Forces between surfaces bearing terminally anchored polymer chains in good solvents

Taunton, Hillary J.; Toprakcioglu, Chris; Fetters, Lewis J.; Klein, Jacob

doi:10.1038/332712a0

Cited by 284 publications

(247 citation statements)

References 11 publications

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“…The simple scaling calculation predicts the brush height h correctly in the asymptotic limit of long chains and strong overlap. It has been confirmed by experiments [9,8,11] and computer simulations [46,47].…”

Section: Scaling Approachsupporting

confidence: 58%

“…The understanding of grafted polymer systems progressed substantially with the advent of experimental techniques such as: surface-force-balance [8], small-angle-neutron scattering [9], neutron [11,25] and X-ray [26] diffraction, and ellipsometry [14]. Of equal merit was the advancement in the theoretical methodology ranging from field theoretical methods and scaling arguments to numerical simulations, which will be amply reviewed in this chapter.…”

mentioning

confidence: 99%

“…This grafting-to procedure is subject to slow kinetics during the formation stage since whole polymers have to diffuse through the natant grafting layer, but benefits from a somewhat better control over the brush constitution and chemical composition. One distinguishes physical adsorption of end-groups that favor the substrate, for example zwitter-ionic endgroups attached to poly-styrene chains that lead to binding to mica in organic solvents such as toluene or xylene [8]. A stronger and thus more stable attachment is possible with covalently end-grafted chains, for example poly-dimethylsiloxane chains which carry hydroxyl end groups and undergo condensation reactions with silanols of a silica surface [9].…”

mentioning

confidence: 99%

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Theoretical Approaches to Neutral and Charged Polymer Brushes

Naji

Seidel

Netz

Advances in Polymer Science

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Neutral or charged polymers that are densely end-grafted to surfaces form brushlike structures and are highly stretched under good-solvent conditions. We discuss and compare relevant results from scaling models, self-consistent-field methods and MD simulation techniques and concentrate on the conceptual simple case of planar substrates. For neutral polymers the main quantity of interest is the brush height and the polymer density profile, which can be well predicted from self-consistent calculations and simulations. Charged polymers (polyelectrolytes) are of practical importance since they are soluble in water. Counterion degrees of freedom determine the brush behavior in a decisive way and lead to a strong and non-linear swelling of the brush.

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Section: Scaling Approachsupporting

confidence: 58%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Theoretical Approaches to Neutral and Charged Polymer Brushes

Naji

Seidel

Netz

Advances in Polymer Science

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“…Despite the complexity of the underlying physics, the effective behavior of the adhesive layer is generally characterized by moderate range attractive interactions and short-range repulsive interactions (Israelachvilli, 1985;Maugis, 2000). Examples include the interactions between mica surfaces (Israelachvili and Tabor, 1972), polymer layers in solvent (Klein, 1982;Taunton et al, 1988), and the interactions of receptor-ligand systems (Leckband et al, 1992;Leckband et al, 1994;Wong et al, 1997). These general observations are captured by adopting a simple and classical description of the adhesive potential that is derived from Lennard-Jones interactions.…”

Section: The Adhesive Lawmentioning

confidence: 99%

Snap transitions in adhesion

Springman

Bassani

2008

Journal of the Mechanics and Physics of Solids

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Equilibrium adhesion states are analyzed for nonlinear spherical caps adhered to a rigid substrate under the influence of adhesive tractions that depend on the local separation between the shell and substrate. Transitions between bistable snapped-in and snapped-out configurations are predicted as a function of four nondimensional parameters representing the adhesive energy, the undeformed shell curvature, the range of the adhesive interactions, and the magnitude of an externally applied load. Nonuniform energy and traction fields associated with free-edge boundary conditions are calculated to better understand localized phenomena such as the diffusion of impurities into a bonded interface and the diffusion of receptors in the cell membrane. The linear Griffith approximations commonly used in the literature are shown to be limited to shells with a small height to thickness ratio and short-range adhesive interactions. External loading is found to alter the adhered configurations and the spatial distributions of both adhesive and elastic energies. An important implication of the latter analysis is the theoretical prediction of the pull-off force, which is shown to depend not only on the interface properties, but also on the geometric and material parameters of the shell and on both the magnitude and type of external loading. AbstractEquilibrium adhesion states are analyzed for nonlinear spherical caps adhered to a rigid substrate under the influence of adhesive tractions that depend on the local separation between the shell and substrate. Transitions between bistable snapped-in and snapped-out configurations are predicted as a function of four nondimensional parameters representing the adhesive energy, the undeformed shell curvature, the range of the adhesive interactions, and the magnitude of an externally applied load. Non-uniform energy and traction fields associated with free-edge boundary conditions are calculated to better understand localized phenomena such as the diffusion of impurities into a bonded interface and the diffusion of receptors in the cell membrane. The linear Griffith approximations commonly used in the literature are shown to be limited to shells with a small height to thickness ratio and short-range adhesive interactions. External loading is shown to alter the adhered configurations and the spatial distributions of both adhesive and elastic energies. An important implication of the latter analysis is the theoretical prediction of the pull-off force, which is shown to depend not only on the interface properties, but also on the geometric and material parameters of the shell and on both the magnitude and type of external loading.

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“…Many molecules such as dihydroxyphenylalanine, poly(N-isopropyl acrylamide), dextran, polyacrylamide [128][129][130] are capable of resisting to cell or protein adhesion. Surface-bound PEG or PEO is a common strategy for retarding the nonspecific adsorption of proteins and other biological species such as cells [131]. PEG is an uncharged and nontoxic polymer.…”

Section: Adsorption-resistant Surfaces and Samsmentioning

confidence: 99%

Surface treatment and characterization: Perspectives to electrophoresis and lab‐on‐chips

et al. 2006

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The control and modification of surface state is a major challenge in bioanalytical sciences, and in particular in electrokinetic separation methods, due to the importance of electroosmosis. This topic has gained recently a renewed interest, associated with the development of "lab-on-chips" systems that extend the range of materials in which separation channels are fabricated. The surface science community has developed through the years a large toolbox of characterization tools and surface modification protocols, which is not yet fully exploited in the bioanalytical world. In this paper, we try and present an overview of these tools, in order to stimulate new ideas for improved and more controlled surface treatment strategies for separations in capillaries and microchannels. We briefly describe some physical and chemical aspects of electroosmosis (global and spatially resolved), streaming current, and streaming potential. We also review the main strategies for surface coating, and compare the advantages of physisorption, well-organized thin self-assembled monolayers, or conversely thick polymer "brushes". Examples of existing applications to electrophoresis in microchannel are also given.

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Forces between surfaces bearing terminally anchored polymer chains in good solvents

Cited by 284 publications

References 11 publications

Theoretical Approaches to Neutral and Charged Polymer Brushes

Theoretical Approaches to Neutral and Charged Polymer Brushes

Snap transitions in adhesion

Surface treatment and characterization: Perspectives to electrophoresis and lab‐on‐chips

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