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\subsubsection{\texorpdfstring{Micro-fastening system: nanovelcro}{Microfastening system nanovelcro}}
\label{sec:microfastening_system_nanovelcro}


We have explored the suitability of nanotube-based hooks for bonding.
Our results indicate that a large force of 3.0 nN is required to
disengage two hooks, which are formed by the insertion of
pentagon-heptaon pairs in a (7,0) CNT. Nanohooks based on various
nanotubes are resilient and keep their structrual integrity during the
opeing process. Arrays of hooks, which are permanetly anchored in
solid surfaces, are a nanoscale counterpart of velcro fasteners,
forming tough bonds with a capability of self-repair.

This micro-fastening system was rigisterd as a US patent (US7,181,811).

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