
Kaveenga KoswattageSabaragamuwa University of Sri Lanka | SUSL
Kaveenga Koswattage
PhD
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84
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Introduction
Publications
Publications (84)
Solar photovoltaic technology is a fast growing form of renewable energy with many positive factors such as low cost, environmental friendliness, energy independence, etc. But, one of the major drawbacks of solar photovoltaic technology is the less efficiency compared to other forms of renewable energy technologies. There are many factors affecting...
Many industries use synthetic rubber for various industrial purposes; thus, disposal of synthetic waste rubber into the environment causes huge environmental problems. A feasibility study to convert synthetic Nitrile Butadiene Rubber (NBR) waste into valuable products using batch-type slow pyrolysis will benefit small- to medium-scale industries in...
Solar PV technology is one of the fastest-growing forms of renewable energy globally. Among all forms of renewable energy technologies, solar photovoltaics generally have comparatively lower power efficiency. This lower power efficiency of current solar PV systems has influenced the researchers to focus on improving the efficiency of solar PV syste...
In the current scientific world the majority of researchers use computational simulation methods to optimize and identify the outcomes and results. When working with the biogas production processes widely use ASPEN Plus V14 simulation software and for this study used the same software. The importance was through this computer simulation processes c...
Energy drives the global growth and one of the major forms of renewable energy, biogas could be made out of wastes produced in the locations of slaughtering by practical biochemical methods inclusive of anaerobic digestion. The primary environmental impact of slaughter activities is contamination, resulting from the release of waste materials such...
Sugarcane bagasse ash (SCBA) is garnering increasing attention as a promising supplementary material in various industries, including construction, rubber, and paper. This study investigates the effects of incorporating sugarcane bagasse ash into paper pulp and analysis of data to seek its effectiveness on chemical and physical properties was done...
The genus Salacia (Celastraceae family) comprises over 200 species distributed across the In-dian subcontinent, Africa, and tropical zones, typically found as woody climbers in forests. InSri Lanka, five species are recorded- S. acuminatissima, S. chinensis, S. diandra, S. oblonga andS. reticulata is particularly notable for its medicinal propertie...
Citation: Samarathunga, A.I.; Kulasooriya, W.G.C.M.; Sewwandi, H.M.D.U.; Vithanage, V.; Induranga, A.; Kumara, B.S.; Koswattage, K.
Salacia spp. belong to the family Celastraceae, with some species native to Sri Lanka and listed as endangered or near threatened on the National Red List 2012 of Sri Lanka. The higher content of secondary metabolites in this plant hindered the extraction of sufficient quantities of good-quality DNA for downstream processes like PCR and DNA sequenc...
Solar photovoltaic technology is emerging as the most popular renewable energy source globally due to its environmental benefits, low operation and maintenance costs, modularity, flexibility, and energy independence. However, despite many advancements in the past few decades, the efficiency of commercially used solar photovoltaic panels remains rel...
This research study outlines the Computational Fluid Dynamics (CFD) analysis of a Controllable Pitch Propeller (CPP), which is emerging in the maritime industry. This project aimed to comprehensively investigate the hydrodynamic properties and operational parameters of a four-bladed controllable pitch naval propeller. A scaled-down propeller was us...
Nanofluids enhance thermo-physical properties in many applications, such as automotive industry, electronic and microelectronic, energy sector, manufacturing and material processing, etc. Nanofluids in automotive industry help to maintain and enhance the lubricating and cooling properties, especially in engines. This study reports the effect on the...
Nanofluids have emerged as a trending topic in various engineering disciplines since the early 21 st century. These fluids, containing metallic, metal-oxide, or carbon nanoparticles with sizes smaller than 100 nm, significantly enhance thermo-physical properties such as thermal conductivity, thermal diffusivity, kinematic viscosity, dynamic viscosi...
L-cysteine, a sulfur-containing amino acid, is known for forming bioactive surfaces through its strong interactions with metallic surfaces via its SH group. Among all noble metals, its bond with silver is considered unique and stronger. Although L-cysteine demonstrates a strong and distinctive interaction with silver, the electronic structure of th...
Solar photovoltaic (PV) systems promise a reliable future for renewable energy adoption, with the capability for mitigating greenhouse gas emissions and combating climate change while providing a sustainable energy solution to the planet. This study investigates the efficiency of solar tracking technology in tropical regions, focusing on Sri Lanka,...
The integration of nanotechnology into plant tissue culture represents a significant advancement in agricultural biotechnology. This review explores the transformative potential of nanoparticles in enhancing various processes within plant tissue culture. This review discussed how nanoparticles improve micropropagation efficiency by reducing contami...
Enhancing the thermal and flow characteristics of gasoline is a major concern of gasoline and critical due to increasing fuel consumption in the transportation sector. Fuel additives play an important role in enhancing the efficiency of gasoline vehicles. They provide a cost-effective and simple way to achieve maximum power and fuel economy by enha...
Nanofluids are emerging as a promising coolant for industrial heat transfer applications due to their improved thermo-physical properties. However, the sedimentation of nanoparticles possesses a significant challenge that impacts the stability of nanofluids. In this study, an experimental setup was developed using a turbidity sensor and a data acqu...
The current automotive industry requires battery cooling and thermal management systems for improve the efficiency of EVs (Electric Vehicles) and other battery-based products. Therefore, designed the battery cooling plate using Solid Edge 2022 student edition and did the CFD (Computational Fluid Dynamics) analysis for this cooling plate using Ansys...
Solar photovoltaic (PV) systems have become the most popular source of renewable energy in Sri Lanka over the past decade. The efficiency degradation of solar PV panels with increasing operating temperature is one of the main challenges faced by photovoltaic panels globally. This scenario is comparatively more common for the solar PV systems instal...
This study investigates the impact of Chitosan nanoparticles (CS-NPs) on the thermal properties of nanofluids at different temperatures and weight fractions. To the best of our knowledge, these CS-NPs, synthesized from oyster mushrooms (Pleurotus ostreatus), are used for the first time to prepare nanofluids. These nanofluids offer high potential fo...
TiO2 has been recently used in organic light emitting devices (OLED) in different layers as embedded nano particles, nano composites. These nano materials are reported to be useful in enhancing OLED device performance such as charge injection. Usually, TiO2 is industrially synthesized by either sulfate or chloride processes, which are known to be e...
Motion Capture (MoCap) has become an integral tool in fields such as sports, medicine, and the entertainment industry. The cost of deploying high-end equipment and the lack of expertise and knowledge limit the usage of MoCap from its full potential, especially at beginner and intermediate levels of sports coaching. The challenges faced while develo...
Citation: Galpaya, C.; Induranga, A.; Vithanage, V.; Mantilaka, P.; Koswattage, K.R. Comparative Study on the Thermal Properties of Engine Oils and Their Nanofluids Incorporating Fullerene-C 60 , TiO 2 and Fe 2 O 3 at Different Temperatures. Energies 2024, 17, 732. https:// Abstract: The efficiency, durability, and overall performance of a car engi...
This study investigates the impact of incorporating TiO2 nanoparticles into two types of oils at different temperatures and with varying volume fractions: transformer oil (NYTRO LIBRA) and virgin coconut oil (manufactured by Govi Aruna Pvt. Ltd., Gampaha, Sri Lanka). The nanofluids were prepared using a two-step method by adding CTAB (cetyltrimethy...
Metal oxide nanoparticles have a significant impact on the properties of nanofluids and among all metal oxides Titanium dioxide (TiO2) has attracted research attention due to its remarkable properties. Where the TiO2 added nanofluids enhances the thermal properties of engine oil and thereby enhancing the engine performances. In this experimental wo...
Nanofluids are emerging as promising heat transfer fluids for the next generation cooling systems by providing impressive thermo-physical properties. Thermal conductivity stands out as a critical property that underscores the potential of nanofluids as alternative coolants for various industrial applications, including solar thermal collectors, HVA...
This study is based on a comprehensive analysis of a heating blower system using Computational Fluid Dynamics (CFD) with the Ansys 16 software platform. The system is designed to function as a heating system for a conveyor dryer. The heating blower system consists of a motor-coupled propeller with a 7.5-inch diameter, along with an electrically pow...
Molded paper pulp packaging products are gaining popularity around the globe as an environmentally friendly and sustainable alternative to plastic packaging products. In this research, the possibility of enhancing the paper pulp material is experimented with Sugarcane Bagasse Ash (SCBA) as a particulate strengthening additive. To study the impact o...
The study of Nanofluids is an emerging field in the 21st century. The notable thermal properties of nanofluids have attracted the attention of researchers in various scientific and engineering fields, such as mechanical, electrical, process, automobile, biomedical engineering, and biotechnology. This research study
investigates the thermal propert...
The increasing global demand for clean and sustainable power has led to the emergence of solar PV (Photovoltaic) as a transformative force. In line with this trend, the Sri Lankan power sector aims to achieve 70% of electricity generation through renewable energy sources, especially with the contribution of Solar PV systems. Researchers must invest...
This paper presents an energy analysis of the integration of bi-directional electric vehicle (EV) chargers for managing peak grid demand in Sri Lanka. This study addresses the challenges posed by peak demand and the way to address these issues with EV technology. The concept of bi-directional EV chargers is introduced, allowing EVs to both consume...
The efficiency, durability, and overall performance of a car engine are influenced by several critical factors. The quality and properties of engine oil play a crucial role, and oil is used in internal combustion engines for lubrication and cooling purposes. This research study aimed to compare the impact of fullerene-C60 (99.5%), Fe2O3, and TiO2 n...
We synthesised a polyaniline/mica (Mica–PANI) nanocomposite using naturally occurring muscovite mica by a top-down approach. The developed coating materials were characterised using a different technique to investigate their chemical and structural properties using Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning el...
Heat transfer fluids are used in various industrial systems to maintain them in perfect operating conditions. Extensive research efforts have been dedicated to enhance the thermal properties of these heat transfer fluids to improve their efficiency. Developing nanofluids is a potential candidate for such enhancements. This study investigates the im...
A UV, visible and NIR range irradiation responsive magnetite/graphite nanoplatelets composite was successfully synthesised via a single-step facile in-situ electrochemical exfoliation method using natural vein graphite. The spectral analysis revealed that as-synthesised photocatalytic could rapidly degrade the organic dyes with 96.1, 78.0 and 82.6...
Engine oils are used as coolants and lubricants in different types of vehicles with the aim of maintaining the temperature of the engine and reducing friction between parts and their abrasion. The thermal properties of engine oil are the key parameters when selecting engine oil for a vehicle. This study is carried out to compare the effect of Fulle...
The ideal climatic and environmental conditions for sugarcane cultivation are present all year round in the tropical island of Sri Lanka. Given the annual sugar consumption of the nation, a significant amount of sugarcane bagasse ash (SCBA), a by-product with no intended commercial use but potential environmental and health risks, is produced. Nume...
Nano-zirconia (ZO) was synthesized using a microwave-assisted one-pot precipitation route. Two biopolymers, chitosan (CTS) and carboxymethyl cellulose were blended with ZO at different w/w ratios. The formulation with 30% w/w chitosan (ZO-CTS) was found to give enhanced uptake of F⁻ and As(V). ZO and the most effective ZO-CTS system were characteri...
Fault detection in race-walking has been a topic of discussion each and every time a major sport event like Olympics is on display. Hence many attempts have been made accurately detect the bent knee and loss of contact during the event. Here we discuss a cost-effective method using graphical programming to accurately detect the loss of contact duri...
L-cysteine is one of the promising amino-acid that has drawn an immense interest in bio-electronics applications. Through multiple functional groups, it acts as a linker between proteins of biomolecules and metal electrodes of inorganic metals. Hence the interaction between metal and L-cysteine considered to be an area that a greater understanding...
L-cysteine has gained much attention as a versatile amino acid to create bioactive surfaces by assisting the bonding of proteins to metal surfaces. When L-cysteine interacts with metallic partners such as gold, silver and copper, the SH functional group is known to interact strongly with the metallic surface. The interaction of the L-cysteine with...
There have been many research efforts dedicated to improving the thermophysical
characteristics of heat transfer fluids by suspending nanoparticles in different
engineering fields. Various nanoparticles have been used in these research studies,
such as organic nanoparticles, metallic nanoparticles, and metal-oxide nanoparticles.
The presented r...
Leading sugar-producing nations have been generating high volumes of sugarcane bagasse ash (SCBA) as a by-product. SCBA has the potential to be used as a partial replacement for ordinary Portland cement (OPC) in concrete, from thereby, mitigating several adverse environmental effects of cement while keeping the cost of concrete low. The majority of...
L-cysteine is one of the most versatile biomolecules with a unique metal-binding ability. L-cysteine has an outstanding role in the bioelectronics field as a linker between proteins of biomolecules and metal electrodes of the inorganic metals through multiple functional groups. The interface electronic structures between L-cysteine with metals dese...
Sri Lanka has a free education system that gives access to higher education opportunities through the G.C.E. (Advanced Level) examination to a limited number of students. Students can choose their preferred university course if they have fulfilled the required minimum results for university admission. This paper discusses the general interests and...
The growing demand for water purification provided the initial momentum to produce lanthanide-incorporated nano-hydroxyapatite (HAP) such as HAP·CeO2, HAP·CeO2·La(OH)3 (2:1), and HAP·CeO2·La(OH)3 (3:2). These materials open avenues to remove fluoride and lead ions from contaminated water bodies effectively. Composites of HAP containing CeO2 and La(...
In this study, hydroxyapatite (HAP) nanocomposites were prepared with chitosan (HAP-CTS), carboxymethyl cellulose (HAP-CMC), alginate (HAP-ALG), and gelatin (HAP-GEL) using a simple wet chemical in situ precipitation method. The synthesized materials were characterized using scanning electron microscopy, Fourier transform infrared spectroscopy, X-r...
In this study, we investigated the spontaneous orientation polarization (SOP) in coevaporated films of polar and nonpolar molecules. SOP has been commonly observed in the evaporated films of organic light‐emitting diode materials, and it influences the device performances. However, the mechanism of the SOP formation is yet to be clarified. Herein,...
This paper presents a cost-effective energy-efficient Internet of Things (IoT) based device controlling system that can be used with minimum user interaction, in the case of operating any electrical device. The proposed prototype of "IoT Based Energy Efficient Smart Classroom" is implemented to reduce the wastage of electricity in a lecture hall in...
In cricket, ball pitching conditions vary depending on different geological locations in the world. These geological conditions mainly affect pace, bounce, and the seam of the ball. For example, Indian subcontinent pitches have a slower pace and bounce than the other locations in the world. They are known as slow pitches. Australia, England, and ev...
1) Background: Optical absorption cross-section-the absolute absorption intensity specific to each molecule-of nucleic acid bases enables us to estimate the reaction yields of DNA lesions induced by the exposure to not only photons but also ionizing radiations. However, it was unknown in the energy region exceeding~10 eV (wavelength <~120 nm). (2)...
Room-temperature phosphorescent (RTP) materials have been attracting tremendous interest, owing to their unique material characteristics and potential applications for state-of-the-art optoelectronic devices. Recently, we reported the synthesis and fundamental photophysical properties of new RTP materials based on benzil, i.e., fluorinated monobenz...
The way of using exercise equipment to generate electricity has attracted considerable research attention since the energy produced through such a human movement is clean, renewable and sustainable as well as which will be a solution for extraordinary increase in global energy demand. This study focuses on converting the mechanical energy released...
Room-temperature phosphorescent (RTP) materials have been attracted tremendous interest owing to their unique material characteristics and potential applications for state-of-the-art optoelectronic devices. Recently, we have reported a synthesis and fundamental photophysical properties of new RTP materials based on benzil, i.e., fluorinated monoben...
Spontaneous orientation polarization (SOP) has been frequently observed in the evaporated films of organic light‐emitting diode materials. Because SOP modifies the charge injection and the accumulation properties of the device, understanding and controlling SOP is crucial in optimizing the performance of the device. In this study, we investigated t...
Pure organic phosphorescent molecules are attractive alternatives to transition-metal-complex-based phosphores for biomedical and technological applications owing to their abundance and nontoxicity. This article discloses the design, synthesis, and photophysical properties of fluorinated benzil and bisbenzil derivatives as potential pure organic ro...
Pure organic phosphorescent molecules are attractive alternatives to transition metal complexes-based phosphores for biomedical and technological applications owing to their abundance and nontoxicity. This article discloses the design, synthesis, and photophysical property of fluorinated benzil and bisbenzil derivatives as potential pure organic ro...
Synchrotron radiation (SR), as a result of its high‐intensity, brilliant, monochromatic, and collimated beams, is becoming one of the most crucial components of research in various fields of materials science such as nanomaterials, biomaterials, and energy materials. SR‐based characterization methods can be employed to analyze different systems suc...
In this study, the formation of Ag–S bond was systematically elucidated by thickness‐dependent ultraviolet photoelectron spectroscopy (UPS) in order to understand the L‐cysteine interaction with silver surface. A clean Ag(111) as the model system for silver surface was used, and L‐cysteine films on silver substrate were formed by vacuum evaporation...
Satellite remote sensing is a powerful technique that could be employed to estimate geophysical parameters from the electromagnetic energy reflected or emitted from the Earth. Climate phenomenon monitoring and analysis is one of the major fields in satellite remote sensing application. Specifically, retrieving Land Surface Temperature (LST) using r...
Charge-carrier injection in organic electronics is critically influenced by the interface electronic states formed at the organic semiconducting thin films and metal electrode contacts. A practical solution for the issue is to form a charge-transfer (CT) state at the interfaces, which will produce a substantial density of gap states in the vicinity...
Although the contact electrification of insulating polymers has been widely used in various technologies, the mechanism of electrification is still not well understood and several models have been proposed to explain the mechanism. Some of the models assume the existence of bandgap states that can store or release electrons to charge the polymer; h...
Near edge X-ray absorption fine structure (NEXAFS) spectroscopy was performed to study the atomic deuterium (hydrogen) adsorption behavior on hexagonal boron nitride (h-BN) epitaxial thin film as a model system to BN nanomaterial. In this research work the B and N K-edge NEXAFS spectra were analyzed by density functional theory calculations with mo...
Well-defined monolayers with single-crystalline-like molecular arrangements of dinaphtho[2,3-b:2′,3′-f]thieno[3,2-b]-thiophene(DNTT) and picene, which are a new class of organic semiconductors with enhanced intermolecular interactions, were fabricated and characterized. Although both molecules initially form a loosely packed monolayer with flat-lyi...
L-cysteine, one of amino acids, is well known in the bioelectronics field as a linker between proteins and metal electrodes. The interface electronic structures between L-cysteine and metals are therefore very crucial because they dominate the charge carrier injection characteristics into such biological systems. However the interface electronic st...
Various bio-related processes are driven by electron transfer reactions. Therefore the electronic structures of bio-molecules in their living environment are keys of their functionalities. One significant example photosynthesis which has attracted much attention due to urgent necessity of clean energy source. In this study, we carried out photoelec...
Electronic structures of donor-acceptor hetero-interfaces are crucial for performance of organic solar cell devices. In the present study, a well-defined organic molecular interface of pentacene single crystal and C60 overlayer is elucidated by x-ray and ultraviolet photoelectron spectroscopy (XPS and UPS) and photoelectron yield spectroscopy (PYS)...
Surface-induced aromatic stabilization (SIAS), a recently proposed mechanism leading to a formation of charge-transfer (CT) states at organic/metal (O/M) interfaces [G. Heimel, et al., Nat. Chem.
5, 187 (2013)], was investigated for an aromatic hydrocarbon, diindenoperylene (DIP), by means of synchrotron radiation-based ultraviolet photoelectron s...