NDLI: How does a star chain (nanooctopus) crawl through a nanopore?

Content Provider	Royal Society of Chemistry (RSC)
Author	Wu, Chi Ge, Hui Pispas, Stergios
Copyright Year	2011
Abstract	The ultrafiltration of star-like polystyrene chains with different arm lengths (LA) and arm numbers (f) passing through a nanopore (20 nm) under an elongational flow field was investigated in terms of the flow-rate dependent relative retention ((C0 − C)/C0), where C0 and C are the polymer concentrations before and after the ultrafiltration. Our results reveal that for a given LA, the critical flow rate (qc,star), below which star chains are blocked, dramatically increases with f; but for a given f, is nearly independent on LA, contradictory to the previous prediction made by de Gennes and Brochard-Wyart. We have revised their theory in the region fin < fout, where fin and fout are the numbers of arms inside and outside the pore, respectively; and also accounted for the effective length of each blob. In the revision, we show that qc,star is indeed independent of LA but related to both f and fin in two different ways, depending on whether fin ≤ f/2 or ≥ f/2. A comparison of our experimental and calculated results reveals that most star chains pass through the nanopores with fin ∼ f/2. Further study of the temperature dependent (C0 − C)/C0 of polystyrene in cyclohexane shows that there exists a minimum of qc,star at ∼38 °C, close to the theta temperature of polystyrene star chains.
Starting Page	1071
Ending Page	1076
Page Count	6
File Format	HTM / HTML PDF
ISSN	17599954
Volume Number	2
Issue Number	5
Journal	Polymer Chemistry
DOI	10.1039/c0py00361a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Wyart Ultrafiltration Quality control Cyclohexane Polymer Los Angeles Nanopore Polystyrene de Gennes
Content Type	Text
Resource Type	Article
Subject	Organic Chemistry Biochemistry Bioengineering Biomedical Engineering Polymers and Plastics

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