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Tribological behavior of superhard amorphous carbon films The tribological behaviour of amorphous carbon films is determined by monomolecular covering layers strongly attached to the surface. They cause the very low friction in normal humid air, their absence in dry air or vacuum leads to high friction. Any lubricants usually do not improve the tribological behaviour in comparison to air. However for non‐hydrogenated ta‐C films by attachment of specially adapted lubricants an additionally marked reduction of friction is possible. 相似文献
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We report in situ ATR‐FTIR spectroscopy studies of the deposition of biocompatible polyelectrolyte multilayers (PEMs) consisting of the polycation chitosan (CHT) or poly(ethyleneimine) (PEI) and the polyanion sodium alginate (ALG) and their interactions with model‐protein human serum albumin (HSA). HSA‐adsorption data for PEI/ALG and CHT/ALG PEMs show the importance of the outermost polyelectrolyte (PEL) layer for protein interactions: CHT‐ or PEI‐terminated PEMs are highly attractive to HSA, while ALG‐terminated PEMs are repulsive, relevant for the generation of protein‐active or protein‐inert biomedical surfaces. The bound HSA is found to be located at the surface rather than the inner region of the PEM. 相似文献
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Brezesinski T Rohlfing DF Sallard S Antonietti M Smarsly BM 《Small (Weinheim an der Bergstrasse, Germany)》2006,2(10):1203-1211
WO3 thin layers with nanometer-scale periodicity were prepared by evaporation-induced self-assembly (EISA) using a novel amphiphilic block-copolymer template (poly(ethylene-co-butylene)-block-poly(ethylene oxide)). The evolution of the mesoporous ordered network and the crystallinity of the framework were monitored by 2D-SAXS, WAXS, SEM, XPS, and porosimetry. By annealing the films, the pore-wall crystallinity is adjusted between fully amorphous and highly crystalline without mesostructural degradation. Thus, the crystalline-film framework is composed of phase-pure monoclinic WO3 nanoparticles (12-14 nm in size). Furthermore, heat treatment transforms the originally spherical mesopores into ellipsoids, resulting in a unidirectionally shrunken, but still well-defined and fully accessible bcc mesopore architecture. The influence of mesoporosity and crystallinity on electrochemical/electrochromic characteristics was addressed by monitoring electrochemical features and the absorption changes during Li insertion/extraction (repetitive potentiostatic cycling). Both the amorphous and crystalline mesoporous films possess electrochromic response times on the order of only seconds, which are attributable to the facilitated insertion of guest ions due to shortening of the diffusion path lengths. Also, the insertion/extraction reversibility of crystalline WO3 layers with 3D mesoporosity is improved compared to amorphous ones and reaches values close to 100%. 相似文献
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