* Corresponding authors

^a Berzelii Center EXSELENT on Porous Materials and Department of Materials and Environmental Chemistry, Arrhenius Laboratory, Stockholm University, SE-106 91 Stockholm, Sweden
E-mail: shen@mmk.su.se
Fax: +46-8-152187
Tel: +46-8-162388

^b School of Engineering and Materials Science, Queen Mary University of London, Mile End Road, London, UK
E-mail: h.x.yan@qmul.ac.uk
Tel: +44 (0)20-78825568

^c Department of Materials Science and Engineering, Royal Institute of Technology, S-100 44 Stockholm, Sweden
E-mail: belova@mse.kth.se
Tel: +46-(0)8-790 8372

^d Department of Materials Science and Engineering, State Key Lab of New Ceramics and Fine Processing, Tsinghua University, Beijing 100084, China
E-mail: cwnan@mail.tsinghua.edu.cn
Tel: +86-10-62773587

^e Komponenten der Mikroelektronik und Mikrosystemtechnik, Fraunhofer-Institut für Werkstoffmechanik IWM, Walter-Hülse-Str. 1, D-06120 Halle, Germany
E-mail: thomas.hoeche@iwmh.fraunhofer.de
Fax: +49 345 55 89 101
Tel: +49 345 55 89 197