SOLID STATE SCIENCES
·
2024
·
IF 3.4
Renzhong Xue,Xiaosong Liu,Kun Yang,Tao Li,Haiyang Dai,Jing Chen
In this study, Na 1/3 Cd 1/3 (Bi 1-x Y x ) 1/3 Cu 3 Ti 4 O 12 (NCBYCTO, x = 0−0.20) ceramics were successfully prepared via solid state method. Their microstructure along with the optical, dielectric, and non-Ohmic properties were investigated systemically. It was shown that Y 3+ doping caused the decrease in cation vacancy concentration and the increase in optical energy band. With the increase of Y 3+ content, ceramics exhibited a more stable structure, while their average grain size increased from 6.80 μm to 9.12 μm and then decreased to 2.17 μm with the dopant amount. The relative density increased from 94.7 % for the undoped specimen to 95.6 % for the specimen with x = 0.20. The giant dielectric constant (ɛ′ = 44200) at a relatively low dielectric loss (tanδ = 0.048) at 10 kHz was obtained in the specimen with x = 0.08, being more than three times that of undoped sample and demonstrating the outstanding frequency stability in the range of 40−10 6 Hz. The giant dielectric constant below 10 6 Hz originated from Maxwell–Wagner relaxation related to the insulating grain boundaries (GBs) and followed the internal barrier layer capacitor model. Besides that, Y 3+ doping improved the nonlinearity properties of NCBYCTO ceramics. The specimen with x = 0.20 had the largest nonlinearity coefficient α (∼9.60) and breakdown field strength E b (∼7.15 kV/cm). At last, the nonlinear J-E characteristics were closely related to the GB conductivity activation energy.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
POWDER TECHNOLOGY
·
2016
·
IF 2.759
Hamid Ghayour,Majid Abdellahi
Due to the wide range of applications of ceramics , interest in investigating all the parameters that influence the properties of these materials has constantly been on the increase. In the past fifty years, various studies were conducted on the effects of grain size on the properties of different ceramics. These researches provided evidence for a behavior shared by ceramics. In the present study, a brief report of the effect of grain size on the electrical properties of the BaTiO 3 -based ceramics, which are extensively used materials in electrical industries, is presented for the first time. As the range of electrical properties of this type of ceramics is quite extensive, this paper focuses on basic issues such as dielectric and piezoelectric properties alongside polarization of BT-based ceramics. The review demonstrates that despite the same behavior of these ceramics in terms of grain size alterations, there are still inevitable parameters in the course of experiments which can change this behavior.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
·
2021
·Vol. 101
·期 11
·4760-4767
·
IF 3.639
Lizhi Gao,Chenghao Zhang,Jun Chen,Chengmei Liu,Taotao Dai,Mingshun Chen,Ti Li
BACKGROUND Proanthocyanidins (PAS) were complexed with potato starch (PS) to prepare polyphenol–starch complexes. The pasting, rheological and retrogradation properties of the complexes were investigated. RESULTS The addition of PAS markedly affected the pasting, rheological and retrogradation properties of PS, especially at a concentration of 5% (w/w). Rapid viscosity analysis indicated that PAS significantly changed the viscosity, breakdown and setback value of PS. The rheological results showed that PAS decreased the flow behavior index and consistency coefficient, but increased the viscoelasticity of PS. Differential scanning calorimetry and X-ray diffraction indicated that PAS delayed the retrogradation of PS. Furthermore, scanning electron microscopy indicated that the morphologies of retrograded PS gels were greatly altered to a less compact structure with the presence of PAS. Moreover, Fourier transform infrared spectroscopy elucidated that PAS interacted with PS via a noncovalent interaction, and inhibited the retrogradation of PS. CONCLUSIONS The findings suggested that supplementing PS with PAS might be an effective and convenient method for modifying the physicochemical properties of PS. © 2021 Society of Chemical Industry
研究领域:
食品科学
·
植物化学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2024
·Vol. 108
·期 4
·e20312
·
IF 3.5
Shuangli Dong,Weichao Wang,Qinyuan Zhang
Theoretical prediction of glass compositions with certain performance requirements is a long-standing challenge in glass research. The difficulty lies in revealing the relationship of glass's composition–structure–property (C–S–P), and establishing a predictive calculation method for glass properties with high accuracy. Here we determine quantitatively the C–S–P relationships of four silicate laser glasses using nearest-neighboring congruently melting compounds (CMCs) as “component and structural motifs”. For all studied silicate systems, physical properties such as density and refractive index are predicted with an error of less than 5%. Spectroscopic properties, including Judd–Ofelt parameters, fluorescence branching ratio ( β ), effective bandwidth (Δ λ eff ), emission cross-section ( σ e ), gain bandwidth, and lifetime, are predicted with an error of less than 10%, with some properties such as β , Δλ eff , and σ e showing an error of less than 5% in specific systems. Four C–S–P databases have also been constructed, containing detailed physical and spectroscopic properties of over 1200 compositions, facilitating the optimization of glass composition. These findings highlight the significance of nearest-neighboring CMCs in understanding and developing high-performance laser glasses.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
Foods
·
2022
·Vol. 11
·期 19
·3020
·
IF 5.561
Furong Hou,Shuhui Yang,Xiaobin Ma,Zhiqing Gong,Yansheng Wang,Wenliang Wang
In this paper, emulsions stabilized byTremella fuciformispolysaccharides (TFP) were prepared and the physiochemical properties were assessed. Results showed that the TFP emulsions illustrated the highest emulsifying activity (EAI) and emulsifying stability (ESI) when the concentration of TFP and oil were 0.8% and 10% (wt%). The higher pH value was in favor of the emulsifying properties, while the addition of NaCl impaired the stability, and the greater the concentration, the lower the EAI and ESI. Besides, the emulsifying and rheological properties and stability analysis were evaluated in comparison with gum arabic, pectin, and carboxymethyl cellulose emulsions. It was discovered that TFP illustrated better storage and freeze-thaw stability, which was proved by the result of zeta-potential and particle size. The rheological measurement revealed that all the emulsions behaved as pseudoplastic fluids, while TFP displayed a higher viscosity. Meanwhile, TFP emulsions tended to form a more stable network structure according to the analysis of the parameters obtained from the Herschel–Bulkley model. FTIR spectra suggested that the O-H bond could be destructed without the formation of new covalent bonds during the emulsion preparation. Therefore, this study would be of great importance for the research of emulsions stabilized by TFP as a natural food emulsifier.Keywords:Tremella fuciformispolysaccharides;emulsifying properties;rheological properties;stability
研究领域:
食品科学
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Ming-Yuan Yan,Xiao-Yu Zhang,Li-Huai Shu,Li-Da Chen,Jian Guo,Yu Xing,Ji Zhang,Feng-Zhen Huang,Shan-Tao Zhang
Rare-earth titanate pyrochlores have attracted considerable attention for their unique magnetic frustration. Among those compounds, Yb2Ti2O7, a candidate for quantum spin ice, has been extensively studied in its magnetic ground state. However, works on its dielectric property and structure-property relationship lag far more behind. Here, by preparing and investigating nonstoichiometric Yb2–xTi2O7−δ (x = 0–0.15) ceramics, we demonstrate that the samples with x ≤ 0.05 maintain a single-pyrochlore phase, but the nonstoichiometry arouses significant structural distortion and increased oxygen vacancy. As a result, the ferromagnetism, indicated by a positive Curie-Weiss temperature, decreases almost linearly with increasing x value. Remarkably composition-dependent low-temperature dielectric relaxations have been observed. In addition, through introducing nonstoichiometry, the relaxor degree of dielectric behavior is enhanced, and the dielectric curve shows an altered shape. The origin of this dielectric relaxation is attributed to the increased structural distortion reflected by the changed bond length/angle, since there is no phase transition in 90–300 K. Our work gives a comprehensive view on the structural, magnetic, and dielectric properties of Yb2Ti2O7, which is instructive for further work on pyrochlores.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2021
·
IF 6.165
Mingcheng Li,Chunying Zhu,Taotao Fu,Youguang Ma
In this study, the densities and viscosities of the binary solutions 1-dimethylamino-2-propanol (1DMA2P) + H 2 O, benzylamine (BZA) + H 2 O, 1DMA2P + BZA and ternary solution 1DMA2P + BZA + H 2 O were measured at T = (298.15−333.15) K. Furthermore, the volumetric and the viscometric properties including the excess molar volume, partial molar volume, apparent molar volume, limiting apparent molar volume, viscosity deviation, excess Gibbs energy of activation for viscous fluid and Grunberg-Nissan interaction parameters were obtained in terms of experimental data, respectively. The excess molar volumes of binary and ternary solutions were fitted by the Redlich-Kister equation and Cibulka equation, besides, the viscosity and viscosity deviation of binary solution were correlated by using the Grunberg-Nissan equation and Redlich-Kister equation. Moreover, the intermolecular interactions were analyzed based on the volumetric and viscometric properties of solutions.
研究领域:
物理化学
·
热力学
✓ 已验证
产品关联
DOI
高影响因子
FOOD HYDROCOLLOIDS
·
2021
·
IF 9.147
Wenhao Xiao,Mingyue Shen,Yanming Ren,Huiliang Wen,Jinwang Li,Liyuan Rong,Wenmeng Liu,Jianhua Xie
This study aimed to investigate the effects of debranched waxy corn starch (DWCS) on the pasting, rheological, gelatinization, and microstructural properties of native corn starch (NCS). Pasting properties showed a linear decrease (R 2 > 0.98) in peak, trough, breakdown, setback and final viscosity after replacing NCS with DWCS. However, the stability ratio, peak time and peak temperature linearly increased. This could be explained that DWCS competed with NCS for water, thereby inhibiting NCS gelatinization process. The introduction of DWCS decreased the consistency coefficient ( K ) while increased the flow behavior index ( n ) of NCS gels. The gel hardness of NCS gels decreased linearly ( R 2 = 0.98) with increasing DWCS fraction, while the adhesiveness gradually increased. Moreover, DWCS could effectively reduce the values of short-range ordered degree and relative crystallinity. Scanning electron microscopy revealed that a more disordered structure was appeared when DWCS was added to the NCS gel. Overall, this study reveals that DWCS is an effective agent for altering and regulation the physicochemical and structural properties of NCS.
研究领域:
食品科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2024
·
IF 5.3
Bin Zhou,Xiaoqian Cao,Yujuan Rong,Can Wu,Yuying Hu,Bin Li,Bing Cui
Modifying and improving protein functionality is crucial for expanding the application of proteins in the food industry. The aim of this study was to investigate the effect of pH-shift treatments on the emulsifying and interfacial properties of glutenin (Glu). Glu was exposed to acidic (pH 1–3) and basic (pH 10–13) pH values for 4 h and subsequently neutralized for refolding. The pH-shifting treatments significantly improved Glu surface wettability with three-phase contact angle from 66.21 ± 2.31° to 91.4 ± 0.88°. The alkali shift treatment resulted in samples with larger K diff values. The treated samples also showed amplitude and frequency dependence in their E, E v , and E d values, with higher E and E d values indicating an elastic membrane at the interface. Emulsions prepared from Glu treated with alkali shift treatment exhibited smaller particle size, larger ζ-potential, and more stable storage properties. The rheological results indicated higher viscosity, thixotropy and creep of emulsions prepared from alkali shift treated Glu. In conclusion, treatment of Glu with alkali shift resulted in significant improvements in emulsifying and interfacial properties, suggesting that Glu may be a more promising ingredient for use in food.
研究领域:
食品科学
·
蛋白质化学
✓ 已验证
产品关联
DOI
高影响因子
Crystals
·
2023
·Vol. 13
·期 2
·342
·
IF 2.7
Yang Yu,Yuzhen Zhao,Yongsheng Mi,Fengmei Fang,Huimin Zhang,Zhun Guo,Yang Zhao,Dong Wang
A symmetrical pyrene derivative chemical structure was prepared by a classical synthetic method such as the Sonogashira cross-coupling reaction. The molecular structure of the product was characterised in detail by nuclear magnetic resonance (NMR), mass spectrometry (MS) and other methods. Furthermore, the optical properties of the novel products were studied by UV-vis and photoluminescence spectroscopy. The electrochemical properties of the molecules were fully characterised by comparison of electrochemical experiments and DFT simulation. Scanning electron microscope (SEM) observed that the product successfully formed a regular self-assembly structure. The product verifies the role of the molecular structure of the disc-mounted molecules on the optical and self-assembly properties, and is of reference value in the field of organic optoelectronic molecules
研究领域:
有机化学
·
材料科学
·
光电子学
✓ 已验证
DOI
高影响因子
HIGH PERFORMANCE POLYMERS
·
2018
·
IF 1.047
Jizhen Huo,Yingfeng Yu
To study the effect of charge transfer and chain stacking on the optical and thermal properties, a group of polyimides (PIs) were prepared from various diamines and dianhydrides containing sulfone, amide, and/or trifluoromethyl groups. Ultraviolet–visible spectroscopy, thermomechanical analysis, and thermogravimetric analysis were employed to study the properties of PIs. PIs containing sulfone and amide groups exhibited transmittance varying from 2.9% to 44.9% at 400 nm with good thermal stabilities of 5% weight loss in nitrogen at 455–466°C. The coefficient of thermal expansion values were 37.7–49.8 ppm/°C and glass transition temperatures were 261–299°C. The improved optical properties are owing to incorporation of amide group that decreases the electron-acceptability and sulfone group that distorts the chains, inhibiting the dense chain stacking. There is a trade-off relationship between the optical property and thermal property.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2012
·
IF 4.601
Wenlong Yin,Kai Feng,Wendong Wang,Youguo Shi,Wenyu Hao,Jiyong Yao,Yicheng Wu
The twelve quaternary rare-earth selenides Ba2MLnSe5 (M = Ga, In; Ln = Y, Nd, Sm, Gd, Dy, Er) have been synthesized for the first time. The compounds Ba2GaLnSe5 (Ln = Y, Nd, Sm, Gd, Dy, Er) are isostructural and crystallize in a new structure type in the centrosymmetric space group P1̅ of the triclinic system while the isostructural compounds Ba2InLnSe5 (Ln = Y, Nd, Sm, Gd, Dy, Er) belong to the Ba2BiInS5 structure type and crystallize in the noncentrosymmetric space group Cmc21 of the orthorhombic system. The structures contain infinite one-dimensional anionic chains 1∞[GaLnSe5]4– and 1∞[InLnSe5]4–, and both chains are built from LnSe6 octahedra and MSe4 (M = Ga, In) tetrahedra in the corresponding selenides. As deduced from the diffuse reflectance spectra, the band gaps of most Ba2MLnSe5 (M = Ga, In; Ln = Y, Nd, Sm, Gd, Dy, Er) compounds are around 2.2 eV. The magnetic susceptibility measurements on Ba2GaGdSe5 and Ba2InLnSe5 (Ln = Nd, Gd, Dy, Er) indicate that they are paramagnetic and obey the Curie–Weiss law, while the magnetic susceptibility of Ba2InSmSe5 deviates from the Curie–Weiss law as a result of the crystal field splitting. Furthermore, Ba2InYSe5 exhibits a strong second harmonic generation response close to that of AgGaSe2, when probed with the 2090 nm laser as fundamental wavelength.
研究领域:
材料科学
·
固体化学
·
物理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）