title: Characterizing the surface charge of synthetic nanomembranes by the streaming potential method.
abstract: The inference of the surface charge of polyethylene glycol (PEG)-coated and uncoated silicon membranes with nanoscale pore sizes from streaming potential measurements in the presence of finite electric double layer (EDL) effects is studied theoretically and experimentally. The developed theoretical model for inferring the pore wall surface charge density from streaming potential measurements is applicable to arbitrary pore cross-sectional shapes and accounts for the effect of finite salt concentration on the ionic mobilities and the thickness of the deposited layer of PEG. Theoretical interpretation of the streaming potential data collected from silicon membranes having nanoscale pore sizes, with/without pore wall surface modification with PEG, indicates that finite electric double layer (EDL) effects in the pore-confined electrolyte significantly affect the interpretation of the membrane charge and that surface modification with PEG leads to a reduction in the pore wall surface charge density. The theoretical model is also used to study the relative significance of the following uniquely nanoscale factors affecting the interpretation of streaming potential in moderate to strongly charged pores: altered net charge convection by applied pressure differentials, surface-charge effects on ionic conduction, and electroosmotic convection of charges.
authors.affiliation: Department of Mechanical Engineering, The Ohio State University, 201 West 19th Avenue, Columbus, OH 43210, USA. datta.20@osu.edu
authors.forename: Subhra
authors.initials: S
authors.lastname: Datta
authors.forename: A T
authors.initials: AT
authors.lastname: Conlisk
authors.forename: Dharmesh M
authors.initials: DM
authors.lastname: Kanani
authors.forename: Andrew L
authors.initials: AL
authors.lastname: Zydney
authors.forename: William H
authors.initials: WH
authors.lastname: Fissell
authors.forename: Shuvo
authors.initials: S
authors.lastname: Roy
mesh_terms: D008567:Membranes, Artificial; D008962:Models, Theoretical; D049329:Nanostructures / Q000737:chemistry*; D011092:Polyethylene Glycols; D016062:Porosity; D012825:Silicon / Q000737:chemistry*; D055672:Static Electricity; D013499:Surface Properties
chemical_list: D008567:Membranes, Artificial; D011092:Polyethylene Glycols; D012825:Silicon
references.citation: Transl Res. 2007 Dec;150(6):327-36
references.pmid: 18022594
references.citation: Biomaterials. 2006 Jun;27(16):3075-83
references.pmid: 16457879
references.citation: Nano Lett. 2007 Apr;7(4):1022-5
references.pmid: 17352506
references.citation: Nano Lett. 2005 Jun;5(6):1147-55
references.pmid: 15943459
references.citation: Anal Chem. 2002 Aug 15;74(16):4117-23
references.pmid: 12199582
references.citation: Electrophoresis. 2004 Feb;25(3):405-14
references.pmid: 14760631
references.citation: Proc Natl Acad Sci U S A. 1955 May 15;41(5):274-83
references.pmid: 16589664
references.citation: Nano Lett. 2005 Sep;5(9):1638-42
references.pmid: 16159198
references.citation: J Chromatogr A. 2002 Mar 1;948(1-2):203-23
references.pmid: 12831198
references.citation: J Phys Colloid Chem. 1947 May;51(3):631-6
references.pmid: 20238663
references.citation: J Colloid Interface Sci. 2001 May 15;237(2):283-289
references.pmid: 11334543
references.citation: ASAIO J. 2006 May-Jun;52(3):221-7
references.pmid: 16760708
references.citation: J Memb Sci. 2009 Jan 5;326(1):58-63
references.pmid: 20054402
references.citation: J Colloid Interface Sci. 2010 Mar 1;343(1):381-6
references.pmid: 20035946
references.citation: Phys Rev Lett. 2005 Sep 9;95(11):116104
references.pmid: 16197024
references.citation: Ann Biomed Eng. 2009 Apr;37(4):722-36
references.pmid: 19184436
references.citation: Electrophoresis. 2004 Jan;25(2):187-202
references.pmid: 14743473