Journal of Environmental Chemical Engineering
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2023
·
IF 7.7
Xin Fang,Chu-Ya Wang,Long-peng Zhou,Qi Zeng,Heng-Deng Zhou,Qi Wang,Guangcan Zhu
Photocatalytic reduction of CO 2 into valuable resources presents an efficient solution to mitigate the energy crisis and effects of climate change . However, the low efficiency of photocatalytic CO 2 reduction of photocatalysts under visible light irradiation limits their industrial applications. Bismuth oxybromide (BiOBr) is a typical visible-light-driven photocatalyst with an appropriate band gap, but the charge separation efficiency still needs to be improved. In this work, the Au-doped BiOBr nanosheets with enhanced electrochemical characteristics were successfully synthesized through a simple one-step hydrothermal procedure. After Au-doping modification, the charge separation efficiency of BOB-Au-I sample were measured as 2.5 times than that of BiOBr nanosheets. And the BOB-Au-I samples exhibited an outstanding photocatalytic capacity for converting CO 2 to CO with a yield rate of approximately four times higher than that of BOB nanosheets under visible light irradiation. Furthermore, the mechanism of CO 2 reduction was elucidated through in situ Fourier-transform infrared spectroscopy. This study provides a facile method for achieving Au-doping modification of BiOBr nanosheets for efficient reduction of CO 2 .
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高影响因子
LANGMUIR
·
2023
·
IF 3.9
Yacong Hou,Ding Weng,Zheng Zhang,Yadong Yu,Lei Chen,Jiadao Wang
Intelligent surfaces with reversibly switchable wettability have recently drawn considerable attention. One typical strategy to obtain such a surface is to change the surface chemistry or the microstructure. Herein, we report a new smart surface for which the wettability was controlled by both the surface chemistry and microstructure. Various wetting states were reversibly and precisely controlled through heating, pressing, NIR irradiation, and oxygen plasma treatment. The excellent shape memory characteristics of shape memory polyurethane (SMPU) and the controlled release of hydrophobic/hydrophilic oxygen-containing functional groups contributed to this ability. Microcapsules were used to design these smart surfaces. They controlled the release of a fluorinated alkyl silane (FAS) through shell melting, changed the surface composition, and played a decisive role in protecting the FAS against hydrolysis and evaporation to ensure that the surface’s wettability is recyclable. Controlling of the surface chemistry or microstructure was repeated for at least 19 or 16 cycles, respectively, which indicated excellent repeatability compared to other smart surfaces. Based on the excellent controllability, the surface exhibited multiple functions, such as liquid directional transport and coefficient of friction control. In addition, it maintained this extraordinary ability under harsh environments owing to the great stability of the SMPU and adequate protection of the FAS by the microcapsules. With switchable wettability based on the surface chemistry and microstructure, this work provides a new principle for designing smart surfaces with wettability controlled in two ways.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2023
·
IF 8.2
Yinan Li,Jun Wang,Jiajia Guo,Chenglong Fu,Liulian Huang,Lihui Chen,Yonghao Ni,Qinghong Zheng
Actuators are widely used in bionic devices and soft robots, among which invisible actuators have some unique applications, including performing secret missions. In this paper, highly visible transparent cellulose-based UV-absorbing films were prepared by dissolving cellulose raw materials using N -methylmorpholine-N-oxide (NMMO) and using ZnO nanoparticles as UV absorbers. Furthermore, transparent actuator was fabricated by growing highly transparent and hydrophobic polytetrafluoroethylene (PTFE) film on regenerated cellulose (RC)-ZnO composite film. In addition to its sensitive response to Infrared (IR) light, the as-prepared actuator also shows a highly sensitive response to UV light, which is attributed to the strong absorption of UV light by ZnO NPs. Thanks to the drastic differences in adsorption capacity between the RC-ZnO and PTFE materials for water molecules, the asymmetrically- assembled actuator demonstrates extremely high sensitivity and excellent actuation performance, with a force density of 60.5, a maximum bending curvature of 3.0 cm −1 , and a response time of below 8 s. Bionic bug, smart door and the arm of excavator made from the actuator all exhibit sensitive responses to UV and IR lights.
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Journal of the Mechanical Behavior of Biomedical Materials
·
2023
·
IF 3.9
Rongfang Zou,Lunan Bi,Yang Huang,Yadi Wang,Yan Wang,Lin Li,Jiayin Liu,Lu Feng,Xiaoxia Jiang,Bin Deng
For decades, titanium has been the preferred material for dental implant fabrication. However, metallic ions and particles can cause hypersensitivity and aseptic loosening. The growing demand for metal-free dental restorations has also promoted the development of ceramic-based dental implants, such as silicon nitride . In this study, silicon nitride (Si 3 N 4 ) dental implants were fabricated for biological engineering by photosensitive resin based digital light processing (DLP) technology, comparable to conventionally produced Si 3 N 4 ceramics. The flexural strength was (770 ± 35) MPa by the three-point bending method, and the fracture toughness was (13.3 ± 1.1) MPa · m 1/2 by the unilateral pre-cracked beam method. The elastic modulus measured by the bending method was (236 ± 10) GPa. To confirm whether the prepared Si 3 N 4 ceramics possessed good biocompatibility , in vitro biological experiments were performed with the fibroblast cell line L-929, and preferable cell proliferation and apoptosis were observed at the initial stages. Hemolysis test, oral mucous membrane irritation test, and acute systemic toxicity test (oral route) further confirmed that the Si 3 N 4 ceramics did not exhibit hemolysis reaction, oral mucosal stimulation, or systemic toxicity. The findings indicate that Si 3 N 4 dental implant restorations with personalized structures prepared by DLP technology have good mechanical properties and biocompatibility, which has great application potential in the future.
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CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Kailun Wei,Kefei Zhao,Yuxia Gao,Hao Zhang,Xia Yu,Min-Hui Li,Jun Hu
Functional carriers are appealing materials for pesticide formulations due to their superior role in improving pesticide utilization and reducing environmental pollution. Nevertheless, current carriers often involve tedious chemical synthesis and are time-consuming, which rise potential risks to environment and limit the large-scale industrialization. Here, taking advantage of inverse vulcanization reaction, a near-infrared responsive polysulfide carrier (SOCT) loading tebuconazole (Teb) is prepared in one-pot by using industrial waste sulfur (S 8 ), bio-based soybean oil (SO), and agricultural waste biochar as raw materials. The facile solvent- and surfactant-free processing and the low-cost of raw materials make SOCT be produced easily in kilogram-scale with a loading content of 34.1 wt%. The resulting SOCT exhibits good photothermal property upon irradiation of NIR light, and its release behavior is stable enough against different pH values and coexisting ions, implementing the controlled release of Teb. In vitro and in vivo experiments indicate that SOCT has excellent fungicidal activities against three pathogenic fungi and high biosafety for wheat seed germination and adult zebrafish. In addition, the carrier material is able to be degraded completely in the presence of alkaline or dithiothreitol molecules, due to the available dynamic ester and S-S bonds in polysulfides. These unique features endow our carriers with promising potentials in practical agro-productions. To the best of our knowledge, this is the first time to use inverse vulcanization to prepare carrier materials for pesticides, which provides an effective approach for pesticide formulations with multi-functionality and sustainability.
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Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 14
·4570-4575
·
IF 6.4
Mingxia Liu,Mingyang Fan,Shu Zhu,Weiping Liu,Lili Yang,Dengteng Ge
In nature, many mysterious creatures are capable of defense and courtship via mimicry or color change. However, developing smart materials with the integration of conformation and color/transparency changes is an intriguing but challenging task. Herein, we report a versatile membrane with integrated visible transparency and shape manipulation. This membrane consists of thermo-irritated shape memory polymers and doped nonclose-packing nanoparticles (NPs). A reversible transparency change with shape deformation (from 63.7% to 2.1%) is exhibited due to the light scattering from internal cavitation between the NPs and polymers. Meanwhile, the shape of the film can be programmed and reversibly actuated via thermal-control bidirectional actuation from the semi-crystalline structure of poly(ethylene-co-vinyl)acetate (EVA). The complex film also shows excellent stability of light and shape modulation after the first cycle. The programmable reconfiguration and transparency-changing of this smart film highlight its great potential in temperature recording, light/thermal management, anti-counterfeiting and camouflage.
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MOLECULES
·
2023
·Vol. 28
·期 7
·2957
·
IF 4.6
Zhenzhen Liu,Xiaofei Lu,Menglin Liu,Wenjing Wang
In this work, multicolor fluorescent carbon dots with red (R-CDs), yellow (Y-CDs), and blue (B-CDs) emissions were prepared by choosing proper aromatic precursors with different amounts of benzene rings through a simple solvothermal method. The characterization showed that the prepared carbon dots were spherical with a size under 10 nm, rich surface functional groups, and good stability. The emission wavelengths were located at 440, 530, and 580 nm under the excitation of 370 nm. The relative fluorescence quantum yield (QY) of R-CDs, Y-CDs, and B-CDs was 11%, 59%, and 33%, respectively. The related characterization demonstrated that the redshift in the photoluminescence was caused by the synergistic effect of the increasing graphitic nitrogen content, quantum size effect and surface oxidation state. By mixing the three prepared CDs into a PVA matrix, the transparent and flexible films produced relucent blue, yellow, and red emissions under 365 nm UV light, and solid-state quenching was effectively avoided. LEDs were fabricated by using B-CDs, Y-CDs, and R-CDs/PVA with a semiconductor chip. These CDs-based LEDs produced bright blue, yellow, and red light with CIE color coordinates of (0.16, 0.02), (0.38, 0.58), and (0.50, 0.49) were successfully manufactured utilizing the prepared blue, yellow and red multicolor carbon dots as the solid luminescent materials. The results showed that the synthesized CDs can be potentially applied in multi-color monitors as a promising candidate for light-emitting diodes (LEDs). This work blazes a novel trail for the controllable preparation of multicolor fluorescent carbon dots.
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Nature Communications
·
2023
·Vol. 14
·期 1
·1-11
·
IF 16.6
Chen Huai,Xiong Yangyang,Li Jun,Abed Jehad,Wang Da,Pedrazo-Tardajos Adrián,Cao Yueping,Zhang Yiting,Wang Ying,Shakouri Mohsen,Xiao Qunfeng,Hu Yongfeng,Bals Sara,Sargent Edward H.,Su Cheng-Yong,Yang Zhenyu
Improving the dispersion of active sites simultaneous with the efficient harvest of photons is a key priority for photocatalysis. Crystalline silicon is abundant on Earth and has a suitable bandgap. However, silicon-based photocatalysts combined with metal elements has proved challenging due to silicon’s rigid crystal structure and high formation energy. Here we report a solid-state chemistry that produces crystalline silicon with well-dispersed Co atoms. Isolated Co sites in silicon are obtained through the in-situ formation of CoSi 2 intermediate nanodomains that function as seeds, leading to the production of Co-incorporating silicon nanocrystals at the CoSi 2 /Si epitaxial interface. As a result, cobalt-on-silicon single-atom catalysts achieve an external quantum efficiency of 10% for CO 2 -to-syngas conversion, with CO and H 2 yields of 4.7 mol g (Co) −1 and 4.4 mol g (Co) −1 , respectively. Moreover, the H 2 /CO ratio is tunable between 0.8 and 2. This photocatalyst also achieves a corresponding turnover number of 2 × 10 4 for visible-light-driven CO 2 reduction over 6 h, which is over ten times higher than previously reported single-atom photocatalysts.
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高影响因子
Catalysts
·
2023
·Vol. 13
·期 4
·659
·
IF 3.9
Yuxin Wang,Yinxiu Jin,Minghan Jia,Hu Ruan,Xuefen Tao,Xuefeng Liu,Guang Lu,Xiaodong Zhang
CeVO4-V2O3composites were prepared by simple hydrothermal method, and the effects of ethylene glycol(EG) on the products were studied by XRD, N2adsorption–desorption, SEM, EDS, XPS, PL and UV-vis spectra. The characterization reveals a slight decrease in surface area and a slight enhancement of visible light absorption in the final sample, while the crystalline phase, morphology and separation efficiency of the collective carriers are severely affected by the EG. At the same time, the photocatalytic effect of CeVO4-V2O3composites was evaluated by the degradation rate of methylene blue (MB) under simulated visible light. The sample for 10 mL EG obtained the highest efficiency of 96.9%, while the one for 15 mL EG showed the lowest efficiency of 67.5% within 300 min. The trapping experiments and ESR experiment showed that the contribution of active species to the photocatalytic degradation of MB was ∙OH > h+> ∙O2−in descending order, and a possible degradation mechanism was proposed.Keywords:ethylene glycol;CeVO4-V2O3;methylene blue oxidation;visible light
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Laser & Photonics Reviews
·
2023
·Vol. 17
·期 3
·2200861
·
IF 11
Longxue Cao,Yang Shen,Bing Lei,Wei Zhou,Shuhong Li,Yunlong Liu,Yu Lu,Kai Zhang,Hao Ren,Yan-Qing Li,Jian-Xin Tang,Wenjun Wang
Reduced-dimensional perovskite light-emitting diodes (PeLEDs) have shown great potential in solution-processed high-definition displays. However, the inferior electroluminescent (EL) performance of blue PeLEDs has become a huge challenge for their commercialization. The inefficient domain control [number of PbX 6 − layers ( n )] and deleterious phase segregation make the blue PeLEDs suffer from low EL efficiency and poor spectral stability. Here, a rational strategy for perovskite crystallization control by adjusting the precursor concentration is proposed for improving phase distribution and suppressing ion migration in reduced-dimensional mixed-halide blue perovskite films. Based on this method, efficient sky-blue PeLEDs exhibit a maximum external quantum efficiency (EQE) of 8.5% with stable EL spectra at 482 nm. Additionally, spectrally stable pure-blue PeLEDs at 474 and 468 nm are further obtained with maximum EQEs of 4.0% and 2.4%, respectively. These findings may provide an alternative scheme for manipulating perovskite crystallization dynamics toward efficient and stable PeLEDs.
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Processes
·
2022
·Vol. 11
·期 1
·115
·
IF 3.352
Ting Gao,Jingqi Lin,Ke Zhang,Mohsen Padervand,Yifan Zhang,Wei Zhang,Menglin Shi,Chuanyi Wang
Since conventional techniques are ineffective for NO removal at low concentrations, photocatalysis has become attractive in this regard, recently. However, in practice, photocatalytic NO removal has drawbacks such as limited light absorption and the proclivity of producing toxic by-products. To address these issues, novel defective Bi/Bi3NbO7structures with good porosity were fabricated by a solvothermal method and used for enhanced photocatalytic NO removal under visible light irradiation. The morphological and structural properties of the prepared materials were comprehensively analyzed. The optimal photocatalytic activity of pore-defective Bi/Bi3NbO7for NO removal was 60.3%, when the molar ratios of urea and Bi(NO)3•5H2O to pristine Bi3NbO7were 1:25 and 1:2, respectively, under the following operational conditions: NO concentration of 700 ppb, catalyst dosage of 50 mg and irradiation time of 14 min. The induced defects and the surface plasmon resonance (SPR) effect of Bi nanodots made remarkable contributions to improving the photocatalytic NO removal as well as inhibiting the toxic byproduct NO2. The photocatalytic NO removal pathway over the prepared photocatalysts was further mechanistically clarified taking advantage of EPR results and scavenging experiments. Considering the increased NO generation in the atmosphere, this work may provide novel insights for designing effective porous photocatalysts to treat gaseous toxic pollutants.Keywords:photocatalysis;Bi3NbO7;surface plasmon resonance;NO removal;defects
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Theranostics
·
2019
·
IF 8.063
Jiaxin Wang,Chenjie Yao,Bin Shen,Xiaohui Zhu,Yong Li,Liyi Shi,Yong Zhang,Jinliang Liu,Yanli Wang,Lining Sun
Nanoparticle-based theranostics combines tumor imaging and cancer therapy in one platform, but the synthesis of theranostic agents is impeded by chemical groups on the surface and the size and morphology of the components. Strategies to construct a multifunctional platform for bioimaging and photothermal therapy (PTT) are urgently needed. A new upconversion-magnetic agent (FeCUPs) based on hollow carbon spheres, which is both a photothermal agent and a dual carrier of luminescent and magnetic nanoparticles, provides an effective approach for tumor elimination. Methods: The morphology of FeCUPs was characterized for the construction and size adjustment of the theranostic agent using transmission electron microscopy, high-resolution transmission electron microscopy, energy dispersive spectroscopy and high angle annular dark field scanning transmission electron microscopy. The distribution of FeCUPs was tracked under in-situ upconversion luminescence (UCL) imaging and magnetic resonance imaging (MRI) in vivo . Photothermal therapy was carried out on tumor-bearing mice, after which the toxicity of PTT was evaluated by a blood biochemistry test and histological section analysis. Results: Stable and uniform loading of luminescent nanocomposites on three-dimensional carbon materials is reported for the first time. Based on the mechanism of synthesis, the size of the hybrid particles was adjusted from micrometers to nanometers. External magnetic field-enhanced photothermal therapy with multi-model imaging was accomplished using FeCUPs. Moreover, no cancer recurrence was found during 14 days of recovery without PTT. Conclusions: Hollow carbon spheres, photothermal agents loaded with upconversion nanoparticles inside and magnetic nanoparticles outside were prepared for photothermal therapy. The aggregation of FeCUPs in tumors by the local magnetic field was verified by MRI and UCL imaging, and PTT was enhanced.
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