Browsing Physics by Title

Now showing items 1-20 of 247

3D Imprint Lithography Using Sixny Molds

Jayatissa, N.W.K.; Alkaisi, M.M.; Blaikie, R.J. (2002)

Three-dimensional patterning reduces more complicated alignment steps in the fabrication of micro and nano-scale structures. Multiple lithography processes with interlevel alignment or single lithography with multi layer ...
A Correlation between activation energy and light absorption of WO3 incorporated TiO2

Dharmaratna, W.G.D.; Roshan, P.W.C.; Siripala, W.; Wijesundera, R.P. (2002)

The variation of electrical conductivity properties and light absorption properties are studied in W 6+ incorporated Ti02, Both conductivity and light absorption depend on the percentage of W 6+ incorporated into the ...
A Cu2O/TiO2 heterojunction thin film cathode for photoelectrocatalysis

Siripala, W.; Ivanovskaya, A.; Jaramillo, T.F.; Baeck Sung-Hyeon; McFarland, E.W. (Solar Energy Materials and Solar Cells, 2003)

A thin film heterojunction photocathode was developed consisting of 100nm of n-type titanium dioxide (TiO2) cathode surface deposited on p-type cuprous oxide (Cu2O). The cuprous oxide was deposited electrochemically on Ti ...
A Fundamental Study of the Transport Properties of Aqueous Superacid Solutions

Suarez, S.N.; Jayakody, J.R.P.; Greenbaum, S.G.; Zawodzinski, T.; Fontanella, J.J. (Journal of Physical Chemistry B, 2010)

An extensive investigation of the transport properties of aqueous acid solutions was undertaken. The acids studied were trifluoromethanesulfonic (CF3SO3H), bis(trifluoromethanesulfonyl)imide [(CF3SO2)2NH], and para-toluenesulfonic ...
A Home Made Double Slab Pyranometer for Irradiance Measurements

Punyasena, M.A.; Jayasuriya, K.D. (Proceedings of the 44th Technical Session of the Sri Lanka Association for the Advancement of Science (SLAAS), 1988)
A Mössbauer effect study of barium ferrite ball-milled in air

Jayasuriya, K.D.; Kaczmarek, W.A.; Wu, E.; Campbell, S.J. (Hyperfine Interactions, 1994)

The effects of dry-milling BaFe12O19 in air for periods of 190, 360, 590, 690 and 1000 h have been investigated by X-ray diffraction and M�ssbauer effect measurements. The sizes of the BaFe12O19 particles decrease on ...
A Mössbauer study of ball-milled Co?Fe?Si?B: I: dry milling

Jayasuriya, K.D.; Campbell, S.J.; Calka, A.; Jing, J. (Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 1993)

X-ray diffraction and M�ssbauer effect measurements of ball-milled Co?Fe?Si?B material which had first been re-crystallized from amorphous melt-spun ribbon are presented. Fully amorphous powders have been obtained after ...
A Mössbauer study of ball-milled Co?Fe?Si?B: II: with surfactants

Jayasuriya, K.D.; Campbell, S.J.; Calka, A.; Jing, J. (Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 1993)

The use of a range of organic surface active substances in the ball milling of Co?Fe?Si?B has been studied by X-ray diffraction and M�ssbauer effect measurements. Effects characteristic of superparamagnetic relaxation of ...
A Mössbauer study of the oxidation state of Fe in silicate melts

Jayasuriya, K.D.; O-Neill, H.S.C.; Berry, A.J.; Campbell, S.J. (American Mineralogist, 2004)

Fe3+/?Fe ratios were determined from M�ssbauer spectra recorded for a series of 17 anorthite-diopside eutectic glasses containing 1 wt% 57Fe2O3 quenched from melts equilibrated over a range of oxygen fugacities from fO2~ ...
A multinuclear NMR study of ion transport in P(EO)nLiBETI complexes

Suarez, S.N.; Abbrent, S.; Jayakody, J.R.P.; Greenbaum, S.G.; Shin, J.H.; Passerini, S. (Solid State Ionics, 2005)

A study of ion transport in P(EO)nLiBETI complexes was undertaken, using both AC impedance and nuclear magnetic resonance (NMR) spectroscopy. 1H, 7Li and 19F NMR techniques were used to investigate structure and dynamics ...
A Photoelectrochemical Investigation of n- and p-type semi�conducting behaviour of Copper Oxide Films

Siripala W; Kumara K P (Semiconductor Science and Technology, 1989)

Copper(I) oxide films were prepared on copper substrates by exposing them to solutions containing Cu2+ ions, and it was observed that the photoresponse of these films electrodes in a photoelectrochemical cell is both n- ...
A Photoluminescence Study on CuInS2 Thin Films Prepared by the Sequential Deposition Technique

Wijesundera, R.P.; Siripala, W. (Annual Research Symposium -Faculty of Graduate Studies, University of Kelaniya, 2001)

Solar energy conversion to electrical energy using low cost solar cells contributes substantially for a solution to the present global energy crisis. In this respect, various semiconductor materials are being studied for ...
A specific heat study of natural haematite around the Morin transition and the effects of entrapped water

Jayasuriya, K.D.; Stewart, A.M.; Campbell, S.J. (Journal of Physics and Chemistry of Solids, 1985)

The Morintransition in samples of natural haemitite has been examined by specificheat and M�ssbauer measurements. Specificheat measurements on as-received samples reveal an anomaly at ? 273.2 K and irregular behaviour at ...
A Study of CuInS2 Thin Films for Photovoltaic Applications

Wijesundera, R.P.; Nadesalingam, M.P.; Siripala, W.; Jayasuriya, K.D.; Kalingamudali, S.R.D.; Jayanetti, J.K.D.S.; de Silva, K.T.L. (Proceedings of the Technical Session of Institute of Physics, 1999)

Thin films of copper indium disulphide (CuInS2) on Ti Substrate were prepared by annealing potentiastatically electrodeposited Cu-In alloy in H2S gas at 5500 C. Films were characteristised by X-ray diffraction (XRD), ...
A study of Peltier effect in a thermoelectric couple of n-type cuprous oxide and p-type cuprous sulfide semiconductors

Abeywarna, U.K.; Gunawardana, E.P.P.C.; Bopege, D.N.; Rajapakse, R.R.M.; Wijesundera, R.P.; Siripala, W. (Proceedings of the Annual Reaserch symposium, 2003)
A Study of Temperature and Salinity Variations with Depth in Salt Pans at Palavi in North-West Region of Sri Lanka

Hewageegana, P.S.; Amarasekara, C.D.; Jayakody, J.R.P.; Punyasena, M.A. (Annual Research Symposium, Faculty of Graduate Studies, University of Kelaniya, 2000)
A Study of Wind Effects on Thermal Stability of Salt Pan Solar Ponds

Punyasena, M.A.; Amarasekara, C.D.; Jayakody, J.R.P.; Perera, P.A.A. (Annual Research Symposium, Faculty of Graduate Studies, University of Kelaniya, 2001)
Absolute phase effect in ultrafast optical responses of metal nanostructures

Stockman, M.I.; Hewageegana, P. (APPLIED PHYSICS A: MATERIALS SCIENCE & PROCESSING, 2007)

We predict that nonlinear ultrafast electron photoemission by strong optical fields and, potentially, other nonlinear optical responses of metal nanostructures significantly depend on the absolute (carrier?envelope) phase ...
Advantages of the use of solar cells and light emitting diodes (LED) for traffic signal lights for the current power crises in Sri Lanka

Kalingamudali, S.R.D.; Kalingamudali, M.L. (2002)

During power failures and power cuts road users suffer immense difficulties due to non-availability of traffic signal lights. Use of solar cells with lead acid accumulators to provide required power and the use of light ...
Ammonium sulfide surface treatment of electrodeposited p-type cuprous oxide thin films

Jayathileke, K.M.D.C.; Kapaklis, V.; Siripala, W.; Jayanetti, J.K.D.S. (Electronic Materials Letters, 2014)

The effects of ammonium sulfide surface treatment on electrodeposited p-type polycrystalline cuprous oxide (Cu2O) thin films deposited on Ti substrates were studied. The structural and morphological properties of the films ...

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