The authors apologise for the omission of the Acknowledgements section from their original article. The Acknowledgements are as follows: The authors thank the European Synchrotron Radiation Facility (Grenoble, France) for the provision of synchrotron radiation facilities and the ID02 beamline staff for the excellent support. Furthermore, we thank Dr Laura Kollau for help with the DSC measurements, and Dr Mark Vis and Lisa Timmers for help with the SAXS measurements. The Royal Society of Chemistry apologises for these errors and any consequent inconvenience to authors and readers. aLaboratory.