Dr. (Mrs.) D.D.D.H. Alwis

Senior Lecturer Grade (II)

Faculty of Natural Sciences

Central Campus, First floor, Science and Technology building, Room No : 137

Office: +94112881257, Ext: 257

Email: ddalw@ou.ac.lk dusha_usjp@yahoo.com

I graduated from the University of Sri Jayewardenepura, Sri Lanka with a First Class (Hons) in B.Sc Special degree in Chemistry in 2005. Further I successfully completed the Graduate ship course in Chemistry offered by the College of Chemical Sciences, Institute of Chemistry Ceylon in 2003. I served as a temporary Demonstrator at the University of Sri Jayewardenepura and The Open University of Sri Lanka since 2006 to 2008.

Then, I joined The Open University of Sri Lanka as a Lecturer (Probationary) in year 2008. After a short period I commenced my higher studies in University of Sri Jayewardenepura, Sri Lanka and I received my Ph.D in Chemistry in 2016. My thesis is based on the Spectroscopic and Photochemical properties of carotenoids such as lycopene, β-carotene, bixin, norbixin and their oxidized intermediates were investigated using UV-vis, fluorescence and UV-vis diffuse reflectance spectroscopic (UV-vis DRS) techniques and small angle neutron scattering (SANS) studies.

After that I was promoted to the Senior Lecturer (Grade II) in Chemistry in year 2016.

Positions held:

Executive Committee member, Section E-2 (Chemical Sciences), Sri Lanka Association for the Advancement of Science (SLAAS), Sri Lanka (2018)

Secretary, The Buckyball Society, Department of Chemistry, The Open University of Sri Lanka. 2018

Executive Committee member, The Open University Teacher’s Association (OUTA), The Open University of Sri Lanka. 2017

Secretary, The Buckyball Society, Department of Chemistry, The Open University of Sri Lanka. 2016

Member, I was a member in the American Physics Society (APS) 2015.

Member, Institute of Chemistry Ceylon, College of chemical sciences since 2013.

Area of Specification:

Physical Chemistry

Research Intrests:

Photochemistry and spectroscopy of carotenoids and their radical cations


Member of IChem, Member of SLAAS

Programmes Coordination:

B.Sc Degree Programme

Course Coordination:

CYU5304, CYU5307, CYU6606


1. Alwis, D. D. D. H.; Bandarage, G.; Zoysa, M.N.K.De. Assessing the prior knowledge and thinking skills of students related to glassware in an undergraduate practical chemistry course; A preliminary study. 24th IUPAC International Conference on Chemistry Education (ICCE 2016), Malaysia 2016, TCE 04, Pg. 61.

2. Alwis, D. D. D. H.; Chandrika, U. G.; Jayaweera, P. M., The Optical absorption spectra of Self-assembled aggregates of β-carotene. Proceedings of the Annual Academic sessions of the Open University of Sri Lanka, 2015, p 65-68.

3. Alwis, D. D. D. H.; Chandrika, U. G.; Jayaweera, P. M., Photosensitization of TiO2 semiconductor nanoparticles by carotenoids in solution: photo degradation of carotenoids on TiO2 surface. Journal of Photochemistry and Photobiology, in preparation.

4. Alwis, D. D. D. H.; Ratnaweera, D.; Dadmun, M.; Chandrika, U. G.; Jayaweera, P. M., A scattering study of the conformational structure and aggregation behavior of conjugated polyene in acetone, In preparation.

5. Dusantha Alwis.;  Dilru Ratnaweera.; Thusith Etampawala.;  Mark Dadmun.;  Udumalagala Chandrika.;  Pradeep Jayaweera.; Self-Assembly of Carotenoids During Solution Casting of Solar Devices, American Physical Scoiety MAR15 Meeting.2015, 60 (2).

6. Alwis, D. D. D. H.; Chandrika, U. G.; Jayaweera, P. M., Spectroscopic studies of neutral and chemically oxidized species of β-carotene, lycopene and norbixin in CH2Cl2: Fluorescence from intermediate compounds. Journal of Luminescence 2015, 158 (0), 60-64.

7. Alwis, D.D.D.H.; Chandrika, U.G.; Jayaweera, P. M., UV light induced photo-degradation      study of carotenoids in MeOH: The influence of inorganic anions, ICMA proceedings of the International conference of multidisciplinary approaches, University of Sri Jayewardenepura Sri Lanka, 2014, p. 146.

8. Alwis, D.D.D.H.; Chandrika, U.G.; Jayaweera, P.M. “Absorption and Emission Properties of Lycopene, β-Carotene, Norbixin and Their Chemically Oxidized Species, Annual sessions of the Institute of Chemistry Ceylon, Chemistry in Sri Lanka. 2013, 30 (2), p 13-14.

9. Alwis, D.D.D.H.; Rathnayake, W.M.K.M.; Chandrika, U.G.; Jayaweera, P.M. A kinetics study of photodegradation of lycopene in water/acetone solutions, Proceedings of the 68th Annual Sessions of Sri Lanka association for advancement of science. 2012, p. 69.




Ongoing Research:

Undergraduate Research projects are being carried out under the topic of “Chemical and spectroscopic studies on carotenoids and their aggregates”.

Absorption of selected pesticide residues By plants

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