Article (Scientific journals)
Non-additivity of molecule-surface van der Waals potentials from force measurements
Wagner, Christian; Fournier, Norman; Ruiz, Victor G. et al.
2014In Nature Communications, 5
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Abstract :
[en] Van der Waals (vdW) forces act ubiquitously in condensed matter. Despite being weak on an atomic level, they substantially influence molecular and biological systems due to their long range and system-size scaling. The difficulty to isolate and measure vdW forces on a single-molecule level causes our present understanding to be strongly theory based. Here we show measurements of the attractive potential between differently sized organic molecules and a metal surface using an atomic force microscope. Our choice of molecules and the large molecule-surface separation cause this attraction to be purely of vdW type. The experiment allows testing the asymptotic vdW force law and its validity range. We find a superlinear growth of the vdW attraction with molecular size, originating from the increased deconfinement of electrons in the molecules. Because such non-additive vdW contributions are not accounted for in most first-principles or empirical calculations, we suggest further development in that direction.
Disciplines :
Physical, chemical, mathematical & earth Sciences: Multidisciplinary, general & others
Author, co-author :
Wagner, Christian;  Peter Grunberg Institut (PGI-3), Forschungszentrum Julich, 52425 Julich, Germany ; ̈ Julich Aachen Research Alliance (JARA)-Fundamentals of Future Information Technology, 52425 Ju ̈ lich, Germany
Fournier, Norman;  Peter Grunberg Institut (PGI-3), Forschungszentrum Julich, 52425 Julich, Germany ; ̈ Julich Aachen Research Alliance (JARA)-Fundamentals of Future Information Technology, 52425 Ju ̈ lich, Germany
Ruiz, Victor G.;  Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
Li, Chen;  Max-Planck- Institut fur Polymerforschung, Ackermannweg 10, 55128 Mainz, Germany
Muellen, Klaus;  Max-Planck- Institut fur Polymerforschung, Ackermannweg 10, 55128 Mainz, Germany
Rohlfing, Michael;  Institut fur Festkorpertheorie der Universitat Munster, Wilhelm-Klemm-Strasse 10, 48149 Munster, Germany
Tkatchenko, Alexandre ;  Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany
Temirov, Ruslan;  Peter Grunberg Institut (PGI-3), Forschungszentrum Julich, 52425 Julich, Germany ; ̈ Julich Aachen Research Alliance (JARA)-Fundamentals of Future Information Technology, 52425 Julich, Germany
Tautz, F. Stefan;  Peter Grunberg Institut (PGI-3), Forschungszentrum Julich, 52425 Julich, Germany ; ̈ Julich Aachen Research Alliance (JARA)-Fundamentals of Future Information Technology, 52425 Julich, Germany
External co-authors :
yes
Title :
Non-additivity of molecule-surface van der Waals potentials from force measurements
Publication date :
2014
Journal title :
Nature Communications
ISSN :
2041-1723
Publisher :
NATURE PUBLISHING GROUP, MACMILLAN BUILDING, 4 CRINAN ST, LONDON N1 9XW, ENGLAND, Unknown/unspecified
Volume :
5
Peer reviewed :
Peer Reviewed verified by ORBi
Commentary :
Article
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