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Mechanically Stretching Folded Nano‐ π‐b; ‐stacks Reveals Pico‐Newton Attractive Forces
Author(s) -
Kim Jung Sook,
Jung Yu Jin,
Park Joon Won,
Shaller Andrew D.,
Wan Wei,
Li Alexander D. Q.
Publication year - 2009
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.200801323
Subject(s) - materials science , atomic force microscopy , nano , substrate (aquarium) , nanotechnology , dendrimer , stack (abstract data type) , lock (firearm) , chemical physics , composite material , physics , mechanical engineering , polymer chemistry , computer science , programming language , geology , oceanography , engineering
Picoforce atomic force microscopy (AFM) and specific DNA hybridization have been used to lock on to synthetic nano‐π‐stacks, revealing the secrets of thermophilic, albeit weak, π–π interactions. A cone‐shaped dendron created an appropriate lateral spacing to ensure that most times a single stack was confined between the tip and the substrate, eliminating undesired multi‐molecular pulling and greatly simplifying data analysis.