Topic
Chemical state
About: Chemical state is a research topic. Over the lifetime, 2378 publications have been published within this topic receiving 78183 citations.
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TL;DR: In this article, the surface potential and isoelectric point of amine-bearing monolayers on flat gold substrates were observed to change with time, indicating that the surface functional group is not stable under ambient conditions (standard temperature and pressure).
Abstract: Amine-terminated self-assembled monolayers (SAMs) on Au surfaces are commonly used to immobilize various types of molecules, including DNA and proteins. However, little is known about the stability of these types of surfaces. In this work, it was observed that the surface potential (as well as the isoelectric point) of amine-bearing SAMs on flat gold substrates changed significantly with time, indicating that the surface functional group is not stable under ambient conditions (standard temperature and pressure). Contact angle analysis indicated that after degradation, the polar component of the interfacial force decreased and the dispersion component increased. These results indicate that the surface has undergone a chemical transformation. X-ray photoelectron spectroscopy (XPS) was used to detect changes in the chemical state of the surface nitrogen atoms. The chemical shift of the binding energy indicates that the nitrogen is partially oxidized. Using time-of-flight secondary ion mass spectrometry (ToF-...
39 citations
TL;DR: In this article, the effects of metalworking fluids on the processes of machining and grinding are discussed, including the chemical interactions which occur between the various participating surfaces, and the impact of the resulting chemical state of the surface produced is addressed.
39 citations
TL;DR: In this article, a two-phase CrN and CrO0.5N 0.1N0.9 films were produced by r.f.f.-sputtering and both compositions showed CrN (Fm-3m) structure in XRD.
39 citations
TL;DR: In this paper, the authors investigated the chemical state evolution of two alloying elements, Fe and Nb, when incorporated into the growing oxide layers of various production zirconium alloys, including Zircaloy-4, ZIRLO® and Zr 2.5Nb.
39 citations
TL;DR: In this article, the effect of surface segregation of chromium on oxide films formed on the surface of high-purity iron−13% and 25% chromium alloys at room temperature was confirmed by in-situ heating at 973 K under ultra high vacuum.
39 citations