JOURNAL OF FLUORESCENCE
·
2022
·Vol. 32
·期 2
·783-789
·
IF 2.525
Xu Lina,Yao Na,Ding Haiyang,Yang Xiaohua,Li Shouhai,Xia Jianling,Li Mei
Selective and sensitive water content measurement in organic solvents is extremely significant for both industrial use and laboratory preparation. Carbon nanodots are promising carbon nanomaterials with unique and novel properties and thus have drawn growing attention. However, the hydrothermal approach for the preparation of carbon dots always uses water as solvent, and consequently, the development of carbon dots from biomass materials for fluorescence detection of water content remains unexplored. Here, carbon dots were prepared from gallic acid via a cheap and facile one-step method. The as-prepared carbon dots present excellent sensitivity and selectivity toward water content and exhibits good linear relationships with water content in range of 0–10%. The carbon dots demonstrated a strong antioxidation capacity and colour-reaction of Fe 3+ like gallic acid. The carbon dots also showed solid-state lighting.
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高影响因子
Stem Cell Research & Therapy
·
2022
·Vol. 13
·期 1
·1-15
·
IF 8.079
Liu Fengyi,Wang Xu,Li Yuzhou,Ren Mingxing,He Ping,Wang Lu,Xu Jie,Yang Sheng,Ji Ping
Background Cartilage defects pose a significant burden on medical treatment, leading to an urgent need to develop regenerative medicine approaches for cartilage repair, such as stem cell therapy. However, the direct injection of stem cells can result in insufficient delivery or inaccurate differentiation. Hence, it is necessary to choose appropriate stem cell delivery scaffolds with high biocompatibility, injectability and chondral differentiation induction ability for cartilage regeneration.Methods In this study, the photocrosslinked gelatin methacrylate (GelMA) hydrogel with high cell affinity and plasticity was selected and strengthened by incorporating methacrylic anhydride-modified poly(amidoamine) (PAMAM-MA) to fabricate an adipose-derived stromal/stem cells (ASCs) delivery scaffold for cartilage repair. The physiochemical properties of the GelMA/PAMAM-MA hydrogel, including the internal structure, stability and mechanical properties, were tested. Then, ASCs were encapsulated into the hydrogels to determine the in vitro and in vivo chondrogenic differentiation induction abilities of the GelMA/PAMAM-MA hydrogel.Results Compared with the GelMA hydrogel, the GelMA/PAMAM-MA hydrogel exhibited more uniform structure, stability and mechanical properties. Moreover, on the basis of good biocompatibility, the hybrid hydrogel was proven to exert a sufficient ability to promote cartilage regeneration by in vitro three-dimensional (3D) culture of rASCs and in vivo articular cartilage defect repair.Conclusion sThe injectable photocrosslinked GelMA/PAMAM-MA hydrogel was proven to be a capable stem cell carrier for cartilage repair and provides new insight into the design strategy of stem cell delivery scaffolds.
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IONICS
·
2022
·Vol. 28
·期 3
·1129-1141
·
IF 2.961
Zhu Shuyuan,Wang Zhijun,Liu Xinglong,Cao Qiyi,Wen Yadong,Cao Ruozhao,Wu Zhiqing,Zhou Cong,Jin Ying,Tao Feng
As a hopeful material for energy storage, helical carbon fibers (HCFs) have attracted wide attention due to their unique morphology and superior properties. However, the facile synthesis of HCFs with high specific surface area (SSA) and good electrochemical performance is still a challenge. In this study, we synthesized HCFs through a catalyst-free strategy using the helical vessels (HVs) extracted from tea as the bio-template and further obtained the helical porous activated carbon fibers (HPACFs) by KOH activation. The as-prepared HPACFs exhibited a high SSA (3124 m 2 ·g −1 ) and developed pore structure, which provided efficient migration of electrolyte ions and electrons, and thus exhibited excellent electrochemical performance for energy storage. For example, HPACF-5 exhibited a specific capacitance of 488 F·g −1 (at 0.5 A·g −1 ) in a three-electrode system and 187 F·g −1 (1 A·g −1 ) in a two-electrode system, with good cyclic stability (loss ~7% after 3000 cycles at 20 A·g −1 ). The helical porous structure with such high SSA provided a combination of defect sites, sufficient active sites, and nanoporous regions in the bends for ion storage. In addition, these structures also improve the ion diffusion and charge transfer during the discharge process, which is in favor of optimized electrolyte ion and energy storage equipment.
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JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 2
·1069-1083
·
IF 4.682
He Ziguo,Zhang Cheng,Zhang Jian,Liu Shengjun,Sun Yudie,Chen Qian,Chu Zhaolian,Ye Mingfu,Zhang Kui
Color-tunable luminescent polymer composite materials are desired for applications in light-emitting diodes. Herein, we directly use commercial humic acid as precursor to fabricate carbon dots by one-step hydrothermal method in formic acid and hydrogen peroxide solution. It is found that the size distribution of synthesized carbon dots ranges from 2 to 5 nm, and the carbon dots display concentration-dependent multi-color luminescence in formic acid, N,N-dimethylformamide and deionized water under 365-nm UV light, separately. The quantum yield of the as-made carbon dots with broad color tunability (445–587 nm) in formic acid is about 20% at 0.3125 mg/ml. Furthermore, by adjusting the concentration of carbon dots in polyvinyl alcohol, the composite films emit blue, cyan and light yellow fluorescence and the Commission Internationale de L’Eclairage color coordinates vary from (0.19, 0.23), through (0.25, 0.35) to (0.29, 0.40) at the content of CDs 3, 5 and 7 wt.% under the excitation of 365 nm, respectively. Meanwhile, the transmittance of the composite film at 5 wt.% is maintained at 81.8 to 87.2% of the pure polyvinyl alcohol film at 550 nm wavelength. This work provides an innovative, simple and efficient way to prepare concentration-dependent polychromatic carbon dots composite films, and the obtained multi-color light-emitting composites have a wide range of photoluminescence spectra, covering most of the visible light range, which opens up the possibility of applying these materials in the fields of optoelectronic materials. Graphical Abstract
An innovative, simple and efficient way to fabricate concentration-dependent multi-color CDs/PVA composite films, which promote the application of CDs in the fields of optoelectronic materials.
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JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 4
·2584-2596
·
IF 4.682
Jiao Enxiang,Wu Kun,Liu Yingchun,Zhang Hangzhen,Zheng Haoting,Xu Chang-an,Shi Jun,Lu Mangeng
The development of materials with efficient heat dissipation capabilities and remarkable mechanical properties is essential for high-power integrated electronic devices and flexible smart devices. Herein, a flexible cellulose nanofibers (CNF)/nanodiamond (ND)/MXene (CNM) composite film with typical nacre-like structure is fabricated using a facile vacuum-assisted filtration approach. The composite film exhibits high thermal conductivity of 17.43 W m −1 K −1 at the thickness of 21 μm, which enhances 663% compared with CNF film. This is mainly due to the bridging effect of ND and the favorable orientation of MXene nanosheets. In addition, nacre-like structure and strong hydrogen bonding between MXene and CNF endow satisfactory mechanical properties (89.14 ± 3.61 MPa). Moreover, it is worth to note that the film exhibits improved electrical insulation (1.63 × 10 6 Ω cm) on account of the intervene of the insulating ND block the conductive path formed by MXene. Therefore, the CNM composite films provide a feasible choice of thermal management components for high-power flexible devices.
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JOURNAL OF MATERIALS SCIENCE
·
2022
·Vol. 57
·期 2
·1019-1035
·
IF 4.682
Wang Zhen,Tao Jie,Shen Yizhou,Liu Senyun
Composite film heater is becoming the focus of research in the deicing field, owing to its advantages of high electro-thermal efficiency and lightweight. In this work, a new composite film heater with ultralow conductive filler was designed and prepared by mixing insoluble ethyl vinyl acetate (EVA) and soluble polyvinylidene fluoride (PVDF) in dimethylformamide (DMF). It is common sense that many insoluble EVA fillers degrade mechanical properties due to the macro-interface defect. The molecular dynamic simulation indicated that interfacial blending regions were formed more easily between molten EVA and soluble PVDF on account of the similar solubility parameter and stronger adsorption energy between Vinyl acetate segmer and PVDF segmer. The semi-compatible system was favorable to eliminate the macro-interface defect between EVA and PVDF partially. The film heater showed better tensile strength, flexibility, and bending durability after heat treatment of 80 °C. Moreover, the film heater had an outstanding heating effect, fast electro-thermal response time, low-energy consumption, and excellent thermal cycling stability. It achieved the steady-state temperature of 117.4 °C and the heating rate of 1.348 °C/s when the ratio of PVDF to EVA was 1:1 and the amount of CNT was only 10% at 28 V. The optimal ratio of CNT and EVA could construct a double reticular structure, consists macroscopic and microscopic conductive network at the same time, thereby reducing the content of conductive filler significantly. Furthermore, the deicing experiment manifested that the icicle fell after 29 s at 28 V, much shorter than without loading current. The integrated CNT@EVA/PVDF composite film heater contributes to a better understanding of the low percolation effect and the distribution mechanism between molten EVA and soluble PVDF, which could conduce to the development of novel electro-thermal deicing film in future.
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Food Biophysics
·
2023
·
IF 3
Wang Gang,Wang Dan,Huang Min
Electron beam irradiation (EBI) is now an effective and eco-friendly method to modify the properties of starch. In this study, wheat flour was irradiated at 10 MeV/up to 25 kGy of the electron beam, to analyze the effects of EBI on functional properties and the structure of wheat starch. The functional properties of wheat flour treated by EBI showed an increase in solubility from 15.19% to 50.48%, an increase in water/oil adsorption from 77.67% and 75% to 88.33% and 89.9%, and a decrease in swelling from 12.73 g/g to 5.98 g/g compared to the unirradiated wheat flour. EBI also decreased the rapidly digestible starch and therefore, increase the slowly digestible starch and resistant starch content. The structure of starch was characterized by scanning electron microscopy (SEM), polarized light microscopy (PLM), X-ray diffraction (XRD), and Fourier transform infrared spectroscopy (FTIR), indicating that the long-range crystal structure and short-range ordered structure of wheat starch by EBI decreased. Our results, therefore, may provide some detailed understanding of functional property changes of high starch-based foods by electron beam irradiation treatment technology.
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Science China-Materials
·
2023
·Vol. 66
·期 7
·2863-2871
·
IF 8.1
Lu Runzhi,Fang Zizheng,Jiang Yongbo,Zhao Qian
Ice templating that uses water as a green porogen has emerged as an eco-friendly and promising approach to fabricating porous materials. However, foams prepared from aqueous solutions are typically water-intolerant owing to their hydrophilic nature. Hydrophobic foams can also be prepared through the freezing of dispersions, but extra organic solvents are often required, making it environmentally unfriendly. Herein, we develop photo-cross-linking of ice templated emulsions to produce multifunctional porous materials based on emulsifier-free photosensitive emulsions. The whole porogenation process is relatively fast (within several minutes) without freeze-drying, facilitating the roll-to-roll continuous production of porous polymers. The material versatility can be expanded with different formulations, including soft foams with high stretchability, rigid materials providing tunable shape memory properties, and hierarchical porous ceramics enabling thermal insulation. This approach is environmentally friendly and economically attractive, and the principle can be extended to diverse precursors for the production of functionalized porous materials.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 45
·100596-100612
·
IF 5.8
Liu Shuai,Kang Yong,Hua Weijie
It is essential to develop an efficient technology for the elimination of refractory contaminants due to their high toxicity. In this study, a novel underwater bubbling pulsed discharge plasma (UBPDP) system was proposed for the degradation of Orange II (OII). The degradation performance experiments showed that by enhancing the peak voltage and pulse frequency, the degradation efficiency of OII increased gradually. The removal efficiencies under different air flow rates were close. Reducing OII concentration and solution conductivity could promote the elimination of OII. Compared with neutral and alkaline conditions, acidic condition was more beneficial to OII degradation. The active species including ·OH, ·O 2 − , 1 O 2 , and hydrated electrons were all involved in OII degradation. The concentrations of O 3 and H 2 O 2 in OII solution were lower than those in deionized water. During discharge, the solution pH increased while conductivity decreased. The variation of UV–vis spectra with treatment time indicated the effective decomposition of OII. Possible degradation pathways were speculated based on LC-MS. The toxicity of intermediate products was predicted by the Toxicity Estimation Software Tool. Coexisting constituents including Cl − , SO 4 2− , HCO 3 − , and humic acid had a negative effect on OII removal. Finally, the comparison with other technology depicted the advantage of the UBPDP system.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·
IF 5.8
Yao Guixiang,Fang Shuju,Yin Pengyuan,Li Ailing,Yang Wenrong,Wang Hongbin,Tan Wei
A novel colorimetric/fluorescent probe (AgNPs-GSH-Rh6G2) was prepared by linking silver nanoparticles (AgNPs) with rhodamine 6G derivative (Rh6G2) using glutathione (GSH) as a linker molecule. The prepared probe showed obvious fluorescence change and colorimetric response after adding copper ions. Based on this phenomenon, a colorimetric/fluorescence dual-mode detection method was constructed to recognize copper ions. The linear ranges of fluorescence detection and colorimetric detection were 0.10 to 0.45 mM and 0.15 to 0.65 mM, respectively, and the limit of detection were 0.18 μM and 24.90 μΜ. In addition, the dual-mode probe has achieved satisfactory results in the detection of copper ions in sediment samples. The successful construction of AgNPs-GSH-Rh6G2 not only provide a reliable tool for the detection of copper ions, but also shed light on a new idea for the multi-mode development of the detection platform.
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MICROCHIMICA ACTA
·
2023
·Vol. 190
·期 9
·1-11
·
IF 5.7
Liu Yujie,Gao Ran,Liu Xingcen,Zheng Jinhua,Wu Xia
Curcumin (Cur) possesses diverse biological and pharmacologic effects. It is widely used as a food additive and therapeutic medicine. A study to determine a sensitive detection method for Cur is necessary and meaningful. In this work, double rare earth ions co-doped fluorescent coordination polymer nanoparticles (CPNPs) were developed for the Cur detection. The CPNPs were synthesized by using adenosine monophosphate (AMP) as bridge ligands via coordination self-assembly with Ce 3+ and Tb 3+ . The AMP-Ce/Tb CPNPs exhibited the characteristic green fluorescence of Tb 3+ and had high luminescence efficiency. Under the optimal conditions, the fluorescence intensity of AMP-Ce/Tb CPNPs could be significantly quenched by Cur. The fluorescence quenching extent at λ ex / λ em of 300 nm/544 nm showed a good linear relationship with the Cur concentration in the range of 10 to 1000 nM. The detection limit was as low as 8.0 nM ( S/N = 3). This method was successfully applied to the determination of Cur in real samples with satisfactory results. The luminescence mechanism of AMP-Ce/Tb CPNPs and the fluorescence quenching mechanism of the CPNPs by Cur were both examined. Graphical abstract
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NATURE
·
2023
·Vol. 622
·期 7983
·493-498
·
IF 64.8
Han Dongyuan,Wang Jie,Agosta Lorenzo,Zang Ziang,Zhao Bin,Kong Lingmei,Lu Haizhou,Mosquera-Lois Irea,Carnevali Virginia,Dong Jianchao,Zhou Jianheng,Ji Huiyu,Pfeifer Lukas,Zakeeruddin Shaik M.,Yang Yingguo,Wu Bo,Rothlisberger Ursula,Yang Xuyong,Grätzel Michael,Wang Ning
Lead halide perovskite light-emitting diodes (PeLEDs) have demonstrated remarkable optoelectronic performance 1 , 2 , 3 . However, there are potential toxicity issues with lead 4 , 5 and removing lead from the best-performing PeLEDs—without compromising their high external quantum efficiencies—remains a challenge. Here we report a tautomeric-mixture-coordination-induced electron localization strategy to stabilize the lead-free tin perovskite TEA 2 SnI 4 (TEAI is 2-thiopheneethylammonium iodide) by incorporating cyanuric acid. We demonstrate that a crucial function of the coordination is to amplify the electronic effects, even for those Sn atoms that aren’t strongly bonded with cyanuric acid owing to the formation of hydrogen-bonded tautomeric dimer and trimer superstructures on the perovskite surface. This electron localization weakens adverse effects from Anderson localization and improves ordering in the crystal structure of TEA 2 SnI 4 . These factors result in a two-orders-of-magnitude reduction in the non-radiative recombination capture coefficient and an approximately twofold enhancement in the exciton binding energy. Our lead-free PeLED has an external quantum efficiency of up to 20.29%, representing a performance comparable to that of state-of-the-art lead-containing PeLEDs 6 , 7 , 8 , 9 , 10 , 11 , 12 . We anticipate that these findings will provide insights into the stabilization of Sn(II) perovskites and further the development of lead-free perovskite applications.
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危险品化学品经营许可证（带存储）