Adsorption of Sodium Dodecyl Sulfate to a Polystyrene/Water Interface Studied by Neutron Reflection and Attenuated Total Reflection Infrared Spectroscopy

Turner, Susan; Clarke, Stuart M.; Rennie, Adrian R.; Thirtle, P. N.; Cooke, D. J.; Li, Z. X.; Thomas, Robert K.

doi:10.1021/la980199h

Cited by 72 publications

(78 citation statements)

References 18 publications

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“…For silica surfaces, it is plausible that the cationic PTEA blocks adsorb onto the oppositely charged substrate, leading to a finite adsorbed amount even at long times. In the case of PS, both SDS surfactants and PTEA11K-b-PAM30K may remain simultaneously [58].…”

Section: Iii22 -Organic Coacervatesmentioning

confidence: 99%

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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Section: Iii22 -Organic Coacervatesmentioning

confidence: 99%

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

Qi¹,

Chapel²,

Castaing³

et al. 2008

Soft Matter

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“…Zwetsloot and Leyte [5] obtained the adsorption isotherm of SDS on PS latex using conductivity measurements by solving the Poisson-Boltzmann equation. Turner et al [6] have studied the adsorption isotherm of SDS on PS thin films by neutron reflection and attenuated total reflection infrared spectroscopy. Jadir-Reyes et al [7] have studied the adsorption of different amphiphilic molecules onto PS latex particles by means of a depletion method and spectrophotometric techniques.…”

mentioning

confidence: 99%

A New Method for Determination of the Adsorption Isotherm of SDS on Polystyrene Latex Particles Using Conductometric Titrations

et al. 2007

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Monodisperse polystyrene (PS) latex particles were prepared through a conventional batch emulsion polymerization procedure. After cleaning, the latex was subjected to a surfactant titration by sodium dodecyl sulfate (SDS) and the conductivity was monitored. Using the break point in the conductivity-concentration curve, the adsorption area of the surfactant molecules at saturation, A s , was determined as 46 Å 2 per SDS molecule. In order to determine the contribution of the different ionic species to the conductivity, a simple model based on experimental conductivity measurements was developed. The degrees of counterion binding to the micelles and to the surfactant anions adsorbed onto polymer particles were calculated as 0.770 and 0.849, respectively. The Langmuir adsorption isotherm was determined for the adsorption of SDS onto PS latex particles with C ∞ = 7.257 · 10 -10 mol/cm 2 and K = 1.208 · 10 5 cm 3 /mol. IntroductionEmulsion polymerization is an important industrial process for the production of a wide variety of polymers. According to the classical theory of emulsion polymerization, surfactants are responsible for the micellar particle nucleation in the first interval of an ab initio emulsion polymerization. Surfactants also have a crucial role in maintaining the colloidal stability of the latex and in the evolution of the particle size distribution. However, in seeded emulsion polymerizations, e.g., in coreshell systems, the situation is slightly different, because in these systems, it is necessary to use an appropriate amount of surfactant in the reaction recipe to prevent secondary particle nucleation. Therefore, the maximum amount of surfactant used must not exceed the sum of the critical micelle concentration (CMC) and the required amount of surfactant for saturation of the total surface area of the entire particles. In this regard, attention has been paid in the literature to the determination of the adsorption characteristics of surfactants on polymer latex particles, including the adsorption isotherm and adsorption area of surfactant molecules at saturation, A s [1][2][3][4][5][6][7] 1) . Brown and Zhao determined the adsorption isotherm of SDS on clean PS [1] and styrene-butadiene [2] latex particles using surface tension measurements. Lin et al. [3] applied surface tension measurements for the determination of the adsorption isotherm of SDS using unclean PS latex particles. Vale and McKenna [4] reported in detail on the adsorption of SDS and sodium dodecylbenzene sulfonate on polyvinyl chloride latex particles by surface tension measurements. Zwetsloot and Leyte [5] obtained the adsorption isotherm of SDS on PS latex using conductivity measurements by solving the Poisson-Boltzmann equation. Turner et al. [6] have studied the adsorption isotherm of SDS on PS thin films by neutron reflection and attenuated total reflection infrared spectroscopy. Jadir-Reyes et al. [7] have studied the adsorption of different amphiphilic molecules onto PS latex particles by means of a depletion method and spec...

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“…This molecular area is still within monolayer coverage range; however, such molecular area suggests that SDBS molecules at the PVC-water interface are more closely packed than at the ODT-phosphate buffer interface. It is surprising that SDBS is more packed on PVC than ODT surface even though PVC is slightly negatively charged [31]. Additionally, the presence of high concentration of Na + in the case of our study would promote charge screening on the surfactant molecules, which in turn would be expected to produce higher packing than in the case of the PVCwater interface.…”

Section: Sdbs Adsorption At the Odt-liquid Interfacementioning

confidence: 73%

“…PLS carries a net negative charge, and thus SDBS packing on PLS (as it is the case for PVC latex) is expected to be lower than the neutral ODT. Furthermore, Turner et al [31] used neutron Table 2 reflectivity to study the adsorption of SDS on a neutral hydrophobic PS surface (contact angle with water is~90° [33]). The reported molecular area of SDS on PS is 42 Å 2 .…”

Section: Sdbs Adsorption At the Odt-liquid Interfacementioning

confidence: 99%

Adsorption of an anionic surfactant at air-liquid and different solid-liquid interfaces from solutions containing high counter-ion concentration

2015

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The self-assembly (adsorption) of the anionic surfactant, sodium dodecylbenzenesulphonate (SDBS), at airliquid and different (octadecanethiol, β-mercaptoethanol, α-lipoic acid) solid-liquid interfaces from aqueous solutions containing high concentrations of counter-ion has been investigated. SDBS adsorption at the solid-liquid interfaces was obtained using surface plasmon resonance (SPR) while its adsorption at the air-liquid interface was extracted from surface tension measurements. The results have demonstrated that SDBS packing at the air-liquid interface is similar to its packing at the hydrophobic octadecanethiol-liquid interface. Additionally, SDBS packing at the three solid-liquid interfaces increases with increasing surface hydrophobicity, irrespective whether the surface is neutral or negatively charged. Nonetheless, SDBS adsorption is always within monolayer coverage (no evidence of bilayer or admicelle formation). The results have also revealed that SDBS affinity for the solid-liquid interfaces increases with increasing surface hydrophobicity. Furthermore, SDBS affinity for the air-liquid interface is more than 10-fold its affinity for the solid-liquid interfaces.

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Adsorption of Sodium Dodecyl Sulfate to a Polystyrene/Water Interface Studied by Neutron Reflection and Attenuated Total Reflection Infrared Spectroscopy

Cited by 72 publications

References 18 publications

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

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

A New Method for Determination of the Adsorption Isotherm of SDS on Polystyrene Latex Particles Using Conductometric Titrations

Adsorption of an anionic surfactant at air-liquid and different solid-liquid interfaces from solutions containing high counter-ion concentration

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