POLYMER ENGINEERING AND SCIENCE
·
2025
·
IF 3.2
Hongqing Zhu,Jiahao Duan,Houwang Wang,Linhao Xie,Xiaodong Qian,Mei Wan
A bio-based phytate (PA)-intercalated Mg-Al layered double hydroxide (LDH-PA) was successfully synthesized via a calcination-reconstruction method and incorporated into polypropylene (PP) as an efficient flame retardant. LDH-C precursors were first prepared by co-precipitation combined with hydrothermal treatment, followed by calcination at 500°C to obtain layered double oxides (LDO). Subsequent anion exchange with phytate under a nitrogen atmosphere reconstructed the LDH structure, introducing PA anions into the interlayer. The results from multiple characterization techniques confirmed the successful incorporation of phytate anions. The PP/LDH-PA composites exhibited markedly enhanced thermal stability. At a loading of 15 wt% LDH-PA, the maximum thermal decomposition rate decreased by 19.0%, and the residual char yield increased to 12.72 wt%. The composite achieved a limiting oxygen index (LOI) of 26.8% and attained a UL-94 V-1 rating. Cone calorimeter tests showed that, compared with pure PP, the PP/LDH-PA 15 composite reduced the peak heat release rate (PHRR), total heat release (THR), peak smoke production rate (PSPR), total smoke release (TSR), peak CO release rate, and peak CO 2 release rate by 29.6%, 19.2%, 41.2%, 13.4%, 35.3%, and 32.4%, respectively. These enhancements can be mainly ascribed to three factors: (i) the compact char layer catalyzed by LDH-PA offers a physical barrier effect; (ii) during the LDH decomposition, the carbon dioxide and crystalline water released generate a dilution effect; (iii) PA brings about a radical-quenching mechanism.
研究领域:
材料科学
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高分子科学
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消防安全工程
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纳米技术
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2025
·
IF 2.8
Yilin Li,Jinsheng Duan,Zhaogang Liu,Feng Guo,Peijie Jia,Junchang Fan,Shuxin Wu,Yanhong Hu,Jinxiu Wu,Xiaowei Zhang,Jianfei Li
To address the thermal instability of polyvinyl chloride (PVC) and the environmental risks of conventional stabilizers, cyanurate-intercalated layered double hydroxides (LDHs), including MgAl-LDH (MA), La-doped MgAl-LDH (MAL), and Ca/La-doped MgAl-LDH (CMAL), were synthesized. Comprehensive XRD, FTIR, TGA, and SEM characterization confirmed the structural integrity of the samples. These LDHs were incorporated into PVC to fabricate composite materials, whose thermal stabilization efficiency was systematically evaluated through accelerated aging, Congo red, and dynamic thermal stability tests. Thermogravimetric analysis revealed that CMAL/PVC exhibited the highest initial decomposition temperature (281°C), surpassing MA/PVC (270°C), MAL/PVC (274°C), and neat PVC (256°C). Consistent enhancements were observed in color retention and HCl scavenging capacity, which correlated with increased thermal degradation resistance. Mechanistic studies demonstrated that cyanuric acid-modified LDHs effectively suppressed autocatalytic HCl elimination and conjugated polyene formation during the thermal aging process at 180°C and the HCl absorption experiment. The multimetal synergy in CMAL enhanced Cl − coordination and acid neutralization, thereby inhibiting PVC degradation cascades. This work provides fundamental insights into designing eco-friendly LDH-based thermal stabilizers for high-performance PVC applications, demonstrating significant potential for sustainable polymer engineering.
研究领域:
材料科学
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高分子科学
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环境科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Minerals Metallurgy and Materials
·
2024
·Vol. 32
·期 2
·450-463
·
IF 5.6
Zhang Wenxi,Zhuo Zhangzelong,Xu Dan,Wu Liang,Xie Zhihui
We have developed a superhydrophobic and corrosion-resistant LDH-W/PFDTMS composite coating on the surface of Mg alloy. This composite comprised a tungstate-intercalated (LDH-W) underlayer that was grown at low temperature (relative to hydrothermal reaction conditions) under atmospheric pressure and an outer polysiloxane layer created from a solution containing perfluorodecyltrimethoxysilane (PFDTMS) using a simple immersion method. The successful intercalation of tungstate into the LDH phase and the following formation of the polysiloxane layer were confirmed through X-ray diffraction (XRD), Fourier transform infrared (FTIR) spectroscopy, and X-ray photoelectron spectroscopy (XPS). The corrosion resistance of the LDH-W film, both before and after the PFDTMS modification, was evaluated using electrochemical impedance spectroscopy (EIS), Tafel curves, and immersion experiments. The results showed that Mg coated with LDH-W/PFDTMS exhibited significantly enhanced corrosion protection compared to the unmodified LDH-W film, with no apparent signs of corrosion after exposure to 3.5wt% NaCl solution for 15 d. Furthermore, the LDH-W/PFDTMS coating demonstrated superior superhydrophobicity and self-cleaning properties against water and several common beverages, as confirmed by static contact angle and water-repellency tests. These results offer valuable insights into preparing superhydrophobic and corrosion-resistant LDH-based composite coatings on Mg alloy surfaces under relatively mild reaction conditions.
研究领域:
材料科学
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腐蚀与防护
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Shunxiang Wang,Sen Hu,Cuili Xiang,Yongjin Zou,Fen Xu,Ningbo Qin,Lixian Sun
Pt/C is currently widely utilized as a catalyst for electrolytic hydrogen production. However, the high cost of Pt-based catalysts limits further development. Therefore, developing an efficient, highly stable, and cost-effective catalyst is crucial. In this study, we enhanced the ability to activate H 2 O and the performance of the hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) by incorporating a small amount of Ru into NiFeAl-layered double hydroxides (LDHs), thereby altering the electrochemical active surface area and the catalysts’ internal resistance. The catalyst demonstrated excellent catalytic activity in alkaline electrolytes, achieving low overpotentials of 33 mV at 10 mA cm −2 and 278 mV at 50 mA cm −2 . Furthermore, it demonstrated outstanding stability for up to 240 h; the catalyst was successfully assembled into a solar-powered hydrogen production system via full-water-splitting testing, thus providing more possibilities for electrolytic hydrogen production.
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2022
·
IF 9.136
Xun Li,Ziying Yuan,Zhiling Huang,Aoki Koso,Jinhua Li,Bo Xie,Zheming Ni,Shengjie Xia
Z − scheme heterojunctions can increase the electron transfer rate, inhibit the recombination of electrons and holes, and enable the material to possess a more vital redox ability. In this work, In 2 O 3 @ZnCr − LDHs Z − scheme heterojunction was fabricated by complexing ZnCr layered double hydroxides (LDHs) nanosheets on ho llow In 2 O 3 nanorods and used for photocatalytic degradation of tetracycline (TC), a typical antibiotic. Under the optimal conditions of 0.6 g/L In 2 O 3 @ZnCr − LDHs, pH of 9, and reaction temperature of 40 °C, it takes 150 min for the degradation rate of TC to reach 87 %. With the addition of persulphate (PS) to form advanced oxidation processes (AOPs), the TC removal rate reached 83 % within 45 mins, and improvement was evident. When adding persulfate (PS) to form advanced oxidation processes (AOPs), the removal of TC reached 83 % within 45 min, and the improvement effect was pronounced. XPS, ESR, photoelectric performance test and DFT calculations show that the excellent photocatalytic activity is attributed to the built-in electric field in the direct Z − scheme heterojunction, which can boost the transfer of photogenerated carriers and reduce the recombination of electron-hole pairs. In addition, the heterojunction can photo-activate PS to generate more oxidative sulfate radicals , which has a synergistic effect with hydroxyl radical and superoxide radical to degrade TC. Therefore, the Z − scheme/PS − AOPs system has a potential application in antibiotic contaminant degradation.
研究领域:
环境科学
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材料化学
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光催化
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水处理技术
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抗生素降解
✓ 已验证
DOI
高影响因子
ChemCatChem
·
2020
·Vol. 12
·期 24
·6401-6409
·
IF 4.853
Yuhang Du,Yufei Lu,Hongjian Zhang,Zhentao Nie,Zhicheng Sun,Congying Han,Ruizi Li,Jixin Zhu
Graphical Hierarchical benefits : A three-dimensional hierarchical arrays structure assembled from nanosheets based on nickel foam was obtained by a simple soft chemical synthesis method. The composite was employed as the electrode of water splitting device to generate hydrogen and exhibited favorable hydrogen evolution efficiency, which benefits from the novel structural design and the synergistic effect of two components of Ni 3 S 2 and LDHs in the hydrogen evolution reaction. Designing an electrocatalyst with optimized structure and performance is vital for the electrolysis of water to produce hydrogen. Herein, a three-dimensional (3D) hierarchical composite electrode material is proposed for alkaline hydrogen evolution reaction (HER), consisting of Co−Al hydroxides (CoAl-LDHs) nanosheets decorated with vertically aligned nickel sulfide (Ni 3 S 2 ) arrays (Ni 3 S 2 @CoAl-LDHs/NF). The as-obtained electrocatalyst displays a minimum overpotential of 175 mV at 10 mA cm −2 toward HER. Electrochemical impedance spectroscopy and Tafel slope further reveals outstanding kinetics in the electrolysis process. The catalytic performance of the electrode can still maintain 90 % capacity after 1000 CV cycles. The outstanding properties of the composite material benefits from its unique 3D hierarchical structure, which promote plentiful active sites and faster electronic transfer rate. This work sheds lights on the current research of noble-metal-free electrocatalysts and the design of overall water splitting.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
Inorganic Chemistry Frontiers
·
2022
·Vol. 10
·期 3
·869-879
·
IF 7.779
Senda Su,Xiaoman Li,Mengyao Tan,Xu Zhang,Yingying Wang,Yanzhong Duan,Juan Peng,Min Luo
Layered double hydroxides (LDHs) have been shown to be efficient photocatalysts for the nitrogen fixation reaction. However, the effect of interlayer anions on the catalytic performance has not yet been reported. Herein, the anion regulated channel of LDHs blocked by carbonate (Car) was opened by controlling the suberate (Sub) intercalation, thus obtaining a series of ZnAl-LDHs with different anions (carbonate, suberate, PMo12−XVX, X = 0, 1, 2, 3, 8). The photocatalytic performance test in pure water showed that Sub@ZnAl-LDH and PMo9V3@ZnAl-LDH improved the NH3 yield from 11.37 μmol h−1 g−1cat for Car@ZnAl-LDH to 48.91 μmol h−1 g−1cat and 89.16 μmol h−1 g−1cat, respectively. The improvement of the performance was attributed to the following: (1) nitrogen was allowed to enter between LDH layers due to the expansion of the interlayer spacing; (2) the hydrophobic suberic acid intercalation suppressed the hydrogen evolution reaction; (3) the POM intercalation broadened the light absorption range of LDH. In this paper, the photocatalytic properties of ZnAl-LDHs intercalated with different anions are explored and investigated for the first time, which provides a versatile strategy for enhancing the catalytic activity of LDHs in the photocatalytic nitrogen fixation reaction.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
DALTON TRANSACTIONS
·
2017
·Vol. 46
·期 22
·7284-7290
·
IF 4.029
Mingzhe Li,Yanyan Fu,Lan Jin
It is of great significance to sense cysteine (Cys) in a simple and fast way because of its potential applications in biological processes. In this contribution, we proposed a Cu2+-mediated fluorescence switchable strategy to detect Cys by designing a dual-signal fluorescence-enhanced sensor. Two organic dyes immobilized onto layered double hydroxides (LDHs) as novel sensors have been fabricated. It was found that the two fluorescence emissions of the obtained ultrathin films (donated as calcein@NFR/LDHs UTFs) could be effectively quenched by Cu2+ (off state), then reversibly recovered by Cys (on state) owing to the specific coordination of Cys and Cu2+. Under the optimal conditions, there were good linear relationships between the off–on efficiency (off–on) and the amount of Cys in the range of 1.0 × 10−7–1.2 × 10−6 M, with lower detection limits of 5.0 × 10−8 M at 520 nm and 2.3 × 10−8 M at 607 nm, respectively. There is little interference by common ions, amino acids and some excipients. The dual-signal fluorescence-enhanced response of the sensor contributes to its high sensitivity and selectivity. The proposed strategy is label-free, fast and selective, which is applicable to the analysis of Cys in medicine with satisfactory results.
研究领域:
生物化学
·
分析化学
·
医学检测
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Houmei You,Jinpeng Hou,Yiwen Shen,Xiangkun Zhang,Jiaxue Cai,Yaya Zhang,Yongjun Feng,Weiliang Tian,Kewei Zhang
Solid-state light-emitting devices are of special interest in optoelectronic applications, owing to inherent advantages in terms of low cost, high efficiency and desirable durability. However, the accumulation of solid fluorescent chromophores causes serious energy transfer, resulting in fluorescence quenching. Herein, exfoliated vermiculite (VMT) was structurally disassembled into Mg-O octahedral and Si-O tetrahedral layers to produce hydrotalcite (LDHs) and SiO 2 , respectively, realizing efficient utilization of each component and VMT surface. The fluorescent intercalated LDHs was intercalated with organic fluorescent dyes, including rhodamine 6G (R6G), pyronine G (PG) and sodium fluorescein (Fl-Na), to prepare high-performance fluorescent LDHs, which was further assembled with VMT nanosheets to form ultrathin solid-state light-emitting films. Based on the electrostatic self-assembly strategy, the localization of chromophores and light-emitting intensity of solid films can be precisely controlled by adjusting ordered multilayers. In fact, the exfoliated VMT could cause the quenching of organic fluorescent dyes in liquid, therefore VMT can be used as fluorescent quencher, which could be regenerated by heating. The designed assembly strategy avoids the fluorescence quenching of VMT. Without the addition of any surfactant, both anionic and cationic organic fluorescent dye can be intercalated into hydrotalcite, overcoming the disadvantage of LDHs that can only intercalate anionic molecules. In particular, the VMT encapsulation overcomes the quenching problem of fluorescent dye and improves the stability of the light-emitting films. This work provides a potential strategy for assembling solid-state light-emitting films and opens new applications in various optoelectronics, such as surface-emitting light source and full-color flat-panel displays.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Water Process Engineering
·
2023
·
IF 7
Qingsheng Xu,Zhengbo Yue,Rui Deng,Xinquan Wang,Xiao He,Xin Chuai,Shaoping Wang,Jin Wang
The alkaline sludge produced by the neutralization treatment of acid mine drainage (AMD) is not only large and difficult to treat, but also prone to secondary pollution. The cost of conventional sludge treatment technology is high, so there is an urgent need to develop new methods. The process of neutralizing AMD is similar to the co-precipitation reaction of LDHs, so the cost of recovering LDHs from AMD is lower, but the application performance of LDHs is limited by the stacking of laminates. In this paper, the structure of LDHs was optimized by adding biochar (BC) during the neutralization process of AMD. After adding 40 % BC, the crystal planes of alkaline sludge based LDHs (AS-LDHs) became more parallel, and the adsorption properties of Cd and Cu were increased by 2.7 and 1.95 times, with the maximum adsorption amounts of 901.5 and 231.3 mg/g, respectively. The relevant removal mechanism was investigated in depth at the electronic scale by experiments combined with DFT calculations. Since AS-LDHs have the advantages of good acid stability, low zero-point charge and strong adsorption and regeneration capacity, this method has a broad application prospect.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2025
·
IF 26.8
Weiyu Chen,Yuan Wu,Jianhua Luo,Wei Wei,Qitao Hu,Yiming Xu,Xinjie Zheng,Zhouyi Sun,Lingge Yang,Junkang Ding,Liyun Xu,Shugao Han,Weibo Cai,Kai Wang
Interventional thermal therapy, such as radiofrequency ablation (RFA), is a preferred therapy for non-small cell lung cancer (NSCLC) patients. However, part of some patients will still suffer from tumor recurrence due to incomplete ablation (e.g., restricted thermal conductivity, etc.). Notably, RFA can evoke anti-tumor immunity by releasing tumor-associated antigens (TAAs), but this effect is weak. Herein, to boost thermal and immune therapeutic efficiency for complete tumor eradication, an effective nano-adjuvant (CpG-pIL12-LDHs, LC12), layered double hydroxides (LDHs) carrying immune stimulators, CpG ODN (CpG) and IL-12 plasmid (pIL-12), is developed, which is further integrated into a 3D-printed collar for eliciting potent thermotherapy and therapeutic vaccine against lung cancer. The as-prepared 3D-printed adjuvant collar (3D-LC12) can be attached to the RFA electronic needle and respond to the radiofrequency electrical field during treatment, enhancing ablation temperature, area, and nano-adjuvant's diffusion. After release from the temperature-sensitive collar, LC12 can form an in situ therapeutic cancer vaccine, activate APCs, and remodel the tumor microenvironment (TME), triggering a robust antitumor immune response. Therefore, the current study demonstrates a multi-functional 3D-printed adjuvant collar for efficient eradication of lung cancer via one-time RFA-integrated therapy, providing a novel combined strategy for interventional thermal therapy against tumors.
研究领域:
生物医学工程
·
肿瘤学
·
免疫治疗
·
纳米技术
·
3D打印
·
介入放射学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2021
·
IF 5.316
Chunyan Li,Xin Li,Huiqin Wang,MengLing Zheng,Fang Tian,RuYong Tan,Pengwei Huo,Yan Yan,Xinkun Wang
Ternary metal layered double hydroxides (LDHs) have been widely used in supercapacitors (SCs) due to their polyvalent state and high electrochemical activity. In this study, Ga (III) doped NiCo layered double hydroxides (NiCoGa-LDHs) electrode material is prepared on carbon cloth (CC) by simple one-step hydrothermal method for the first time. The effects of Ga 3+ with different molar ratios on the structure, morphology, crystallinity, ion transport mechanics and electrochemical properties of ternary LDHs electrode materials are systematically investigated. At Ga 3+ = 1.0, the as-synthesized Ni 1 Co 3 Ga 1 -LDHs@CC exhibits a special electrochemical capacitance of 2012.5 F g -1 at 1 A g -1 with 57.7% capacitance retention observed at 5.0 A g -1 . The synthesis and evaluation of the two bimetallic NiCo-LDHs and NiGa-LDHs are similar in order to demonstrate the performance improvement of gallium heterovalent substitution. And heterovalent substitution of gallium for cobalt ion and nickel ion is proved indirectly. An Asymmetric supercapacitors (ASCs) device is assembled with Ni 1 Co 3 Ga 1 -LDHs@CC as anode and mesoporous carbon (MPC) as cathode, providing a high energy density of 84.22 Wh kg -1 at a power density of 800.1 W kg -1 , with excellent cyclic stability. This study provides a new way to improve the electrochemical performance and stability of ternary metal LDHs.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
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