ACS Applied Engineering Materials
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2022
·
IF 0
Xiao-Lu Pu,Xi Luo,Jia-Hui Chen,Shao-Dong Xu,Song Gu,Yu-Zhong Wang,Li Chen
2D@0D multidimensional nanoparticles (WC@TDP) were first prepared by decorating WS2 2D nanosheets (WC) with titanium diphenylphosphonate (TDP) 0D nanoparticles, which were derived from the hybridization of diphenylphosphinic acid and TiO2. The chemical structure and micromorphology of the modified 2D nanosheet were confirmed, and TDP nanoparticles were tightly attached to the exfoliated WC nanosheets through noncovalent interactions. Afterward, WC@TDP was incorporated into the epoxy resin (EP), showing the improved dispersion and distribution in the thermosetting matrix. Because TDP exhibits catalytic charring activity and WC acts as a physical barrier, such EP/WC@TDP nanocomposites exhibited the enhanced fire safety, including flame retardation and smoke suppression during burning. The composite containing 8 wt % WC@TDP passed UL94 V-0 rating with a limiting oxygen index increased from 26.0 to 34.0 vol %. Compared with those of neat EP, the peak heat release rate, total heat release rate, and total smoke release of EP/8WC@TDP were reduced by 42%, 17%, and 38%, respectively, without sacrificing the mechanical properties of the nanocomposites.
研究领域:
材料科学
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化学工程
·
高分子化学
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火灾防护
✓ 已验证
DOI
Journal of Inorganic and Organometallic Polymers and Materials
·
2017
·Vol. 27
·期 1
·101-109
·
IF 1.577
Li Qian,Liu Li,Zhong Xin-Xin,Li Fa-Bao,Asiri Abdullah M.,Alamry Khalid A.,Zhu Nian-Yong,Wong Wai-Yeung,Qin Hai-Mei
Abstract A series of neutral luminescent tetranuclear and mononuclear copper(I) halide complexes, [Cu 4 I 4 (dpna) 4 ] ( 1 ) and [CuX(dpna) 2 ] dpna = 1-(diphenylphosphino)naphthalene, X = Br ( 2 ), Cl ( 3 ), were synthesized, and their molecular structures and photophysical properties were investigated. Complex 1 has a cubane-like structure with four Cu atoms pseudo -tetrahedral and four I atoms serving as μ 3 -bridges. The coordination geometry of the copper centers in 2–3 are trigonal-planar. In the solid state, complexes 1–3 display blue photoluminescence (λ max = 423–463 nm) at 298 K. The emission of the complexes originate from the (σ+X)→π* transition. All three complexes displayed good thermal stability. Graphical Abstract
研究领域:
无机化学
·
材料科学
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产品关联
DOI
高影响因子
POLYHEDRON
·
2022
·
IF 2.975
Aihong Li,Dongyang Li,Qing Liu,Nan Yang,Yinming Li,Yawei Zhang,Jianping Guo,Bo Liu
The fourth period post transition metal (Ni, Cu, Zn) diphenylphosphinate complexes were synthesized by solvothermal method. Based on the characterization of the complexes by SEM, XRD, IR, XPS, EA, TG and UV–Vis DRS, the catalytic properties of three compounds were studied by photocatalytic ethanol for H 2 production. The result showed the quantity of H 2 evolution by nickel, copper and zinc diphenylphosphinate were ca. 24.8 μmol/g, 45.9 μmol/g and 0 μmol/g for 3 h, respectively. By analyzing the relationship between photocatalytic mechanism and central ion structure, the reason for the obvious gap in photocatalytic activity of complexes has been investigated.
研究领域:
材料科学
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化学工程
·
能源科学
✓ 已验证
DOI
高影响因子
POLYHEDRON
·
2020
·
IF 2.343
Aihong Li,Dongyang Li,Junping Han,Ruide Xue,Bo Liu,Jianping Guo
The fibrous coordination polymer cobalt(II) diphenylphosphinate was prepared by solvothermal method , and its chemical composition was characterized by XPS , ICP-MS, IC and EA. The surface morphology was analyzed by SEM and TEM . It is found that the diameter of the fiber ranges varies from hundreds of nanometers to several microns and formation of the fiber is due to the twisting of one-dimensional polymeric molecular chains. The crystalline structure of the fibrous polymer was characterized by XRD . The TG curve indicated that the fiber has a higher decomposed temperature. The fibrous compound has lower density compared with the crystalline form of the same composition. The hydrogen production activity of ethanol decomposition photocatalyzed by the cobalt(II) Diphenylphosphinate was explored under UV–visible light irradiation and the quantity of H 2 evolution was ca. 165.345 μmol/g for 3 h. The catalyst showed good stability and cyclability in the photocatalytic process.
研究领域:
材料科学
·
化学
✓ 已验证
DOI
高影响因子
Journal of Sulfur Chemistry
·
2020
·
IF 1.963
Lin Yan,Jun Yang,Xu-Feng Liu,Yu-Long Li,Xing-Hai Liu,Zhong-Qing Jiang
In this article, two new binuclear iron compounds [Fe2(CO)5PPh(C6H11)2{µ-SCH2CH(CH2CH3)S}] (2) and [Fe2(CO)5PPh2(C6H11){µ-SCH2CH(CH2CH3)S}] (3), which can be regarded as the biomimics for the active site of [FeFe]-H2ases, have been synthesized by CO exchange of compound [Fe2(CO)6{μ-SCH2CH(CH2CH3)S}] (1) with cyclohexyldiph-enylphosphine or dicyclohexylphenylphosphine and their structures have been confirmed by spectroscopy, elemental analysis, and X-ray crystallography. They also exhibited good electrocatalytic activities for the generation of H2.
研究领域:
无机化学
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材料科学
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生物无机化学
✓ 已验证
DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
·
2023
·
IF 5.9
Congcong Zhai,Wenchao Zhang,Rongjie Yang
Epoxy resin (EP) is one of the most widely used thermosetting resins. Developing EP with high-comprehensive properties still holds great significance. Thus, a novel bis(diphenylphosphinyl)-containing pyromellitimide (abbreviated as DTPMI) was synthesized as a multi-functional additive for EP. Compared with pure EP, 6 wt.% of DTPMI could increase the limited oxygen index (LOI) value of the EP/6DTPMI from 23.0 % to 28.5 %, with a 30.5 % reduction in the peak heat release rate. The satisfactory flame retardancy for the EP/6DTPMI was attributed to the formation of a thermal oxidation-resistant char layer during the combustion, effectively reducing the material’s burning intensity and fire hazard. Surprisingly, the dielectric constant and loss of the EP/6DTPMI could be significantly reduced to 2.69 and 0.0527 at 10 MHz, respectively. Also, its contact angle to water was raised from 63.1° (pure EP) to 92.4°, decreasing the surface moisture absorption of the EP/DTPMI thermosets. Besides, the incorporation of DTPMI hardly deteriorated the thermal and mechanical properties of the EP/DTPMI thermosets. This work provided a feasible approach for fabricating the EP thermosets with high-comprehensive performance, especially for flame retardancy and dielectric performance, and proposed potential application prospects of the EP/DTPMI thermosets.
研究领域:
材料科学
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化学工程
·
高分子科学
✓ 已验证
产品关联
DOI
高影响因子
Advanced Optical Materials
·
2022
·Vol. 10
·期 12
·2102619
·
IF 10.05
Binbin Su,Jiance Jin,Yinhui Peng,Maxim S. Molokeev,Xiaobao Yang,Zhiguo Xia
The discovery of rare-earth free luminescent materials with blue-light-excitable characteristic is of great importance for solid-sate lighting applications. Herein, a Cu(I)-based 0D luminescent hybrid ( 1,3-dppH 2 ) 2 Cu 4 I 8 ∙H 2 O is synthesized by a facile solution method, and it shows the orange-red emission peaking at 625 nm upon 460 nm excitation. The structure-related luminescence mechanism has been elaborated by experimental and theoretical investigations. Moreover, the emission intensity remains unchanged even after continuous water treatment for 60 days due to the improved structural stability originating from intermolecular π–π interaction between organic cations. A warm white light-emitting diode (LED) device with the color rendering index of 91.4% has been fabricated by combining the 440 nm LED chip, green-emitting Lu 3 Al 5 O 12 :Ce 3+ , and ( 1,3-dppH 2 ) 2 Cu 4 I 8 ∙H 2 O. This work provides a new design route towards 0D cuprous halide materials and will initiate more exploration of their intrinsic luminescence mechanism.
研究领域:
材料科学
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光电
·
固态照明
✓ 已验证
DOI
高影响因子
Molecular Catalysis
·
2020
·
IF 3.687
Kaikai Liu,Tiefeng Wang,Minghan Han
The catalytic isomerization of 2-methyl-3-butenenitrile (2M3BN), a model reaction in the DuPont process, has been performed using NiL 4 (L=tri- O - p -tolyl phosphite) as a catalyst. The lowered catalytic activity in the isomerization with coexistence of 2-pentenenitrile (2PN) and 2-methyl-2-butenenitrile (2M2BN) indicates that both 2PN and 2M2BN are the catalyst inhibitors , and the quantitative relationship between the conversion of 2M3BN and the content of 2M2BN and 2PN is provided. DFT calculation results suggest that the inhibition effect is attributed to the generation of dead-end intermediates (2PN)NiL 2 and (2M2BN)NiL 2 , both of which take nickel atom out of the catalytic cycle in the isomerization process. To suppress the inhibition effect, new catalytic intermediates are rationally designed based on their computational %V bur . An efficient method that adding extra ligand 1, 5-bis(diphenylphosphino)pentane (dppp5) to the NiL 4 catalyst is selected experimentally. Compared to the results obtained with NiL 4 as catalyst, the (dppp5)NiL 2 increases the conversion of 2M3BN from 74.5 % to 93.4 % at 3 h of reaction and provides a high selectivity to 3PN (> 98 %) at optimal conditions.
研究领域:
催化
·
有机化学
·
计算化学
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产品关联
DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2023
·Vol. 35
·期 1
·e6238
·
IF 3.4
Ben Hu,Jun Wang,Xi Chen,Jingsheng Wang,Shuang Yang,Lu Zhu,Lanian Zou,Siqi Huo
This work reported a flame-retardant, single-component epoxy resin (EP) via introducing diphenylphosphine (DPP) and benzimidazolyl-substituted cyclotriphosphazene (BICP) into EP. The differential scanning calorimetry (DSC) test showed that the onset curing temperature of DPP/BICP-15/10 was 50°C lower than that of BICP-12 due to the catalytic decomposition effect of DPP toward BICP under heating. Besides, the shelf life of DPP/BICP-15/10 at room temperature reached ~14 days, demonstrating good storage stability. EP/DPP/BICP maintained satisfactory thermal properties and showed excellent flame retardancy with a UL-94V-0 classification. Compared with the unmodified EP sample, the peak heat release rate (PHRR) and total heat release (THR) of DPP/BICP-15/13 were decreased by ~68.1% and ~55.1%, respectively. Hence, this flame-retardant, single-component epoxy resin with satisfactory comprehensive properties exhibited great potential for versatile industrial applications.
研究领域:
材料科学
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化学工程
·
高分子科学
✓ 已验证
DOI
高影响因子
ChemistrySelect
·
2024
·Vol. 9
·期 46
·e202404170
·
IF 1.9
Pengtao Sheng,Haiyan Xu,Yaqi Zhang,Haiyue Xia,Haipeng Liu,Weili Li
Graphical We present a surfactant-associated controlled synthesis of copper (Cu)-deficient zinc (Zn)-doped Cu-indium (In)-selenium (Se) QDs, followed by a mechanistic investigation of their photophysical properties using surfactants. The findings described here are expected to provide a general strategy for enhancing the tunability of photophysical properties in other QDs systems. The shape and size-controlled synthesis of colloidal I−III−VI quantum dots (QDs) can be attained only by a few synthesis strategies via the introduction of various high-boiling-point organic surfactants. To further investigate this strategy, in this study, we present a surfactant-associated controlled synthesis of copper (Cu)-deficient, zinc (Zn)-doped Cu─indium (In)─selenium (Se) QDs, followed by a mechanistic investigation of their photophysical properties using surfactants, such as oleylamine (OLA), oleic acid (OA), and diphenylphosphine (DPP). OLA significantly promoted the quantum size effect-resultant emission wavelength red-shift, while OA controlled the homogeneous growth of QDs and improved the quantum yields. Moreover, Gaussian deconvolution of the photoluminescence spectra and the bandgap derived from the absorption spectra, by fitting, supported the fact that the radiative transition channels, especially for surface-trap-state-related transitions, are also dependent on the surfactants. Specifically, the conduction band electron-intragap state transitions and donor-acceptor transitions were present in all the prepared samples but accounted for different percentages. Furthermore, the surface-trap-state-related transitions significantly faded upon adding (i) OLA/OA as the sole surfactant to the cationic precursor and (ii) the OA + OLA + DPP mixture to the anionic precursor. The findings described here are expected to provide a general strategy for enhancing the tunability of photophysical properties in other QDs systems.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER INTERNATIONAL
·
2024
·
IF 2.9
Qiunan Xie,Xiaohan Li,Jieying Lin,Feiyu Zhu,Jingcheng Liu,Xiaojie Li,Wei Wei
Although epoxy resin (EP) has been widely used in many fields, it is still urgent to effectively improve its flame retardancy by halogen-free strategies. Herein, a silicon-containing cyclotriphosphazene derivative (HEP-Si) was synthesized by nucleophilic substitution and silicon–hydrogen addition reaction using eugenol, hexachlorophosphazene and triethylsilane as raw materials. Then it served as a halogen-free flame retardant for an EP/4,4′-diaminodiphenylmethane system, and its performance was compared with that of commercial flame retardant hexaphenoxycyclotriphosphazene (HPP). The results showed that although the initial thermal decomposition temperature ( T 5% ) of the cured products of EP/HEP-Si was slightly lower than that of pure EP, T 5% did not decrease further as the amount of HEP-Si increased, indicating that good thermal stability was maintained. In addition, the char yield of the cured products of EP/HEP-Si was significantly increased (more than 20 wt%) compared to that of pure EP. The cured EP with the addition of HPP and HEP-Si both achieved a V-0 rating in UL-94 vertical burning test at 0.5 wt% phosphorus content, while the limiting oxygen index of the EP/HEP-Si system was higher, reaching 33.2%. From cone calorimetric test results, the peak heat release rate, total heat release and total smoke production of the cured products of EP/HEP-Si decreased by 61.5%, 37.1% and 26.2%, respectively, compared with that of pure EP. The cured EP/HEP-Si materials also exhibited good thermomechanical and mechanical properties. Therefore, HEP-Si is suggested to be a promising P/N/Si-containing halogen-free flame retardant for EP. © 2024 Society of Industrial Chemistry.
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
Nature Communications
·
2025
·Vol. 16
·期 1
·1-10
·
IF 15.7
Bi Yuhe,Sun Jianhui,Cao Sheng,Li Qiuyan,Zheng Jinju,Yuan Xi,Wang Yunjun,Zou Bingsuo,Zhao Jialong
As next-generation display technologies, eco-friendly colloidal quantum dot light-emitting diodes have drawn great attention due to their excellent luminescence properties, along with their rapid development. However, practical applications of eco-friendly quantum dot light-emitting device remain challenging, primarily due to the inferior performance of green device, which still lag behind their red and blue counterparts. Herein, we present efficient green device based on interfacial potential-graded ZnSeTe quantum dots. Our findings show that this potential-graded structure alleviates interfacial lattice mismatch and strain, reducing structural deformation and misfit defects. The smoothed interfacial potential suppresses the nonradiative recombination processes, particularly Auger recombination revealed by excitation-intensity dependent ultrafast transient absorption kinetics. Consequently, the interfacial potential-graded quantum dots demonstrate highly efficient green quantum dot light-emitting diodes, with a peak external quantum efficiency of 21.7% at 520 nm and a corresponding current efficiency of 75.7 cd A −1 .
研究领域:
材料科学
·
光电子学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）