The Experts below are selected from a list of 24411 Experts worldwide ranked by ideXlab platform
J A Labrincha - One of the best experts on this subject based on the ideXlab platform.
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novel biomass fly ash based geopolymeric mortars using lime slaker grits as aggregate for applications in construction influence of granulometry and binder aggregate ratio
Construction and Building Materials, 2019Co-Authors: Manfredi Saeli, L Senff, D M Tobaldi, M P Seabra, J A LabrinchaAbstract:Abstract This work discusses the influence of the aggregate granulometry and the binder/aggregate ratio on the engineering properties of novel green geopolymeric mortars. Two wastes generated by a Portuguese Kraft Pulp Industry are employed to manufacture the material: lime slaker grits (used as aggregate) and biomass fly ash (to partially replace the metakaolin − 70 wt% substitution). The novel geopolymeric mortars could find innovative applications as sustainable construction materials. The studied mix design foresees the use of several grits granulometric ranges and ratios binder/aggregate to discuss workability, water sorptivity, and mechanical performance of the novel mortars. To date, these factors are fairly unknown in geopolymeric materials. The raw materials are also characterized. The main results demonstrate that the formulated geopolymeric mortars can be efficaciously used for masonry application in construction and predict potentialities and limits. Reuse of such wastes will increase the sustainability of the novel construction materials also granting a financial surplus for the Industry. Furthermore, manufacture and curing are conducted at ambient conditions (20 °C, 65% RH), avoiding any external source of energy, and involve a simple, reproducible, and low-cost process.
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innovative recycling of lime slaker grits from paper Pulp Industry reused as aggregate in ambient cured biomass fly ash based geopolymers for sustainable construction material
Sustainability, 2019Co-Authors: Manfredi Saeli, L Senff, D M Tobaldi, Giada La Scalia, M P Seabra, J A LabrinchaAbstract:Lime slaker grits and biomass fly ash are solid wastes produced by the Kraft paper-Pulp Industry that are commonly disposed of in landfill. However, recent studies and European regulations discourage such disposal practices. This work investigates an alternative and innovative way to recycle and reuse these wastes in the production of green geopolymeric mortars intended for application in the construction Industry. Here, biomass fly ash was used as the main source of alumino-silicate in the binder precursor (70 wt.% substitution to metakaolin), and grits (ranging from 1–12.5 mm, as provided by the Industry) were reused as aggregate. Aggregate granulometry was also completed by using a commercial natural siliceous sand (<1 mm). Mortars using sand only were prepared for comparative reasons. The implemented mix was designed to investigate the influence of the grits on the mortar’s properties such as its binder/aggregate ratio, workability, bulk density, water sorptivity, and compressive strength. At the same time, waste reuse was analysed in light of its limitations and potentialities. Moreover, in the pursuit of sustainability, the manufacturing process that was followed was highly cost-effective in ambient curing conditions (20 °C, 65% RH), which avoided the use of any external source of energy as commonly used in geopolymers processing. The achieved results proved that the combined use of these wastes, which to date has hardly been explored, along with ambient manufacturing conditions increases the material sustainability. The produced mortars are suitable for innovative applications in various fields, with a particular focus on construction and contribute to the circular economy.
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mix design and mechanical performance of geopolymeric binders and mortars using biomass fly ash and alkaline effluent from paper Pulp Industry
Journal of Cleaner Production, 2019Co-Authors: Manfredi Saeli, D M Tobaldi, M P Seabra, J A LabrinchaAbstract:Abstract This work investigates the use of biomass fly ash (BFA) and an alkaline effluent (AEF), both generated from the Kraft Pulp Industry, in the preparation of geopolymeric binders and mortars for construction applications. BFA replaced the metakaolin (MK) while the AEF substituted the distilled water used to dissolve NaOH pellets. The mix design aims to maximize the amount of both the wastes and to optimize the materials properties, such as workability and mechanical performance. At the same time, also the environmental impact decreases enhancing the materials' sustainability and facilitating the circular economy. For the previously optimized BFA/MK ratio (70/30 wt.%) several NaOH/Na2SiO3 ratios and water to AEF substitutions were tested. The best performance was achieved for the alkaline activator having one part of NaOH and three parts of Na2SiO3. According to the main results, the biologic AEF can totally replace the distilled water in the NaOH preparation. Thus will increase the sustainability of the novel materials. Subsequently, the optimized binder was used – with and without AEF - to manufacture mortars with various binder/aggregate ratios. It is concluded that the formulations with a binder/aggregate mass proportion of 1:3 showed the best mechanical performance (compressive strength surpassing 20 MPa, class M20) and the replacement of distilled water with AEF did not affect the specimens final properties, but enhance the materials sustainability. Furthermore, in the pursuit of sustainability, manufacture and curing were conducted at ambient conditions (20 °C, 65% RH), avoiding any external source of energy, involving simple, reproducible, and low-cost processes.
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preparation of clinker from paper Pulp Industry wastes
Journal of Hazardous Materials, 2015Co-Authors: L H Buruberri, M P Seabra, J A LabrinchaAbstract:Abstract The production of paper Pulp by the Kraft method generates considerable amounts of wastes. Namely, lime mud generated in the recovery circuit of chemical reagents, biological sludge from the wastewater treatment of wood digestion process and fly ash collected in the fluidized bed combustor used to generate electricity from biomass burning. The final destination of such wastes is an important concern, since environmental regulations are becoming stricter regarding their landfill. Driven by this fact, industries are looking for more sustainable solutions, such as the recycling in distinct products. This work tested these wastes as secondary raw materials to produce clinker/cement that was then experienced in mortar formulations. The first step involved the residues detailed characterization and a generated amounts survey. Then, specific but simple steps were suggested, aiming to facilitate transport and manipulation. Distinct blends were prepared and fired in order to get belitic and Portland clinkers. The Portland clinkers were processed at lower temperatures than the normally used in the Industry due to the presence of mineralizing impurities in some wastes. Belite-based cements were used to produce mortars that developed satisfactory mechanical strength and did not reveal signs of deterioration or durability weaknesses.
Manfredi Saeli - One of the best experts on this subject based on the ideXlab platform.
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novel biomass fly ash based geopolymeric mortars using lime slaker grits as aggregate for applications in construction influence of granulometry and binder aggregate ratio
Construction and Building Materials, 2019Co-Authors: Manfredi Saeli, L Senff, D M Tobaldi, M P Seabra, J A LabrinchaAbstract:Abstract This work discusses the influence of the aggregate granulometry and the binder/aggregate ratio on the engineering properties of novel green geopolymeric mortars. Two wastes generated by a Portuguese Kraft Pulp Industry are employed to manufacture the material: lime slaker grits (used as aggregate) and biomass fly ash (to partially replace the metakaolin − 70 wt% substitution). The novel geopolymeric mortars could find innovative applications as sustainable construction materials. The studied mix design foresees the use of several grits granulometric ranges and ratios binder/aggregate to discuss workability, water sorptivity, and mechanical performance of the novel mortars. To date, these factors are fairly unknown in geopolymeric materials. The raw materials are also characterized. The main results demonstrate that the formulated geopolymeric mortars can be efficaciously used for masonry application in construction and predict potentialities and limits. Reuse of such wastes will increase the sustainability of the novel construction materials also granting a financial surplus for the Industry. Furthermore, manufacture and curing are conducted at ambient conditions (20 °C, 65% RH), avoiding any external source of energy, and involve a simple, reproducible, and low-cost process.
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innovative recycling of lime slaker grits from paper Pulp Industry reused as aggregate in ambient cured biomass fly ash based geopolymers for sustainable construction material
Sustainability, 2019Co-Authors: Manfredi Saeli, L Senff, D M Tobaldi, Giada La Scalia, M P Seabra, J A LabrinchaAbstract:Lime slaker grits and biomass fly ash are solid wastes produced by the Kraft paper-Pulp Industry that are commonly disposed of in landfill. However, recent studies and European regulations discourage such disposal practices. This work investigates an alternative and innovative way to recycle and reuse these wastes in the production of green geopolymeric mortars intended for application in the construction Industry. Here, biomass fly ash was used as the main source of alumino-silicate in the binder precursor (70 wt.% substitution to metakaolin), and grits (ranging from 1–12.5 mm, as provided by the Industry) were reused as aggregate. Aggregate granulometry was also completed by using a commercial natural siliceous sand (<1 mm). Mortars using sand only were prepared for comparative reasons. The implemented mix was designed to investigate the influence of the grits on the mortar’s properties such as its binder/aggregate ratio, workability, bulk density, water sorptivity, and compressive strength. At the same time, waste reuse was analysed in light of its limitations and potentialities. Moreover, in the pursuit of sustainability, the manufacturing process that was followed was highly cost-effective in ambient curing conditions (20 °C, 65% RH), which avoided the use of any external source of energy as commonly used in geopolymers processing. The achieved results proved that the combined use of these wastes, which to date has hardly been explored, along with ambient manufacturing conditions increases the material sustainability. The produced mortars are suitable for innovative applications in various fields, with a particular focus on construction and contribute to the circular economy.
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mix design and mechanical performance of geopolymeric binders and mortars using biomass fly ash and alkaline effluent from paper Pulp Industry
Journal of Cleaner Production, 2019Co-Authors: Manfredi Saeli, D M Tobaldi, M P Seabra, J A LabrinchaAbstract:Abstract This work investigates the use of biomass fly ash (BFA) and an alkaline effluent (AEF), both generated from the Kraft Pulp Industry, in the preparation of geopolymeric binders and mortars for construction applications. BFA replaced the metakaolin (MK) while the AEF substituted the distilled water used to dissolve NaOH pellets. The mix design aims to maximize the amount of both the wastes and to optimize the materials properties, such as workability and mechanical performance. At the same time, also the environmental impact decreases enhancing the materials' sustainability and facilitating the circular economy. For the previously optimized BFA/MK ratio (70/30 wt.%) several NaOH/Na2SiO3 ratios and water to AEF substitutions were tested. The best performance was achieved for the alkaline activator having one part of NaOH and three parts of Na2SiO3. According to the main results, the biologic AEF can totally replace the distilled water in the NaOH preparation. Thus will increase the sustainability of the novel materials. Subsequently, the optimized binder was used – with and without AEF - to manufacture mortars with various binder/aggregate ratios. It is concluded that the formulations with a binder/aggregate mass proportion of 1:3 showed the best mechanical performance (compressive strength surpassing 20 MPa, class M20) and the replacement of distilled water with AEF did not affect the specimens final properties, but enhance the materials sustainability. Furthermore, in the pursuit of sustainability, manufacture and curing were conducted at ambient conditions (20 °C, 65% RH), avoiding any external source of energy, involving simple, reproducible, and low-cost processes.
M P Seabra - One of the best experts on this subject based on the ideXlab platform.
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Unexplored alternative use of calcareous sludge from the paper-Pulp Industry in green geopolymer construction materials
'Elsevier BV', 2020Co-Authors: Saeli Manfredi, D M Tobaldi, Senff L., Carvalheiras J, M P SeabraAbstract:Calcareous sludge is an alkaline waste produced by the paper Pulp Industry that is commonly disposed of in land-fill. However, recent studies and the European regulations discourage such practice. This work investigates an alternative and innovative way to recycle and reuse this waste, as filler, in the production of green geopolymeric mortars intended for applications in construction. This is the first time that this calcareous sludge is used to produce novel waste-based materials, in both construction and geopolymer technology. The novel alkali-activated mortar also uses biomass fly ash \u2013 another slightly investigated waste stream \u2013 to substitute the metakaolin (70 wt% substitution) and the manufacture process is performed at ambient conditions. All of that reduces the overall process footprint. The implemented mix design is aimed at maximising the waste incorporation and improving the material properties, such as workability and mechanical performance. The main results demonstrate that 10 wt% of calcareous sludge can be efficaciously used as filler in the geopolymeric mortars, generating up to 30% improvement in the mechanical resistance. This alternative use of such wastes will contribute to increase the sustainability of the novel construction materials also granting environmental advantages and a financial surplus for the Industry
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novel biomass fly ash based geopolymeric mortars using lime slaker grits as aggregate for applications in construction influence of granulometry and binder aggregate ratio
Construction and Building Materials, 2019Co-Authors: Manfredi Saeli, L Senff, D M Tobaldi, M P Seabra, J A LabrinchaAbstract:Abstract This work discusses the influence of the aggregate granulometry and the binder/aggregate ratio on the engineering properties of novel green geopolymeric mortars. Two wastes generated by a Portuguese Kraft Pulp Industry are employed to manufacture the material: lime slaker grits (used as aggregate) and biomass fly ash (to partially replace the metakaolin − 70 wt% substitution). The novel geopolymeric mortars could find innovative applications as sustainable construction materials. The studied mix design foresees the use of several grits granulometric ranges and ratios binder/aggregate to discuss workability, water sorptivity, and mechanical performance of the novel mortars. To date, these factors are fairly unknown in geopolymeric materials. The raw materials are also characterized. The main results demonstrate that the formulated geopolymeric mortars can be efficaciously used for masonry application in construction and predict potentialities and limits. Reuse of such wastes will increase the sustainability of the novel construction materials also granting a financial surplus for the Industry. Furthermore, manufacture and curing are conducted at ambient conditions (20 °C, 65% RH), avoiding any external source of energy, and involve a simple, reproducible, and low-cost process.
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innovative recycling of lime slaker grits from paper Pulp Industry reused as aggregate in ambient cured biomass fly ash based geopolymers for sustainable construction material
Sustainability, 2019Co-Authors: Manfredi Saeli, L Senff, D M Tobaldi, Giada La Scalia, M P Seabra, J A LabrinchaAbstract:Lime slaker grits and biomass fly ash are solid wastes produced by the Kraft paper-Pulp Industry that are commonly disposed of in landfill. However, recent studies and European regulations discourage such disposal practices. This work investigates an alternative and innovative way to recycle and reuse these wastes in the production of green geopolymeric mortars intended for application in the construction Industry. Here, biomass fly ash was used as the main source of alumino-silicate in the binder precursor (70 wt.% substitution to metakaolin), and grits (ranging from 1–12.5 mm, as provided by the Industry) were reused as aggregate. Aggregate granulometry was also completed by using a commercial natural siliceous sand (<1 mm). Mortars using sand only were prepared for comparative reasons. The implemented mix was designed to investigate the influence of the grits on the mortar’s properties such as its binder/aggregate ratio, workability, bulk density, water sorptivity, and compressive strength. At the same time, waste reuse was analysed in light of its limitations and potentialities. Moreover, in the pursuit of sustainability, the manufacturing process that was followed was highly cost-effective in ambient curing conditions (20 °C, 65% RH), which avoided the use of any external source of energy as commonly used in geopolymers processing. The achieved results proved that the combined use of these wastes, which to date has hardly been explored, along with ambient manufacturing conditions increases the material sustainability. The produced mortars are suitable for innovative applications in various fields, with a particular focus on construction and contribute to the circular economy.
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mix design and mechanical performance of geopolymeric binders and mortars using biomass fly ash and alkaline effluent from paper Pulp Industry
Journal of Cleaner Production, 2019Co-Authors: Manfredi Saeli, D M Tobaldi, M P Seabra, J A LabrinchaAbstract:Abstract This work investigates the use of biomass fly ash (BFA) and an alkaline effluent (AEF), both generated from the Kraft Pulp Industry, in the preparation of geopolymeric binders and mortars for construction applications. BFA replaced the metakaolin (MK) while the AEF substituted the distilled water used to dissolve NaOH pellets. The mix design aims to maximize the amount of both the wastes and to optimize the materials properties, such as workability and mechanical performance. At the same time, also the environmental impact decreases enhancing the materials' sustainability and facilitating the circular economy. For the previously optimized BFA/MK ratio (70/30 wt.%) several NaOH/Na2SiO3 ratios and water to AEF substitutions were tested. The best performance was achieved for the alkaline activator having one part of NaOH and three parts of Na2SiO3. According to the main results, the biologic AEF can totally replace the distilled water in the NaOH preparation. Thus will increase the sustainability of the novel materials. Subsequently, the optimized binder was used – with and without AEF - to manufacture mortars with various binder/aggregate ratios. It is concluded that the formulations with a binder/aggregate mass proportion of 1:3 showed the best mechanical performance (compressive strength surpassing 20 MPa, class M20) and the replacement of distilled water with AEF did not affect the specimens final properties, but enhance the materials sustainability. Furthermore, in the pursuit of sustainability, manufacture and curing were conducted at ambient conditions (20 °C, 65% RH), avoiding any external source of energy, involving simple, reproducible, and low-cost processes.
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preparation of clinker from paper Pulp Industry wastes
Journal of Hazardous Materials, 2015Co-Authors: L H Buruberri, M P Seabra, J A LabrinchaAbstract:Abstract The production of paper Pulp by the Kraft method generates considerable amounts of wastes. Namely, lime mud generated in the recovery circuit of chemical reagents, biological sludge from the wastewater treatment of wood digestion process and fly ash collected in the fluidized bed combustor used to generate electricity from biomass burning. The final destination of such wastes is an important concern, since environmental regulations are becoming stricter regarding their landfill. Driven by this fact, industries are looking for more sustainable solutions, such as the recycling in distinct products. This work tested these wastes as secondary raw materials to produce clinker/cement that was then experienced in mortar formulations. The first step involved the residues detailed characterization and a generated amounts survey. Then, specific but simple steps were suggested, aiming to facilitate transport and manipulation. Distinct blends were prepared and fired in order to get belitic and Portland clinkers. The Portland clinkers were processed at lower temperatures than the normally used in the Industry due to the presence of mineralizing impurities in some wastes. Belite-based cements were used to produce mortars that developed satisfactory mechanical strength and did not reveal signs of deterioration or durability weaknesses.
D M Tobaldi - One of the best experts on this subject based on the ideXlab platform.
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Unexplored alternative use of calcareous sludge from the paper-Pulp Industry in green geopolymer construction materials
'Elsevier BV', 2020Co-Authors: Saeli Manfredi, D M Tobaldi, Senff L., Carvalheiras J, M P SeabraAbstract:Calcareous sludge is an alkaline waste produced by the paper Pulp Industry that is commonly disposed of in land-fill. However, recent studies and the European regulations discourage such practice. This work investigates an alternative and innovative way to recycle and reuse this waste, as filler, in the production of green geopolymeric mortars intended for applications in construction. This is the first time that this calcareous sludge is used to produce novel waste-based materials, in both construction and geopolymer technology. The novel alkali-activated mortar also uses biomass fly ash \u2013 another slightly investigated waste stream \u2013 to substitute the metakaolin (70 wt% substitution) and the manufacture process is performed at ambient conditions. All of that reduces the overall process footprint. The implemented mix design is aimed at maximising the waste incorporation and improving the material properties, such as workability and mechanical performance. The main results demonstrate that 10 wt% of calcareous sludge can be efficaciously used as filler in the geopolymeric mortars, generating up to 30% improvement in the mechanical resistance. This alternative use of such wastes will contribute to increase the sustainability of the novel construction materials also granting environmental advantages and a financial surplus for the Industry
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novel biomass fly ash based geopolymeric mortars using lime slaker grits as aggregate for applications in construction influence of granulometry and binder aggregate ratio
Construction and Building Materials, 2019Co-Authors: Manfredi Saeli, L Senff, D M Tobaldi, M P Seabra, J A LabrinchaAbstract:Abstract This work discusses the influence of the aggregate granulometry and the binder/aggregate ratio on the engineering properties of novel green geopolymeric mortars. Two wastes generated by a Portuguese Kraft Pulp Industry are employed to manufacture the material: lime slaker grits (used as aggregate) and biomass fly ash (to partially replace the metakaolin − 70 wt% substitution). The novel geopolymeric mortars could find innovative applications as sustainable construction materials. The studied mix design foresees the use of several grits granulometric ranges and ratios binder/aggregate to discuss workability, water sorptivity, and mechanical performance of the novel mortars. To date, these factors are fairly unknown in geopolymeric materials. The raw materials are also characterized. The main results demonstrate that the formulated geopolymeric mortars can be efficaciously used for masonry application in construction and predict potentialities and limits. Reuse of such wastes will increase the sustainability of the novel construction materials also granting a financial surplus for the Industry. Furthermore, manufacture and curing are conducted at ambient conditions (20 °C, 65% RH), avoiding any external source of energy, and involve a simple, reproducible, and low-cost process.
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innovative recycling of lime slaker grits from paper Pulp Industry reused as aggregate in ambient cured biomass fly ash based geopolymers for sustainable construction material
Sustainability, 2019Co-Authors: Manfredi Saeli, L Senff, D M Tobaldi, Giada La Scalia, M P Seabra, J A LabrinchaAbstract:Lime slaker grits and biomass fly ash are solid wastes produced by the Kraft paper-Pulp Industry that are commonly disposed of in landfill. However, recent studies and European regulations discourage such disposal practices. This work investigates an alternative and innovative way to recycle and reuse these wastes in the production of green geopolymeric mortars intended for application in the construction Industry. Here, biomass fly ash was used as the main source of alumino-silicate in the binder precursor (70 wt.% substitution to metakaolin), and grits (ranging from 1–12.5 mm, as provided by the Industry) were reused as aggregate. Aggregate granulometry was also completed by using a commercial natural siliceous sand (<1 mm). Mortars using sand only were prepared for comparative reasons. The implemented mix was designed to investigate the influence of the grits on the mortar’s properties such as its binder/aggregate ratio, workability, bulk density, water sorptivity, and compressive strength. At the same time, waste reuse was analysed in light of its limitations and potentialities. Moreover, in the pursuit of sustainability, the manufacturing process that was followed was highly cost-effective in ambient curing conditions (20 °C, 65% RH), which avoided the use of any external source of energy as commonly used in geopolymers processing. The achieved results proved that the combined use of these wastes, which to date has hardly been explored, along with ambient manufacturing conditions increases the material sustainability. The produced mortars are suitable for innovative applications in various fields, with a particular focus on construction and contribute to the circular economy.
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mix design and mechanical performance of geopolymeric binders and mortars using biomass fly ash and alkaline effluent from paper Pulp Industry
Journal of Cleaner Production, 2019Co-Authors: Manfredi Saeli, D M Tobaldi, M P Seabra, J A LabrinchaAbstract:Abstract This work investigates the use of biomass fly ash (BFA) and an alkaline effluent (AEF), both generated from the Kraft Pulp Industry, in the preparation of geopolymeric binders and mortars for construction applications. BFA replaced the metakaolin (MK) while the AEF substituted the distilled water used to dissolve NaOH pellets. The mix design aims to maximize the amount of both the wastes and to optimize the materials properties, such as workability and mechanical performance. At the same time, also the environmental impact decreases enhancing the materials' sustainability and facilitating the circular economy. For the previously optimized BFA/MK ratio (70/30 wt.%) several NaOH/Na2SiO3 ratios and water to AEF substitutions were tested. The best performance was achieved for the alkaline activator having one part of NaOH and three parts of Na2SiO3. According to the main results, the biologic AEF can totally replace the distilled water in the NaOH preparation. Thus will increase the sustainability of the novel materials. Subsequently, the optimized binder was used – with and without AEF - to manufacture mortars with various binder/aggregate ratios. It is concluded that the formulations with a binder/aggregate mass proportion of 1:3 showed the best mechanical performance (compressive strength surpassing 20 MPa, class M20) and the replacement of distilled water with AEF did not affect the specimens final properties, but enhance the materials sustainability. Furthermore, in the pursuit of sustainability, manufacture and curing were conducted at ambient conditions (20 °C, 65% RH), avoiding any external source of energy, involving simple, reproducible, and low-cost processes.
Maurice N Collins - One of the best experts on this subject based on the ideXlab platform.
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bio derived carbon nanofibres from lignin as high performance li ion anode materials
Chemsuschem, 2019Co-Authors: Maurice N Collins, Mario Culebras, Hugh Geaney, Anne Beaucamp, Prathviraj Upadhyaya, Eric Dalton, Kevin M RyanAbstract:Development of cost-effective and increasingly efficient sustainable materials for energy-storage devices, such Li-ion batteries, is of crucial future importance. Herein, the preparation of carbon nanofibres from biopolymer blends of lignin (byproduct from the paper and Pulp Industry) and polylactic acid (PLA) or a thermoplastic elastomeric polyurethane (TPU) is described. SEM analysis shows the evolving microstructural morphology after each processing step (electrospinning, stabilisation and carbonisation). Importantly, it is possible to tailor the nanofibre porosity by utilising miscibility/immiscibility rules between lignin and the polymer additive (PLA/TPU). PLA blends (immiscible) generate porous structures whereas miscible lignin/TPU blends are solid when carbonised. Electrodes produced from 50 % PLA blends have capacity values of 611 mAh g-1 after 500 charge/discharge cycles, the highest reported to date for sustainable electrodes for Li-ion batteries. Thus, this work will promote the development of lignocellulose waste materials as high-performance energy-storage materials.
