NDLI: Modulating molecular and nanoparticle transport in flexible polydimethylsiloxane membranes

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Modulating molecular and nanoparticle transport in flexible polydimethylsiloxane membranes

Content Provider	PubMed Central
Author	Jiao, Kexin Graham, Chase L. Wolff, Justin Iyer, Ratnasabapathy G. Kohli, Punit
Copyright Year	2012
Abstract	The ability to fabricate flexible filtration membranes that can selectively separate particles of different sizes is of considerable interest. In this article, we describe a facile, reproducible and simple one-step method to produce pores in polydimethylsiloxane (PDMS) membranes. We embedded micron-sized NaHCO3 particles in 50 micron thick PDMS films. After curing, the membranes were immersed in concentrated HCl acid. Pores were generated in the membrane by the evolution of CO2 gas from the reaction of NaHCO3 and HCl. High resolution Scanning Electron Microscope images clearly reveal the presence of openings on the surface and the cross-section of the membranes. Fluorescence and back-scattered electron imaging of porous PDMS membrane with embedded gold nanoparticles and comparison with non-porous PDMS membranes provided unambiguous evidence of pores in the membrane. Transport studies of molecular fluoresceinate ions, ions (sodium and chloride) and 240 nm polystyrene nanoparticles through these membranes demonstrate passable pores and existence of channels within the body of the membrane. Mechanically stretching the porous PDMS membrane and comparing the flow rates of fluoresceinate ions and the polystyrene beads through the stretched and unstretched membranes allowed a direct proof of the modulation of transport rate in the membranes. We show that stretching the membranes by 10% increases the flow rate of fluorescein molecules by 2.8 times and by a factor of approximately ~40% for the polystyrene nanoparticles.
Related Links	http://dx.doi.org/10.1016/j.memsci.2012.01.015
Ending Page	32
Page Count	8
Starting Page	25
File Format	PDF
ISSN	03767388
Journal	Journal of membrane science
Volume Number	401-402
Language	English
Publisher Date	2012-05-01
Access Restriction	Open
Subject Keyword	Physical and Theoretical Chemistry Filtration and Separation Materials Science(all) Biochemistry Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Biochemistry Physical and Theoretical Chemistry Materials Science Filtration and Separation

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