JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2025
·
IF 3.8
Yao Yang,Shuyong Liang,Jianqiang Bi,Hongli Hou,Linjing Qiao,Shushuai Liu,Tao Wang,Hongyu Gong,Zhao Qian,Jinwang Shi,Weiqiang Li
In general, the grains of ceramic materials tend to grow and coarsen with the prolonging of holding time at high temperatures due to grain boundary migration. In this study, high-entropy diboride ceramics composed of (Hf 0.2 Zr 0.2 Ta 0.2 V 0.2 Nb 0.2 )B 2 were prepared using spark plasma sintering (SPS) at 30 MPa. Notably, grain refinement of the high-entropy diboride ceramics with increased holding times during the SPS process was unexpectedly observed. Specifically, the grain sizes of the (Hf 0.2 Zr 0.2 Ta 0.2 V 0.2 Nb 0.2 )B 2 were refined from approximately 6 µm (synthesized at 1900°C for 5 min) to around 2 µm (synthesized at 1900°C for 10 min). This intriguing phenomenon is likely attributable to the intrinsic lattice distortion observed in high-entropy ceramics. The introduction of VB 2 was found to significantly enhance lattice distortion, playing a crucial role in the grain refinement of the (Hf 0.2 Zr 0.2 Ta 0.2 V 0.2 Nb 0.2 )B 2 . Notably, the grain refinement resulted in significant improvements in flexural strength and fracture toughness. This work offers a novel strategy for tailoring the microstructure and mechanical properties of high-entropy ceramics.
研究领域:
材料科学
·
陶瓷工程
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产品关联
DOI
高影响因子
Small
·
2024
·
IF 13
Boxiang Gao,Weijun Wang,You Meng,Congcong Du,Yunchen Long,Yuxuan Zhang,He Shao,Zhengxun Lai,Wei Wang,Pengshan Xie,SenPo Yip,Xiaoyan Zhong,Johnny C. Ho
As demand for higher integration density and smaller devices grows, silicon-based complementary metal-oxide-semiconductor (CMOS) devices will soon reach their ultimate limits. 2D transition metal dichalcogenides (TMDs) semiconductors, known for excellent electrical performance and stable atomic structure, are seen as promising materials for future integrated circuits. However, controlled and reliable doping of 2D TMDs, a key step for creating homogeneous CMOS logic components, remains a challenge. In this study, a continuous electrical polarity modulation of monolayer WS 2 from intrinsic n-type to ambipolar, then to p-type, and ultimately to a quasi-metallic state is achieved simply by introducing controllable amounts of vanadium (V) atoms into the WS 2 lattice as p-type dopants during chemical vapor deposition (CVD). The achievement of purely p-type field-effect transistors (FETs) is particularly noteworthy based on the 4.7 at% V-doped monolayer WS 2 , demonstrating a remarkable on/off current ratio of 10 5 . Expanding on this triumph, the first initial prototype of ultrathin homogeneous CMOS inverters based on monolayer WS 2 is being constructed. These outcomes validate the feasibility of constructing homogeneous CMOS devices through the atomic doping process of 2D materials, marking a significant milestone for the future development of integrated circuits.
研究领域:
材料科学
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电子工程
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半导体物理
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DOI
高影响因子
CHEMISTRY OF MATERIALS
·
2019
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IF 10.159
Yahui Li,Guopeng Han,Hongwei Yu,Hao Li,Zhihua Yang,Shilie Pan
Two polar molybdenum(VI) iodates(V), NH4[MoO3(IO3)] (1) and KRb[(MoO3)2(IO3)2] (2), have been prepared by a hydrothermal method. They crystallize in noncentrosymmetric (NCS) space groups Pna21 and Cc, respectively. Structurally, it is interesting that compound 2 has an exclusive one-dimensional [IO3]− chain based on corner-sharing [IO4]3– units in all iodates(V). As for the properties, both compounds exhibit large second-harmonic generation responses of 4.7 × KH2PO4 (KDP) for compound 1 and 8.5 × KDP for compound 2 with phase-matching behavior. These results are in good agreement with the results of the theoretical calculations. In addition, both compounds also possess large birefringences (Δn) of 0.083 at 1064 nm and 0.146 at 1064 nm, respectively. These results indicate that the title compounds will have potential applications as nonlinear optical materials.
研究领域:
材料科学
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晶体学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2013
·
IF 3.41
Hua Yang,Qing Wu,Jun Li,Wen Dai,Hengyun Zhang,Dan Lu,Shuang Gao,Wansheng You
A novel catalyst, [Mo 2 V 2 O 9 (bpy) 6 ][PMo 11 VO 40 ], was synthesized by the self-assembling of [PMo 11 VO 40 ] 4− and [Mo 2 V 2 O 9 (bpy) 6 ] 4+ unit and characterized by elemental analyses, TG, IR, X-ray powder diffraction and X-ray single crystal diffraction. [Mo 2 V 2 O 9 (bpy) 6 ][PMo 11 VO 40 ] with multi-isolated active sites showed good catalytic activities for hydroxylation of benzene to phenol . A high yield of phenol (25.5%) with selectivity to phenol of 90.7% was obtained using H 2 O 2 as oxidant. The catalyst can be recycled for 5 times while its structure was unchanged and its catalytic activity was maintained.
研究领域:
化学
·
催化材料科学
✓ 已验证
产品关联
DOI
高影响因子
INORGANICA CHIMICA ACTA
·
2015
·
IF 2.046
Liansheng Cui,Caifeng Bi,Yuhua Fan,Xin Li,Xiangmin Meng,Nan Zhang,Zhongyu Zhang
We have synthesized three novel organobismuth(V) complexes Ph 3 Bi(OOCC 6 H 3 F 2 ) 2 1 , Ph 3 Bi(OOCC 6 H 4 CF 3 ) 2 2 and Ph 3 Bi(OOCC 4 H 3 S) 2 3 , and their structures were characterized by IR spectroscopy, elemental analysis, 1 H NMR and single crystal X-ray diffraction. X-ray crystallography showed that all of the bismuth atoms adopt distorted trigonal–bipyramidal geometries. The complex molecules lead to one-dimensional chain structure and two-dimensional network structure through C–H…X (X = O, F, C) interactions. The interaction of the complex 1 with calf-thymus DNA (CT-DNA) was investigated by UV absorption spectroscopy, fluorescence emission spectroscopy and viscosity. All results revealed that the complex 1 binds to DNA via a intercalative mode. Furthermore the proliferation inhibitory activities of the three complexes on MDA-MB-231 breast cancer cells were investigated. The results indicated that all of the three complexes have superior inhibition of cellular proliferation.
研究领域:
化学
·
分子生物学
·
药理学
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2024
·Vol. 25
·期 8
·4493
·
IF 4.9
Jiuge Tang,Dongmei Fang,Jialing Zhong,Min Li
Canonical autophagy is an evolutionarily conserved process that forms double-membrane structures and mediates the degradation of long-lived proteins (LLPs). Noncanonical autophagy (NCA) is an important alternative pathway involving the formation of microtubule-associated protein 1 light chain 3 (LC3)-positive structures that are independent of partial core autophagy proteins. NCA has been defined by the conjugation of ATG8s to single membranes (CASM). During canonical autophagy and NCA/CASM, LC3 undergoes a lipidation modification, and ATG16L1 is a crucial protein in this process. Previous studies have reported that the WDR domain of ATG16L1 is not necessary for canonical autophagy. However, our study found that WDR domain deficiency significantly impaired LLP degradation in basal conditions and slowed down LC3-II accumulation in canonical autophagy. We further demonstrated that the observed effect was due to a reduced interaction between ATG16L1 and FIP200/WIPI2, without affecting lysosome function or fusion. Furthermore, we also found that the WDR domain of ATG16L1 is crucial for chemical-induced NCA/CASM. The results showed that removing the WDR domain or introducing the K490A mutation in ATG16L1 significantly inhibited the NCA/CASM, which interrupted the V-ATPase-ATG16L1 axis. In conclusion, this study highlights the significance of the WDR domain of ATG16L1 for both canonical autophagy and NCA functions, improving our understanding of its role in autophagy.
研究领域:
细胞生物学
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分子生物学
·
自噬
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2016
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IF 2.567
Chao Ma,Bin Yu,Ningning Hong,Yang Pan,Weizhao Hu,Yuan Hu
A novel branched poly(phosphonamidate-phosphonate) (BPPAPO) oligomer was synthesized from the polycondensation of phenylphosphonic dichloride and trihydroxymethylphosphine oxide followed by end-capping with aniline in a one-pot synthesis. BPPAPO exhibited excellent flame-retardant efficiency in epoxy resins (EP). With only 5.0 wt % loading, the EP composite reached UL-94 V-0 rating with a limiting oxygen index (LOI) value of 35.5%. BPPAPO catalyzed the early degradation of EP and promoted the formation of more char residue. Glass transition temperatures were partially lowered. When 7.5 wt % BPPAPO was incorporated, the peak heat release rate and total heat release were decreased by 66.2% and 37.3%, respectively, with a delayed ignition and the formation of a highly intumescent char residue. Combination of gas-phase and condensed-phase flame-retardant mechanisms was verified.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
INTEGRATED FERROELECTRICS
·
2016
·
IF 0.375
Ling-Hui Nie,Fang-Hui Bai,Ming-Fei Liu,Jing Ning,Bao-Tian Chen,Zhi-Yong Wu
We synthesized Ni0.5Zn0.5Fe2O4 magnetic nanoparticles (MNPs) by co-precipitation method and performed its adsorption of bovine serum albumin V(BSA (V)). The Ni0.5Zn0.5Fe2O4 MNPs in nitrogen atmosphere annealed at 400, 500, 600, 700 and 800°C, respectively. X-ray diffraction (XRD), transmission electron microscopy (TEM) and vibrating sample magnetometer(VSM) were used to characterize the resulting powders of the structure and properties. XRD results show that the Ni0.5Zn0.5Fe2O4 powder is a typical single-phase cubic spinel structure, and has no impurity phases. TEM results show that the Ni0.5Zn0.5Fe2O4 crystalline size is approximately 30–50 nm, which is similar with the XRD estimate results. The magnetic measurements show that Ni0.5Zn0.5Fe2O4 samples, super paramagnetic material, have high saturation magnetization and small coercivity properties. Moreover, We adopted ultraviolet spectrophotometer to analysis adsorption of BSA(V) on the Ni0.5Zn0.5Fe2O4 MNPs at room temperature, which show that annealed temperatures, pH, and stirring time can affect BSA(V) adsorption on the Ni0.5Zn0.5Fe2O4 MNPs. Most importantly, when ultrasonic stirring 2 hours in the liquor BSA(V) at pH = 7.0, the Ni0.5Zn0.5Fe2O4 samples annealed at 600°C has a highest value of 39.81mgg−1. From above these results, Ni0.5Zn0.5Fe2O4 MNPs reveals a great adsorbing ability for BSA(V) that probable are a potential BSA-carrier candidate.
研究领域:
材料科学
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生物医学工程
·
纳米医学
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Yin Li,Jiahui Hu,Yubin Zou,Lin Lin,Hebin Liang,Huaxin Lei,Bing Li,Xiao-yan Li
High-valent iron–oxo species (Fe V =O) generated through peroxide activation by Fe-based catalysts can realize the selective and efficient degradation of organic pollutants in water treatment. However, the rapid and efficient generation of Fe V =O for the selective degradation of pollutants over a wide pH range with high stability is challenging. In this study, a N, P, and S co-doped Fe-single atom (SA) catalyst (Fe SA -NPS@C) with FeN 4 active center was synthesized as a highly efficient catalyst for the peroxymonosulfate (PMS)-based oxidation. The Fe SA -NPS@C catalyst exhibited an excellent catalytic performance at low dosages of both the catalyst and PMS for the degradation of pollutants over a wide pH range with high stability. For the degradation of ofloxacin (OFX), the rate constant pertaining to PMS with Fe SA -NPS@C was 1.68 min −1 , considerably higher than those obtained using the N -doped and N and P co-doped Fe-SA catalysts. The degradation pathway of OFX revealed that the electrostatic effect was of significance in its degradation by Fe V N 4 =O with Fe V N 4 =O being the dominant reactive species. Density functional theory calculations revealed that the heteroatom doping effectively altered the electronic structure of the FeN 4 site of Fe SA -NPS@C, which strengthen its coordination with PMS, promote the electron transfer to PMS, and facilitate the interaction between Fe V N 4 = O and OFX, and thus significantly enhanced its catalytic activity. These findings provide new insights into the oxidation mechanism of Fe V =O in heterogeneous systems and the catalytic ability enhancement through heteroatom doping.
研究领域:
环境科学
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催化化学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2023
·
IF 22.1
Yunshuyu Sun,Hao Li,Yao Hu,Jinnan Wang,Aimin Li,Philippe François-Xavier Corvini
In the present work, NiFe layered double hydroxide (LDH) supported single Ru atoms in-situ growth on BiVO 4 photoanode (BiVO 4 @NiFe-LDHs/Ru) was fabricated to enhance the photoelectrochemical (PEC) water splitting. Ru atoms anchored to NiFe-LDHs via oxygen coordination to form Ru-O-M bonds, which induced electrons rearrangement to improve charge carriers separation and injection. Combining with the synergistic effect of Ru and NiFe-LDHs, BiVO 4 @NiFe-LDHs/Ru achieves high photocurrent density of 4.65 mA/cm 2 at 1.23 V vs. RHE. Besides, Ru atoms induced formation of V (5−x)+ to stabilize V atoms in the lattice of BiVO 4 , which avoided V 5+ dissolution during PEC water oxidation process. Density functional theory (DFT) calculation indicates that Ru SAs anchored to BiVO 4 @NiFe-LDHs decrease the reaction energy barrier of rate-limiting step (*O → *OOH), resulting in acceleration of OER process. This work provides an effective pathway to design high efficient and stable photoanodes with single atoms for feasible PEC water splitting application.
研究领域:
材料科学
·
能源科学
·
催化科学
✓ 已验证
产品关联
DOI
高影响因子
Small
·
2025
·Vol. 21
·期 32
·2503471
·
IF 12.1
Rui Du,Changcheng Liu,Que Huang,Shengnan He,Chao Zheng,Li Guo,Yanjun Chen
For Na 3 V 2 (PO 4 ) 3 (NVP) cathode, the activity and utilization rate of Na and V is the key to affecting its electrochemical properties. However, few studies can simultaneously optimize both. Currently, a facile hydrothermal route is proposed to successfully synthesize the honeycomb-like porous NVP@CHSLS cathodes possessing anchoring effects to enhance the immobilization of active Na/V through in situ carbonation with chitosan and sodium lignosulfonate. DFT calculations demonstrate the N/S co-doped carbon skeleton gains more electrons and behaves with superior charge transfer capability. Accordingly, XAFS verifies the existence of hypervalent V 4+ for the charge balance, as well as a newly generated C-N-V bond inside the bulk, which significantly inhibits the dissolution of V in the electrolyte. Moreover, ex-situ and after-cycled XRD verifies beneficial electrochemical intermediums such as Na 2 S manifest extra sodium fixation characteristics, which not only enter into the CEI membrane to reduce the loss of Na + , but also participate in the de-intercalation of Na + . Furthermore, honeycomb-like porous morphology enriches the active sites for Na + migration and improves the wettability of electrolytes, demonstrated by contact Angle and AFM tests. Consequently, the optimized NVP@CHSLS-2 reveals a high postactivated capacity of 104.5 mAh g −1 at 60 C, and it remains at 98.8% after 10 000 cycles at 60 C.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2018
·
IF 3.468
Siyu Xia,Zhiyong Zhang,Yang Leng,Bin Li,Miaojun Xu
A novel polymeric mono-component intumescent flame retardant poly(piperazine methylphosphonic acid neopentylglycol ester) (PPMPNG) was synthesized from methylphosphonic acid, piperazine and neopentyl glycol. Its chemical structure was detailed characterized by Fourier transform infrared spectroscopy (FTIR), 13 C and 31 P solid-state nuclear magnetic resonance. PPMPNG was incorporated into polyethylene (PE) and the flame retardancy, thermal properties and flame retardant mechanism of materials were investigated. The samples with the thickness of 1.6 mm passed UL-94 V-0 rating during vertical burning tests and the limiting oxygen index was 25.6% when 23 wt% PPMPNG was introduced. The results of thermogravimetric analysis (TGA) showed that the addition of PPMPNG promoted the degradation and carbonization of materials at the beginning and improved the char residue amount and thermal stability of FR-PE at high temperature. Cone calorimeter tests indicated that the peak value of heat release rate was considerably reduced with the incorporation of PPMPNG. The flame retardant mechanism showed PPMPNG exerted isolation effect in condensed phased and quenched active free radical effect in gas phase. The combustion intensity was reduced and the flame was suppressed and even extinguished, thus a high efficiency for PE matrix was achieved.
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
危险品化学品经营许可证（带存储）