1. Department of Physical and Analytical Chemistry, Uppsala University, Box 259, SE-751 05 Uppsala, Sweden, Department of Chemistry, KTH - Royal Institute of Technology, Teknikringen 30, SE-100 44 Stockholm, Sweden, State Key Laboratory of Fine Chemicals, DUT-KTH Joint Education and Research Centre on Molecular Devices, Dalian University of Technology (DUT), Dalian 116012, China, and Swerea IVF AB, Box 104, SE-431 22 Mölndal, Sweden