Interactions of PAMAM Dendrimers with SDS at the Solid-Liquid Interface
(2013) In Langmuir 29(19). p.5817-5831- Abstract
- This work addresses structural and nonequilibrium effects of the interactions between well-defined cationic poly(amidoamine) PAMAM dendrimers of generations 4 and 8 and the anionic surfactant sodium dodecyl sulfate (SDS) at the hydrophilic silica-water interface. Neutron reflectometry and quartz crystal microbalance with dissipation monitoring were used to reveal the adsorption from premixed dendrimer/surfactant solutions as well as sequential addition of the surfactant to preadsorbed layers of dendrimers. PAMAM dendrimers of both generations adsorb to hydrophilic silica as a compact monolayer, and the adsorption is irreversible upon rinsing with salt solution. SDS adsorbs on the dendrimer layer and at low bulk concentrations causes the... (More)
- This work addresses structural and nonequilibrium effects of the interactions between well-defined cationic poly(amidoamine) PAMAM dendrimers of generations 4 and 8 and the anionic surfactant sodium dodecyl sulfate (SDS) at the hydrophilic silica-water interface. Neutron reflectometry and quartz crystal microbalance with dissipation monitoring were used to reveal the adsorption from premixed dendrimer/surfactant solutions as well as sequential addition of the surfactant to preadsorbed layers of dendrimers. PAMAM dendrimers of both generations adsorb to hydrophilic silica as a compact monolayer, and the adsorption is irreversible upon rinsing with salt solution. SDS adsorbs on the dendrimer layer and at low bulk concentrations causes the expansion of the dendrimer layers on the surface. When the bulk concentration of SDS is increased, the surfactant layer consists of aggregates or bilayer-like structures The adsorption of surfactant is reversible upon rinsing, but slight changes of the structure of the preadsorbed PAMAM monolayer were observed The adsorption from premixed solutions close to charge neutrality results in thick multilayers, but the surface excess is lower when the bulk complexes have a net negative charge. A critical examination of the pathway of adsorption for the interactions of SDS with preadsorbed PAMAM monolayers and premixed PAMAM/SDS solutions with hydrophilic silica revealed that nonequilibrium effects are important only in the latter case, and the application of a thermodynamic model to such experimental data would be inappropriate. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/3932208
- author
- Yanez, Marianna LU ; Eltes, Felix LU ; Campbell, Richard A. and Nylander, Tommy LU
- organization
- publishing date
- 2013
- type
- Contribution to journal
- publication status
- published
- subject
- in
- Langmuir
- volume
- 29
- issue
- 19
- pages
- 5817 - 5831
- publisher
- The American Chemical Society (ACS)
- external identifiers
-
- wos:000319185100020
- scopus:84877740840
- ISSN
- 0743-7463
- DOI
- 10.1021/la400774p
- language
- English
- LU publication?
- yes
- id
- e1cf277b-c116-4951-b2a4-9111c2003b25 (old id 3932208)
- date added to LUP
- 2016-04-01 09:49:26
- date last changed
- 2023-08-30 10:45:00
@article{e1cf277b-c116-4951-b2a4-9111c2003b25,
abstract = {{This work addresses structural and nonequilibrium effects of the interactions between well-defined cationic poly(amidoamine) PAMAM dendrimers of generations 4 and 8 and the anionic surfactant sodium dodecyl sulfate (SDS) at the hydrophilic silica-water interface. Neutron reflectometry and quartz crystal microbalance with dissipation monitoring were used to reveal the adsorption from premixed dendrimer/surfactant solutions as well as sequential addition of the surfactant to preadsorbed layers of dendrimers. PAMAM dendrimers of both generations adsorb to hydrophilic silica as a compact monolayer, and the adsorption is irreversible upon rinsing with salt solution. SDS adsorbs on the dendrimer layer and at low bulk concentrations causes the expansion of the dendrimer layers on the surface. When the bulk concentration of SDS is increased, the surfactant layer consists of aggregates or bilayer-like structures The adsorption of surfactant is reversible upon rinsing, but slight changes of the structure of the preadsorbed PAMAM monolayer were observed The adsorption from premixed solutions close to charge neutrality results in thick multilayers, but the surface excess is lower when the bulk complexes have a net negative charge. A critical examination of the pathway of adsorption for the interactions of SDS with preadsorbed PAMAM monolayers and premixed PAMAM/SDS solutions with hydrophilic silica revealed that nonequilibrium effects are important only in the latter case, and the application of a thermodynamic model to such experimental data would be inappropriate.}},
author = {{Yanez, Marianna and Eltes, Felix and Campbell, Richard A. and Nylander, Tommy}},
issn = {{0743-7463}},
language = {{eng}},
number = {{19}},
pages = {{5817--5831}},
publisher = {{The American Chemical Society (ACS)}},
series = {{Langmuir}},
title = {{Interactions of PAMAM Dendrimers with SDS at the Solid-Liquid Interface}},
url = {{http://dx.doi.org/10.1021/la400774p}},
doi = {{10.1021/la400774p}},
volume = {{29}},
year = {{2013}},
}