Recent Patents on Nanotechnology
·
2020
·Vol. 14
·期 1
·46-55
·
IF 0.977
Liu Zhi,Zhou Lei,Ruan Fangtao,Wei Anfang,Zhao Jianghui,Feng Quan
Background: Nanofiber’s productivity plagues nanofibrous membranes’ applications in many areas. Herein, we present the needle-disk electrospinning to improve throughput. In this method, multiple high-curvature mentals are used as the spinning electrode. Methods: Three
aspects were investigated: 1) mechanism elucidation of the needle-disk electrospinning; 2) parameter optimization of the needle-disk electrospinning; 3) productivity improvement of the needle-disk electrospinning. Results: Results show that high-curvature electrode evokes high electric
field intensity, making lower voltage supply in spinning process. The needle number, needle length and needle curvature synergistically affect the spinning process and nanofiber morphology. Additionally, higher disk rotation velocity and higher voltage supply can also result in higher nanofiber’s
productivity. Conclusion: Compared with previous patents related to this topic, the needle-disk electrospinning is featured with the merits of high throughput, low voltage supply, controllable spinning process and nanofiber morphology, benefiting the nanofiber practical industrial employment
and further applications of nanofiber-based materials.
研究领域:
材料科学
·
纳米技术
·
工程学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2016
·Vol. 52
·期 4
·1823-1830
·
IF 2.302
Liu Zhi,Ang Koon Keong Jeremy,He Jihuan
Point discharge is a natural phenomenon which principle and application are both under active investigation. In this work, a needle-disk electrode spinneret was designed through the combination of the point discharge concept and the merits of typical needleless electrospinning (disk as spinneret). The desired outcome for point electrode system is to produce a controllable process of jet formation, with respect to the control of jet site and amount of jets under a lower applied voltage value. Two comparisons were used: (i) in comparison to the typical needleless electrospinning method (disk electrospinning), the needle-disk electrospinning produce finer and more uniform nanofibers. Further numerical simulation results confirmed that the needle-disk electrode induced electric field intensity which is 5.33 times higher than that of disk electrode under the same parameters; (ii) both the numerical simulation and experimental results showed that needle-disk electrospinning can produce competitive quality of nanofibers accompanied by enhanced throughput, compared with the traditional single-needle electrospinning method. Finally, we demonstrate that needle-disk electrospinning produces nanofiber with super-high throughput of 13.5 g/h, which is 183 times higher than traditional electrospinning under similar spinning conditions.
研究领域:
材料科学
·
物理学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry C
·
2024
·Vol. 12
·期 47
·19086-19093
·
IF 5.7
Xiaowei Zhu,Wei Liu,Guobin Zhu,Siyu Xiong,Deqin Chen,Xiuyun Lei,Laijun Liu,Chunchun Li
The present study reports on entropy-engineered perovskite ceramics (Ca1/3Sr1/3Ba1/3)(SnxTi1−x)O3 (CSBTO-xSn) with varying Sn-doping levels (x = 0.1, 0.2, 0.3), achieved through synergistic compositional design in both the A-sites and B-sites of the perovskite. Increasing the Sn-doping content induces a transition in configuration entropy from medium to high values. Notably, at an optimal composition of x = 0.1, the ceramic exhibits exceptional energy storage characteristics including an ultrahigh recoverable energy density (Wrec) of 5.05 J cm−3 and a high efficiency (η) of 82.56% at an electric field strength (Eb) of 540 kV cm−1 over a wide temperature range spanning from 30 to 100 °C and frequencies ranging from 1 Hz to 200 Hz. Furthermore, this ceramic demonstrates remarkable charge–discharge properties with a discharge energy density (Wdis) of 2.94 J cm−3 and a rapid discharge rate of t0.9 ∼ 67 ns. This study underscores the effectiveness of entropy engineering as a viable approach for developing advanced energy storage capacitors.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
JOURNAL OF PHYSICAL CHEMISTRY B
·
2020
·
IF 2.857
Xin Huang,Limin He,Xiaoming Luo,Ke Xu,Yuling Lü,Donghai Yang
Enhancing the electric field strength can facilitate the approach of droplets and the drainage of liquid film. However, two droplets do not coalesce but bounce off after contact under an excessively high electric field strength. To reveal the underlying mechanism, the dynamic behaviors of two free droplets suspended in low-viscosity silicone oil under a DC electric field were investigated herein. Three distinct behavior modes were successively observed by a high-speed camera with the increase in electric field strength: coalescence, partial coalescence, and noncoalescence. The mechanisms and key criteria of partial coalescence and noncoalescence were explored by studying the competition between electric force and interfacial force. The theoretical formula of critical electric field strength for droplet coalescence was derived and validated by experiments. The results indicated that the electric capillary number Ca can be used as the criterion to identify the behavior modes of two free droplets. The droplets undergo partial coalescence or noncoalescence when Ca > 0.11; otherwise, the droplets experience coalescence.
研究领域:
物理学
·
流体力学
✓ 已验证
DOI
PubMed
高影响因子
CHEMOSPHERE
·
2021
·
IF 7.086
Saiguo Yang,Jingqiu Sun,Kun Wu,Chengzhi Hu
Electrocoagulation (EC) is an efficient technology for removing oil-in-water (O/W) emulsions. However, the role of the electric field in EC for demulsification remains unclear and an obstacle for improving reactor design and operation. Herein, demulsification and oil removal performance by EC under different electric field conditions were investigated. Increasing the EC electric field intensity was beneficial for oil removal, and tandem EC had a higher electric field intensity than parallel EC under the same current density. When the current density was 0.67 mA cm −2 , the chemical oxygen demand (COD) removal rates of tandem EC and parallel EC were 1 136.47 and 745.99 g COD kWh −1 , respectively. Oil droplets were polarized by the electric field, and then aligned and aggregated parallel to the direction of the electric field. Increasing electric field intensity accelerated the aggregation of oil droplets, as verified by physical fluid simulation. Furthermore, results showed a higher Al 3+ dosage and larger electric field intensity in EC with increasing current density, which was conducive to oil droplet demulsification. These findings provide insight into and a theoretical basis for improving oil removal by EC processes .
研究领域:
环境科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Ziquan Wang,Ping Ye,Zhujie Liang,Zengye Chen,Fengcheng Yang,Yoshio Bando,Libo Deng
With the widespread application of nuclear energy, the risk of radioactive wastewater containing Sr 2+ is increasing. Flow-electrode capacitive deionization (FCDI) based on carbonaceous materials is an emerging desalination technique with great promise for treating micro-polluted Sr 2+ wastewater. However, understanding of the key factors that govern the performance is still lacking due to complex mass and electron transfer across multi-scales. Herein, we elucidated the influence of the electric-, concentration- and heat- fields on the deionization performance in FCDI, through which a strategy to enhance the performance for selective removal of Sr 2+ was developed. Such a strategy was fulfilled by first constructing flowing electrodes using two types of one-dimensional carbon nanomaterials with similar pore structure but differ significantly in electrical conductivity. By optimizing properties of the flowing electrode and operation conditions, the driving forces originated from electric-, concentration- and heat-fields were enhanced, delivering a high removal rate of 5.29 μg SrCl 2 cm −2 min −1 and a low energy consumption of 2.89 J g −1 SrCl 2 . The effects of field strength unraveled and the FCDI system constructed in this study would pave the way for practical applications of this technology.
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
CHEMICAL ENGINEERING SCIENCE
·
2023
·
IF 4.7
Donghai Yang,Huayao Sun,Mofan Li,Qing Li,Xuedong Gao,Chaohui Chen,Limin He
Under high-strength electric fields, partial coalescence may occur, thus producing fine secondary droplets, which are undesirable for separating water from oil. In this study, experimental and numerical methods are employed to investigate the coalescence behavior under a DC electric field to comprehensively understand the effect of electric field strength ( E ) and droplet diameter ( D ) on coalescence. The Level-set method is employed to capture the moving interface, and the numerical data are validated through experimental tests. The results reveal the easy formation of secondary droplets with increasing E and D values. In particular, the electric field strength suppresses the expansion of the liquid bridge and hinders the vertical collapse of the droplets. The distortion of the electric field at the liquid bridge and the polarized charge both increase with E , thus resulting in stronger electric field repulsion. Moreover, the enhancement in D significantly affects the shrinkage of the liquid bridge and prevents the vertical collapse of the droplet. The pressure gradient at the liquid bridge from the outside to inside decreases as a function of D , thereby inhibiting the contraction speed. Furthermore, the number of polarized charges concentrated on the top of the droplet increases, thus resulting in an enhanced electric field tension. The results obtained herein can potentially act as guide for the design and optimization of electric dehydrators.
研究领域:
物理学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Mao Gao,Fan Tang,Yongchao Zhao,Yixuan Chu,Yan Yang,Guangming Tian,Yanlong Wang,Huaqing Liu
The characteristics of soil pore structure response to electric field strength and their effects on the migration of hexavalent chromium during electrokinetic remediation remain unclear. This paper investigates the effects of soil actual voltage and pore redistribution on hexavalent chromium removal under various voltage gradients during electrokinetic remediation. The electric field across the soil was the dominant factor that affected the soil properties, pore structure, and transportation of hexavalent chromium. The removal efficiency of dissolved hexavalent chromium was significantly enhanced from 36.1 % to 80.5 % as the theoretical voltage gradients increased from 0.5 V·cm −1 to 3 V·cm −1 due to the highest voltage proportion (52.7 %) of the soil chamber at 3 V·cm −1 , while it only increased to 82.0 % at 4 V·cm −1 . The optimal actual electric field strength of 1.00–1.50 V·cm −1 across the soil matrix facilitated the efficient electromigration of hexavalent chromium. The electric field force exerted a direct (0.70) or indirect action intensity (1.55) on soil pore structure by altering soil chemical properties. Soil mesopores and ultra-micropores transformed into micropores through collapsing, shrinking, ion migration, weakening electrostatic repulsion, and enhancing adhesive bonding among particles with increasing electric field. The distribution and structure of soil pores were more homogenous under optimal electric field conditions, thereby improving the migration path of hexavalent chromium. Soil mesopores facilitated hexavalent chromium removal and the formed micropores were opposite. These findings have significant scientific and practical implications for applying the in-situ electrokinetic techniques in the remediation of metal-contaminated soils.
研究领域:
环境科学
·
土壤学
✓ 已验证
DOI
高影响因子
Plasmonics
·
2015
·Vol. 11
·期 4
·1119-1128
·
IF 2.238
Pang Kai,Dong Wei,Zhang Bing,Zhan Shuyue,Wang Xiaoping
We demonstrate that a designed bimetallic chip is capable of improving the performance of a surface plasmon resonance (SPR) sensor based on angular interrogation. Through a numerical simulation and a refractometry experiment, we prove that this bimetallic chip can effectively reduce the noise level by about a factor of 2 compared to the traditional SPR sensors that only use a single gold film. The bimetallic chip presents a lower refractive index resolution of 5.3 × 10 −7 refractive index units. In addition, the enhancement of the electric field intensity at the surface of the configuration by a factor of 2 makes it possible to have a high sensitivity in a larger region, which promotes the biosensing applications of the chip. Through a simple and novel method for the detection of cadmium ions (Cd 2+ ) based on the bimetallic configuration, a detection level for Cd 2+ (0.01 μM or 1.12 ppb) can be realized, which compares favorably with similar studies.
研究领域:
分析化学
·
生物传感技术
✓ 已验证
DOI
高影响因子
Chemical Engineering and Processing-Process Intensification
·
2023
·
IF 4.3
Kai Guo,Ling Du,Yuling Lü,Limin He,Xiaoming Luo,Yin Bai
Shale oil is highly mineralized by salt ions, which makes it difficult to demulsify and dehydrate. The synergistic electromagnetic field (EMSF) is a more efficient method than AC electric field (ACEF) to enhance Shale oil dehydration. However, the critical coalescence conditions and transformation mechanism of droplets dispersed with electrolyte ions in EMSF still lack research. Herein, a series of Na 2 CO 3 -dispersed droplets with different ionic strengths were prepared, and the critical coalescence electric intensity ( E c ) of the droplets under ACEF and EMSF were compared. Micro high-speed experiments revealed that E c of droplets under EMSF is higher. Under the action of both EMSF and ACEF, E c decreases with the increase of ionic strength I s . An ion enrichment theory is proposed to explain the relationship between ion strength and potential energy. This study provides technical guidance for the performance regulation of EMSF-based equipment to enhance oil-water separation, the allowable optimal voltage should be higher than that of the electrostatic coalescer, and the adjustment range is 3.81 %–5.88 %.
研究领域:
石油工程
·
电化学
✓ 已验证
DOI
高影响因子
Advanced Materials Interfaces
·
2022
·Vol. 9
·期 28
·2201100
·
IF 6.389
Xiangping Ding,Zhongbin Pan,Yong Zhang,Songhan Shi,Yu Cheng,Hanxi Chen,Zhicheng Li,Xu Fan,Jinjun Liu,Jinhong Yu,Jiwei Zhai
Dielectric materials with excellent high-temperature energy storage performances are urgently demanded in advanced electronic market. However, the sharply reduced energy storage capabilities caused by conduction loss impede the applications of polymer-based nanocomposites at harsh environments. In this work, the 2D hybrid structure fillers of boron nitride nanosheets-titanium dioxide (BNNSs-TiO 2 ), where TiO 2 nanoparticles tightly wrap around the 2D BNNSs, are fused with polyetherimide (PEI) forming polymer nanocomposite films. The finite element simulation and experiment results indicate that the hybrid structure 2D BNNSs-TiO 2 can effectively regulate local electric field strength and interfacial polarization, facilitating the enhancement in energy storage properties. Accordingly, the composite film delivers a superior discharged energy density (≈4 J cm −3 ) and charging/discharging efficiency (≈90%) at 150 °C, better than recently discussed high-temperature pristine polymer and their composite films. This contribution offers a feasible idea to explore reliable dielectric capacitors at high temperature.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
Smart Materials and Structures
·
2020
·Vol. 29
·期 2
·025009
·
IF 3.613
Chenguang Niu,Xufeng Dong,Yuan Lan,Linkai Niu,Xiaoyan Xiong,Bin Zhao,Min Qi
The creep and recovery behaviors are of great importance for the electrorheological elastomers (EREs), while it is lack of relevant research in previous reports. In this work, the creep and recovery properties of silane coupling agent modified-TiO2 particles based EREs were systematically investigated, and the influence of particle content, electric field strength and temperature on creep and recovery behaviors were analyzed. The results indicate the creep and recovery behaviors of the EREs are affected by particle volume fraction and temperature obviously. The creep resistance of EREs are enhanced with the ascending electric field strength, and the blocking effect of particles on polymer chain segments is further clarified by fitting the creep data with Findley and Burgers model. The creep compliance curves of the EREs under various temperatures and electric field intensities were compared, and the curves were shifted along time axis to get a master compliance curve at a reference electric field strength according to the proposed time-electric field superposition principle (TESP). It is shown that TESP could provide an accelerated measuring technique for evaluating the long-term viscoelastic properties of EREs.
研究领域:
材料科学
·
力学
✓ 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）