Bottle-brush polymers: Adsorption at surfaces and interactions with surfactants

Claesson, Per M.; Makuška, Ričardas; Varga, Imre; Mészáros, Róbert; Titmuss, Simon; Linse, Per; Pedersen, Jan Skov

doi:10.1016/j.cis.2010.01.004

Cited by 34 publications

(18 citation statements)

References 31 publications

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“…Figure 4 shows the surface tension isotherms of SO and SDBS in the presence of iron oxide nanoparticle suspensions at pH = 10. In solutions of polymers and surfactants, these types of surface tension isotherms are used to evaluate the binding of surfactants to polymers [24]. Here, these isotherms are useful to assess the adsorption of SO and SDBS to iron oxide nanoparticles.…”

Section: Surface Activity Of So and Sdbsmentioning

confidence: 99%

Suspensions of Iron Oxide Nanoparticles Stabilized by Anionic Surfactants

Wang

Lam

Acosta

2013

J Surfact & Detergents

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Two common anionic surfactants, sodium oleate (SO) and sodium dodecyl benzene sulfonate (SDBS) were used to re-suspend iron oxide nanoparticles in aqueous solutions. At certain SO concentrations, the SO formulations produced highly stable suspensions. In contrast, SDBS-stabilized nanoparticles exhibited poor stability at all concentrations. The adsorption isotherm of SO on iron oxide nanoparticles revealed that stable suspensions were obtained when the equilibrium SO concentration (after adsorption) reached its critical micelle concentration (CMC). At this ''optimal'' condition, the maximum SO adsorption was reached, and the zeta-potential of the particles was highly negative (* -50 mV). According to the SO isotherm, this optimal formulation coincided with the formation of a highly compact SO bilayer. The SDBS isotherm, on the other hand, revealed that SDBS is not strongly adsorbed on the surface of iron oxide nanoparticles and that is likely that a patchy, loosely packed bilayer, is formed on the surface of the iron oxide nanoparticles when the equilibrium SDBS concentration reaches its CMC. The DLVO theory confirmed the connection between formulation conditions and the corresponding stability. This works confirmed that the formation of a surfactant bilayer is an important element in producing stable nanoparticle suspensions with anionic surfactants. It was also confirmed that for anionic surfactants, electrostatic repulsions are an important factor in establishing an energy barrier against flocculation. This work also introduced two more elements into the design of nanoparticle suspensions. The first element is that, in order to ensure the best possible dispersion, the surfactant concentration in solution at equilibrium with the adsorbed surfactant should be close or slightly above its CMC. The second element is that the molecular structure of the surfactant should facilitate the formation of closely packed bilayers.

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Section: Surface Activity Of So and Sdbsmentioning

confidence: 99%

Suspensions of Iron Oxide Nanoparticles Stabilized by Anionic Surfactants

Wang

Lam

Acosta

2013

J Surfact & Detergents

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“…For stabilization of metal oxide dispersions, including TiO 2 , de Hazan et al were using anionic comb polyelectrolytes containing units of poly(ethylene oxide) methacrylate and acrylic acid 42,45,46 . Claesson et al studied the effects of side chains and charge density on adsorption of cationic comb polyelectrolytes on flat surfaces such as mica and silica [47][48][49][50][51][52] . It was shown that the adsorbed layers of comb polyelectrolytes significantly reduced friction between coated surfaces and protected them from adhesion of proteins [53][54][55] .…”

Section: Introductionmentioning

confidence: 99%

Effect of Structure of Cationic Comb Copolymers on Their Adsorption and Stabilization of Titania Nanoparticles

2015

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Cationic linear polymer poly([2-(methacryloyloxy)ethyl] trimethylammonium chloride) p(METAC), neutral brush polymer poly(poly(ethylene glycol) methyl ether methacrylate) p(PEO22MEMA), and cationic comb copolymers p(METAC-PEO(x)MEMA) were used for the stabilization of titania dispersions under neutral and alkaline conditions. Random comb copolymers p(METAC-PEO(x)MEMA) differing in charge density and length of PEO side chains were synthesized by RAFT. The adsorption of cationic polymers on titania nanoparticles was evaluated by thermogravimetric analysis; changes in surface potential, by measuring the zeta potential; and the stability of the treated TiO2 dispersions, by laser diffraction and DLS. Cationic linear and comb copolymers containing relatively short PEO side chains promoted the inversion of nanoparticle surface potential from strongly negative (-60 mV) to moderately positive (10-35 mV). Cationic comb copolymers containing longer PEO side chains increased the zeta potential of the treated nanoparticles but did not invert it to positive. Aqueous dispersions of titania nanoparticles stabilized by cationic comb copolymers under alkaline conditions (pH 10) were dispersed by high-energy planetary ball milling up to a primary particle size of 20 nm and were stable for at least 2 days.

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“…To ensure lubrication under severe working conditions such as boundary lubrication condition, anchoring groups must be designed to interact strongly with the surface they are meant to protect. Different types of anchoring groups have been probed making use of a large variety of molecular interactions such as electrostatic interactions using poly(L-Lysine) 40 , 2-methacryloyloxyethyl trimethyl ammonium chloride [41][42] or quaternized 2-(dimethylaminoethyl) methacrylate 5 , as well as hydrophobic interactions 38 , or covalent bounding. 7 Many structural parameters of BB polymers can be varied to optimize their lubricating properties.…”

Section: Introductionmentioning

confidence: 99%

Intermolecular Interactions between Bottlebrush Polymers Boost the Protection of Surfaces against Frictional Wear

et al. 2018

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Polymers exhibiting the bottlebrush (BB) architecture have excellent lubricating properties. However, in order to motivate their use in real life systems, they must also protect surfaces against frictional damage. In this article, we synthesized a library of polyzwiterrionic bottlebrush polymers of different architectures to explore the effect of intermolecular interactions on their conformation at interfaces and their tribological properties. Using the surface forces apparatus, we show that increasing the number of adhesives blocks on the BB polymers does not impact the friction coefficient on mica surfaces, µ, which remained close to µ = 0.02 but drastically increased the threshold pressure, P*, at which wear initiates from P* = 0.4 ± 0.1 MPa up to P* = 8.0 ± 0.8 MPa. In mixtures of high molecular weight hyaluronic acid (HA) and BB polymers, a synergistic interaction between polymers occurred leading to a significant increase of P*, independently of the BB polymer tested and even reaching superprotection for strongly interacting polymers (up to P* > 14 MPa). Overall, these results show that strong intermolecular interaction between BB polymers and high molecular weight linear polymers is a promising strategy to create highly-protective lubricants.

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Bottle-brush polymers: Adsorption at surfaces and interactions with surfactants

Cited by 34 publications

References 31 publications

Suspensions of Iron Oxide Nanoparticles Stabilized by Anionic Surfactants

Suspensions of Iron Oxide Nanoparticles Stabilized by Anionic Surfactants

Effect of Structure of Cationic Comb Copolymers on Their Adsorption and Stabilization of Titania Nanoparticles

Intermolecular Interactions between Bottlebrush Polymers Boost the Protection of Surfaces against Frictional Wear

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