1. School of Technology and Design, Växjö University, 351 95 Växjö, Sweden, Dipartimento di Chimica Industriale e dei Materiali, Bologna University, 40136 Bologna, Italy, Catator AB, Ideon, 223 70 Lund, Sweden, and Division of Ergonomics and Aerosol Technology, Lund University, Box 118, SE-22100 Lund, Sweden