The persistence length of adsorbed dendronized polymers

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The persistence length of adsorbed dendronized polymers. / Grebikova, Lucie; Kozhuharov, Svilen; Maroni, Plinio; Mikhaylov, Andrey; Dietler, Giovanni; Schlüter, A Dieter; Ullner, Magnus; Borkovec, Michal.

I: Nanoscale, Vol. 8, Nr. 27, 21.07.2016, s. 13498-506.

Forskningsoutput: TidskriftsbidragArtikel i vetenskaplig tidskrift

Harvard

Grebikova, L, Kozhuharov, S, Maroni, P, Mikhaylov, A, Dietler, G, Schlüter, AD, Ullner, M & Borkovec, M 2016, 'The persistence length of adsorbed dendronized polymers', Nanoscale, vol. 8, nr. 27, s. 13498-506. https://doi.org/10.1039/c6nr02665f

APA

Grebikova, L., Kozhuharov, S., Maroni, P., Mikhaylov, A., Dietler, G., Schlüter, A. D., Ullner, M., & Borkovec, M. (2016). The persistence length of adsorbed dendronized polymers. Nanoscale, 8(27), 13498-506. https://doi.org/10.1039/c6nr02665f

CBE

Grebikova L, Kozhuharov S, Maroni P, Mikhaylov A, Dietler G, Schlüter AD, Ullner M, Borkovec M. 2016. The persistence length of adsorbed dendronized polymers. Nanoscale. 8(27):13498-506. https://doi.org/10.1039/c6nr02665f

MLA

Vancouver

Grebikova L, Kozhuharov S, Maroni P, Mikhaylov A, Dietler G, Schlüter AD et al. The persistence length of adsorbed dendronized polymers. Nanoscale. 2016 jul 21;8(27):13498-506. https://doi.org/10.1039/c6nr02665f

Author

Grebikova, Lucie ; Kozhuharov, Svilen ; Maroni, Plinio ; Mikhaylov, Andrey ; Dietler, Giovanni ; Schlüter, A Dieter ; Ullner, Magnus ; Borkovec, Michal. / The persistence length of adsorbed dendronized polymers. I: Nanoscale. 2016 ; Vol. 8, Nr. 27. s. 13498-506.

RIS

TY - JOUR

T1 - The persistence length of adsorbed dendronized polymers

AU - Grebikova, Lucie

AU - Kozhuharov, Svilen

AU - Maroni, Plinio

AU - Mikhaylov, Andrey

AU - Dietler, Giovanni

AU - Schlüter, A Dieter

AU - Ullner, Magnus

AU - Borkovec, Michal

PY - 2016/7/21

Y1 - 2016/7/21

N2 - The persistence length of cationic dendronized polymers adsorbed onto oppositely charged substrates was studied by atomic force microscopy (AFM) and quantitative image analysis. One can find that a decrease in the ionic strength leads to an increase of the persistence length, but the nature of the substrate and of the generation of the side dendrons influence the persistence length substantially. The strongest effects as the ionic strength is being changed are observed for the fourth generation polymer adsorbed on mica, which is a hydrophilic and highly charged substrate. However, the observed dependence on the ionic strength is much weaker than the one predicted by the Odijk, Skolnik, and Fixman (OSF) theory for semi-flexible chains. Low-generation polymers show a variation with the ionic strength that resembles the one observed for simple and flexible polyelectrolytes in solution. For high-generation polymers, this dependence is weaker. Similar dependencies are found for silica and gold substrates. The observed behavior is probably caused by different extents of screening of the charged groups, which is modified by the polymer generation, and to a lesser extent, the nature of the substrate. For highly ordered pyrolytic graphite (HOPG), which is a hydrophobic and weakly charged substrate, the electrostatic contribution to the persistence length is much smaller. In the latter case, we suspect that specific interactions between the polymer and the substrate also play an important role.

AB - The persistence length of cationic dendronized polymers adsorbed onto oppositely charged substrates was studied by atomic force microscopy (AFM) and quantitative image analysis. One can find that a decrease in the ionic strength leads to an increase of the persistence length, but the nature of the substrate and of the generation of the side dendrons influence the persistence length substantially. The strongest effects as the ionic strength is being changed are observed for the fourth generation polymer adsorbed on mica, which is a hydrophilic and highly charged substrate. However, the observed dependence on the ionic strength is much weaker than the one predicted by the Odijk, Skolnik, and Fixman (OSF) theory for semi-flexible chains. Low-generation polymers show a variation with the ionic strength that resembles the one observed for simple and flexible polyelectrolytes in solution. For high-generation polymers, this dependence is weaker. Similar dependencies are found for silica and gold substrates. The observed behavior is probably caused by different extents of screening of the charged groups, which is modified by the polymer generation, and to a lesser extent, the nature of the substrate. For highly ordered pyrolytic graphite (HOPG), which is a hydrophobic and weakly charged substrate, the electrostatic contribution to the persistence length is much smaller. In the latter case, we suspect that specific interactions between the polymer and the substrate also play an important role.

KW - Journal Article

U2 - 10.1039/c6nr02665f

DO - 10.1039/c6nr02665f

M3 - Article

C2 - 27353115

VL - 8

SP - 13498

EP - 13506

JO - Nanoscale

JF - Nanoscale

SN - 2040-3372

IS - 27

ER -