RSC Advances
·
2015
·Vol. 5
·期 96
·78519-78525
·
IF 3.84
Lei Zhao,Xianglu Peng,Shenghong Yang,Yuan Zhang,Jing Wu,Xuan Wei,Fengyun Li,Qiaosheng Pu
Self-assemblies of polyelectrolytes have been widely used to tailor surface charges, but their stability varies significantly due to the diverse properties of both polyelectrolytes and surfaces. Fast and reliable evaluation of the stability of the assembled layers is essential to optimize the assembling processes and select the proper working conditions. In this work, the applicability of the pulsed streaming potential measurement for real-time evaluation of stability of assembled layers was demonstrated. Polyethyleneimine (PEI) with a molecular weight of 1800 was selected as the model polyelectrolyte and the results confirmed the dependence of the stability of the assembled layers on the assembling conditions. A parameter SR, which is defined as the relative zeta potential change rate, was adopted to reflect the difference of the positively charged layer. Effect of assembling conditions, including pH, polyelectrolyte concentration and contact time, on the change of the streaming potential were evaluated based on SR values. The feasibility of the technique for the evaluation of the stability of adsorbed proteins, oligonucleotides and cells onto the formed PEI layer was also investigated and its reliability was confirmed by capillary electrophoresis.
研究领域:
材料科学
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表面化学
·
电化学
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DOI
高影响因子
JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2023
·Vol. 27
·期 4
·1011-1020
·
IF 2.5
Zhang Dongxing,Zou Jie,Li Fuan,Yuan Tao,Su Yuanjie,Jian Jiawen
Mixed-potential type ammonia sensors based on yttria-stabilized zirconia are promising devices in NO x reducing system for high-temperature exhaust. However, selectivity is a critical issue that should be urgently addressed. Herein, a novel bilayer Cr 2 O 3 |In 2 O 3 sensing electrode (SE) was designed to improve the selectivity of the ammonia sensor, in which an additional Cr 2 O 3 layer was deposited on In 2 O 3 SE. The selectivity was examined in NH 3 , CO, NO and NO 2 . Finally, the sensor with the bilayer Cr 2 O 3 |In 2 O 3 SE exhibits an improvement of NH 3 selectivity at 600 °C, which is attributed to the Cr 2 O 3 layer catalysing the removal of CO and NO x before the gases reach the triple-phase boundaries (TPBs). Furthermore, the mixed-potential model of the NH 3 sensor with the bilayer SE was identified using the polarization curves obtained in different concentrations of NH 3 . Additionally, the proposed sensor displayed a good repeatability and resistances to CO 2 and H 2 O. This innovative bilayer Cr 2 O 3 |In 2 O 3 SE is expected to be applied in high-temperature NH 3 detection.
研究领域:
材料科学
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环境工程
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产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2022
·Vol. 10
·期 40
·21368-21378
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IF 14.511
Changcheng Jiang,Xuejun Lai,Zhengzhong Wu,Hongqiang Li,Xingrong Zeng,Yinan Zhao,Qingtao Zeng,Jiefeng Gao,Yurong Zhu
High fire-safety and sensitive temperature-response materials are urgently needed for the development of intelligent fire protection. Herein, a multifunctional flame-retardant ionic hydrogel (HTIG) with high thermopower was fabricated via free-radical polymerization. The HTIG exhibited high thermopower, sensitive fire warning and strain sensing, excellent flame retardancy and self-adhesive performance. The thermopower of the HTIG was as high as 3.04 mV K−1, which was tens of times higher than those of traditional electronic thermoelectric materials, and it showed a good linear relationship between the voltage and temperature difference. When being burned, the HTIG triggered the fire alarm in about 4 s and generated a voltage of more than 100 mV. More importantly, the HTIG showed high fire safety. It was quickly self-extinguished when removed from the fire. It increased the limiting oxygen index (LOI) of wood from 27% to more than 80%. Besides, the HTIG displayed good strain sensing performance, which could be used for motion monitoring. Our work provided new insights for the preparation of the next generation of intelligent multifunctional fireproof materials.
研究领域:
材料科学
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消防安全工程
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聚合物化学
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产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Lulu Zhu,Baiyu Zhang,Qian Su,Runlu Liu,Jingyi Lin,Hua Wang,Shenmin Zhu,Yao Li
Photoinduced charge separation and surface reactions are essential for ensuring high quantum efficiency of the photochemical and photophysical processes. BiVO4-based heterojunctions are promising materials for high-performance photocatalysts; however, their photocatalytic performance is significantly lower than the theoretical limit due to the sluggish water oxidation dynamics and rapid recombination of charge carriers on the catalyst surface. To address these issues, oxygen vacancies (OVs) are introduced to a rationally designed BiVO4-based heterojunction using built-in potential and gradient OVs to promote the separation of carriers and increase the photocatalytic activity. The heterojunctions with OVs exhibit a 2-fold increase in the photocatalytic activity for phenol degradation compared with that of pristine BiVO4. Additionally, density functional theory is applied to elucidate the synergistic mechanism of light absorption and charge separation in BiOCl/BiVO4 p–n heterojunction photocatalysts containing vacancies. The obtained results demonstrate a synergistic effect of vacancies and the built-in potential, providing a pathway for defect engineering in photocatalytic processes.
研究领域:
材料科学
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环境科学
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理论化学
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产品关联
DOI
PubMed
高影响因子
Polymers
·
2025
·Vol. 17
·期 8
·1001
·
IF 4.9
Jingjia He,Lili Wang,Kaiyuan Zheng,Shoukang Hu,Xueke Zhang,Ziyu Mu
In this work, Mg2+modified chitosan (Mg2+/CS) is proposed and successfully designed. By investigating the effects of the Mg2+and CS interaction on hydrogen bonding, dipoles, charge density, surface potential, and roughness, the coordination between Mg2+and CS is verified and the mechanism of coordination improving tribological properties is elucidated. The Mg2+/CS coordination structure enhances intermolecular interactions, promoting the formation of new hydrogen bonds and increasing the dipoles. Compared to CS, the relative dielectric constant of Mg2+/CS increased by 76%, the surface potential increased by 70 mV, and the root mean square roughness increased by 39.4 nm. The open-circuit voltage, short-circuit current, and charge density of the triboelectric nanogenerator (TENG) fabricated from Mg2+/CS were increased by 100%, 94%, and 75%, respectively, compared to the CS-TENG fabricated from pure CS. The coordination of Mg2+increased the charge density of the Mg2+/CS-TENG, significantly enhancing its charge transfer capability. The Mg2+/CS-TENG successfully provided power for photodetectors and LEDs. Mg2+/CS exhibited excellent flexibility and skin adhesion, and the Mg2+/CS-TENG successfully converted the mechanical energy generated by human joint motion into electrical signals. The coordination structure of Mg2+with CS enhances the triboelectric performance of Mg2+/CS-TENG, providing new light for the research of chitosan-based TENGs.
研究领域:
材料科学
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
SENSORS AND ACTUATORS B-CHEMICAL
·
2016
·
IF 4.758
Weiwei Meng,Lei Dai,Wei Meng,Huizhu Zhou,Yuehua Li,Zhangxing He,Ling Wang
Mixed-potential type NH 3 sensors were fabricated using La 10 Si 5.5 Al 0.5 O 27 (LSAO) consisting of a porous layer and a dense layer as solid electrolyte and TiO 2 as the sensing electrode. The effect of a LSAO porous layer and TiO 2 phase transformation on sensor performances was investigated. The porous layer of LSAO electrolyte obviously enhanced sensor performance. Compared with the sensor without a LSAO porous layer, the sensor with LSAO porous layer exhibited larger responding potential values and higher sensitivity due to the enhanced three phase interface length. Anatase-TiO 2 (a-TiO 2 ) based sensor exhibited better sensing performance than rutile-TiO 2 (r-TiO 2 ) based sensor at the examined temperature range. A-TiO 2 transformation toward r-TiO 2 resulted in poor sensing performances of the sensor. The best sensing characteristics were achieved for the NH 3 sensor with a-TiO 2 sensing electrode calcined at 900 °C for 3 h. The potential values of the sensor response to NH 3 linearly depended on the logarithm of NH 3 concentrations at 450–600 °C and the sensitivity reached 169.7 mV/decade in the range of 50–400 ppm at 500 °C. At the same time, the sensor exhibited well anti-interference capability to H 2 , NO, CH 4 and CO 2 , but a little cross-sensitivity toward NO 2 was observed. High temperature treatment (>900 °C) caused a-TiO 2 transformation into r-TiO 2 and V 2 O 5 additions were conducive to TiO 2 phase transformation.
研究领域:
材料科学
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传感器技术
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环境监测
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产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Pengsen Zhao,Haizhong Zheng,Guifa Li,Yongxiang Geng,Yixin Xiao,Hongbo Guo,Ping Peng
The CaO–MgO–Al 2 O 3 –SiO 2 (CMAS) corrosion resistance of La 3+ -Yb 3+ -Ce 4+ co-doped ZrO 2 (LYZC) ceramic was systematically discussed via experiment and first-principles calculation. Results demonstrate that at the CMAS/RE-ZrO 2 interface, RE is dissolved in molten CMAS to form some RE-apatite particles, which effectively inhibits CMAS penetration. Compared with La 3+ doped ZrO 2 (LZ), LYZC owns a better ability to maintain the coating microstructure under CMAS corroded, which is conducive to alleviating CMAS penetration. This conclusion is also confirmed by the low diffusion coefficients ( D ) of RE and Zr in CMAS/LYZC(111), which are only 2.305–5.556 × 10 −8 m/s and 2.694–3.421 × 10 −8 m/s, respectively. Furthermore, the small electrostatic potential difference (Δ V = 1.578–1.654 eV) of the CMAS/LYZC(111) terminal layer suggests that molten CMAS does not easily adhere to the LYZC surface.
研究领域:
材料科学
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理论计算
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产品关联
DOI
高影响因子
Joule
·
2022
·
IF 46.048
Sunmiao Fang,Jidong Li,Ying Xu,Chun Shen,Wanlin Guo
The conversion of ambient heat into electricity through ubiquitous natural evaporation offers hope for new green energy technologies. So far, evaporation-induced electricity has relied mainly on the classical streaming potential, which is an electric potential generated by driving an electrolyte through a narrow channel under a pressure gradient. Here, we show that evaporation of ethanol from nanostructured carbon films can produce a sustainable volt-level potential in an environment free from the streaming potential, which we term the evaporating potential. This evaporating potential is proven to occur within a narrow partially wetted region ahead of the main capillary film and is directly generated by carrier transfer driven by evaporation of ethanol molecules. It is also shown that other polar solvents can generate potentials comparable to those induced by ethanol. The finding could open a new way to harvest environmental energy through natural processes.
研究领域:
能源科学
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材料科学
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环境科学
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DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
·
2025
·
IF 17.7
Chao Feng,Jiaxin Shao,Hanyang Wu,Afaq Hassan,Hengpan Yang,Jiaying Yu,Qi Hu,Chuanxin He
It is well known that transition metal sulfides (TMS) (i.e., NiS 2 ) undergo electrochemical reconstructions to generate highly active Ni 3 S 2 during the process of hydrogen evolution reaction (HER) under overpotentials of < 500 mV. However, at higher overpotentials, Ni 3 S 2 can theoretically be further restructured into Ni and thus form Ni/Ni 3 S 2 heterogeneous interface structures, which may provide opportunities to further enhance HER activity of NiS 2 . Here, we selected NiS 2 as a model electrocatalyst and investigated the influence of the reconstruction results induced from regular to ultrahigh overpotentials on its electrocatalytic hydrogen precipitation performance. The experimental results showed that the most significant enhancement of hydrogen precipitation performance was obtained for the NiS 2 @CC-900 (900 means 900 mV overpotential) sample after the ultra-high overpotential induced reconstruction. Compared with the initial overpotential of 161 mV (10 mA cm –2 ), the overpotential of the reconstructed sample reduced by 67 mV (42%). The characterization results showed that an ultra-high overpotential of 900 mV induced deep reconstruction of NiS 2 , formed highly reactive Ni/Ni 3 S 2 heterogeneous interfaces, which is more conducive to improved HER performance and match well with theoretical calculations results. We demonstrated ultrahigh overpotential was an effective strategy to induce NiS 2 deeply reconstruction and significantly improve its HER performance, and this strategy was also applicable to CoS 2 and FeS 2 . This study provides an extremely simple and universal pathway for the reasonable construction of efficient electrocatalysts by induced TMS deeply reconstruction.
研究领域:
材料科学
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电化学
·
催化
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DOI
高影响因子
CHINESE JOURNAL OF STRUCTURAL CHEMISTRY
·
2024
·
IF 5.9
Yongheng Ren,Yang Chen,Hongwei Chen,Lu Zhang,Jiangfeng Yang,Qi Shi,Lin-Bing Sun,Jinping Li,Libo Li
The identical molecular size and similar physical properties of carbon dioxide (CO 2 ) and acetylene (C 2 H 2 ) make their adsorptive separation extremely challenging to achieve with most adsorbents. Reports on the separation of CO 2 and C 2 H 2 mixtures by zeolites are even rarer with the mechanism of adsorptive separation requiring further exploration. In this paper, we report that ion modulation of zeolite 5A promotes the difference in kinetic diffusion of CO 2 and C 2 H 2 , realizing the inverse separation of zeolite from selective adsorption of C 2 H 2 to selective adsorption of CO 2 . Creating a compact pore space restricting the orientation of gas molecules enables charge recognition. The positive electrostatic potential at the pore openings was utilized to hinder the diffusion of C 2 H 2 between the cages while ensuring the transfer of CO 2 , increasing their diffusion differences in pore channels and leading to the CO 2 /C 2 H 2 kinetic selectivity of 31.97. Grand canonical Monte Carlo (GCMC) simulation demonstrates that the CO 2 distribution in K-5A- β is significantly higher than that of C 2 H 2 . Dynamic breakthrough experiments verify the excellent performance of material in practical CO 2 /C 2 H 2 separation, for CO 2 /C 2 H 2 (50/50 and 1/99, V/V) mixtures can be separated in one step, thus directly generating high purity C 2 H 2 (> 99.95%), which provides a promising thought for the zeolite-based separation of CO 2 and C 2 H 2 .
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Jiaxi Sui,Dongdong Liu,Chunyu Wang,Lijuan Wang,Bo Zhong,Yuanyuan Ma
Non-metallic Surface-Enhanced Raman Scattering (SERS) substrate materials with unique structures are considered as promising candidates for detection of dyes in the environment. In this work, a sea urchin-like K 2 Ti 8 O 17 (KTO) nanomaterial was prepared by a facile and efficient hydrothermal method . The enhancement factors of the sea urchin-like KTO for crystal violet and methylene blue are 3.8 × 10 5 and 2.45 × 10 5 respectively, and the minimum detection limits of both can reach 10 −8 M, which means the sea urchin-like KTO a promising non-metallic SERS substrate for detecting dyes in the environment. The excellent SERS performance of the sea urchin KTO was attributed to the excellent charge transfer and probe adsorption capability of KTO by energy band and zeta potential analysis. Finally, the excellent application potential of the sea urchin KTO was verified by simulating a practical use scenario.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 11
·4954-4969
·
IF 4.5
Zhang Huan,He Jing,Xiong Yuanyuan,Mu Huaixuan,Deng Yiqing,Zhao Qiang
Carbon dots have attracted much attention in the field of antibacterial because of their good biocompatibility, easy preparation, and basically not inducing bacterial resistance. At present, studies have shown that many antibacterial carbon dots have high positive surface potential, but few researchers have been carried out on how to design carbon dots with high positive surface potential by using nontoxic precursors. In this paper, three structurally similar amino acids with different isoelectric points were selected as carbon sources, and three kinds of carbon dots based on amino acid were synthesized with hydrothermal method. The structural characteristics of the three carbon dots were characterized by XRD, FT-IR, XPS, etc. The content of nitrogen-containing groups of the three carbon dots was compared with the Kaiser test. The relationship between the Zeta potential and the antibacterial effect was also investigated. And it shows that the arginine carbon dots, which have the highest positive charge, also have the best antibacterial performance. So, the arginine carbon dots were further doped with nitrogen-containing molecules (diethylenetriamine, DETA) to obtain high surface positive potential carbon dots (named DETA-Arg-CDs, Zeta potential = + 21.7 mV) with the minimum inhibitory concentration (MIC) against E. coli and S. aureus being 8 and 4 ug/mL, respectively. The antibacterial mechanism of high surface positive potential carbon dots was demonstrated by a series of experiments and computational simulations. Cytotoxicity tests showed that the carbon dots were almost nontoxic within the range of antibacterial concentration. Finally, it was applied to the preparation of antibacterial masks. The bacteriostatic zone experiment showed that the mask sprayed with DETA-Arg-CDs had an obvious bacteriostatic zone, while the blank control group had no bacteriostatic zone. In summary, this study synthesized carbon dots with excellent antibacterial properties by using simple and safe amino acids and small nitrogen-containing molecules and explored the antibacterial mechanism of carbon dots with high surface positive charge.
研究领域:
材料科学
·
微生物学
·
生物医学工程
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）