JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 12
·7494-7507
·
IF 4.22
Zhang Rui,Yuan Yaoxin,Zhang Jianfeng,Liu Haiyun,Chen Gang,Li Kun,Hong MengQing,Zuo Wenbin,Wang Chunlan,Yang Wen,Qin Zhenxing
Mn-doped perovskite CsPb(Cl/Br) 3 nanocrystals (NCs) have been widely explored due to their unique dual-color emission characteristics, which could reduce the usage of toxic Pb and introduce the exciton emission in blue region and the stable Mn 2+ emission peak in orange-red region via energy transfer from exciton to Mn 2+ emission. Although doping high concentration Mn 2+ could increase the Mn 2+ emission, excess Mn 2+ ions would be expelled from the host perovskite lattice. Doping secondary metal Ni into the NCs as an efficient method is always used to improve the Mn 2+ emission. We adopted a one-pot halogen injection into Cs-precursor under ambient environment method to prepare (Mn, Ni): CsPbCl 3 and (Mn, Ni): CsPb(Cl/Br) 3 NCs, which introduces NiCl 2 in the Mn: CsPb(Cl/Br) 3 NCs to supply enough halide ions and to passivate defect states or traps in the perovskite NCs so as to enhance Mn 2+ emission. Density Functional Theory (DFT) calculations were also conducted to explain our experimental results, which revealed that Ni 2+ doping could eliminate the in-gap deep defects of the CsPb(Cl/Br) 3 nanocrystals. In addition, the passivated lattice defects help to improve the stability of the perovskite NCs, preventing from electron beam irradiation.
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高影响因子
ECS Journal of Solid State Science and Technology
·
2020
·Vol. 9
·期 3
·036003
·
IF 2.142
Xiaoyu Zhang,Peiyuan Cao,Bobo Yang,Yunlong Gao,Xun Hong,Yu Ming,Fei Zheng,Yaoqing Chu,Jun Zou
Embedding cesium lead bromide perovskite quantum dots (PQDs) into silica matrix has been proved as an efficient way to enhance the stability of PQDs. Here, we firstly report 3-(Dimethoxymethylsilyl)propylamine (DEMSPA) as a precursor to form coating shell. The PQDs solution and DEMSPA were mixed in the open air at the room temperature. The final product was extracted from the sol-gel solution. The luminescent properties of QDs is over 60 d of storage under ambient conditions. The PQDs/SiO2 composite powder possesses the photoluminescence quantum yield (PLQY) of 63.5%. Coating the powder on the blue chips, the white light-emitting diode (LED) exhibits a wide color gamut with 123.6% of National Television System Committee (NTSC) color triangle area. The PQDs/SiO2 composite has been proved cubic phase structure, indicating good crystallinity. The good crystallinity enables QDs to be applied as broad optoelectronic devices.
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International Journal of Biological Sciences
·
2024
·Vol. 20
·期 8
·2904-2921
·
IF 8.2
Xiong Tianxin,Li Yi,Yang Molin,Huo Bo,Guo Xian,Liu Liyuan,Huang Yanxin,Zhu Xuehai,Hu Qinghua,Wei Xiang,Jiang Ding-Sheng,Yi Xin
Abnormal proliferation of pulmonary artery smooth muscle cells (PASMCs) is one of the critical pathological mechanisms of pulmonary hypertension (PH), and therefore is gradually being adopted as an important direction for the treatment of PH. Metallothioneins (MTs) have been reported to be associated with PH, but the underlying mechanisms are not fully understood. Here, we demonstrated that the expression level of metallothionein 3 (MT3) was significantly increased in pulmonary arterioles from PH patients and chronic hypoxia-induced rat and mouse PH models, as well as in hypoxia-treated human PASMCs. Knockdown of MT3 significantly inhibited the proliferation of human PASMCs by arresting the cell cycle in the G1 phase, while overexpression of MT3 had the opposite effect. Mechanistically, we found that MT3 increased the intracellular zinc (Zn2+) concentration to enhance the transcriptional activity of metal-regulated transcription factor 1 (MTF1), which promoted the expression of autophagy-related gene 5 (ATG5), facilitating autophagosome formation. More importantly, MT3-induced autophagy and proliferation of human PASMCs were largely prevented by knockdown of MTF1 and ATG5. Therefore, in this study, we identified MT3-Zinc-MTF1-ATG5 as a novel pathway that affects PASMC proliferation by regulating autophagosome formation, suggesting that MT3 may be a novel target for the treatment of PH.
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Marine Drugs
·
2024
·Vol. 22
·期 6
·250
·
IF 4.9
Wanting Hao,Leyan Wang,Tongqiang Xu,Geng Jia,Yuqi Jiang,Chong Qin,Xiaoyang Li
Acute myeloid leukemia (AML) is a hematologic malignancy characterized by infiltration of the blood and bone marrow, exhibiting a low remission rate and high recurrence rate. Current research has demonstrated that class I HDAC inhibitors can downregulate anti-apoptotic proteins, leading to apoptosis of AML cells. In the present investigation, we conducted structural modifications of marine cytotoxin Santacruzamate A (SCA), a compound known for its inhibitory activity towards HDACs, resulting in the development of a novel series of potent class I HDACs hydrazide inhibitors. Representative hydrazide-based compound25cexhibited concentration-dependent induction of apoptosis in AML cells as a single agent. Moreover,25cexhibited a synergistic anti-AML effect when combined with Venetoclax, a clinical Bcl-2 inhibitor employed in AML therapy. This combination resulted in a more pronounced downregulation of anti-apoptotic proteins Mcl-1 and Bcl-xL, along with a significant upregulation of the pro-apoptotic protein cleaved-caspase3 and the DNA double-strand break biomarker γ-H2AX compared to monotherapy. These results highlighted the potential of25cas a promising lead compound for AML treatment, particularly when used in combination with Venetoclax.
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COMPOSITES PART B-ENGINEERING
·
2022
·
IF 11.322
Feichong Yao,Wenhao Xie,Chao Ma,Dedong Wang,Zeinhom M. El-Bahy,Mohamed H. Helal,Hu Liu,Ai Du,Zhanhu Guo,Hongbo Gu
The polymer nanocomposites with 3-dimensional (3D) nanofillers can form a 3D network and attain a uniform distribution of nanofillers, which benefits the transfer of charge carriers and phonons as well as the dispersion of stress at a very low loading of nanofillers. These polymer nanocomposites with high mechanical properties would have great potential for thermal and electrical conduction as well as electromagnetic interference (EMI) shielding. In this paper, the 3D epoxy nanocomposites are manufactured by stuffing epoxy resin into 3D p -phenylenediamine-aniline copolymer nanofibers@Cu foam (P-PANI@f-Cu) hybrid nanofillers that are constructed by electrophoretic deposition of phosphoric acid doped P-PANI copolymer nanofibers onto the surface of sodium hydroxide oxidized Cu foam. Benefiting from 3D continuous network of P-PANI@f-Cu hybrid nanofillers, the electrical conductivity and thermal conductivity of 3D P-PANI@f-Cu/epoxy nanocomposites with the P-PANI loading of 0.262 wt% could achieve 7.71 ± 0.04 S cm −1 and 5.4670 ± 0.0085 W m −1 K −1 , respectively, which are much better than that of pure epoxy (insulator and 0.2310 ± 0.0017 W m −1 K −1 , respectively) and epoxy composites filled with only Cu foam (4.46 ± 0.03 S cm −1 and 2.7907 ± 0.0057 W m −1 K −1 , respectively). Meanwhile, with a thickness of 1.8 mm, the average total EMI shielding effectiveness (SE T ) of 3D P-PANI@f-Cu/epoxy nanocomposites in the X-band range reaches a high value of 66.14 dB, which is capable of effectively shielding the electromagnetic signal between Bluetooth earphone and smartphone in the practical application. Furthermore, the 3D P-PANI@f-Cu hybrid nanofillers can efficiently prevent the crack growth in the epoxy nanocomposites and improve their mechanical properties including hardness and elastic modulus .
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高影响因子
INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Shuai Huang,Mengmeng Shang,Yu Yan,Peipei Dang,Jun Lin
Co-doping mixed-valence Eu2+/3+ in a single-phase phosphor is an efficient method to realize the emission color regulation, which holds great potential for anticounterfeiting and ratiometric temperature sensing. Here, the mixed-valence Eu-doped Sr1.95+xLi1–xSi1–xAlxO4F (0 ≤ x ≤ 0.25) phosphors were designed and prepared under a reducing atmosphere. The correlation of local phase structures and luminescence properties was discussed. Replacing Si4+–Li+ ion pairs with Al3+–Sr2+ ion pairs compresses the Sr sites occupied by Eu2+, and it stabilizes Eu3+ in a reducing atmosphere and leads to the coexistence of Eu2+ and Eu3+ in single-phase Sr1.95+xLi1–xSi1–xAlxO4F:0.05Eu (0 ≤ x ≤ 0.25) phosphors. Based on the wavelength-dependent luminescence color behaviors of Sr1.95+xLi1–xSi1–xAlxO4F:0.05Eu phosphors, the fluorescent anticounterfeit papers/patterns containing Sr1.95+xLi1–xSi1–xAlxO4F:0.05Eu phosphors were the same as ordinary paper under ambient conditions. However, the hidden colors or images can be read out with green-orange luminescence under 365/300 nm light excitation. Benefiting from the diverse thermal response emission behaviors of Eu2+ (530 nm) and Eu3+ (703 nm), Sr1.95+xLi1–xSi1–xAlxO4F:0.05Eu phosphors exhibit temperature sensing performances, with the maximum absolute and relative sensitivity being 0.0294 K–1 at 573 K and 0.83% K–1 at 348 K. More importantly, Sr1.95+xLi1–xSi1–xAlxO4F:0.05Eu phosphors showed excellent stability in humid, acid, and alkali environments, which contributed to applying mixed-valence Eu2+/3+-doped Sr1.95+xLi1–xSi1–xAlxO4F to the fields of multicolor anticounterfeiting and noncontact optical thermometry.
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RSC Advances
·
2020
·Vol. 10
·期 55
·33080-33085
·
IF 3.119
Yue Hu,Yuxin Zhang,Chaoqun Yang,Ji Li,Li Wang
All inorganic perovskite nanocrystals (NCs) have wide practical applications for their remarkable optoelectronic properties. To obtain blue-emitting perovskites with high photoluminescence quantum yield and room-temperature ferromagnetism, CsPb1−xFex(Br1−yCly)3 NCs were synthesized using a hot injection method. The effects of the cation–anion co-exchange on the structural, luminescent and magnetic properties of CsPbBr3 NCs were studied by X-ray diffraction spectroscopy, photoluminescence spectroscopy, transmission electron microscopy, field emission scanning electron microscopy, and vibrating sample magnetometer. The results indicated that there was cation–anion co-exchange in CsPb1−xFex(Br1−yCly)3 NCs, while the band-edge energies and PLQY were mainly affected by the anion exchange. The ferromagnetism of CsPb1−xFex(Br1−yCly)3 NCs had been observed at room temperature, and there was an increase in saturation magnetization with increasing Fe concentration.
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高影响因子
DALTON TRANSACTIONS
·
2022
·Vol. 51
·期 18
·7333-7342
·
IF 4.569
Hua Yu,Liuyan Zhou,Renguang Ye,Degang Deng,Shiqing Xu
Polychromatic emission can be achieved by controlling the distribution of the rare earth activator in multi-cation lattices, which can be used in the fields of white light LED and fluorescence temperature sensing. However, it is still a challenge to control their distribution and location of the target site in a given host material because the distribution of the rare earth activator is uncertain. In this paper, we have chosen Li4SrCa(SiO4)2 as the multi-cation site host and induced the distribution of Eu2+ ions between different cation sites through anion substitution, for the first time, to regulate the luminescence characteristics of a series of Li4SrCaSi2O8−yN2y/3:Eu2+ phosphors. In Li4SrCa(SiO4)2:Eu2+ phosphors, the substitution of O2− by N3− triggered a distinct ordered to disordered structure transition of the SiO4 tetrahedron and induced the remote distribution of the Eu2+ activator, which was verified through the analysis of the XRD, EPR, FT-IR and fluorescence spectra. Due to the location of Eu2+ ions in different cation sites (Eu2+Sr and Eu2+Ca), two distinguishable emission peaks with tunable color emissions and different responses to temperature were realized. The white LED that utilized blue-orange-emitting Li4SrCaSi2O4N8/3:Eu2+ and green-emitting BaSi2O2N2:Eu2+ (500 nm) displayed an outstanding color rendering index (Ra) of 85.1. Based on the fluorescence intensity ratio (FIR) technique, an optical temperature measurement mechanism was hypothesized and studied in the temperature range of 293–473 K. The highest Sa of the material was 0.086 K−1, and Sr was 1.76% K−1 based on the FIR detection technology, revealing obviously better than most inorganic optical temperature-measuring materials reported before. Our work indicates that Li4SrCaSi2O8−2yN4y/3:Eu2+ is a promising material for application in White LEDs and optical thermometers.
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Journal of Materials Chemistry C
·
2021
·Vol. 9
·期 10
·3672-3681
·
IF 7.393
Sheng Wu,Puxian Xiong,Xiaoqi Liu,Yubin Fu,Quan Liu,Yang Chao,Quan Dong,Yuanyuan Li,Weiwei Chen,Yan Chen,Zhijun Ma,Mingying Peng
In this study, a blue fluorescent material Sr3Y(BO3)3:Bi3+ was synthesized by the high temperature solid-state reaction method. The corresponding structural characteristics, concentration and temperature dependent luminescence characteristics of Sr3Y(BO3)3:Bi3+ and the LED device performances were systematically studied. At different excitation wavelengths in the range of 340–375 nm, the photoluminescence (PL) region can be adjusted from green (CIE: (0.2524, 0.4063); Peak: 511 nm) to blue (CIE: (0.1936, 0.1236); Peak: 415 nm). The best excitation peaked at ∼370 nm, which well matches with the emission of a commercial near-ultraviolet (NUV) light-emitting diode (LED) chip. The thermal quenching experiment was performed, and the activation energy was calculated as 0.23 eV. At high temperature, the Sr2.55Y(BO3)3:0.45Bi3+ phosphor presented good thermal stability (79.99% of RT emission intensity at 420 K). LED devices (chip: 370 nm) using the Sr2.55Y(BO3)3:0.45Bi3+ phosphor as a fluorescent material showed excellent electroluminescence performance. Under a driving current of 20 mA, the devices showed CIE coordinates of (0.3842, 0.3980), a correlated color temperature (CCT) of 4053 K and a high color rendering index (Ra) of 91.6. This work demonstrates that Sr3Y(BO3)3:Bi3+ is a promising NUV excited blue fluorescent material which shows advantage in white light-emitting diodes for solid-state lighting.
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高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2013
·
IF 4.093
Wen-hao Luo,Lian-hua Zhao
New silicon source (3-glycidyloxypropyltrimethoxysilane (GPTMS)) was used to make non-glass inorganic–organic hybrid membranes with diethylethylammonium trifluoromethanesulfonate ([dema][TfO]) by the sol–gel method. The hybrid membranes were studied with respect to their structural, thermal, proton conductivity and pores properties. The Fourier transform infrared spectroscopy (FT-IR) results showed that there was intermolecular interaction between ionic liquid and Si–O–Si skeleton structure in the inorganic–organic hybrid membranes. The thermogravimetric (TG) and differential scanning calorimetry (DSC) analysis showed that the hybrid membranes displayed good chemical stability and were thermally stable up to more than 200 °C in air. The N 2 adsorption test showed the hybrid membranes had good pore property and ionic liquid influenced the structure of hybrid membrane. Proton conductivity was measured from 20 °C to 220 °C and high conductivity of 1.2×10 −2 S/cm was obtained for a 60 wt% [dema][TfO] doped hybrid membrane (ionogel) at 220 °C under anhydrous conditions. This method for the preparation of hybrid membranes is promising and may be used for the proton exchange membrane in fuel cells.
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CARBOHYDRATE POLYMERS
·
2010
·Vol. 83
·期 4
·1631-1635
·
IF 3.167
Kun Huang,Jianling Xia,Mei Li,Jianwei Lian,Xiaohua Yang,Guifu Lin
Cellulose stearates with different degrees of substitution (DS) were prepared homogeneously in ionic liquid 1-butyl-3-methylimidazolium chloride ([C 4 mim] + Cl − ) solution. Cellulose stearates with DS values of 2.15, 2.19 and 2.57 exhibited good solubility in nonpolar organic solvents . It was indicated by differential scanning calorimetry (DSC) that the melting temperatures of the three cellulose stearates ranged from 38.66 to 56.63 °C. Thermogravimetric (TG) analysis showed that the commencing degradation temperature of the three cellulose stearates were 300 °C, 325 °C and 370 °C, respectively. The cellulose stearate with the DS value of 2.57 has better thermal stability than cellulose.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Meng Ge,Yuanye Zhuang,Shiyang Bai,Jingjing Sun,Yingying Cheng,Xufeng Gong,Jihong Sun,Yanmin Yu
Metal-organic frameworks (MOFs) exhibit excellent structural properties, but their application in catalysis is limited due to their saturated coordination structures. Herein, catalysts containing unsaturated coordination MOF structural units loaded onto 3-aminophenol-formaldehyde resin (APF) were prepared using a stepwise assembly method. The amino groups in APF serve as anchoring groups, enabling the optimal dispersion of zinc on the surface of the carrier. The coordination saturation and the dominant surface groups can be controlled by the stepwise assembly. SEM, FT-IR, UV spectroscopy, XPS, zeta potential, and SAXS were employed to demonstrate the stepwise assembly process. The characterization results revealed that the binding strength between zinc and ligands on the APF spheres, as well as the coordination saturation state of zinc, progressively increased during the stepwise assembly process. Additionally, comprehensive evaluation of the catalytic performance was conducted via the cycloaddition reaction of CO₂ with epoxides to elucidate the feasibility and superiority of the synergistic catalysis between metal ions and functional ligands in the dual-active-center catalyst. The hybrid catalyst Zn-BDC/A-1 with the highest surface roughness but lowest Zn coordination exhibited the most efficient catalytic performance. Furthermore, the density functional theory (DFT) calculations substantiated that zinc centers on the APF surface exhibit a preferential coordination geometry involving no more than two ligand groups, and a ligand-dominated chemical environment. These findings demonstrate that the stepwise assembly maintains the coordinative unsaturation of metal centers and also optimizes the spatial availability of ligand functionalities.
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