Assemble Control of Sodium Dodecyl Sulfate Layers by Induced Charges of Electrically Poled Hydroxyapatite Ceramics

Abstract

Effects of induced surface charges generated by electrical poling on sodium dodecyl sulfate film formation on hydroxyapatite (HA) ceramic substrates from the aqueous solution. The HA ceramic disk cramped with a pair of Pt electrodes was polarized in air at a temperature ranging from 300 to 500°C for 1h in a dc electric field of 1 kVcm^-1. The films on the non-poled HA ceramics was significantly thicker than those on the poled ceramics, regardless of the charge polarity. The characteristic absorption band at 1500-1700 cm^-1 was detected in the films on the negatively charged HA surfaces by FT-IR spectroscopy. It was revealed that the induced charges affected the formation rate and the structures of SDS films.