THIN SOLID FILMS
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2024
·
IF 2
Xiaoyan Pan,Qingquan Zhang
This paper introduces a simple, robust and inexpensive method to create a thermal responsive coating for glass. The coating is a copolymer of N‑isopropylacrylamide (NIPAAm) and acrylamide (AAm), which can switch between clear and opaque states reversibly. The switching temperature can be adjusted from 32°C to 40°C by varying the percentage of acrylamide. The coating remains stable after switching 30 times and possesses switching function after six months storage at room temperature. These advanced properties enable the smart coating to be suitable for privacy and solar adaptive control.
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DOI
高影响因子
Nature Sustainability
·
2024
·
IF 25.7
Gao Zhiwen,Wang Yu,Yuan Lei,Shi Xinrui,Shang Yihao,Jiang Jingang,Zhang Min,Fang Shuhui,Zhang Wei,Liu Yue
Co-upcycling of mixed plastics offers a viable approach to reusing carbon resources in plastic wastes and realizing circular economy. However, the presence of polyvinyl chloride (PVC) often complicates the co-upcycling processes, because chlorine (Cl) released from PVC can deactivate catalysts and enter final products. Moreover, existing plastic upcycling processes usually require harsh reaction conditions. Here we present a strategy enabling efficient co-upcycling of PVC and polypropylene (PP) at mild conditions. We use chlorine-resistant ionic liquids butylpyridinium chloride-aluminium chloride to dechlorinate PVC and simultaneously depolymerize the PP–PVC mixture into Cl-free liquid hydrocarbons, with the co-production of hydrogen chloride (HCl) as byproduct. This conversion approach operates at room temperature without the use of external hydrogen or noble metal catalysts. The Cl-free liquid hydrocarbon yield is up to 97.4 wt% of C and H in the feed PP–PVC mixture. This work can incentivize further technical development in plastic upcycling and improve the sustainability of plastic waste management.
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CHINESE JOURNAL OF CHEMICAL ENGINEERING
·
2024
·
IF 3.7
Huijun Shang,Hengli Li,Weijun Li,Feng Pan,Zhan Du
In this paper, the effects of reaction parameters on the deep-reduction and carbonization process of WO 2 -Co to WC-Co were studied. The results indicate that oxygen loss rate of WO 2 is positively correlated with temperature and methane partial pressure. The partial pressure of methane has no significant effect on the formation rate of WC. The carbon content and particle size of the product increase with the increase of CH 4 partial pressure. By synergistically regulating the reaction temperature to 950 °C, methane partial pressure to 1.25%, and reaction time to 60 min, ultrafine WC-Co powder without η phase can be obtained. The particle size of the composite powder is 128 nm, with total carbon content of 6.16%, free carbon content of 0.4%, and residual oxygen content of 0.05%, respectively. The growth rate relationship of tungsten carbide is as follows:
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POLYMER
·
2021
·
IF 4.43
Jidong Dai,Min Liang,Zhigang Zhang,Katrien V. Bernaerts,Tianzhu Zhang
Poly (lactide- co -glycolide) (PLGA) has emerged as an important material in tissue engineering. However, lactic acid (LA) produced during PLGA degradation is prone to inflammation, which is a shortcoming that must be avoided. To this end, a method for preparing crystalline PLGA is described here by using cross-linking nucleation. The pentaerythritol (PET), L-lactide and glycolide were first used to prepare the four-armed PLGA (4arm-PLGA) via the ring-opening polymerization (ROP) method. Such symmetrical four-armed PLGA was then grafted and crosslinked with N’N-methylenebisacrylamide (MBAM) simultaneously, and finally obtained the crystalline 4arm-PLGA (C4-PLGA-M). The C4-PLGA-M has controllable crystallinity , which could effectively control the degradation rate of PLGA. The C4-PLGA-M were characterized by POM and WAXS , and the accelerated degradation tests of C4-PLGA-M showed a sixfold increase at most in the degradation time compared to alone four-armed PLGA. The results of cell culture confirmed that the reduction of LA from hydrolysis process could be beneficial to the cell growth. Such crystalline C4-PLGA-M is expected to have ideal performance in tissue engineering.
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LWT-FOOD SCIENCE AND TECHNOLOGY
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2018
·
IF 3.129
Hao-Xiang Gao,Zhi-Long Yu,Qiang He,Shan-Hu Tang,Wei-Cai Zeng
A potentially functional yogurt co-fermentation with Gnaphalium affine was prepared and its quality and antioxidant properties were investigated. According to the classic procedure, a novel yogurt was successfully prepared with Gnaphalium affine extract (EGA). During the storage period, the pH value and titratable acidity of yogurt showed no obvious changes compared with control. However, the texture properties of yogurt, such as firmness, adhesiveness, cohesiveness and springiness, could be effectively improved. Moreover, the yogurt possessed the lower syneresis susceptibility and higher viability of Lactobacillus bulgaricus and Streptococcus thermophilus than the control. Furthermore, the yogurt showed remarkable antioxidant potential to scavenge 2, 2′-azinobis-3-ethylbenzthiazoline-6-sulphonate (ABTS), 1,1-diphenyl-2-picrylhydrazyl (DPPH), superoxide and hydroxyl radicals. Meanwhile, the yogurt could enhance the activities of antioxidant enzymes, including superoxide dismutase (SOD), catalase (CAT) and glutathione peroxidase (GSH-Px), and it could also lead to a significant decrease of malondialdehyde (MDA) level in animal serums. The current results suggest that the yogurt co-fermentation with EGA possesses high quality properties and remarkable antioxidant potential, and thus has the great potential to be used as a novel functional food product in food industry.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Zhao Wang,Wenyue Zhao,Ze Li,Yazhou Peng,Chang Gao,Lei Shi,Wenjing Hua,Weidong Fei,Yu Zhao
The search for multiferroic materials with ferroelectric and ferromagnetic properties at room temperature continues to be driven by the prospect of new devices. In this paper, Ba 2+ -Ti 4+ co-doped Y 1- x (Ba 0.5 Ti 0.5 ) x FeO 3 were prepared by a traditional solid-state reaction method. The ferroelectricity and ferromagnetism of the co-doped ceramics have been enhanced simultaneously with the maximum polarization of 0.48 μC/cm 2 and the maximum magnetization of 3.25 emu/g, the switched charge density (0.26 μC/cm 2 ) measured by PUND tests indicating the intrinsic and switchable remanent polarization. The increase of Fe 2+ content (increased to 28 % with the increase of doping content) caused by Ba 2+ -Ti 4+ co-doping destroys the antiferromagnetic ground state, and the doping strategy enlarges the tilt angle of oxygen octahedron from 144.93° to 148.63°. The magnetic domain switches caused by the external electric field were directly observed by magnetic force microscopy, indicating the modulation of magnetic domain by polarization at room temperature. This work may provide useful information for the structural design and performance improvement of multiferroic materials.
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ULTRASONICS SONOCHEMISTRY
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2021
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IF 7.491
Yang Yang,Yiqing Feng,Kejian Li,Saira Ajmal,Hanyun Cheng,Kedong Gong,Liwu Zhang
Among the possible products of CO 2 electrochemical reduction, CO plays a unique and vital role, which can be an ideal feedstock for further reduction to C 2+ products, and also the important component of syngas that can be used as feedstock for value-added chemicals and fuels. However, it is still a challenge to tune the CO selectivity on Cu electrode. Here we newly construct an ultrasound-assisted electrochemical method for CO 2 reduction, which can tune the selectivity of CO 2 to CO from less than 10% to >80% at −1.18 V versus (vs.) reversible hydrogen electrode (RHE). The partial current density of CO production is significantly improved by 15 times. By in-situ Raman study, the dominating factor for the improved CO production is attributed to the accelerated desorption of *CO intermediate. This work provides a facile method to tune the product selectivity in CO 2 electrochemical reduction.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2020
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IF 4.65
Jianwen Ge,Yu Cui,Li Liu,Rui Li,Fandi Meng,Fuhui Wang
Rational design on the well wrapped core-shell microstructure of Co@ SiO x C composites was successfully conducted through reduction process of cobalt, efficient condensation reaction of KH-550 silane coupling agent as well as high temperature calcination . The SiO x C shell possessed 3D cross-linked network structure consisting of dielectric carbon and silicon composition for optimal electromagnetic matching. The microstructure, morphology, elements distribution, electromagnetic property and microwave absorption performance were fully characterized, respectively. This SiO x C shell effectively inhibited the agglomeration of cobalt particles, and regulated the complex electromagnetic parameters by decreasing permittivity and introducing polarization relaxation, all of which determined the efficient reflection loss with RL min value of −60.3 dB at 16.2 GHz and matching thickness of only 2.05 mm. Meanwhile, the effective absorption band is up to 7.1 GHz at 2.3 mm. By optimizing of core-shell structure and material components, the high-absorption performance was obtained through impedance matching, multi-interfacial polarizations, dipole (or defects) polarization and magnetic loss. Therefore, the Co@ SiO x C composites present a facile and promising route toward the design of large-scale-preparation and excellent microwave absorbing materials.
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CHINESE JOURNAL OF POLYMER SCIENCE
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2014
·Vol. 32
·期 5
·531-539
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IF 1.42
Xing Xin-ming,Liu Guang-ming,Ding Yan-wei,Zhang Guang-zhao
The lower critical solution temperature (LCST) behavior of poly(acrylamide- co -diacetone acrylamide) (poly(AM- co -DAM)) copolymer in aqueous solutions was studied. The results demonstrate the LCST linearly decreases as the molar fraction of DAM ( f
DAM ) increases. In the range of f
DAM < 0.36, the transmittance increases as f
DAM decreases because the more hydrophilic copolymer chains can form looser aggregates with a lower refractive index. The transmittance exhibits a minimum when f
DAM is less than 0.28 as the chains form micelle-like structure with a size smaller than the wavelength. The LCST decreases with the initial polymer concentration, but it levels off when the polymer concentration is high enough. Moreover, no hysteresis can be observed in the change of transmittance during the heating-cooling process because no additional hydrogen bonds are formed in the collapsed state due to the steric hindrance of the large side groups in DAM units.
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JOURNAL OF THE ENERGY INSTITUTE
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2020
·
IF 4.748
Wei Luo,Qing Hu,Zhong-yi Fan,Jun Wan,Bin Luo,Zhi-xiang Yan,Sheng-Xiong Huang,Zhi Zhou
Reworked synthetic polymers (RSPs) are industrial raw materials obtained from waste synthetic polymer (WSP) through physical or chemical means. Different reworked synthetic polymers have different pyrolysis characteristics and synergistic reactions during co-pyrolysis process. The effect of reworked polyamide 6 (PA6), thermoplastic elastomer (TPE), black polypropylene (PP1) and green polypropylene (PP2) co-pyrolysis on the yield and quality of pyrolysis products has been conducted. The results show that co-pyrolysis promotes the degradation of RSPs into more gases. Co-pyrolysis improves the light component of liquid oils and reduces the O content, which is beneficial for liquid fuels. Except for TPE + PP2, co-pyrolysis of RSPs increased di-aromatics, poly-aromatics and aromatic compounds. TPE + PP2 and PP1+PP2 produced high aliphatic compounds including the long chain aliphatic compounds without sufficient degradation, which resulted in the contents of over C 20 were high. In the pyrolysis gases , the relative content of H 2 was increased in all mixed RSPs co-pyrolysis, which can be used as clean fuels. The X-ray diffraction (XRD) analysis shown that new components were found and old components disappeared in co-pyrolysis, indicating chemical reaction had occurred between two different types of RSPs.
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OPTICAL MATERIALS
·
2017
·
IF 2.238
Jiawei Dai,Yubai Pan,Wei Wang,Wei Luo,Tengfei Xie,Huamin Kou,Jiang Li
Terbium aluminum garnet (TAG) precursor was synthesized by a co-precipitation method from a mixed solution of terbium and aluminum nitrates using ammonium hydrogen carbonate (AHC) as the precipitant. The powders calcined at different temperatures were investigated by XRD , FTIR and FESEM in order to choose the optimal calcination temperature. Fine and low-agglomerated TAG powders with average particle size of 88 nm were obtained by calcining the precursor at 1100 °C for 4 h. Using this powder as starting material, TAG transparent ceramics were fabricated by vacuum sintering combined with hot isostatic pressing (HIP) sintering. For the sample pre-sintered at 1700 °C for 20 h with HIP post-treated at 1700 °C for 3 h, the average grain size is about 3.9 μm and the in-line transmittance is beyond 55% in the region of 500–1600 nm, reaching a maximum transmittance of 64.2% at the wavelength of 1450 nm. The Verdet constant at 633 nm is measured to be −178.9 rad T −1 m −1 , which is 33% larger than that of the commercial TGG single crystal (−134 rad T −1 m −1 ).
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Journal of the Taiwan Institute of Chemical Engineers
·
2016
·
IF 2.848
Huan Liu,Yi Lin,Zhen Ma
Au/M-P-O (M = Mg, Al, Ca, Fe, Co, Zn, La) catalysts were prepared by loading ca. 1 wt.% gold onto commercial metal phosphate supports by deposition-precipitation with urea (DPU), and tested in CO oxidation. Au/La-P-O showed the highest activity, achieving complete CO conversion at 70 °C. Au/Ca-P-O was the second most active, achieving complete CO conversion at 155 °C. The remaining catalysts were not active below 200 °C. In view of the results, we additionally prepared Au/LaPO 4 nanowires by loading ca. 1 wt.% gold onto LaPO 4 nanowires via DPU. The Au/LaPO 4 nanowires catalyst was even more active, achieving complete CO conversion at 15 °C. The catalysts were characterized by N 2 adsorption-desorption, inductively coupled plasma optical emission spectroscopy (ICP-OES), X-ray diffraction (XRD), transmission electron microscopy (TEM), X-ray photoelectron spectroscopy (XPS), and temperature-programmed desorption of O 2 or CO 2 (O 2 -TPD, CO 2 -TPD). Reasons for the higher activity of Au/LaPO 4 nanowires were discussed.
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