Materials
·
2022
·Vol. 15
·期 20
·7372
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IF 3.748
Xiaoxiao Zhang,Jun Hou,Wei Xia,Zhian Xu,Pengtao Yang,Anqi Wang,Ziyi Liu,Jie Shen,Hua Zhang,Xiaoli Dong,Yoshiya Uwatoko,Jianping Sun,Bosen Wang,Yanfeng Guo,Jinguang Cheng
RV6Sn6(R= Sc, Y, or rare earth) is a new family of kagome metals that have a similar vanadium structural motif asAV3Sb5(A= K, Rb, Cs) compounds. UnlikeAV3Sb5, ScV6Sn6is the only compound among the series ofRV6Sn6that displays a charge density wave (CDW) order at ambient pressure, yet it shows no superconductivity (SC) at low temperatures. Here, we perform a high-pressure transport study on the ScV6Sn6single crystal to track the evolutions of the CDW transition and to explore possible SC. In contrast toAV3Sb5compounds, the CDW order of ScV6Sn6can be suppressed completely by a pressure of about 2.4 GPa, but no SC is detected down to 40 mK at 2.35 GPa and 1.5 K up to 11 GPa. Moreover, we observed that the resistivity anomaly around the CDW transition undergoes an obvious change at ~2.04 GPa before it vanishes completely. The present work highlights a distinct relationship between CDW and SC in ScV6Sn6in comparison with the well-studiedAV3Sb5.Keywords:ScV6Sn6;charge density wave;high pressure
研究领域:
凝聚态物理
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材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Inorganic Chemistry Frontiers
·
2025
·
IF 6.4
Lijia Zhou,Xiangjiang Dong,Qiang Li,Xianran Xing
We systematically investigated the superconducting properties of 2H-PtxTaS2 (0 ≤ x ≤ 0.08). As the platinum (Pt) content increases, the charge density wave (CDW) in 2H-TaS2, which appears at approximately 75 K, is progressively suppressed and completely disappears in Pt0.06TaS2. Meanwhile, the superconducting transition temperature (Tc) first increases and then decreases, reaching its maximum value of approximately 4.85 K at x = 0.06. This phenomenon suggests a competitive interplay between CDW and superconductivity (SC) in this system. Further measurements of the superconducting parameters of Pt0.06TaS2 indicate that the enhancement of Tc is primarily attributed to an increase in the density of states at the Fermi level.
研究领域:
凝聚态物理
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2019
·
IF 4.784
Junzhu Li,Weiping Jin,Wei Xu,Gang Liu,Qingrong Huang,Zhenzhou Zhu,Shuyi Li,Shuiyuan Cheng
Similarities and differences of assembly for ovalbumin (OVA) and two kinds of sodium alginate (SA1 and SA2) varying in charge densities (λ SA1 : λ SA2 ≈ 2:1) were investigated. The assembly processes of OVA/SA mixtures were characterized by phase diagram, particle size, and microstructure. Two differences between OVA/SA1 and OVA/SA2 mixtures in the phase diagram were distinctly observed. First, due to the higher charge density of SA1, the strong interaction between OVA and SA1 caused only pH φ1 to be recorded. A higher linear charge density of SA1 narrowed the pH φ1 -pH φ2 range at ratios of 2:1 and 1:1. Second, OVA/SA1 complexes formed a coacervate with a relatively strong resistance to ion-induced shielding effects. This maintained the smaller size (tighter structure) with a larger number of complexes in the coacervate without 250 mM NaCl. The regulating polysaccharides with different charge densities could control the soluble region of complexes and endow various size or morphology of the coacervate assembled by proteins and polysaccharides.
研究领域:
食品科学
·
生物化学
✓ 已验证
DOI
高影响因子
ENVIRONMENTAL SCIENCE & TECHNOLOGY
·
2025
·
IF 11.3
Zhiwei Qiu,Hailan Wang,Ruobin Dai,Zhiwei Wang
Silica scaling poses a substantial challenge in the advanced treatment of industrial wastewater by reverse osmosis (RO) membranes, while the existing methods modifying RO membranes to enhance antisilica scaling performance often compromise water permeance. Herein, we fabricated a sulfonated RO membrane (SLRO) using sodium lignosulfonate as a comonomer, achieving an enhanced charge density and reduced coordination capacity. SLRO exhibited superior antisilica scaling performance, reducing scaling rates by ∼145, ∼166, and ∼157% under acidic, neutral, and alkaline conditions compared to the control. Reduced density gradient analysis confirmed that sulfonic acid groups (−SO3H) on the SLRO surface increased the repulsion of silicic acid. Moreover, the SLRO demonstrated reductions of ∼112, ∼137, and ∼133% in cation-mediated silica scaling rates under the same conditions, attributed to the weaker coordination between −SO3H and cations, which diminished the cation-bridging effect. Furthermore, SLRO membranes exhibited high pure water permeance (3.3 L m–2 h–1 bar–1) and NaCl rejection (99.2%), with a water/NaCl selectivity (7.8 bar–1) three times greater than that of the control (2.6 bar–1), primarily attributed to increased surface roughness and reduced apparent thickness of the PA layer. Our work provides a robust strategy for fabricating silica scaling-resistant RO membranes with improved perm-selectivity.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Yueqian Liu,Yu Rong,Yuanjin Zeng,Jiangkai Bao,Zhuqun Shi,Chuanxi Xiong,Quanling Yang
The TEMPO-oxidized cellulose nanofibril (TOCN) is a green, renewable, recycled material with high performance developing natural, environmentally friendly triboelectric materials. However, the performance of natural polymer triboelectric materials needs to be further improved. In this work, a novel high-performance TOCN-based triboelectric material was prepared and enhanced by increasing oxygen-rich groups and porous structure by regulated TEMPO-mediated oxidation and direct freeze-drying process. Oxygen-rich groups and porous structures synergistically boosted the surface charge density of the material during contact separation to enhance the triboelectric output performance. The open-circuit voltage of the triboelectric nanogenerator (TENG) was realized to be enhanced by 36 % and 84.5 %, respectively, with the power density up to 1.003 W/m 2 . Meanwhile, finite element analysis calculations further verified that the oxygen-rich groups help to increase the surface charge density of the material and make electron transfer easier. This study provides a new strategy for preparing high-performance, environmentally friendly, biocompatible biomass triboelectric materials.
研究领域:
材料科学
·
能源与环境科学
✓ 已验证
产品关联
DOI
高影响因子
SCIENCE OF THE TOTAL ENVIRONMENT
·
2019
·
IF 5.589
Siying Tan,Shaojie Jiang,Yangzhou Lai,Qiuhong Yuan
Cationic polymers, which are commonly used as flocculants and coagulant aids in water and wastewater treatment , have been recently reported to promote the formation of nitrosamines . Most of the findings to date are based on poly (epichlorohydrin dimethylamine) and poly (diallyldimethylammonium chloride), while few studies have considered nitrosamines formation of polyacrylamides. In this work, the nitrosamines formation from non-ionic, anionic and cationic polyacrylamides was evaluated. Moreover, the effects of chemical structures of cationic polyacrylamides (including molecular weight , charge density, and monomers) on nitrosamines formation were investigated. The results revealed that the highest amount of nitrosamines formation was formed from cationic polyacrylamide, followed by non-ionic polyacrylamide and anionic polyacrylamide. Molecular weight and various cationic monomers showed no significant effects on nitrosamines formation, but monomers generated significantly higher amount of nitrosamines formation than cationic polyacrylamides. Nitrosamines formation increased with the increasing charge density of cationic polyacrylamides, and FTIR analysis results showed that the quaternary amine groups preferentially reacted with chloramines than with amide groups. This work shed new light on the nitrosamines formation from water and wastewater treatment polymers.
研究领域:
环境科学
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水处理工程
✓ 已验证
DOI
PubMed
高影响因子
NANO LETTERS
·
2025
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IF 9.1
Wei Deng,Yufeng Zhu,Kelan Zhang,Yuxuan Yuan,Tao Hu,Xiao Wang,Jidong Li,Xuemei Li,Zhuhua Zhang,Wanlin Guo,Jun Yin
Collective behavior enables groups of organisms to achieve feats far exceeding individual capability. Inspired by this, we present a novel droplet-based electricity generator that leverages the collective dynamics of multiple water droplets to significantly enhance electrical output, achieving orders of magnitude improvement compared with single-droplet devices. It is revealed that grouped water droplets, although spatially separated, coordinate via charge exchange with a solid surface and external charge transfer. Consequently, the solid surface charge density is significantly enhanced, elevating the charge transfer. This collective effect readily generates peak voltages exceeding one kilovolt, sufficient for air ionization and nitrogen fixation, with potential applications in nutrient production. We anticipate that this collective strategy will significantly advance the design and applications of droplet-based hydrovoltaic devices.
研究领域:
能源科学
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材料科学
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物理学
✓ 已验证
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Xueping Yu,Zhongzhe Liu,Xiya Yang,Yudi Wang,Jihua Zhang,Jialong Duan,Liming Liu,Qunwei Tang
Triboelectric generators (TENGs) have been extensively studied as a new energy for low cost and the universally applicable prospect. Meanwhile, perovskites have been applied in TENG and show a good performance in view of high carrier mobility, long life and dielectric properties. The asymmetry structure of the orthogonal phase CsPbBr3 perovskite endows it with ferroelectric property and induces the misalignment of the positive and negative charge centers. Herein, the surface energy of halogen doped inorganic CsPbX3 (X = Cl–, Br–) perovskites are theoretically investigated by density functional theory (DFT) calculation, the crystal polarizability of pristine CsPbBr3 is improved from 0.47 Ry a.u. to 0.52 Ry a.u. (CsPbCl3), indicating the polarizability of CsPbCl3 is higher than CsPbBr3. In addition, the build-in electric field (Ebuild-in) of perovskite materials can be enhanced by the spontaneous polarization and the aligned dipoles in the Ebuild-in could further improve the tribo-electrostatic electric field by retaining more triboelectric surface charges. In the end, CsPbCl3 achieved a power of 3.06 W m–2 compared to the power of 1.34 W m–2 of CsPbBr3. This work focuses on the regulation of crystal planes using spontaneous polarization of perovskite toward achieving a high built-in electric field for enhancing triboelectric surface charge density.
研究领域:
材料科学
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能源技术
·
物理学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 24
·11966-11975
·
IF 11.301
Guixiang Xie,Xiya Yang,Jialong Duan,Yanyan Duan,Qunwei Tang
Triboelectric nanogenerators (TENGs) have attracted growing attention because they are advanced energy conversion devices to efficiently harvest low-frequency mechanical energy from nature. How to increase the permittivity of electrode materials as well as the surface charge density is technically important to improve the output performances of a robust TENG. In this study, an all-inorganic cesium lead bromide (CsPbBr3) perovskite film with semiconducting characteristics is combined with metallic nano-platinum to build bulk Pt/CsPbBr3 Schottky junctions, which are used as triboelectric electrode materials in vertical contact-separation perovskite TENGs. The systematic characterization demonstrates that the electron binding energy and dielectric properties of bulk Pt/CsPbBr3 Schottky junction tailored perovskite films are maximized by optimizing the Pt dosage. An open-circuit voltage of 273 V, a short-circuit current density of 30.3 μA cm−2 and an instantaneous maximum power density of 1295.5 mW m−2 are achieved by the champion Pt/CsPbBr3 TENG at a Pt dosage of 0.5%. A maximum energy storage of 3.96 mJ is stored in a 1 μF capacitor within a 300 s charging period. This work provides new insights into Schottky junction TENGs for enriching the fundamental principles of both halide perovskites and TENGs.
研究领域:
材料科学
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能源技术
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Guifang Wang,Jiangqi Wei,Guangchuan Liang,Yanli Chen,Shaojian Ma,Jinliang Zhu,Haiyan Liu
Montmorillonite (Mt) is widely used in various fields due to its abundant resources and excellent adsorption performance, while the hydration and adsorption properties of raw or functionalized Mt are affected by its intrinsic property, layer charge density (LCD). Herein, a series of reduced-charge montmorillonites (RC-Mt) with high, medium, and low layer charges were prepared by the method of lithiation and microwaving Ca-Mt. Meanwhile, the effects of artificially regulated layer charge density on Mt’s structure, hydration properties, and the removal ability of aqueous anions by the poly (diallyl dimethylammonium chloride) functionalized Mt (PDDA-Mt) were also investigated. Results showed that the LCD of Mt decreased with the increasing microwave time or power. In addition, the physicochemical properties of RC-Mt which included cation exchange capacity (CEC), colloidal index, and swelling properties decreased as the LCD decreased. Furthermore, the adsorption capacity of Mt for NO 3 - was significantly improved following the PDDA functionalization. The kinetic modeling suggests that the Pseudo-first-order model better characterized the adsorption of Ca-Mt and Li-Mt than the Pseudo-second-order model. On the other hand, the good fit of the Pseudo-second-order model implied that the adsorption process of nitrate on RC-Mt and PDDA-Mt is mainly driven by chemisorption control. The adsorption thermodynamics indicated that the adsorption process was spontaneous. Furthermore, the FTIR and XPS results suggested that in addition to diffusion and electrostatic interactions, the adsorption mechanism of PDDA-Mt was mainly attributed to the ion exchange between chloride and nitrate on the quaternary ammonium group of PDDA.
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
JOURNAL OF MEMBRANE SCIENCE
·
2022
·
IF 10.53
Tianrun Gu,Runnan Zhang,Shiyu Zhang,Benbing Shi,Junhui Zhao,Zhen Wang,Mengying Long,Guangzhe Wang,Ting Qiu,Zhongyi Jiang
The efficient separation of Li + /Mg 2+ is the key to lithium extraction from salt lake brine. Herein, a multi-amino quaternary ammonium salt (3,5-dimethylhydrazide-benzyl trimethyl ammonium bromide, DHTAB) was designed and synthesized to modify pristine polyamide (PA) nanofiltration membranes. DHTAB was grafted on the surface of the PA nanofiltration membrane to construct a positively selective layer for Li + /Mg 2+ separation. The introduction of DHTAB increased the membrane surface charge density to +5.16 mC m −2 , which was nearly three times that of the pristine PA membrane. The increased charge density of the modified membrane led to a stronger Donnan exclusion for Mg 2+ , and accordingly a high MgCl 2 rejection of 99.2%. The modified membranes exhibited a high Li + /Mg 2+ separation factor of up to 60.1, when applied for MgCl 2 and LiCl binary solution, which exceeded all known PA-based nanofiltration membranes.
研究领域:
材料科学
·
化学工程
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
Matter
·
2025
·
IF 17.5
Cuiying Ye,Di Liu,Yikui Gao,Fan Liu,Hongxuan Xu,Tao Jiang,Zhong Lin Wang
Electrification at water-solid interfaces, which enhances interfacial physical and chemical reactions, plays a crucial role in energy fields. However, the fundamental limits on charge transfer due to contact electrification (CE) at these interfaces remain poorly understood. Here, we first demonstrate electrostatic breakdown (EB) in the vicinity of liquid-solid-gas interfaces, which is attributed to the enhanced electric field in the gas close to the triple-phase contact line. Furthermore, we discover the significant impact of distant conductors on the interface electric field depending on their locations and grounding statuses and observe two types of breakdowns. Guided by an established physical model of breakdown, we achieve a record-high charge density of 1.36 mC m −2 in CE at water-insulator interfaces. Finally, we show the broad impact of EB on energy harvesting, surface wettability, and droplet motion at water-insulator interfaces. This previously unexplored EB phenomenon could offer new insights into interfacial charge and energy exchange at water-solid interfaces.
研究领域:
能源科学
·
材料科学
·
表面物理化学
✓ 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）