Journal of Physical Chemistry C
·
2020
·
IF 4.189
Jin Wang,Fudi Wang,Bing Yang,Jiang Wu,Mengtao Tian,Jiani Zhu,Xudong Wang,Lei Wang
A lamellar membrane assembled by parallel restacking of two-dimensional nanosheets provides a novel platform for studying the electrostatic manipulation of ion mobility under angström-scale confinement. The membrane nanostructure in aqueous solution is unstable due to intercalation. However, because accurate measurements of structural changes under different charged conditions are difficult, their effect on the ion modulation was seldom fully addressed, and the electrostatic modulation mechanism was not good. Here, we report the efficient manipulation of ion diffusion in the confined channels through a Ti3C2Tx membrane and gain insight into the mechanism by an in situ measurement of the lamellar nanostructure using an electrochemical quartz crystal microbalance with dissipation (EQCM-D). By precisely tuning the external potential directly applied to the membrane, the ion permeation rate can be effectively and reversibly increased by 6 times or decreased by 15 times. The EQCM-D measurement provides empirical evidence to demonstrate that the anomalous ion-flow modulation is determined by both the channel diameter and an ion rearrangement in the electrical double layers (EDLs), particularly, in the Stern layers. Although the channel expanded at low negative voltage, the ion permeation rate decelerated due to the counterion distribution in the Stern layers.
研究领域:
材料科学
·
物理化学
✓ 已验证
产品关联
DOI
高影响因子
Surfaces and Interfaces
·
2024
·
IF 5.7
Haoxiong Cui,Zhong Lin,Kelin Zhu,Guoan Cheng,Xiaoling Wu,Ruiting Zheng
The comprehensive investigation was conducted to analyze the corrosion behavior and surface potential of pure copper surfaces in various acidic solutions. We carried out Zeta potential measurement, electrochemical measurement and in situ Raman spectroscopy to investigate the corrosion process and surface potential of copper in acidic solutions with different pH. It was found that the variation in zeta potential with pH corresponds to the corrosion behavior of copper during this process. In 1mmol / L aqueous chloride media, when the pH is greater than 3.5, unalloyed copper is oxidized to monovalent copper. At this stage, as the pH decreases, the zeta potential gradually increases. When the pH reaches 3.5, the Zeta potential reaches the highest, and the rate of cuprous oxide formation reaches the maximum. When the pH continues decrease, unalloyed copper begins to be oxidized to divalent copper, and the zeta potential will also decrease, the surface charge state shifts to the positive direction. Furthermore, our experimental findings are complemented by Density Functional Theory (DFT) calculations.
研究领域:
材料科学
·
电化学
·
表面科学
✓ 已验证
DOI
高影响因子
Nano Energy
·
2021
·
IF 17.881
Nannan Wang,Yange Feng,Youbin Zheng,Feng Zhou,Daoai Wang
The tribocharges generated by the friction of the polymer material are temporarily stored on the interface, which allows the triboelectric nanogenerators (TENGs) to generate electrical output or produce electrostatic discharge on the polymer surface . Therefore, tribocharge regulation on the material surface is of considerable significance to improve the electrical output of TENGs or design new anti-static materials. A new method with universal applicability to control the triboelectrification of interface by photothermal materials is proposed in this study. In this method, the near-infrared (NIR) irradiation will cause the thermo electron emission of Fe 3 O 4 , thereby changing the charge amount on the PDMS surface. Results show that the surface potential of Fe 3 O 4 @PDMS is reduced by 76.8% after NIR excitation when the PDMS surface is positively charged. In addition, the surface potential increases by 42.9% when the surface of Fe 3 O 4 is negatively charged, showing the opposite trend. Moreover, the friction coefficient of the polymer can be adjusted by modifying the surface triboelectricity to change its motion state. This strategy has many interesting applications, such as reducing the friction resistance of skis by reducing the surface charges or increasing the friction resistance by raising the charges on the surface of a car tire, thereby reducing the gliding distance during emergency braking.
研究领域:
材料科学
·
纳米技术
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Bioengineering and Biotechnology
·
2022
·
IF 6.064
Wang Peng,Zhou Xiaosong,Lv Caili,Wang Yu,Wang Zongliang,Wang Liqiang,Zhu Yongzhan,Guo Min,Zhang Peibiao
The endogenous electrical potential generated by native bone and periosteum plays a key role in maintaining bone mass and quality. Inspired by the electrical properties of bone, different negative surface potentials are built on microspheres to restore electric microenvironment for powerful bone regeneration, which was prepared by the combination of strontium-doped barium titanate (Sr-BTO) nanoparticles and poly (lactic-co-glycolic acid) (PLGA) with high electrostatic voltage field (HEV). The surface potential was modulated through regulating the phase composition of nanoparticles in microspheres by the doping amount of strontium ion (Sr2+). As a result, the 0.1Sr-BTO/PLGA group shows the lowest surface potential and its relative permittivity is closer to natural bone. As expected, the 0.1Sr-BTO/PLGA microspheres performed cytocompatibility, osteogenic activity in vitro and enhance bone regeneration in vivo. Furthermore, the potential mechanism of Sr-BTO/PLGA microspheres to promote osteogenic differentiation was further explored. The lower surface potential generated on Sr-BTO/PLGA microspheres regulates cell membrane potential and leads to an increase in the intracellular calcium ion (Ca2+) concentration, which could activate the Calcineurin (CaN)/Nuclear factor of activated T-cells (NFAT) signaling pathway to promote osteogenic differentiation. This study established an effective method to modulate the surface potential, which provides a prospective exploration for electrical stimulation therapy. The 0.1Sr-BTO/PLGA microsphere with lower surface potential and bone-matched dielectric constant is expected to have great potential in the field of bone regeneration.
研究领域:
生物材料学
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骨组织工程
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细胞生物学
✓ 已验证
DOI
PubMed
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2020
·
IF 6.551
Changsheng Guo,Haiting Shi,Wei Wang,Xiaoyuan Pei,Kunyue Teng,Yanli Hu,Zhiwei Xu,Hui Deng,Xiaoming Qian
Electret treatment was a simple method to enhance the charge-electrode properties of polyvinylidene fluoride (PVDF) materials due to the increase of space charge and polarization charge of PVDF materials. The polarization charge was due to the electric dipole orientation change in loose nanofiltration PVDF membrane, which increased the electric dipole moment and improved the polarity of surface potential. Importantly, electret charges were less affected by ambient humidity. Therefore, the electret treatment could improve the surface negative potential of loose nanofiltration PVDF membrane, so as to improve its anti-fouling performance under certain conditions. Based on the above theoretical analysis, the influence and mechanism of the electret treatment on the surface potential, morphology, structure, hydrophilicity and anti-pollution performance of PVDF membrane were studied in this manuscript. When the electret time was 7.5 min and the electret voltage was 30 kV, the surface negative potential was the highest. The content of β phase crystals was 39.1%, which was 12.18% higher than that of untreated membrane. In addition, the surface morphology of PVDF membrane did not change significantly, but the water contact angle decreased slightly, and the pore size increased by 0.36–0.75 nm. Importantly, the flux and the rejection of dye and BSA increased to some extent, and the maximum rejection rate and water flux were increased by 10.34% and 20.25%, respectively. Through the cyclic filtration test and analysis, the anti-fouling performance of membrane was increased due to electrostatic repulsion.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Chunxia Pang,Changhong Yu,Lili Liang,Zhanguo Li,Xiaoyan Lin,Xunhai Pan,Yang Hu,Yaping Zhang
The properties, electret property and purification performance, of electret filter materials are closely associated with its pore structure , but the effect mechanism of pore structure on its electret property has not been clarified. Herein, the pore structure of 3D electret fiber materials which were prepared by freeze-drying technology and corona polarization technology based on dialdehyde cellulose nanofibers (DAMCC) and ethyl cellulose nanofibers (EC) was regulated by changing the DAMCC/EC mass ratio, solvent system, pre-freezing temperature and fiber concentration to explore the influence of pore structure on its electret properties and purification performance. The results show that the charge trapping and storage properties can be altered by the regulation of pore structure, and the 3D fiber material, prepared under the conditions of DAMCC/EC nanofiber mass ratio of 1/2, TBA content of 10 %, pre-freezing temperature of −40 °C and fiber concentration of 1.5 w/v%, presents a cellular porous structure with a complete fiber mesh wall. This structure is not only beneficial to the migration of space charge to the interior of the fiber material, but also can effectively prevent the escape behavior of space charge inside the material by extending the tortuous pore channel length, thereby improving the initial and stable surface potentials from 0.72 kV and 0.02 kV to 1.19 kV and 0.47 kV respectively. Moreover, the purification time of 3D electret fiber materials can be reduced from 51 min to 13 min owe to the improvement of electret property and pore structure. These will provide guidance for the investigation of pore structure regulation to alter the properties of electret fiber material for air purification .
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2024
·
IF 8.4
Juexin Wang,Yangxiang Huang,Lixin Xue,Xinqi Gu,Jing He,Yeqiang Lu,Congjie Gao
Cross substrate interface polymerization (CSIP) processes were developed to construct polyethylene (PE) based thin film composite nanofiltration (NF) membranes with internally confined polyamide (i-PA) separating layers protected by external covering PE filaments, possessing rougher top surfaces, more negative surface zeta potential, reduced and narrowly distributed pore sizes. Cationic surfactant CTAB reacted with TMC and formed hydrophilic but insoluble BTC(CTA) n /CTAB coating inside the PE substrate to facilitate water permeation. The contact time of monomer solutions on PE substrates affect the membrane performance by controlling the quality of i-PA layers and amount of BTC(CTA) n /CTAB coating underneath. PE(O/W) NF membranes from CSIP processes with i-PA layers had rougher surface, lower zeta potential, smaller average radius μ p (0.374 nm) and lower geometric deviation (1.43), leading to higher Na 2 SO 4 rejection (96.4 %) and water permeance (20.36 L m −2 ·h −1 ·bar −1 ), maintaining excellent anti-wearing, flux recovering and operating stability.
研究领域:
材料科学
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环境工程
✓ 已验证
产品关联
DOI
高影响因子
POWDER TECHNOLOGY
·
2024
·
IF 4.5
Yuan Yuan,Weiquan Zhan,Alejandro Lopéz Valdivieso,Songliang Ma,Yang Tian,Hao Yi,Guangfeng Dong,Shaoxian Song,Luis A. Cisternas,Feifei Jia
Sylvite (KCl) is a classical soluble mineral with high solubility, endowing the possibility to precisely adjust its surficial structure for flotation recovery. In this work, efforts have been originally made to study flotation behaviors of KCl with (200) and (222) exposing facets. KCl(200) crystals had a higher recovery than that of KCl(222) with octadecylamine hydrochloride (ODA). FTIR and XPS results indicated that interaction force between KCl and ODA was not chemical absorption . Zeta potential results further implied the mechanism that the ODA reacted with KCl by static force and KCl(200) possessed a lower potential than KCl(222) and thus facilitated the flotation process. 2D as well as 3D AFM results provided microscopic details of perfect cubic KCl(200) and octahedron KCl(222) samples where layered growing method of former samples exhibited more edges with hanging Cl bonds, leading to its more negative surficial potential and less hydrophilic property , enhancing flotation recovery. Moreover, adhesion & adsorption force further illustrated that KCl(200) obtained a stronger interaction with bubbles, in coincidence with its better flotation recovery. KCl crystals with (200) exposing faces promoted flotation in comparison with crystal with (222) faces, offering strategy to reserve (200) faces for designing KCl crystals with high recovery.
研究领域:
矿物加工工程
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材料科学与工程
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Haipeng Xu,Yu Zhuang,Zeyu Fu,Jinjie Cui,Shengjie Jiang,Bin Zhao,Kaili Lin
Rapid bone reconstruction and regeneration process is still a problem to be solved in the clinical orthopedic treatment. In vivo electric stimulation (ES) shows great promise in repair and regeneration of damaged tissues, and the piezoelectric characteristic of nature bone tissue make the electrical activity piezoelectricity biomaterials feasible and attractive in bone regeneration. Herein, we prepared a biocompatible lead-free piezoelectric ceramic K 0.5 Na 0.5 NbO 3 (KNN) via solid phase sintering, which possesses wireless ES capability through corona discharge poling. Compared with the traditional piezoelectric ceramic polarization methods, corona discharge poling is a non-contact and biologically safer electrical poling method without electrodes or insulating liquids. The results of piezoelectricity, the water contact angle, the protein adsorption, surface potential characteristics of KNN ceramics and bone mesenchymal stem cells (BMSCs) behavior on ceramics, showed that after corona discharge poling the surface of KNN piezoelectric ceramic became hydrophilic, and positively charged, and the electrostatic effect formed by these charges promoted protein adsorption and BMSCs attachment and proliferation, which further promoted osteogenic differentiation. In conclusion, we used the corona discharge to polarize KNN piezoelectric ceramics and excellent biocompatibility of the ceramics was maintained after poling. Meanwhile, our work demonstrated the potential application of piezoelectric bio-ceramic materials in bone regeneration.
研究领域:
生物材料学
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骨科医学
·
细胞生物学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Ling-Zhi Huang,Yan Ding,Dan-Dan Li,Ming-Guo Ma
Cellulosic triboelectric materials have gained widespread attention in triboelectric nanogenerators (TENGs) recently due to their fascinating merits of renewability, biodegradability, and low cost. However, cellulose-based TENGs still are challenged by the low surface charge density of triboelectric materials. Herein, the negative charged cellulosic triboelectric materials are functionalized as triboelectric layers for self-powered sensors via an electrostatic spinning method, where the electrospun polyvinylidene fluoride (PVDF) nanofibers fill with the porous air-laid paper (AP), boosting the formation of polar β-phase crystals and a negative shift of the surface potential. The TENG constructed with PVDF/12 wt%@AP affords charge output of 60.7 μC m −2 and power output of 233.28 mW m −2 , and the as-prepared contact self-sensor presents unparalleled sensitivity of 6.20 V kPa −1 under pressures from 1.23 kPa to 5.0 kPa. In addition, we design the non-contact self-powered sensor, capable of recognizing different objects and accurately detecting human movements like walking, running, and jumping. Notably, the TENGs can also be used as a wireless sensor terminal for smart devices to provide convenient sensing functions. This β-phase cellulosic materials are a step toward wearable self-powered sensor systems that are durable to capture mechanical energy from the environment.
研究领域:
材料科学
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生物医学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Friction
·
2022
·Vol. 11
·期 4
·513-523
·
IF 4.924
Gao Tianyang,Li Jinjin,Wang Weiqi,Luo Jianbin
An extremely low friction state was observed on the gold surface induced by applying a specific negative potential in cationic surfactant solution. The friction force showed a remarkable reduction from 8.3 to 3.5 × 10 −2 nN (reduced by 99.6%) with increasing the period of negative applied potential, and the final friction coefficient could reduce down to 3 × 10 −4 . The extremely low friction state was robust, and it also exhibited an excellent load bearing capacity, which cannot be damaged by a high load. Moreover, the extremely low friction state achieved under negative applied potential could keep stable even after the removal of potential, but failed in a short time, once a specific positive potential was applied. It was demonstrated that there was a stable electro-adsorption of surfactant molecules on the gold surface induced by applying a negative potential, leading to the formation of a bilayer structure on the gold surface. The hydration layers of the bilayer on the gold surface and micelles on the silica probe provided a shear plane with an extremely low shear strength, leading to the extremely low friction state on the gold surface. This study provides a method to achieve extremely low friction state by applied potential.
研究领域:
材料科学
·
界面化学
✓ 已验证
DOI
高影响因子
ACS Applied Polymer Materials
·
2025
·
IF 4.7
Ning Yan,Ting Gao,Li Hua,Fan Xie,Ruixin Liu,Zhaoqing Lu
A highly electrostatic cellulose acetate (CA)-based electret film for air filtration was fabricated by the electrospinning method assisted with the corona charging technique in this work. The highly polar and hydrophobic poly(vinylidene fluoride) (PVDF) was chosen as the electrostatic reinforcement. The results showed that under the dual electric fields, the dipole charges generated from the conversion from a nonpolar α-phase to a polar β-phase of the dipole inside PVDF and the space charge captured at the phase end traps of CA and PVDF give CA/PVDF films high static electricity. Especially, the composite film with 40 wt % PVDF exhibited an ultrahigh surface potential of 2.146 kV and excellent filtration efficiency of 97.27% for PM 0.3 with a pressure drop of only 88.7 Pa, which were 29.68 and 22.04%, respectively, higher than those of the pure CA film. It was noticed that the hydrophobicity and mechanical strength were also improved.
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
危险品化学品经营许可证（带存储）