POLYMER DEGRADATION AND STABILITY
·
2025
·
IF 7.4
Jia-Xiang Yang,Ying-Jun Xu,Ya-Wei Zheng,Wan-Meng Song,Yun Liu
Ramie fiber-reinforced epoxy composites have high mechanical strength and outstanding corrosion resistance, and are widely used in many fields. However, ramie fiber and epoxy resin are inherently flammable, and there is an increasing focus on the flame-retardant improvement of Ramie fiber-reinforced epoxy (EP/RF) composites. In this study, an eco-friendly and higher efficient P-N-B flame retardant (denoted as DBC) was synthesized and subsequently applied to ramie fabric to impart flame retardancy of EP/RF composites. When the weight gain on ramie fabric was about 10 wt%, the limiting oxygen index of EP/RF-DBC is 32.6%, and EP/RF-DBC has been upgraded from UL-94 No rating to UL-94 V-0 rating. Compared with EP/RF, the peak heat release rate and total heat release of EP/RF-DBC reduced by 31.9% and 32.0%, respectively, indicating that the introduction of DBC reduces the fire hazard of EP/RF. The presence of DBC promotes the dehydration of EP/RF into residual chars, which act as a barrier to block the exchange of heat and gas, releasing more noncombustible gases and diluting the concentration of combustible gases. In terms of mechanical properties, due to the low acidity of DBC and the presence of many amino groups in chitosan oligosaccharide, the adhesion between RF and EP is improved. The flexural strength and modulus of EP/RF-DBC are increased by 15.3% and 32.1%, respectively, compared with EP/RF.
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高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Guilong Yan,Xinrong Zhou,Shijie Ding,Yuzhen Zhou,Jianguo Wu,Ci Jin,Wei Wang
A countercurrent pretreatment strategy using p -toluenesulfonic acid (TsOH) was developed to improve the fractionation and enzymatic hydrolysis of corncob. Four pretreatment solvents were evaluated, and 50 % TsOH with three countercurrent pretreatment cycles showed the highest efficiency. After pretreatment, the cellulose content of the pretreated corncob increased to 76.7 %, and the removal of hemicellulose, acid-soluble lignin (ASL) and acid-insoluble lignin (AIL) was 88.1 %, 63.8 %, and 90.9 %, respectively. Subsequent enzymatic hydrolysis yielded an enzymatic digestibility of 79.1 % and a glucose recovery of 76.4 %. Structural analyses by SEM, XRD, and FTIR confirmed biomass deconstruction and cellulose enrichment. HSQC NMR analysis demonstrated that the recovered lignin was enriched in H-type units, suggesting promising potential for high-value valorization. This mild and effective TsOH countercurrent pretreatment provides a sustainable approach for lignocellulosic biorefining with strong prospects for industrial application.
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PubMed
高影响因子
Inorganics
·
2025
·Vol. 13
·期 12
·402
·
IF 3
Xiangqi Lu,Hongbo Chen,Yufei Gu,Jun-Liang Chen,Jie Gao,Kun Hu,Weijiang Gan,Zhongmin Wang,Huajun Lai,Lei Miao
Silicon-based thermoelectric (TE) materials are demonstrating advanced capacity in environmental waste heat recovery. However, intrinsically high lattice thermal conductivity hinders the improvement of TE conversion efficiency. In the present work, a study of B4C composite for in situ nano-inclusions was carried out to enhance the TE properties of p-type Si80Ge20materials. During sintering, B4C was demonstrated to form the SiC and B-rich ternary with a SiGe-based matrix, and the in situ formation of diverse nano-inclusions and the B dopant significantly reduced lattice thermal conductivity without deteriorating power factor (PF), weakening the coupling relationship between thermal and electrical transport properties to a certain extent. The carrier concentration of SiGe alloy samples was significantly increased, resulting in a 7.8% enhancement ofPFfor Si80Ge20B0.5-(B4C)0.3at 873 K, while a low lattice thermal conductivity of 0.69 W m−1K−1is achieved. The optimalZTis 1.08, which increased ~50% compared to the pristine sample, and an excellent averageZTavgof 0.62 is obtained among recent p-type SiGe-based TE materials’ works. Our research provides a new perspective for the optimization and practical application of p-type silicon germanium TE materials.
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高影响因子
Advanced Electronic Materials
·
2023
·Vol. 9
·期 4
·2201084
·
IF 6.2
Chuanyang Cai,Hong Zhang,Bo Li,Zhijia Han,Fang Wang,Pengfei Hou,Weishu Liu
Organic pyroelectric materials are widely applied as temperature sensors in wearable electronic devices due to their good biocompatibility and stability. Real-time monitoring of the physiological state of the human body requires pyroelectric materials with a fast response time and large output voltage. In this study, the pyroelectric characteristics of poly(vinylidene fluoride–trifluoroethylene) (P(VDF–TrFE)) films are improved with the use of commercial inorganic P-type bismuth antimonide (P-Bi 2 Te 3 ) fillers. Composite films with 0.2 wt% P-Bi 2 Te 3 increase the pyroelectric response time and voltage by improving the thermal diffusivity and enhancing the β-phase content, respectively. Proton irradiation results in further improvement of the pyroelectric response time from 22 to 0.5 s. The proton irradiation-induced ionization energy loss improves the conductivity of the composite films, thereby enhancing the pyroelectric response time. These results show that P-Bi 2 Te 3 doping is beneficial for improving the pyroelectric properties of P(VDF–TrFE) and that proton irradiation is an effective method for further improving the response time of inorganic–organic composite films.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2015
·
IF 5.056
Yue Cui,Zhi-Kan Yao,Ke Zheng,Shi-Yuan Du,Bao-Ku Zhu,Li-Ping Zhu,Chun-Hui Du
To explore low-pressure-driven nanofiltration (LPDNF) membranes with high permeate flux , a novel preparation route was proposed and investigated. First, an amphiphilic copolymer of poly (methyl methacrylate- co -dimethylaminoethyl methacrylate) (P(MMA- co -DMA)) was synthesized via free-radical copolymerization , and then blended with polyvinyl chloride (PVC) to fabricate precursor membranes via non-solvent induced phase separation (NIPS) process. Utilizing the quaternization and cross-linking reaction between p -xylylene dichloride (XDC) and tertiary amine units in PVC/PMMA- co -DMA precursor membranes, positively charged PVC/PMMA- co -DMA LPDNF membranes were obtained. Element alanalysis, X-ray photoelectron spectroscopy and scanning electron microscopy were employed to characterize the composition and morphology of the membranes. Effects of PMMA- co -DMA content and XDC concentration on the LPDNF membranes’ performance were studied and discussed. With the optimized condition, the NF membrane showed the highest salt rejection ( R ) and water flux ( J ), e.g., R MgCl 2 =89.1%, J MgCl 2 =22.1 L/(m 2 h) and R NaCl =45.1%, J NaCl =27.6 L/(m 2 h) at a pressure of 0.3 MPa. Besides, the rejections of the LPDNF membranes for inorganic salts increased in an order of Na 2 SO 4
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高影响因子
Nano Energy
·
2019
·
IF 15.548
Yang Gao,Zhichang Xiao,Debin Kong,Rashid Iqbal,Quan-Hong Yang,Linjie Zhi
Carbon-based metal-free electrocatalysts have inspired extensive efforts to explore their applications in many nontrivial electrochemical reactions , such as oxygen reduction reaction (ORR), oxygen evolution reaction (OER), and hydrogen evolution reaction (HER), by virtue of the integrated advantages including low cost, sustainability , longevity, and multifunctionality . Herein, N,P co-doped hollow carbon nanofiber ( N ,P–HCNF) membranes were facilely prepared via coaxial electrospinning technology, which are bestowed with a hierarchical porous architecture, turbostratic structures, and abundant catalytically active sites such as doping, defects, and edges. Benefiting from structural features of the one-dimensional (1D) carbon hollow nanoarchitecture, which affords plentiful active sites, continuous conducting pathways, and benign mass transfer channels, the resultant catalyst reveals an excellent trifunctional electrocatalytic activity for ORR, OER, and HER. Impressively, it exhibits one of the best metal-free bifunctional electrocatalytic activities in oxygen electrocatalysis as characterized by a low potential deviation (Δ E ) of 0.73 V between the half-wave potential ( E 1/2 ) for ORR and the potential reaching 10 mA cm −2 ( E j=10 ) for OER. Significantly, further investigations demonstrate that the effect of mass transfer makes a great difference to electrocatalytic activity , mainly through enlarged specific surface area to affect intrinsic catalytic activity and the ionic resistance in pores. This work sheds light on the design, fabrication, and regulation of highly active metal-free electrocatalysts with abundant active sites and tuned pore structures for electrocatalysis and other applications.
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高影响因子
Journal of Materials Chemistry A
·
2025
·Vol. 13
·期 47
·41354-41364
·
IF 9.5
Shaoyan Zhang,Bing Xie,Haishan Xu,Jinqiao Yi,Kun Guo,Haibo Zhang,Tianyu Li
Polymer film capacitors are vital for power electronic systems due to their ultrafast charge–discharge capability, high power density, mechanical flexibility, and lightweight nature. However, achieving both high discharge energy density (Ud) and high energy-storage efficiency (η) in polymer dielectrics remains a major challenge due to the intrinsic trade-off between permittivity, electric polarization, and breakdown strength. In this study, we have designed bilayer heterogeneous nanocomposites (BHNs) that integrate a linear polyimide (PI) layer—offering low dielectric loss and high breakdown strength—with a ferroelectric P(VDF-CTFE) matrix embedded with dopamine-modified BaTiO3 nanowires (dopa@BT NWs), which imparts high polarization. By precisely tuning the thickness of each layer and the interfacial charge accumulation, we activate synergistic interfacial polarization and a breakdown hindrance effect. More importantly, we propose the concept of a “threshold concentration of interfacial space charge”, which governs the critical charge density required to maximize performance without triggering dielectric instability. As a result, the optimized BHNs (0.3 vol% dopa@BT NWs/P(VDF-CTFE)-PI, whose thicknesses are 4 µm and 8 µm, respectively) exhibit a significantly enhanced Ud of up to 11.1–14.1 J cm−3 and a high η of 72–86%, substantially surpassing conventional single-layer configurations. This work not only delivers promising candidates for advanced dielectric energy-storage applications but also introduces a physically grounded design model that offers guidance for next-generation high-performance polymer-based capacitors.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yaxin Ru,Yajie Chen,Xinyan Yu,Qiuyu Zhang,Yuejia Yin,Guohui Tian
Hollow heterostructured catalysts have been widely investigated and applied in photocatalytic organic reactions. However, achieving hybrid catalysts with optimized hollow structure and controllable components is still a challenge. Herein, Cu-BTC@CuS@CeO 2 ternary heterostructure hollow octahedrons were designed and prepared using a copper-based metal–organic framework (Cu-BTC) as both copper source and template. A thin CeO 2 nanolayer was first formed and covered on the prepared Cu-BTC octahedron surface through a hydrothermal process. In the meanwhile, the Cu-BTC octahedrons were controllably etched in this hydrothermal process, leading to the formation of Cu-BTC@CeO 2 hollow octahedron. The following sulfidation reaction produced Cu-BTC@CuS@CeO 2 double p-n heterojunction hollow octahedrons. Benefiting from the novel hollow octahedron double p-n heterojunctions, excellent visible-near infrared light absorption, and fast charge transfer and separation, the obtained Cu-BTC@CuS@CeO 2 hollow octahedron hybrid catalyst exhibited a significantly higher photocatalytic activity toward the oxidative coupling of amines to imines at room temperature under visible-near infrared light irradiation compared to the control single component catalysts (Cu-BTC, CeO 2 , and CuS) and binary hybrid catalysts (Cu-BTC@CeO 2 , Cu-BTC@CuS, and CuS@CeO 2 ). The enhanced charge transfer at the double p-n heterojunction was discussed. Meanwhile, the photocatalytic oxidation products and reaction mechanism were investigated by surface-enhanced Raman spectroscopy, gas chromatography-mass spectrometry, and pyridine adsorption FT-IR spectroscopy. This work presents a promising strategy for the design of multi-component hollow heterostructure catalysts.
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高影响因子
JOURNAL OF POWER SOURCES
·
2026
·
IF 8.4
Zixuan Deng,Shuang Zhang,Fudong Li,Yue Zhu,Changsheng Shan,Yuanmeng Zhao
Rationally designing electrocatalyst/electrolyte interfaces with excellent active hydrogen supply capability is crucial for the hydrogen evolution reaction (HER), a core step in alkaline anion exchange membrane water electrolysis (AEMWE). Herein, phosphorus (P)-surface-coordinated PtFeCoCuMo quinary alloys are synthesized via a two-step wet-chemical method. P-induced d-p orbital hybridization enables the synergistic regulation of two key factors: it optimizes the hydrogen adsorption free energy (ΔG H∗ ) and water dissociation barrier (thermodynamic modulation), while tailoring the potential of zero charge (PZC) to accelerate proton transport (kinetic modulation). The optimized P 16 -PtFeCoCuMo catalyst exhibits outstanding alkaline HER activity, with a turnover frequency (TOF) 5-fold and 3-fold higher than those of commercial Pt/C and pristine PtFeCoCuMo alloy, respectively. This work overcomes thermodynamic and kinetic limitations simultaneously through heteroatom doping, providing a promising strategy for the design of high-performance alkaline HER catalysts.
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高影响因子
NEW JOURNAL OF CHEMISTRY
·
2026
·
IF 2.6
Yuzuo Liu,Jiawei Li,Bin Li,Zhigang Hu,Haoyu Lv,Ying Wang
In this work, nitrogen-doped carbon quantum dots (N-CQDs) were successfully synthesized via a microwave-assisted route using citric acid and o-phenylenediamine as precursors. A deep eutectic solvent was subsequently constructed using choline chloride as the hydrogen bond acceptor and glycerol/acrylamide as hydrogen bond donors. The N-CQDs were introduced as functional nanofillers, and a P(AM-Gly-ChCl)/N-CQDs composite hydrogel was obtained through photopolymerization. The chemical composition and microstructure of the composite hydrogel were systematically characterized by SEM, XPS, and FTIR, verifying the effective incorporation of N-CQDs into the hydrogel network. The effect of N-CQDs content on the mechanical, sensing, and adsorption properties of the hydrogel was elucidated. With increasing N-CQDs content, both tensile fracture stress and tear energy were substantially improved. The composite hydrogel exhibited an enhanced pressure-sensitive response, with a relative capacitance change of 137.0% achieved at an applied load of 1 N for the hydrogel containing 0.3 wt% N-CQDs. In addition, incorporation of N-CQDs endowed the hydrogel with effective Fe3+ adsorption capability and pronounced fluorescence quenching behavior, highlighting its potential for multifunctional applications that integrate pressure sensing and metal-ion detection.
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高影响因子
Journal of Environmental Chemical Engineering
·
2026
·Vol. 14
·期 2
·121778
·
IF 7.5
Jian-Bo Qu,Guo-Yu Yue,Jian-Ling Zhang,Yuan Yang,Dong Wang,Jia-Le An,Jing Li
The excellent catalytic performance of noble metal nanoparticles (NMNPs) is often hampered by their tendency to agglomerate and poor recyclability, which significantly limits their large-scale industrial use. To address these challenges, anchoring NMNPs onto porous supports has been proposed as an effective strategy, as it not only suppresses their migration and agglomeration but also enhances their catalytic stability and recyclability through strong metal–support interactions. In this study, novel poly (glycidyl methacrylate) @ZIF-8@Au (PGMA@ZIF-8@Au) composite microspheres were fabricated via three steps: gigaporous PGMA microspheres were first prepared via suspension polymerization, followed by the in-situ growth and subsequent etching of ZIF-8 on their surface, and finally, the confined loading of gold nanoparticles (AuNPs) with three different sizes. This designed structure effectively mitigates issues such as nanoparticle aggregation, detachment, and mass transfer limitations. The hierarchical pores of the PGMA microspheres provide a high specific surface area and abundant active sites, while the rich epoxy rings create an electron-rich environment that facilitates electron transfer to the AuNPs. Moreover, ZIF-8 improves the structural stability and biocompatibility of the composite microspheres and promotes the uniform dispersion of AuNPs. The resulting catalyst achieved 100 % degradation of p-nitrophenol (PNP) within 20 min and maintained a conversion of 84.8 % after ten consecutive cycles. Based on the synergistic effects between the composite and the AuNPs, a plausible catalytic mechanism was proposed. This work offers a promising strategy for designing highly efficient catalysts for environmental remediation.
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高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2018
·Vol. 28
·期 15
·1706403
·
IF 13.325
Jiaqi Cheng,Hong Zhang,Yong Zhao,Jian Mao,Can Li,Shaoqing Zhang,Kam Sing Wong,Jianhui Hou,Wallace C. H. Choy
Hole transport layer (HTL) plays a critical role for achieving high performance solution-processed optoelectronics including organic electronics. For organic solar cells (OSCs), the inverted structure has been widely adopted to achieve prolonged stability. However, there are limited studies of p-type effective HTL on top of the organic active layer (hereafter named as top HTL) for inverted OSCs. Currently, p-type top HTLs are mainly 2D materials, which have an intrinsic vertical conduction limitation and are too thin to function as practical HTL for large area optoelectronic applications. In the present study, a novel self-assembled quasi-3D nanocomposite is demonstrated as a p-type top HTL. Remarkably, the novel HTL achieves ≈15 times enhanced conductivity and ≈16 times extended thickness compared to the 2D counterpart. By applying this novel HTL in inverted OSCs covering fullerene and non-fullerene systems, device performance is significantly improved. The champion power conversion efficiency reaches 12.13%, which is the highest reported performance of solution processed HTL based inverted OSCs. Furthermore, the stability of OSCs is dramatically enhanced compared with conventional devices. The work contributes to not only evolving the highly stable and large scale OSCs for practical applications but also diversifying the strategies to improve device performance.
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高影响因子
危险品化学品经营许可证（带存储）