Nature Photonics
·
2024
·Vol. 18
·期 11
·1185-1194
·
IF 32.3
Xu Qingyang,Zhang Jianyu,Sun Jing Zhi,Zhang Haoke,Tang Ben Zhong
Manipulating the electronic structure of organic functional materials by through-space conjugation (TSC) to achieve desirable photophysical properties has been a long-standing research focus. Although the working mechanisms of TSC have been demonstrated, the roles that the intrinsic molecular skeleton and extrinsic aggregates play remain unclear. Here four trinaphthylmethanol isomers and four trinaphthylmethane (TNM) isomers with varying connecting sites of naphthalene were synthesized, and their photophysical properties were systematically investigated. The strength of TSC was found to rise from 222-TNM to 111-TNM with the increased number of 1-naphthalene units. In particular, 111-TNM was found to support efficient long-wavelength clusteroluminescence with an absolute quantum yield of 55%. Experimental and theoretical results revealed that the inherent attribute of robust intramolecular interactions within individual molecules is fundamental for ultrastrong TSC, and intermolecular interactions play an auxiliary role in fortifying and stabilizing intramolecular interactions. This work reveals the intrinsic and extrinsic factors for manipulating TSC and provides a reliable strategy for constructing non-conjugated luminogens with efficient clusteroluminescence.
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Nature Photonics
·
2024
·
IF 32.3
Liu Gaochao,Chen Weibin,Xiong Zhan,Wang Yuzhen,Zhang Shuai,Xia Zhiguo
High-power broadband near-infrared (NIR) light sources based on laser-excited phosphors are highly desirable for photonics applications in night vision, biomedical imaging and sensing; however, the inherent energy gap law poses a great challenge for the development of efficient NIR luminescent materials. Herein we report a translucent MgO:Cr 3+ ceramic fabricated by spark plasma sintering, which exhibits a broadband NIR emission peak at 810 nm, with an external quantum efficiency of 81% and ultra-high thermal conductivity of 52 W m –1 K –1 . When pumped with a blue laser, the MgO:Cr 3+ ceramic provides an output power exceeding 6 W with a light conversion efficiency of 29%. This laser-driven broadband NIR light source makes it possible to perform NIR imaging with a spatial resolution of 6 lp mm –1 , and is a promising technology for emerging imaging applications.
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MICROCHIMICA ACTA
·
2025
·Vol. 192
·期 10
·1-13
·
IF 5.3
Meng Dongling,Chen Zhiyan,Chen Zhibin,Cen Junrao,Li Jitao,Yang Yaling
Iron-cerium co-doped carbon dots (Fe,Ce-CDs) were synthesized by one-step hydrothermal method using tartaric acid and L-tryptophan as ligands. Fe,Ce-CDs shows excellent peroxidase-like (POD) activity and nitrite (NO 2 − ) can promote the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) to its blue oxidation product (oxTMB) due to the formation of ∙NO 2 free radical. NO 2 − further react with oxTMB to form a yellow color via diazotization resulting in the absorbance Change at 450 nm. By Fe,Ce-CDs + NO 2 − + TMB + H 2 O 2 and oxTMB + NO 2 − systems, a dual-signal colorimetric nanosensor for NO 2 − detection is developed with lower detection limits (LODs) of 0.272 μg/L and 0.019 mg/L, respectively. The proposed methods were applied to the detection of NO 2 − in tobacco samples with good recovery from 91.20 to 110.61%, achieving similar results and indicating their high accuracy and feasibility. Graphical
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PubMed
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International Journal of Environmental Research
·
2025
·Vol. 19
·期 6
·1-19
·
IF 3.5
Zhang Wen-hao,Wei Yu,Yu Qi,Wang Chun-heng,Lei Xue-fei,Luo Shao-hua,Chen Huan-huan,Mu Wen-ning
Phenol, as a representative organic pollutant in industrial wastewater, poses a critical challenge for environmental remediation. In this study, titanium-doped iron tailings-based heterogeneous catalysts (Ti/PCG) with enhanced electron transfer kinetics were synthesized via a high-temperature sintering method and evaluated for their photo-Fenton degradation efficiency toward phenol. The Ti/PCG catalysts were systematically characterized via SEM, BET, XPS, and photoelectrochemical analyses to elucidate their structural and electronic properties. Results indicated that 15% TiO 2 -doped Ti/PCG exhibited optimal properties, including the largest specific surface area, well-developed hierarchical pore structures, superior charge transfer capacity, and high carrier separation efficiency. Under optimized conditions (pH = 2.75, 0.2 ml H 2 O 2 (30 wt%), and 1 h light irradiation), the 15% Ti/PCG achieved 80.68% removal of phenol (initial concentration: 100 ppm). Mott-Schottky and VB-XPS analyses confirmed the n-type semiconductor behavior of the 15% Ti/PCG, with a conduction band (E CB ) at − 0.455 eV and a valence band (E VB ) at 2.09 eV, enabling the proposal of a plausible photo-Fenton degradation mechanism. Radical trapping experiments further demonstrated that hydroxyl radicals (·OH) and superoxide radicals (·O 2 − ) dominated the phenol degradation process. This work provides an optimized photo-Fenton strategy for phenol-laden wastewater treatment with 80.68% degradation efficiency, while demonstrating the potential of industrial solid wastes as sustainable catalysts in environmental remediation.
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Nano Research
·
2024
·Vol. 17
·期 6
·5261-5269
·
IF 9.5
Li Zhiming,Li Xinyu,Ma Haiqing,Ye Chenliang,Yu Hongan,Nie Long,Zheng Meng,Wang Jin
Non-Pt or low-Pt catalysts capable for stable generation of hydrogen via water electrolysis at an industrial level of current density are highly demanded. Construction of strong metal-support connection is beneficial to improve the performance stability of electrocatalysts. Here we employed highly defective N-doped carbon nanotubes (d-N-CNT) as the support to achieve uniform and firm anchoring of Ru clusters (~ 1.9 nm) via a thermal-shock strategy. The as-prepared Ru/d-N-CNT catalyst shows excellent catalytic activity for hydrogen evolution reaction (HER) in alkaline media and requires an overpotential (η) of 12 mV at 10 mA·cm −2 and 116 mV at 200 mA·cm −2 with a Ru loading of 0.025 mg·cm −2 . Impressively, Ru/d-N-CNT presents robust stability for HER at both low current density (stable for at least 1000 h at 10 mA·cm −2 ) and the industrial level of current density (stable for at least 100 h at 1000 mA·cm −2 ), remarkably outperforming commercial Pt/C and Ru/C. The highly defective nature of the N-CNT support endowed the as-prepared Ru/d-N-CNT catalyst with strong metal–support adhesion that efficiently suppressed agglomeration as well as obscission of Ru clusters. Meanwhile, the rich defects increased the surface energy of the N-CNT support and resulted in improved hydrophilicity as evidenced by the liquid contact angle measurement and the bubble evolution process, which also played an important role in stabilizing the HER performance especially at large current density.
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Science China-Materials
·
2024
·Vol. 67
·期 4
·1310-1319
·
IF 6.8
Chen Panpan,Shang Xue,Hang Tian
Owing to their excellent properties, such as good conductivities and chemical stabilities, conductive polymers have been extensively studied for use in various applications. Three-dimensional (3D) conductive polymers, which contain interconnected and continuous networks with high specific surface areas, are encouraging platforms with superior performance. Despite rapid advances in nanofabrication technology, achieving ordered conductive polymer superstructures such as those in aligned nanochannels, remains challenging. Herein, we report a facile and efficient template synthetic method to fabricate 3D polypyrrole membrane structures. With flexible, track-etched polycarbonate membranes used as templates, polypyrrole nanotube arrays with tunable lengths and diameters were synthesized via chemical polymerization. Free-standing, 3D nanotube array membranes with vertically aligned channels and continuous connecting layers were obtained simply by template removal. This “getting membrane with membrane” approach is also scalable and low-cost. We further demonstrated that delicate membrane structures could be used as adsorbents, solar steaming materials, and gas sensors. They exhibited quick and excellent adsorption of Cr(VI) ions, served directly as a solar interfacial evaporator without surface modification or substrate support, and showed an extraordinary sensing response to NH 3 . Our work provides a feasible way to fabricate polypyrrole superstructures and expands the applications of 3D conductive polymer materials.
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RESEARCH ON CHEMICAL INTERMEDIATES
·
2016
·Vol. 42
·期 6
·6181-6190
·
IF 1.833
Wang Meng-Meng,Liu Shi-Wei,Li Lu,Yu Shi-Tao,Xie Cong-Xia,Song Zhan-Qian
Rosin hydrogenation using polyvinylpyrrolidone (PVP)-stabilized Pd colloidal nanoparticles as catalyst in an aqueous/organic biphasic system was investigated. The influence of preparation methods on the size of Pd nanoparticles for hydrogenation of rosin was marked. Compared with traditional catalysts Pd/C and Raney-Ni, PVP-stabilized Pd colloidal nanoparticles showed excellent catalytic activity and promoted formation of the product tetrahydroabietic acid (THAA). More than 93 % rosin was hydrogenated, and the mass fraction of THAA was 54.2 % when the reaction was carried out at 160 °C for 4 h. It was also found that PVP-stabilized Pd colloidal nanoparticles exhibited good reusability for hydrogenation, with no obvious decrease in catalytic performance when reused six times.
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BMC Ophthalmology
·
2023
·Vol. 23
·期 1
·1-24
·
IF 2
Zhang Zengrui,Mu Jingyu,Wei Jing,Geng Haoming,Liu Chunmeng,Yi Wenhua,Sun Yue,Duan Junguo
Background Refractive errors are one of the most common ocular conditions among children and adolescents, with myopia showing an increasing prevalence and early onset in this population. Recent studies have identified a correlation between refractive errors and ocular biometric parameters. Methods A systematic search was conducted in electronic databases including PubMed, EMBASE, Cochrane Library, Web of Science, and Medline from January 1, 2012, to May 1, 2023. Various ocular biometric parameters were summarized under different refractive states, including axial length (AL), central corneal thickness (CCT), anterior chamber depth (ACD), lens thickness (LT), corneal curvature (CC), Corneal curvature radius (CR),axial length-to-corneal radius ratio (AL/CR ratio), choroidal thickness (ChT), retinal thickness (RT), retinal nerve fiber layer thickness (RNFL), and retinal blood density (VD). The differences in these parameters among different refractive states were analyzed using Stata software with fixed or random-effects models, taking into account the assessed heterogeneity level. Results This meta-analysis included a total of 69 studies involving 128,178 eyes, including 48,795 emmetropic eyes, 60,691 myopic eyes, 13,983 hyperopic eyes, 2,040 low myopic eyes, 1,201 moderate myopic eyes, and 1,468 high myopic eyes. The results of our study demonstrated that, compared to the control group (emmetropic group), the myopic group and low, moderate, and high myopic groups showed significant increases in AL, AL/CR ratio, and ACD, while the hyperopic group exhibited significant decreases. Compared to the control group, the myopic group had a significantly increase for CC, while CR, CCT, perifoveal RT, subfoveal ChT, foveal ChT, parafoveal ChT, perifoveal (except nasal) ChT, and pRNFL (except temporal) significantly decreased. Compared to the control group, the hyperopic group had a significantly increase for subfoveal ChT, foveal ChT, parafoveal ChT, perifoveal ChT, and nasal pRNFL. Compared to the control group, the low and moderate myopic groups had a significantly decreases for the CCT, parafoveal RT (except nasal), perifoveal RT (except nasal), and pRNFL (except superior and temporal). Compared to the control group, the high myopic group had a significantly increase for CR, while LT, perifoveal ChT (except nasal), parafoveal RT, perifoveal RT, and pRNFL (except temporal) had significant decreased. Conclusion The changes of ocular biometric parameters in children and adolescents are closely related to refractive errors. Ocular biometric parameters devices, as effective non-invasive techniques, provide objective biological markers for monitoring refractive errors such as myopia.
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CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2022
·Vol. 38
·期 5
·1232-1238
·
IF 2.726
Chen Weijie,Xia Huicong,Guo Kai,Jin Wangzhe,Du Yu,Yan Wenfu,Qu Gan,Zhang Jianan
Lithium-sulfur(Li-S) batteries have been puzzled by the “shuttle effect”. In the recent years, catalytic materials present a huge potential for solving this problem. However, the exploitation for catalytic activity was still challenging in Li-S batteries. In this article, we put forward a single atom catalyst (SAC) of FeN 4 coupled with Fe 3 C on the N-doped carbon (FeN 4 /Fe 3 C@NC) by one-step pyrolysis method. The FeN 4 and Fe 3 C synergistically catalyze the polysulfides conversion when the N-doped carbon provides the high conductive three-dimensional skeleton in Li-S batteries. As a result, the FeN 4 /Fe 3 C@NC shows a specific capacity of 1100 mA·h/g at 0.2 C(1 C=1675 mA/g). In addition, the FeN 4 /Fe 3 C@NC maintains 99.01% of the pristine specific capacity after 100 cycles at 0.5 C, indicating the improved electrochemical performance in Li-S batteries. This work sheds new lights on the design of engineering catalysts for developing high-performance Li-S batteries.
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CHINESE SCIENCE BULLETIN
·
2014
·Vol. 59
·期 27
·3449-3456
·
IF 1.365
Lei Ying,Liu Yu,Song Huiming,Sun Bo
Dendroclimatological techniques were employed to investigate the relationship between Chinese Pinus ( Pinus tabulaeformis Carr.) growth and climatic variability in the Mt. Yishan region of Shandong Province, China, over the past 253 years. Using regression analysis, the wetness index (WI) was reconstructed for the Mt. Yishan area for the period 1755–2007 AD based on tree-ring widths; predictor variables accounted for 40 % of the variance. The reconstructed time-series displayed an increasing trend after the late 1960s. Both the estimated and the observed WI for May–August were better correlated with precipitation than temperature during the period 1958–2007 AD, indicating that the contribution of precipitation to the WI was larger than temperature in the study area. The reconstructed WI was compared with the dryness/wetness index of China and land areas that were affected by droughts and floods using the agricultural statistics for Shandong Province. In addition, the WI time-series corresponded well with the peanut yield in Shandong Province at high frequency, which may be reasonable in the context of agriculture in Shandong. The 3-, 5- to 6- and 9- to 10-year periodicities detected in the time-series suggested that the reconstructed WI in the Mt. Yishan area may be related to large-scale climate variations.
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JOURNAL OF POLYMERS AND THE ENVIRONMENT
·
2024
·Vol. 32
·期 7
·3326-3341
·
IF 4.7
Wang Rui,Song Xin,Liu Li,Zhou Chao,Wu Guangfeng
Magnetic particles with active groups on their surfaces can be applied to wastewater purification to remove harmful ions, but the insufficient number of active groups on their surfaces tends to limit their removal rate of ions. Herein, we grafted different generations of dendritic macromolecular polyamidoamine (PAMAM) onto the magnetic chitosan microspheres (MCS) using ethylenediamine tetraacetic acid (EDTA) as core (MCEPs) for the removal of Cu (II). Firstly, 7 μm-sized MCS with good dispersibility was prepared by adjusting conditions such as glacial acetic acid content, emulsifier content and raw material ratio. Secondly, the effect of MCEPs generation, pH and contact time on the adsorption capacity were investigated. The adsorption experiments showed that the MCEPs had a high adsorption capacity, when the adsorbent was the second generation of MCEP (MCEP G2.0), the maximum adsorption capacity can up to 702.9 mg/g and the adsorption process can be completed in 60 min. Moreover, among various isotherms models, MCEP G2.0 was well-fitted by Langmuir adsorption isotherm. Also, adsorption kinetic studies proved that the adsorption mechanism of MCEP G2.0 adsorbent followed the pseudo-second-order kinetic model, demonstrating that the process was chemisorption. The adsorbent has renewability as well, after five adsorption cycles, its adsorption efficiency was still higher than 80%. Therefore, the adsorbent showed a superior adsorption capacity and renewability to remove Cu (II). Graphical
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JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 41
·16105-16118
·
IF 4.5
Wang Shi,Dang Chenyang,Li Mengli,Gu Li,Wu Jun,Cao Xuebo
Efficiently harnessing abundant and renewable solar energy for sustainable and continuous municipal sewage or industrial outlet water treatment to deal with water crisis has been an urgency for researchers in the past decades. Herein, a scalable and cost-effective solar steam device built up of surface-carbonized cane (CC) and Bi 2 WO 6 nanoflower photocatalyst is demonstrated, which exhibits high efficiency for concurrent waste water treatment and solar-to-water evaporation. CC is chosen as artificial core component in this system due to its nature-made periodic micro-/nanochannels, low heat conductivity, which contributes to extraordinary water transport, evaporation capacity and thermal management. Compared to natural cane, CC exhibits remarkably enhanced light absorption capacity and solar-to-water evaporation efficiency. Moreover, through the modification of Bi 2 WO 6 nanoflower, the system shows an optimized utilization of absorbed photons for high redox charge carriers in photocatalytic degradation and heat generation to promote the water treatment, leading to enhanced pollutant degradation efficiency. The steam generation performance reaches up to 1.417 kg·m −2 ·h −1 and solar-to-water evaporation efficiency of ~ 91.7% under 1 sun irradiation, which are among the highest values in the literatures. Continuous water purification and freshwater production from municipal sewage are also carried out in a home-made tandem system. Graphical abstract
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危险品化学品经营许可证（带存储）