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@MASTERSTHESIS{Wang:828407,
author = {Wang, Junmiao},
title = {{S}urface {P}otential of {M}etallic {S}urfaces and
{S}elf-{A}ssembling {O}rganic {M}onolayers in {V}arious
{E}lectrolytes},
volume = {137},
school = {RWTH Aachen},
type = {MS},
address = {Jülich},
publisher = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
reportid = {FZJ-2017-02368},
isbn = {978-3-95806-188-0},
series = {Schriften des Forschungszentrums Jülich. Reihe
Schlüsseltechnologien / Key Technologies},
pages = {II, 58 S.},
year = {2016},
note = {RWTH Aachen, Masterarbeit, 2016},
abstract = {The aim of this thesis is to systematically investigate the
ζ potential of different surfaces (polypropylene,
borosilicate glass, Pt and Au thin films, and
self-assembling monolayer) in different chloride
electrolytes XCl (X = Li, Na, or K), focusing on the pH- and
concentration-dependent ζ potential and the surface
treatment with oxygen. The experiments were performed with a
modified “SurPASS Electrokinetic Analyzer” using the
streaming potential and streaming current methods. The
pH-dependent ζ potential analysis of borosilicate glass,
Pt, and Au shows that, Pt possesses the highest ζ
potential, followed by borosilicate glass and Au for all
chloride electrolytes. The impact of the different
electrolytes on the ζ potential is more complex. The oxygen
activation of the metallic surfaces seems to lead to the
formation of a thin oxide layer, which seems to be less
stable for Pt than for Au, whereas we obtained a stable
oxygen activation for the oxide borosilicate glass. At large
Debye length (i.e. low electrolyte concentration), the ζ
potential changes linearly with decreasing Debye length down
to a “critical” Debye length. The “critical” Debye
length is different for the different surfaces: 0.7 – 0.9
nm for borosilicate glass, 0.5 – 1.2 nm for Pt, and 1.35
– 2 nm for APTES. Below the “critical” Debye length,
the ζ potential drops strongly. We explain the unusual and
transient streaming current-pressure correlation in this
regime by a complex adsorption/desorption process for the
ions at the surface. As a result, the classic electrical
double layer model has to be modified for high electrolyte
concentrations. For organic layers this is even more
complex, since several surface contributions arising from
the molecules and the carrier have to be taken into
account.},
cin = {PGI-8 / ICS-8},
cid = {I:(DE-Juel1)PGI-8-20110106 / I:(DE-Juel1)ICS-8-20110106},
pnm = {899 - ohne Topic (POF3-899)},
pid = {G:(DE-HGF)POF3-899},
typ = {PUB:(DE-HGF)3 / PUB:(DE-HGF)19},
url = {https://juser.fz-juelich.de/record/828407},
}