CARBOHYDRATE POLYMERS
·
2020
·
IF 7.182
Chunyan Su,Ahmed S.M. Saleh,Bo Zhang,Kun Zhao,Xiangzhen Ge,Qian Zhang,Wenhao Li
Effects of repeated annealing treatments (8 cycles, 12 h each) or continuous annealing treatments (12–96 h) at 50 °C on structural, physicochemical, and digestive properties of normal and waxy wheat starches were investigated. Wheat starches retained the original crystalline structure of A-type after annealing. Annealing treatments increased crystallinity, short chain of amylopectin, viscosity, and gelatinization temperatures of starch. However, molecular weight, long chain of amylopectin, solubility, and swelling power of starch decreased after annealing. Additionally, annealing reduced the in vitro digestibility of wheat starches. The changes in properties of starch varied depending on starch type, normal or waxy, and annealing methods, repeated or continuous. The repeated annealing was found to be more effective in modification of normal wheat starch properties. However, continuous annealing efficiently modified properties of the waxy wheat starch. The obtained results may help in choosing appropriate applications of annealed wheat starches in the food industry.
研究领域:
食品科学
·
生物化学
✓ 已验证
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Guang Yang,Hao Liang,Daiqi Zhou,Yinsheng Xu,Viktor Takats,Yaroslav Shpotyuk,Xiaoyan He,Yanfeng Gao
Effect of micro-crystallization (based on annealing time and temperature) on near-infrared (NIR)-shielding properties of Li 0.09 K 0.23 WO 3 doped glass was investigated. The tungsten bronze doped glass was prepared by a facile melt-quenching technique. Structure and optical properties of the glass and glass-ceramics were characterized by X-ray diffraction analysis (XRD), Raman, and UV–Vis–NIR spectrophotometry, respectively. Increasing the annealing temperature increases in the range from 400 °C to 500 °C, the tungsten-functional unit Li 0.09 K 0.23 WO 3 structure, which is responsible for NIR-shielding, changes the structural state from amorphous state to crystalline state gradually. Thus, the NIR-shielding properties of glass are significantly enhanced. Furthermore, annealing glass samples at 450 °C, during timeframe from 2 h to 8 h, causes crystallization and grain growth of the functional units, thus NIR-shielding property of the glasses is enhancing. It worth to be mentioned, that the increase of annealing temperature and time duration causes excessive grain growth in the glass matrix, which leads to decreasing of the optical transmittance in the visible light wavelength region. We have found, that the glass sample annealing temperature is at 450 °C with treatment time of 6 h yields the best results. In such manner the optical transmittance at λ = 1500 nm wavelength is 16.5 % and the highest transmittance of visible light wavelength region reaches 65 %. We conclude, that the NIR-shielding properties are adjustable and can be tailored by annealing temperature and time duration, which is expected to enhance the design and vary visual aspects of energy-saving windows.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF FOOD SCIENCE
·
2019
·Vol. 84
·期 8
·2050-2058
·
IF 2.081
Bo Zhang,Hao Wu,Min Gou,Meijuan Xu,Yu Liu,Luzhen Jing,Kun Zhao,Hao Jiang,Wenhao Li
In order to investigate the varied effects of repeated annealing treatment (RANN) and continuous annealing treatment (CANN) on the structural, physicochemical, and digestibility properties of the sweet potato. The 75% starch-water suspensions were prepared and incubated at 65 °C for 8 cycles and 96 hr. The results exhibited that RANN and CANN did not influence the starch granules and polarization cross obviously. The crystal type of RANN and CANN starches still maintained A-type, while the relative crystallinity increased. The solubility, swelling power, peak viscosity and breakdown of RANN and CANN starches decreased, but the gelatinization transition temperatures, trough viscosity, final viscosity, setback, and pasting temperatures of starches increased after annealing treatments. Furthermore, RANN and CANN decreased the RS and RS + SDS contents with the increase of annealing cycles and time. The RANN was more effective in modification of the crystallinity, solubility, swelling power, pasting, gelatinization transition temperatures and enthalpy, and digestibility of starch before four times compared with the CANN ones. By and large, RANN may be a potential way for modification of structural, physicochemical and digestibility properties. Practical Application The described RANN and CANN starch provide new ideas for the study of modified starch. Furthermore, this study revealed the mechanism of annealing treatment and it was concluded that the repeated annealing treatment could provide a new potential way for the modification of starch.
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
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yu Pan,Xun Liu,Meng Zhang,Qi Han,Yufei Shu,Mengxia Wang,Bei Liu,Zhongying Wang
The presence of excess fluoride ions in drinking water has raised widespread concerns, necessitating the development of effective methods for its removal. Cerium dioxide (CeO 2 ) holds promise as a selective adsorbent for fluoride ions, due to its exceptional affinity for fluoride and stability across a wide pH range. However, the impact of intrinsic properties of CeO 2 on its adsorption characteristics and mechanisms remains unclear. In this study, we prepared a range of CeO 2 materials with diverse intrinsic properties by adjusting the annealing temperature and atmosphere. Through a series of characterization techniques, we discovered a correlation between the content of oxygen vacancies, Ce(III) species, and surface hydroxyl groups (–OH), all of which decreased simultaneously with increasing air annealing temperature. With respect to the adsorption performance, the highest fluoride adsorption capacity of 111.1 mg g −1 was observed in un-CeO 2 , representing the nanomaterials with the highest oxygen vacancies. This capacity gradually decreased to 29.1 mg g −1 in 800-CeO 2 . Following fluoride adsorption, the oxygen vacancy density, Ce(III) content, and surface –OH content of all CeO 2 materials decreased. When CeO 2 materials were annealed in H 2 for 1 h, the F − adsorption density increased due to the formation of more oxygen vacancies and surface –OH. Based on our findings, we conclude that oxygen vacancies play a critical role in determining whether fluoride ions can successfully exchange with surface –OH groups and enter the crystal lattice of CeO 2 , which significantly affects the adsorption performance. The pivotal role of oxygen vacancies, as proposed in this study, provides a valuable direction for future research aimed at enhancing the fluoride adsorption performance of CeO 2 .
研究领域:
材料科学
·
环境科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 74
·70452-70459
·
IF 3.289
Makkawi Osman,Yanmin Huang,Wei Feng,Guangbo Liu,Yunfeng Qiu,PingAn Hu
Phase engineering of two-dimensional (2D) materials offers unique opportunities for acquiring novel opto-electronic properties and allows for the searching of outstanding candidates for applications in opto-electronic detectors, sensors, catalysis, or phase-change memory devices. Here, we report the phase-transformation from β-InSe to γ-In2Se3, exploiting the thermal annealing route to trigger the process starting at 200 °C that expands the family of phase-change materials. The presence of γ-In2Se3 is solidly confirmed by the characteristic peaks in X-ray diffraction (XRD) and energy dispersive X-ray (EDX), and is quite stable at ambient condition, thus facilitating substantial application in phase-change memory devices. A Raman shift in the A′1 mode from 225 cm−1 to 230 cm−1 further illustrates the phase transformation. Besides the photoluminescence (PL) peak of β-InSe, the ∼2 eV PL peak, ascribed to γ-In2Se3, is observed in the annealed nanosheet. The increased PL band gap of β-InSe as a function of annealing temperature during phase transformation was possibly affected by the suppressed interlayer coupling, as well as the planar quantum confinement of photo-excited carriers by the external surfaces of the sheets. The photodetector performance with respect to photocurrent, mobility, detectivity, responsivity, and external quantum efficiency was subsequently evaluated after thermal annealing, showing deteriorated optical performance. The present work proved that thermal annealing could induce the successful phase transformation, and adjusted the opto-electronic properties in some extent, providing useful information for processing 2D materials based nano-devices.
研究领域:
材料科学
·
光学工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2023
·Vol. 16
·期 12
·4479
·
IF 3.4
Zihan Su,Lingyu Wan,Fenglai Mo,Jiayu Li,Boxun Liu,Chuangjian Liang,Jinsong Xu,Devki N. Talwar,Hang Li,Huilu Yao
The annealing effects on Pb0.97La0.03Sc0.45Ta0.45Ti0.1O3(PLSTT) ceramics prepared by the solid-state reaction method are systemically investigated using experimental and theoretical techniques. Comprehensive studies are performed on the PLSTT samples by varying annealing time (AT) fromt(=0, 10, 20, 30, 40, 50 and 60) h. The properties involving ferroelectric polarization (FP), electrocaloric (EC) effect, energy harvesting performance (EHP) and energy storage performance (ESP) are reported, compared and contrasted. All these features are seen to gradually improve with the increase in AT, and they all reach the climaxed-shaped values and then decrease by further increasing the AT. Fort= 40 h, the maximum FP (23.2 µC/cm2) is attained at an electric field of 50 kV/cm, while the high EHP effects (0.297 J/cm3) and positive EC are achieved (for ΔT~0.92 K and ΔS~0.92 J/(K·kg)) at 45 kV/cm. The EHP value of the PLSTT ceramics increased by 21.7% while the polarization value was enhanced by 33.3%. Att= 30 h, the ceramics have attained the best ESP value of 0.468 J/cm3with an energy loss of 0.05 J/cm3. We strongly believe that the AT plays a crucial role in the optimization of different traits of the PLSTT ceramics.Keywords:ferroelectric ceramic;performance optimization;the annealing process
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
Materials
·
2018
·Vol. 11
·期 11
·2279
·
IF 2.467
Yefeng Feng,Cheng Peng,Qihuang Deng,Yandong Li,Jianbing Hu,Qin Wu
High discharged energy density and charge–discharge efficiency, in combination with high electric breakdown strength, maximum electric displacement and low residual displacement, are very difficult to simultaneously achieve in single-component polymer dielectrics. Plenty of researches have reported polymer based composite dielectrics filled with inorganic fillers, through complex surface modification of inorganic fillers to improve interface compatibility. In this work, a novel strategy of introducing environmentally-friendly biological polyester into fluoropolymer matrix has been presented to prepare all-organic polymer composites with desirable high energy storage properties by solution cast process (followed by annealing or stretching post-treatment), in order to simplify the preparation steps and lower the cost. Fluoropolymer with substantial ferroelectric domains (contributing to high dielectric response) as matrix and poly (3-hydroxybutyrate-co-3-hydroxyvalerate) with excellent linear polarization property (resulting in high breakdown strength) as filler were employed. By high-temperature annealing, the size of ferroelectric domains could be improved and interfacial air defects could be removed, leading to elevated high energy storage density and efficiency in composite. By mono-directional stretching, the ferroelectric domains and polyester could be regularly oriented along stretching direction, resulting in desired high energy storage performances as well. Besides, linear dielectric components could contribute to high efficiency from their strong rigidity restrain effect on ferroelectric component. This work might open up the way for a facile fabrication of promising all-organic composite dielectric films with high energy storage properties.Keywords:annealing;stretching;energy storage;all-organic;composite
研究领域:
材料科学
·
能源技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Materials
·
2023
·Vol. 16
·期 9
·3395
·
IF 3.4
Mingheng Mao,Shaoqiu Ke,Dingguo Tang,Xiahan Sang,Danqi He
Co magnetic films are widely used in high-frequency magnetic recording and vertical magnetic recording due to their high saturation magnetization and magnetocrystalline anisotropy. In this work, ferromagnetic Co magnetic films were prepared on copper substrate by vacuum evaporation combined with heat treatment (H2atmosphere), to investigate the impact of film thickness and annealing temperature on microstructure and magnetic properties. The results show that with the increase in annealing temperature, the Co thin film physical phase does not change significantly, the crystallinity increases, and the grain size increases, which is consistent with the results obtained from the SEM morphology map of the sample surface, leading to an increase in coercivity. By annealing experiments (atmospheric atmosphere) on Co magnetic films with and without an Al protective layer, as shown by scanning electron microscopy microscopic characterization results, it was verified that the Al layer can protect the inner Co layer from oxidation. As the film thickness increases from 10 to 300 nm, the magnetic properties of Co films change significantly. The saturation magnetization gradually increases from 0.89 to 5.21 emu/g, and the coercivity increases from 124.3 to 363.8 Oe. The remanence ratio of the 10 nm magnetic film is 0.82, which is much higher than the film remanence ratio of 0.46 at 50 nm. This is because when the thickness of the film is between 10 and 50 nm, the magnetic moments partially deviate from the in-plane direction, and the out-of-plane component reduces the film remanence ratio. This study shows that optimizing annealing temperature and film thickness can effectively control the structure and magnetic properties of Co magnetic films, which is of great significance for the development of the magnetic recording field.Keywords:magnetic films;annealing;vacuum evaporation coating;remanence ratio
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
CHEMICAL PHYSICS LETTERS
·
2023
·
IF 2.8
Yajie Wang,Xiaoyan Gan,Wei Zheng,Liling Guo,Hanxing Liu
Halide double perovskite Cs 2 AgBiBr 6 hinders its wide range of optoelectronic applications due to large band gap. This work focuses on Sb 3+ /In 3+ doping to tune the band gap of Cs 2 AgBiBr 6 thin films. The influences of annealing temperature and doping amount of Cs 2 Ag(B x Bi 1-x )Br 6 (B = Sb 3+ , In 3+ ) thin films were investigated. When annealed at the optimized temperature of 150 °C, the Cs 2 Ag(B x Bi 1-x )Br 6 (B = Sb 3+ , In 3+ ) thin films accommodate up to 100% Sb 3+ and 70% In 3+ , respectively, without showing any secondary phases. The band gap of Cs 2 Ag(B x Bi 1-x )Br 6 (B = Sb 3+ , In 3+ ) thin films decreases as the increase of Sb 3+ and increases as the increase of In 3+ amount. Therefore, the band gap regulation of 0.39 eV is realized, with the smallest value of 2.25 eV for Cs 2 AgSbBr 6 and highest value of 2.64 eV for Cs 2 Ag 0.3 In 0.7 Br 6 , respectively. Our work confirms an approach to realize band gap adjustment of Cs 2 AgBiBr 6 thin films.
研究领域:
材料科学
·
光电子学
·
半导体物理
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2018
·
IF 13.325
Li Junjun,Wu Lin,Liu Pengfei,Liu Lanjun,Zhang Bo
The effect of annealing temperature of Fe 78 Si 9 B 13 amorphous ribbons for activation of persulfate on azo dye Orange G degradation was investigated. The ribbons annealed below 623 K have very rapid degradation rate, and the degradation efficiency within 10 min was 97%. The kinetic analysis elucidated that the degradation process could be described by pseudo-first-order kinetic model. The reaction rate was not strictly decreased with the increasing annealing temperature. In particular, the ribbons with different structures by annealing at different temperatures, after the reaction, show obviously discrepant surface corrosion morphology which also plays a role in the reaction rate. Keywords Amorphous ribbon Annealing temperature Persulfate Azo dye
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
STARCH-STARKE
·
2021
·
IF 2.741
Xiaofei Shi,Yueping Ding,Jie Wan,Chengmei Liu,Sangeeta Prakash,Xue Xia
Annealing is a hydrothermal treatment that changes the structural and functional properties of starches. This study investigates and compares the effects of one-step annealing for 24 and 48 h, respectively, and two-step annealing on the structural, physicochemical, and digestive properties of Castanopsis sclerophylla starch (CaS). Annealing has no effect on CaS morphology, crystalline pattern, and short-range ordered structures. However, annealing decreases the swelling power, solubility, setback, and peak viscosity of CaS and increases its crystallinity and thermal stability. Post annealing, the rapidly digestible starch (RDS) of CaS decreases, the slowly digestible starch (SDS) increases while the resistant starch (RS) content of CaS remains unchanged. Comparing with One-step annealing for 24 h, one-step annealing for 48 h and two-step annealing does not further change the RDS and SDS content of annealed CaS.
研究领域:
食品科学
·
植物学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF FOOD ENGINEERING
·
2020
·
IF 4.499
Ying Ji
The combination of 2,2,6,6-tetramethylpiperidine-1-oxyl (TEMPO)-oxidization and annealing was applied to modify structural properties of corn starch in order to obtain starch polymer microgels. Microgels were characterized by X-ray diffraction, ATR-FTIR and thermogravimetry analysis (TGA). The effects of microgels on the uptake and release of lysozyme were also analyzed. The formation of oxidized microgels through the crosslinking between starch molecules and sodium trimetaphosphate was confirmed by X-ray diffraction. The ATR-FTIR analysis suggested that TEMPO-oxidation results in the formation of carboxyl groups. TGA data indicated that oxidized-annealed microgels had less thermal stability than oxidized microgels. Furthermore, the oxidized-annealed microgels had an improved capacity for uptake and release of lysozyme. At this stage of the exploration, microgels prepared from corn starches by annealing and oxidation is simple and efficient.
研究领域:
食品科学
·
生物化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）