Journal
ADVANCED MATERIALS
Volume 30, Issue 11, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201705933
Keywords
cyclodextrin; Janus pathways; membranes with intrinsic microporosity; molecular sieving nanofilms
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Funding
- National Research Foundation, Prime Minister's Office, Singapore [NRF-CRP14-2014-01, R-279-000-466-281]
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Precise molecular sieving architectures with Janus superhighways are constructed via a molecularly engineered interfacial reaction between cyclodextrin (CD) and trimesoyl chloride (TMC). Interestingly, the CD/TMC nanofilms constructed with both hydrophobic inner cavities and hydrophilic channels exhibit exceptionally high permeances for both polar and nonpolar solvents. The precise molecular sieving functions are determined by the type of CD building blocks and the inner cavities of intrinsic 3D hollow bowls. Positron annihilation spectroscopy (PAS) confirms that a larger inner CD cavity tends to generate a larger free volume and higher microporosity. Based on the rejection ratio of various dyes, the estimated molecular weight cutoff of CD/TMC nanofilms follows the trend of alpha-CD/TMC (320 Da)
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