CHEMISTRY AND PHYSICS OF LIPIDS
·
2018
·
IF 2.766
Jiadan Hong,Huifang Yang,Dongwen Pang,Luxi Wei,Chunlin Deng
Lipid vesicles are an attractive model membrane experimental platform that is widely used in a biological context. The stability of vesicles can affect their performance and depends on various experimental conditions. How bio-related ions affect vesicle morphology is poorly understood in some cases. Herein, we investigated changes in vesicle morphology influenced by cation in the static and flowing environments. The effects of different mono- and di-valent metal cations on the morphology of lipid vesicles were systematically studied using the various techniques. The results showed that divalent cations caused significant aggregation or fusion of lipid vesicles, but monovalent cations had little effect on the vesicle morphology. Cation binding increased the net surface potential of vesicles, leading to changes in the zeta potential. The same qualitative kinetics were observed for cations that had the same valence at the same ionic strength. However, different types of cations gave different quantitative effects. The order of the ability to destroy the vesicle morphology was Cu 2+ > Mg 2+ > Ca 2+ > Na + > K + . These results are of practical value in the use of lipid vesicles as a bionic model, and help to shed light on the role of ions at membrane surfaces and interfaces.
研究领域:
生物物理学
·
膜生物学
·
生物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SYNTHETIC METALS
·
2016
·
IF 2.299
Cheng-bin Gong,Li-hua He,Jun-fei Long,Lan-Tao Liu,Song Liu,Qian Tang,Xiang-kai Fu
Azobenzene-bridged cationic–neutral and cationic–cationic were synthesized, characterized and compared with azobenzene-bridged neutral–neutral materials. Azobenzene-bridged cationic–cationic and neutral–neutral materials exhibited well-defined and reversible redox couples during redox processes, good electrochromic behavior, and appropriate contrast ratios in the visible regions. However, azobenzene-bridged cationic–neutral materials exhibited a quasi-reversible electrochemical process. The electrochromic stability of these compounds is in the order: azobenzene-bridged neutral–neutral materials > azobenzene-bridged cationic–cationic materials > azobenzene-bridged cationic–neutral materials. Electrochromic devices based on azobenzene-bridged neutral–neutral materials achieved maximum optical contrast, fast response time, and high coloration efficiency. The substituents of azobenzene-bridged cationic–cationic materials and the anions of azobenzene-bridged cationic–neutral materials did not significantly influence their electrochemical properties and response time, but slightly affected the maximum optical contrast, change in optical density, and coloration efficiency.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
高影响因子
JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS
·
2017
·Vol. 56
·期 6
·501-508
·
IF 2.838
Sha Wu,Xiangjun Gong,Geoffrey I. N. Waterhouse,Guangzhao Zhang
The effect of monovalent and divalent cations on the ssDNA to dsDNA transformation was systematically examined. For salts containing monovalent cations (LiCl, NaC1, KCl, CsCl), the conversion of ssDNA to dsDNA increased with ionic strength up to a value of I = 0.01 M and then plateaued, confirming that all four of the monovalent cations behaved similarly and promoted the formation of dsDNA. The monovalent cation type influenced the equilibrium constant for the conversion of ssDNA to dsDNA, indicating a degree of ion-specificity in dsDNA formation. In the case of salts containing divalent cations (e.g., MgCl 2 ), the conversion of ssDNA to dsDNA also increased with increasing ionic strength, though the plateau region was reached at a much lower ionic strength ( I = 5.0 × 10 −4 M), which can be attributed to the higher electrostatic screening efficiency of Mg 2+ cations and thus their superior ability to link DNA chains. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2018 , 56 , 501–508
研究领域:
生物化学
·
分子生物学
✓ 已验证
产品关联
DOI
高影响因子
FOOD RESEARCH INTERNATIONAL
·
2022
·
IF 7.425
Qingqing Yu,Zhiyu Xiong,Tong Shi,Li Yuan,Yulong Bao,Ruichang Gao
In order to elucidate the gelling mechanism of Premna microphylla turcz (PMT) induced by plant ash (PA), PA was fractionated into supernatant (PA-S) and precipitation (PA-P) and added to the PMT suspension, respectively. The effects of different concentrations (1–9%) and fractions (PA, PA-S, PA-P) of PA suspension on the gel properties were studied. Results showed that the electrical conductivity, content of monovalent cations, pH were higher in PA-S than PA-P. Both the PA-S and PA-P fractions induced the gelation of PMT (except for the low concentration at 1% for PA-S), and the PA-P-PMT gels showed much higher gel strength and hardness than PA-S-PMT gels. With increased concentration, the gel strength increased in PA-P-PMT, but decreased in PA-S-PMT. A hypothesis for the gelation of PMT induced by PA was proposed: the divalent cations in PA bind to carboxyl group in pectin and form gels; when higher content of PA is added, a higher pH leads to extensive dissociation of carboxyl groups thereby increases the electrostatic repulsion between pectin chains, which ultimately weakens the gelling forces. This study can provide theoretical support for further optimization of the traditional processing of PMT gels.
研究领域:
食品科学
·
植物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Jing Li,Fan Yang,Yunzhu Du,Min Jiang,Xiyang Cai,Qiaodan Hu,Junliang Zhang
Development of perovskite-type electrocatalysts with high activity, excellent durability and affordable cost provides a promising solution to promote commercialization of clean energy technologies. Here we prepared Bi 0.15 Sr 0.85 Co 1− x Fe x O 3−δ ( x = 0.2, 0.4, 0.6, 0.8, 1) perovskites by the conventional solid-state reaction route, and investigated their OER electrocatalytic activity and durability in 0.1 M KOH solution to reveal the critical role of A, B-site cations and oxygen vacancies. Results show the OER activity decreases with increasing x . The optimum composition, BiSC 0.8 F 0.2 , presents impressive electrocatalytic performances with low overpotential (330 mV on rotation disk electrode, and 283 mV on carbon paper electrode at 10 mA/cm 2 ) and excellent long-time durability showing a small increase in the overpotential of 17 mV in 167.5 h. Comprehensive analysis and discussion on the bulk and surface properties reveal the critical role of A, B-site cations and oxygen vacancies on OER, and interrelations of Co 2+ fraction, oxygen non-stoichiometry and the OER overpotential have been established. Most importantly, a highly A-site deficient surface layer is found on the as-synthesized perovskite, which facilitate OER by exposing more active B-site cations. This work not only reports a promising OER electrocatalyst with high activity and superior durability, but also provides perspectives on relational design for highly efficient and stable perovskite electrocatalysts for OER using solid-state reaction method.
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2022
·
IF 4.171
Ting Wang,Yu Tong,Yuhe Chen,Zhiyu Fang,Heng Qi,Yali Chen,Youqian Zhang,Hongyue Wang,Kun Wang,Hongqiang Wang
Blue-emitting perovskite materials have attracted remarkable attention in recent years owing to their potential in full-color display and lighting applications. Two-dimensional (2D) perovskite nanoplatelets (NPls) are considered as competitive blue emitters due to high carrier recombination probability and good spectrum stability compared with their mixed-halide counterparts. However, the 2D nature and high defect density of perovskite NPls generally result in nonradiative carrier recombination, making it problematic for achieving efficient blue emission. Herein, we reported a novel way to enhance the blue emission efficiency of perovskite NPls. We found that by using formamidinium cation (FA + ) to replace the cesium cation (Cs + ) during NPls synthesis, the photoluminescence (PL) of the NPls can be significantly enhanced. The PL quantum yield (PLQY) of NPls exhibited a monoclinic rising tendency with increased FA + content, and the FAPbBr 3 NPls finally show efficient deep blue emission at 433 nm with PLQY up to 70% as well as narrow emission bandwidth of only 12 nm. We further demonstrated that efficient blue emission can be realized not only by FA + alloying but also by post-synthetic treatment of the as-synthesized CsPbBr 3 NPls using FA + , where the FA + was capable to replace the Cs + in perovskite NPls through cation exchange. Resultantly, PLQY as high as 90% was achieved at a pure blue wavelength of 457 nm. Our work provides a promising strategy for achieving efficient and color-pure blue-emitting perovskite materials, which could potentially further promote their light-emitting applications.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
SOIL & TILLAGE RESEARCH
·
2025
·
IF 6.8
Jinhua Yuan,E. Shengzhe,Xinnan Zhao
The hexamminecobalt trichloride ([Co(NH 3 ) 6 ]Cl 3 ) method extracts exchangeable (exch.) base cations needing 60 min. For soils containing calcium carbonate, a calcite saturated [Co(NH 3 ) 6 ]Cl 3 solution is used to determine the exch. Ca. The preparing time of calcite saturated [Co(NH 3 ) 6 ]Cl 3 solution requires to set overnight. This study evaluated the equivalence of [Co(NH 3 ) 6 ]Cl 3 method using stirring modification. The proposed modification can vastly save time and the whole extraction time can be shortened to 3–5 min. The preparing calcite saturated [Co(NH 3 ) 6 ]Cl 3 solution procedure can be omitted when measured soils containing calcium carbonate. For acidic soil, the measured CEC was below the certified range, the exch. Ca, Na and K were all in the certified value range; the exch. Mg above the certified range. For neural soil, the measured CEC, exch. Ca, Mg, Na and K were all in the certified range. For alkaline soil, the measured CEC was above the certified range, the exch. Ca, Mg, Na and K were all in the certified range. For saline soil, the measured CEC was above the certified range, the exch. Mg and K below the certified range; accurate exch. Ca and Na could not be achieved even in such a short extraction time because of the dissolution of gypsum and sodium salts. For sodic soil, the measured CEC was above the certified range, the exch. Mg and K below the certified range; the extracted Ca can be assumed the exch. Ca; the exch. Na can be calculated as CEC－(exch. Ca + exch. Mg + exch. K). The difference of CEC between measured and certified values were mainly because of the discrepancy of extractant pHs. The addition of CaCO 3 (≤ 80 %) had no effect on CEC or exch. base cations’ determinations. The CaCO 3 and CaSO 4 ∙2 H 2 O combination only affected the determination of exch. Ca.
研究领域:
土壤学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED POWDER TECHNOLOGY
·
2024
·
IF 4.2
Shiwei Wang,Yuheng Wang,Rongjie Kong
The objective of this study was to investigate how the synergistic interaction between monovalent sodium or potassium ions and cationic collectors could affect the efficiency of low-rank coal (LRC) flotation . Analytical techniques, such as Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), and molecular dynamics simulations (MDS) were utilized. The results indicated that at a collector concentration of 10 -2 mol/L, the flotation performance was impeded to varying degrees in both sodium and potassium ion solutions, except for the collector dodecyl trimethylammonium chloride (DTAC). Furthermore, combining sodium ions with DTAC and dodecylamine (DDA) with potassium ions significantly enhanced the flotation responses of the coal particles. The treatment with cationic surfactants reduced the degree of aromatic ring condensation on the surface, minimally affecting the overall content of oxygen-containing groups, though the types of these groups were significantly changed. The MDS analysis indicated that the adsorption of cationic collector molecules on the surface was mainly regulated by van der Waals forces rather than electrostatic interactions. This study can enhance our knowledge of how monovalent cations and cationic surfactants can affect the interactions involved in flotation bubble-particle attachment.
研究领域:
矿物加工工程
·
表面化学
·
分子模拟
✓ 已验证
产品关联
DOI
高影响因子
ChemPlusChem
·
2025
·
IF 2.8
Chunlong Yuan,Zetan Zhang,Shiying Tang,Yunsheng Gou,Pan Zhao,Haimin Li,Hua Yu
Graphical The diversified cation regulation strategy by adjusting both the spacers and A-site cations is developed, which achieving high performance quasi-2D Ruddlesden-Popper perovskite solar cells via cooperation effect between F-PEA + and FA + . Ruddlesden–Popper (RP) quasi-two-dimensional (2D) perovskites exhibit enhanced stability compared to their three-dimensional (3D) counterparts due to the incorporation of bulky organic spacers. However, their efficiency is relatively low owing to the large exciton binding energy and quantum confinement effects associated with these organic spacers. Herein, a diversified cation regulation strategy is developed by adjusting both the spacers and A-site cations, achieving the fabrication of mixed 4-fluoro-phenethylammonium (F-PEA + )/n-butylammonium (BA + ) and formamidinium (FA + )/methylammonium (MA + ) n = 4 quasi-2D RP perovskite solar cells. Primarily, the introduction of F-PEA + induces an ordered distribution of the film from low-n to high-n phases, resulting in enhanced crystallinity, larger grain size, fewer cracks, and voids as well as high-quality perovskite films with preferred orientation. Furthermore, the incorporation of FA + reduces the bandgap of the perovskite, facilitating exciton dissociation and enhancing carrier transport capabilities. Ultimately, under the cooperation effect, the obvious elevation in the efficiency of NiO x -based (BA 0.9 F-PEA 0.1 ) 2 (MA 0.8 FA 0.2 ) 3 Pb 4 I 13 n = 4 quasi-2D RP perovskite solar cells from 12.51 to 15.68% is achieved. Additionally, the unencapsulated devices retain 80.4% of initial efficiency after 1100 h of heating at 60 °C in ambient air with 40% relative humidity, demonstrating excellent thermal and moisture stability.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Guangzhe Wang,Tao Wu,Junhui Zhao,Benbing Shi,Tianrun Gu,Runnan Zhang,Xiaoyao Wang,Roni Kasher,Yanlei Su,Zhongyi Jiang
Ionic covalent organic frameworks (COFs) hold great promise in regulating the structure of polyamide nanofiltration membranes for divalent ions removal. In this work, we demonstrate cationic COF (cCOF) nanosheets engineered polyamide membrane with excellent divalent cations rejection. cCOF nanosheets as versatile regulator and an interlayer accelerate the self-sealing and self-termination of interfacial polymerization between polyethyleneimine and trimesoyl chloride, endowing membranes with dense network and small thickness. Meanwhile, the quaternary ammonium groups on cCOF nanosheets increase positive charges on membranes. Through synergistic intensification of electrostatic repulsion and size sieving, the resulting cCOF-PA membranes display excellent rejection for divalent cations (MgCl 2 , 99.3%), superior to most reported polyethyleneimine-based polyamide membranes. This work highlights the significance of ionic COF materials in developing positively charged membranes for efficient ionic and molecular separations.
研究领域:
材料科学
·
环境工程
·
膜技术
✓ 已验证
产品关联
DOI
高影响因子
Advanced Materials Interfaces
·
2022
·Vol. 9
·期 33
·2201206
·
IF 6.389
Ying Liu,Jinfeng Kong,Xiangying Bian,Yuping Zhang,Miaozhou Ji,Quan Peng,Jian Jin,Yuzhang Zhu
Positively charged nanofiltration (NF) membranes with high perm-selectivity are highly desired to remove divalent cations such as Ca 2+ and Mg 2+ ions to ensure the safety of domestic and industrial water supply. In this work, a poly(piperazinamide) NF membrane with a positively charged surface is fabricated via the surfactant-assembly regulated interfacial polymerization (SARIP) of piperazine (PIP) and 1,3,5-trimesoyl chloride (TMC). The surfactant assembly can accelerate PIP monomer into the hexane to react with TMC monomer, thus reducing the difference in the trans-interface diffusion of PIP and the diffusion of TMC in hexane, forming an interfacial polymerization with a stoichiometric characteristic. By tuning the concentration ratio of PIP and TMC, a positively charged poly(piperazinamide) NF membrane will be achieved. At the same time, utilizing the superior hydrophilicity of bacterial cellulose nanofibers nanofilm, a crumpled poly(piperazinamide) active layer is successfully constructed, resulting in a permeating flux up to 22 L m −2 h −1 bar −1 and simultaneously with a MgCl 2 rejection >96%. The performance of this positively charged poly(piperazinamide) NF membrane is superior to most other positive NF membranes for the removal of divalent cations so far.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Song Wang,Yan Wang,Yanchao Zhang,Zhiyan Sui,Junjian Yu,Jialin Zhao,Na Li,Yifang Chang,Di Liu,Zhe Wang
The conformation of N-spirocyclic cations has a high alkaline stability and the construction of microphase-separated structures with poly(biphenyl piperidine) (PBP) is one way to improve the performance of AEM. Here, a variety of N-spirocyclic cations were prepared and formed into polycationic side chains with the PBP main chain via the -(CH 2 ) 4 - spacer group. The ion transport efficiency was greatly enhanced by the synergistic effect of the main chain piperidine cations, and the hydroxide conductivity and peak power density of the MDSU-MPBP membrane reached 132.7 mS cm -1 and 295.2 mW cm -2 at 80 °C, respectively. The BM-DSU cation was degraded to a single cation mainly by the S N 2 reaction after 96 h in a 5 M NaOH/D 2 O solution at 80 °C. The N-spirocyclic mono-cation has extremely high alkali resistance, especially the MDSU cation without significant degradation at 80 °C for 1008 h. The B-MDSU double cation tends to undergo the S N 2 reaction at the C2 and C4 positions. The asymmetrically grafted main-chain piperidine cations exhibit poor chemical stability due to the electron-absorbing effect of the phenyl group. the degradation of the MDSU cations increases the hydrophobicity of the side chains, and the MDSU-MPBP membrane has the best alkali resistance, with a conductivity residual of more than 92.8% after immersion in a 5 M NaOH solution at 80 °C for 480 h.
研究领域:
材料科学
·
化学工程
✓ 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）