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UNESCO Centre for Membrane Science and Technology |
Oka Ratnayani
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Profile:
EDUCATION
- B.Sc., Chemistry, Institut Teknologi Bandung (ITB), Indonesia, 1995
- M.Sc., Chemistry, Institut Teknologi Bandung (ITB), Indonesia, 1998
Research Project Summary:
NOVEL MEMBRANES WITH HONEYCOMB STRUCTURE BASED ON STAR-POLYMERS
This project focuses on the preparation of honeycomb structure films based on star-polymers for potential membrane application.
The star-polymers are synthesized using Atom Transfer Radical Polymerization (ATRP) method. The casting solution is prepared
by dissolving the star-polymers into volatile solvents such as carbon disulfide (CS2) or dichloromethane (DCM). Film casting is
carried out using self-assembly method under humid condition.
Field Emission Scanning Electron Microscope (FESEM) is used to investigate the effect of star-polymers properties (number and length of arms) as well as casting parameters on the film morphology. Casting parameters include concentration of casting solution, type of solvent, humidity, moist airflow rate, temperature, additive, and casting using dip-coating method. The mechanism of self-assembly formation is studied using microscope and CCD camera. The light scattering method will also be designed to observe the formation of honeycomb structure films.
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| Film surface | Film cross section |
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| Honeycomb film produced by dip coating | |
SUPERVISORS
Prof A.G. FaneA/Prof V. Chen
Prof T.P. Davis
Selected Publications:
- O. Ratnayani, V. Chen, A. G. Fane, T. P. Davis, M. Stenzel, M. Whittaker, "Novel Membranes with Honeycomb Structure Based on Star-polystyrenes", presented at the 5th International Membrane Science and Technology Conference (IMSTEC), 10-14 November 2003, Sydney, Australia.
- O. Ratnayani, V. Chen, A.G Fane, T. P. Davis, "Self-assembly Honeycomb Structure Membranes Made of Star Polymers", presented at the Water Environment-Membrane Technology (WEMT), International Water Association (IWA) Specialty Conference, 7 - 10 June 2004, Seoul, Korea.
- V. Chen, O. Ratnayani, A. Fane, T. Davis, M. Stenzel, S. Angus, "The Influence of Casting Parameters on the Formation of Honeycomb Films Based on Star Polymers", presented at the North American Membrane Society (NAMS) 2004 Meeting, 26-30 June 2004, Honolulu, Hawaii.