Materials
·
2025
·Vol. 18
·期 23
·
IF 3.2
Wenjie Zhou,Tao Du,Changbai Long
High-efficiency, lead-free dielectrics are sought for pulsed-power capacitors, yet pristine Bi0.5Na0.5TiO3(BNT) suffers from large remanence, high coercivity, and limited breakdown strength. Here, we report (1 − x)Bi0.5Na0.5Ti0.97Nb0.03O3-xSr0.85Ba0.15Ta0.5+0.02xAl0.5−0.02xO3(BNTNb–SBTA, x = 0–0.15) ceramics synthesized via solid-state reaction, achieving enhanced relaxor ferroelectric behavior through multi-cation substitution at A- and B-sites. X-ray diffraction confirms a pure perovskite solid solution, while scanning electron microscopy reveals grain refinement, suppressing oxygen vacancies and boosting the breakdown strength. Raman and dielectric analyses evidence strengthened relaxor behavior, accompanied by loop slimming and a systematic rise in breakdown strength. The composition x = 0.10 achieves the best trade-off, deliveringWrec= 3.357 J cm−3andη= 90.5% atEb= 240 kV cm−1. Robust operational stability is demonstrated with small variations ofWrec/ηover 0.1–200 Hz, 25–175 °C, and 106cycles. Pulsed tests show fast discharge (∼26 ns) withWd= 0.826 J cm−3at ∼90% efficiency under moderate fields. These results indicate that synergistic A/B-site disorder (Sr/Ba on A-site; Ta/Al with Nb on B-site), combined with microstructural densification, effectively minimizesPrwhile elevatingEb, enabling high-efficiency energy storage under practical operating conditions.
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DYES AND PIGMENTS
·
2015
·
IF 3.966
Jingyue Xu,Ying Li,Luokai Wang,Yanjun Huang,Danlei Liu,Rui Sun,Jialin Luo,Chunyan Sun
A facile aptamer-based sensing strategy was developed for dopamine through the fluorescence resonance energy transfer (FRET) between rhodamine B (RB) and gold nanoparticles (AuNPs). The different affinities of unbound and bound aptamers toward AuNPs were employed to modulate the FRET efficiency for signal transfer. Dopamine-binding aptamers (DBA) could protect AuNPs from salt-induced aggregation, resulting in the fluorescence quenching of RB via FRET. Specific binding of DBA with dopamine formed the structured complex, losing the capability to stabilize AuNPs, thus the salt-induced aggregation of AuNPs led to the decrease of fluorescence quenching ability. Correspondingly, the fluorescence intensity of RB recovered along with the dopamine concentration ranging from 26 to 2.90 × 10 3 nM with the detection limit of 2 nM. This method was successfully applied for dopamine determination in swine feeds and chicken livers. Owing to its high sensitivity, excellent selectivity and convenient procedure, this strategy will provide a promising alternative for dopamine screening.
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PROGRESS IN ORGANIC COATINGS
·
2025
·
IF 7.3
Shenghua Yang,Jinming Guo,Hongyu Yuan,Haixia Xiao,Xiaming Feng,Hongyu Yang,Cheng Yan,Wei Cai
Intumescent flame-retardant (IFR) systems are attractive alternatives to conventional halogenated flame retardants due to their halogen-free composition, efficiently reduced heat release, and low toxicity generation. Herein, a nitrogen–boron (N B) dual-element flame retardant, melamine borate (MB), was synthesized and subsequently incorporated into a UV-curable resin based on bis(2-methacryloxyethyl) phosphate to construct a ternary synergistic N/P/B IFR coating system. The structure, thermal stability, and flame-retardant properties of the resulting coatings were systematically investigated by various techniques and combustion tests. Increasing MB content raised the glass transition temperature (T g ), indicating enhanced network compactness and stability. The coating containing only 4 wt% MB achieved a UL-94 V -0 rating and exhibited a 56.35 % reduction in total smoke production (TSP), along with significantly improved thermal stability in terms of decomposition temperature and char residue. The synergistic contributions of phosphorus, nitrogen, and boron promote catalytic charring, gas release, and glass-phase reinforcement, leading to the formation of a dense, stable char barrier. This eco-friendly ternary IFR system overcomes the high loading requirements and toxicity concerns of conventional flame retardants, providing a promising strategy for the efficient and sustainable flame-retardant modification of polymeric coatings.
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ENERGY & FUELS
·
2025
·
IF 5.3
Mingqiang Chen,Yupei Li,Yishuang Wang,Defang Liang,Chang Li,Haosheng Xin,Jun Wang
Catalytic depolymerization of lignin (CDL) is a prospective technology for the efficient utilization of biomass. In this paper, novel B–Ti-modified diatomite-supported nickel phosphide catalysts (xNiP/BTD) were prepared to depolymerize lignin in a unique formic acid-assisted aqueous-phase glycerol medium. Under optimal conditions, 4NiP/BTD exhibited 100% lignin conversion and 95.4% lignin oil (LO) yield, in which the yield of petroleum ether (PE)-soluble product reached 20.6%. Based on the characterization results, the superior performance of 4NiP/BTD for CDL was attributed to the collaborative effect of metallic Ni0 centers and acidic sites within Ni3P species. Among these, metallic Ni0 sites activated formic acid and aqueous-phase glycerol to generate active hydrogen (denoted as H*); subsequently, lignin was dominantly converted into phenol and alkyl guaiacol under the comprehensive function of H*, Lewis (Niδ+ species), and Bronsted acid sites (P–OH groups). Additionally, a potential reaction pathway for CDL with 4NiP/BTD as the catalyst was suggested. This study established a feasible approach for the efficient conversion of lignin using crude glycerol and green clay resources.
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POLYHEDRON
·
2025
·
IF 2.6
Tiantian Luo,Junyi Wang,Ruiyan Wang,Jiale Wang,Hao Yan,Bei Zhang,Qi Zhou
In this study, a one-dimensional core–shell photocatalyst composed of hydrogenated TiO 2 (H-TiO 2 ) coated with an amorphous metal–organic framework (MOF) was synthesized via a simple hydrothermal method and applied as an efficient peroxymonosulfate (PMS) activator for Rhodamine B (RhB) degradation. Under simulated sunlight irradiation for 20 min, the optimized H-TiO 2 /BPDC*2 catalyst achieved 99.40 % RhB removal at an initial concentration of 100 mg/L. Its apparent kinetic rate constant was 4.28 and 1.06 times higher than those of H-TiO 2 and H-TiO 2 /BPDC, respectively. The enhanced performance is attributed to the core–shell heterojunction structure, which improves light absorption and charge separation, as evidenced by increased photocurrent, reduced photoluminescence intensity, and shorter time-resolved photoluminescence (TRPL) decay. Furthermore, the catalyst exhibited excellent stability over multiple cycles, demonstrating strong potential for practical wastewater treatment applications. Mechanistic studies revealed that ·O 2 − and 1 O 2 were the dominant reactive species involved in the degradation process.
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CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Xiao-Yu Lang,Guo-Hua Zhang
Mo 2 FeB 2 powders with different Mo/B atomic ratios (0.9, 1.0, 1.1) were first prepared under vacuum condition using different-sized Mo powder, as well as FeB and B 4 C powders as raw materials. Based on the prepared Mo 2 FeB 2 powders, Mo 2 FeB 2 -based cermets were synthesized at different sintering temperatures. Results indicated the morphology of the hard phase was closely related to the Mo/B atomic ratio. As the Mo/B atomic ratio increased, the degree of anisotropy of the hard phase decreased significantly, and its grain morphology gradually evolved from elongated to nearly equiaxed shape. When the sintering temperature was 1200 °C, the incomplete diffusion of the liquid phase led to the occurrence of “liquid-filled lakes” in some samples, while this phenomenon became weakened after the temperature was increased. The microstructure uniformity was optimal when Mo/B = 0.9, with the hardness of 1227 HV 30 ; while the fracture toughness and transverse fracture strength were optimal when Mo/B = 1.1, reaching 23.8 MPa m 1/2 and 2125.9 MPa, respectively. Annealing twins were observed in the γ-Fe binder phase of sample D, which effectively improved the fracture toughness of the cermet by altering the crystallographic orientation of the binder phase. The cermets prepared from ultrafine Mo powders exhibited better mechanical properties due to grain refinement and low porosity.
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JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
·
2025
·Vol. 105
·期 7
·3931-3941
·
IF 3.5
Jiawei Zheng,Qiangyue Zhang,Nanjing Zhong
BACKGROUND Immobilized enzyme possessing both high activity and good selectivity is important in practice. In this study, Candida antarctica lipase B (CALB) was immobilized onto the macroporous resin ADS-17 for triacylglycerol (TAG) synthesis through esterification of oleic acid and glycerol. The reaction conditions were optimized by single-factor study and orthogonal test, and the reusability of the immobilized CALB (CALB@ADS-17) was evaluated. In addition, the mechanism of lipase immobilization was studied and the catalytic mechanism of CALB@ADS-17 was investigated. RESULTS Oleic acid conversion up to 99.20% and TAG content at 91.58 wt% could be obtained under optimal conditions. In addition, the CALB@ADS-17 retained 84.28% of its initial activity after 11 cycles of reuse. The mechanism of lipase immobilization was through hydrophobic adsorption. The relationship between temperature and oleic acid conversion was ln V 0 = 6.3316 − 4.3321/ T , and the activation energy ( E a ) was 36.02 kJ mol −1 . CALB@ADS-17 did not exhibit an obvious interfacial activation phenomenon. Its kinetic behavior can be described by the Michaelis–Menten model, whose kinetic parameters of v max , k cat , K m , K i , and k ca t /K m were 0.01265 μmol L −1 s −1 , 9310.72 s −1 , 0.4907 mmol L −1 , 3.997 mmol L −1 , and 1.90 × 10 4 L mmol −1 s −1 , respectively. CONCLUSION CALB@ADS-17 showed good esterification performance and exhibited good selectivity towards TAG generation. In addition, CALB@ADS-17 exhibited good reusability in esterification reactions and has potential in practical applications. © 2025 Society of Chemical Industry.
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Journal of Zhejiang University-SCIENCE A
·
2015
·Vol. 16
·期 8
·669-679
·
IF 0.882
Shan Jie,Wang Li,Yu Hao-jie,Tai Yu-lei,Akram Muhammad
Porous polymers are very suitable materials for the adsorption of organic pollutants due to their abundant pores and organic frameworks in aqueous solution. However, their recovery from treated pollutant is difficult, and thus, their application is limited. A facile strategy to synthesize reusable magnetic porous microspheres (MPMS) of Fe 3 O 4 /poly(methylmethacrylate (MMA)- co -divinylbenzene (DVB)) is described in this paper. The magnetic microspheres were synthesized by suspension copolymerization. MMA was used as a monomer, DVB was used as a crosslinker, and the magnetic fluid was added to the organic phase. The morphology of MPMS was observed by scanning electron microscope (SEM) and other properties were tested by superconducting quantum interference device, Fourier transform infrared (FT-IR) spectroscopy, thermogravimetric analysis (TGA), X-ray powder diffraction (XRD), and nitrogen sorption-desorption techniques. The synthesized MPMS possessed a high specific surface area using toluene as a porogen. It was further found that the ratio of DVB to MMA, the ratio of porogen to monomer, and the type of porogen all affected the specific surface area and the morphology of the microspheres. Furthermore, the microspheres were applied to remove Rhodamine B from its aqueous solution. The results showed that the microspheres possessed good adsorption capacity for Rhodamine B. This result was due to the porous structure, polar groups, and superparamagnetic characteristic of the synthesized microspheres.
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Journal of Materials Chemistry C
·
2021
·Vol. 9
·期 30
·9692-9701
·
IF 7.393
Jingwei Liu,Yanjie Liang,Shao Yan,Dongxun Chen,Shihai Miao,Weili Wang,Jianqiang Bi
Ultraviolet (UV) luminescent materials hold great promise for applications across a wide range of fields, such as environmental, biological and medical fields. However, luminescent materials with the capability to continuously emit UV light for minutes or hours after ceasing the excitation are relatively lacking, although such phosphors are highly desired for some new important applications. Here, we report a series of Bi3+-doped garnet persistent phosphors that exhibit strong ultraviolet-B (UVB) persistent luminescence peaking at ∼313 nm and a long persistence time of more than 60 h. Remarkably, these persistent phosphors can be repeatedly charged by natural sunlight under any weather conditions, at any moment between sunrise and sunset during the day, and in various aqueous media. Minutes of natural sunlight irradiation can result in hours (>12 h) of persistent UVB light emission. Benefitting from the exceptional self-sustained UVB luminescence performance, and an optical signal outside of the visual spectrum, together with the avoidance of interference from ambient light, these materials show high promise for covert optical tagging applications. More importantly, the UVB persistent luminescence under the excitation of natural sunlight found in this study is expected to inspire the discovery of more excellent sunlight-activated UV persistent phosphors.
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ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Mengfei Zhu,Yuepeng Pang,Fuqiang Lu,Xinxin Shi,Junhe Yang,Shiyou Zheng
Li–B–H complexes facilely prepared via partial dehydrogenation of LiBH4 are presented in this study as solid electrolytes for Li batteries. An exceptionally high Li-ion conductivity is found for the Li–B–H complex with 7.5 wt % H2 desorption under 3 bar H2 pressure, which reaches 2.7 × 10–4 S cm–1 at 35 °C, more than 4 orders higher than that of LiBH4. In-depth characterizations show that LiH and [Li2B12H11+1/n]n are in situ formed in the LiBH4 matrix and the interface layer between [Li2B12H11+1/n]n and LiBH4 is believed to be responsible for the high Li-ion conductivity. Moreover, this Li–B–H complex also exhibits excellent electrochemical stability, which enables the stable cycling of all-solid-state batteries at room temperature.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2019
·
IF 3.131
Xiaotong Sun,Luting Yan,Runxiang Xu,Mingyuan Xu,Yanyun Zhu
TiO 2 presents a broad application prospect in the field of degradation of environmental pollutants. However, the development of TiO 2 photocatalyst has been limited by two factors, namely, narrow spectral response range and low quantum efficiency . Surface coating can selectively change the physical and chemical properties of core particles, whereas the synergistic action between core and shell can optimize material performance. In this paper, surface modification of titanium dioxide (TiO 2 ) by dopamine polymerization was used to improve its photocatalytic performance. Among polydopamine (PDA)-modified TiO 2 , TiO 2 @PDA-0.4 mg/mL-2 h showed the best degradation rate of Rhodamine B (RhB): the degradation rate reached 99.28% and 77.40% after 1.5 h of ultraviolet–visible (UV–vis) and visible (Vis) light irradiation, respectively. Compared with the uncoated TiO 2 , the degradation rate has shown improvement, especially under Vis light irradiation, with the photocatalytic performance improving by 35.04%. Absorption, emission, and impedance spectra showed that surface modification of TiO 2 with suitable thickness of PDA effectively increased light absorption and promoted separation of photogenerated carriers . High-performance liquid chromatography–mass spectrometry revealed the differences in photocatalytic degradation mechanism of TiO 2 @PDA to RhB under UV–vis and Vis light irradiation. Compared with those under UV–vis light irradiation, the intermediate products under Vis light irradiation are relatively simple. TiO 2 @PDA generated more electrons, which interacted with H 2 O to produce large amounts of ·OH and holes under UV–vis light irradiation in comparison with that under Vis light irradiation. In addition to deacetylation , deamination , and decarboxylation by hydroxylation , excess ·OH in the photocatalytic process would attack benzene rings directly to produce N , N -diethylacetamide.
研究领域:
材料科学
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环境化学
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光催化
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纳米材料
·
表面工程
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Nanoscale
·
2026
·
IF 5.2
Lin Tian,Wenjing Cheng,Chunmei Ni,Xuena Gao,Jianguo Dong,Huimin Yang,Ju Wang,Wenyi Tan,Zhao Li
Developing efficient and stable electrocatalysts for the oxygen evolution reaction (OER) is essential for alkaline water electrolysis. Herein, ruthenium-doped cobalt phosphide encapsulated in open hollow nanoboxes of boron-nitrogen-codoped carbon (Ru-CoP/BNC-1) was successfully synthesized via a three-step strategy. Structural characterization revealed that the synergistic effect between Ru and boron- nitrogen-codoped carbon quantum dots (BCQDs) facilitated the selective etching of the ZIF-67 precursor, leading to a unique nanostructure with abundant lattice distortions and a high specific surface area after phosphidation. X-ray photoelectron spectroscopy (XPS) and in situ Raman spectroscopy confirmed that Ru doping effectively modulates the electronic structure of Co, promoting the formation of high-valent cobalt species, while B doping facilitates surface reconstruction via interfacial effects and leaching during OER, thereby optimizing the reaction pathway. Electrochemical measurements demonstrated that the catalyst delivers outstanding OER performance under alkaline conditions, requiring an overpotential of only 227 mV at 10 mA cm-2 and a Tafel slope of 80.01 mV dec-1, outperforming most reported cobalt-based catalysts and even commercial RuO2. Moreover, the catalyst exhibited excellent stability, showing negligible decay after 117 h of continuous operation at 50 mA cm-2. Density functional theory (DFT) calculations further revealed that the co-doping of Ru and B synergistically reduces the free-energy barrier for the *O-to-*OOH step, improving the reaction kinetics. This work provides a novel strategy for designing high-performance cobalt-based electrocatalysts through multi-element synergy.
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