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The orientation of a single  para-xylene molecule within a zeolite pore can be used to monitor the van der Waals interactions between that molecule and the porous material A recently developed electron microscopy technique has allowed scientists to measure van der Waals interactions by precisely imaging the changes in orientation of individual  para-xylene molecules confined in the channels of a zeolite matrix. 1 The setup resembles a nanoscale compass in which the hydrocarbon molecule is the rotating pointer and the positions of the atoms around the hole define the direction markers. ‘Ou...