectivity factor of 5.22 was found with a specific enantiomer of valine adsorbed preferably. These results raise the new possibilities OF CMS spheres for enantiomeric separation and other enantioselective applications.
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