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231224s2013 xx |||||o 00| ||eng c |
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|a 10.1021/la402934m
|2 doi
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|a eng
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|a Kannan, Balamurali
|e verfasserin
|4 aut
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| 245 |
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|a Fabrication of surface charge gradients in open-tubular capillaries and their characterization by spatially resolved pulsed streaming potential measurements
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|c 2013
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|a Text
|b txt
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|a ƒaComputermedien
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|a ƒa Online-Ressource
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|a Date Completed 24.07.2014
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|a Date Revised 10.12.2013
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|a published: Print-Electronic
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|a Citation Status PubMed-not-MEDLINE
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|a Surface charge gradients have been formed on the inside surface of 75 μm i.d. silica capillaries via controlled rate infusion using 3-aminopropyltriethoxysilane as the reactive precursor. These 400 mm length gradients have been characterized using spatially resolved streaming potential measurements, from which the zeta potential as a function of distance was determined. The gradient capillaries exhibited a gradual variation in zeta potential from top to bottom, whereas uniformly modified and as-received capillaries were relatively homogeneous along their length. For a gradient prepared with a relatively high concentration of aminosilane, the zeta potential changed over 60 mV from one end of the capillary to the other, yielding a variation in the magnitude of the apparent surface charge of ~7 fold. By changing the concentration of the aminoalkoxysilane and/or the rate of infusion, both the value of the zeta potential (and hence surface charge) and its spatial profile (i.e., rate of change with distance) could be manipulated
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|a Journal Article
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|a Nokura, Kenji
|e verfasserin
|4 aut
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|a Alvarez, Julio C
|e verfasserin
|4 aut
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| 700 |
1 |
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|a Higgins, Daniel A
|e verfasserin
|4 aut
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| 700 |
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|a Collinson, Maryanne M
|e verfasserin
|4 aut
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| 773 |
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1992
|g 29(2013), 49 vom: 10. Dez., Seite 15260-5
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|g volume:29
|g year:2013
|g number:49
|g day:10
|g month:12
|g pages:15260-5
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