By Nicholas D. Spencer
The focal point of this ebook is floor amendment, with the target of tailoring fabrics for a selected software. by way of this strategy, perfect bulk houses of a cloth, resembling its tensile energy (temperature balance, density, or perhaps expense) may be mixed with optimized floor homes, akin to hardness, biocompatibility, low or excessive friction or adhesion, water repellency or wettability, or catalytic task. The works of the writer - lots of his the most important papers are integrated - care for the knowledge and amendment of surfaces and span fields together with catalysis, analytical floor technological know-how, self-assembled monolayers, tribology, biomaterials, superhydrophobicity and polymer coatings.
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Extra info for Tailoring Surfaces: Modifying Surface Composition and Structure for Applications in Tribology, Biology and Catalysis (IISC Centenary Lecture Series)
Iron Single-Crystals as Ammonia-Synthesis Catalysts — Effect of Surface-Structure on Catalyst Activity. J Catal (1982) Vol. 74(1) pp. 129– 135. M. Bratlie, H. Lee, K. Komvopoulos, P. A. Somorjai. Platinum Nanoparticle Shape Effects on Benzene Hydrogenation Selectivity, Nano Lett. (2007) Vol. 7 pp. 3097–3101. A. Y. Park. Molecular Factors of Catalytic Selectivity. Angew. Chem. Int. Ed. (2008) Vol. 47 pp. 9212–9228. 5in 12 Tailoring Surfaces a) b) Figure 9: a) A drop of water on a lotus-leaf surface, b) “Cassie & Baxter” state of a droplet on a hydrophobic, rough surface.
Klein was among the first to recognize that polymer-brush-coated surfaces displayed exceedingly low friction coefficients under the appropriate good solvent 29 , and explained this in terms of entropic effects that inhibit both compression and interdigitation of the brush-coated surfaces. Klein began his work with polystyrene brushes, toluene serving as a solvent, but later moved on to PEG/water systems 30 . The use of waterbased brushes was significant, since it mirrors the way in which nature lubricates (see Chapter 2e).
Our first foray in this direction, in 1996, was to collaborate with the renowned ETH sugar chemist, Andrea Vasella, who was synthesizing short oligosaccharides terminating in sulfur species. By using a thiol group attached to a hexasaccharide as an anchor onto gold, we were able to create a high surface concentration of sugars, creating a potential platform for sugar-based experiments in biorecognition, tribology, and other areas. The sugars were adsorbed in both free and protected form, leading to different, but controllable surface coverages.