One-Pot Preparation of Hollow Silica Spheres by Using Thermosensitive Poly(N -isopropylacrylamide) as a Reversible Template Binyang Du, Zheng Cao, Zhenbing Li, Aixiong Mei, Xinghong Zhang, Jingjing Nie, Junting Xu and Zhiqiang Fan Langmuir, 2009, 25 (20), pp 12367–12373