Neutron scattering study of water-soluble polymers adsorbed on surfactant micelles

Cabane, Bernard; Duplessix, R.

doi:10.1016/0166-6622(85)80003-2

Cited by 166 publications

(143 citation statements)

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“…A similar crossover occurs at the same composition in dilute solutions [3,4] : there as well, an abrupt saturation of the polymer is observed when x/y decreases below a stoichiometric value ; the micelles which cannot be accommodated on the dwindling number of macromolecules are spilled over in the solution where they coexist with the bound micelles.…”

mentioning

confidence: 76%

“…Then the spacings of micelles in a necklace reach their lower limit, which can be estimated from the position of the subsidiary (intra-necklace) peak observed for SDS at the bottom of region B : we find 85 A for solutions with no added salt (Fig. 13), and 60 A at high ionic strength [3,4].…”

mentioning

confidence: 99%

“…Still [19] ; consequently the pair correlation function of all monomers is damped by a factor e-rlt where the screening length t is equal to 0.35 gb [20]. The structure factor of the whole web has the form : Figure 3 shows the intensities scattered by semidilute PEO solutions, plotted according to equation (4 [3].…”

mentioning

confidence: 99%

“…The elementary step of the binding wraps 'a section of a macromolecule around a micelle [2,3] ; if the macromolecule is long enough it can clothe many micelles connected by free strands (Fig. 1), resulting in a « necklace » which may contain up to 300 micelles [4]. Here [14,32].…”

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Decoration of semidilute polymer solutions with surfactant micelles

1987

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confidence: 76%

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confidence: 99%

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Decoration of semidilute polymer solutions with surfactant micelles

1987

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“…In some studies the micelle size is concluded to be independent of the degree of complexation, in other a dependence is found [21,[30][31][32]. In the case of complexing colloidal particles (proteins) the dimensions of the particles are similar to those of adsorbed micelles and constant.…”

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confidence: 93%

Stuffed brushes: theory and experiment

Currie¹,

Gucht²,

Borisov³

et al. 1999

Pure and Applied Chemistry

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Abstract:The interaction between polymer brushes and mesoscopic particles is investigated both theoretically and experimentally. We present an analytical mean-field theory for a polymer brush (a layer of long polymer chains end-grafted to a substrate) with varying excluded volume interactions between monomer units. This system mimics the reversible adsorption of mesoscopic particles, such as surfactant micelles or proteins, on the grafted chains. The equilibrium structural properties of the brush (the brush thickness and overall degree of complexation) as well as the number of adsorbed particles per unit area, ⌫, are analysed as functions of the affinity between particle and chain, grafting density and excluded volume interactions. In our model ⌫ is found to have a maximum as a function of . Experimentally the adsorption of BSA on a hydrophobic substrate with grafted PEO chains is measured with reflectometry. In the case of short grafted chains the adsorbed amount of BSA, ⌫, decreases continuously with increasing , which agrees with previous results and model calculations in the literature. In the case of long PEO chains, however, ⌫ is found to have a maximum as a function of . Qualitatively the experimental dependence of ⌫ on is found to agree with the results of our mean-field model. PEO chains show no affinity for BSA in the bulk, whereas in a grafted conformation an effective attraction is found. Some comments are made on the nature of this affinity, which is not yet fully understood.

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Interaction between small colloidal particles and molecular chains with selectively adsorbing groups: computer simulation study

Khalatur¹,

Kovalenko

Khokhlov

1999

Macromol. Theory Simul.

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SUMMARY: Using the Monte Carlo simulation technique and the method of simulated annealing, we study interactions between small (nanometric) particles and flexible-chain polymers with sticker groups which selectively adsorb on the particles and also can strongly attract each other. For the chains with two end stickers (telechelic polymers), we find that the colloidal particles adsorbing on the polymers play the role of junction points (locks) which bind together the ends of different chains. This direct or indirect binding leads to the formation of a web-like structure throughout the sample: colloidal particles and chain stickers group into mixed clusters -"drops of a fog" -which are wrapped by polymer chains and connected by bridges. Analyzing static structure factors, we show that the selectively adsorbing telechelic polymers can affect the equilibrium spatially homogeneous distribution of colloidal particles that results in the appearance of a quasiregular structure on the intermediate scale related to the average intercluster distance. At sufficiently strong attraction between particles and chain end-groups, most of the telechelic chains (A90%) adopt either a looplike or a stretched bridge-like conformation, the most typical morphology of the system being a combination of these two structural elements. In the mixed clusters, the colloidal particles and the chain ends pack locally on a binary grid corresponding to a local crystal-like arrangement. For the chains without attracting endgroups, we observe the formation of elongated, rugby-ball-like clusters having alternate layers of particles and adsorbing chain groups.

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Neutron scattering study of water-soluble polymers adsorbed on surfactant micelles

Cited by 166 publications

References 13 publications

Decoration of semidilute polymer solutions with surfactant micelles

Decoration of semidilute polymer solutions with surfactant micelles

Stuffed brushes: theory and experiment

Interaction between small colloidal particles and molecular chains with selectively adsorbing groups: computer simulation study

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