**Acknowledgements**

The authors are thankful to Chemtura Company for supplying the materials; Dr. Jianwen Liu, Sabine Krause, Birgit Schulze, Liane Häussler, Thanh Tran, Hang Tran, Dung Pham, Hieu Nguyen, Dat Nguyen, Xuan Vo, Linh Nguyen, Quang Le, Huan Vo, Chuong Hien, Men Tran, Truong Le, Huan Le, Nghia Tran, and Linh Pham for experimental assistance.
