INTERNATIONAL JOURNAL OF DAIRY TECHNOLOGY
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2022
·Vol. 76
·期 1
·51-62
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IF 4.286
Huaxiang Li,Yanhe Zhang,Xinhai Yuan,Siqi Liu,Luyao Fan,Xiangfeng Zheng,Shuo Wang,Lei Yuan,Xinan Jiao
This study aimed to reveal microbial populations in Chinese raw milk using both 16S rRNA sequencing and high-throughput sequence (HTS) methods. Psychrotrophic isolates were clustered into 23 genera and 57 species, and the abundant genera in raw milk were Pseudomonas , Acinetobacter and Lactococcus . Genetic diversity and biofilm-forming capacity of Pseudomonas isolates were analysed using random amplified polymorphic DNA (RAPD) and crystal violet staining assay, respectively. Heterogeneous biofilm-forming ability of Pseudomonas isolates with the same RAPD patterns was observed. HTS analysis revealed a 33-fold higher diversity at the genus level, and a different bacterial population was predominated by Flavobacterium , Pseudomonas and Acinetobacter . The results provide insight into the microbial contamination of raw milk.
研究领域:
微生物学
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食品科学
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Lijuan Fu,Junsheng Yu,Jinsong Wang,Fan Xie,Shun Yao,Yongsong Zhang,Jiang Cheng,Lu Li
CuSbS 2 has been considered as a promising photovoltaic absorber material, due to its earth abundant and environmentally friendly constituents. However, the electron affinity and similar radius of cations bring heavy atomic disorders in CuSbS 2 film, limiting its photovoltaic performance. Herein, we report an efficient way to reduce disorders by introducing Ag atom into CuSbS 2 crystal structure. The crystal structure and chemical analysis confirm that Ag occupies the Cu position in the as-prepared films by the spray pyrolysis. The absorption spectra combined with photoluminescence measurement indicate that Ag-substituted CuSbS 2 films have fewer recombination centers. The density functional theory calculation result reveals that Ag-substituted CuSbS 2 has a more stable crystal structure, and the formation energy of the primary point defects obviously increases. Therefore, Ag-substituted CuSbS 2 photovoltaic device shows asignificantly improved power conversion efficiency from 0.73% to 2.48%.
研究领域:
材料科学
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光伏技术
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理论计算
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DOI
高影响因子
OPTICAL MATERIALS
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2024
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IF 3.8
Xiaoxuan Song,Jian Yang,Shuai Wang,Jia Song,Biying Bao,Hancheng Zhu,Duanting Yan,Changshan Xu,Yuxue Liu
Herein, ZMGGO:Cr 3+ nanoparticles were prepared by incorporating Mg 2+ ions into Cr 3+ -doped zinc gallogermenate nanoparticles through a hydrothermal path in combination with a vacuum heating. The average size of ZMGGO:Cr 3+ nanoparticles minishes from 59 to 12 nm with growing Mg 2+ concentration. Meanwhile their luminescence intensity at 696 nm of ZMGGO:Cr 3+ nanoparticles was only decreased by less than half of that of the undoped nanoparticles due to the decreased particle size after Mg doping. Meanwhile, the integral luminescence intensity of their entire emission band shows an increasing trend with increasing temperature due to the enhanced phonon sideband luminescence at high temperature. More important, it is found that the formation energies associated with Mg′ Ga -Ga o Zn and Zn′ Ga -Ga o Zn defects are −1.2 and 1.69 eV, respectively, suggesting the enhanced afterglow intensity of ZMGGO:Cr 3+ can be ascribed to Mg doping leading to the increased number of these anti-site traps. Finally, the dual-level time-gate optical encryption was demonstrated using phosphorescent inks containing ZMGGO:Cr 3+ nanoparticles with different afterglow intensities.
研究领域:
材料科学
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光学工程
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DOI
高影响因子
Metals
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2023
·Vol. 13
·期 4
·649
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IF 2.9
Xiaoxi Ruan,Linlin Yang,Yan Wang,Yizhe Dong,Dake Xu,Mingxing Zhang
The corrosion of carbon steel causes dramatic economic losses each year. Since conventional corrosion prevention approaches may cause pollution problems to the environment, ecofriendly and effective corrosion approaches are desired. Microbiologically influenced corrosion inhibition (MICI) has been reported as a sustainable corrosion prevention method. This work aims to evaluate the corrosion inhibition effect of two bacterial strains,Tenacibaculum mesophilumD-6 andBacillussp. Y-6 by choosing Q235 carbon steel as a model system. Scanning electron microscopy (SEM), confocal laser scanning microscopy (CLSM) and a series of electrochemical techniques were applied to study the corrosion prevention effect. The electrochemical and pitting results indicated thatT. mesophilumD-6 displayed a better corrosion protection effect.T. mesophilumD-6 formed a denser and thicker biofilm on the Q235 surface thanBacillussp. Y-6. The maximum thickness of theT. mesophilumD-6 biofilms was 11.6 ± 0.7 μm, which is about twice as thick than that ofBacillussp. Y-6. The corrosion prevention mechanism was ascribed to the formation of biofilms as a barrier to block corrosive agents such as O2. This study provides a theoretical foundation for the application of biofilms as green and effective corrosion inhibitors for carbon steel.Keywords:Q235 carbon steel;Tenacibaculum mesophilumD-6;Bacillussp. Y-6;corrosion inhibition;biofilm formation ability
研究领域:
微生物学
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材料科学
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腐蚀工程
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2020
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IF 6.155
Hao Liu,Xuan Ge,Qiaodan Hu,Fan Yang,Jianguo Li
La- and Nb-doped BaTi 2 O 5 (BT 2 ) spherical glasses were prepared by a containerless aerodynamic levitation method and their glass-forming regions were established. It is found that La-doping on the Ba-site (network-modifier) and Nb-doping on the Ti-site (network-former) show distinct difference in the glass-forming region: less than 10 % La can replace Ba whereas 40 % Nb can incorporate into BT 2 glass. The distinction in glass-forming ability induced by La- and Nb-doping is discussed mainly from the structural arrangement of the glass. Raman spectroscopy analysis shows that La-doping elongates the short Ti–O bonds in the distorted [TiO 5 ] polyhedra and thus relaxes the network. Nb-doping introduces [NbO 6 ] polyhedra into BT 2 and there exists a critical doping level (20 %), below which incorporation of Nb into BT 2 relaxes the [TiO n ] polyhedra by shortening the long Ti–O bond and above which [NbO 6 ] starts to participate in the network skeleton construction resulting in a dramatic change in the glass structure, which is supported by the dramatic change in the exothermic peak on the DTA curves. This work triggers the speculation that the network-modifiers in BT 2 glass possess a very important role in the structure of network-former skeleton than those in glasses based on traditional network-former oxides such as SiO 2 , GeO 2 and B 2 O 3 , which may provide a useful strategy for modifying the properties of these novel glasses by chemical doping.
研究领域:
材料科学
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玻璃科学
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无机化学
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DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
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2021
·Vol. 104
·期 12
·6207-6226
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IF 3.784
Xuan Ge,Jun Xu,Qiaodan Hu,Ren Qiu,Pingsheng Lai,Yanfeng Han,Fan Yang,Yongquan Zhou,Jingyu Qin,Pengfei Yu,Wenquan Lu,Jianguo Li
Although remarkable development of titanate-based glasses has been achieved, challenge remains to elucidate the correlation between structure and glass-forming properties in these systems due to their complex structure that is inconsistent with the classic Zachariasen's model. In this work, we aim to correlate the structural evolution of titanate melts to their glass-forming ability (GFA). The prototypical material barium dititanate (BaTi 2 O 5 , BT2) melts with different GFA were rendered by controlled melting atmospheres, and the corresponding structural changes were determined using in situ high-energy synchrotron X-ray diffraction combined with empirical potential structure refinement and ab initio molecular dynamics. The results show that BT2 melt in reducing atmosphere shows poor GFA but that in oxidizing atmosphere presents good GFA. Structural analysis demonstrates the mean coordination number of [TiO m ] polyhedra is analogous in the melt under two different atmospheres but an enhanced heterogeneous cations aggregation takes place in the melt under reducing atmosphere, which is closely related to oxygen-deficiencies. Furthermore, we reveal that the enhanced heterogeneous cations aggregation promotes crystallization (and therefore hinders glass formation) through disordering the distribution of [TiO m ] and [BaO n ] polyhedra, changing the connectivity between these polyhedra, creating more crystal-like Ti-Ti clusters, and decreasing topological disorder of BT2 melt. Our work provides a new viewpoint to understand the GFA of titanates melt from structural heterogeneity beyond the previous perspectives that only focus on [TiO m ] polyhedra.
研究领域:
材料科学
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无机化学
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DOI
高影响因子
Cell Reports Physical Science
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2023
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IF 8.9
Hong Meng,Renwang Yu,Zhongyu Tang,Zihao Wen,Yanhui Chu
Establishing formation ability descriptors is vital for accelerating the discovery and design of novel high-entropy carbides (HECs). However, very few studies have been reported so far. Here, we propose a combination of formation ability descriptors of HECs through high-throughput synthesis and calculation combined with the machine learning approach. Specifically, 91 HEC samples have been synthesized by the self-developed high-throughput ultrafast high-temperature synthesis apparatus, and 22 formation ability descriptors have been calculated by the high-throughput calculations simultaneously. Based on these results, eight formation ability descriptors are selected as the optimal combination to predict the phase formation of HECs through the machine learning method and the genetic algorithm. The validation accuracy of our established formation ability descriptors reaches 93.4%, at least 25.3% higher than that of previously reported ones. This study may provide theoretical guidance for discovering and designing novel HECs.
研究领域:
材料科学
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计算科学
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人工智能
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DOI
高影响因子
Laser & Photonics Reviews
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2024
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IF 9.8
Zi-Lin He,Jun-Hua Wei,Jian-Bin Luo,Zhi-Zhong Zhang,Jing-Hua Chen,Xiu-Xian Guo,Dai-Bin Kuang
The development of large-area transparent organic-inorganic hybrid metal halide (OIMH) scintillation screens is restricted by the anisotropic single-crystal growth, numerous grain boundaries in polycrystalline wafers, and inhomogeneous dispersion in perovskite-polymer composite films. The crystal-glass phase transition of OIMH materials may provide a promising solution for the above significant challenges. Herein, a new class of transparent amorphous guanidinium-based manganese bromide glasses, (DPG) 2 MnBr 4 and (DOTG) 2 MnBr 4 (DPG = 1,3-diphenylguanidinium, DOTG = 1,3-di-o-tolylguanidinium), are synthesized through a low-temperature melt-quenching process. The (DOTG) 2 MnBr 4 shows impressive glass-forming ability because of large viscosity ( η ) at the melting temperature ( T m ) ( η ( T m ) = 3426 mPa·s) and small fragility index ( m = 52.35), which can be a potential glass scintillator. The large-area (e.g., 13 cm × 13 cm) transparent amorphous (DOTG) 2 MnBr 4 glass scintillator shows high light transmittance of > 80%, a low detection limit of 237.3 nGy s −1 and high X-ray imaging spatial resolution of 12 lp mm −1 . Interestingly, the glass transition temperature of < 40 °C gives (DOTG) 2 MnBr 4 glass unique thermoplastic properties, allowing it to conform to irregularly shaped objects and reduce the distortion in X-ray imaging.
研究领域:
材料科学
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光学
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医学影像
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DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2025
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IF 13.2
Mengqi Geng,Yunbao Li,Yingnan Wang,Jialiang Li,Dan Lu,Le Jiang,Qingyong Meng,Tingting Xu
Surface passivation has emerged as an effective and feasible approach to reduce surface defects and suppress undesirable non-radiative recombination, enhancing performance and stability of perovskite solar cells (PSCs). Rational designing passivation molecules are crucial for effective and robust passivation in PSCs. With this regards, we purposely choose a series of pyridine derivatives, amino-pyridine (Py-NH 2 ), thiol-pyridine (Py-SH), 2-amino-5-(trifluoromethyl)pyridine (5-TFMAP), and 2-mercapto-5-(trifluoromethyl)pyridine (5-TFMMP) to investigate the passivation mechanism from both experimental and theoretical perspectives. The density functional theory (DFT) calculation shows that the 5-TFMMP has the highest absorption energy (E ad ) among all the passivators, thus forming the most stable bidentate coordination with the under-coordinated Pb 2+ . Meanwhile, adding −CF 3 group into the pyridine ring changes molecular electrostatic potential and increases defect formation energy of iodine vacancy (V I ) and Pb-I antisite of perovskite films. Among these four passivators, 5-TFMMP molecule combining the trifluoromethyl (−CF 3 ) group and the thiol group in the ring of pyridine ring demonstrates the best passivation effect, confirming from the highest power conversion efficiency (PCE) in carbon-based PSCs. Compared with the original PSCs, PCE of the 5-TFMMP passivated devices increased from 11.72% to 15.00%. Moreover, long-term stability of the 5-TFMMP passivated PSCs has been significantly enhanced attributing to the hydrophobic nature of the −CF 3 group at the interface of perovskite. The PCE of the 5-TFMMP-passivated PSCs has retained 88% of the initial PCE after stored at 30%–40% relative humidity for 60 days, compared with that of less than 30% for the original devices. This work provides valuable insights for proper designing effective passivators from the molecular structure point of view in PSC field.
研究领域:
材料科学
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光伏技术
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2025
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IF 9.7
Liuyang Zhao,Zian Huang,Shenao Ma,Hongfu Tang,Ruixue Tian,Hao Huang,Aimin Wu,Aikui Li,Guozhong Cao
The exceptional capacity of lithium-rich manganese-based oxides (LRMO) primarily originates from the reversible oxygen redox process. Nevertheless, long-term cycling inevitably induces lattice oxygen instability, which remains a critical challenge for the practical application of LRMO. Doping with the oxygen-affinity element silicon (Si) has been identified as a promising strategy for stabilizing lattice oxygen due to the strong Si-O covalent bonds and small ionic radii. The incorporation of robust Si-O covalent bonds and the negative charge on oxygen atoms induced reduction of transition metal slabs intralayer and expansion of transition metal slabs interlayer, thereby fixing lattice oxygen and facilitating the transport of lithium ions in the Li 1.2 Mn 0.53 Co 0.13 Ni 0.13 Si 0.01 O 2 cathode material. Theoretical calculations further demonstrate that the Si substitution strategy substantially increases the formation energy of oxygen vacancies and effectively minimizes lattice oxygen loss under high-voltage conditions (≥ 4.8 V). These findings elucidate the critical role of oxygen-affinity elements with small ionic radii in regulating intralayer/interlayer spatial variations, thereby stabilizing lattice oxygen in high-energy–density electrode materials.
研究领域:
材料科学
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电化学
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理论计算
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
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2023
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IF 10.9
Pingsheng Lai,Xuan Ge,Caijuan Shi,Jianqiang Li,Fan Yang,Wenquan Lu,Jianguo Li,Qiaodan Hu
Despite its significance in both fundamental science and industrial applications, the glass-forming transition in the Al 2 O 3 -Y 2 O 3 (AY) refractory system is not yet fully understood due to the elusive structure evolution upon cooling. Here, atomic-scale structural changes in AY-bearing melts with different compositions and temperatures are tracked by employing in situ high-energy synchrotron X-ray diffraction and empirical potential structure refinement simulation. We find that the glass-forming abilities (GFA) of AY-bearing melts are intriguingly correlated with the dependence of melt structure on temperature. In the case of the Al 2 O 3 and Y 3 Al 5 O 12 (YAG), the observed large structural changes from superheating to undercooling melt (i.e., higher temperature susceptibility) correspond to a low GFA. Conversely, the 74Al 2 O 3 –26Y 2 O 3 (AY26) melt, with the smallest temperature susceptibility, exhibits the highest GFA. Simulation models illustrate that the temperature susceptibility of melt is associated with its atomic arrangement, especially the stability of cation-cation pairs. A balanced network (in AY26 melt), where the unsteady OAl 3 tri-clusters are minimized and steady apex-to-apex connections between adjacent network units are abundant, contributes to stabilizing cationic interactions. This, in turn, fosters the formation of large-sized Al-O-Al rings, which topologically facilitates the subsequent glass-forming transition. Our findings provide new structural insight into the GFA of AY-bearing melts and may expand to other unconventional glass-forming systems to accelerate glassy materials design.
研究领域:
材料科学
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物理化学
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DOI
高影响因子
ACTA PHYSICO-CHIMICA SINICA
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2024
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IF 10.8
Wenxiu Yang,Jinfeng Zhang,Quanlong Xu,Yun Yang,Lijie Zhang
Covalent organic frameworks (COFs) represent a kind of novel crystalline porous organic substances with extended π -conjugation framework and tunable structures, which display great promise in photocatalysis. However, unadorned COFs suffer from sluggish reaction kinetics, and a cocatalyst is essentially needed to reduce the activation barrier toward specific surface reaction and accelerate reaction kinetics. In this work, bimetallic alloys serving as co-catalysts were decorated on COFs to enhance the photocatalytic hydrogen evolution performance. By precisely-tuning the ratio of AuCu alloy, the resultant Au 1 Cu 5 /COF-TpPa displays the highest photocatalytic hydrogen generation rate (8.24 mmol∙g −1 ∙h −1 ), even surpassing the Pt modified COF-TpPa (6.51 mmol∙h −1 ∙g −1 ). According to the systematic characterizations and theoretical calculation, Au 1 Cu 5 /COF-TpPa exhibits the significantly enhanced charge carrier separation efficiency and reduced H* formation energy barrier, thus possessing high photocatalytic performance. This work affords a valuable approach to advancing COF-based photocatalysts by employing bimetallic alloy cocatalysts. Download: Download high-res image (117KB) Download: Download full-size image
研究领域:
材料科学
·
光催化
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产品关联
DOI
高影响因子
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