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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Campbell, Richard A.
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (24/24 displayed)
- 2022Interfacial complexation of a neutral amphiphilic ‘tardigrade’ co-polymer with a cationic surfactant
- 2022Interfacial complexation of a neutral amphiphilic ‘tardigrade’ co-polymer with a cationic surfactant: Transition from synergy to competitioncitations
- 2022Interfacial complexation of a neutral amphiphilic ‘tardigrade’ co-polymer with a cationic surfactant: Transition from synergy to competitioncitations
- 2022Interfacial complexation of a neutral amphiphilic ‘tardigrade’ co-polymer with a cationic surfactant:Transition from synergy to competition
- 2021Tuneable interfacial surfactant aggregates mimic lyotropic phases and facilitate large scale nanopatterningcitations
- 20203D texturing of the air–water interface by biomimetic self-assemblycitations
- 2020Synergy, competition, and the “hanging” polymer layer:Interactions between a neutral amphiphilic ‘tardigrade’ comb co-polymer with an anionic surfactant at the air-water interfacecitations
- 2020Synergy, competition, and the “hanging” polymer layer: Interactions between a neutral amphiphilic ‘tardigrade’ comb co-polymer with an anionic surfactant at the air-water interfacecitations
- 2019Polydopamine layer formation at the liquid – gas interfacecitations
- 2016Smart nanogels at the air/water interfacecitations
- 2016Smart nanogels at the air/water interface:Structural studies by neutron reflectivitycitations
- 2015On the formation of dendrimer/nucleolipids surface films for directed self-assemblycitations
- 2013New method to predict the surface tension of complex synthetic and biological polyelectrolyte/surfactant mixturescitations
- 2011Effects of bulk colloidal stability on adsorption layers of poly(diallyldimethylammonium chloride)/sodium dodecyl sulfate at the air-water interface studied by neutron reflectometrycitations
- 2011Effects of bulk colloidal stability on adsorption layers of poly(diallyldimethylammonium chloride)/sodium dodecyl sulfate at the air-water interface studied by neutron reflectometrycitations
- 2011Effects of Bulk Colloidal Stability on Adsorption Layers of Poly(diallyldimethylammonium Chloride)/Sodium Dodecyl Sulfate at the Air-Water Interface Studied by Neutron Reflectometrycitations
- 2010New perspective on the cliff edge peak in the surface tension of oppositely charged polyelectrolyte/surfactant mixturescitations
- 2010New perspective on the cliff edge peak in the surface tension of oppositely charged polyelectrolyte/surfactant mixturescitations
- 2010New Perspective on the Cliff Edge Peak in the Surface Tension of Oppositely Charged Polyelectrolyte/Surfactant Mixturescitations
- 2008Competitive adsorption of neutral comb polymers and sodium dodecyl sulfate at the air/water interfacecitations
- 2007Dynamics of adsorption of an oppositely charged polymer-surfactant mixture at the air-water interfacecitations
- 2005External reflection fourier transform infrared spectroscopy of surfactants at the air-water interface:Separation of bulk and adsorbed surfactant signalscitations
- 2005External reflection fourier transform infrared spectroscopy of surfactants at the air-water interfacecitations
- 2004External reflection FTIR spectroscopy of the cationic surfactant hexadecyltrimethylammonium bromide (CTAB) on an overflowing cylindercitations
Places of action
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article
Dynamics of adsorption of an oppositely charged polymer-surfactant mixture at the air-water interface
Abstract
<p>The dynamic adsorption behavior of mixtures of the cationic polymer poly(dimethyldiallylammonium chloride) [poly(dmdaac)] and the anionic surfactant sodium dodecyl sulfate (SDS) has been studied at the expanding liquid surface of an overflowing cylinder. A combination of ellipsometry and external reflection Fourier transform infrared spectroscopy was used to measure the adsorbed amounts of poly(dmdaac) and SDS as a function of the bulk surfactant concentration for various polymer concentrations in the range 0-0.2 g dm <sup>-3</sup>. Laser Doppler velocimetry was used to determine the surface age, which was ∼1 s for solutions where the polymer adsorbed. The interfacial behavior is rationalized in terms of competition between surface activity and mass transport to the expanding surface. At low surfactant concentrations, adsorption of both poly(dmdaac) and SDS is enhanced as a result of the formation in solution of polymer-surfactant complexes that are more surface active than either component alone. The rate of adsorption of these complexes is diffusion-controlled, and their interfacial composition remains constant at three dmdaac units per SDS molecule over a 5-fold change in the surfactant concentration. For the higher polymer concentrations studied, the complexes saturate the air-water interface: the adsorbed amount is independent of the polymer concentration and remains constant also over a factor of 5 in the surfactant concentration. Once the number of bound surfactant molecules per dmdaac monomer exceeds 0.3, the complexes begin to form large aggregates, which are not surface active due to their slower mass transport. The adsorbed amount decreases rapidly on approach to the equivalence point (one SDS molecule per dmdaac monomer), and when it is reached, only a very small amount of material remains at the interface. At still higher surfactant concentrations, the free SDS adsorbs but there is no adsorbed poly(dmdaac). The dynamic adsorption data are compared with equilibrium measurements of the same system by Staples et al. (Langmuir 2002, 18, 5147), which show very different surface compositions and no significant change in surface coverage at the equivalence point.</p>