Pub Date : 2021-07-27DOI: 10.1109/MERCon52712.2021.9525651
N. L. Adihetty, Dinuka R Ratnasinghe, Muthuthanthrige L. C. Attygalle, Som Narayan, P. Jha
Three-dimensional (3D) halide perovskites as CH3NH3PbI3 (3D-MAPI) have shown high performance in the perovskite solar cells. However, deep defects due to lattice disorders in the 3D halide perovskite cause to limit the performance of the halide perovskite solar cells. We have numerically simulated and investigated the optimum deep defect density of the 3D-MAPI layer of the p-i-n solar cell model with the structure of Glass/ITO(TCO)/PEDOT: PSS(HTM)/i-2D-MAPI/i-3D-MAPI/i-2D-MAPI/PCBM(ETM)/Ag. Due to the degradation of the organic components under some environmental conditions, the Pb-based organic perovskite solar cells need protective films. This 2D-3D-2D perovskite solar cell has been modeled as a stable perovskite solar cell, by inserting thin 2D-MAPI layers on both sides of the 3D-MAPI to reduce the degradation and moisture issues. Using SCAPS-1D solar cell simulation software, the deep defect density in the 3D halide perovskite layer was optimized to obtain the best performance of the cell model. Our simulation results have indicated that the deep defect density of the 3D-MAPI layer should not exceed 1012cm−3 for high performance. Also, low dark saturation current density and low Shockley-Read-Hall (SRH) recombination current density were observed at the low deep defect density in the 3D-MAPI layer.
{"title":"The Effect of Deep Defects on the Efficiency Variation of CH3NH3PbI3 Perovskite Solar Cells","authors":"N. L. Adihetty, Dinuka R Ratnasinghe, Muthuthanthrige L. C. Attygalle, Som Narayan, P. Jha","doi":"10.1109/MERCon52712.2021.9525651","DOIUrl":"https://doi.org/10.1109/MERCon52712.2021.9525651","url":null,"abstract":"Three-dimensional (3D) halide perovskites as CH3NH3PbI3 (3D-MAPI) have shown high performance in the perovskite solar cells. However, deep defects due to lattice disorders in the 3D halide perovskite cause to limit the performance of the halide perovskite solar cells. We have numerically simulated and investigated the optimum deep defect density of the 3D-MAPI layer of the p-i-n solar cell model with the structure of Glass/ITO(TCO)/PEDOT: PSS(HTM)/i-2D-MAPI/i-3D-MAPI/i-2D-MAPI/PCBM(ETM)/Ag. Due to the degradation of the organic components under some environmental conditions, the Pb-based organic perovskite solar cells need protective films. This 2D-3D-2D perovskite solar cell has been modeled as a stable perovskite solar cell, by inserting thin 2D-MAPI layers on both sides of the 3D-MAPI to reduce the degradation and moisture issues. Using SCAPS-1D solar cell simulation software, the deep defect density in the 3D halide perovskite layer was optimized to obtain the best performance of the cell model. Our simulation results have indicated that the deep defect density of the 3D-MAPI layer should not exceed 1012cm−3 for high performance. Also, low dark saturation current density and low Shockley-Read-Hall (SRH) recombination current density were observed at the low deep defect density in the 3D-MAPI layer.","PeriodicalId":6855,"journal":{"name":"2021 Moratuwa Engineering Research Conference (MERCon)","volume":"34 1","pages":"659-663"},"PeriodicalIF":0.0,"publicationDate":"2021-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80351243","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-07-27DOI: 10.1109/MERCon52712.2021.9525742
E. Havisanth, S. Kulathilaka
Rainfall induced slopes failures are a very critical issue in Sri Lanka. Natural or cut slopes which remain stable during dry season due to prevalence of high matric suction undergo failure because of loss of matric suction and pore water pressure buildup. Capillary barrier cover system is a cost-effective system with natural soils that could minimize infiltration of rainwater. Capillary barriers are unsaturated cover system that functions in response to change in negative pore water pressure. This research on applicability of capillary barrier cover system on local Sri Lankan cut slopes with 15° slope angle was done through experimental studies and numerical verification of results using GeoStudio, 2012 SEEP/W software.
{"title":"Study on Effectiveness of Capillary Barrier in Reduction of Rainfall Infiltration on a 15° Slope","authors":"E. Havisanth, S. Kulathilaka","doi":"10.1109/MERCon52712.2021.9525742","DOIUrl":"https://doi.org/10.1109/MERCon52712.2021.9525742","url":null,"abstract":"Rainfall induced slopes failures are a very critical issue in Sri Lanka. Natural or cut slopes which remain stable during dry season due to prevalence of high matric suction undergo failure because of loss of matric suction and pore water pressure buildup. Capillary barrier cover system is a cost-effective system with natural soils that could minimize infiltration of rainwater. Capillary barriers are unsaturated cover system that functions in response to change in negative pore water pressure. This research on applicability of capillary barrier cover system on local Sri Lankan cut slopes with 15° slope angle was done through experimental studies and numerical verification of results using GeoStudio, 2012 SEEP/W software.","PeriodicalId":6855,"journal":{"name":"2021 Moratuwa Engineering Research Conference (MERCon)","volume":"24 1","pages":"19-24"},"PeriodicalIF":0.0,"publicationDate":"2021-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89862407","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-07-27DOI: 10.1109/MERCon52712.2021.9525729
I. Mahakalanda, R. D. S. Arunapriya
Transition from products to services and integrating services into core product offering are well documented in management literature. Here the focus is on the intra-firm operation and supply strategies from a backward integration perspective. The objective of this paper is to develop a smart resource sharing model to facilitate the intra-firm backward integration that enables inhouse manufacturing of selected number of mission critical products. This paper deploys a deterministic mixed integer linear programming model to reshape the current maintenance and repair servicing facility layout to integrate the reverse engineering-based component manufacturing in a naval organization. Analysis of results suggests that this transition involves establishment of a new set of operating policies on resource sharing and job scheduling as the entity relaxes its' service-dominant stance.
{"title":"An MILP-based Intra-firm Smart Resource Sharing Model","authors":"I. Mahakalanda, R. D. S. Arunapriya","doi":"10.1109/MERCon52712.2021.9525729","DOIUrl":"https://doi.org/10.1109/MERCon52712.2021.9525729","url":null,"abstract":"Transition from products to services and integrating services into core product offering are well documented in management literature. Here the focus is on the intra-firm operation and supply strategies from a backward integration perspective. The objective of this paper is to develop a smart resource sharing model to facilitate the intra-firm backward integration that enables inhouse manufacturing of selected number of mission critical products. This paper deploys a deterministic mixed integer linear programming model to reshape the current maintenance and repair servicing facility layout to integrate the reverse engineering-based component manufacturing in a naval organization. Analysis of results suggests that this transition involves establishment of a new set of operating policies on resource sharing and job scheduling as the entity relaxes its' service-dominant stance.","PeriodicalId":6855,"journal":{"name":"2021 Moratuwa Engineering Research Conference (MERCon)","volume":"171 1","pages":"119-123"},"PeriodicalIF":0.0,"publicationDate":"2021-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88110768","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-07-27DOI: 10.1109/MERCon52712.2021.9525638
Poornima Wanninayake, M. Rathnayake, D. Thushara, S. Gunawardena
Dilute sulfuric acid pretreatment was conducted to extract hemicellulose from rice straw at reduced temperatures (<100 °C), and the process was optimized using experimental design analysis with the response surface methodology. Fourier Transform Infrared Spectroscopy analysis was performed to verify the purity of recovered hemicellulose. Central composite design of experiments (DOE) was applied to develop a statistical model to identify the main effects and interaction effects of process parameters: acid concentration, reaction temperature, and reaction time. The proposed quadratic model showed a high adjusted determination coefficient (0.91) and Fischer's test value (22.4), indicating that the model is adequate to characterize the relationships among the process parameters and explain the variation observed in response. Acid concentration and reaction temperature have significant first order and quadratic effects on hemicellulose recovery. However, reaction time exhibited only a significant quadratic effect on hemicellulose recovery. The maximum hemicellulose yield (15.78%) was obtained at optimal conditions of 0.26 moldm−3 acid concentration, 98.1°C reaction temperature, and 30.48 min reaction time. In addition, residual analysis was carried out to check the adequacy of the proposed model.
{"title":"Optimization of Hemicellulose Recovery from Rice Straw for Biorefinery: Dilute Acid Pretreatment at Reduced Temperatures","authors":"Poornima Wanninayake, M. Rathnayake, D. Thushara, S. Gunawardena","doi":"10.1109/MERCon52712.2021.9525638","DOIUrl":"https://doi.org/10.1109/MERCon52712.2021.9525638","url":null,"abstract":"Dilute sulfuric acid pretreatment was conducted to extract hemicellulose from rice straw at reduced temperatures (<100 °C), and the process was optimized using experimental design analysis with the response surface methodology. Fourier Transform Infrared Spectroscopy analysis was performed to verify the purity of recovered hemicellulose. Central composite design of experiments (DOE) was applied to develop a statistical model to identify the main effects and interaction effects of process parameters: acid concentration, reaction temperature, and reaction time. The proposed quadratic model showed a high adjusted determination coefficient (0.91) and Fischer's test value (22.4), indicating that the model is adequate to characterize the relationships among the process parameters and explain the variation observed in response. Acid concentration and reaction temperature have significant first order and quadratic effects on hemicellulose recovery. However, reaction time exhibited only a significant quadratic effect on hemicellulose recovery. The maximum hemicellulose yield (15.78%) was obtained at optimal conditions of 0.26 moldm−3 acid concentration, 98.1°C reaction temperature, and 30.48 min reaction time. In addition, residual analysis was carried out to check the adequacy of the proposed model.","PeriodicalId":6855,"journal":{"name":"2021 Moratuwa Engineering Research Conference (MERCon)","volume":"57 1","pages":"315-320"},"PeriodicalIF":0.0,"publicationDate":"2021-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72674425","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-07-27DOI: 10.1109/MERCon52712.2021.9525649
Lwur Dilrukshi, G. De Silva
This work focused on presenting an interpretation for the effect of precipitate size distribution on hardness and strength of the aluminum 6063 extrudates produced in local industry. The same heat treatment process applied in the local industry comprising solution treatment: keeping at 530°C for 4 hours, followed by age hardening treatment: keeping at 205°C for 150 minutes and air cooling, was carried out at laboratory scale. The average hardness and strength of heat-treated samples were measured as 66.5 HV and 210.5 MPa, respectively. Scanning Electron Microscopy - Energy Dispersive X-ray Spectroscopy (SEM/EDS) examination showed that secondary phase precipitates formed during this aging treatment belong to two types of precipitates, they are Silicon-Iron rich and Magnesium-Silicon-Iron rich precipitates. The average number of precipitates, precipitate size and area covered by precipitates were calculated by Image J software. Percentages of precipitates belong to three different size ranges were analyzed as 50.10 percent, 45.13 percent, and 4.77 percent for $0.0-0.2 mu mathrm{m}, 0.2-1.5 mu mathrm{m}$ and above $1.5 mu mathrm{m}$, respectively. The present work can be extended towards the development of a mathematical model to relate the ageing parameters and precipitate size distribution to hardness and strength of Al 6063 extrudates.
本文着重对国内工业生产的6063铝型材的析出相尺寸分布对其硬度和强度的影响进行了解释。在实验室规模上进行了与当地工业相同的热处理工艺，包括固溶处理:在530°C下保持4小时，然后进行时效硬化处理:在205°C下保持150分钟并进行空气冷却。热处理后试样的平均硬度和强度分别为66.5 HV和210.5 MPa。扫描电镜-能量色散x射线能谱(SEM/EDS)分析表明，时效过程中形成的二次相析出物属于富硅铁和富镁硅铁两种析出物。通过Image J软件计算平均析出相数、析出相尺寸和析出相覆盖面积。在$0.0 ~ 0.2 mu mathm {m}$、0.2 ~ 1.5 mu mathm {m}$和$1.5 mu mathm {m}$以上三个不同粒径范围内，析出物的比例分别为50.10%、45.13%和4.77%。目前的工作可以扩展到建立一个数学模型，将时效参数和析出物尺寸分布与Al 6063挤出物的硬度和强度联系起来。
{"title":"An Investigation of the Effect of Precipitate Size Distribution on Mechanical Properties of Aluminum 6063 Extrudates used for Window Frames","authors":"Lwur Dilrukshi, G. De Silva","doi":"10.1109/MERCon52712.2021.9525649","DOIUrl":"https://doi.org/10.1109/MERCon52712.2021.9525649","url":null,"abstract":"This work focused on presenting an interpretation for the effect of precipitate size distribution on hardness and strength of the aluminum 6063 extrudates produced in local industry. The same heat treatment process applied in the local industry comprising solution treatment: keeping at 530°C for 4 hours, followed by age hardening treatment: keeping at 205°C for 150 minutes and air cooling, was carried out at laboratory scale. The average hardness and strength of heat-treated samples were measured as 66.5 HV and 210.5 MPa, respectively. Scanning Electron Microscopy - Energy Dispersive X-ray Spectroscopy (SEM/EDS) examination showed that secondary phase precipitates formed during this aging treatment belong to two types of precipitates, they are Silicon-Iron rich and Magnesium-Silicon-Iron rich precipitates. The average number of precipitates, precipitate size and area covered by precipitates were calculated by Image J software. Percentages of precipitates belong to three different size ranges were analyzed as 50.10 percent, 45.13 percent, and 4.77 percent for $0.0-0.2 mu mathrm{m}, 0.2-1.5 mu mathrm{m}$ and above $1.5 mu mathrm{m}$, respectively. The present work can be extended towards the development of a mathematical model to relate the ageing parameters and precipitate size distribution to hardness and strength of Al 6063 extrudates.","PeriodicalId":6855,"journal":{"name":"2021 Moratuwa Engineering Research Conference (MERCon)","volume":"80 1","pages":"676-680"},"PeriodicalIF":0.0,"publicationDate":"2021-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77364486","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-07-27DOI: 10.1109/MERCon52712.2021.9525672
M.A.T.C . Perera, Kasun Muthunayaka, D. Madushanka, V. C. Liyanaarachchi, M. Premaratne, T. Ariyadasa
The complicated and varying weather conditions and contamination from fungi, protozoa, and bacteria are major problems associated with outdoor microalgae cultivation. In this study, outdoor microalgae cultivation was investigated in a 3.2 L vertical tubular photobioreactor in Moratuwa, Sri Lanka. During December, when both the solar irradiation and temperature were high, the water spray system in combination with two agro shading nets (each with a shading rate of 40-50%) could effectively reduce the temperature to $2 pm 2 {}^{0}mathrm{C}$ and control solar irradiation below 13500 lux. Under an initial biomass density of 0.2875 g/L and an atmospheric air flow rate of 1 vvm, Haematococcus pluvialis showcased a maximum biomass accumulation of 0.45 g/L and the maximum productivity of 20 mg/L/day. In addition, the reactor system and its design exhibited good performance, implying a potential scale-up opportunity. However, operation under outdoor conditions showed slightly poorer performance due to the light inhibition effect.
{"title":"Investigation of the Effect of Solar Irradiation and Temperature on H. pluvialis Production in Photobioreactors Under Outdoor Cultivation in Sri Lanka","authors":"M.A.T.C . Perera, Kasun Muthunayaka, D. Madushanka, V. C. Liyanaarachchi, M. Premaratne, T. Ariyadasa","doi":"10.1109/MERCon52712.2021.9525672","DOIUrl":"https://doi.org/10.1109/MERCon52712.2021.9525672","url":null,"abstract":"The complicated and varying weather conditions and contamination from fungi, protozoa, and bacteria are major problems associated with outdoor microalgae cultivation. In this study, outdoor microalgae cultivation was investigated in a 3.2 L vertical tubular photobioreactor in Moratuwa, Sri Lanka. During December, when both the solar irradiation and temperature were high, the water spray system in combination with two agro shading nets (each with a shading rate of 40-50%) could effectively reduce the temperature to $2 pm 2 {}^{0}mathrm{C}$ and control solar irradiation below 13500 lux. Under an initial biomass density of 0.2875 g/L and an atmospheric air flow rate of 1 vvm, Haematococcus pluvialis showcased a maximum biomass accumulation of 0.45 g/L and the maximum productivity of 20 mg/L/day. In addition, the reactor system and its design exhibited good performance, implying a potential scale-up opportunity. However, operation under outdoor conditions showed slightly poorer performance due to the light inhibition effect.","PeriodicalId":6855,"journal":{"name":"2021 Moratuwa Engineering Research Conference (MERCon)","volume":"1 1","pages":"327-332"},"PeriodicalIF":0.0,"publicationDate":"2021-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90899162","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-07-27DOI: 10.1109/MERCon52712.2021.9525643
P.M.P. Udayakantha, W. Jayantha, W. Mampearachchi
The road construction sector is dealing with ever depleting construction material problems, especially the availability of good quality aggregate has become more challenging for road projects over the past few years. The accelerated development demands many natural resources, and the extraction of resources like aggregate on a mass-scale also poses a significant threat to the environment. Using the available resources sparingly and optimally is the way forward to brace the scarcity of construction material, which we are about to face. There are many projects in progress to upgrade low-volume roads. But the designs are carried out using a 50mm asphalt wearing course, which is a conservative approach given the traffic movements of the roads are very much limited. For the traffic levels in such roads, using a thin asphalt layer between 25mm–35mm, the same design life could be achieved while cutting down construction costs for the pavement significantly. The study aims to adopt a mix that can be laid in thin layers, which will perform well in low traffic conditions.
{"title":"Use of Glass Fibers in Thin Lift Stone Mastic Asphalt (SMA) Production for Low Volume Roads","authors":"P.M.P. Udayakantha, W. Jayantha, W. Mampearachchi","doi":"10.1109/MERCon52712.2021.9525643","DOIUrl":"https://doi.org/10.1109/MERCon52712.2021.9525643","url":null,"abstract":"The road construction sector is dealing with ever depleting construction material problems, especially the availability of good quality aggregate has become more challenging for road projects over the past few years. The accelerated development demands many natural resources, and the extraction of resources like aggregate on a mass-scale also poses a significant threat to the environment. Using the available resources sparingly and optimally is the way forward to brace the scarcity of construction material, which we are about to face. There are many projects in progress to upgrade low-volume roads. But the designs are carried out using a 50mm asphalt wearing course, which is a conservative approach given the traffic movements of the roads are very much limited. For the traffic levels in such roads, using a thin asphalt layer between 25mm–35mm, the same design life could be achieved while cutting down construction costs for the pavement significantly. The study aims to adopt a mix that can be laid in thin layers, which will perform well in low traffic conditions.","PeriodicalId":6855,"journal":{"name":"2021 Moratuwa Engineering Research Conference (MERCon)","volume":"23 1","pages":"498-503"},"PeriodicalIF":0.0,"publicationDate":"2021-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73899439","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-07-27DOI: 10.1109/MERCon52712.2021.9525675
K. Anjana, Duan Deshan, D.S. Haputhanthrie, I. Nissanka
With the growing interest in renewable energy, sea waves are considered as an energy source with a high potential for power generation. Sri Lanka being an island surrounded by the sea with about 1300 km long coastal belt, the country holds a theoretical potential of generating a significant amount of power for the national grid from wave energy conversion. Hence this research is focused on the analysis of an improved wave energy convertor which suits Sri Lankan coastal weather conditions. Analysis was conducted based on the wave patterns in the coastal belt to identify the most suitable places to implement wave energy converters. A comparison of existing wave energy conversion technologies and computation simulations were conducted to identify suitable technology for the local wave conditions. The study revealed that the point absorber type wave energy converter was the best solution compatible with wave conditions for the selected coastal region. Buoy geometry of the point absorber was analyzed using computational simulations to select the best geometry. The simulation results showed that the half capsule shape produced the highest force extraction compared to the other shapes.
{"title":"Simulation-Based Approach in Selecting a Wave Energy Converter for Sri Lankan Wave Conditions","authors":"K. Anjana, Duan Deshan, D.S. Haputhanthrie, I. Nissanka","doi":"10.1109/MERCon52712.2021.9525675","DOIUrl":"https://doi.org/10.1109/MERCon52712.2021.9525675","url":null,"abstract":"With the growing interest in renewable energy, sea waves are considered as an energy source with a high potential for power generation. Sri Lanka being an island surrounded by the sea with about 1300 km long coastal belt, the country holds a theoretical potential of generating a significant amount of power for the national grid from wave energy conversion. Hence this research is focused on the analysis of an improved wave energy convertor which suits Sri Lankan coastal weather conditions. Analysis was conducted based on the wave patterns in the coastal belt to identify the most suitable places to implement wave energy converters. A comparison of existing wave energy conversion technologies and computation simulations were conducted to identify suitable technology for the local wave conditions. The study revealed that the point absorber type wave energy converter was the best solution compatible with wave conditions for the selected coastal region. Buoy geometry of the point absorber was analyzed using computational simulations to select the best geometry. The simulation results showed that the half capsule shape produced the highest force extraction compared to the other shapes.","PeriodicalId":6855,"journal":{"name":"2021 Moratuwa Engineering Research Conference (MERCon)","volume":"35 1","pages":"245-250"},"PeriodicalIF":0.0,"publicationDate":"2021-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73676480","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-07-27DOI: 10.1109/MERCon52712.2021.9525783
A. Ratnakumar, A. Samarasekara, D. Amarasinghe, L. Karunanayake
Rice is one of the major cereal crops cultivated globally. In the recent past, rice straw has gained momentum as a source of cellulose. However, it is notable that rice straw generated from rice cultivation has less or no commercial value. In this study, microfibrillated cellulose (MFC) was extracted from Sri Lankan traditional rice straw variety Pachaperumal and hybrid variety BG352 in two distinct stages. Initially, a series of chemical treatment methods that includes removal of wax and oil, lignin, hemicellulose and silica was employed to extract cellulose fibers from the aforementioned rice straw varieties. Then, using high-intensity ultrasonication (HIUS) process microfibrillated cellulose (MFC) was isolated from the obtained chemically extracted cellulose fibers. FTIR analysis validated that the chemical composition of MFC from both varieties were mainly cellulose where hemicelluloses and lignin were successfully removed during the set of chemical processes. Study revealed that around 34 per cent cellulose was extracted from Pachaperumal and around 25 per cent cellulose was extracted from BG352. Out of these chemically extracted cellulose fibers around 16 per cent of MFC was disintegrated from Pachaperumal and around 9 per cent from BG352 via HIUS process. SEM analysis showed that the diameters of the MFC were in 200 to 300 nanometer range Results indicated that traditional variety yielded high amount of MFC than technically modified variety via the efficient multi-step treatment process with potential industrial applications.
{"title":"Microfibrillated Cellulose Fabrication and Characterization from Sri Lankan Rice Straw: A Comparison between Traditional and Hybrid Variety","authors":"A. Ratnakumar, A. Samarasekara, D. Amarasinghe, L. Karunanayake","doi":"10.1109/MERCon52712.2021.9525783","DOIUrl":"https://doi.org/10.1109/MERCon52712.2021.9525783","url":null,"abstract":"Rice is one of the major cereal crops cultivated globally. In the recent past, rice straw has gained momentum as a source of cellulose. However, it is notable that rice straw generated from rice cultivation has less or no commercial value. In this study, microfibrillated cellulose (MFC) was extracted from Sri Lankan traditional rice straw variety Pachaperumal and hybrid variety BG352 in two distinct stages. Initially, a series of chemical treatment methods that includes removal of wax and oil, lignin, hemicellulose and silica was employed to extract cellulose fibers from the aforementioned rice straw varieties. Then, using high-intensity ultrasonication (HIUS) process microfibrillated cellulose (MFC) was isolated from the obtained chemically extracted cellulose fibers. FTIR analysis validated that the chemical composition of MFC from both varieties were mainly cellulose where hemicelluloses and lignin were successfully removed during the set of chemical processes. Study revealed that around 34 per cent cellulose was extracted from Pachaperumal and around 25 per cent cellulose was extracted from BG352. Out of these chemically extracted cellulose fibers around 16 per cent of MFC was disintegrated from Pachaperumal and around 9 per cent from BG352 via HIUS process. SEM analysis showed that the diameters of the MFC were in 200 to 300 nanometer range Results indicated that traditional variety yielded high amount of MFC than technically modified variety via the efficient multi-step treatment process with potential industrial applications.","PeriodicalId":6855,"journal":{"name":"2021 Moratuwa Engineering Research Conference (MERCon)","volume":"59 1","pages":"164-168"},"PeriodicalIF":0.0,"publicationDate":"2021-07-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78176843","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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