FOOD CHEMISTRY
·
2023
·
IF 8.8
Yongshuai Jing,Yameng Zhang,Meng Yan,Ruijuan Zhang,Beibei Hu,Shiguo Sun,Danshen Zhang,Yuguang Zheng,Lanfang Wu
Crataegus pinnatifida is a common food in China, Europe and North America. In order to confirm polysaccharide was the material basis for C. pinnatifida to exert immune regulation. A polysaccharide (CPP) with a molecular weight of 13.58 kDa was isolated from C. pinnatifida . The structure of CPP was determined to be a backbone composed of → 3,5)-α- l -Ara f -(1→, with two branches consisting of → 4)-α- d -Gal p -(1 → and → 5)-α- l -Ara f -(1→, with α- l -Ara f and α- d -Man p as the terminal unit. CPP (10 ∼ 500 μg/mL) could promote the secretion of nitric oxide, interleukin-2, interleukin-6 and tumor necrosis factor-α in vitro . CPP could significantly restore the body weight of immunosuppressive mice and improve the immune organ index and interleukin-2, interleukin-6, and tumor necrosis factor-α secretion. In addition, CPP increased the abundance of Bacteroidetes and Verrucomicrobia and decreased the abundance of Proteobacteria at the phylum level. So CPP can regulate the gut microbiota and play an important role in immune regulation.
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Small
·
2023
·Vol. 19
·期 19
·2208177
·
IF 13.3
Shuo Li,Yu-Jie Sun,Zhao-Xu Wang,Cheng-Gang Jin,Ming-Jie Yin,Quan-Fu An
Mixed matrix membranes (MMMs), conjugating the advantages of flexible processing-ability of polymers and high-speed mass transfer of porous fillers, are recognized as the next-generation high-performance CO 2 capture membranes for solving the current global climate challenge. However, controlling the crystallization of porous metal-organic frameworks (MOFs) and thus the close stacking of MOF nanocrystals in the confined polymer matrix is still undoable, which thus cannot fully utilize the superior transport attribute of MOF channels. In this study, the “confined swelling coupled solvent-controlled crystallization” strategy is employed for well-tailoring the in-situ crystallization of MOF nanocrystals, realizing rapid (<5 min) construction of defect-free freeway channels for CO 2 transportation in MMMs due to the close stacking of MOF nanocrystals. Consequently, the fabricated MMMs exhibit approximately fourfold enhancement in CO 2 permeability, i.e., 2490 Barrer with a CO 2 /N 2 selectivity of 37, distinctive antiplasticization merit, as well as long-term running stability, which is at top-tier level, enabling the large-scale manufacture of high-performance MMMs for gas separation.
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JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2023
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IF 10.9
Yu Zhang,Qiang Gao,Xianzhe Sheng,Shuai Zhang,Junjie Chen,Yan Ma,Jianbin Qin,Yongsheng Zhao,Xuetao Shi,Guangcheng Zhang
The design and fabrication of electromagnetic interference shielding films with a novel structure to eliminate undesirable electromagnetic pollution is an important research direction. However, it is still a challenge to combine and organize nanofillers in different dimensions into the structured network in polymer-based electromagnetic interference (EMI) shielding composites. In this work, a sandwich structure polyimide (PI) composite film with alternative 2D-MXene network and 1D-Silver nanowires (Ag NWs) network was prepared through the “electrospinning-immersion-hot pressing” method. With the increase of Ag NWs content, the EMI shielding effectiveness (SE) gradually increases while maintaining good flexibility and mechanical robustness. The EMI SE and the tensile strength of 150 μm thick sandwich composite film can reach up to 79.54 dB and 39.82 MPa, respectively. The prepared flexible and robust PI composite film with a sandwich structure has high EMI SE with less metal content, which can provide guidelines for the development of high-performance EMI polymeric films with potentials in wearable devices and equipment.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
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IF 6.2
Xiaoqing Wang,Jing Zhang,Rui Wang,Yujie Ren,Shiyao Jin,Shimin Wang,Hongjing Lu,Yongjiang Wang,Junzi Zhao,Chunhua Xiong
We present a strategy for the modification of an ion-exchange resin (D113) as an inexpensive carbon source to obtain a macrospherical photocatalyst precursor that can be transformed into a stable all-solid-state Z-scheme heterojunction catalyst (denoted Bi 2 O 3 -Co 3 O 4 @C). X-ray diffractometry and Fourier transform infrared and Raman spectroscopy measurements confirmed the presence of highly graphitized carbon in the complex. Significantly, the cost of the as-prepared material was only 1/200 of that of commercial carbon nanotubes and 1/80 of that of graphene oxide . Aided by the organic carbon source, Bi 2 O 3 -Co 3 O 4 @C showed an enhanced light absorption, hindered electron–hole recombination, and an enhanced photocurrent response. Under simulated solar irradiation, Bi 2 O 3 -Co 3 O 4 @C (20 mg/L) showed degradation efficiencies of 100%, 47.52%, 94.28%, and 100% for methylene blue, rhodamine B, tetracycline, and Cr(VI), respectively, after 120 min. Herein, the highest turnover frequency (TOF) obtained under irradiation was 2.5 h −1 for Cr(VI). Further, the degradation efficiency for methylene blue trihydrate remained 91.46% after five cycles, indicating significantly higher stability than that of a catalyst prepared without graphitic carbon. The optimized band structure and photocatalytic mechanism of Bi 2 O 3 -Co 3 O 4 @C were determined based on ultraviolet-visible measurements and plane-wave density functional theory calculations in VASP. The findings of this study indicate the promise of the Bi 2 O 3 -Co 3 O 4 @C macrospheres for industrial applications based on their photocatalytic performance, high stability, low cost, and suitable particle size.
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APPLIED SURFACE SCIENCE
·
2023
·
IF 6.7
Hong Guo,Boyang Hu,Qin Wang,Jun Liu,Ming Li,Baoan Li
Urged by the increasing power density of electronics, efficient heat dissipation by graphene-embedded polymer composites with high thermal conductivity ( λ ) has become a growing demand for addressing overheating issues. However, it is still challenging to achieve a λ over 20 W m −1 K −1 below 20 wt% loading. Herein, we report a highly thermally conductive polymer composite based on self-assembled construction of horizontally aligned graphene/silver ( f -GE/Ag) heterostructure, which is fabricated by in-situ deposition of ultra-small Ag nanoparticles on functionalized graphene followed by stress-induced orientation process, consequently achieving efficient heat-transfer pathways with low interfacial thermal barriers. The resultant f -GE/Ag contributes to the composite with a high λ of 25.22 W m −1 K −1 at 15 wt% loading, giving an ultra-high λ enhancement over 12500 %. Additionally, the thermal management application of composites as thermal interface materials integrated with power LEDs is demonstrated. The finding raises the possibility for practical application of high-performance polymer composites in the thermal management of electronics.
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Analytical Methods
·
2023
·Vol. 15
·期 7
·925-936
·
IF 3.1
Li-xin Ding,Yong-qiang Wang,Xue Sun,Zhao-qi Jiang,Xiao-yu Wang,Yan-fen Zhou,Xing-yu Hou
In this study, 3-carboxyphenylboronic acid (CP)-functionalized amino-modified Fe3O4 (Fe3O4@NH2-CP, FNC) magnetic molecularly imprinted polymers (FNC@MIPs) were synthesized and applied for the quick identification and selective separation of luteolin (LTL). The structure and morphology were characterized in detail by Fourier transform-infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), dynamic light scattering (DLS), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), thermogravimetric analysis (TGA), and vibrating specimen magnetometry (VSM) methods. The FNC@MIPs had a homogeneous shape, excellent magnetic characteristics, quick binding kinetics, a high adsorption capacity, acceptable selectivity, and stable reusability. The solid-phase extraction parameters and preparation conditions were both optimized. Under optimized conditions, the maximal adsorption capacity was 14.26 mg g−1 and the imprinting factor was 3.62. Furthermore, the experimental kinetics data were best fitted with the pseudo-first-order model (R2 = 0.9877), and the Langmuir model could describe the adsorption process (R2 = 0.9979), suggesting a monolayer covering. The practical application of the sorbent for LTL detection in Lonicera japonica Thunb samples showed recoveries in the range of 84.5–108.7%. Therefore, the strategy offers a fresh avenue for the extraction and purification of LTL.
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ADVANCED POWDER TECHNOLOGY
·
2023
·
IF 5.2
Ronglin Zhao,Yaqiang Dong,Shouding Wu,Xubin Li,Zhonghao Liu,Xingjie Jia,Xincai Liu,Hang Wu,Wei Gao,Aina He,Jiawei Li
The insulation coating plays a crucial role in minimizing core loss ( P cv ) in soft magnetic powder cores (SMPCs). In this work, we prepared ZrO 2 coating layer on FeSiBNbCu spherical powder by the hydrolysis-precipitation method and investigated the magnetic properties of the FeSiBNbCu@ZrO 2 nanocrystalline SMPCs. ZrO 2 coating layer were successfully fabricated on the powder by adding a proper amount of K 2 ZrF 6 in alkaline ethyl alcohol solution. The micromorphology and chemical structure of the ZrO 2 coating layer on the surface of FeSiBNbCu nanocrystalline powder, as well as the conversion mechanisms, has been investigated. The presence of the ZrO 2 coating reduces the P cv by significantly lowers eddy loss ( P e ) of the nanocrystalline SMPCs, meanwhile improves DC bias performance and slightly decreases their permeability. When the additive amount of K 2 ZrF 6 is 1.0 wt%, the nanocrystalline SMPCs has best comprehensive soft magnetic properties, including stable effective permeability ( μ e ) of 57.8 up to 1 MHz, excellent DC bias performance of 59.3 % at a bias field of 100 Oe, and the lowest P cv of 194.7 mW/cm 3 at a frequency ( f ) of 150 kHz and maximum magnetic induction ( B m ) of 50 mT.
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Journal of Materials Research and Technology-JMR&T
·
2023
·
IF 6.4
Guangshuo Wang,Fangfang Si,Yingying Ma,Yanming Wang,Zhixiao Zhang,Ruitao Yu,Xiaoliang Zhang,Guoqing Chang,Jingbo Mu,Hongwei Che,Ping Li,Dong Li
A kind of novel two-dimensional magnetic nanocomposites were successfully fabricated via the immobilization of Fe 3 O 4 nanoparticles onto the surface of graphitic carbon nitrogen (g-C 3 N 4 ) nanosheets by a facile liquid exfoliated method and subsequent solvothermal reaction. The structural, morphological, compositional, thermal and magnetic characteristics of the as-prepared samples were systematically assessed by employing a wide spectrum of characterization techniques. Subsequently, the as-constructed Fe 3 O 4 /g-C 3 N 4 composites were exploited to fabricate a stable magnetorheological (MR) suspension, and the rheological performances and sedimentation stability of the designed MR fluid were evaluated through a rotational rheometer and a visual observation method, respectively. The experimental results revealed that the established MR fluid demonstrated an obvious enhancement in sedimentation stability in comparison with that of another a kind of suspension containing carbonyl iron particles. The higher sedimentation stability realized in this MR smart system can be associated primarily with the dispersed Fe 3 O 4 /g-C 3 N 4 composite particles with ultrathin sheet-like nanostructure and the reduced density mismatch.
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FUEL
·
2023
·
IF 7.4
Xiaoping Wang,Lin Xu,Jianhua Song,Muhammad Asif Nawaz,Dianhua Liu
In the synthesis of polyoxymethylene dimethyl ethers (PODE n ) from formaldehyde (FA) and methanol (MeOH) solution, the methanol conversion and PODE n selectivity are unsatisfactory because the presence of water limits the adsorption of reactants on acid sites and leads to the hydrolysis of some products. Herein, polystyrene-based hybrid solid acids with tunable hydrophobicity and high acid density were synthesized by post-synthesis grafting method in this work. The prepared catalysts were investigated by BET, SEM, TEM, FT-IR, and acid-base titration. The results demonstrated that the surface property of the catalyst could be changed from hydrophilicity to hydrophobicity with the increase of organic group chain length, which effectively improved methanol conversion and PODE 3-6 selectivity. The correlation between contact angles and turnover frequency (TOF) was investigated, suggesting that the TOF of polystyrene-based hybrid solid acids treated with octadecyl trichlorosilane was 2.0 times higher than that of untreated ones. Moreover, a supposed reaction pathway for the synthesis of PODE n from formaldehyde and methanol was proposed, indicating that the improvement of hydrophobicity promoted the decrease of local water concentration in the catalyst, thus facilitating the stabilization of carbocations.
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OPTICAL MATERIALS
·
2022
·
IF 3.754
Zhenzhen Huang,Yanxin Wang,Xianhang Yan,Xinhui Mao,Zhiyuan Gao,Matt J. Kipper,Linjun Huang,Jianguo Tang
In this work, a luminescent lanthanide complex, namely, Eu(tta) 3 phen (Eu = europium , tta = 2-thenoyltrifluoroacetone, phen = 1, 10-phenanthroline) is used as a luminescent dopant to prepare fluorescent nanofiber films. The resulting nanofibers (CS/PEO-SiO 2 @Eu(tta) 3 phen) are composed of chitosan and polyethylene oxide containing silica nanoparticles , encapsulating the Eu(tta) 3 phen. The nanofibers are stabilized by treatment with sodium bicarbonate (NaHCO 3 ) aqueous solution as neutralizer and then repeatedly washed with deionized water. A more stable Na-CS/PEO-SiO 2 @Eu(tta) 3 phen fiber film is obtained as a fluorescence sensor for Cu 2+ ions. The Na-CS/PEO-SiO 2 @Eu(tta) 3 phen has high sensitivity, and a wide detection range. The response is linear in the concentration range from 10 to 90 μmol/L, and the detection limit is 0.826 μmol/L. In addition, Na-CS/PEO-SiO 2 @Eu(tta) 3 phen nanofiber film can be used as a recyclable sensor for the detection of Cu 2+ ions in aqueous solution due to its good recyclability, selectivity and rapid optical response.
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RSC Advances
·
2022
·Vol. 12
·期 52
·34107-34116
·
IF 4.036
Chuanfeng Zang,Hao Chen,Xiangye Han,Wei Zhang,Junfang Wu,Fanghua Liang,Jiamu Dai,Hongchao Liu,Guangyu Zhang,Ke-Qin Zhang,Mingzheng Ge
PVDF/ZnO/CuS photocatalysts with ZnO/CuS heterojunctions were synthesized via electrospinning, hydrothermal, and ion-exchange techniques. As matrix materials, electrospun PVDF nanofibers are easy to be recycled and reused. ZnO nanorods anchored on PVDF nanofiber with high specific surface area provide abundant active reaction sites for photocatalysis. While the loaded CuS nanoparticles as a photosensitizer compensate the low quantum efficiency of ZnO and improve the visible-light photocatalytic efficiency. As a result, the PVDF/ZnO/CuS composited photocatalyst exhibits outstanding photocatalytic performance in exposure to UV and visible light owing to the suppressed recombination of electron–hole pairs and widened visible light absorption range. The kinetic constants of PVDF/ZnO/CuS nanocomposites under UV irradiation (9.01 × 10−3 min−1) and visible light (6.53 × 10−3 min−1) irradiation were 3.66 and 2.53 times higher than that of PVDF/ZnO (2.46 × 10−3 min−1 & 2.58 × 10−3 min−1), respectively. Furthermore, PVDF/ZnO/CuS nanocomposites demonstrate excellent robustness in terms of recycling and reuse, which is advantageous in practical applications.
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CARBOHYDRATE POLYMERS
·
2022
·
IF 10.723
Xuchu Yin,Tao Zhang,Tongqing Zhao,Ke Wang,Zhiguang Xu,Yan Zhao
Cellulose-based, closed-cell porous materials templated from emulsions are promising for thermal insulation, but their low stability imposed by physical interaction hinders the materials from real applications. Herein, we report the fabrication of cellulose-based, flexible polyurethane polyHIPEs with quasi-closed-cell structures, high stability and flexibility for thermal insulation. The polyHIPEs were prepared from cellulose-stabilized Pickering high internal phase emulsions through interfacial crosslinking using isocyanate . The resulting polyurethane polyHIPEs showed controllable external shapes, quasi-closed-cell structures, high flexibility, low density, and robust compression (without fracture even after compression to 30 % original height). The crosslinking enabled the polyHIPEs to show hydrophobicity , good stability (without breakage and dissolution observed after immersing in NaOH solution at pH 12, HCl solution at pH 1 and hot water at 100 °C, for 24 h) and decreased moisture uptake (below 1 %). The low density and quasi-closed-cell structures endowed the polyHIPEs with high thermal insulation, with thermal conductivity as low as 33.1 mW/(m K). These features make the cellulose-based, closed-cell polyHIPEs as an excellent candidate for thermal insulting.
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