Kinetics and Mechanism of Cationic Surfactant Adsorption and Coadsorption with Cationic Polyelectrolytes at the Silica−Water Interface

Pagac, Edward S.; Prieve, Dennis C.; Tilton, Robert D.

doi:10.1021/la971308f

Cited by 133 publications

(167 citation statements)

References 39 publications

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“…2a and 2b show the adsorbed amounts as a function of time for SDS/PTEA11K-b-PAM30K system on anionically charged silica and polystyrene substrates, respectively. For both surfaces, adsorption occurred at a level (1.2 mg m -2 at steady state) which was consistent with results obtained on electrostatic coacervate phases [23][24][25]. Upon rinsing (second period of the time traces), the reflectometry signal was found to drop significantly in both cases, although for silica the final amount lied higher that for poly(styrene).…”

supporting

confidence: 88%

Stability and Adsorption Properties of Electrostatic Complexes: Design of Hybrid Nanostructures for Coating Applications

Qi¹,

Chapel²,

Castaing³

et al. 2007

Langmuir

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We report the presence of a correlation between the bulk and interfacial properties of electrostatic coacervate complexes. Complexes were obtained by co-assembly between cationic-neutral diblocks and oppositely charged surfactant micelles or 7 nm cerium oxide nanoparticles. Light scattering and reflectometry measurements revealed that the hybrid nanoparticle aggregates were more stable both through dilution and rinsing (from either a polystyrene or a silica surfaces) than their surfactant counterparts. These findings were attributed to a marked difference in critical association concentration between the two systems and to the frozen state of the hybrid structures.The design of functional molecular architectures and materials has attracted much attention during the last decade. In particular, the controlled association of polymers and nanoparticles using covalent [1][2][3] and noncovalent [4][5][6] binding has appeared as a promising way to combine organic and inorganic moieties at a nanoscospic level. The development of hybrid nanostructures was also stimulated by industrial and biomedical applications, especially by applications in the realm of coating technologies. In order to modify the surface properties of materials, inorganic nanoparticles with unique physical features (such as magnetic, fluorescent, UV-absorbent, high dielectric constant or catalytic properties) are actually crucial ingredients. In association with macromolecules, these nanoparticles could be also used for coatings with improved stability and performances (wetting, antibiofouling).In 2004, Cohen Stuart and coworkers have shown that electrostatic complexes made from oppositely charged polyelectrolytes could be effectively adsorbed on hydrophilic and hydrophobic surfaces [7][8][9]. Experiments were conducted at the liquid-solid interfaces on electrostatic core-shell complexes resulting from the selfassembly of an anionic-neutral copolymer and a short cationic homopolymer. On silica and polystyrene substrates, it was found that the cores of the aggregates adsorbed on the surface whereas the shell formed a brush on the top of it. These authors also confirmed the stability of the deposited layer upon rinsing and its repellent effect with respect to proteins [7]. The approach followed in the present communication aimed to extend these measurements to two new types of electrostatic systems, namely to organic and hybrids coacervate complexes. Here, we show the existence of a correlation between the bulk and adsorption properties of surfactant/copolymer (organic) and nanoparticle/copolymer (hybrid) complexes. Using Stagnation Point Adsorption Reflectometry (SPAR), organic and hybrid complexes were found to adsorb readily on hydrophilic and hydrophobic substrates. However, upon rinsing the organic complexes were shown to disassemble and finally desorb from the solid surface, whereas the hybrids remained. These findings were interpreted in terms of a critical association concentration which is much higher for organic systems than for the hybrids.Fo...

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supporting

confidence: 88%

Stability and Adsorption Properties of Electrostatic Complexes: Design of Hybrid Nanostructures for Coating Applications

Qi¹,

Chapel²,

Castaing³

et al. 2007

Langmuir

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“…Adsorptions on the same substrates of electrostatic coacervate phases, e.g. obtained with surfactants and polyelectrolytes were also reported recently [36][37][38]. These studies have revealed interesting co-adsorption features and non equilibrium behaviors at the liquid-solid interfaces.…”

supporting

confidence: 54%

Organic versus hybrid coacervate complexes: co-assembly and adsorption properties

Qi¹,

Chapel²,

Castaing³

et al. 2008

Soft Matter

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We report the co-assembly and adsorption properties of coacervate complexes made from polyelectrolyte-neutral block copolymers and oppositely charged nanocolloids. The nanocolloids put under scrutiny were ionic surfactant micelles and highly charged 7 nm cerium oxide (CeO2) nanoparticles. Static and dynamic light scattering was used to investigate the microstructure and stability of the organic and hybrid complexes. For five different systems of nanocolloids and polymers, we first demonstrated that the electrostatic complexation resulted in the formation of stable core-shell aggregates in the 100 nm range. The microstructure of the CeO2-based complexes was resolved using cryogenic transmission electronic microscopy (Cryo-TEM), and it revealed that the cores were clusters made from densely packed nanoparticles, presumably through complexation of the polyelectrolyte blocks by the surface charges. The cluster stability was monitored by systematic light scattering measurements. In the concentration range of interest, c = 10 -4 -1 wt. %, the surfactant-based complexes were shown to exhibit a critical association concentration (cac) whereas the nanoparticle-polymer hybrids did not. The adsorption properties of the same complexes were investigated above the cac by stagnation point adsorption reflectometry. The adsorbed amount was measured as a function of time for polymers and complexes using anionically charged silica and hydrophobic poly(styrene) substrates. It was found that all complexes adsorbed readily on both types of substrates up to a level of 1 -2 mg m -2 at stationary state. Upon rinsing however, the adsorbed layer was removed for the surfactant-based systems, but not for the cerium oxide clusters. As for the solution properties, these finding were interpreted in terms of a critical association concentrations which are very different for organic and hybrid complexes. Combining the efficient adsorption and strong stability of the CeO2-based core-shell hybrids on various substrates, it is finally suggested that these systems could be used appropriately for coating and anti-biofouling applications. I -IntroductionDevelopment of functional molecular architectures is one of the final goals of modern chemistry, biology and physics. For the design of artificially intelligent devices, fabrication and control of materials at nanometer scale with chemical and physical attributes has been attracting much attention in the last decade. In particular, the complexation of polymers and nanoparticles is opening pathways for engineering novel hybrid structures combining the advantageous properties of both the organic and inorganic moieties [1][2][3]. The first challenge of the present paper was the design of nano-objects with new functionalities and resulting from the association between nanocolloids and polymers. The nanocolloids put under scrutiny were of two kinds: surfactant micelles and inorganic cerium oxide nanoparticles. As for polymers, polyelectrolyte-neutral block copolymers also called double-hydrophilic copolymer...

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“…When the concentration exceeds the stc, surfactant aggregates with a local bilayer structure may be observed [35][36][37]. Assuming adsorption occurs mostly in the first and second layers and using Eqs.…”

Section: Derivation Of the Bilayer Isothermmentioning

confidence: 99%

Adsorption of triton X-100 on silica gel: effects of temperature and alcohols

Samiey

Golestan

2010

Open Chemistry

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Adsorption of Triton X-100 (TX-100) on silica gel has been studied as a function of temperature (308-328 K) and composition for mixtures of water with ethanol or t-butanol. The adsorption capacity of silica gel for TX-100 decreases with increase in alcohol content. Adsorption isotherms of TX-100 on silica gel are four-region and were analyzed using the ARIAN (adsorption isotherm regional analysis) model. Data in regions 2, 3 and 4 were fitted to the Temkin, bilayer and reverse desorption isotherms, respectively. The results show that adsorption of TX-100 on silica gel in water and alcohol-water binary mixtures occurs mainly through formation of monolayer surface aggregates or low bilayer coverage. © Versita Sp. z o.o.

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Kinetics and Mechanism of Cationic Surfactant Adsorption and Coadsorption with Cationic Polyelectrolytes at the Silica−Water Interface

Cited by 133 publications

References 39 publications

Stability and Adsorption Properties of Electrostatic Complexes: Design of Hybrid Nanostructures for Coating Applications

Stability and Adsorption Properties of Electrostatic Complexes: Design of Hybrid Nanostructures for Coating Applications

Organic versus hybrid coacervate complexes: co-assembly and adsorption properties

Adsorption of triton X-100 on silica gel: effects of temperature and alcohols

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