How to easily and completely disable/enable WLAN (so it cannot be turned on again while travelling)?

How to easily and completely disable/enable WLAN (so it cannot be turned
on again while travelling)?

I have a procrastination problem. I need to study for an exam, but instead
of learning, I answer questions on cogsci.stackexchange.com, which can
take hours at a time. The problem is, I need my laptop to learn, because I
have stuff on it that is too much to print, so I cannot just leave it at
home when I go to the university library. Therefore, I'd like to disable
my WLAN connection in a way that I cannot turn it on again while I'm in
the library, but can easily re-activate when I'm back home and connected
to the internet or my iMac through my cable network.
How can I easily deinstall and reinstall WLAN, without losing my profiles
or disturbing anything else?
MacBook Air, 13", mid 2012 OS X 10.8.4