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This work was financially supported by Portuguese Foundation for Science and Technology (FCT, project PTDC/AGR-TEC/4814/2014 and researcher grant IF/01005/2014). The authors also acknowledge ESMI (European Soft Matter Infrastructure) for the financial support (Proposal E160700746). The Coimbra Chemistry Centre, CQC, supported by FCT, through the project PEstOE/QUI/UI0313/2013, is also acknowledged. The cryo-TEM work was performed in the Technion Center for Electron Microscopy of Soft Matter, supported by the Technion Russell Berrie Nanotechnology Institute (RBNI).