Our work on the electrochemical synthesis of hydroxyapatite has been accepted for publication in the Journal of Chemical Engineering of Japan (Impact Factor 0.61). This journal is an official publication of the Society of Chemical Engineers, Japan. It is dedicated to providing timely original research results in the broad field of chemical engineering ranging from fundamental principles to practical applications.
An Experimental and theoretical investigation of the formation of hydroxyapatite particles prepared by an electrochemical method
Adrian Nur and Heru Setyawan
Electrochemical synthesis of hydroxyapatite particles was performed galvanostatically from a homogeneous solution of Na2H2EDTA×2H2O, KH2PO4 and CaCl2. The electrogeneration of OH– ions by water reduction at the cathode plays an important role in the formation of hydroxyapatite by an electrochemical method. The OH– ions induce the liberation of Ca2+ ions and the dissociation of phosphoric acid, which serve as the reactants for the formation of hydroxyapatite. We found that the final product obtained, i.e., brushite or hydroxyapatite (HA), corresponds to the pH of the solution. Brushite is formed when the pH is < 7, and HA is formed when the pH > 7. Aging the suspension for 72 h at 40transforms brushite to HA even at pH < 7. The presence of Ca2+ during aging accelerates brushite conversion. EDTA serves as a chemical agent to mediate particle nucleation and growth. The reaction mechanism and its kinetic model proposed for the HA formation could predict the experimental results well.
This morning (Friday, Jan 30, 2015), Adrian Nur had his open doctoral presentation for his graduation in Aula Oedjoe Djoeriaman, Department of Chemical Engineering ITS. The title of his presentation is ‘Synthesis of hydroxyapatite by electrochemical method and its applications. He has succeeded to defend his dissertation in January 16, 2015 in front of the examiners, two from the Department of Chemical Engineering (Prof. Sugeng Winardi and Dr. Samsudin Affandi) and one from Sebelas Maret University (Dr. Agus Purwanto). His supervisors are Prof. Heru setyawan and Prof. Arief Widjaja.
Hydroxyapatite (HA) is one of calcium phosphate compounds which is usually used as bone substitutes. His concern about people health has encouraged him to develop a simple and cheap method to prepare the material. He has been successfully prepared HA nanoparticles by an electrochemical method and applied the material to coat metal for bone implant. His important contribution on this field brought him to obtain doctoral degree in Chemical Engineering.
Adrian Nur is a lecturer of the Department of Chemical Engineering, Sebelas Maret University. He joined our laboratory to take doctoral course in 2009. After his graduation, he will returned back to Sebelas Maret University as a lecturer.
Adrian Nur and Nanik Astuti Rahman presented their paper on National Seminar of Chemical Engineering of Indonesia (Seminar Nasional Teknik Kimia Indonesia, SNTKI 2012) in 20-21 September 2012 in Jakarta. This seminar is held every three year by Asosiasi Pendidikan Teknik kimia Indonesia (Association of Chemical Engineering Education of Indonesia). This year seminar was organized by the Department of Chemical Engineering, Indonesia University. Adrian presented his paper about synthesis of nanoscale hydroxyapatite by electrochemical method and Nanik presented about in-situ grafting of amine on silica gel produced from bagasse ash.