IN-SITU MODEL OF MOLECULAR RECOGNATION IN THE BIOMINERALIZATION PROCES OF CALCIUM CARBONATE NANOFILM ON SODIUM DODECYL SULPHATE (SDS) SELF ASEMBLY MONOLAYER (SAM) BY MEANS OF ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY (EIS)

• Main Author: Vanda Wellia (NIM 2053022), Diana
• Format: Theses
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/7614
• Institution: Institut Teknologi Bandung

ABSTRACT: <br /> <br /> <br /> In the understanding of biomineralization, i.e the utilisation of composite organic-inorganic solid in biological system, is attracting increasing attention within the last few years. Biomimetic mineralization is suggested to understand biomineralization. Besides, it can be used for guiding the biomimetic synthesis of functional composites. In the present work, the biomineralization process was simulated in-vitro by the precipitation of calcium carbonate in the presence of self assembly monolayer of sodium dodecyl sulphate (SDS) on platinum surface. The goals of this research are to study biomineralization process from organic-inorganic hybrid system by using calcium carbonate molecules and SDS as organic gelator, to study the existence of molecular recognition in the system by Fourier Transformed Infra Red Spectroscopy, to evaluate the applicability of Electrochemical Impedance Spectroscoy technique used to characterize of biomineralization process in-situ and to study the effects of surfactant consentration and temperature in the formation of calcium carbonate-SDS nanocomposite. EIS results indicate that formation of calcium carbonat film is optimum for an SDS concentration range between 0,75 and 1.CMC at the temperature of 50 and 70 degree C, but not of room temperature. It was also supported by FTIR result where carbonate group and sulphate groups peak in 1418 dan 1104 cm1 for SDS consentration of 0,75.CMC, and 1418 dan 1103 cm 1 for SDS concentration of 1.CMC at temperature of 70 degree C.