Download Biopolymers at Interfaces, Second Edition (Surfactant by Martin Malmsten PDF

By Martin Malmsten

This new version good points study from approximately 60 of the profession's so much distinctive overseas professionals. spotting rising advancements in biopolymer structures learn with absolutely up to date and increased chapters, the second one variation discusses the biopolymer-based multilayer buildings and their software in biosensors, the growth made within the realizing of protein behaviour on the air-water interface, experimental findings in ellipsometry and reflectometry, and up to date advancements pertaining to protein interfacial behaviour in microfabricated overall research structures and microarrays. With over 3000 references, this is often a vital reference for pros and scholars in floor, pharmaceutical, colloid, polymer, and medicinal chemistry; chemical, formula, and alertness engineering; and pharmacy.

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Additional info for Biopolymers at Interfaces, Second Edition (Surfactant Science)

Example text

Polyampholytes behave differently. If their net charge is around zero, they tend to contract, because the formation of ion pairs between positive and negative groups leads again to an increase of entropy which drives the association. Synthetic polyampholytes therefore tend to be poorly soluble. Adding salt may improve the solubility and narrow the pH range in which there is phase separation (‘‘salting in’’) because the entropy gain of the ions becomes less. Hence, it may be misleading to consider only the net charge on a molecule.

Symp. 113:177–196 (1997). J. M. H. M. Scheutjens, G. J. Fleer, and M. A. Cohen Stuart, End effects in polymer adsorption: a tale of tails. Colloids Surf. 21:285–306 (1986). A. N. Semenov, J. Bonet-Avalos, A. Johner, and J. F. Joanny, Adsorption of polymer solutions onto a flat surface. Macromolecules 29:2179–2196 (1996). M. A. Cohen Stuart, F. H. W. H. Waajen, T. Cosgrove, T. L. Crowley, and B. Vincent, Hydrodynamic thickness of adsorbed polymer layers. Macromolecules 17:1825–1830 (1984). C. W.

Adsorption of polyelectrolytes is a self-killing process; the accumulation of charged polymer leads to a high electrostatic potential which will repel new incoming molecules. Even if these molecules could anchor under strong short-range interactions (complexation, hydrophobic interaction), they may not be able to reach the surface. If this occurs, the adsorbed amount is kinetically limited, rather than the outcome of a free energy balance. Lowering ␴p (pH shift) or adding salt may then lower the kinetic barrier and promote adsorption, but subsequently restoring the original conditions does not restore the corresponding adsorption.

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