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Illuminating the no-man's land of waters' surface
Date:11/27/2012

and light diffusion. Using carefully filtered lasers channeled through a complex circuit of mirrors and lenses, she "hits" her sample barely a drop and measures the wavelength of the light that escapes from it. With this she can detect whether or not there are nanoscopic molecules on the interface between the oil and the water.

The precision of the observations "shows that negative charges exist even in a total absence of surface impurities, and thus the explanation put forward by my colleagues, which was derived from charge measurements and chemical titrations of the bulk liquids, doesn't hold up," says Roke. "We have developed a unique apparatus that can distinctly measure the interfacial structure of a layer on the sub-nanometer length scale that surrounds a droplet of oil in water. Thus, we can 'see' what is on the interface, and do not have to deduce it from comparing bulk properties, which is far less accurate."

Disproving a hypothesis isn't enough to explain a phenomenon, however. Roke is studying a promising avenue, that explores the intrinsic quantum nature of the water molecule itself, which might be responsible for the phenomenon. "The measurements we've made as part of this refutation could be used to try and prove this explanation," she says. "It's fascinating, because quantum effects (the smallest of the smallest) might be responsible for macroscopic charging effects that influence so many properties that relate to the functioning of the human body."


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Contact: Sylvie Roke
sylvie.roke@epfl.ch
41-216-931-191
Ecole Polytechnique Fdrale de Lausanne
Source:Eurekalert  

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