Journal of Materials Chemistry A
·
2024
·
IF 10.7
Zhiwen Wang,Feng Li,Qianyi Zhang,Keer Ouyang,Ruiqi Shen,Yinghua Ye,Luigi Tonino DeLuca,Wei Zhang
Reliable strategies to enhance the energy density of electrically controlled solid propellant (ECSP), a promising intelligent propulsion fuel, is a challenge due to potential hazards for typical high-reactivity micro-nano metal fuels induced by manufacturing procedure involving water. Herein, we reversed the detrimental effect of water to a safety protection characteristic by doping micron-sized Zr@PVP fuel into ECSP. Zr@PVP composite particles with low electrostatic discharge (ESD) sensitivity were fabricated by coating Zr with PVP containing hydrophilic groups, which were suitable for one-pot fabrication of fully electrostatically isolated ECSP owing to the contribution of water to electrostatic shielding. Pyrolysis characteristics revealed that Zr could promote concentrated-rapid exothermic decomposition of the propellant due to possible compositional catalytic effects. Electrically controlled combustion diagnosis demonstrated that Zr significantly enhanced propellant combustion. Accordingly, we proposed the potential mechanism of excited-Zr to form fireballs as a "hot spot" that continuously triggers the diffusion combustion of highly reactive intermediates. Our efforts provide a prospect-fate for the zirconium powder with high ESD sensitivity and water-containing electrically controlled propellants possessing poor compatibility with typical high-activity metal powders.
研究领域:
航空航天工程
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材料科学
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化学工程
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推进技术
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2025
·
IF 9
Jinxiong Song,Lijun Song,Biao Ai,Youcai Chen,Ying Liu,Yuzhang Zhu,Jian Jin
Thin-film composite (TFC) polyamide (PA) nanofiltration (NF) membranes are essential for separating ions and small molecules in the industries, including water treatment, chemical processing, energy production, and pharmaceuticals. These membranes are typically fabricated via interfacial polymerization (IP) on polysulfone (PSf) or polyethersulfone (PES) ultrafiltration (UF) supports. Apparently, optimizing the physicochemical properties of the UF support is very important for achieving TFC-PA NF membranes with superior separation performance. This study systematically investigated the influence of common pore-forming agents used in UF membrane fabrication, specifically polyvinylpyrrolidone (PVP), polyethylene glycol (PEG), and lithium chloride (LiCl), on the desalination performance of resulting TFC-PA NF membranes. We characterized the zeta potential, pore structure, and surface wettability of PSf UF membranes prepared with each pore agent. These characteristics were then correlated with the adsorption and desorption behavior of piperazine (PIP) monomers during the IP process. Our findings indicate that employing PVP as a pore-forming agent not only enhanced PIP adsorption within the UF support but also facilitated its rapid release during the IP reaction. This dual effect resulted in a PA selective layer with reduced thickness and smaller pore size. Consequently, the TFC-PA NF membrane fabricated on the PVP-modified UF support exhibited both higher water permeance and improved salt rejection. This research highlights the significant role of the pore-forming agent in determining the performance of TFC-PA NF membranes. The results suggest that UF supports prepared using PVP as a pore agent may be optimal for creating NF membranes with enhanced overall performance.
研究领域:
膜科学
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分离技术
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高分子科学
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水处理
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化学工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
ELECTROCHEMISTRY
·
2015
·Vol. 83
·期 3
·155-160
·
IF 1.033
Yan-qing LI,Ying LUO,Li-jun LI,Hao CHENG,Wen-yi HUANG
In order to establish a simple, sensitive and rapid method for the determination of azithromycin, the gold electrode modified with Silica sol/Nano-Au/PVP/Ru(bpy)32+ was prepared, and the electrochemiluminescence (ECL) method was developed for the determination of azithromycin based on the sensitizing effect of azithromycin on Ru(bpy)32+. Moreover, the electrochemical behaviors and the electrochemical luminescence behaviors of the Ru(bpy)32+ system and the Ru(bpy)32+- azithromycin system were investigated by ECL respectively. The results show that the proposed electrode showed very good electrochemical activity and electrochemiluminescence response to the Ru(bpy)32+- azithromycin system, under the optimum experimental condition, the linearity of azithromycin concentration to ECL intensity was achieved in the concentration of azithromycin from 1.0 × 10−7 to 1.0 × 10−4 mol L−1 and the detection limit (S/N = 3) was 1.33 × 10−9 mol L−1. Through the parallel determination of 1.0 × 10−5 mol L−1 azithromycin for 8 times, the RSD of results was 1.82%, and the recovery ranging from 97.9% to 101.6% was obtained in the detection of azithromycin tabelets and the RSD was 1.36% (n = 5). The proposed method showed high selectivity and sensitivity and simplicity, and it could be applied to the analysis of azithromycin with satisfactory results.
研究领域:
分析化学
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药物分析
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生物医学工程
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Zheqin Chen,Yongmin Xie,Zhibin Lu,Xiaocong Zhong,Zhifeng Xu
This research addresses the issue of particle agglomeration and a low catalytic activity in the traditional sol–gel preparation of LaNi 0.5 Co 0.5 O 3 (LNCO). A new synthetic strategy is proposed, leveraging the combination of polyvinylpyrrolidone (PVP) serving as a complexing agent and graphene nanosheet (GN) functioning as a template, successfully producing a high-activity LNCO cathode material (GN-LNCO) with a layered structure. Various characterizations confirmed that incorporating PVP and GN effectively suppressed particle agglomeration at high temperatures. The optimized GN-LNCO exhibited excellent physicochemical properties, including a specific surface area of 45.21 m 2 g −1 , a more regular mesoporous structure, a higher electronic conductivity, and a greater oxygen vacancy concentration. Electrochemical performance tests showed that the GN-LNCO cathode demonstrated an outstanding performance in solid oxide fuel cells at 800 °C, with a peak power density of 350.91 mW cm −2 . This represented an improvement of 28.65% over the conventional LNCO. Additionally, a 72 h long-term stability test of a GN-LNCO single cell revealed a voltage decay rate of only 1.60%, indicating its excellent stability. Overall, this study provides a novel material design strategy for developing high-performance cathodes, which has significant implications for advancing solid oxide fuel cell technologies.
研究领域:
材料科学
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电化学
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能源技术
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纳米技术
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无机化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2024
·
IF 9.4
Rongrong Mu,Guoquan Suo,Chuanjin Lin,Jiarong Li,Xiaojiang Hou,Xiaohui Ye,Yanling Yang,Li Zhang
In recent years, aqueous zinc-ion batteries (ZIBs) have emerged as a prominent research topic due to their inherent safety attributes, relatively low cost, and comparatively higher energy density. However, the challenges associated with the zinc metal anode in the form of dendrite formation, hydrogen evolution, and severe side reactions have proven to be particularly vexing. Thus, it is imperative to investigate novel intercalation-type anode materials for ZIBs that exhibit exceptional structural properties and appropriate redox potentials based on conversion mechanisms. In this work, through adding polyvinylpyrrolidone (PVP) surfactant to precursors and tailoring reaction time, hierarchical CuS hollow spheres are successfully constructed by a facile one-step hydrothermal process. When applied as an anode in ZIBs, the hollow hierarchical CuS with large surface area can effectively reduce the transport distance of electrons and Zn 2+ and alleviate volume expansion during the insertion/extraction of Zn 2+ . The hierarchical CuS hollow spheres prepared over 8 h (CuS-8) exhibit a specific capacity of 126 mAh/g and long-term cycle life (1500 cycles) at a current density of 3 A/g. In addition, CuS-8//MnO 2 @CNTs full-cell shows a capacity retention of 117 mAh/g after 300 cycles at 1 A/g current density, which proves the advantage of hierarchical CuS hollow spheres in serving as an efficient and durable anode material for ZIBs.
研究领域:
材料科学
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电化学
·
能量存储
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2021
·Vol. 32
·期 11
·14368-14384
·
IF 2.478
Hu Yongcai,Du Zhaofu,Yao Yingbang,Ma Yue,Li Yi,Xu Yiwen,Zhao Xiaobo,Tao Tao,Liang Bo,Lu Shengguo
Silver powders were prepared by a chemical reduction method. Effects of different surfactants during this preparation process were examined. Using these silver powders, silver pastes were prepared for low temperature co-fired ceramics (LTCC) applications. Another batch of different surfactants were added into the silver paste and evaluated. Moreover, various organic thixotropic agents were used to modify the thixotropy behavior of the silver paste. It was found that the surfactants of PVP (Polyvinyl pyrrolidone, for preparation of the silver powder) and Span-85 (for the preparation of silver paste) exhibited the best performance, with an electrical resistivity of 0.11 mΩ mm. The silver paste with the thixotropic agent of hydrogenated castor oil shows the largest thixotropic index of 1.56. Using different organic additives, the microstructural, rheological and electrical properties of the silver paste can be considerably improved, and our results shed light on the optimization of the silver paste for LTCC applications.
研究领域:
材料科学
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化学工程
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电气工程
✓ 已验证
DOI
高影响因子
Catalysts
·
2025
·Vol. 15
·期 4
·299
·
IF 4
Yanyang Fan,Ping Guo,Jun Liu
A metal-doped modified CO oxidation catalyst with strong adsorption and water resistance for coalbed methane was prepared by the CO precipitation method. The CO ablation characteristics were tested, and the Cu Mn catalyst synthesized by metal Ce doping achieved an instantaneous ablation efficiency of 80% when in contact with CO at room temperature. By analyzing the surface crystal structure and pore characteristics, as well as by testing the ablation properties, it was found that the CO oxidation catalyst synthesized by Ce had the best effect at a precipitation temperature of 70 °C. A water-resistant CO oxidation catalyst was synthesized by adding polyvinyl alcohol (PVA) and polyvinylpyrrolidone (PVP). After storage at a relative humidity of 90%, it still had a CO adsorption rate of about 85%. The water-resistant CO oxidation catalyst prepared with polyvinyl alcohol (PVA) as an additive had a higher content of CeO2crystal nuclei, and the PVA-added CO oxidation catalyst had the best ablation characteristics. In the evaluation of the water-resistant steam ablation process, the CuMnOx-Ce-PVA catalyst showed a significant increase in intermediate products during the stress process under water vapor conditions and a decrease in the peak value of the catalyst’s binding to water, and the catalyst has a particular inhibitory influence on the adsorption of water molecules on its surface. Due to its outstanding water resistance, the catalyst was able to retain good ablation characteristics.
研究领域:
环境催化
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化学工程
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材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
ACS Applied Nano Materials
·
2024
·
IF 5.3
Bowen Li,Mengfan Pei,Yunpeng Qu,Chang Su,Jinfeng Zhang,Xin Jin,Lin Wang,Xigao Jian,Fangyuan Hu
The development of wearable devices requires flexible batteries that can be bent and folded. However, deficiencies in material flexibility, conductivity, and other aspects can affect the performance of a flexible electrode. One-dimensional nanofibers possess high specific surface area, high conductivity, and a 3D network structure that enables them to buffer stress and strain. Consequently, they hold significant potential in the field of electrochemical energy storage as flexible electrode materials. In this study, we utilized polyvinylpyrrolidone (PVP) as a template to form a supramolecular polymer (PNDS) through hydrogen bonding between 1,4,5,8-naphthalene tetracarboxylic acid (NTCA) and 3,3′-diaminobenzidine (DAB) monomers. Through core–shell electrospinning and carbonization, PNDS precursors were used to prepare polybis(benzimidazobenzophenanthroline-dione) (BBB)-based carbon nanofibers featuring a core–shell structure. The BBB polymer, featuring a continuous aromatic ring structure, undergoes conversion into a highly graphitic carbon skeleton upon carbonization at 1000 °C. This transformation enhances the conductivity of flexible electrodes, improves the current collection effect under high currents, and ensures stability in the charge–discharge cycle. The iron-containing polymers within the shell layer ultimately transform into iron oxide and iron carbide nanoparticles encapsulated within the carbon fibers, compensating for the lower specific capacity characteristic of pure carbon materials. Serving as a SIB flexible anode, the specific capacity can achieve 250 mAh g–1 after 950 cycles at 0.2 A g–1, with negligible attenuation throughout the cycling process. This study demonstrates that BBB-based carbon nanofibers featuring core–shell structures exhibit excellent electrochemical performance while retaining flexibility, presenting clear advantages over traditional electrodes characterized by complicated processes and limited active substance content.
研究领域:
材料科学
·
电化学
·
纳米技术
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Baozhu Zhao,Haowen Yang,Jin Mao,Qi Zhou,Qianchun Deng,Lei Zheng,Jie Shi
The creation of a new metal–organic framework (MOF) with a hollow hierarchical porous structure has gained significant attention in the realm of enzyme immobilization. The present work employed a novel, facile, and effective combinatorial technique to synthesize modified MOF (N-PVP/HZIF-8) with a hierarchically porous core–shell structure, allowing for the preservation of the structural integrity of the encapsulated enzyme molecules. Scanning electron microscopy, X-ray diffraction, X-ray photoelectron spectroscopy, confocal laser scanning microscopy, and other characterization tools were used to fully explore the changes of morphological structure and surface properties in different stages of the preparation of immobilization enzyme CRL-N-PVP/HZIF-8, thus showing the superiority of N-PVP/HZIF-8 as an enzyme immobilization platform and the logic of the immobilization process on the carrier. Additionally, the maximum enzyme loading was 216.3 mg mL–1, the relative activity of CRL-N-PVP/HZIF-8 increased by 15 times compared with the CRL@ZIF-8 immobilized in situ, and exhibited quite good thermal, chemical, and operational stability. With a maximal conversion of 88.8%, CRL-N-PVP/HZIF-8 demonstrated good catalytic performance in the biosynthesis of phytosterol esters as a proof of concept. It is anticipated that this work will offer fresh concepts from several perspectives for the creation of MOF-based immobilized enzymes for biotechnological uses.
研究领域:
材料科学
·
生物化学
·
生物技术
·
催化
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2025
·
IF 4.3
Zixuan Xu,Liqiang Qi,Song Wang,Gaoshan Xing,Wen Wang,Zhaoyang Liu
The PVDF/PVP/SiO 2 /CS nanofibrous membrane was synthesized using polyvinylidene fluoride (PVDF), polyvinylpyrrolidone (PVP), nanosilica (SiO 2 ), and chitosan (CS) as raw materials through a one-step electrospinning process, specifically developed for the treatment of complex oily wastewater. The membrane exhibited exceptional hydrophilicity, underwater oil repellency, self-cleaning properties, and a porous fiber structure. Its pure water flux reached 7894.50 L·m −2 ·h −1 ·bar −1 , with an average fiber diameter of 130 nm and an underwater oil contact angle exceeding 140°. The hydration layer enabled the membrane to effectively separate oil–water mixtures and emulsions composed of engine oil, carbon tetrachloride (CCl 4 ), toluene (C 7 H 8 ), soybean oil, cyclohexane (C 6 H 12 ), and other oil agents from water, achieving an efficiency greater than 99 %. Furthermore, the PVDF/PVP/SiO 2 /CS nanofiber membrane successfully captured dyes and heavy metal ions through hydration, hydrogen bonding (HB), electrostatic interactions (ESI), π-π interactions, and chelation mechanisms. The retention efficiencies of the membrane for Rhodamine B (RB), chromium ions (Cr 6+ ), methyl orange (MO), methylene blue (MB), malachite green (MG), and lead ions (Pb 2+ ) were 71.4 %, 74.0 %, 83.3 %, 85.6 %, 88.5 %, and 95.1 %, respectively. After filtration, the membrane flux values were 6042.64, 6653.40, 5689.85, 5865.40, 5732.68, and 6652.70 L·m −2 ·h −1 ·bar −1 , with a maximum membrane flux loss of no more than 25 %. The membrane demonstrated retention efficiencies of 72.4 %, 75.3 %, 79.4 %, 81.2 %, 84.3 %, and 92.3 % for the removal of RB, Cr 6+ , MO, MB, MG, and Pb 2+ from wastewater containing dual pollutants of oil–water emulsions with heavy metal ions and dyes. The separation efficiency for oil–water emulsions in the dual-pollutant wastewater exceeded 99 %.
研究领域:
环境科学
·
材料科学
·
化学工程
·
纳米技术
·
水处理
·
膜技术
✓ 已验证
产品关联
DOI
高影响因子
Polymer Chemistry
·
2015
·Vol. 6
·期 21
·3926-3933
·
IF 5.52
Shanshan Liu,Qibin Chen,Yujie Sheng,Jincheng Shen,Changjun Peng,Honglai Liu
Developing supramolecular helical assemblies with a controlled helix sense and revealing the forming mechanism of hierarchical helices for mimicking biological self-organization and physiological processes remain major challenges. In this work, a bottlebrush-like supramolecular polymer is prepared through the formation of a hydrogen bond between the keto group of polyvinylpyrrolidone (PVP) and the phenolic hydroxyl group of p-dodecylphenol (PDP), characterized by 1H NMR and FT-IR spectroscopy. CD spectra show an unsplit Cotton effect, suggesting the emergence of a helical structure in this supramolecular polymer brush (PVP–PDP). In particular, straightforward experimental evidence for the formation of hierarchical helices is obtained via TEM and AFM methods. We propose a detailed structural transition of the hierarchical helix or superhelix of PVP–PDP from primary to secondary, tertiary and even quaternary structures, resulting from the incorporation of bulky pendant PDP into the PVP backbone and the binding site of the hydrogen bond at ortho-position.
研究领域:
超分子化学
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高分子科学
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材料科学
·
纳米技术
·
生物物理学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2023
·
IF 5.9
Zhitong Jia,Songyuan Sun,Ao Li,Huigui Wu,Guoqiang Qin,Tong Liu,Pengpeng Lv,Jingbo Chen
Titanium dioxide (TiO2) is a promising anode material for lithium-ion batteries with the characteristics of highly stable structure and excellent safety, while the application is constrained by its inferior electrical conductivity and sluggish lithium-ion diffusion kinetics. Herein, H2Ti4O9 was prepared as a precursor, and it was wrapped with polyvinylpyrrolidone (PVP) as the nitrogen and carbon sources. Then, the N-doped carbon-filled TiO2 nanocrystals (N-TiO2/C), which had a unique dragon fruit structure with TiO2 nanocrystals acting as seeds and carbon acting as the flesh, were successfully prepared from PVP-coated H2Ti4O9 by one-step heat treatment. It is noteworthy that four modification methods, including carbon filling, nanosizing, nitrogen doping, and morphological designing, are all accomplished simultaneously during this process. The N-TiO2/C composite exhibits an outstanding stable capacity of 444.6 mAh g–1 after 600 cycles at 1 A g–1, and it possesses a reversible capacity of 146.7 mAh g–1 at 5 A g–1. The superior electrochemical capacity can be attributed to the distinctive dragon fruit structure along with nitrogen doping and carbon filling. The ingenious modification strategy can extend to the investigation on the other oxide anode materials.
研究领域:
材料科学
·
电化学
·
能源存储
·
纳米技术
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）