AUSTRALIAN JOURNAL OF GRAPE AND WINE RESEARCH
·
2019
·Vol. 25
·期 3
·307-315
·
IF 2.343
Y. Yang,X. Wang,F. Tan,M. Fu,F. Sun
Background and Aims Burdock fructooligosaccharides (BFO) is an elicitor that induces biotic resistance and delays colour development in grapes postharvest. The mechanism of the delayed colour development requires further study. Methods and Results Colour development index; anthocyanin, tannin, flavonol, flavanol, trans -resveratrol and lignin; the trans -resveratrol, lignin and anthocyanin biosynthesis-related transcription factors; and functional gene expression were investigated. In response to BFO induction, upregulation of the v-myb avian myeloblastosis viral oncogene homologue 14 ( MYB14 )-mediated stilbene synthase ( STS ) altered the phenylpropanoid fluxes from anthocyanin to trans -resveratrol; MYBA1 and MYBA2- mediated the downregulation of dihydroflavonol 4-reductase ( DFR ), and flavonoid-3-O-glycosyltransferase ( UFGT ) limited anthocyanin biosynthesis. Downregulation of MYB4- mediated chalcone synthase ( CHS ) and upregulation of cinnamoyl CoA reductase ( CCR ) and cinnamyl alcohol dehydrogenase ( CAD ) altered the phenylpropanoid fluxes from anthocyanin to lignin. Conclusions Burdock fructooligosaccharides inhibits postharvest colour development in grapes by altering the phenylpropanoid fluxes from anthocyanin to resistance-related phenolic substances. Significance of the Study Understanding the mechanism of the effect of BFO on grape colour development may improve our understanding of colour development in grape berries.
研究领域:
植物学
·
分子生物学
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Jingxian He,Zhen Jiang,Yuan Liu,Zhenfeng Jing,Shuhui Sun,Haixia Zhang,Fengqing Zhang
This study successfully synthesized bismuth ferrite (BFO) thin films co-doped with europium (Eu) and aluminum (Al) using the sol-gel method, while comprehensively investigating their performance characteristics. By systematically adjusting the Al doping ratio in Bi 0.98 Eu 0.02 Fe1 -x Al x O 3 (with x = 0, 0.01, 0.03, 0.05, 0.07), significant changes in the material properties were observed. XRD and Raman spectroscopy validated the presence of R 3 c and Pnma phases in the synthesized BFO thin films, which demonstrated excellent crystallinity. Microstructural and compositional assessments, performed using SEM and XPS, indicated that the BEFAO5 sample possessed high crystallinity and a relatively low oxygen vacancy content. These characteristics enhanced the exceptional current-voltage (J-V) properties and ferroelectric behavior of BEFAO5. Additionally, the influence of vacancy defects on the ferroelectric efficiency and durability of BFO ferrite thin films was examined. The results indicated that the co-doping approach significantly improved the material's resistance to aging. In summary, the combined doping of Eu and Al not only substantially modified the crystalline structure and physical attributes of BFO thin films but also markedly enhanced their potential for applications in energy storage and spintronic technologies.
研究领域:
材料科学
·
物理学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Minerals Metallurgy and Materials
·
2024
·Vol. 31
·期 10
·2263-2273
·
IF 5.6
Lu Dongfei,Xi Guoqiang,Li Hangren,Tu Jie,Liu Xiuqiao,Liu Xudong,Tian Jianjun,Zhang Linxing
BiFeO 3 (BFO) has received considerable attention as a lead-free ferroelectric film due to its large theoretical remnant polarization. However, BFO suffers from a large leakage current, resulting in poor ferroelectric properties. Herein, the sol–gel method was used to deposit a series of BFO-based thin films on fluorine-doped tin oxide substrates, and the effects of the substitution of the elements Co, Cu, Mn ( B -site) and Sm, Eu, La ( A -site) on the crystal structure, ferroelectricity, and leakage current of the BFO-based thin films were investigated. Results confirmed that lattice distortion by X-ray diffraction can be attributed to the substitution of individual elements in the BFO-based films. Sm and Eu substitutions contribute to the lattice distortion in a pseudo-cubic structure, while La is biased toward pseudo-tetragonal. Piezoelectric force microscopy confirmed that reversible switching of ferroelectric domains by nearly 180° can be realized through the prepared films. The ferroelectric hysteresis loops showed that the order for the polarization contribution is as follows: Cu > Co > Mn ( B -site), Sm > La > Eu ( A -site). The current density voltage curves indicated that the order for leakage contribution is as follows: Mn < Cu < Co ( B -site), La < Eu < Sm ( A -site). Scanning electron microscopy showed that the introduction of Cu elements facilitates the formation of dense grains, and the grain size distribution statistics proved that La element promotes the reduction of grain size, leading to the increase of grain boundaries and the reduction of leakage. Finally, a Bi 0.985 Sm 0.045 La 0.03 Fe 0.96 Co 0.02 Cu 0.02 O 3 (SmLa-CoCu) thin film with a qualitative leap in the remnant polarization from 25.5 (Bi 0.985 Sm 0.075 FeO 3 ) to 98.8 µC/cm 2 (SmLa-CoCu) was prepared through the synergistic action of Sm, La, Co, and Cu elements. The leakage current is also drastically reduced from 160 to 8.4 mA/cm 2 at a field strength of 150 kV/cm. Thus, based on the increasing entropy strategy of chemical engineering, this study focuses on enhancing ferroelectricity and decreasing leakage current, providing a promising path for the advancement of ferroelectric devices.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
SOLID STATE SCIENCES
·
2023
·
IF 3.5
Zhiguo Wen,Yuke Yang
The poor comprehensive energy storage performance (energy storage density and energy storage efficiency) is a key scientific problem to be solved in the field of energy storage ceramics. In this work, (0.67- x )BiFeO 3 - x Bi 0.1 Na 0·7 NbO 3 -0.33BaTiO 3 -0.15 wt%MnCO 3 (BNBFNT- x , x = 0, 0.1, 0.2, and 0.3) ceramics were designed. The microstructure, dielectric properties , energy storage properties, and charge-discharge performances of BNBFNT- x ceramics were systematically investigated. The maximum recoverable energy density W rec of the BNBFNT-0.10 ceramic is 3.06 J/cm 3 with an efficiency of 81.4%. Apart from that, the ceramic also demonstrates excellent frequency (the variation of W rec in the frequency range of 10 Hz – 90 Hz is ± 6.4%) and thermal stability (the variation of W rec in the temperature range of 25 °C – 100 °C is ± 7.3%). Furthermore, the BNBFNT-0.10 ceramic has ultra-fast charge and discharge speeds (t 0.9 = 0.032 μs), a large power density ( P D = 22.2 MW/cm 3 ), and an extremely high current density ( C D = 355.6 A/cm 2 ).
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
MATERIALS LETTERS
·
2014
·
IF 2.269
Sujian You,Chang Liu,Huiqing Liu,Xiaolei Yu,Shasha Li,Wei Liu,Shishang Guo,Xingzhong Zhao
In this work, one-dimensional (1D) multiferroic BiFeO 3 (BFO) and poly(vinylidene fluoride-trifluoroethylene) [P(VDF-TrFE)] composite nanofibers are fabricated by using a two-step sol–gel based electrospinning method . X-ray diffraction (XRD) study reveals that crystalline phases corresponding to both BiFeO 3 and P(VDF-TrFE) are found. Microstructure measurement shows that the nanofibers are alignment and BFO nanorods are well-dispersed in the P(VDF-TrFE) fiber matrix. The coexistence of electric and magnetic hysteresis for the composite materials also has been observed successfully at room temperature. It indicates that such nanofibers would perform a wide range of potential applications in flexibility information storage, magnetic recording media , spintronics devices and sensors.
研究领域:
材料科学
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纳米技术
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多铁性材料
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聚合物复合材料
·
自旋电子学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）