The Experts below are selected from a list of 132438 Experts worldwide ranked by ideXlab platform
Adélio Mendes - One of the best experts on this subject based on the ideXlab platform.
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development of hermetic glass frit Encapsulation for perovskite solar cells
Journal of Physics D, 2019Co-Authors: Seyedali Emami, Joaquim Mendes, Rube Madureira, Daniel Hernandez, Gabriel Ernardo, Jorge Martins, Adélio MendesAbstract:A hermetic laser-assisted glass frit Encapsulation, at a process temperature of 120 °C, was developed for perovskite solar cell application. The hermeticity and long-term stability of the sealing was examined based on standard tests for photovoltaic (PV) applications. Encapsulations using fluorine doped tin oxide (FTO)-coated glass substrates displayed 8.93 × 10−8 atm cm3 s−1 air leak rate after five cycles of a humidity-freeze test according to the IEC61646 standard; a rate lower than the reject limit of the MIL-STD-883 standard test for fine leaks. Devices sealed with a TiO2 blocking layer and FTO scribing—denoted as an empty perovskite solar cell—showed that the Encapsulation is compatible with the various thermal coefficient of expansion regions of perovskite solar cells (PSCs). The applicability of the MIL-STD-883 standard was studied in detail and it was concluded that a new method is required to measure the fine helium leak rate of devices with cavity sizes larger than 5.5 × 5.5 cm2. The developed sealing process is scalable for larger devices; therefore, it guarantees a new step forward for the industrialization of PSCs.
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Development of hermetic glass frit Encapsulation for perovskite solar cells
'IOP Publishing', 2019Co-Authors: Seyedali Emami, Joaquim Mendes, Rube Madureira, Daniel Hernandez, Gabriel Ernardo, Jorge Martins, Adélio MendesAbstract:A hermetic laser-assisted glass frit Encapsulation, at a process temperature of 120 degrees C, was developed for perovskite solar cell application. The hermeticity and long-term stability of the sealing was examined based on standard tests for photovoltaic (PV) applications. Encapsulations using fluorine doped tin oxide (FTO)-coated glass substrates displayed 8.93 x 10(-8) atm center dot cm(3) center dot s(-1) air leak rate after five cycles of a humidity-freeze test according to the IEC61646 standard; a rate lower than the reject limit of the MIL-STD-883 standard test for fine leaks. Devices sealed with a TiO2 blocking layer and FTO scribing-denoted as an empty perovskite solar cell-showed that the Encapsulation is compatible with the various thermal coefficient of expansion regions of perovskite solar cells (PSCs). The applicability of the MIL-STD-883 standard was studied in detail and it was concluded that a new method is required to measure the fine helium leak rate of devices with cavity sizes larger than 5.5 x 5.5 cm(2). The developed sealing process is scalable for larger devices; therefore, it guarantees a new step forward for the industrialization of PSCs
Wei Chen - One of the best experts on this subject based on the ideXlab platform.
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silica Encapsulation of metal perovskite nanocrystals in a photoluminescence type display application
Nanotechnology, 2019Co-Authors: Wei Chen, Ming Mei, Zidong Han, Peizhao Liu, Fan Fang, Junjie Hao, Ruikun Pan, Wanqiang Cao, Kai WangAbstract:Perovskite nanocrystals (PeNCs) are attractive in high-color gamut display technology as light converters which can achieve saturated green and red lights, respectively. However, PeNCs are intrinsically fragile against ambient conditions, such as moisture and oxygen and it is hard to maintain their performance in long-term operation. In this work, a new hierarchical Encapsulation method is proposed, integrated with surface modification by halide ions protection, nano-scaled Encapsulation by in situ capping SiO2 and embedding into poly (methyl methacrylate) (PMMA) matrix composites, to achieve a stable perovskite light converting composite sheet for LED remote-type Encapsulation. The storage stability, as well as the operational stability of perovskite composites, were confirmed by the spectra evolution from encapsulated LEDs with normalized blue emission intensity. The 2D maps of spectra and aging measurement indicate that the silica Encapsulation can well protect the PeNCs in the PMMA matrix from the ambient circumstance during a long-term storage process. Additionally, the hierarchical Encapsulation for PeNCs/silica/PMMA showed better operational stability than the direct Encapsulation of PeNCs/PMMA, and the correspondent Commission Internationale de L'Eclairage color coordinates tracking also indicated more stable color properties, which demonstrates the great potential in photoluminescent display applications.
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advances in micro and nano Encapsulation of bioactive compounds using biopolymer and lipid based transporters
Trends in Food Science and Technology, 2018Co-Authors: Mohammad Rezaul Islam Shishir, Lianghua Xie, Chongde Sun, Xiaodong Zheng, Wei ChenAbstract:Abstract Background Bioactive compounds possess plenty of health benefits, but they are chemically unstable and susceptible to oxidative degradation. The application of pure bioactive compounds is also very limited in food and drug formulations due to their fast release, low solubility, and poor bioavailability. Encapsulation can preserve the bioactive compounds from environmental stresses, improve physicochemical functionalities, and enhance their health-promoting and anti-disease activities. Scope and approach Micro and nano-Encapsulation based techniques and systems have great importance in food and pharmaceutical industries. This review highlights the recent advances in micro and nano-Encapsulation of bioactive compounds. We comprehensively discussed the importance of Encapsulation, the application of biopolymer-based carrier agents and lipid-based transporters with their functionalities, suitability of Encapsulation techniques in micro and nano-Encapsulation, as well as different forms of improved and novel micro and nano-encapsulate systems. Key findings and conclusions Both micro and nano-Encapsulation have an extensive application, but nano-Encapsulation can be a promising approach for Encapsulation purposes. Maltodextrin in combination with gums or other polysaccharides or proteins can offer an advantageous formulation for the Encapsulation of bioactive compounds by using Encapsulation techniques. Electro-spinning and electro-spraying are promising technologies in micro and nano-Encapsulation, while solid lipid nanoparticles and nanostructure lipid carriers are exposing themselves as the promising and new generation of lipid nano-carriers for bioactive compounds. Moreover, phytosome, nano-hydrogel, and nano-fiber are also efficient and novel nano-vehicles for bioactive compounds. Further studies are required for the improvement of existing encapsulate systems and exploring their application in food and gastrointestinal systems for industrial application.
Barth Dominique - One of the best experts on this subject based on the ideXlab platform.
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Path computation in multi-layer multi-domain networks: A language theoretic approach
'Elsevier BV', 2015Co-Authors: Lamali, Mohamed Lamine, Pouyllau Hélia, Barth DominiqueAbstract:Multi-layer networks are networks in which several protocols may coexist at different layers. The Pseudo-Wire architecture provides Encapsulation and de-capsulation functions of protocols over Packet-Switched Networks. In a multi-domain context, computing a path to support end-to-end services requires the consideration of Encapsulation and decapsulation capabilities. It appears that graph models are not expressive enough to tackle this problem. In this paper, we propose a new model of heterogeneous networks using Automata Theory. A network is modeled as a Push-Down Automaton (PDA) which is able to capture the Encapsulation and decapsulation capabilities, the PDA stack corresponding to the stack of encapsulated protocols. We provide polynomial algorithms that compute the shortest path either in hops or in the number of Encapsulations and decapsulations along the inter-domain path, the latter reducing manual configurations and possible loops in the path.Comment: Journal on Computer Communications, 201
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Path computation in multi-layer multi-domain networks: A language theoretic approach
'Elsevier BV', 2013Co-Authors: Lamali, Mohamed Lamine, Pouyllau Hélia, Barth DominiqueAbstract:International audienceMulti-layer networks are networks in which several protocols may coexist at different layers. The Pseudo-Wire architecture provides Encapsulation and de-capsulation functions of protocols over Packet-Switched Networks. In a multi-domain context, computing a path to support end-to-end services requires the consideration of Encapsulation and decapsulation capabilities. It appears that graph models are not expressive enough to tackle this problem. In this paper, we propose a new model of heterogeneous networks using Automata Theory. A network is modeled as a Push-Down Automaton (PDA) which is able to capture the Encapsulation and decapsulation capabilities, the PDA stack corresponding to the stack of encapsulated protocols. We provide polynomial algorithms that compute the shortest path either in hops or in the number of Encapsulations and decapsulations along the inter-domain path, the latter reducing manual configurations and possible loops in the path
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Path Computation in Multi-layer Multi-domain Networks
'Springer Science and Business Media LLC', 2012Co-Authors: Lamali Mohamed, Pouyllau Hélia, Barth DominiqueAbstract:Part 8: LISP and Multi-domain RoutingInternational audienceCarrier-grade networks have often multiple layers of protocols. To tackle this heterogeneity, the Pseudo-Wire architecture provides Encapsulation and decapsulation functions of protocols over Packet-Switched Networks. At the scale of multi-domain networks, computing a path to support an end-to-end service requires various Encapsulations and decapsulations that can be nested but for which manual configurations are needed. Graph models are not expressive enough for this problem. In this paper, we propose an approach using graphs and Push-Down Automata (PDA) to capture the compatibility among Encapsulations and decapsulations along an inter-domain path. They are respectively modeled as pushes and pops on a PDA’s stacks. We provide polynomial algorithms that compute either the shortest path in hops, or in the number of Encapsulations and decapsulations to optimize interfaces’ configuration
Rafeadah Rusli - One of the best experts on this subject based on the ideXlab platform.
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Encapsulation techniques for organic phase change materials as thermal energy storage medium: A review
Solar Energy Materials and Solar Cells, 2015Co-Authors: Tumirah Khadiran, Mohd Zobir Hussein, Zulkarnain Zainal, Rafeadah RusliAbstract:Abstract Thermal energy storage based on organic phase change materials (OPCMs) has attracted much attention to various applications for their excellence properties. However, OPCMs suffers from liquid leakage problem and low thermal conductivity, which limit their application as TES material. Encapsulation of OPCMs using organic or inorganic supporting materials is an effective way to overcome the leakage problem and enhancing their thermal conductivity property. In addition, the capsules could prevent possible interaction between OPCMs with the environment. There are many technologies described the Encapsulation of OPCMs which depending on the type of supporting material and chemical properties of the OPCMs used. However, no complete overview of the techniques for Encapsulation of OPCMs is available in the open literature. In this paper, we reviewed the techniques used for Encapsulation of OPCMs and the method used to characterize the physico-chemical and thermal properties of encapsulated OPCMs. We believed that this review could provide useful information on the various Encapsulation methods of OPCMs.
Seyedali Emami - One of the best experts on this subject based on the ideXlab platform.
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development of hermetic glass frit Encapsulation for perovskite solar cells
Journal of Physics D, 2019Co-Authors: Seyedali Emami, Joaquim Mendes, Rube Madureira, Daniel Hernandez, Gabriel Ernardo, Jorge Martins, Adélio MendesAbstract:A hermetic laser-assisted glass frit Encapsulation, at a process temperature of 120 °C, was developed for perovskite solar cell application. The hermeticity and long-term stability of the sealing was examined based on standard tests for photovoltaic (PV) applications. Encapsulations using fluorine doped tin oxide (FTO)-coated glass substrates displayed 8.93 × 10−8 atm cm3 s−1 air leak rate after five cycles of a humidity-freeze test according to the IEC61646 standard; a rate lower than the reject limit of the MIL-STD-883 standard test for fine leaks. Devices sealed with a TiO2 blocking layer and FTO scribing—denoted as an empty perovskite solar cell—showed that the Encapsulation is compatible with the various thermal coefficient of expansion regions of perovskite solar cells (PSCs). The applicability of the MIL-STD-883 standard was studied in detail and it was concluded that a new method is required to measure the fine helium leak rate of devices with cavity sizes larger than 5.5 × 5.5 cm2. The developed sealing process is scalable for larger devices; therefore, it guarantees a new step forward for the industrialization of PSCs.
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Development of hermetic glass frit Encapsulation for perovskite solar cells
'IOP Publishing', 2019Co-Authors: Seyedali Emami, Joaquim Mendes, Rube Madureira, Daniel Hernandez, Gabriel Ernardo, Jorge Martins, Adélio MendesAbstract:A hermetic laser-assisted glass frit Encapsulation, at a process temperature of 120 degrees C, was developed for perovskite solar cell application. The hermeticity and long-term stability of the sealing was examined based on standard tests for photovoltaic (PV) applications. Encapsulations using fluorine doped tin oxide (FTO)-coated glass substrates displayed 8.93 x 10(-8) atm center dot cm(3) center dot s(-1) air leak rate after five cycles of a humidity-freeze test according to the IEC61646 standard; a rate lower than the reject limit of the MIL-STD-883 standard test for fine leaks. Devices sealed with a TiO2 blocking layer and FTO scribing-denoted as an empty perovskite solar cell-showed that the Encapsulation is compatible with the various thermal coefficient of expansion regions of perovskite solar cells (PSCs). The applicability of the MIL-STD-883 standard was studied in detail and it was concluded that a new method is required to measure the fine helium leak rate of devices with cavity sizes larger than 5.5 x 5.5 cm(2). The developed sealing process is scalable for larger devices; therefore, it guarantees a new step forward for the industrialization of PSCs
