CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Luyin Zhao,Jingmei Li,Jiayun Shao,Ling Zhang,Yuhao Ji,Xiulong Li,Dianmin Ju
The contamination of water resources in recent years has resulted in the dissemination of harmful bacteria via water sources, posing a significant threat to the safety and well-being of humans, animals, and plants. Consequently, there is a growing concern over the health and sanitation of water resources. Photocatalysis, a novel and very effective antibacterial method, has gained significant attention in the area of antibacterial research. Bismuth nitrate pentahydrate and sodium tungstate dihydrate were used in a straightforward hydrothermal process to create nanoflower spheres Bi 2 WO 6 /ZnO photocatalytic composites in molar ratios of 1:1, 1:2, 1:3, and 1:4. The first-ever demonstration of the photocatalytic broad-spectrum antibacterial activity of porous nanoflower spheres Bi 2 WO 6 /ZnO composites was shown. The samples were analyzed using X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), Fourier-transform infrared spectroscopy (FT-IR), and ultraviolet–visible spectroscopy (UV–vis). The antibacterial activity was evaluated using the dilution coated plate technique, with LED light irradiation. The findings indicate that the Bi 2 WO 6 /ZnO composite has a much superior antibacterial activity against both bacteria and fungus compared to individual Bi 2 WO 6 and ZnO. When exposed to LED lighting with an intensity of 35 W, the Bi 2 WO 6 /ZnO nanoparticles in a 1:2 ratio at a concentration of 1000 mg/L demonstrated complete antibacterial effectiveness against Escherichia coli, Staphylococcus aureus, Pseudomonas aeruginosa, and Bacillus subtilis within 30 min. Similarly, the nanoparticles achieved 100 % antibacterial efficiency against Candida albicans within 90 min. The antibacterial efficacy of 1000 mg/L 1:2 Bi 2 WO 6 /ZnO nanoparticles against Escherichia coli and Staphylococcus aureus was found to be 100 % within 5 min under natural lighting conditions. The findings indicate that Bi 2 WO 6 /ZnO nanoparticles have excellent photocatalytic broad-spectrum antibacterial efficacy.
研究领域:
环境科学
·
微生物学
·
材料科学
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产品关联
DOI
高影响因子
ACS Nano
·
2024
·
IF 15.8
Meiqin Xiao,Jonghee Yang,Wei Zhang,Long Xu,Jidong Zhang,Wenzhe Li,Chen Chen,Tingwei Zhou,Haoyue Zhang,Bo Chen,Junzhong Wang,Ping Chen
Although quasi-two-dimensional (quasi-2D) perovskites are ideal material platforms for highly efficient linearly polarized electroluminescence owing to their anisotropic crystal structures, so far, there has been no practical implementation of these materials for the demonstration of linearly polarized perovskite light-emitting diodes (LP-PeLEDs). This scarcity is due to difficulty in orientation and phase distribution control of the quasi-2D perovskites while minimizing the defects, all of which are required to manifest aligned transition dipole moments (TDMs). To achieve this multifaceted goal, herein, we introduce a synergistic strategy to quasi-2D perovskites by incorporating both a trimethylolpropane triacrylate anchoring layer and 18-Crown-6 molecular passivator into the film fabrication process. It is found that the interfacial anchoring layer guides the oriented growth of perovskites along the (110) plane, whereas the molecular passivator reduces the number of defects and homogenizes the crystal phase. As a result, a quasi-2D perovskite film with macroscopically aligned TDM that renders high radiative recombination and the degree of linear polarization (DoLP) is constructed. This “coherence-programmed emission layer” demonstrates highly efficient LP-PeLEDs, not only achieving a maximum external quantum efficiency of ∼23.7%, a brightness of ∼36,142 cd/m2, and a DoLP of ∼38%, but also significantly improving the signal-to-interference-and-noise ratio in a multi-cell visible light communication system.
研究领域:
材料科学
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光学工程
·
电子器件
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产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Hongxin Liu,Min He,Sijie Zhang
The bromide–chloride mixed quasi-two-dimensional (2D) perovskite, with a natural quantum well structure and tunable exciton binding energy, has gained significant attention for high-performance blue perovskite light-emitting diodes (PeLEDs). However, the relative importance of having a low trap state density or efficient exciton transfer for high-efficiency electroluminescence (EL) performance remains elusive. Here, two molecules with the benzoic acid group, sodium 4-fluorobenzoate (SFB) and 3,5-dibromobenzoic acid (DBA), are used to modulate the phase distribution and trap state to explore the effect between energy transfer and defect passivation. As a result, when the n = 1 phase is inhibited in both films, the DBA@SFB-modified perovskite films achieve a higher photoluminescence quantum yield (PLQY) than the SFB-modified perovskite films due to effective defect passivation. However, DBA@SFB-modified PeLEDs exhibit lower external quantum efficiency (EQE) compared to SFB-modified PeLEDs due to the poor exciton transfer between the low-dimensional phase. This demonstrates that passivation strategies may enhance photoluminescence through reducing nonradiative recombination, but the effect of phase distribution is pivotal for EL performance by efficient energy transfer in quasi-2D perovskites. Femtosecond time-resolved transient absorption measurements confirm the fastest carrier dynamics in SFB-modified perovskite films, further corroborating the above result. This work provides useful information about phase modulation and defect passivation for high-efficiency blue quasi-2D PeLEDs.
研究领域:
材料科学
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光电子学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2024
·
IF 3.5
Hu Quanli,Su Wang,Luo Hanqiong,Wang Yin,Liu Jinghai
The electrospun light rare earth orthochromites RCrO 3 (R = La, Pr, Nd, Sm, Eu) nanofibers have perovskite-type orthorhombic structures. Raman spectra proved the typical vibration modes of the rotation, bending, and stretching of the CrO 6 octahedra in RCrO 3 nanofibers. The rare earth element with large ion radius, low electronegativity, and remarkable affinity for oxygen, and the rich redox reaction of Cr endow RCrO 3 a potential energy storage material for supercapacitors. It is highly significant to investigate the electrochemical properties of RCrO 3 . The electrochemical properties of the RCrO 3 nanofibers as supercapacitor electrodes were elucidated. At 0.5 A/g, the LaCrO 3 , PrCrO 3 , NdCrO 3 , SmCrO 3 , and EuCrO 3 nanofibers exhibited the specific capacitance values of 267.8, 132.8, 157.6, 170.5, and 170.4 F/g, respectively. First-principles density functional theory method was used to clarify the electronic structure and total density of states of the RCrO 3 nanofibers. This study provides a rational design and fabrication method to pseudocapacitor electrodes.
研究领域:
材料科学
·
电化学
·
理论计算
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产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2024
·
IF 7.1
Xiaozhen Ma,Xiaolin Wang,Honglong Zhao,Minghui Cui,Xiaobo Xu,Fangfang Kong,Peng Chen,Ning Yan,Jin Zhu,Jing Chen
In this study, we successfully synthesized lignin-based covalent adaptable polyurethane networks containing lignin-graphite nanosheet composite particles with a light controllable positive temperature coefficient (LPTC) effect. The use of lignin facilitated the direct exfoliation of graphite, thus overcoming the challenge of achieving a uniform dispersion of conductive fillers in the polymer matrix. The exfoliated graphite had a thickness of approximately 3.0 nm, which was equivalent to three to five layers of graphene. By preparing lignin-based covalent adaptable polyurethane without graphite composite particles (LPU) and lignin-based covalent adaptable polyurethane with graphite composite particles (LPU-G), we achieved remoldable properties and a high LPTC intensity for LPU-G. LPU-60G (60 represents the mass fraction of lignin-graphite nanosheets in polyols) exhibited an excellent LPTC effect, with sharp increases in resistance under light, particularly under near-infrared light (NIR), enabling the control of the current in circuits. Additionally, both LPU and LPU-G demonstrated degradability by slowly degrading in a PBS solution while rapidly degrading in an alkaline solution. Overall, the LPU-G synthesized in this study displayed superior stability in the LPTC effect and possessed degradability, providing a promising avenue for the future development of smart materials.
研究领域:
材料科学
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高分子化学
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智能材料
✓ 已验证
产品关联
DOI
高影响因子
ECS Solid State Letters
·
2015
·Vol. 4
·期 5
·R27
·
IF 1.162
Jia Zhao,Yu Zhang,Xiaoyu Zhang,Yu Wang,Siyao Yu,Wenzhu Gao,Hairong Chu,Yiding Wang,Jun Zhao,William W. Yu
Eight-segment LED displays were designed and fabricated using quantum dot light-emitting diodes. CdSe/CdS/ZnS core/shell quantum dot were employed as the emitting layer sandwiched by poly(N,N'-bis(4-butylphenyl)-N,N'-bis(phenyl)benzidine) (Poly-TPD) and an electron transport layer of ZnO nanoparticles. Each segment exhibited luminance, power efficiency and external quantum efficiency of 5380 cd/cm2, 2.63 lm/W and 1.2%, respectively. The uniformity of the eight segments was analyzed based on the current-density and luminance versus driving voltage. The good uniformity indicates that the as-designed device is useful and promising for general electroluminescent display applications.
研究领域:
材料科学
·
光电工程
✓ 已验证
DOI
高影响因子
ATMOSPHERIC ENVIRONMENT
·
2024
·
IF 4.2
Chunyan Zhang,Qingxin Ma,Peng Zhang,Tianzeng Chen,Yonghong Wang,Biwu Chu,Hao Li,Jikun Li,Chuncheng Chen,Jincai Zhao,Hong He
As the main source of atmospheric sulfate aerosol , the aqueous-phase oxidation of SO 2 has been of great concern. Traditionally, the aqueous-phase oxidation of SO 2 is considered a consumption process of atmospheric oxidation capacity; however, we report here that •OH radicals and other reactive oxygen species (ROS) can be generated in the photochemical reactions of bulk HSO 3 − solution. This •OH production pathway results in the fast sulfate formation in the photooxidation of dissolved SO 2 . The photochemical process is determined to be pH-dependent in which sulfate formation is promoted by decreasing pH. Hence, a light - driven acidic positive feedback mechanism is proposed that the oxidation of dissolved SO 2 and the formation of •OH radicals have a synergistic promoting effect. These results indicate that the photochemistry of dissolved SO 2 could be a missing source of aqueous •OH radicals as well as sulfate at regional to global scales.
研究领域:
大气科学
·
环境化学
✓ 已验证
DOI
高影响因子
ACS Omega
·
2021
·
IF 3.512
Chenglong Wang,Fan Meng,Luyang Qiao,Yuyan Xie,Xin Liu,Jinhuan Zheng
A self-lubricating hydrogel filament was achieved by establishing an in situ photocuring system and using camphorquinone/diphenyl iodonium hexafluorophosphate (CQ/DPI) as the blue-light photoinitiators, acrylamide (AM) and N,N-dimethylacrylamide (DMAA) as the monomers, polyethylene glycol diacrylate (PEGDA) as the cross-linker, and lecithin as the lipid lubricant. The blue-light photopolymerization efficiency and the photorheological properties of the hydrogel precursor were investigated by photodifferential scanning calorimetry and a photorheological system. With the increase of DMAA, the photopolymerization efficiency of the precursor improved, while the elasticity of poly(DMAA/AM) decreased accordingly. The physical cross-linking effect between lecithin and the poly(DMAA/AM) network led to improved polymerization properties and elasticity. The lipid-based boundary layer at the hydrogel surface endowed the self-lubrication of the hydrogel filament. The extruded hydrogel filaments exhibited excellent mechanical properties and weavability, which were expected to play a realistic role in soft robots and bioengineering.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
DOI
高影响因子
e-Journal of Surface Science and Nanotechnology
·
2016
·
IF 0
T. Wei,L. Z. Pei,N. Lin
Ce doped germanium dioxide nanowires with cubic GeO2 and tetragonal CeGeO4 phases have been synthesized by the hydrothermal route using sodium dodecyl sulfate (SDS) as the surfactant. The nanowires have the length and diameter of about 20 μm and 50–200 nm, respectively. The SDS assisted growth process is proposed to explain the formation of the Ce doped germanium dioxide nanowires. Ce doped germanium dioxide nanowires is used as the photocatalyst for the photocatalytic degradation of gentian violet (GV) under solar light irradiation. The roles of the solar light irradiation time, content of the nanowires and GV concentration on the photocatalytic degradation of GV are investigated. GV can be totally degraded under solar light irradiation for 240 min using 15 mg nanowires in 10 mL GV solution with the concentration of 10 mg · L−1. The Ce doped germanium dioixde nanowires show good application potential for the removal of organic pollutants under solar light irradiation. [DOI: 10.1380/ejssnt.2016.4]
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
ChemistrySelect
·
2022
·Vol. 7
·期 34
·e202202563
·
IF 2.307
Yihuo Liu,Siyu Ding,Mingli Xu,Jinli Xu,Dongping Cheng,Hong Wang,Xiaoliang Xu
Graphical Various arylacylated oxindoles are synthesized from the visible-light- promoted tandem reaction of N-arylsulfonyl-acrylamides with α-oxocarboxylic acids. The products are obtained under mild conditions. A visible-light-promoted radical tandem reaction of N-arylsulfonyl-acrylamides with α-oxocarboxylic acids is described. It undergoes decarboxylation, Smiles rearrangement, and intramolecular cyclization under mild reaction conditions, providing a series of arylacylated oxindoles with potential pharmacological activities.
研究领域:
有机化学
·
药物化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2018
·Vol. 6
·期 37
·9897-9902
·
IF 5.976
Hong Wang,Peisheng Zhang,Baiju P. Krishnan,Maolin Yu,Jie Liu,Mingju Xue,Shu Chen,Rongjin Zeng,Jiaxi Cui,Jian Chen
The development of switchable white-light emitters is extremely challenging but urgently needed for various applications. We describe a class of switchable fluorescent polymeric nanoparticles (SFPNs) that can alternate their emission color among stable white, cyan, or pink. These SFPNs consist of a dye with cyan-light emission and a spiropyran (SP) derivative with photochromism. When the SP derivative is transferred to its merocyanine state, fluorescence resonance energy transfer (FRET) occurs from the cyan dye to the merocyanine one. In a rational design of transfer efficiency, a stable white-light emission is achieved. This white-light emission can be switched to the cyan-light one upon photoirradiation or pink-light one by solvent-induced swelling. Such multi-color fluorescent alternation is reversible and therefore allows for data encryption. Because of the facile synthesis, excellent long-term stability, fast photo-responsibility, high-contrast fluorescence, and outstanding switchability of these nanoparticles, we envision that they should have great potential in various applications such as high-resolution imaging, white luminescence, and data encryption.
研究领域:
材料科学
·
光学
·
纳米技术
·
光化学
·
数据安全
✓ 已验证
DOI
高影响因子
Frontiers of Environmental Science & Engineering
·
2022
·Vol. 17
·期 2
·1-11
·
IF 6.048
Yang Fan,Li Junpeng,Wang Huan,Xiao Xiaofeng,Bai Rui,Zhao Feng
Manganese oxides are widely distributed in soils and sediments, affecting the migration and transformation of heavy metals and organic pollutants. The microbial conversion of soluble Mn(II) into insoluble Mn(III/IV) oxides is considered to be the initial source of manganese oxides in the environment; however, whether this process is related to a physiological role remains unclear. Here, we explored the microbial manganese oxidation process under visible light by using coastal surface seawater microorganisms. Visible light greatly promotes the oxidation rate of Mn(II), and the average rate reaches 64 µmol/(L·d). The generated manganese oxides were then conducive to Mn(II) oxidation, thus the rapid manganese oxidation was the result of the combined action of biotic and abiotic, and biological function accounts for 88 % ± 4 %. Extracellular superoxide produced by microorganisms induced by visible light is the decisive factor for the rapid manganese oxidation in our study. But the production of these superoxides does not require the presence of Mn(II) ions, the Mn(II) oxidation process was more like an unintentional side reaction, which did not affect the growth of microorganisms. More than 70 % of heterotrophic microorganisms in nature are capable of producing superoxide, based on the oxidizing properties of free radicals, all these bacteria can participate in the geochemical cycle of manganese. What’s more, the superoxide oxidation pathway might be a significant natural source of manganese oxide.
研究领域:
环境微生物学
·
地球化学
·
水文学与水资源
✓ 已验证
DOI
高影响因子
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