JOURNAL OF MATERIALS SCIENCE
·
2017
·Vol. 53
·期 5
·3889-3898
·
IF 2.599
Li Yingying,Hui Bin,Lv Miao,Li Jian,Li Guoliang
The inorganic–organic hybrid photoresponsive wood was fabricated by incorporating the phosphomolybdic acid (PMA)/polyvinylpyrrolidone (PVP) composites into the multi-scale hierarchical structure of wood using a simple pressure impregnation method. The as-prepared PMA-/PVP-coated wood (PPW) can change their colors in response to visible light. Scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy demonstrated that the PMA/PVP composites were coated on the wood surfaces successfully and the wood structures were still clearly visible. The atomic force microscopy images confirmed that the surface topography of the samples was changed after visible light irradiation, which was ascribed to the formation of heteropoly blues. The analysis of the color parameters proved that as-prepared PPW possessed the excellent photoresponsive property. The ultraviolet–visible spectra (UV–Vis) and X-ray photoelectron spectroscopy were conducted in order to explore the photoresponsive mechanism, which confirmed the photoreduction reaction occurred, producing the heteropoly blues during the process of visible light irradiation.
研究领域:
材料科学
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光学
·
林业工程
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DOI
高影响因子
Applied Materials Today
·
2021
·
IF 10.041
Xiao Chen,Xiaoyong Ding,Yilin Liu,Jing Li,Wenjuan Liu,Xiaolong Lu,Zhongwei Gu
Micro/nanomotors have attracted extensive attentions in aquatic environmental remediation, but the random motion and uncontrollability restricts the precise location and timely adjustment in micro-environmental remediation, such as in microchannels and microwells. Herein, we demonstrated visible-light-driven cadmium sulfide quantum dots doped cuprous oxide (Cu 2 [email protected] ) micromotors adsorbent with excellent removability to cationic dye, in along with effective motion regulation. The Cu 2 [email protected] micromotors adsorbent with type II heterostructure was fabricated by simple in-situ deposition and exhibited outstanding motion controllability and instant response under visible light illumination. The existence of a staggered gap between Cu 2 O and CdSe formed a heterojunction, effectively inhibiting recombination of photogenerated electron-hole pairs and improving photocatalytic activity of Cu 2 [email protected] micromotors. Negative phototactic self-propulsion with maximum speed to ∼42.3 μm/s was achieved in biological environments because of the formation of the asymmetric chemical concentration gradient around the motors. Additionally, by modulating the direction and on/off state of asymmetric light field, it is capable of steering motor moving with multiple controllable modes, such as horizontal, vertical, stop/go and patterned propulsion, which will facilitate the on-demand orientation once in the complex microchannel. Furthermore, the capability of Cu 2 [email protected] micromotors adsorbent is confirmed with a rapid adsorption rate of 96% on methyl blue after 10 min. Additionally, the stability of micromotors is evaluated. Although with inevitable oxidation or photocorrosion for all Cu 2 O micromotor, the strong adsorption ability is promised with 5 times recycling in low concentration of dye solution. Such attractive micromachines with boosted motility and lower production cost hold a considerable promise for a complex environmental remediation.
研究领域:
环境科学
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纳米技术
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材料科学
·
化学工程
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DOI
高影响因子
ANALYTICAL CHEMISTRY
·
2021
·
IF 6.986
Yufeng Liu,Xiaoyu Wang,Quan Wang,Yihong Zhang,Quanyi Liu,Shujie Liu,Sirong Li,Yan Du,Hui Wei
Mimicking enzyme specificity via construction of on-demand geometric structures on nanozymes is of great interest in recent years. Although building substrate-specific polymers on nanozymes has achieved great success, polymer-blocked active sites would inevitably lead to decreased activity of nanozymes. Here, we have developed three photoactive metal–organic framework (MOF)-based nanozymes (called 2D-TCPP, 3D-TCPP, and AD-TCPP), which have different geometric structures as well as unshielded active sites. Together with their structural variations and excellent photoresponsive oxidase-like activities, these photoactive nanozymes exhibit structure-dependent specificity for three kinds of substrates (typical oxidase substrates, organic pollutants, and antioxidants). Moreover, AD-TCPP and 3D-TCPP show potential applications for environmental protection and bioanalysis, respectively. This work offers a promising approach to the development of nanozymes with enzyme-like specificity.
研究领域:
纳米技术
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材料科学
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生物化学
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环境科学
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产品关联
DOI
PubMed
高影响因子
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
·
2019
·
IF 4.081
Keqiang Zhang,Rujie He,Guojiao Ding,Chengwei Feng,Weidong Song,Daining Fang
3Y-TZP strengthened ZrO 2 ceramics were fabricated by using digital light processing (DLP) based additive manufacturing . The effects of 3Y-TZP concentration on the relative density, linear shrinkage, microstructure, and mechanical properties of the DLP-prepared ZrO 2 ceramic were investigated in detailed. High precision ZrO 2 ceramic parts with lattice structure with parts were successfully prepared by using DLP. The highest relative density and flexural strength were 96.40% and 306.53 ± 6.03 MPa, respectively, when the 3Y-TZP concentration was 7.5 vol%. The strengthening mechanism was discussed in detailed.
研究领域:
材料科学
·
机械工程
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产品关联
DOI
高影响因子
Materials Today Physics
·
2020
·
IF 10.443
T. Zhang,H. Yu,J. Li,H. Song,S. Wang,Z. Zhang,S. Chen
Water pollution by pathogenic bacteria is a major threat to human health, and less-than-ideal disinfection and antimicrobial strategies have been developed to address waterborne pathogens. A green light–triggered photocatalytic antimicrobial rose bengal (RB)–modified cotton fabric (CF) (RB-CF) was prepared for wastewater disinfection by covalently binding RB to a CF surface. The antimicrobial rates of RB-CF against gram-positive Staphylococcus aureus and gram-negative Escherichia coli were both greater than 99.99% due to the generation of singlet oxygen that inactivates microbes under green light irradiation. Most importantly, RB-CF exhibited high stability, negligible cytotoxicity, and no release of free RB during the photocatalytic process, which was the key to its long-term antimicrobial activity and use security. Its long-term antimicrobial activity was further verified by the repeated photocatalytic disinfection; more than 99.99% of bacteria were inactivated even after five cycles. Therefore, this work may offer a potential avenue to develop low-cost, non-toxic, and durable antimicrobial fabrics with great potential for industrial and health-care applications, including but not limited to water purification , wastewater disinfection, masks, and protective clothing.
研究领域:
环境科学
·
微生物学
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材料科学
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DOI
高影响因子
Coatings
·
2022
·Vol. 12
·期 5
·608
·
IF 3.236
Bowen Wang,Juanjuan Wang,Xue Han,Conghua Lu
Here we report a simple micro/nano patterning strategy based on light-induced surface wrinkling. Namely, we fabricated a film/substrate system composed of polydimethylsiloxane (PDMS) as a soft substrate and non-photosensitive polymer polystyrene (PS) mixed with azo-polymer (polydisperse orange 3, PDO3) as a stiff film. Taking advantage of the photo-thermal effect and photo-softening effect of PDO3, we fabricated various microstructured wrinkling morphologies by a simple light illumination. We investigated the influence of two exposure modes (i.e., static selective exposure and dynamic moving exposure), the illumination conditions, the composition of the blended film, and the film thickness on the resulting wrinkling patterns. It is highly expected that this azo-based photosensitive wrinkling system will be extended to functional systems for the realization of light-induced surface micro/nanopatterning.Keywords:azopolymer;polystyrene;surface wrinkling;photoresponses;polydimethylsiloxane
研究领域:
材料科学
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光学工程
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2022
·
IF 6.371
Yanping Liu,Yan Zhan,Beata Szreniawa,Katarzyna Matras-Postolek,Ping Yang
Perovskite nanomaterials with highly stable and bright emission were requested for white light emitting diodes (LEDs). In this paper, superior thin CsPbBr 3 nanoplates (NPLs) with an average thickness of 1.9 nm were synthesized via solvothermal reactions. A bright blue-emitting peak at 455 nm with a photoluminescence (PL) quantum yield of 89 % was observed. The high PL efficiency was kept after storing for 90 days at ambient condition. This supplied an efficient approach to solve the problem of low PL efficiency and poor stability of blue-emitting perovskite nanocrystals . The thickness of CsPbBr 3 NPLs was adjusted by changing preparation conditions. The PL peak wavelength of CsPbBr 3 NPLs was adjusted in a region of 455–465 nm. Through dynamic anion exchange promoted cation exchange reactions, Mn ions were introduced in the lattice of CsPbBr 3 NPLs to generate bright orange emitting to create dual-luminescent CsPbBr 3 :Mn NPLs. A white emitting sample with a color coordinate of (0.304, 0.325) was finally fabricated using bright CsPbBr 3 :Mn NPLs and green-emitting CsPbBr 3 nanocrystals. This work broadened the application of perovskite for display and lighting.
研究领域:
材料科学
·
光电技术
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纳米技术
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光子学
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产品关联
DOI
高影响因子
Advanced Optical Materials
·
2022
·Vol. 11
·期 4
·2202058
·
IF 10.05
Chaomin Mao,Songman Ju,Jinping Zheng,Yueting Zheng,Zhongwei Xu,Lihua Lin,Hailong Hu,Kaiyu Yang,Tailiang Guo,Fushan Li
Perovskite quantum dots (PQDs) have been widely used to realize light-emitting diodes (LEDs) with high color purity, efficiency, and wide color gamut. Due to the demand for huge amount of display information, development on high-resolution PQD LEDs (PQLEDs) with massive pixel density are highly desired. Herein, high-resolution PQLEDs are fabricated by using nanoimprint technique. By preparing a honeycomb-insulating polymer polymethyl methacrylate (PMMA) film, the high-resolution pixelated quantum dot emissive layer is formed. In addition, the leakage current of the device is significantly reduced because the direct contact between electron transport layer and hole transport layer is avoided. The PQLEDs based on nanoimprint technology show a resolution of 9072 pixels per inch (PPI), and a maximum external quantum efficiency (EQE) and brightness of 7.81% and 146 400 cd m −2 , respectively. The results demonstrate that high-resolution PQLEDs can be realized by using nanoimprint technology, holding great commercial potential for next-generation near-eye displays.
研究领域:
材料科学
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显示技术
·
纳米技术
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产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2022
·Vol. 33
·期 11
·2212523
·
IF 19.924
Yalun Xu,Ruiming Li,Songxue Bai,Yanyan Li,Zhenglin Jia,Yujie Yang,Enkang Cui,Fang Yao,Du Wang,Cheng Lei,Qianqian Lin
Chalcogenide-based semiconductors have recently emerged as promising candidates for optoelectronic applications, mainly benefiting from their facile and low-cost processability, chemical versatility, and tunable optoelectronic properties. Despite the recent success of chalcogenide-based thin-film photovoltaics, they have been barely leveraged in photodetection, mainly due to the complicated charge transport related to the trap states. In addition, most of the chalcogenide photodetectors are reported for broadband, visible photodetection, which is facile but lacks of impact for real applications. However, it is also possible to modulate the charge carrier dynamics of chalcogenide-based materials, and devise novel devices, which can possess extra compelling features. These possibilities provide strong incentives for a detailed study on the chalcogenides-based narrowband photodetectors, which are achieved by a filterless, charge collection narrowing strategy. The optimized narrowband photodetectors also exhibit extremely fast-response (≈240 ns), relatively low dark current and noise, large linear dynamic range, and most importantly tunable spectral discrimination covering the whole range from UV to NIR. These devices also demonstrate great potential for imaging and communication.
研究领域:
材料科学
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光电子学
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光子学
·
半导体物理
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产品关联
DOI
高影响因子
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2022
·Vol. 30
·期 11
·30197-30209
·
IF 5.19
Feng Shan,Xie Taiping,Kong Deshun,Yang Fuling,Li Tao,Yang Junwei,Liu Meixin,Du Haigang,Su Zhimin
Many previous studies have underestimated the role of magnetic components in improving photocatalytic performance. It is significance to explore the migration mechanism of photoinduced carriers in magnetic heterojunction. Here, a magnetic heterojunction, BiOI/BaFe 12 O 19 , was synthesized by a simple preparation method. The optimal synthesis conditions and photocatalytic reaction conditions were explored. The growth mechanism of bismuth iodide oxide (BiOI) was elaborated by introducing a micromagnetic field stemming from barium ferrite (BaFe 12 O 19 ). The electrochemical impedance spectroscopy (EIS), Mott–Schottky curve (MS), transient fluorescence spectrometer (PL), and photocurrent response plot (i ~ t) tests indicated that the BiOI/BaFe 12 O 19 possessed a higher transfer capacity of electrons, higher separation efficiency of photoinduced carriers, stronger photocurrent response, and higher carriers density, compared with pure BiOI. The ultraviolet–visible diffuse reflectance spectrophotometer (UV–vis DRS), electron paramagnetic resonance spectrometer (EPR), MS, and quenching experiments revealed band structure configuration and migration mechanism of photoinduced carriers. The enhancement mechanism of photocatalysis and photocatalytic reaction mechanism was clearly proclaimed in BiOI/BaFe 12 O 19 catalytic system. Graphical Abstract
研究领域:
材料科学
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化学
·
光催化
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磁学
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产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Chao Yin,Fanan Wei,Shihan Fu,Zhushan Zhai,Zhixing Ge,Ligang Yao,Minlin Jiang,Ming Liu
Soft actuators that exhibit large deformation and can move at a fast speed in response to external stimuli have been in high demand for biomimetic applications. In this paper, we propose a convenient approach to fabricate a reversible and thermal-responsive composite hydrogel. Under the irradiation of visible light, the striped hydrogel can bend at a speed of up to 65.72°/s with carbon nanotubes loaded at a concentration of 3 mg/mL. A jellyfish-like miniature soft robot is made using this hydrogel. When driven by visible light, the robot can move at a maximum speed of 3.37 mm/s. Besides swimming, other motion modes, including walking and jumping, are also achieved by the robot. In addition, the robot can perform directional transportation of tiny objects. As a new actuation approach for the research of jellyfish-like miniature soft robots, this work is of great significance to the development of flexible bionic robots. Moreover, this work also offers some important insights into the research of biomimetic robots driven by visible light.
研究领域:
材料科学
·
仿生学
·
机器人学
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DOI
PubMed
高影响因子
Advanced Materials Technologies
·
2021
·Vol. 7
·期 1
·2100687
·
IF 7.848
Yin Chen,Huanhua Yang,Mingliang Li,Shilu Zhu,Shuo Chen,Liuyi Dong,Fuzhou Niu,Runhuai Yang
Untethered biocompatible microswimmers driven by micromotors in fluids can enable innovative technologies in fields such as biology and chemical and biomedical engineering. However, efficiently driving and controlling the movement of microswimmers by light remains a challenge. Herein, a method for fabricating a light-driven microswimmer with built-in micromotors and 3D-printed multiscale features that exhibits high photocatalytic performance is proposed. TiO 2 -CaCO 3 composite microparticles (TC) are fabricated as highly efficient micromotors that provide high photocatalytic efficiency in bubble generation, while 3D-printed hydrogels are fabricated as TiO 2 -CaCO 3 /PEGDA (TC/P) microswimmers that provide biocompatibility, large specific surface area, and controllable movement. The results show that TC micromotors produced by physical mixing at a specific concentration exhibit a large specific surface area, reduced agglomeration, increased photocatalytic active sites, and improved photocatalytic stability. TC micromotors are effectively loaded into the porous hydrogel by 3D printing for multiscale fabrication to improve the photocatalytic performance across scales and realize effective and directional driving under violet light excitation. The TC/P microswimmers exhibit stable catalysis and motion in 7 days, at which point the catalysis by TiO 2 is already ineffective. With stability, biocompatibility, and biomedical functions, this multiscale fabricated microswimmer exhibits great potential in micromanipulation and targeted therapy.
研究领域:
生物学
·
化学工程
·
生物医学工程
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）