Journal of Materials Chemistry C
·
2023
·Vol. 11
·期 18
·6162-6172
·
IF 6.4
Zhe Zhang,Peng He,Wenjun Ma,Peiyuan Zuo,Xiaoyun Liu,Qixin Zhuang
In order to solve the problem of signal delay and crosstalk caused by the miniaturization of VLSI circuits, it is urgently required to further reduce the dielectric constant (k) of materials. To date, porous low-dielectric materials still have shortcomings such as difficulty in controlling the pore volume and large fluctuation of k over a wide temperature range. Herein, a novel and controllable selective etching strategy to fabricate yolk–multishell mesoporous silica nanoparticles (YS-CSSs@3S-mSiO2) is reported. This strategy allows precise control of the number of spherical shell layers, diameter, cavity size, mesoporous structure and core size, coupled with the closed-pore silica spheres (CSSs) as the core so that the obtained YS-CSSs@3S-mSiO2 nanoparticles have a high pore volume (0.95 cm3 g−1), low specific surface area (144 m2 g−1), uniform diameter and excellent monodispersity. We found that the corresponding 8 wt%-YS-CSSs@3S-mSiO2/fluorinated polybenzoxazole (6FPBO) composite film possesses an ultralow dielectric constant (k = 1.87) that is very competitive among the low-k materials reported. Moreover, the nanocomposite films maintain great stability with almost unchanged k values over a wide temperature range up to 200 °C. The 5% weight loss temperature of nanocomposites reaches a maximum value of 540 °C. Accordingly, our current work provides a promising candidate for ultralow-k materials and lays a solid foundation for advanced material applications in the 5G communication and semiconductor field.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2023
·
IF 2.6
Xiaotong Yang,Jidong Wang,Miao Ma,Dongxu Wang,Jinliang Wu,Zhong Zhao
In this paper, the solubility of terbinafine hydrochloride in 13 mono-solvents was measured in the temperature range from 283.15 K to 323.15 K at ambient pressure with the assistance of a laser-based dynamic solubility-monitoring device. It was concluded that the solubility of terbinafine hydrochloride in these mono-solvents increases with rising temperature. At 323.15 K, the molar solubility shows the following order: cyclohexanol (7.739 × 10–2) > n-propyl alcohol (7.351 × 10–2) > n-amyl alcohol (6.967 × 10–2) > iso-butanol (6.932 × 10–2) > n-butanol (6.850 × 10–2) ≈ ethanol (6.778 × 10–2) > isoamyl alcohol (4.926 × 10–2) >1-hexanol (4.689 × 10–2) > dimethyl sulfoxide (4.010 × 10–2) > sec-butanol (2.878 × 10–2) > isopropyl alcohol (2.452 × 10–2) > isooctyl alcohol (2.211 × 10–2) > acetonitrile (0.532 × 10–2). Subsequently, the relationship between the solubility of terbinafine hydrochloride and temperature was correlated by six models (Apelblat, van’t Hoff, λh, Wilson, NRTL, and Jouyban models), and the mixing thermodynamic properties of the solutions were evaluated with the solubility and the parameters simulated by the Wilson model. In addition, the solvent effect on the solubility of terbinafine hydrochloride was discussed based on the Kamlet–Abboud–Taft linear solvation energy relationships.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2023
·
IF 2.6
Xinyi Lü,Xiaotong Yang,Xiaoli Wu,Jidong Wang,Zhong Zhao
In this paper, the solubility of menadiol diacetate in nine alcohols (methanol, ethanol, n-propanol, i-propanol, n-butanol, i-butanol, n-amyl alcohol, i-amyl alcohol, and cyclohexanol) and five n-alkyl acetates (methyl acetate, ethyl acetate, n-propyl acetate, n-butyl acetate, and amyl acetate) was experimentally measured with the aid of a laser dynamic device at temperatures from 283.15 to 323.15 K. The solubility of menadiol diacetate as a function of temperature was regressed in terms of three semiempirical solubility models (Apelblat, van’t Hoff, and λh), two activity coefficient solubility models (Wilson and NRTL), and the Jouyban model. The thermodynamic mixing properties (mixing Gibbs energy, entropy, and enthalpy) of the solutions were estimated in terms of the measured solubility data and the regressed parameters of the Wilson model.
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2019
·
IF 8.456
Shanshan Yang,Yuanwei Liu,Junbin Liao,Huawen Liu,Yuliang Jiang,Bart Van der Bruggen,Jiangnan Shen,Congjie Gao
Surface modification has been proven to be an effective approach for ion exchange membranes to achieve separation of counterions with different valences by altering interfacial construction of membranes to improve ion transfer performance. In this work, we have fabricated a series of novel cation exchange membranes (CEMs) by modifying sulfonated polysulfone (SPSF) membranes via codeposition of mussel-inspired dopamine (DA) and 4′-aminobenzo-15-crown-5 (ACE), followed by glutaraldehyde cross-linking, aiming at achieving selective separation of specific cations. The as-prepared membranes before and after modification were systematically characterized in terms of their structural, physicochemical, electrochemical, and electrodialytic properties. In the electrodialysis process, the modified membranes exhibit distinct perm selectivity to K+ ions in binary (K+/Li+, K+/Na+, K+/Mg2+) and ternary (K+/Li+/Mg2+) systems. In particular, at a constant current density of 5.0 mA·cm–2, modified membrane M-co-0.50 shows significantly prominent perm selectivity in the K+/Mg2+ system and M-co-0.75 exhibits remarkable performance in the K+/Li+ system , superior to commercial monovalent-selective CEM (CIMS, , ). Besides, in the K+/Li+/Mg2+ ternary system, K+ flux reaches 30.8 nmol·cm–2·s–1 for M-co-0.50, while it reaches 25.8 nmol·cm–2·s–1 for CIMS. It possibly arises from the effects of pore-size sieving and the synergistic action of electric field driving and host–guest molecular recognition of ACE and K+ ions. This study can provide new insights into the separation of specific alkali metal ions, especially on reducing influence of coexisting cations K+ and Na+ on Li+ ion recovery from salt lake and seawater.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Energy Storage Materials
·
2019
·
IF 0
Jing Tian,Xuejun Zhou,Qingping Wu,Chilin Li
Mg-based batteries modulated by Li-salt additive can bypass the sluggish Mg solid diffusion at cathode side by kinetically better Li intercalation. However for this dual-salt system the highly electroactive cathodes endowed with high intrinsic conductivity and multi-electron transfer are still lacking, especially under large-sized grains and their high loading. Here a rhodizonate organic salt pre-pillared by K-ions (K 2 C 6 O 6 ) is proposed as high-rate cathode for Li-salt mediated Mg batteries. Under a high loading of 70 wt%, well-crystallized K 2 C 6 O 6 composed of ultra-large micro-sized grains (up to 30 μm) shows a reversible capacity more than 300 mA h/g at 0.1 C (based on three electron transfer), and up to 200, 130 and 60 mA h/g at 2 C, 5 C and 10 C respectively. The high bulk electron/ion conductivity and low solubility are responsible for such a superior performance based on fast Li-K electrochemical exchange and highly reversible Li intercalation without the assistance of nano-sizing, as a consequence of optimization and stabilization of desired electron structure and open framework by K-ion pre-supporting (instead of Li/Na-pillaring) and Mg-ion trapping between C 6 O 6 2- layers. These large monoliths of K 2 C 6 O 6 do not undergo serious grain fracture after long-term cycling, and at that time the Mg anode still remains compact and dendrite-free.
✓ 已验证
产品关联
DOI
JOURNAL OF HAZARDOUS MATERIALS
·
2019
·
IF 7.65
Naien Zhang,Jie Zhang,Hong Yan,Xiaorong Guo,Qiang Sun,Ruijie Guo
To overcome the flammability and severe dripping of polypropylene (PP), a novel organic-inorganic hybrid K-HBPE@APP (microencapsulated APP by a hyperbranched polyester (HBPE) via silane coupling agent (KH-550)) was obtained and used as a high-efficient flame retardant and smoke suppressant. Herein, HBPE acted as the charring agent for APP. 20 wt% of K-HBPE@APP imparted PP excellent flame retardancy, V-0 rating (UL-94 test) and 82.6% decrease in the peak of heat release rate (PHRR). However, PP with 25 wt% of mechanically mixed APP and HBPE achieved V-1 rating (UL-94 test) and 77.3% decrease in PHRR. That is because the direct contact and sufficient interaction between APP and HBPE gives full play to their synergy. Besides, K-HBPE@APP accelerated the formation of cross-linked P O C/Si O Si/ Si O C/Si O P/P O Φ structures, leading to a strong and compact char layer with a result of dramatic reduction in heat release rate and smoke production. Furthermore, K-HBPE@APP was highly water-resistant and has good compatibility with PP matrix. In particular, the flame-retarded PP had similar tensile strength to pure PP and enhanced impact strength.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2018
·
IF 4.513
Chunyan Chu,Chunying Zhu,Taotao Fu,Youguang Ma
The densities and viscosities of aqueous solutions of sodium glycinate , sodium l -alaninate, sodium l -valinate, sodium l -threoninate and sodium l -argininate were measured at T = (293.15 to 333.15) K under the atmospheric pressure. The effects of temperature and concentration on the densities and viscosities of binary solutions were investigated. The volumetric and viscometric properties such as the apparent molar volume ( V φ ), the limiting partial molar volume ( V φ 0 ), the viscosity B -coefficient ( B ) and the activation energy for viscous flow ( Ea ) were calculated by the experimental density and viscosity data and analyzed based on the molecular structure and intermolecular interaction . Moreover, the group contribution method was utilized to study the limiting partial molar volume ( V φ 0 ), and the contributions of the end group (-NH 2 ,-COONa), CH- group, CH 2 - group, CH 3 - group, OH- group and CNHNHNH 2 - group to the limiting partial molar volume ( V φ 0 ) were obtained. The results show that all these groups have positive contributions to the limiting partial molar volume ( V φ 0 ).
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 39
·20737-20746
·
IF 8.867
Yuxin Wang,Xingyi Huang,Tao Li,Zhongwu Wang,Liqiang Li,Xiaojun Guo,Pingkai Jiang
High-dielectric-constant (high-k) polymers are highly desirable for energy storage and dielectric applications in power systems and microelectronic devices because of their easy processing and flexibility. However, the enhancement of k is usually at the cost of other undesirable properties such as increase of dielectric loss and leakage currents and decrease of breakdown strength. Herein, using reversible-addition fragmentation chain transfer (RAFT) polymerization, we report a series of novel low-temperature crosslinkable high-k copolymers, poly(2-(methylsulfonyl)ethyl methacrylate-co-glycidyl methacrylate) (poly(MSEMA-co-GMA)), which exhibit k values about 9–12. The crosslinking significantly enhances the breakdown strength (Eb ≈ 500 MV m−1), suppresses the leakage currents and improves the solvent resistance. The excellent dielectric performance makes the copolymers have both high energy storage capability and high energy efficiency. The discharged energy density reached 12.5 J cm−3 at 500 MV m−1. Noticeably, an efficiency higher than 85% was maintained even at a high field of 400 MV m−1, which is much higher than those of poly(vinylidene fluoride) (PVDF) based ferroelectric polymers with comparable k. Furthermore, the poly(MSEMA-co-GMA) copolymers were successfully applied as dielectric layers for organic field-effect transistors (OFETs) to realize low-voltage operation.
✓ 已验证
产品关联
DOI
高影响因子
ACS Omega
·
2022
·
IF 4.132
Guo-liang Nie,Rui-zhi Cui,Zhong Liu,Wu Li
In view of the composition characteristics of lithium, calcium, and bromine rich in Nanyishan oilfield water of the Qaidam Basin, Qinghai Province, the phase equilibrium relationships of quaternary system LiBr–NaBr–KBr–H2O and its ternary subsystems LiBr–NaBr–H2O and LiBr–KBr–H2O at 348.15 K were studied by the isothermal solution equilibrium method, and the equilibrium solid-phase crystallization regions and composition of each invariant point in each system were determined. The results show that there is no complex salt or solid solution in ternary systems LiBr–NaBr–H2O and LiBr–KBr–H2O at 348.15 K, and the phase diagram contains only one invariant point, two isothermal univariate curves, and two equilibrium solid-phase crystallization regions. The quaternary system LiBr–NaBr–KBr–H2O also has no formation of complex salt or solid solution, and the phase diagram contains only one invariant point, three isothermal univariate curves, and three equilibrium solid-phase crystallization regions. Meanwhile, the phase equilibrium relationships and change laws of each component of the above-mentioned systems at different temperatures were compared and discussed.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2023
·
IF 2.6
Miao Ma,Jidong Wang,Xiaotong Yang,Yixin Qu
In this paper, the solubility of clotrimazole, an antifungal drug, in 10 alcohols (n-propanol, iso-propanol, n-butanol, iso-butanol, sec-butanol, n-pentanol, iso-pentanol, n-hexanol, n-heptanol, and n-octanol) and 6 esters (methyl acetate, ethyl acetate, n-propyl acetate, n-butyl acetate, isopropyl acetate, and methyl propionate) was experimentally determined using a laser dynamic solubility-monitoring device in a temperature range of 283.15 to 323.15 K at atmospheric pressure. The functions of solubility versus temperature were regressed using three semi-empirical models (modified Apelblat, three-parameter van’t Hoff, and λh) and two activity coefficient models (Wilson and NRTL). The results show that all the five models can be used to correlate the solubility of clotrimazole with temperature in these solvents satisfactorily. Furthermore, the thermodynamic mixing properties (ΔmixG, ΔmixH, ΔmixS, ln(γ1∞), and H1E, ∞) were evaluated using the measured solubility values and Wilson model parameters.
✓ 已验证
产品关联
DOI
高影响因子
Frontiers in Chemistry
·
2023
·
IF 5.5
Cui Ruizhi,Peng Changwei,Nie Guoliang,Sang Shihua,Ren Hongbao,Li Wu
In view of the composition characteristics of lithium, calcium and bromine rich in Nanyishan oil and gas field brine of western Qaidam Basin, Qinghai Province, as well as based on the results reported in relevant literature, the phase equilibrium relationship of ternary system LiBr-CaBr2-H2O at 298.15 K was studied by isothermal dissolution equilibrium method. The equilibrium solid phase crystallization regions, as well as the compositions of invariant point, in phase diagram of this ternary system were clarified. On basis of the above ternary system research, the stable phase equilibria of quaternary systems (LiBr-NaBr-CaBr2-H2O, LiBr-KBr-CaBr2-H2O and LiBr-MgBr2-CaBr2-H2O), as well as quinary systems (LiBr-NaBr-KBr-CaBr2-H2O, LiBr-NaBr-MgBr2-CaBr2-H2O and LiBr-KBr-MgBr2-CaBr2-H2O) were further carried out at 298.15 K. According to the above experimental results, the corresponding phase diagrams at 298.15 K were drawn, which revealed the phase relationship of each component in solution and the law of crystallization and dissolution, and meanwhile summarized changing trends. The research results of this paper lay a foundation for further research on the multitemperature phase equilibria and thermodynamic properties of lithium and bromine containing high-component brine system in later stage, and also provide basic thermodynamic data for guiding the comprehensive development and utilization of this oil and gas field brine resource.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RUSSIAN JOURNAL OF INORGANIC CHEMISTRY
·
2023
·Vol. 67
·期 1
·S78
·
IF 2.1
Han H. J.,Ma J. J.,Xing K. Q.,Shao D. X.,Zhong S. K.
Abstract In this work, the equal-water activities for the ternary system LiCl−KCl−H 2 O and its sub-binary systems LiCl−H 2 O were determined using an isopiestic method at 323.15 K. The determined isopiestic composition lines for the LiCl−KCl−H 2 O system were found to deviated Zdanovskii rule high with increasing ionic strength of the mixture solution. The addition of KCl to an aqueous solution of LiCl was found to decrease and increase the water activity at low and high LiCl molality. The Pitzer–Simonson–Clegg (PSC) model was used to represent the experimental determined water activities of the titled system and the calculated values are discussed. Based on the calculated results, the turning point appears at about 17.0 mol kg −1 LiCl solution.
✓ 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）