JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2014
·
IF 3.107
Xue-Qin Zhang,Ming-Jie Chen,Chuan-Fu Liu,Run-Cang Sun
The preparation of xylan-graft-poly(ε-caprolactone) (xylan-g-PCL) copolymers was investigated by homogeneous ring-opening polymerization (ROP) in a dual-component system containing Lewis base LiCl and strong polar aprotic solvent dimethyl sulfoxide (DMSO). DMSO/LiCl acted as solvent, base, and catalyst for the ROP reaction. The effects of the parameters, including the reaction temperature, molar ratio of ε-caprolactone (ε-CL) to anhydroxylose units (AXU) in xylan, and reaction time, on the degree of substitution (DS) and weight percent of PCL side chain (WPCL) were investigated. The results showed that xylan-g-PCL copolymers with low DS in the range of 0.03–0.39 were obtained under the given conditions. The Fourier transform infrared spectroscopy (FTIR), 1H nuclear magnetic resonance (NMR), 13C NMR, 1H–1H correlation spectroscopy (COSY), and 1H–13C correlation two-dimensional (2D) NMR [heteronuclear single-quantum coherence (HSQC)] characterization provided more evidence of the attachment of side chains onto xylan. Only one ε-CL was confirmed to be attached onto xylan with each side chain. Integration of resonances assigned to the substituted C2 and C3 in the HSQC spectrum also indicated 69.23 and 30.77% of PCL side chains attached to AXU at C3 and C2 positions, respectively. Although the attachment of PCL onto xylan led to the decreased thermal stability of xylan, the loss of unrecovered xylan fractions with low molecular weight because of the high solubility of xylan in DMSO/LiCl resulted in the increased thermal stability of the samples. This kind of xylan derivative has potential application in environmentally friendly and biodegradable materials considering the good biodegradability of xylan and PCL.
研究领域:
高分子化学
·
绿色化学
·
生物材料
·
碳水化合物化学
✓ 已验证
DOI
高影响因子
JOURNAL OF RARE EARTHS
·
2020
·
IF 3.104
Mei Li,Yongcheng Zhang,Haiming Li,Hailing Jiang,Wei Han,Yang Sun
In the present work, cyclic voltammetry (CV), square wave voltammetry (SWV) and chronopotentiometry (CP) were used to investigate the electrochemical coreduction behaviors of La(III) and Mg(II) as well as La(III), Mg(II) and Mn(II) on Mo electrode in LiCl + KCl molten salts. CV and SWV results exhibit that the coreduction mechanism of La (III) and Mg(II) on Mo electrode is that La(III) is reduced and Mg–La intermetallic compound is formed, leading to the deposition potential of La(III) shifting to more positive one. The electrochemical signals pertaining to the formation of metallic La, Mg and Mn as well as Mg–La intermetallic compound are also observed by coreduction of La(III), Mg(II), and Mn(II) in LiCl + KCl molten salt on the inert Mo electrode. However, the electrochemical signals associated with the formation of La–Mn and Mg–Mn alloys are not observed, which means that the depolarization effect of La(III) and Mg(II) does not occur on pre-deposited Mn electrode. The Mg–La–Mn alloys were formed by co-deposition of La(III), Mg(II), and Mn(II) on Mo electrode at various concentration ratios of La(III) and Mg(II). The results of scanning electron microscopy equipped with energy dispersive spectroscopy and X-ray diffraction displays that the Mg–La–Mn alloys are comprised of La–Mg compound Mg 17 La 2 , Mg and Mn phases. The concentration ratio of La(III) and Mn(II) has few effects on the alloy composition .
研究领域:
材料科学
·
电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2020
·
IF 5.065
Rui-Zhi Cui
The experimental solubility of LiCl–Li 2 SO 4 –MgCl 2 –MgSO 4 –H 2 O and KCl–K 2 SO 4 –MgCl 2 –MgSO 4 –H 2 O systems was measured at 288.15 K. The corresponding stable phase diagrams and water content diagrams were plotted by experimental results. Double salt was formed in both two systems. There are six phase fields, nine univariant solution curves and four invariant points in the phase diagram of LiCl–Li 2 SO 4 –MgCl 2 –MgSO 4 –H 2 O system. And the diagram of another system has seven invariant points and eight crystallization regions. By using multiple linear regression method, parameter Ψ Li,Cl,SO4 and the solubility equilibrium constants of double salt KCl·MgSO 4 ·3H 2 O were obtained by solubility data fitting at 288.15 K. The equilibrium solubility of salts in above systems at the same temperature was predicted with Pitzer's electrolyte solution model and mathematical calculation software. The results indicate that the predicted data are in correspondence with experiments.
研究领域:
化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Refrigeration
·
2018
·
IF 3.233
Han Wang,Qing Cheng,Wei Feng,Wenhao Xu
At present, the energy consumption in buildings occupies a large proportion of total energy use, and air-conditionings cost a large proportion of energy in the buildings. The liquid desiccant air-conditioning system has a good energy saving potential and the electrodialysis (ED) regeneration is a reliable choice for the liquid desiccant regeneration. In order to establish the energy consumption model and the performance coefficient model of liquid desiccant air-conditioning system based on ED regeneration using LiCl, experimental and theoretical research on the electrical conductivity of LiCl aqueous solution with a lot of concentrations and temperatures was conducted in this paper. The results show that when polynomial degrees of the mass concentration and the temperature of the LiCl aqueous solution are both 3, the electrical conductivity model for the LiCl aqueous solution is most suitable as its simplicity and high accuracy. Moreover, when the concentration is 36% and the temperature is 22 °C, the liquid desiccant cooling system has the maximum COP of about 5. Finally, a case study of a small office room was conducted, and the result shows that the liquid desiccant cooling system based on electrodialysis regeneration has a good energy-saving potential.
研究领域:
建筑节能
·
空调系统
·
传热与流体流动
✓ 已验证
产品关联
DOI
高影响因子
Nano-Micro Letters
·
2023
·Vol. 16
·期 1
·1-17
·
IF 26.6
Nan Jingya,Sun Yue,Yang Fusheng,Zhang Yijing,Li Yuxi,Wang Zihao,Wang Chuchu,Wang Dingkun,Chu Fuxiang,Wang Chunpeng,Zhu Tianyu,Jiang Jianchun
Solid-state zinc-ion capacitors are emerging as promising candidates for large-scale energy storage owing to improved safety, mechanical and thermal stability and easy-to-direct stacking. Hydrogel electrolytes are appealing solid-state electrolytes because of eco-friendliness, high conductivity and intrinsic flexibility. However, the electrolyte/electrode interfacial contact and anti-freezing properties of current hydrogel electrolytes are still challenging for practical applications of zinc-ion capacitors. Here, we report a class of hydrogel electrolytes that couple high interfacial adhesion and anti-freezing performance. The synergy of tough hydrogel matrix and chemical anchorage enables a well-adhered interface between hydrogel electrolyte and electrode. Meanwhile, the cooperative solvation of ZnCl 2 and LiCl hybrid salts renders the hydrogel electrolyte high ionic conductivity and mechanical elasticity simultaneously at low temperatures. More significantly, the Zn||carbon nanotubes hybrid capacitor based on this hydrogel electrolyte exhibits low-temperature capacitive performance, delivering high-energy density of 39 Wh kg −1 at −60 °C with capacity retention of 98.7% over 10,000 cycles. With the benefits of the well-adhered electrolyte/electrode interface and the anti-freezing hydrogel electrolyte, the Zn/Li hybrid capacitor is able to accommodate dynamic deformations and function well under 1000 tension cycles even at −60 °C. This work provides a powerful strategy for enabling stable operation of low-temperature zinc-ion capacitors.
研究领域:
材料科学
·
电化学
·
能源存储
✓ 已验证
DOI
高影响因子
ACS Nano
·
2022
·
IF 18.027
Yu Wang,Lingyu Sun,Guopu Chen,Hanxu Chen,Yuanjin Zhao
Ionic hydrogels have attracted extensive attention because of their wide applicability in electronic skins, biosensors, and other biomedical areas. Tremendous effort is dedicated to developing ionic hydrogels with improved detection accuracy and multifunctionality. Herein, we present an inverse opal scaffold-based structural color ionic hydrogel with the desired features as intelligent patches for wound management. The patches were composed of a polyacrylamide-poly(vinyl alcohol)-polyethylenimine-lithium chloride (PAM–PVA-PEI-LiCl) inverse opal scaffold and a vascular endothelial growth factor (VEGF) mixed methacrylated gelatin (GelMA) hydrogel filler surface. The scaffold imparted the composite patches with brilliant structural color, conductive property, and freezing resistance, while the VEGF-GelMA surface could not only prevent the ionic hydrogel from the interference of complex wound conditions but also contribute to the cell proliferation and tissue repair in the wounds. Thus, the hydrogel patches could serve as electronic skins for in vivo wound healing and monitoring with high accuracy and reliability. These features indicate that the proposed structural color ionic hydrogel patches have great potential for clinical applications.
研究领域:
生物医学工程
·
材料科学
·
组织工程
·
伤口愈合
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2026
·
IF 7.8
Xuehui Wang,Guangwu Zhang,Kaifeng Huang,Xiang Fang,Cheng Wang,Haojun Xu,Chenchen Zhang,Xiaoya Wang,Qiye Zheng,Jinyun Liu
Heterostructured cathodes are widely credited with accelerating conversion kinetics in magnesium/lithium hybrid-ion batteries (MLHBs). Here, we construct a Cu7S4/CuCo2S4 heterostructure in a single hydrothermal process, in which the two phases sharing a common Cu-S sublattice form a coherent interface within individual particles. By fixing the phase ratio independently through Rietveld refinement and benchmarking against both phase-pure constituents under identical conditions, we show that the composite exceeds the composition-weighted rule-of-mixtures prediction by a factor of 3.4 at 0.3 A g-1. Because the constituents exhibit closely comparable charge-discharge profiles, the redox chemistry itself is unchanged, and this strongly super-additive response can primarily originate from the interface rather than from composition. Elemental mapping and surface-sensitive XPS, together with the coexistence of Li2S and MgS in in situ XRD, further reveal that storage is spatially partitioned: Li+ converts the particle interior while Mg2+ reacts predominantly in the near-surface region, so that the two carriers occupy complementary regions of the same particle. Comparing APC-LiCl with APC-LiTFSI at matched salt concentration, and identical in every other respect, localizes the electrolyte effect to the electrode interface, where the chloride-containing system suppresses the progressive Mg-surface passivation that drives continuous overpotential growth in the TFSI- system. The resulting cell delivers 400 mAh g-1 at 0.3 A g-1 and retains 152.56 mAh g-1 after 330 cycles at 1.0 A g-1 at ∼100% Coulombic efficiency. DFT calculations indicate increased states near the Fermi level and a localized interfacial electrostatic gradient consistent with the measured kinetics.
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2022
·
IF 5.518
Yueqin Li,Yong Yang,Xiaohui Liu,Yiwen Yang,Yiyang Wu,Lin Han,Qiangshan Han
Wearable smart sensors based on conductive hydrogels have attracted intensive research interest due to their high comfort and accurate detection of physiological signals. However, most reported hydrogel sensors cannot work independently and require external power. Herein, we report a novel electrochemical-driving self-powered strain sensor based on a multifunctional polyacrylamide/carboxymethyl chitosan/LiCl (PAAM/CMC/LiCl) hydrogel. This hydrogel was facilely prepared by one-step UV-initiated polymerization strategy and integrated high stretchability (a large strain of 640% with a tensile strength of 67 kPa), anti-drying and anti-freezing (−48.27 °C) properties, self-healing ability, as well as good electrical conductivity (0.56 S/m). As an effective electrolyte material, the PAAM/CMC/LiCl hydrogel is directly assembled with Zn and MnO 2 electrodes to form a flexible zinc-ion battery (ZIB), from which a decent specific capacity and desirable stable power output are found even under various mechanical stimuli. Taking advantage of the high strain sensibility of the PAAM/CMC/LiCl hydrogel, a closed loop consisting of the ZIB and a fixed resistor can realize the function of strain sensing and energy storage capabilities simultaneously. This self-powered sensing system has demonstrated high sensitivity, good stability and strong power-generating performance during the real-time monitoring of human activities, which are highly anticipated in the wearable electronics.
研究领域:
材料科学
·
生物医学工程
·
能源技术
✓ 已验证
产品关联
DOI
高影响因子
Advanced Materials Interfaces
·
2025
·Vol. 12
·期 15
·e00421
·
IF 4.4
Hengyu Pan,Lingmei Zhu,Huijie Wei,Chang Gao,Maolin Zhou,Tiance Zhang,Qiang Luo,Boyang Tian,Jianhua Wang,Yongping Hou,Yongmei Zheng
A bioinspired spider silk fiber (i.e., PCLC) is presented by introducing the zwitterionic hydrogel poly-[2-(methacryloyloxy)ethyl] dimethyl-(3-sulfopropyl)ammonium hydroxide (PDMAPS) and CAU-10-H used as carriers of hygroscopic salt Lithium chloride (LiCl), and the addition of carbon black (CB) nanoparticles makes the prepared fibers have photothermal effect. PCLC fiber achieves the moisture absorption capacity of ≈1.49 – 1.99 g g −1 after 2 h adsorption at ≈40% relative humidity (RH). The temperature of a single PCLC knot can rise to 46.4 °C for ≈3600 s, and the temperature of a batch of PCLC spider knot fibers can rise to 112.1 °C for ≈3600 s (under ≈1 sun illumination), which has excellent photothermal effect. Water collection is conducted for five consecutive days with a daily collected amount of ≈1.87 g g −1 . The PCLC fiber shows good water vapor adsorption reversibility after 10 consecutive adsorption-desorption cycles, the moisture absorption can be stabilized at ≈1.9 g g −1 , and the water vapor desorption capacity reaches ≈1.73 g g −1 (under ≈1 sun illumination, exhibiting water vapor desorption efficiency of ≈92.1%).
研究领域:
材料科学
·
环境科学
·
纳米技术
·
高分子科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2022
·
IF 3.119
Tao Zhang,Liwei Zhuang,Dan Li,Lingzong Meng,Tianlong Deng,Yafei Guo,Yong Ma
The solubilities of salts, refractive indices, and pH values of the equilibrium liquid phases in the quaternary system LiCl–LiBO2–Li2B4O7–H2O at 323.15 K were investigated by the isothermal dissolution method for the first time. The dry-salt diagram of the quaternary system consisted of one invariant point, three univariant curves and three crystallization fields corresponding to LiCl·H2O, LiBO2·2H2O, and Li2B4O7·3H2O. The solution refractive indices and pH values change regularly with the changing of concentration. Combining the equilibrium constants for different boron species, the distributions of six boron species in the mixed solution in the systems LiCl–LiBO2–H2O, LiBO2–Li2B4O7–H2O, and LiCl–Li2B4O7–LiBO2–H2O were calculated with the total boron concentration and pH values. The main boron species in the mixed solution of the quaternary system are B3O3(OH)4–, B4O5(OH)42–, B(OH)3, and B5O6(OH)4–. The boron species distributions are mainly affected by the pH values and the concentration of total boron and LiCl in the solution. The results of phase diagram and boron species distribution in the quaternary system can supply foundation data for separating lithium borate from brines.
研究领域:
化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Shu Zhang,Rui Sun,Pengxin Guan,Yaofeng Wang,Ling Wang,Yanli Zhu,Lijun Han,Jiayu Xin
Alkoxycarbonylation of alkene has been an important basis in modern chemical industry. As the cheapest noble metal, the potential of ruthenium furnishes significant innovations in the homogeneous catalysis. However, the competitive hydrogenation of alkenes to alkanes represents the most challenge in the alkoxycarbonylation of alkene. Herein, the chloride anions-assisted Ru-catalyzed methoxycarbonylation of methyl pentenoate was investigated. The chemoselectivity of methoxycarbonylation can be improved by controlling the ratio of LiCl/Ru 3 (CO) 12 . Mechanistic experiments show that the activation energy of hydrogenation is increased due to the change of the active species by increasing the amount of LiCl, which hinders the hydrogenation of methyl pentenoate. The di-methoxycarbonylation of 1,7-octadiene indicates that this methodology has the potential to develop the Ru-catalyzed di-methoxycarbonylation of diene substrates.
研究领域:
催化
·
有机化学
·
工业化学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2025
·
IF 9
Jinxiong Song,Lijun Song,Biao Ai,Youcai Chen,Ying Liu,Yuzhang Zhu,Jian Jin
Thin-film composite (TFC) polyamide (PA) nanofiltration (NF) membranes are essential for separating ions and small molecules in the industries, including water treatment, chemical processing, energy production, and pharmaceuticals. These membranes are typically fabricated via interfacial polymerization (IP) on polysulfone (PSf) or polyethersulfone (PES) ultrafiltration (UF) supports. Apparently, optimizing the physicochemical properties of the UF support is very important for achieving TFC-PA NF membranes with superior separation performance. This study systematically investigated the influence of common pore-forming agents used in UF membrane fabrication, specifically polyvinylpyrrolidone (PVP), polyethylene glycol (PEG), and lithium chloride (LiCl), on the desalination performance of resulting TFC-PA NF membranes. We characterized the zeta potential, pore structure, and surface wettability of PSf UF membranes prepared with each pore agent. These characteristics were then correlated with the adsorption and desorption behavior of piperazine (PIP) monomers during the IP process. Our findings indicate that employing PVP as a pore-forming agent not only enhanced PIP adsorption within the UF support but also facilitated its rapid release during the IP reaction. This dual effect resulted in a PA selective layer with reduced thickness and smaller pore size. Consequently, the TFC-PA NF membrane fabricated on the PVP-modified UF support exhibited both higher water permeance and improved salt rejection. This research highlights the significant role of the pore-forming agent in determining the performance of TFC-PA NF membranes. The results suggest that UF supports prepared using PVP as a pore agent may be optimal for creating NF membranes with enhanced overall performance.
研究领域:
膜科学
·
分离技术
·
高分子科学
·
水处理
·
化学工程
·
材料科学
✓ 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）