Nature Communications
·
2023
·Vol. 14
·期 1
·1-9
·
IF 16.6
Ni Chujun,Chen Di,Wen Xin,Jin Binjie,He Yi,Xie Tao,Zhao Qian
Stimuli-responsive shape-changing hydrogels are attractive candidates for use as underwater soft robots. The bottleneck lies in the low actuation speed inherently limited by the water diffusion between hydrogels and their surrounding environment. In addition, accessing complex motions is restricted by the material fabrication methods. Here we report a hitherto unknown mechanism to achieve high-speed and programmable actuations for a disulfide crosslinked thermally responsive hydrogel. The dynamic photo-activated disulfide bond exchange allows photo-mechanical programming to introduce spatio-selective network anisotropy. This gives rise to an actuation behavior dominated by thermally driven conformation change of the locally oriented polymer chains instead of the common mass-diffusion-based mechanism. With the incorporation of photothermal fillers, light-powered oscillation at frequencies as high as 1.7 Hz is realized. This, coupled with the versatility of the programming, allows access to robots with diverse high-speed motions including continuous swimming, step-wise walking, and rotating.
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Advanced Electronic Materials
·
2023
·Vol. 9
·期 12
·2300469
·
IF 6.2
Hao Dong,Wenxin Liu,Yi Li,Xing Chen,Di Wang
Metal oxide materials are widely adopted in UV sensing due to their advantages of reliability, stability, and high sensitivity. However, the fabrication of metal oxide films on flexible substrates using micro/nano printing techniques still poses challenges. Notably, inks containing oxide nanoparticles often lead to nozzle clogging during the printing process. In addition, methods relying on precursor solutions typically require high post-processing temperatures that conventional flexible substrates cannot withstand. In this study, a novel precursor ink based on zinc amine hydroxide complexes is proposed, enabling post-processing at a low temperature of 250 °C. Through a fully printed approach, a wearable UV sensor based on a zinc oxide nanofilm on a flexible substrate is successfully fabricated. The sensor exhibits outstanding sensitivity and rapid response characteristics. By incorporating silver nanoparticles into the ink, the baseline resistance of the sensitive material is adjusted. Furthermore, a smart patch utilizing the NFC communication protocol is developed, allowing for wireless, passive, and wearable UV detection. In this study, a process paradigm for fabricating metal oxide films on flexible substrates using micro/nano printing techniques is introduced, showcasing significant potential in the field of micro/nano sensor fabrication.
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JOURNAL OF ALLOYS AND COMPOUNDS
·
2023
·
IF 6.2
Ruizheng Xu,Guiyu Wei,Zhemin Xie,Sijie Diao,Jianfeng Wen,Tao Tang,Li Jiang,Ming Li,Guanghui Hu
Increasing the efficiency of charge transfer and separation efficiency of photogenerated carriers are still the main challenges in the field of semiconductor-based photocatalysts. Herein, we synthesized g-C 3 N 4 @V 2 C MXene photocatalyst by modifying g-C 3 N 4 using V 2 C MXene. The prepared photocatalyst exhibited outstanding photocatalytic performance under visible light. The degradation efficiency of methyl orange by g-C 3 N 4 @V 2 C MXene photocatalyst was as high as 94.5%, which is 1.56 times higher than that by g-C 3 N 4 . This was attributed to the V 2 C MXene inhibiting the rapid recombination of photogenerated carriers and facilitating rapid transfer of photogenerated electrons (e − ) from g-C 3 N 4 to MXene. Moreover, g-C 3 N 4 @V 2 C MXene photocatalyst showed good cycling stability. The photocatalytic performance was higher than 85% after three cycles. Experiments to capture free radicals revealed that superoxide radicals (·O 2 − ) are the main contributors to the photocatalytic activity. Thus, the proposed g-C 3 N 4 @V 2 C MXene photocatalyst is a promising visible-light catalyst.
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MOLECULES
·
2023
·Vol. 28
·期 19
·6949
·
IF 4.6
Heng Guo,Yangzhou Deng,Haoyong Yin,Juanjuan Liu,Shihui Zou
Fabricating heterostructures with abundant interfaces and delicate nanoarchitectures is an attractive approach for optimizing photocatalysts. Herein, we report the facile synthesis of BiOCl nanoflake/FeOCl nanospindle heterostructures through a solution chemistry method at room temperature. Characterizations, including XRD, SEM, TEM, EDS, and XPS, were employed to investigate the synthesized materials. The results demonstrate that the in situ reaction between the Bi precursors and the surface Cl−of FeOCl enabled the bounded nucleation and growth of BiOCl on the surface of FeOCl nanospindles. Stable interfacial structures were established between BiOCl nanoflakes and FeOCl nanospindles using Cl−as the bridge. Regulating the Bi-to-Fe ratios allowed for the optimization of the BiOCl/FeOCl interface, thereby facilitating the separation of photogenerated carriers and accelerating the photocatalytic degradation of RhB. The BiOCl/FeOCl heterostructures with an optimal composition of 15% BiOCl exhibited ~90 times higher visible-light photocatalytic activity than FeOCl. Based on an analysis of the band structures and reactive oxygen species, we propose an S-scheme mechanism to elucidate the significantly enhanced photocatalytic performance observed in the BiOCl/FeOCl heterostructures.
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Crystals
·
2023
·Vol. 13
·期 11
·1531
·
IF 2.7
Li Wang,Junbo Wang,Yanfei Fei,Heping Cheng,Hua Pan,Chunfeng Wu
Novel Ag3PO4/Bi2WO6catalysts with enhanced visible-light performance were synthesized using a hydrothermal method and characterized to investigate their morphology, microscopic structure, and binding energies. Photoluminescence spectrum (PL) and electrochemical impedance spectroscopy (EIS) data demonstrate that the formed Ag3PO4/Bi2WO6heterojunction effectively promotes hole (h+)–electron (e−) separation and transfer efficiency, resulting in the enhancement of photocatalytic activity. Ag3PO4/Bi2WO6displays higher photocatalytic activity than pure Bi2WO6or Ag3PO4alone. Photogenerated holes (h+), ·O2−, and ·OH were found to be the main active species for the degradation of malachite green (MG), methylene blue (MB), and Rhodamine B (RhB). The DFT calculation explains the photostability of Ag3PO4/Bi2WO6from the perspective of electronic structure. The bandgap of Ag3PO4/Bi2WO6between the highest occupied molecular orbital (HOMO) and the lowest unoccupied molecular orbital (LUMO) is 1.41 eV, compared with that of Ag3PO4at 0.91 eV and Bi2WO6at 2.59 eV. Ag–O–Bi hybridization and the wide HOMO–LUMO bandgap lead to difficulty in electron transfer. As a consequence, Ag+is difficult to obtain electrons and difficult to convert into Ag0, which makes the catalyst stable.Keywords:Ag3PO4;Bi2WO6;heterojunction;photocatalyst;visible-light-driven
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PROGRESS IN ORGANIC COATINGS
·
2023
·
IF 6.6
Yue Wu,Xiaotian Zhang,Mengyao He,Xue Tian,Neng Qian,Yangyi Sun,Dongming Qi
Microfiber-composed functional synthetic leather is of particular interest because it owns the advantages of good fluffiness, softness, excellent hygroscopicity , the random three-dimensional bundle structure similar to that of natural leather, which grants excellent moisture permeability, air permeability , chemical resistance, waterproof and mildew resistance, and various functions. Typically, the microfiber of functional synthetic leather is obtained through splitting the original sea-island fiber by solvent-induced dissolution and etching of its sea phase, which inevitably leads to the decline of the wettability of the treated leather. Herein, light-triggered functional microcapsules for self-healing wettability of split microfibers have been judiciously designed and developed. These functional microcapsules loaded with fluoroalkyl silane , which are used to coat onto the original sea-island fiber, allow for photocontrol of releasing the superhydrophobic chemical to the coated fibers. Despite the superhydrophobicity of the split fiber would be weakened by the splitting operation, the light-triggered release of fluoroalkyl silane can effectively amend its superhydrophobic properties. The microfiber leather self-repaired by the functional microcapsules exhibits good superhydrophobic performance, excellent self-cleaning ability to dust and RhB solution, high friction resistance (up to 200 rubs), and good UV light self-repairing cycle performance. This study provides a versatile solution for efficiently self-repairing microfiber leathers after the splitting process.
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RSC Advances
·
2021
·Vol. 11
·期 14
·7954-7960
·
IF 3.361
Jianxin Chen,Peng Miao,E. Emily Lin,Ting Bai,Stoyan K. Smoukov,Jie Kong
Microwave absorbents with specific morphology and structure have fundamental significance for tuning microwave absorption (MA). Herein, N-doped carbon sphere nanoparticles and hollow capsules were successfully fabricated via oxidative polymerization of dopamine in different mixed solutions, without any template preparation or etching process. Compared to solid particles, the microwave absorbents consisting of N-doped carbon with a hollow structure showed enormously enhanced MA performance, exhibiting a broad effective absorption bandwidth (from 12.7 GHz to 17.9 GHz) and a minimum reflection loss of −27.2 dB with a sample thickness of 2.0 mm. This work paves an attractive way for simple and eco-friendly preparation of advanced light weight microwave absorbents.
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EcoMat
·
2021
·Vol. 3
·期 6
·e12144
·
IF 0
Mengmeng Zhang,Huiying Wang,Zaiyan Hou,Qiang Chen,Zhanjun Xie,Jintao Zhu,Jiangping Xu,Lianbin Zhang
The search and the utilization of alternative water resources to produce freshwater are highly important to the water shortage, especially in arid and desert regions. In these areas, the surface soil moisture (SSM) can be a promising water source, whereas its extraction and following release remain challenging. In this study, a light-responsive bilayered hydrogel (LRBH) is designed to produce freshwater from SSM, which is obtained by the copolymerization of N -isopropylacrylamide (NIPAM) and acrylic acid (AA) and in-situ surface polymerization of polypyrrole (PPy). By careful optimization of the ratio of NIPAM and AA, the water absorption capacity of LRBH is significantly improved with the water absorption of 4.4 g/g even in the sandy soil with an extremely low water content (~3 wt%). The PPy in the top layer of the LRBH can absorb solar light to heat the hydrogel at daytime so that the temperature of the hydrogel can quickly rise above the lower critical solution temperature of LRBH. As a result, the freshwater is quickly expelled from the LRBH. Under simulated solar light irradiation, 68.6% of all absorbed water within LRBH can be released within 20 min. The current study provides an effective and facile strategy for SSM capture and suitable systems for the generation of freshwater in arid or desert regions.
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Polymer Chemistry
·
2021
·Vol. 12
·期 24
·3582-3591
·
IF 5.582
Liulong Guo,Hongxia Yan,Lirong Yan,Lihua Bai,Song Niu,Yan Zhao
Hyperbranched polysiloxanes (HBPSi) have received widespread attention as emerging non-traditional fluorescent polymers. However, they have some drawbacks such as inadequate emission intensity and poor water solubility, which limit their further application in medicine and optoelectronic devices. In this study, a kind of novel HBPSi containing carbon dots (HBPSi-CDs) was prepared by a facile “one step” hydrothermal treatment method. Surprisingly, the synthesized HBPSi-CDs could emit near white light with the CIE coordinates of (0.301, 0.333) via mixing dual emission at 414 and 532 nm when the excitation wavelength was 340 nm. The experimental results show that the 414 nm emission originates from the HBPSi skeleton structure, and the 532 nm emission comes from the carbon dot structure excited with 414 nm light. In addition, HBPSi-CDs shows good water solubility and highly selective quenching to Fe3+ ions. Therefore, HBPSi-CDs shows promising applications in white organic light-emitting diodes (OLEDs) and fluorescent probes.
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FUEL
·
2021
·
IF 6.609
Wenchao Wang,Fashe Li,Hua Wang
The oxidative stability of Jatropha biodiesel after exposure to different wavelengths of visible light was studied and kinetic analysis of the oxidation process was carried out. The results showed that the induction period of Jatropha biodiesel was 5.12 h and visible light at different wavelengths affected the oxidation of biodiesel differently. Effect of oxidation was the strongest in the purple, where the induction period was reduced to 2.65 h. The red had the weakest effect on biodiesel oxidation, and the induction period was reduced to 4.61 h. Acid value detection, component analysis and UV characterization of biodiesel oxidized by visible light at different wavelengths. The results showed that with the decrease of light wavelength, the acid value of the biodiesel increased from 0.2577 mg KOH/g to 0.3438 mg KOH/g and the content of methyl linoleate containing two carbon–carbon double bonds decreases. UV characterization results showed that the absorption peak absorbance of conjugated double bond of Jatropha biodiesel oxidized by purple light was 5.282, while the absorption peak absorbance of conjugated double bond of Jatropha biodiesel oxidized by red light was only 2.877, and purple light was helpful to stimulate the generation of conjugate double bond. The kinetic analysis results showed that the different wavelengths had different rates of biodiesel degradation. Purple light has the fastest oxidation rate. The oxidation rate constant k 1 was 0.06011, the reaction order was n = 1, and the minimum activation energy of the oxidation reaction process was 19.79 kJ·mol −1 .
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JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2021
·
IF 8.128
Haipeng Wu,Junchen Luo,Xuewu Huang,Ling Wang,Zheng Guo,Jiayi Liang,Shu Zhang,Huaiguo Xue,Jiefeng Gao
Although some groundbreaking work has proved the feasibility of non-contact Marangoni propulsion generated by combination of the superhydrophobicity and photothermal effect, there are still challenges including the strong interfacial adhesion, multifunctional structural design and superior durability. In this paper, a simple two-step spraying method is used to prepare superhydrophobic and multi-functional fluorinated acidified carbon nanotubes (F-ACNTs)/Fe 3 O 4 nanoparticles/polydimethylsiloxane (PDMS) coatings. The introduction of Fe 3 O 4 nanoparticles and F-ACNTs not merely improve the surface roughness but also endow the coating with the outstanding magnetic property and photothermal conversion performance. The PDMS can reduce the surface energy and also improve the interfacial adhesion between the nanofillers and the substrate (the filter paper). The superhydrophobicity can be maintained when the material experiences abrasion, near-infrared (NIR) light irradiation and acid treatment, exhibiting outstanding durability. The highly stable superhydrophobic coating introduces a thin layer of air to decrease the drag force between the filter paper and the water surface, and can be used for controlled self-propelled light-driven motion and magnetic-driven motion. The movement can be manipulated by adjusting the direction of the incident NIR light and magnetic field. In particular, the superhydrophobic and superoleophilic coating based actuators can be easily driven to the oil-contaminated area on the water surface by using a magnet for high efficiency oil removal. This work provides a simple and universal strategy for developing intelligent and multi-responsive actuators possessing promising applications in various fields such as environmental protection, micro-robots and biomedicine.
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ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Xiaoyun Li,Rui Wu,Huan Chen,Ting Li,Huiming Jiang,Xingquan Xu,Xueting Tang,Mimi Wan,Chun Mao,Dongquan Shi
One of the difficulties in atherosclerosis treatment is that the ablation of inflammatory macrophages, repair of vascular endothelial injury, and anti-tissue proliferation should be considered. However, there are few studies that can solve the abovementioned problems simultaneously. Herein, we present a kind of near-infrared (NIR) light-driven multifunctional mesoporous/macroporous tubular micromotor which can rapidly target the damaged blood vessels and release different drugs. Their motion effect can promote themselves to penetrate into the plaque site, and the generated heat effect caused by NIR irradiation can realize the photothermal ablation of inflammatory macrophages. Furthermore, these micromotors can rapidly release the vascular endothelial growth factor for endothelialization and slowly release paclitaxel for antiproliferation to achieve synergistic treatment of atherosclerosis. In vivo results demonstrated that the micromotors can achieve a good therapeutic effect for atherosclerosis. This kind of micro/nanomotor technology with a complex porous structure for drug loading will bring a more potential treatment platform for the disease.
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