| 1. |
- Li, Lili, et al.
(författare)
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UV-protection and fluorescence properties of the exoskeleton obtained from a living diatom modified by an Eu3+-complex
- 2021
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Ingår i: Journal of Materials Chemistry C. - : ROYAL SOC CHEMISTRY. - 2050-7526 .- 2050-7534. ; 9:31, s. 10005-10012
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Tidskriftsartikel (refereegranskat)abstract
- In this article, a natural biological porous material, from living diatoms, is used to prepare new UV-protection hybrid materials with an Eu3+-complex. By removing the organic protoplasm of living diatoms, the exoskeleton with a regular pore structure arrangement was obtained. The Eu3+-complex was chemically bonded to the exoskeleton modified by the silane coupling agent (3-aminopropyl)trimethoxy silane (APTMS). Compared with pure Eu3+-complexes, the fluorescence intensity of this hybrid material was increased by approximately 10 times. For illustrating its applications in the field of UV-protection, we mixed the USDU with polyacrylonitrile to produce flexible and transparent polymer films. The hybrid composite film (USDU@PAN) achieved partial absorption of ultraviolet light between 200 and 400 nm. At the same time, it also emits visible fluorescence and the intensity of the fluorescence is greatly increased. Therefore, the USDU@PAN film has wide application prospects in areas such as photoelectric sensors and UV-protection devices. More importantly, we transform natural organisms into materials with excellent optical properties. Therefore, it can be used in the field of UV-protection.
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| 2. |
- Yu, Xiaoshuang, et al.
(författare)
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Organic Eu3+-complex-anchored porous diatomite channels enable UV protection and down conversion in hybrid material
- 2020
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Ingår i: Science and Technology of Advanced Materials. - : TAYLOR & FRANCIS LTD. - 1468-6996 .- 1878-5514. ; 21:1, s. 726-736
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Tidskriftsartikel (refereegranskat)abstract
- The organic Eu3+-complex [Eu(TTA)(3)Phen] has been incorporated into the channels of surface-modified frustules from diatoms as a key material to absorb and convert UV-photons to visible luminescence. Systematic investigation results indicate that the organic Eu3+-complex encapsulated in the functionalized diatomite channels exhibits enhanced luminescence and longer lifetime, owning to the Eu(TTA)(3)Phen complex interacting with its surrounding silylating agents. The organic Eu3+-complex-anchored porous diatomite hybrid luminescent material was compounded with polyethylene terephthalate (PET) by using a mini-twin screw extruder to prepare a self-supporting film of the hybrid material. Besides, the UV absorption properties of the composite films were investigated. These films will potentially be related to the UV protection of photovoltaic devices.
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| 3. |
- Zhang, Xiaolin, et al.
(författare)
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Non-conjugated natural alginate as electron-transport layer for high performance polymer solar cells after modification
- 2021
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Ingår i: Journal of Power Sources. - : ELSEVIER. - 0378-7753 .- 1873-2755. ; 510
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Tidskriftsartikel (refereegranskat)abstract
- The search for the alternatives to expensive synthesized conjugated polymers as interfaces in polymer solar cells (PSCs), which could largely decrease the cost and promote the commercialization process of PSCs, is now highly relevant. To introduce natural polymer as the interface layer for the high-efficiency PSCs would be a potential choice. In this study, a purely natural polysaccharide from ocean without any conjugated structure, sodium alginate (SA), is utilized as efficient electron transport layer (ETL) to replace the conjugated star molecule, poly [(9,9-bis(3-(N,NdiMethyl)-NethylaMMoiniuM-propyl)-2,7-fluorene)-alt-2,7-(9,9-dioctylfluorene)]dibroMide (PFN-Br), and modify the aluminum (Al) electrode in conventional PSCs. The reduction of the work function of Al is successfully achieved by SA forming a dipole and keeping the ohmic contact at the interface. Meantime, the ideal charge transfer and exciton dissociation are realized, along with decreasing charge recombination, resulting in a comparable power conversion efficiency (PCE) with devices of PFN-Br as ETL. For poly([2,6-4,8-di(5-ethylhexylthienyebenzo[1,2-b; 3,3-b]dithiophene]3-fluoro-2[(2-ethylhexyl)carbonyl]thieno[3,4-b]thiophenediyl):[6,6]-phenyl-C-71-butyric acid methyl ester (PTB7-Th:PC71BM) system, PCE is increased to 9.5% and for Poly [(2,6-(4,8-bis(5-(2-ethylhexyl-3-fluoro)thiophen-2-yl)-benzo[1,2-b:4,5-b]dithio-phene))-alt-(5,5-(1,3-di-2-thienyl-5,7-bis(2-ethylhexyl)benzo[1,2-c:4,5-c]dithio-phene-4,8-dione)]:3,9-bis(2methylene-((3-(1,1-dicyanomethylene)-6,7-difluoro)-indanone))-5,5,11,11-tetrakis(4-hexylphenyl)-dithieno[2,3-d:2,3-d]-s-inda-ceno[1,2-b:5,6-b] dithiophene (PM6:IT-4F) system, PCE 13.4%, respectively, which illustrates a promising future for photovoltaic research of natural alginate non-conjugated polyelectrolyte in conventional PSCs.
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| 4. |
- Zhang, Yanying, et al.
(författare)
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Living diatoms integrate polysaccharide-Eu3+ complex for UV downconversion
- 2022
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Ingår i: Journal of Materials Research and Technology. - : Elsevier. - 2238-7854. ; 19, s. 2774-2780
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Tidskriftsartikel (refereegranskat)abstract
- In this work, living diatoms (LDT) were fed Eu3+ -complex-polysaccharide aggregates (EIPA), and the living diatoms integrated-EIPAs (LDT-E) in a completely new UV downconversion biophotonic material. The EIPAs were embedded inside siliceous cell walls of living diatoms. When dried, these diatoms (LDT-Es) are luminescent at 612 nm, due to the Eu3+ - complex. As UV-downconversion material, LDT-E absorbs UV light in the band of 250-400 nm and converts into useful visible light, thus contributing to UV-protection and potentially to photocurrent generation in photovoltaic devices. This downconversion material from living diatom retains the porous characteristics of the diatom siliceous cells, as well as the diatom organic components. Most important is the absence of a chemical process to generate this biomaterial from natural living diatoms, in order to obtain UV protection and downconversion. (C) 2022 The Author(s). Published by Elsevier B.V.
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| 5. |
- Zhou, Fanfu, et al.
(författare)
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D2 FL: Design and Implementation of Distributed Dynamic Fault Localization
- 2018
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Ingår i: IEEE Transactions on Dependable and Secure Computing. - : IEEE. - 1545-5971 .- 1941-0018. ; 15:3, s. 378-392
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Tidskriftsartikel (refereegranskat)abstract
- Compromised or misconfigured routers have been a major concern in large-scale networks. Such routers sabotage packet delivery, and thus hurt network performance. Data-plane fault localization (FL) promises to solve this problem. Regrettably, the path-based FL fails to support dynamic routing, and the neighbor-based FL requires a centralized trusted administrative controller (AC) or global clock synchronization in each router and introduces storage overhead for caching packets. To address these problems, we introduce a dynamic distributed and low-cost model, D2FL. Using random 2-hop neighborhood authentication, D2FL supports volatile path without the AC or global clock synchronization. Besides, D2FL requires only constant tens of KB for caching which is independent of the packet transmission rate. This is much less than the cache size of DynaFL or DFL which consumes several MB. The simulations show that D2FL achieves low false positive and false negative rate with no more than 3% bandwidth overhead. We also implement an open source prototype and evaluate its effect. The result shows that the performance burden in user space is less than 10% with the dynamic sampling algorithm.
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