Surface wrinkling and cracking dynamics in the drying of colloidal droplets Yongjian Zhang, Yimeng Qian, Zhengtang Liu, Zhiguang Li and Duyang Zang Eur. Phys. J. E, 37 9 (2014) 84 Published online: 26 September 2014 DOI: 10.1140/epje/i2014-14084-3