CERAMICS INTERNATIONAL
·
2016
·
IF 2.758
Yining Ma,Huaijuan Zhou,Jingting Zhu,Shidong Ji,Shanhu Bao,Rong Li,Ping Jin
Flake-like VO 2 (M) has been successfully synthesized by annealing plate-like (NH 4 ) 0.6 V 2 O 5 in vacuum and its thermochromicity was investigated. Preparation conditions such as temperature and vacuum degree have been varied to obtain the pure phase. The formation mechanism from ammonium vanadium bronze to VO 2 (M) has been explored. The flake-like VO 2 (M) shows an excellent thermochromicity; the infrared modulation at 2500 nm was up to 56.6% with a 30% visible transmittance which will be beneficial for smart windows, smart curtains or other applications.
研究领域:
材料科学
·
热致变色材料
·
纳米材料
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2018
·
IF 3.927
Chunli Liu,Yuxuan Sun,Zhenbin Chen,Suobo Zhang
An integrally skinned dense ultrafiltration (UF) membrane was prepared using partially di-quaternized poly(sulfone- co -ethernitrile) random copolymer (PSF- co -DQAPEN) via classical nonsolvent induced phase inversion process (NIPS). Then the original UF membrane was molecularly restructured through a combined process of chemical quaternization-crosslinking reaction and thermal annealing for the preparation of a crosslinked nanofiltration (NF) membrane, in which p -xylylene dichloride (PXDC) and isopropanol were employed as crosslinking agent and nonsolvent treating medium, respectively. The influence of reaction time and crosslinker concentration on membrane performance were investigated. X-ray photoelectron spectroscopy (XPS) of membrane surface and solubility test of membrane were employed to study the chemical composition and crosslinking properties of membranes, and those results revealed that the original membrane had been successfully crosslinked after this post treatment process. The separation performance of membrane was ultimately changed from UF-level to NF-level after the quaternization-crosslinking reaction and thermal annealing treatment process. The optimum crosslinked NF membrane possessed MgCl 2 rejection of 98.2% and water permeate flux of 4.12 L m −2 h −1 bar −1 . Moreover, owning to the excellent chemical stability of membrane material, the crosslinked membrane had outstanding resistance to chlorine, acid and base, thus it can be used for water softening and removing of positive dyes. Given the convenience and feasibility of this modification method, integrally skinned NF membrane could be easily fabricated via the post chemical crosslinking and thermal annealing process of UF membrane using proper treating approaches.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2022
·Vol. 106
·期 1
·285-292
·
IF 4.186
Mengjiao Chi,Yahan Liu,Jianwei Zhao,Chao Dong,Xinjiang Luo,Dawei Wang,Bing Liu,Minmin Mao,Feng Shi,Kaixin Song
It is difficult to get pure-phase Mg 3 B 2 O 6 (abbreviated as MBO) ceramics by the traditional high-temperature solid-state reaction method. In this paper, pure-phase MBO ceramics were successfully densified and obtained by combining the cold sintering and post-annealing process. The relative density of MBO ceramics was ∼80% cold sintered at 150°C/90 min/800 MPa, which was further improved to ∼91% by post-annealing at 900°C, 400°C lower than that of the traditional high-temperature sintering process (∼1300°C). X-ray powder diffraction (XRD), scanning electron microscopy (SEM), and Raman results demonstrated that the secondary phase of MgO was effectively eliminated, and dense microstructure was observed by the cold-sintering process plus post-annealing treatment. Finally, the microwave dielectric properties of MBO were evaluated with ε r : 5.15–6.37, Q×f : 5942–16 686 GHz, τ f : −48.45–69.72 ppm/°C.
研究领域:
材料科学
·
陶瓷工程
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2022
·
IF 9.231
Yuxue Zheng,Ziqi Chai,Xiangli Kong,Shiguo Chen,Xingqian Ye,Jinhu Tian
Annealing treatment on the physicochemical properties and hydrolysis of maize, potato and pea starch were investigated in present study. Results indicated that annealing treatment did not change the morphology of the starch. However, the relative crystallinity of maize and potato starch showed a peak trend as the annealing time extended, while pea starch showed a lower relative crystallinity. Besides, all the annealed starch showed a decrease in peak viscosity and an increase in pasting time. Little difference in the rapidly digestive starch (RDS) and resistant starch (RS) contents of annealed maize starch and pea starch were observed after annealing, while annealed potato starch (72 h) showed an increased RS content (23.37 ± 5.36 %) and a decreased RDS content (52.60 ± 6.14 %), respectively. The obtained results may provide a better understanding of the physicochemical properties and enzymatic hydrolysis of annealed starch with different semi crystalline type.
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
Journal of Energy Storage
·
2022
·
IF 8.907
Huan Liu,Ziyue Wang,Jiyang Xie,Changjin Guo,Wanbiao Hu
Poly(vinylidene fluoride) (PVDF) is a basic polymer that has been extensively used in flexible electronics, with the properties differing in terms of multiple phases, e.g. α , β , and γ . As generally involved, processing induced phase variations have not yet been identified clearly, which furthermore often embarrasses the attributions and contributions in the properties and mechanisms. To this end, the phase compositions and evolutions in pure PVDF films are systematically tuned and explored by annealing and quenching processing. The annealed PVDF exhibits a predominant γ -phase, while α -phase is dominated in quenched PVDF. Upon the induced different phase compositions, the optimally processed PVDF films similarly exhibit an ultrahigh dielectric energy storage density e.g. 19.66 J cm −3 for annealed and 21.73 J cm −3 for quenched PVDF film, respectively, but only the former maintains a simultaneously high discharge efficiency of 65 %. With showing excellent energy storage performance, the processed especially the annealed PVDF film could compare to many existing high-performance dielectric energy storage systems . This work thus not only uncovers the phase evolutions as well as their impacts on the properties in PVDF system, but also demonstrates firstly a high energy storage performance in pure PVDF.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
Advanced Energy and Sustainability Research
·
2021
·Vol. 3
·期 1
·2100146
·
IF 0
Deyu Liu,Xiuyu Chen,Yuepeng Qiao,Yang Zhou,Yongbo Kuang
Oxide-based photoelectrodes for solar water splitting have gained growing attention because of their decent stability and cost-effectiveness. Particularly, α-SnWO 4 has been regarded as a potential next-generation light absorbing material due to the predicted favorable bandgap of 1.9 eV. Herein, the investigation and amelioration of the crystallinity as a performance dominating factor to the α-SnWO 4 -based photoanode are demonstrated. The improvement is attributed to a unique crystallization process induced by the formation of oxygen vacancies in the reductive atmosphere at 500 °C. The sample exhibits notably enhanced visible-light absorption and an improved charge transport property. Electrochemical measurements reveal a cathodic shift of the flat-band potential, corresponding to the impacted band position. The photocurrent is enhanced from 0.03 to 0.42 mA cm −2 (AM1.5, 1.23 V RHE ). Such a new treatment can be used as an effective tool for developing α-SnWO 4 into efficient photoelectrocatalytic (PEC) materials.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
Coatings
·
2023
·Vol. 13
·期 5
·866
·
IF 3.4
Zhen He,Chen Yu,Jiaming Liu,Zengcheng Miao,Yuxin Wang
Sb-doped SnO2(SnO2-Sb) coatings show superiority in degrading toxic and refractory organic pollutants. SnO2-Sb coatings can be prepared by oxidizing electrodeposited Sn-Sb coatings through an annealing process. The properties and structure of SnO2-Sb coatings can be tailored by adjusting the preparation parameters. This study examines the effects of crucial preparation parameters on the performance of SnO2-Sb coatings, with the aim of enhancing their properties.Determining the coatings’ cross-sectional and surface characteristics was accomplished using various characterization techniques. A thorough investigation of the prepared samples’ phase and element components was also carried out. Based on the findings, the surface roughness of the prepared Sn-Sb precoating changed with increasing current density, yet the primary surface features of the SnO2-Sb coatings were hardly altered by the annealing process. Without lowering the coating thickness, the appropriate current density of 30 mA/cm2produced a rough and active coating surface. Our study’s proper annealing temperature of 600 °C transformed Sn-Sb precoating into SnO2-Sb coating and achieved excellent coating quality.While changes in the Sb content affected the morphology of the prepared SnO2-Sb coatings, the mixed oxide coatings’ cassiterite SnO2phase was unaffected. These results may provide insights into the optimized use of SnO2-Sb coatings in various applications.Keywords:SnO2-Sb;electrodeposition;structures
研究领域:
材料科学
·
环境工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2022
·Vol. 33
·期 31
·24038-24047
·
IF 2.779
Yu Tengfei,Jiang Subin,Qiao Yi,Liu Feng,Yang Baojuan,Gao Meizhen
High-performance 0.7Bi 1.02 FeO 3 –0.3BaTiO 3 ceramics are prepared by traditional solid-state method with annealing. The effect of annealing temperature ( T A ) on the piezoelectric properties of ceramics are revealed by studying the crystal structures, ferroelectric properties, and electrical properties of the as-sintered ceramic and ceramics annealed at 600, 700, 800, and 900 °C. Through the analysis, we found that T A has little influence on the morphology and crystal structure of ceramics, all ceramics are two-phase ( R-PC ) coexistence structures. But T A relates to the concentration of charge defects. When annealing at 800 °C, the charge defects in the ceramic are the least. Therefore the best performance ( d 33 = 202 \(\pm\) 3 pC/N, T C = 496 °C) ceramic is obtained. Our experiments demonstrate that the charge defects induced by annealing temperature are very important to the piezoelectricity of BFO–BTO ceramics.
研究领域:
材料科学
·
电陶瓷
·
固体物理
✓ 已验证
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Qi You,Jun Zhu,Luomeng Chao,Hai Zhang,Sihua Ha
Controlling the crystallization of gallium oxide (Ga 2 O 3 ) crystal as well as intrinsic defects (oxygen vacancies) are crucial steps in obtaining high-quality material and elucidating how defects affect semiconductor properties . Gallium oxide hydroxide (GaOOH) was firstly synthesized via the reaction of gallium nitrate (Ga(NO 3 ) 3 ) with different alkalis (Urea, NH 3 ·H 2 O, Na 2 CO 3 and NaOH) using the precipitation technique. Then, Ga 2 O 3 powder was obtained by adding carbon powder as reducing agent at the calcination stage. The β-Ga 2 O 3 powder prepared by NH 3 ·H 2 O were found to have the best crystallization as analyzed by X-ray diffractometer (XRD) and scanning electron microscopy (SEM). Meanwhile, the photoluminescence (PL) and X-ray photoelectron spectroscopy (XPS) results combined with the first-principles calculation indicate that the Ga 2 O 3 powder made by NH 3 ·H 2 O also has the least intrinsic oxygen vacancies .
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2019
·
IF 4.175
Shanshan Pan,Hui Liu,Zhili Li,Li You,Shengnan Dai,Jiong Yang,Kai Guo,Jun Luo
Due to the lone-pair-induced anharmonic rattling, InTe exhibits intrinsically ultralow thermal conductivity , which was considered as a candidate for thermoelectric application. However, the poor electrical transport properties result in low thermoelectric conversion efficiency. In this work, Cd doping in InTe have been performed with the aim to optimize the carrier concentration and increase the power factor. Furthermore, an essential enhancement of carrier mobility can be realized via prolonging the annealing time, leading to improved thermoelectric performance. As a result, the maximum thermoelectric figure of merit zT of 0.87 at 773 K has been achieved for In 0.98 Cd 0.02 Te undergoing 7 days annealing treatment (In 0.98 Cd 0.02 Te-7days), which is 67% higher than the value of InTe after 2 days annealing (InTe-2days, zT = 0.52@773 K). The average zT increases significantly from 0.26 for InTe-2days to 0.53 for In 0.98 Cd 0.02 Te-7days in the temperature range of 323–823 K. Thus, both introducing Cd dopant and regulating the annealing time have obvious effects on improving the thermoelectric performance of InTe.
研究领域:
材料科学
·
热电学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF REFRACTORY METALS & HARD MATERIALS
·
2020
·
IF 3.407
Longqing Chen,Wenbin Qiu,Hao Deng,Xiaoliang Yang,Yangyipeng Song,Jun Zhu,Jun Tang
The shrinkages presented in sintering process of tungsten alloys are extremely detrimental to their practical applications in fusion reactors. Positively in this work, we effectively reduced the shrinkages via synergistically applying Ti-doping and annealing process on tungsten‑potassium (WK) alloys. This shrinkage-fill effect only works in the one with trace amount of titanium doping, such as 0.05 wt%Ti or 0.5 wt%Ti. Due to such effect, the compressive strength was improved by ~18%. Based on morphological and elementary analyses, we speculated that the Ti-rich particles along the grain boundaries of WK alloys were activated and migrated into shrinkages during annealing. Further Ti doping (e.g. 1wt.%Ti) led to nanoscale grain refinement in WK alloys, which almost doubled the compressive strength. In this case, an unconventional grain-refinement model was proposed. Furthermore, anomalous grain growth was observed in WK-3wt.%Ti, which was attributed to the formation of Ti-rich regions and the corresponding raise of energy in grain boundaries. The fabricating strategies in this work may benefit the design of refractory tungsten alloys with less shrinkages and ultra-fine grains.
研究领域:
材料科学
·
核能工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2017
·
IF 3.387
Dan Wang,Ying Chen,Yang Zhang,Xintong Zhang,Norihiro Suzuki,Chiaki Terashima
Extremely rapid high temperature annealing (ER-HTA) was used to boost the photoelectrochemical (PEC) performance of hematite thin film deposited on a TiO 2 nanosheet-modified SnO 2 :F substrate (FTO-TN-HM). The PEC performance of FTO-TN-HM photoanodes were strongly enhanced with increasing ER-HTA temperatures from 700 to 820 °C with a holding time as short as 30 s. The photocurrent density of FTO-TN-HM photoanode treated by ER-HTA at 800 °C was 0.49 mA cm -2 and interfacial hole transfer efficiency of 32% was achieved at 1.23 V vs. RHE, which were 18.8 and 16 times as great as FTO-TN-HM photoanodes annealed at 500 °C for 30 min, respectively. The effect of ER-HTA on the PEC performance of FTO-TN-HM photoanodes were studied comparatively, which suggested that the improved crystallinity, decreased recombination through surface states, and enhanced interfacial Ti 4+ diffusion all contributed to their advanced PEC performance. Our studies confirm that the ER-HTA treatment is an effective method to improve the PEC properties of hematite photoanodes with TiO 2 underlayer and might be applicable for other semiconducting photoelectrodes to get better PEC performance.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）