منابع مشابه
To wet or not to wet? Dispersion forces tip the balance for water ice on metals.
Despite widespread discussion, the role of van der Waals dispersion forces in wetting remains unclear. Here we show that nonlocal correlations contribute substantially to the water-metal bond and that this is an important factor in governing the relative stabilities of wetting layers and 3D bulk ice. Because of the greater polarizability of the substrate metal atoms, nonlocal correlations betwe...
متن کاملMetals and Non-metals
Ductile: Substances that can be drawn into thin wires are called ductile. For example, most of the metals are ductile. Question 2: Why is sodium kept immersed in kerosene oil? Answer: Sodium and potassium are very reactive metals and and combine explosively with air as well as water. Hence, they catch fire if kept in open. Therefore, to prevent accidental fires and accidents, sodium is stored i...
متن کاملUse of Heavy Metals in Textile Wet Processing
The currently recommended concentrations of aftertreatments containing heavy metals often prevent a textile finisher from meeting effluent discharge regulations. This study involved optimizing the application procedures and concentrations of copper sulfate for copperizing direct dyes on cotton and of tartar emetic (potassium antimony tartrate) for insolubulizing tannic acid on dyed nylon. The r...
متن کاملHeavy metals, PAHs and toxicity in stormwater wet detention ponds.
Concentrations of 6 different heavy metals and total polycyclic aromatic hydrocarbons (PAHs) were determined in stormwater runoff and in the pond water of two Danish wet detention ponds. The pond water samples were analyzed for toxic effects, using the algae Selenastrum capricornutum as a test organism. Stormwater and pond water from a catchment with light industry showed high levels of heavy m...
متن کاملEpitaxial Graphene on Metals
In this chapter, we review the recent results on graphene films epitaxially grown on 3d 5d transition-metal surfaces focussing mainly on their atomic structure, aspects of chemical interaction both with the substrate and with adsorbates and the electronic structure of graphene at the interface. We discuss a possibility to prepare sandwich-like structures in the form of intercalates as a possibl...
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ژورنال
عنوان ژورنال: Science
سال: 1911
ISSN: 0036-8075,1095-9203
DOI: 10.1126/science.34.862.22