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1دورية أكاديمية
المؤلفون: Rihui Yao, Dingrong Liu, Nanhong Chen, Honglong Ning, Guoping Su, Yuexin Yang, Dongxiang Luo, Xianzhe Liu, Haoyan Chen, Muyun Li, Junbiao Peng
المصدر: Nanomaterials, Vol 14, Iss 11, p 908 (2024)
مصطلحات موضوعية: laser processing, thin film transistor, terbium doping In2O3, bias light stability, Chemistry, QD1-999
الوصف: In this study, a KrF excimer laser with a high-absorption coefficient in metal oxide films and a wavelength of 248 nm was selected for the post-processing of a film and metal oxide thin film transistor (MOTFT). Due to the poor negative bias illumination stress (NBIS) stability of indium gallium zinc oxide thin film transistor (IGZO-TFT) devices, terbium-doped Tb:In2O3 material was selected as the target of this study. The XPS test revealed the presence of both Tb3+ and Tb4+ ions in the Tb:In2O3 film. It was hypothesized that the peak of the laser thermal effect was reduced and the action time was prolonged by the f-f jump of Tb3+ ions and the C-T jump of Tb4+ ions during the laser treatment. Studies related to the treatment of Tb:In2O3 films with different laser energy densities have been carried out. It is shown that as the laser energy density increases, the film density increases, the thickness decreases, the carrier concentration increases, and the optical band gap widens. Terbium has a low electronegativity (1.1 eV) and a high Tb-O dissociation energy (707 kJ/mol), which brings about a large lattice distortion. The Tb:In2O3 films did not show significant crystallization even under laser energy density treatment of up to 250 mJ/cm2. Compared with pure In2O3-TFT, the doping of Tb ions effectively reduces the off-state current (1.16 × 10−11 A vs. 1.66 × 10−12 A), improves the switching current ratio (1.63 × 106 vs. 1.34 × 107) and improves the NBIS stability (ΔVON = −10.4 V vs. 6.4 V) and positive bias illumination stress (PBIS) stability (ΔVON = 8 V vs. 1.6 V).
وصف الملف: electronic resource
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المؤلفون: Faria, Bernardo Gomes Rosa
مصطلحات موضوعية: Extraction of betacyanins, Alternative solvents, Optimization, Thermal stability, Light stability, Stabilization, Encapsulation, Double emulsion
الوصف: The biorefinery concept aims to convert biomass into biofuels and valuable by-products. This approach facilitates sustainable economic growth by enabling the development of environmentally friendly industrial production techniques. High-quality biomass is prioritized for other purposes, while low-quality biomass is used for energy generation. This cascade approach reduces waste streams and enhances resource efficiency, aligning it with the principles of a circular economy. In this work, a process of extraction of betalains from red beetroot waste was developed using a eutectic solvent (DES). To optimize this process, the key factors were the DES molar ratio, the solid-liquid ration (SLR), water content, pH and time of extraction. After the selection of the best solvent and process conditions, the stability of the pigment was studied through its degradation kinetics at different conditions of temperature and light exposure. After studying the pigment’ stability, two different methodologies of stabilization were tested, namely its encapsulation in silicon dioxide and in a double emulsion. In the case of encapsulation in SiO₂, the pigment failed to be stabilized and decreased its half-life time. In the encapsulation in the double emulsion, even though the emulsion was stable for a long time, the pigment still degraded quickly. It’s worth noting that the DES composed of Betaine:Glycerol exhibited a positive effect in improving the stability of the pigment.
الوصف (مترجم): O conceito de biorefinaria visa converter biomassa em biocombustíveis e subprodutos valiosos. Esta abordagem facilita o crescimento económico sustentável, permitindo o desenvolvimento de técnicas de produção industrial ecologicamente corretas. A biomassa de alta qualidade é priorizada para outros fins, enquanto a biomassa de baixa qualidade é usada na geração de energia. A abordagem processual em cascata reduz os fluxos de resíduos e aumenta a eficiência dos recursos, alinhando-se aos princípios de uma economia circular. Neste trabalho, um processo de extração de betacianinas de resíduos de beterraba vermelha foi desenvolvido usando um solvente eutéctico (DES). Para otimizar esse processo, os principais fatores foram a razão molar do DES, a razão sólido-líquido (RSL), o teor de água do solvente, pH e tempo de extração. Em seguida, a estabilidade do pigmento foi estudada recorrendo à cinética de degradação do pigmento em diferentes condições de temperatura e por exposição à luz. Identificada a baixa estabilidade do pigmento, foram estudadas duas metodologias para a sua estabilização, o encapsulamento do pigmento em SiO₂ e numa dupla emulsão. No caso do encapsulamento em SiO₂, o pigmento não foi estabilizado e diminuiu bastante o tempo de meia-vida. No encapsulamento na dupla emulsão, embora a emulsão tenha sido estável por um longo período, o pigmento não foi protegido da perda de estabilidade. No entanto, é de notar que o DES Betaína:Glicerol exibiu um efeito positivo na estabilidade do pigmento.
وصف الملف: application/pdf
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3دورية أكاديمية
المؤلفون: Manfred Hofmann, Rita Hofmann-Sievert
المصدر: Heritage, Vol 5, Iss 4, Pp 4061-4073 (2022)
مصطلحات موضوعية: light stability of photographic prints, wavelength dependent light fading, action spectrum of inkjet prints, Archaeology, CC1-960
الوصف: (1) Background: The use of light-emitting diode (LED) lighting is increasingly replacing traditional light sources in museums. There is a need to anticipate the damage caused by LED lighting to photographic prints. The aim of this study is to quantitatively predict fading on three inkjet color patches exposed to different white light LED; (2) Method: The novel approach of this work is to measure the wavelength-dependent photochemical efficiency on color patches using a narrow band LED. First, the color patches are exposed to narrow band LED lamps in a proprietary light chamber. Sensitivity curves are obtained by plotting the density changes caused by narrow band exposure as a function of the exposure. In the second step, action spectra are derived from the slopes of the sensitivity curves. The action spectra correspond to the rates of change of a color patch to exposure with different wavelengths of light. In the third step, the narrow band light emissions are fitted to the emission spectra of the white LED of interest. The fitting factors are used to calculate the weighted sum of the density changes; (3) The method predicts the absolute density change of color patches for several white light LED exposures.
وصف الملف: electronic resource
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4دورية أكاديمية
المؤلفون: Koromo Shirota, Masataka YASHIMA, Taichi SHINTOU, Tomoyuki NODA, Tsuyoshi SANTO, 三東 剛, 八島 正孝, 城田 衣, 新藤 太一, 野田 智之
المصدر: 色材協会誌 / Journal of the Japan Society of Colour Material. 2023, 96(6):212
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5دورية أكاديمية
المؤلفون: Bumjin Gil, Alan Jiwan Yun, Jiheon Lim, Jaemin Cho, Beomsoo Kim, Seokjoo Ryu, Jinhyun Kim, Byungwoo Park
المصدر: Advanced Materials Interfaces, Vol 10, Iss 11, Pp n/a-n/a (2023)
مصطلحات موضوعية: electron transport layers, heat stability, light stability, perovskite solar cells, SnO 2, Physics, QC1-999, Technology
الوصف: Abstract In order to realize both efficient and stable perovskite solar cells, designing electron transport layer (ETL) is of crucial importance to withstand constant light illumination and thermal stress while maintaining high charge extractability. Herein, commonly used SnO2 nanoparticle‐based ETL for perovskite solar cells is modified by ionic‐salt ammonium chloride (NH4Cl) and tin chloride dihydrate (SnCl2∙2H2O) as additives, which is easily fabricated by simple one‐step spin coating of single precursor solution. With the presence of these dual additives at the ETL, the crystallinity of the upper perovskite layer is clearly enhanced. Defect analyses on the devices suggest that these modifications can effectively passivate trap sites that reside within the ETL and at the perovskite interfaces with the carrier‐transport layers. As a result, the modified SnO2 ETL results in an improvement of device stability under thermal or light stress condition, maintaining over 80% of its initial efficiency after ≈2000 h storage under elevated temperature (85 °C) and after ≈2400 h of operation under 1 sun illumination.
وصف الملف: electronic resource
العلاقة: https://doaj.org/toc/2196-7350Test
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6دورية أكاديمية
المؤلفون: Lochhead, Kate
المصدر: Electronic Thesis and Dissertation Repository
مصطلحات موضوعية: Perovskite solar cells, Degradation, UV light stability, Thin film encapsulation, Pulsed laser deposition, Oxygen vacancies, Semiconductor and Optical Materials
الوصف: Perovskite solar cells are an emerging sustainable energy conversion technology with the potential to provide relief from the global energy crisis. However, the UV-induced degradation of perovskites has been a barrier to commercialization. Thin film encapsulation represents a promising solution for extending device lifetimes. Three materials with suitable bandgaps for blocking UV light are identified: TiO2, ZnO and AZO. Herein, the optical properties of TiO2, ZnO and AZO thin films grown by room-temperature pulsed laser deposition are optimized by varying the oxygen partial pressure during deposition. UV-Vis spectroscopy reveals facile bandgap tuning via the concentration of O2 vacancies. Accelerated UV-aging experiments find that the films which screen the most UV light are also most effective in delaying perovskite degradation. A comparison of TiO2, ZnO and AZO photoprotective coatings concludes that ZnO is most suitable for perovskite solar cell encapsulation since it provides a ∼50% reduction in UV-degradation without significantly compromising visible light transmittance.
وصف الملف: application/pdf
العلاقة: https://ir.lib.uwo.ca/etd/9150Test; https://ir.lib.uwo.ca/context/etd/article/11954/viewcontent/Kate_thesis_final_revised.pdfTest
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7دورية أكاديمية
المؤلفون: Qing Li (84975), Yujuan Guo (3116907), Shunmin Yi (14350896), Zushun Xu (1485742), Wengui Duan (6547223), Sheng Liu (279488)
مصطلحات موضوعية: Biophysics, Space Science, Biological Sciences not elsewhere classified, Chemical Sciences not elsewhere classified, Physical Sciences not elsewhere classified, sepia eumelanin nanocomposites, pore structure construction, optimal tensile strength, much less variation, enhanced comprehensive performance, covalent network structure, thermal analysis showed, synergistic uv absorption, fpi ), acquiring, ase ), respectively, g , thermal properties, >< sub, uv exposure, remarkable uv, exceptional uv, surface roughness, superior photostability, pure fpi, pristine fpi, photothermal conversion, light stability, fracture elongation
الوصف: Natural marine sepia eumelanin-derived additives (ASE) were used as a filler to modify highly fluorinated polyimide (FPI), acquiring the enhanced comprehensive performance by chemical bonding and pore structure construction. Stress–strain curves indicated an optimal tensile strength of 108.25 MPa and a fracture elongation of 4.83% (1 wt % ASE), respectively, 1.30 and 1.34× that of pure FPI. Thermal analysis showed that T g was as high as 360.1, 14.4 °C higher than that of pristine FPI. The exceptional UV-shielding capabilities of the FPI/ASE films were confirmed by measurements of curcumin photodegradation, durability, and so on. FTIR and AFM manifested their superior photostability with basically unchanged carbonyl absorption peaks and much less variation in surface roughness after UV exposure for 720 h. To sum up, the covalent network structure between FPI and ASE contributed to the improvement of mechanical and thermal properties. The mechanisms, such as synergistic UV absorption of FPI and ASE, photothermal conversion, and ASE’s free radical trapping ability, were responsible for the remarkable UV-shielding and light stability. The above remarkable comprehensive performance makes the FPI/ASE film a candidate for UV shielding in aerospace applications.
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8دورية أكاديمية
المؤلفون: Elivaldo Nunes Modesto Junior, Mayara Galvão Martins, Gustavo Araujo Pereira, Renan Campos Chisté, Rosinelson da Silva Pena
المصدر: Foods; Volume 12; Issue 3; Pages: 565
مصطلحات موضوعية: Amazonian fruits, bioactive compounds, light stability, food processing
جغرافية الموضوع: agris
الوصف: Grumixama (Eugenia brasiliensis Lam.) are red-colored fruits due to the presence of anthocyanins. In this paper, anthocyanin-rich extracts from grumixama were submitted to different temperatures and light irradiations, with the aim of investigating their stabilities. The thermal stability data indicated that a temperature range from 60 to 80 °C was critical to the stability of the anthocyanins of the grumixama extracts, with a temperature quotient value (Q10) of 2.8 and activation energy (Ea) of 52.7 kJ/mol. The anthocyanin-rich extracts of grumixama fruits showed the highest stability during exposure to incandescent irradiation (50 W), followed by fluorescent radiation (10 W). The t1/2 and k were 59.6 h and 0.012 h−1 for incandescent light, and 45.6 h and 0.015 h−1 for fluorescent light. In turn, UV irradiation (25 W) quickly degraded the anthocyanins (t1/2 = 0.18 h and k = 3.74 h−1). Therefore, grumixama fruits, and their derived products, should be handled carefully to avoid high temperature (>50 °C) and UV light exposure in order to protect the anthocyanins from degradation. Furthermore, grumixama fruits showed high contents of anthocyanins that can be explored as natural dyes; for example, by food, pharmaceutical and cosmetic industries. In addition, the results of this study may contribute to the setting of processing conditions and storage conditions for grumixama-derived fruit products.
وصف الملف: application/pdf
العلاقة: Plant Foods; https://dx.doi.org/10.3390/foods12030565Test
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9دورية أكاديمية
المؤلفون: Bingcheng Yu, Shan Tan, Dongmei Li, Qingbo Meng
المصدر: Materials Futures, Vol 2, Iss 3, p 032101 (2023)
مصطلحات موضوعية: inorganic halide perovskites, inorganic halide perovskite solar cells, light stability, thermal stability, phase instability, Materials of engineering and construction. Mechanics of materials, TA401-492
الوصف: Inorganic halide perovskite solar cells (IHPSCs) have become one of the most promising research hotspots due to to the excellent light and thermal stabilities of inorganic halide perovskites (IHPs). Despite rapid progress in cell performance in very recent years, the phase instability of IHPs easily occurs, which will remarkably influence the cell efficiency and stability. Much effort has been devoted to solving this issue. In this review, we focus on representative progress in the stability from IHPs to IHPSCs, including (i) a brief introduction of inorganic perovskite materials and devices, (ii) some new additives and fabrication methods, (iii) thermal and light stabilities, (iv) tailoring phase stability, (v) optimization of the stability of inorganic perovskite solar cells and (vi) interfacial engineering for stability enhancement. Finally, perspectives will be given regarding future work on highly efficient and stable IHPSCs. This review aims to provide a thorough understanding of the key influential factors on the stability of materials to highly efficient and stable IHPSCs.
العلاقة: https://doi.org/10.1088/2752-5724/acd56cTest; https://doaj.org/toc/2752-5724Test; https://doaj.org/article/2ba774f060da4fc5a4a220baa031db4dTest
الإتاحة: https://doi.org/10.1088/2752-5724/acd56cTest
https://doaj.org/article/2ba774f060da4fc5a4a220baa031db4dTest -
10مؤتمر
المؤلفون: Wei Zhang
مصطلحات موضوعية: F120 - Inorganic chemistry, F200 - Materials science, J910 - Energy technologies, interface modification, Metal Halide, Planar Heterojunction Perovskite Solar Cells, UV-light Stability
الوصف: Legacy description not available
النص الكامل