JOURNAL OF POLYMER RESEARCH
·
2025
·Vol. 32
·期 6
·1-11
·
IF 2.8
Han Yu,Wei Chaoquan,Wang Ting,Zeng En
The inevitable damage to paint films during coating applications significantly reduces their protective performance, leaving the underlying substrate vulnerable. Developing self-healing coatings is therefore of critical importance. This study presents the synthesis of polyvinyl alcohol (PVA)/polyurea hybrid microcapsules (MCs) loaded with isophorone diisocyanate via interfacial polymerization in an oil-in-water emulsion, with PVA serving as the emulsifier. These microcapsules were incorporated into acrylic resin, along with a dispersant, co-solvent, and isocyanate curing agent, to formulate a microencapsulated self-healing two-component waterborne polyurethane (2 K WPU) coating. The microcapsules were characterized using TG, FTIR, and SEM. The influence of PVA's polymerization degree and alcoholysis degree on microcapsule properties was systematically analyzed. Results indicate that PVA 1799 as an emulsifier yields microcapsules with minimal surface folds and smooth morphology. When 9 wt% of MC 1799 was added to the 2 K WPU coating, the resulting formulation exhibited optimal performance, achieving an average particle size of 29 μm, along with superior self-healing and anti-corrosion properties. This research offers a novel approach for developing high-performance self-healing coatings with potential industrial applications.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF SOLUTION CHEMISTRY
·
2025
·
IF 1.3
Wang Chengfei,Zheng Guangbing,Jiang Shouxiang,Sun Xiangyu,Huang Xin,Xie Wenjun,Li Haoran,Jiang Xia,Wang Guan,Zheng Gengxiu
The solubility of 3,4,5-Trimethoxyphenylacetonitrile (TMB) was measured by employing a static gravimetric method in twelve pure solvents (methanol, ethanol, n -propanol, iso -propanol, n -butanol, 2-butanol, n -hexane, cyclohexane, n -heptane, ethyl acetate, iso -propyl acetate, N,N’ -dimethyl formamide (DMF)) with the temperature ranging from 283.15 to 323.15 K under the atmospheric pressure. The experimental results demonstrated that the mole fraction solubility of TMB increased with the increasing temperature in all systems, and the solubility of TMB is the highest in DMF and lowest in n-heptane. The experimental solubility of TMB was fitted using the modified Apelblat, Wilson, Yaws, and λh models. And the experimental data were agreed well with these models. Furthermore, the results show that the best fitting model was the modified Apelblat model with an average relative deviation of less than 1%. The intermolecular forces between solute and solvent were evaluated by the cohesive energy density obtained by molecular dynamics simulation, and the solubility and compatibility of solute and solvent were predicted. The analysis of Hansen solubility parameters was performed to investigate the similarities between solvents and TMB, thereby improving our understanding of their dissolution behaviors. The thermodynamic properties of the dissolution process are also calculated using the Wilson model. The results show that the dissolution of TMB is an endothermic process driven by enthalpy.
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2025
·
IF 12.1
Zhengyang Li,Yuting Chen,Zhiyuan Guo,Tong Wang,Qi Fan,Yuhang Zhuang,Chenying Li,Mei Yang,Teng Xu,Yanchen Liu,Zhiyuan Li,Qin Sun,Xiaohui Zhu,Hui Xia
Manganese-based oxide cathodes for sodium-ion batteries face irreversible degradation from Mn 3+ Jahn–Teller distortion and Mn 2+ dissolution, compounded by cyclic strain during (de)sodiation. To address this, a P2-K 0.7 Mn 0.8 Ni 0.1 Ti 0.1 O 2 (KMNT) cathode via dual-regulation is developed: K + pillars expand alkali - metal layers enabling fast Na⁺ diffusion, while Ni/Ti co-doping compresses transition-metal layers to suppress Mn migration and Jahn–Teller effect. Besides, the K + pillars in discharged KMNT enhance Mn─O interactions via electrostatic effects, elevating Mn redox potentials and enabling a high average discharge voltage of ≈2.6 V (vs. Na + /Na). Even at a low potential cut-off of 1.5 V, the KMNT cathode demonstrates a reversible specific capacity of 124 mAh g −1 at 1 C with 98% capacity retention after 200 cycles and retains 83% after 900 cycles at a large current density of 10 C, significantly outperforming conventional Mn-based cathodes. Electrochemical and operando tests confirm the dynamic K + /Na + exchange mechanism and absence of Mn 2+ formation, establishing a new paradigm for stable Mn-rich cathodes.
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2011
·
IF 3.068
Wenhui Xiong,Jian Peng,Yongfeng Hu
This paper presents a novel technique integrating bulk-sensitive and surface-sensitive XANES methods to distinguish between physisorption and chemisorption for phosphate adsorption onto ferrihydrite-modified diatomite (FHMD). XANES P K-edge, L-edge, and Fe M-edge spectra were obtained for reference samples (K 2 HPO 4 and FePO 4 ·2H 2 O) and test samples (phosphate adsorbed onto FHMD (FHMD-Ps) and Si-containing ferrihydrite (FHYD-Ps)). A resolvable pre-edge peak in the P K-edge spectra of FHMD-Ps and FHYD-Ps provided direct evidence for the formation of P–O–Fe(III) coordination and the occurrence of chemisorption. The resemblance between the P L-edge spectra of K 2 HPO 4 and FHMD-Ps and the marked difference between the spectra of FHMD-Ps and FePO 4 ·2H 2 O indicated the intact existence of the adsorbate and the adsorbent. The similarity between Fe M-edge spectra of FHMD and FHMD-Ps and the difference between the spectra of FHMD-Ps and FePO 4 ·2H 2 O confirmed the findings from P L-edge analyses. Therefore, chemisorption and physisorption coexisted during phosphate adsorption onto FHMD. Phosphate chemisorption occurred in the deeper zone of FHMD (from 50 nm to 5 μm); whereas physisorption occurred in the zone of FHMD shallower than 50 nm since the probing depth of XANES P K-edge method is 5 μm and that of P L-edge and Fe M-edge methods is 50 nm.
研究领域:
环境化学
·
材料科学
·
表面科学
·
吸附
·
光谱学
✓ 已验证
DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2018
·
IF 5.091
Xianglong Huang,Qiuju Xu,Wei Gao,Tingting Yang,Renming Zhan,Jianhua Deng,Bingshu Guo,Mengli Tao,Hongdong Liu,Maowen Xu
In this work, porous carbon matrix derived from metal-organic frameworks is synthesized by a facile carbonation process for confining element selenium. The Se/nitrogen-doped porous carbon composite is applied as the cathode for rechargeable K-Se batteries for the first time. The abundant and hierarchical porous structure is advantageous in overcoming the volume expansion problem caused by polyselenides during discharge-charge process. The in-situ nitrogen-doped porous carbon enhances electronic conductivity of the cathode composite material. The electrochemical result shows that the as-obtained Se/nitrogen-doped porous carbon composite with Se content of 53% delivers good rate capacity with coulombic efficiency of nearly ∼90% and a reversible cycling capacity of 327 mA h g −1 at 0.2 C, maintaining about 130 mA h g −1 even after 100 cycles.
研究领域:
材料科学
·
电化学
✓ 已验证
DOI
PubMed
高影响因子
MATERIALS LETTERS
·
2016
·
IF 2.437
Hongfeng Tang,Guang-Xin Chen,Qifang Li
Polymer composites with a high dielectric constant (high-k) and low dielectric loss represent an important research topic for the rapid development of electronic industries. This paper reports on a type of high-k composite with low dielectric loss (dielectric constant is approximately 152, and dielectric loss is only 0.06 at 10 kHz) through a compounded epoxy resin with homemade core-shell-structured carbon nanotube (CNT) hybrids. The composite is prepared by in situ controlled free-radical copolymerization of divinylbenzene and glycidyl methacrylate on the surface of CNTs. The reactive shell contained epoxy groups that play a dual role in keeping the low dielectric loss of the composites and high dispersibility of the coated CNTs. The coated CNTs with proper thickness (about 30 nm) and epoxy value (0.011 mol/g) were selected to prepare the composites.
研究领域:
材料科学
·
电子工程
✓ 已验证
DOI
高影响因子
MATERIALS & DESIGN
·
2020
·
IF 6.289
Wen-Dong Li,Chao Wang,Zhi-Hui Jiang,Lun-Jiang Chen,Yan-Hui Wei,Li-Yuan Zhang,Ming-Yu Chen,Xiong Yang,Guan-Jun Zhang
Stereolithography (SL) is a promising 3D printing method for the fabrication of high dielectric constant polymer matrix composites (high- k PMCs) because of its high geometric accuracy and few manufacturing defects. However, the presence of ceramic filler destroys the fluidity and transparency of high- k PMCs, reducing their 3D printability. In this study, we fabricated barium titanate microspheres (BT-S) to facilitate the SL-based 3D printing of high- k PMCs using radio-frequency thermal plasma spheroidization (RF-TPS) technology. Experimental results showed that the prepared BT-S particles have spherical shape, smooth surface, large particle size, improved mechanical strength and higher purity, which lead to the enhancement in the 3D printability of UV curable high- k composites: i) the employment of BT-S significantly reduces the apparent viscosity and yield stress; and ii) the UV curing depth increased by 542% maximum. As a result, high- k composites were successfully printed using digital light processing (DLP) technique under low UV light energy. Moreover, the increase of dielectric constant was experimentally verified, which is explained by electrostatic energy increment according to finite element method (FEM) simulations. This study provided an effective approach (i.e. RF-TPS technology) to enhance the 3D printability of high- k PMCs, and also promoted the usage of SL-based 3D printing in advanced electrical and electronic components
研究领域:
材料科学
·
电气工程
✓ 已验证
DOI
高影响因子
ZEITSCHRIFT FUR NATURFORSCHUNG SECTION A-A JOURNAL OF PHYSICAL SCIENCES
·
2023
·Vol. 78
·期 10
·921-926
·
IF 1.8
Cong Liu,Junshen Xing,Zheng Liu,Wenlin Feng
BaSr 2 (PO 4 ) 2 : 4 %Eu 3+ , 4 % A ( A = Li + , Na + , K + ) phosphors were prepared by high-temperature solid-phase method. The crystal structure, photoluminescence properties, thermal stability, chromaticity coordinates, and fluorescence lifetime of the samples were investigated. The excitation and emission spectra of the samples are broadbands and the maximum peak of the emission spectrum is located at 619 nm. Among three charge compensators, the luminescence intensity is optimal for Li + co-doping case, and the quenching temperature of the typical sample is about 500 K. the fluorescence lifetime
τ
is 1469.6 ns, and the chromaticity coordinates exhibit a strong red emission. The present phosphor has a potential application for white light-emitting diodes (LEDs) under the near-ultra violet (n-UV) light excitation.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
RUSSIAN JOURNAL OF INORGANIC CHEMISTRY
·
2022
·Vol. 67
·期 4
·533-538
·
IF 1.667
Jiang Zhen-Zhen,Liu Gao-Ling,Li Ming-Li,Guo Ya-Fei,Meng Ling-Zong,Duo Ji,Deng Tian-Long
Abstract To better use rare earth element resources in geothermal water, it is essential to understand the volumetric property and the ion-interaction of the rare earth element aqueous solution systems. In this paper, the densities of aqueous Y 2 (SO 4 ) 3 from 0.00405 to 0.04071 mol kg −1 at 283.15 to 363.15 K were measured using an Anton Paar Digital vibrating-tube densimeter. Apparent molar volumes ( V ϕ ) and the coefficient of thermal expansion (α) were obtained based on the experimental density data, and the diagrams of the apparent molar volume and coefficient of thermal expansion of Y 2 (SO 4 ) 3 (aq) against temperature ( T ) and molality ( m ) in the binary system were revealed. The Pitzer single-salt parameters \({{(\beta }}_{{{\text{MX}}}}^{{(0)v}},{{\beta }}_{{{\text{MX}}}}^{{(1)v}},{{\beta }}_{{{\text{MX}}}}^{{(2)v}}\,\,{\text{and}}\,\,C_{{{\text{MX}}}}^{v})\) for Y 2 (SO 4 ) 3 and their temperature-dependent correlation F ( i , p , T ) = a 1 + a 2 ln( T /298.15) + a 3 ( T − 298.15) + a 4 /(620 − T ) + a 5 /( T − 227) (where T is temperature in Kelvin, a i are the correlation coefficients) for Y 2 (SO 4 ) 3 were obtained for the first time.
研究领域:
化学
·
物理化学
·
地质学
✓ 已验证
DOI
高影响因子
CHEMOSPHERE
·
2022
·
IF 8.943
Haiqing Wang,Zhenda Liang,Chao Liu,Lishan Zhu,Yongtao Xu,Li Zhou,Bing Yan
Developing low-cost and efficient materials for dye pollutant removal under mild condition remains a great challenge. Here K + and Tb 3+ co-doped porous MnO 2 (K–Tb–MnO 2 ) nanoparticles with tailored properties including crystal structure, surface area and catalytic activity have been synthesized. Experimental results reveal that K–Tb–MnO 2 nanoparticle has higher specific surface area, Mn 3+ content and surface oxygen vacancies than pristine MnO 2 nanoparticle and single-doped MnO 2 materials, showing the uniqueness of dual-doped metal ions . Using methyl blue (MB) as a model pollutant, its removal efficiency by K–Tb–MnO 2 nanoparticles within 5 min is 93.6%, which is 18, 8.3, and 2.9 times higher than that of MnO 2 , K–MnO 2 , and Tb–MnO 2 nanomaterials, respectively. Oxalic acid triggered MnO 2 material dissolving assay and FT-IR spectrum suggested that remarkable performance of K–Tb–MnO 2 nanoparticle toward MB removal can be attributed to a combined effect of adsorption (16% MB removal) and catalytic degradation (84% MB removal). Moreover, K–Tb–MnO 2 nanoparticle mediated MB degradation is demonstrated to be a combination of non-radical oxidation by Mn 3+ and radical-participated degradation, with 1 O 2 as the main species. And the intermediates and pathways of MB degradation were studied by liquid chromatography-mass spectrometry. Importantly, cell viability experiment suggests that the toxicity of MB dye could be efficiently alleviated after the treatment with K–Tb–MnO 2 nanoparticle. These results demonstrate the great potential of the novel K–Tb–MnO 2 particles to be used as a highly effective nanomaterials to reduce the risk of dye wastes toward the environment and human health.
研究领域:
环境科学
·
材料科学
·
生物学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2021
·
IF 2.694
Yun-Yun Gao,Xiao-Feng Guo,Lan-Rong Zhao,Shi-Hua Sang
The stable phase equilibria of the ternary system MgBr2 + SrBr2 + H2O at 288 and 308 K were studied with the isothermal dissolution equilibrium method. The compositions of solutions and solid phases have been determined and the equilibrium solid phases at the invariant points were identified with the aid of the X-ray diffraction method. The phase diagrams of this system at 288 and 308 K were both constructed in terms of experimental results. Two stable phase diagrams show that this system is hydrate type I at two temperatures without formation of a solid solution or complex salt. Both the phase diagrams are composed of one invariant point, two univariate curves, and two crystallization regions (SrBr2·6H2O and MgBr2·6H2O). The equilibrium solid phases of the invariant point at 288 and 308 K are both SrBr2·6H2O and MgBr2·6H2O, respectively. Combining the Pitzer single-salt parameters of MgBr2 and SrBr2 reported in the literatures, the unreported mixing ion-interaction parameters θMg,Sr and ΨMg,Sr,Br at 288 and 308 K were fitted with the measured values in this study using the Pitzer equations. The agreement between the experimental values and calculated results in the ternary system MgBr2 + SrBr2 + H2O at 288 and 308 K shows that the parameters fitted with solubilities are reliable.
研究领域:
化学
·
物理化学
✓ 已验证
DOI
高影响因子
JOURNAL OF CHEMICAL AND ENGINEERING DATA
·
2021
·
IF 2.694
Yan Shi,Shui Wang,Jidong Wang,Tingting Liu,Yixin Qu
In this work, the solubility of amitriptyline hydrochloride (AMT) in 13 monosolvents was experimentally measured in the temperatures ranging from 283.15 to 323.15 K under atmospheric pressure with the aid of laser dynamic solubility monitor devices. The solubility as a function of temperature in different monosolvents was regressed using two activity coefficient models (Wilson and nonrandom two liquid (NRTL)) and three semiempirical equations (modified Apelblat, three-parameter Van’t Hoff, and λh), Based on the solubility data and the regression parameters of the Wilson model, the mixing thermodynamic properties (mixing Gibbs energy, mixing enthalpy, mixing entropy) as well as the activity coefficient and the reduced excess enthalpy at infinitesimal concentration were evaluated.
研究领域:
药学
·
物理化学
·
热力学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）