JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2025
·
IF 6.2
Fahai Dong,Nannan Zhu,Zhongya Zhang,Jiawei Jiang,Juhai Weng,Lijuan Zhang
This study successfully synthesized a novel SiCN ceramic precursor with high photosensitivity and ceramic yield through the addition reaction of Si-H and N-H groups in polysilazane (PSZ) with isocyanate groups in 2-isocyanoethyl methacrylate (IEM). The reaction mechanism between IEM and PSZ, and the curing and pyrolysis effects were investigated. The results showed that compared with 5 s exposure time, PSZ could not be cured, while the curing depth of PSZ could reach 1.51 mm after adding IEM chemical grafting modification, which significantly improved the curing printing efficiency. Increasing IEM content to 10 wt% reduced cure shrinkage from 13.85 % to 12.56 %, with a ceramic yield of 79.92 %. The bending strength of SiCN ceramic reached 30.7 MPa, and the microstructure of pyrolyzed samples was dense and free of defects. This research expands the application field of 3D-printed SiCN ceramics.
研究领域:
材料科学
·
高分子化学
·
陶瓷工程
✓ 已验证
DOI
高影响因子
CRYSTENGCOMM
·
2023
·Vol. 25
·期 40
·5722-5729
·
IF 3.1
Abraham Mensah,Wei-Min Chen,Ennin Vendish Kweku,Peng-Lai Liu,Juan-Juan Shao,Fang-Ming Wang,Li-Zhuang Chen
Five novel ‘all-in-one’ (AIO) structured cuprous iodide coordination materials 1–5 are presented. With the introduction of planar aromatic groups on the ligand, 1,4-diazabicyclo[2.2.2]octane (DABCO), targeted at eliminating stronger π–π interactions through the twisted nature of the latter species, the complexes displayed good stability, solubility, and high quantum yields of emissions ranging from 70.3–95.3%. Further systematic studies were performed on the relationship between their luminescence and modification of the ligands with halogen atoms. This work provides a reasonable idea for designing luminescent cuprous iodide materials with high quantum yields of emission for use in solid-state lighting in the future.
研究领域:
无机化学
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材料科学
·
光物理
✓ 已验证
DOI
高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Guo-Qiang Li,Zheng-Yang Huo,Qian-Yuan Wu,Zhuo Chen,Yin-Hu Wu,Yun Lu,Hong-Ying Hu
Recently, ultraviolet light-emitting diodes (UV-LEDs) and chlorine combined system has been employed as an emerging advanced oxidation process . However, UV-LEDs were commonly considered as monochromatic UV sources. In this study, the obvious quantum yields of chlorine photolysis under 265 nm and 280 nm LEDs irradiations were investigated with treating LEDs as polychromatic UV sources. Particularly, Φ obs-poly of HOCl and OCl⁻ for 265 nm LED were found to be 1.50 and 0.70 mol E −1 , respectively, whereas Φ obs-poly of HOCl and OCl⁻ for 280 nm LED were 1.28 and 0.64 mol E −1 , respectively. It was identified that Φ obs-poly were 5.66–14.63 % lower than Φ obs-mono . This suggests that obvious quantum yield using peak emission wavelength would overestimate the true quantum yield. The production of radical species in LED UV/chlorine systems were determined by the degradation of BA , and illustrated by a mathematical model. Different trends were observed for 265 nm and 280 nm LED UV/chlorine systems as pH increased from 5.0 to 10.0. As pH increased, the formation of OH continuously decreased in both 265 nm and 280 nm LED systems. The formation of Cl increased at neutral pH and more Cl and OH were formed due to the higher molar absorbance coefficient at 280 nm. The chlorine dose-dependent effects on radical productions at pH of 5.0, 7.5 and 10.0 were also assessed. At pH of 5.0, OH was the main radical product and had linear correlation with chlorine dose. At pH of 7.5, the productions of OH and Cl showed similar profiles that increased rapidly at low chlorine dosage and then slowed down.
研究领域:
环境科学
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化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
AICHE JOURNAL
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2016
·Vol. 62
·期 8
·2614-2621
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IF 2.98
Luting Ling,Wei Wang,Cai-Feng Wang,Su Chen
The intrinsic low quantum yield (QY) of type II core shell quantum dots (QDs) composes the limitation for these heterostructured nanomaterials to be used in practical application. Herein, magnetic hyperthermia method is employed to intensify reaction process and facilely synthesize CdTe/CdSe heterostructured QDs with improved optical performance for the first time. The QY of the type II QDs is increased to 49% by further growing an inert ZnO layer. The type I interface between CdSe and ZnO helps confine electrons to the inner structure of the QDs, thus improving the QY. The successful preparation and performance enhancement of the CdTe/CdSe type II QDs via magnetic hyperthermia method demonstrate the great potential of this method for the preparation of other materials. Besides, the red-emission QDs are used as conversion materials in white light emitting diodes to reveal their promising application in practical illumination. © 2016 American Institute of Chemical Engineers AIChE J , 62: 2614–2621, 2016
研究领域:
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2014
·
IF 3.552
Supeng Pei,Jing Zhang,Mengping Gao,Dongqing Wu,Yuxing Yang,Ruili Liu
A facile one-pot method to fabricate photoluminescent carbon dots (CDs) was developed by the hydrothermal treatment of amino acids at mild temperatures. Derived from three different kinds of amino acids including serine, histidine, and cystine, the resultant CDs show uniform spherical morphology with the diameters in the range of ∼2.5–4.7 nm. These amino acid derived CDs also manifest excellent photoluminescence behavior with the quantum yields (QYs) of ∼7.5% and high stability. More importantly, this method provides the opportunity to modify the sizes, structures, and photoluminescent behavior of CDs by the utilization of diversified amino acids with different structural characteristics.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED MICROBIOLOGY AND BIOTECHNOLOGY
·
2018
·Vol. 102
·期 14
·6039-6046
·
IF 3.34
Tigu Fitsum,Zhang Junli,Liu Guoxia,Cai Zhen,Li Yin
d -Pantothenic acid (vitamin B 5 ) has wide applications in the feed, food, chemical, and pharmaceutical industries. Its biological production routes which employ pantothenate synthetase (PS) as the key enzyme are attractive since they avoid the tedious and time-consuming optical resolution process. However, little data is available on the activity and kinetics of this enzyme, hampering the rational selection of an efficient enzyme for the biological production of d -pantothenic acid. In this study, six phylogenetically distant PS-encoding genes, from Escherichia coli , Corynebacterium glutamicum , Bacillus subtilis , Bacillus thuringiensis , Bacillus cereus , and Enterobacter cloacae , were expressed in E. coli . The PS from C. glutamicum exhibited a specific activity of 205.1 U/mg and a turnover number of 127.6 s -1 , which to our best knowledge are the highest values ever reported. The addition of substrates ( d -pantoic acid and β-alanine) to the E. coli strain harboring this enzyme during the early log phase of fermentation resulted in the production of 97.1 g/L of d -pantothenic acid within 32 h, corresponding to a conversion yield of 99.1% and a productivity of 3.0 g/L/h. To the best of our knowledge, this is the highest productivity reported to date.
研究领域:
生物化学
·
微生物学
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工业生物技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 47
·37697-37702
·
IF 3.84
Liuyi Yin,Yufeng Hu,Xianming Zhang,Jianguang Qi,Weiting Ma
Batch reaction experiments were performed to investigate the salt effect on the yield of trioxane in the reaction solution. The salts considered include NaHSO4, Na2SO4, NaH2PO4, Na2HPO4, KCl, NaCl, LiCl, ZnCl2, MgCl2, and FeCl3. The effects of the anionic structure and the cation charge density on the yield of trioxane in the reaction solution were elucidated and the mechanisms that govern such effects were established. It is shown that the first four salts exerted a negative effect on the yield of trioxane in the reaction solution and such an effect increased progressively from left to right. This trend is due to the formation of NaHSO4, H3PO4, or (H3PO4 and NaH2PO4), which decreased the concentration of H+ in the solution. The latter six salts showed a positive effect on the yield of trioxane in the reaction solution. The salt effect paralleled the ability of the salt to decrease the water activity of the reaction solution and followed the order KCl < NaCl < LiCl < ZnCl2 < MgCl2 < FeCl3. Continuous production experiments were performed to investigate the salt effect on the concentration of trioxane in the distillate. The salts considered were KCl, NaCl, LiCl, ZnCl2, MgCl2, and FeCl3, and the salt effect increased progressively from left to right. Such an effect was shown to be determined by the ability of the salt to increase the yield of trioxane in the reaction solution and to increase the relative volatilities of trioxane and water and of trioxane and oligomers.
研究领域:
化学工程
·
工业化学
✓ 已验证
产品关联
DOI
高影响因子
ORGANIC PROCESS RESEARCH & DEVELOPMENT
·
2021
·
IF 3.317
Fei Yu,Yafei Mao,Hongtu Zhao,Xiunan Zhang,Ting Wang,Mingpu Yuan,Suping Ding,Na Wang,Xin Huang,Hongxun Hao
Protein drugs have attracted extensive attention from the academic community. However, crystallization of proteins is difficult and the yield of current main technologies is too low, which limits their large-scale industrial production. In this work, enhancement of continuous crystallization of lysozyme under an ultrasonic field was explored. A plug-flow tubular crystallizer, which was separated into a nucleation zone and a growth zone, was applied. The effect of ultrasound on steady-state time, crystal habit, particle size, particle size distribution, and the process yield was evaluated based on univariate analysis experiments. It was found that ultrasound can shorten the time for continuous crystallization to reach a steady state, reduce the degree of aggregation, and promote nucleation. Furthermore, the separation of the growth zone from the nucleation zone in the ultrasonic-assisted continuous crystallization can further increase the size of the lysozyme crystals, which would help in increasing the yield.
研究领域:
生物化学
·
制药工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Qingyun He,Enrou Mei,Xiaojuan Liang,Weidong Xiang
Here, polyvinyl butyral (PVB) films-protected CsPbBr 3 /Cs 4 PbBr 6 halide perovskite solids (HPSs) were successfully synthesized. The optical properties and structure of HPSs@PVB were studied, finding the photoluminescence quantum yields (PLQYs) of this novel composite material is as high as 60.4%. More importantly, HPSs@PVB has excellent thermal cyclability, water and ultraviolet (UV) resistance. In addition, HPSs@PVB was further applied to light emitting diodes (LEDs) and displays. By combining green-emitting HPSs@PVB and red-emitting CsPbBrI 2 NCs@PVB with InGaN 460 nm blue chip, white light emitting diode (WLED) device can be successfully fabricated. And the device exhibits good stability and the color gamut is as wide as 126%, reaching 94% of Rec. 2020. This work proposes a simple approach to solve the challenging stability issue of perovskite nanocrystals (NCs), having a positive implication for their practical application in LEDs and display backlights.
研究领域:
材料科学
·
光学工程
·
显示技术
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2022
·
IF 8.035
Fuwei Li,Xiaofeng Wang,Hengshuo Gu,Hongbing Fu,Asad Ali,Hongfei Lin,Zhixia Li
Minimizing the catalyst cost is critical to achieving long-term economic feasibility for obtaining bio-chemicals directly from biomass. In the present study, low cost ZSM-5 was synthesized via hydrothermal crystallization of the activated aluminosilicate gel without adding any organic ammonium templates and additional seed crystals . The activation process promoted the depolymerization of the silica-alumina species and the formation of active pasty gel containing nucleation precursors, consequently accelerating the subsequent crystallization reaction. The addition of eucalyptus sawdust (ES) in the synthesis process increased the BET (Brunauer-Emmett-Teller) surface area and acidity of the resultant zeolites . The ES-mediated ZSM-5 (AGZ-10) achieved a higher benzene, toluene, ethylbenzene and xylene (BTEX) carbon yield (18.9 %) from co-cracking of ES and waste plastics (WP) (ES/WP mass ratio at 1:1) at 500 °C and exhibited better synergistic effect and anti-coking ability compared to the commercial ZSM-5. The results provide an efficient synthetic strategy to produce low-cost zeolites, and a promising technique to effectively utilize biomass and plastic wastes.
研究领域:
能源与环境科学
·
催化化学
✓ 已验证
产品关联
DOI
高影响因子
RENEWABLE ENERGY
·
2017
·
IF 4.357
Rafia Younas,Shilai Hao,Liwu Zhang,Shicheng Zhang
In this study, rice straw as an abundant agricultural waste was subjected to hydrothermal liquefaction for production of bio oil . The series of batch experiments were conducted at different temperatures (200 °C, 230 °C, 260 °C, 280 °C and 300 °C) for reaction time of 120 min with and without NiO nanocatalyst. The resulting bio-oil was categorized into light and heavy oils (LO and HO). In presence of nanocatalyst, the yields of LO and HO were maximized up to 13.2% and 17.2% at 300 °C, respectively. The carbon recovery of bio oil was significantly improved to 52.8% with 46.6% energy recovery in catalyzed reaction. Typical H/C and O/C atomic ratio of catalyzed HO are 1.2 and 0.3 respectively. The highest calorific values of LO and HO are 24.9 MJkg −1 and 31.9 MJkg −1 respectively. The tested nanocatalyst increased the yield of bio oil, but could not incite the elemental compositions and heating values of bio oil. The valuable chemical compounds in bio-oil had been analyzed by GC-MS. The LO samples mainly contained phenols, alcohols and ketones while HO consisted alkanes and organic acids. Additionally, aldehydes and other organic compounds were also found in products.
研究领域:
能源科学
·
环境科学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Kun Zheng,Xu Li,Mingjun Chen,Yi Gong,Aiwei Tang,Zhenguang Wang,Zhiren Wei,Li Guan,Feng Teng
According to mastery of solvent and reaction temperature, red, yellow, and blue emissive carbon nanodots (CNDs) with high quantum yield are successfully achieved using neutral red carbon source by solvothermal methods. The differences on the emission color of CNDs are evidently ascribed to conjugated absorption bands from n-π* transition confirmed by structural and optical characterizations. The results of quantum yield, transmission electron microscopy images, high magnification fluorescent micrographs of CNDs ethanol solution and solid-state CNDs & polyvinylpyrrolidone (CNDs&PVP) powders reveal that the obtained CNDs possess ultrahigh luminescence, favorable solubility, uniform dispersibility and well material compatibility. The bright fluorescent films were fabricated by mixing the CNDs &PVP composite powders with the epoxy. By taking advantage of these remarkable properties, the red, yellow, blue light-emitting diode was realized by combining CNDs&PVP film with a UV-LED chip. This work provides a new perspective for the explanation of the PL mechanism and the exploration of stable, high-performance, and environment-friendly multicolored CNDs-based LEDs.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）