Transformation of non-orthogonal X-junction of single-walled carbon nanotubes into parallel junction by heating

► Non-orthogonal X-junctions of UTCNTs are prone to transform into parallel-junction by heating at high temperature. ► The torque and the corresponding angular displacement of the UTCNTs in this transformation are analyzed. ► The transformation is a result of the torque originating from the heating of the non-orthogonal X-junction.