JOURNAL OF SOLID STATE CHEMISTRY
·
2024
·
IF 3.2
Hui Li,Shuang Li,Yanhong Wang,Yaling Dou,Hongcheng Lu
We prepared a layered antiferromagnet KNiB 4 O 6 F 3 1 by hydrothermal synthesis, and characterized its structure and physical properties by X-ray diffraction, magnetization and specific heat measurements as well as thermal stability, FTIR and UV–vis–NIR measurements. 1 consists of layers of composition [NiB 4 O 6 F 3 ] - separated by layers of K + cations. And Ni 2+ ions are arranged in slightly distorted triangular pattern in each [NiB 4 O 6 F 3 ] - layer. The magnetic susceptibility measurements indicate no divergence between the zero-field-cooled and field-cooled curves down to 7.9 K, below which a long-range order takes place as verified by specific heat measurements. The M ( H ) curve linearly increases when the field is weak (below ∼2 T), confirming that the ground state of 1 is antiferromagnetic. At 7 T, the magnetization of 1 is 1.67 μ B which is lower than the saturation magnetization.
研究领域:
材料科学
·
固体物理
·
无机化学
·
磁学
·
晶体学
✓ 已验证
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2017
·
IF 2.084
Yanli Ma,Ling He
Organic-inorganic hybrid is prepared by grafting nano-scaled methacrylisobutyl polyhedral oligomeric silsesquioxane (MA-POSS) onto glycidyl methacrylate (GMA) via the combining of free radical polymerization , epoxy opening reaction and atom transfer radical polymerization (ATRP) techniques. The obtained (MA-POSS)-pendanted epoxy hybrid, PGMA- g -P(MA-POSS), are discussed fot their highly thermo-mechnical property, hydrothermal resistance and permeability based on the self-assembled micelles . In THF solution, PGMA- g -P(MA-POSS) could self-assembly into 110–800 nm sphereric core-shell micelles , while, the pre-curing PGMA- g -P(MA-POSS) distributes 60–600 nm core-shell micelles because the developed three-dimensional network structure makes the PGMA chains twining and cross-linking tightly leading to the shrinkage of particles. These self-assembled micelles have provided the casted films with 0.19–14.4 nm surface roughness , significant water resistance (SCA = 113-123°), high thermal stability ( T d = 300–600 °C) and strong adhesive strength (216–333 N). Compared with the poor adhesive strength for commercial epoxy resin (E-51) decreased from 393 N to 28 N after 15 hydrothermal cycles, the obtained PGMA- g -P(MA-POSS) displays super thermal endurance properties and humidity resistance by keeping a relative constant adhesive strength (from 340 N to 337 N). Furthermore, PGMA- g -P(MA-POSS) also gives much better permeability to the protective treated sandstone than E-51. Therefore, PGMA- g -P(MA-POSS) is prospected to serve as coatings with great potential applications.
研究领域:
材料科学
·
高分子化学
·
纳米复合材料
·
表面工程
·
涂层技术
·
聚合物科学
·
功能材料
✓ 已验证
DOI
高影响因子
Frontiers of Chemical Science and Engineering
·
2024
·Vol. 18
·期 3
·1-12
·
IF 4.3
Nie Shibin,Zhao Zongquan,Xu Yuxuan,He Wei,Zhai Wenli,Yang Jinian
To enhance the fire safety and wear resistance of epoxy, phosphorus-containing nickel phyllosilicate whiskers (FP-NiPS) were synthesized using a facile hydrothermal technology, with 9,10-dihydro-9-oxa-10-phosphaphenanthrene as the organic modifier. The impacts of FP-NiPS on the thermal stability, flame retardancy, and mechanical and tribological properties of EP composites were explored. The findings demonstrated that 5 wt % FP-NiPS elevated the limiting oxygen index of the EP composite from 23.8% to 28.4%, achieving a V-0 rating during vertical burning tests. FP-NiPS could enhance the thermal stability of epoxy resin (EP) and facilitate the development of a dense and continuous carbon layer, thereby significantly improving the fire safety of the EP composites. The FP-NiPS led to an 8.2% increase in the tensile strength and a 38.8% increase in the elastic modulus of the EP composite, showing outstanding mechanical properties. Furthermore, FP-NiPS showed remarkable potential in enhancing the wear resistance of EP. The wear rate of 1 wt % FP-NiPS is 2.34 × 10 −5 mm 3 ·N −1 ·m −1 , a decrease of 66.7% compared to EP. This work provides a novel promising modification method to enhance the fire safety, mechanical and wear resistance properties of EP.
研究领域:
材料科学
·
高分子科学
·
化学工程
·
机械工程
·
消防安全工程
✓ 已验证
DOI
高影响因子
IONICS
·
2020
·Vol. 26
·期 11
·5471-5480
·
IF 2.394
Pan Fusheng,Qiao Lina,Yuan Biao,Duan Cuijia,Wang Jianjie,Wu Wei,Lin Quanfan,Shi Yake,Chen Zan,Jiang Zhongyi
Poly(m-phenylene isophthalamide) (PMIA) membranes are promising heat-tolerant separator candidates of lithium-ion batteries (LIBs), while their wettability toward carbonate electrolyte and corresponding batteries performance are not desirable. Herein, PMIA membranes coated with ultrathin mussel-inspired polydopamine (PDA) layer were fabricated as separators in LIBs. The introduced amino, quinonyl, and catechol groups in PDA coating could enhance the wettability of the resultant PMIA-PDA separator toward electrolyte. The PMIA-PDA separator had excellent thermal stability, showing a thermal shrinkage of 5.2% at 200 °C. The contact angle of the thermal-treated PMIA-PDA separator could maintain at 26.1°, which decreased by 42.7% compared with the pristine PMIA separator. The PMIA-PDA separator also displayed a high ionic conductivity (0.86 mS cm −1 ) and a low interfacial electric resistance (62.4 Ω). Consequently, the assembled LiCoO 2 /PMIA-PDA/Li battery achieved good cyclic stability with the capacity retention of 84.3% (121.1 mAh g −1 ) after 100 cycles under 30 °C. More significantly, the relevant capacity retention remained at 89.0% (127.5 mAh g −1 ) under 60 °C, which implied a great potential of PMIA-PDA membranes as separators of high-safety LIBs.
研究领域:
材料科学
·
电化学
·
储能技术
·
高分子科学
·
表面工程
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2023
·
IF 10.9
Yi-bo Zhang,Ji-Sheng Liang,Chengyan Liu,Qi Zhou,Zhe Xu,Hong-bo Chen,Fu-cong Li,Ying Peng,Lei Miao
P-type Mg 3 Sb 2 -based Zintls have attracted considerable interest in the thermoelectric (TE) field due to their environmental friendliness and low cost. However, compared to their n-type counterparts, they show relatively low TE performance, limiting their application in TE devices. In this work, we simultaneously introduce Bi alloying at Sb sites and Ag doping at Mg sites into the Mg 3 Sb 2 to cooperatively optimize the electrical and thermal properties for the first time, acquiring the highest ZT value of ∼0.85 at 723 K and a high average ZT of 0.39 in the temperature range of 323–723 K in sample Mg 2.94 Ag 0.06 Sb 1.9 Bi 0.1 . The first-principle calculations show that the co-doping of Ag and Bi can shift the Fermi level into the valence band and narrow the band gap, resulting in the increased carrier concentration from 3.50 × 10 17 cm −3 in the reference Mg 3 Sb 0.9 Bi 0.1 to ∼7.88 × 10 19 cm −3 in sample Mg 2.94 Ag 0.06 Sb 0.9 Bi 0.1 . As a result, a remarkable power factor of ∼778.9 µW m − 1 K − 2 at 723 K is achieved in sample Mg 2.94 Ag 0.06 Sb 0.9 Bi 0.1 . Meanwhile, a low lattice thermal conductivity of ∼0.48 W m − 1 K − 1 at 723 K is also obtained with the help of phonon scattering at the distorted lattice, point defects, and nano-precipitates in sample Mg 2.94 Ag 0.06 Sb 0.9 Bi 0.1 . The synergistic effect of using the multi-element co-doping/-alloying to optimize electrical properties in Mg 3 Sb 2 holds promise for further improving the TE performance of Zintl phase materials or even others.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Hongshi Zhang,Jiyou Zhong,Fu Du,Lei Chen,Xiaoli Zhang,Zhongfei Mu,Weiren Zhao
Broad-band near-infrared (NIR) phosphors are essential to assembling portable NIR light sources for applications in spectroscopy technology. However, developing inexpensive, efficient, and thermally stable broad-band NIR phosphors remains a significant challenge. In this work, a phosphate, KAlP2O7, with a wide band gap and suitable electronic environment for Cr3+ equivalent substitution was selected as the host material. The synthesized KAlP2O7:Cr3+ material exhibits a broad-band emission covering 650–1100 nm with a peak centered at 790 nm and a full width at half-maximum (fwhm) of 120 nm under 450 nm excitation. The internal quantum efficiency (IQE) was determined to be 78.9%, and the emission intensity at 423 K still maintains 77% of that at room temperature, implying the high efficiency and excellent thermal stability of this material. Finally, a NIR phosphor-converted light-emitting diode (pc-LED) device was fabricated by using the as-prepared material combined with a 450 nm blue LED chip, which presents a high NIR output power of 32.1 mW and excellent photoelectric conversion efficiency of 11.4% under a drive current of 100 mA. Thus, this work not only provides an inexpensive broad-band NIR material with high performance for applications in NIR pc-LEDs but also highlights some strategies to explore this class of materials.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
Surface Topography-Metrology and Properties
·
2024
·Vol. 12
·期 2
·025016
·
IF 2
Shengli Chen,Jiyuan Zhu
Rapid corrosion rate is limiting the engineering application of magnesium alloys. In this paper, an attempt was made to produce a corrosion resistant coating on the surface of AZ91D magnesium alloy using hydrothermal method. The coating surface is covered with microspheres and has a dense structure, which effectively isolates the contact between the outside world and the substrate. The corrosion potential(E) raised from −1.57 V to −0.45 V compared to the bare sample. The corrosion current density and corrosion rate of the coating can be reduced by 6 orders of magnitude, and the polarization resistance raised by 6 orders of magnitude. The thickness of the coating is 45.4 μm at the moment, with a minimum of defects on the surface, resulting in excellent corrosion resistance in the immersion test. The coating also has good adhesion strength at 4B, which can expand the application range of magnesium alloy in corrosive environments.
研究领域:
材料科学
·
腐蚀与防护
✓ 已验证
DOI
高影响因子
MATERIALS RESEARCH BULLETIN
·
2024
·
IF 5.3
Haixia Zheng,Xianju Zhou,Siyu Li,Li Li,Yan Deng,Jiaju Huang,Yan Yan
A series of MgMoO 4 : x%Er 3+ ( x = 0, 1, 2, 3, 4, 5) phosphors were synthesized by high temperature solid-state reaction. The doping concentration of Er 3+ was optimized, and the thermometric properties of the phosphors were investigated based on the thermally coupled energy levels of Er 3+ ( 2 H 11/2 and 4 S 3/2 ) via the luminescence intensity ratio (LIR) technology. The absolute sensitivity (S A ) and relative sensitivity (S R ) of the samples were investigated with the maximum S R being 0.83% K −1 . To maintain the electrical neutrality of the phosphors and reduce lattice distortion of the hosts, a certain amount of charge compensators (Li + , Na + , K + ) were introduced into the phosphors. The luminescent intensity of the phosphors was enhanced greatly, and the thermometric properties were improved slightly with the maximum S R at 0.89% K −1 by the charge compensators.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2021
·
IF 3.599
Ye Zhang,Xue Lou,Xiaochun Chi,Quan Wang,Ning Sui,Zhihui Kang,Qiang Zhou,Hanzhuang Zhang,Li Li,Yinghui Wang
The temperature-dependent time-resolved spectroscopies are employed to investigate the hot carrier characteristics in MAPbBr 3 nanocrystals (NCs). Simultaneously, the absorption and photoluminescence data exhibits that MAPbBr 3 NCs pass through cubic phase and tetragonal phase in turn as the temperature drops. As the phase transition from the cubic phase to the tetragonal phase, the band gap narrows, the shallow defects population that participates in the carrier dynamics and the Longitudinal-optical phonon energy ( E LO ) decreases. We uncovered that the hot carrier can be induced in the MAPbBr 3 NCs through changing the photon flux and the temperature. Moreover, the hot carrier cooling time and the carrier heating effect in tetragonal phase improved in comparison with those in cubic phase, owing to the influence of bandgap, shallow defect and E LO as mentioned above. These results can help us to further understand the hot carrier characteristics in the perovskite MAPbBr 3 NCs for designing and optimizing the perovskite-based optoelectronic devices of high performance.
研究领域:
材料科学
·
光学
✓ 已验证
DOI
高影响因子
JOM
·
2023
·Vol. 76
·期 3
·1467-1476
·
IF 2.6
Xia Chengcheng,Liu Zhanwei,Yan Hengwei,Liu Qiang,Li Mengnan,Lan Jinghao
Spent anodes (butts) are the remaining portion of prebaked anodes after consumption, which are reintroduced into the production of prebaked anodes after treatment. Among these residues, the main harmful element, sodium, tends to accumulate with the repeated recycling of the butts. This accumulation increases the air reactivity of prebaked anodes and consequently reduces their quality. In this study, aluminum sulfate hydrothermal acid leaching was used to remove sodium from the butts. The effects of leaching temperature, Al 3+ concentration, leaching time, and liquid-to-solid ratio on the removal of sodium from the butts were investigated. The sodium removal rate reached 99.42% at a leaching temperature of 90°C, an Al 3+ concentration of 1.5 mol/L, a leaching time of 2.5 h, and a liquid-to-solid ratio of 25 mL/g. This method significantly reduced the sodium content in the butts, offering a new approach for the high-quality recovery of the butts.
研究领域:
冶金工程
·
环境科学
✓ 已验证
DOI
高影响因子
HIGH PERFORMANCE POLYMERS
·
2025
·
IF 1.6
Zihao Wu,Jian Wang,Jiaxin Liu,Jinhua Lei,Heran Nie,Qiliang Yuan,Zhipeng Wang,Liang Li
Aromatic polyesters are an attractive class of engineering thermoplastics with excellent chemical properties, thermal stability and environmental stability, as well as good optical properties, but they have rarely been reported. Refractive index (RI) is one of the properties commonly used to compare the optical properties of materials. The higher the refractive index, the thinner the lens made of the corresponding material; however, the preparation of high-refractive-index polymers is currently a thorny issue, in which the structure of the polymer molecules has a great impact on their refractive index, to design high-refractive-index materials requires starting from the structure of the molecules. Phenolphthalein has a unique structure with a molecular skeleton consisting of three benzene rings and a cyclic lactone that exhibits a twisted non-coplanar structure. This cyclic side group can hinder the accumulation between the polymer molecular chains, not only improving the solubility of the polymer molecules, but also increasing the transparency of the polymer films. In this work, we used phenolphthalein (PHT) and its derivatives to polymerize with terephthaloyl chloride (TPC), respectively, through the structural differences between them, the influence of polymer structure on the refractive index and thermal properties was discussed. Among them, polyester PAR-NPHT had the highest refractive index (nd>1.67), and is expected to be a new generation of optical materials.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
POLYMER
·
2021
·
IF 4.43
Yadi Liu,Sheng Zhou,Ning Zhao,Jian Xu,Zhihao Shen,Xing-He Fan,Qi-Feng Zhou
A series of aramids containing hydroxyl side group (NOM-OH c , where c is the molar fraction of hydroxyl substitution in the polymer, and c = 0, 10, 20, 40, 60, 80, 100) were synthesized by direct high-temperature polycondensation . The synthesis employed a facile process. The monomer , 4,4'-(terephthaloylbis(azanediyl))bis(2-hydroxybenzoic acid), was prepared simply via an esterification reaction. The chemical structures of the soluble aramids were confirmed by 1 H NMR. And the molecular weight and mass dispersity of the aramids were obtained by size exclusion chromatography , instead of the traditional intrinsic viscosity method. The use of unsymmetrical monomers and the introduction of hydroxyl side group into the aramid structure decrease the conjugation of the polymer main chain, and thus the resulting aramid has excellent solubility in relatively polar solvents , such as N -methy-2-pyrrolidone, dimethylsulfoxide , N , N -dimethylacetamide, and N , N -dimethylformamide. As a result, the molding processability of the aramids and their composites is greatly improved. For example, films can be made by solution spinning and casting. The films have good mechanical strength , with tensile strength , tensile modulus , and elongation at break in the range of 68–95 MPa, 2.65–3.12 GPa, and 5–10%. The thermal resistance of the aramids is still quite good, with 5% weight loss temperatures in nitrogen and in air in the range of 360–430 °C.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）