The Experts below are selected from a list of 888117 Experts worldwide ranked by ideXlab platform
Rocio Ponce Ortiz - One of the best experts on this subject based on the ideXlab platform.
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dialkoxybithiazole a New Building block for head to head polymer semiconductors
Journal of the American Chemical Society, 2013Co-Authors: Xugang Guo, Jordan R Quinn, Zhihua Chen, Hakan Usta, Yan Zheng, Yu Xia, Jonathan W Hennek, Rocio Ponce OrtizAbstract:Polymer semiconductors have received great attention for organic electronics due to the low fabrication cost offered by solution-based printing techniques. To enable the desired solubility/processability and carrier mobility, polymers are functionalized with hydrocarbon chains by strategically manipulating the alkylation patterns. Note that head-to-head (HH) linkages have traditionally been avoided because the induced backbone torsion leads to poor π–π overlap and amorphous film microstructures, and hence to low carrier mobilities. We report here the synthesis of a New Building block for HH linkages, 4,4′-dialkoxy-5,5′-bithiazole (BTzOR), and its incorporation into polymers for high performance organic thin-film transistors. The small oxygen van der Waals radius and intramolecular S(thiazolyl)···O(alkoxy) attraction promote HH macromolecular architectures with extensive π-conjugation, low bandgaps (1.40–1.63 eV), and high crystallinity. In comparison to previously reported 3,3′-dialkoxy-2,2′-bithiophene (...
Jon Robinson - One of the best experts on this subject based on the ideXlab platform.
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environmentally sustainable development a life cycle costing approach for a commercial office Building in melbourne australia
Construction Management and Economics, 2000Co-Authors: Lu Aye, Nick Bamford, Bill Charters, Jon RobinsonAbstract:A range of property and construction options is analysed using standard life-cycle costing methodology. The options are to renovate the existing Building, buy an alternative Building and renovate, and buy a development site and construct a New Building. The do-nothing option and a hypothetical option to construct a New Building on an ideal site are analysed as benchmarks. The results show that the optimum option is to buy a suitable site and construct a New Building and that the least sustainable option, in the case study, is to stay in the existing property and renovate the Building. Although staying in the existing Building and doing nothing carries the lowest financial cost, energy consumption and greenhouse emissions are significantly worse than for the alternative options.
Xugang Guo - One of the best experts on this subject based on the ideXlab platform.
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dialkoxybithiazole a New Building block for head to head polymer semiconductors
Journal of the American Chemical Society, 2013Co-Authors: Xugang Guo, Jordan R Quinn, Zhihua Chen, Hakan Usta, Yan Zheng, Yu Xia, Jonathan W Hennek, Rocio Ponce OrtizAbstract:Polymer semiconductors have received great attention for organic electronics due to the low fabrication cost offered by solution-based printing techniques. To enable the desired solubility/processability and carrier mobility, polymers are functionalized with hydrocarbon chains by strategically manipulating the alkylation patterns. Note that head-to-head (HH) linkages have traditionally been avoided because the induced backbone torsion leads to poor π–π overlap and amorphous film microstructures, and hence to low carrier mobilities. We report here the synthesis of a New Building block for HH linkages, 4,4′-dialkoxy-5,5′-bithiazole (BTzOR), and its incorporation into polymers for high performance organic thin-film transistors. The small oxygen van der Waals radius and intramolecular S(thiazolyl)···O(alkoxy) attraction promote HH macromolecular architectures with extensive π-conjugation, low bandgaps (1.40–1.63 eV), and high crystallinity. In comparison to previously reported 3,3′-dialkoxy-2,2′-bithiophene (...
Xiao Jianzhuang - One of the best experts on this subject based on the ideXlab platform.
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Use of recycled concrete aggregates from precast block for the production of New Building blocks: an industrial scale study
2020Co-Authors: Zhao Zengfeng, Courard Luc, Groslambert Sylvie, Jehin Thomas, Léonard Angélique, Xiao JianzhuangAbstract:Large amounts of construction and demolition (C&D) waste are generated annually and will increase in the future. Until now, only a small fraction of concrete by-products is re-used as recycled concrete aggregates (RCA) for the manufacture of concrete. In this paper, the feasibility of using RCA obtained from old precast concrete block was investigated for the industrial scale production of New blocks. Concrete Building blocks with different substitution rates (0%, 30% and 100%) of natural aggregates (NA) by the same volume fraction of RCA were manufactured in a factory and the mechanical properties and durability of concrete blocks were monitored. The results show that incorporating RCA slightly decreases the compressive strength and impairs the durability of concrete blocks. However, the compressive strength of concrete blocks made with 100% RCA could reach 11.1 MPa after 28 days, which is within the requirement in Belgian codes for this type of block. The concrete blocks produced with 30% and 100% of RCA reached the strength, capillary water absorption, drying shrinkage and freeze-thaw resistance requirements for concrete blocks specified by Belgian codes. A cradle-to-gate life cycle assessment (LCA) was performed on both "classical" blocks with only NA and with substitution of NA by RCA. When considering the additional use of RCA from a nearby C&D waste recycling centre, the substitution of 30% or 100% of NA by RCA led to a reduction in the land use category, in addition to supporting the implementation of the circular economy.Peer reviewe
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Use of recycled concrete aggregates from precast block for the production of New Building blocks: an industrial scale study
'Elsevier BV', 2020Co-Authors: Zhao Zengfeng, Courard Luc, Groslambert Sylvie, Jehin Thomas, Léonard Angélique, Xiao JianzhuangAbstract:peer reviewedLarge amounts of construction and demolition (C&D) waste are generated annually and will increase in the future. Until now, only a small fraction of concrete by-products is re-used as recycled concrete aggregates (RCA) for the manufacture of concrete. In this paper, the feasibility of using RCA obtained from old precast concrete block was investigated for the industrial scale production of New blocks. Concrete Building blocks with different substitution rates (0%, 30% and 100%) of natural aggregates (NA) by the same volume fraction of RCA were manufactured in a factory and the mechanical properties and durability of concrete blocks were monitored. The results show that incorporating RCA slightly decreases the compressive strength and impairs the durability of concrete blocks. However, the compressive strength of concrete blocks made with 100% RCA could reach 11.1 MPa after 28 days, which is within the requirement in Belgian codes for this type of block. The concrete blocks produced with 30% and 100% of RCA reached the strength, capillary water absorption, drying shrinkage and freeze-thaw resistance requirements for concrete blocks specified by Belgian codes. A cradle-to-gate life cycle assessment (LCA) was performed on both "classical" blocks with only NA and with substitution of NA by RCA. When considering the additional use of RCA from a nearby C&D waste recycling centre, the substitution of 30% or 100% of NA by RCA led to a reduction in the land use category, in addition to supporting the implementation of the circular economy.Interreg project VALDE
Kenichi Ichise - One of the best experts on this subject based on the ideXlab platform.
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Application of entire concrete waste reuse model to produce recycled aggregate class H
Construction and Building Materials, 2014Co-Authors: Yasumichi Koshiro, Kenichi IchiseAbstract:Abstract An entire concrete waste reuse model for producing recycled aggregate class H concrete was established with the objective of recycling concrete waste generated during anticipated demolition of older Buildings in urban areas. In a redevelopment project of Obayashi Technical Research Institute, a 24-year old Building was demolished and concrete waste was used to produce high-quality recycled fine and coarse aggregate using a heat grinder system. Then the quality of concrete using these recycled materials was tested and applied to fair-faced concrete structures of a New Building. Fine powder, a by-product in the recycling process, was also reused as a material for clay tiles to cover the floor of the New Building. This model enabled all the concrete waste to be recycled.
