Description Octenyltrichlorosilane, mixture of isomers (OTTS) is a derivative of trichlorosilane that forms a self-assembled monolayer (SAM) on a variety of substrates. It can be utilized in adhesion promotion and in the modification of surface characteristics.OTTS forms a SAM on silica coated alumina implants which find potential application in orthopedics as a useful biomaterials.