Chapter 7 **Calcium Phosphate/Clay Nanotube Bone Cement with Enhanced Mechanical Properties and Sustained Drug Release 123** Udayabhanu Jammalamadaka, Karthik Tappa and David K. Mills

Chapter 8 **The Effect of Clay Type on the Physicochemical Properties of New Hydrogel Clay Nanocomposites 147** Tatiana Munteanu, Claudia Mihaela Ninciuleanu, Ioana Catalina Gifu, Bogdan Trica, Elvira Alexandrescu, Augusta Raluca Gabor, Silviu Preda, Cristian Petcu, Cristina Lavinia Nistor, Sabina Georgiana Nitu and Raluca Ianchis
