Rectification of nanopores at surfaces.
Rectification of nanopores at surfaces.
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DOI:
10.1021/ja203883q
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发表时间:
2011-07-13
影响因子:
15
通讯作者:
Baker, Lane A.
中科院分区:
文献类型:
--
作者:
Sa, Niya;Baker, Lane A.
At the nanoscale, methods to measure surface charge can prove challenging. Herein we describe a general method to report surface charge through the measurement of ion current rectification of a nanopipette brought in close proximity to a charged substrate. This method is able to discriminate between charged cationic and anionic substrates when the nanopipette is brought within distances from ten to hundreds of nanometers from the surface. Further studies of the pH dependence on the observed rectification support a surface-induced mechanism and demonstrate the ability to further discriminate between cationic and nominally uncharged surfaces. This method could find application in measurement and mapping of heterogeneous surface charges and is particularly attractive for future biological measurements, where noninvasive, noncontact probing of surface charge will prove valuable.
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DOI:
10.1021/la2005612
发表时间:
2011-05-17
期刊:
Langmuir : the ACS journal of surfaces and colloids
影响因子:
--
作者:
Actis P;Vilozny B;Seger RA;Li X;Jejelowo O;Rinaudo M;Pourmand N
通讯作者:
Pourmand N
DOI:
10.1073/pnas.0900306106
发表时间:
2009-03-24
影响因子:
11.1
作者:
Umehara, Senkei;Karhanek, Miloslav;Pourmand, Nader
通讯作者:
Pourmand, Nader
影响因子:
9.9
作者:
MORRA, M;OCCHIELLO, E;JOHNSON, D
通讯作者:
JOHNSON, D
影响因子:
3.9
作者:
Li, Hai;Zhang, Juan;Zhang, Hua
通讯作者:
Zhang, Hua
影响因子:
10.8
作者:
Daiguji, H;Oka, Y;Shirono, K
通讯作者:
Shirono, K