查找使用阿拉丁产品的科研文献

Multi-site occupancies of Dy3+ in Ca3Gd(AlO)3(BO3)4 and their optical thermometric applications

Ye Zhiqi,Cheng Zhiyuan,Liu Tong,Shi Tian,Gao Fuhao,Khan Wasim Ullah,Zhang Yueli

Lanthanide-doped Ca 3 Ln(AlO) 3 (BO 3 ) 4 phosphors are adopted for numerous new types of applications with outstanding optical properties. Herein, the novel Ca 3 Gd(AlO) 3 (BO 3 ) 4 :Dy 3+ phosphors were synthesized by the high-temperature solid-state method. X-ray diffraction, scanning electron microscopy, transmission electron microscopy, diffuse reflection spectroscopy, and as well as photoluminescence (PL) spectra and lifetime curves are used to exemplify the resulting samples. This research explores the samples microstructure and the influence of Dy 3+ doping at the Ca and Gd sites. The PL spectrum results indicated that Ca 3 Gd(AlO) 3 (BO 3 ) 4 :Dy 3+ can be effectively excited by 349 nm UV light and emits bright white light results of Dy 3+ ions with the 4f–4f transition. The optimum doping content of the Dy 3+ in the Ca 3 Gd(AlO) 3 (BO 3 ) 4 host samples were 7 mol%, and the concentration quenching (CQ) mechanism was mainly owing to dipole–dipole interaction. Interestingly, the Ca 3 Gd 0.93 (AlO) 3 (BO 3 ) 4 :0.07Dy 3+ showed exceptional thermal-quenching resistance of > 87.3% intensity at 350 K. The temperature-sensing properties of Ca 3 Gd 0.93 (AlO) 3 (BO 3 ) 4 :0.07Dy 3+ ranging from 300 to 500 K were analyzed and had shown a decent maximum S A value about 1.35% K −1 at 500 K between 455 and 669 nm fluorescence intensity ratio. Hence, the novel Ca 3 Gd 0.93 (AlO) 3 (BO 3 ) 4 :0.07Dy 3+ materials could be a competent candidate for low-cost and non-contact optical thermometry in a high-temperature environment.

Synthesis, Structure and Properties of Three New Polymers Based on 5-(Pyridin-3-yl)isophthalic Acid

Wu Kai-Fei,Jiang Fen,Xiao Han,Bai Xian-Li,Mo Shao-Yin,Feng Yu

Three new metal–organic complexes [Fe(pyip)(H 2 O) 2 ] n ( 1 ), [Co(pyip)(H 2 O) 2 ] n ( 2 ) and [Ni(pyip)(H 2 O) 2 ] n ( 3 ) have been synthesized and characterized based on the carboxylic acid with N donor ligand (H 2 pyip=5-(Pyridin-3-yl)isophthalic acid). X-ray structure analysis reveals that complexes 1 – 3 showed identical 3-D supramolecular architecture that adopt different metal center. They all crystallize in hexagonal space group P 6(5) and exhibited exclusive coordination mode. One of the H 2 pyip adopt bidentate chelate coordination mode and the other coordination carboxylate oxygen atom adopts the single dentate bridging mode. Moreover, the two novel complexes were characterized by IR spectrum, elemental analysis, fluorescent properties, thermogravimetric analysis and powder X-ray diffraction.

Efficient and Tunable Near-Infrared Luminescence in Cubic Phosphate K2AlTi(PO4)3:Cr3+ for Spectroscopy Applications

Long Chen,Jiyou Zhong

Broadband near-infrared (NIR) phosphors are crucial components of NIR phosphor-converted light-emitting diode (pc-LED) sources for various smart spectroscopy applications. However, developing an efficient, tunable, and inexpensive broadband NIR phosphor with sufficient spectral coverage remains a great challenge. In this work, a cubic phosphate K2AlTi(PO4)3 with highly structural rigidity was chosen as host material for Cr3+ substitution to create an efficient NIR emission. Synthesizing this compound, the obtained material exhibits a broadband NIR emission covering 700–1200 nm with a peak wavelength ranging from 820 to 860 nm depending on the Cr3+ substituting concentration. The Cr3+ concentration optimized sample possesses a photoluminescence quantum yield (PLQY) of 76.4% with an emission peak centered at 857 nm and a full width at half-maximum (fwhm) of 184 nm under 464 nm exaction, demonstrating an efficient and relatively long-wavelength NIR emission with wide spectral coverage. This broadband NIR emission is mainly derived from a single kind of emission center deduced from spectral analysis, luminescence dynamics, and first-principle calculations. Using this material, the fabricated NIR pc-LED device presents an excellent NIR output power and NIR photoelectric conversion efficiency, making this material attractive in practical applications of night-vision and bioimaging. Therefore, this work not only provides a broadband NIR material with superiorities of low cost, high efficiency, wide-range tunability, wide spectral coverage, and relatively long-wavelength NIR emission for spectroscopy applications but also highlights some clues to discover this kind of materials.

Thermal behavior of Al(NO3)3·9H2O and its application in preparing Al2O3 and regenerating HNO3

Shuyang Shi,Baozhong Ma,Ding Zhao,Xiang Li,Shuang Shao,Chengyan Wang,Yongqiang Chen

The new process ‘coal gangue/fly ash – HNO 3 pressure leaching (NAPL) –low-temperature pyrolysis’ was proposed by our team, which aimed to achieve the transformation of coal-based solid wastes from harmless to Al resource. For cost control, the regeneration of HNO 3 at a low cost was crucial for the process. Following NAPL of coal gangue and fly ash, massive amounts of Al(NO 3 ) 3 ·9 H 2 O were collected, with a decomposition temperature as low as 523 K. The energy consumption for low-temperature pyrolysis could be supplied by the combustion of residual carbon (6.96 wt%) during the thermal activity of coal gangue, allowing HNO 3 to be regenerated and recycled without extra heat supply . However, little research has been done on the pyrolysis behavior and kinetics of Al(NO 3 ) 3 ·9 H 2 O, which was examined in this study. The pyrolysis characteristics of Al(NO 3 ) 3 ·9 H 2 O were assessed by TG-DSC analysis. Further experiments and XRD/FTIR/MS analysis revealed that phase evolution of Al(NO 3 ) 3 ·9 H 2 O followed the sequence of Al(NO 3 ) 3 ·9 H 2 O→ Al(NO 3 ) 3 ·nH 2 O→ Al(NO 3 ) 3 ·3Al(OH) 3 ·5/2 H 2 O→ AlOOH→ Al 2 O 3 . Subsequently, the thermodynamic (∆ G , ∆ H , ∆ S ) and kinetic ( E a , A ) parameters were calculated based on the thermogravimetric data by the iso-conversional methods. And the mechanism models and functions were identified via the Malek method. Finally, the economic evaluation of pyrolysis indicated that 5.04 × 10 –3 Nm 3 of natural gas was consumed during pyrolysis of one mole Al(NO 3 ) 3 ·9 H 2 O, equivalent to 44.33 $ per ton of Al 2 O 3 . As a basic research of Al(NO 3 ) 3 ·9 H 2 O pyrolysis, this paper enhances related theories of the NAPL process.

Effects of hydrogen sulfide (H2S) on respiration control of state 3/4 in mitochondria from bovine heart

Y Su,Y Cheng,D Wang,F Zhang,Y Su,Z Li

Microbial-derived 3-phenylpropionic acid orchestrates immune-progenitor cell crosstalk to promote beige adipogenesis and energy expenditure

Defu Li,Bo Xia,Ruoci Hu,Zhao Zhang,Cong Xu,Hanjian Zhou,Xiao Li,Yonglin Hua,Shusong Wu,Ke Zhang,Yuwei Jiang,Jiangwei Wu,Yexian Yuan

Cold exposure induces beige adipogenesis in white adipose tissue, enhancing thermogenesis and energy expenditure. While gut microbiota-derived metabolites influence host metabolism, their role in thermogenic adaptation remains poorly defined. Here, we identify P. copri as a key microbial mediator of cold-induced adipose remodeling. Cold exposure expands P. copri in the colon, which produces 3-phenylpropionic acid (3-PPA), a metabolite that promotes beige adipocyte formation and increases energy expenditure. Mechanistically, 3-PPA signals through free fatty acid receptor 1 in M2-like macrophages, inducing chemokine C-X-C motif chemokine 13 (CXCL13) secretion, which recruits T follicular helper cells to facilitate beige adipogenesis. Lineage-tracing analyses show that adipocyte progenitor cells generate new beige adipocytes in response to 3-PPA. Moreover, 3-PPA supplementation counteracts high-fat diet-induced obesity in mice and promotes thermogenesis in mouse, pig, and human adipose progenitor cells. These findings define a microbiota-immune-adipose progenitor axis regulating cold adaptation and highlight microbial metabolites as potential metabolic therapies.

Synthesis of 4,6-diphenyl-3-cyanopyridine derivatives based on 3D-QSAR: unveiling their potential as survivin inhibitors

Lu JiaHao,Zhao ChenHao,Qiu YingQI,Shen Li-Qun,Zhu Hua,Zhang Miao

Survivin, a multifunctional regulator of mitosis and apoptosis, plays a central role in cancer progression and therapy resistance, making it an attractive target for anticancer drug development. In this study, a series of 4,6-diphenyl-3-cyanopyridine derivatives were designed and synthesized as potential survivin inhibitors through an integrated strategy combining 3D-QSAR modeling, molecular docking, molecular dynamics simulations, and biological evaluation. The CoMFA and CoMSIA models established reliable structure–activity relationships and provided contour-map-based guidance for rational molecular optimization. Newly designed derivatives displayed enhanced antiproliferative effects against melanoma cells, and computational analyses revealed that the most promising compound showed stable and preferential binding within the BIR domain of survivin, particularly in its dimeric form. These findings demonstrate the effectiveness of contour-guided optimization in discovering novel survivin-targeting scaffolds and highlight 4,6-diphenyl-3-cyanopyridine derivatives as promising leads for further anticancer drug development. Future studies will focus on improving selectivity, clarifying the inhibition mechanism at the molecular level, and evaluating in vivo efficacy.

A first newly isolated strain capable of effectively degrading 3-methylpentane: Identification, degradation characteristics and pathway analysis

Qian Li,Yujing Zhao,Liqin Sun,Zhonghui Sun,Raquel Lebrero,Raúl Muñoz,Jianmeng Chen,Rongsheng Lin,Dongzhi Chen

Biotechnology is applicable for the treatment of volatile organic compounds emitted from petrochemical industries. However, the biodegradation of methyl alkanes is limited by low microbial activity and poor mass transfer. Herein, a novel strain capable of effectively utilizing 3-methylpentane (3MP) as the sole carbon source was firstly isolated and identified as Mycobacterium sp. SLQ-1. The strain could function well within wide ranges of pH (5.0-8.0) and temperature (30-45℃), with the maximum specific growth and biodegradation rates being 0.084 and 0.587   h -1 , respectively. The optimum function conditions (pH 6.9, temperature 36.2℃) and 3MP removal efficiencies were predicted via response surface analysis. The repeated recycling of 2-methyl silicone oil enhanced 3MP biodegradation due to microbial adsorption. Two possible 3MP biodegradation pathways were proposed based on the analysis of metabolic intermediates, genes and enzymes. Furthermore, the strain had a wide utilization spectrum toward various alkanes, olefins and aromatics, presenting great engineering application potential.

Salt-free catanionic surface active ionic liquids 1-alkyl-3-methylimidazolium alkylsulfate: Aggregation behavior in aqueous solution

Jingjing Jiao,Bing Han,Meijia Lin,Ni Cheng,Li Yu,Min Liu

A series of salt-free catanionic surface active ionic liquids (SAILs), 1-alkyl-3-methylimidazolim alkyl sulfates (denoted as [C n mim][C m SO 4 ], n   =   6, 8, 10; m   =   12 and n   =   4; m   =   10, 14) were synthesized by an ion exchange reaction and their surface properties in aqueous solution were examined systematically by surface tension, fluorescence and electrical conductivity measurements. As catanionic surfactants, these SAILs exhibit notably higher surface activity, compared to the cationic or anionic analogues. Increment in both cationic and anionic alkyl chain lengths for [C n mim][C m SO 4 ] can both improve the amphiphilic character remarkably. This can be ascribed to cooperative interactions as formation of catanionic pairs between alkyl-substituted imidazolium cations and alkyl sulfate anions. The negative micellization Gibbs free energy values prove that the micellization of all the 1-alkyl-3-methylimidazolim alkyl sulfates investigated is a spontaneous process. Any additional CH 2 group makes the micellization process easier regardless if it is on a cation or an anion. When keeping the total carbon atom number constant, we find that the [C n mim][C m SO 4 ] molecules with greater asymmetric alkyl chains display superior surface activity. This work indicates that the self-assembly of these imidazolium-based salt-free catanionic SAILs can be tailored by adjusting the mismatch of alkyl chains. These SAILs are expected to have potential applications in the fields of colloidal and interface and nanomaterial synthesis.

A new sodium ferrous orthophosphate Na x Fe4(PO4)3 as anode materials for sodium-ion batteries

Zhang Hui,Zhao Yanming,Wen Mingming,Dong Youzhong,Fan Qinghua,Kuang Quan,Liu Huatao,Lian Xin

A new sodium ferrous orthophosphate Na x Fe 4 (PO 4 ) 3 (1.1 ≤  x  ≤ 1.2) with P 2 1 / n symmetry has been successfully synthesized via a solid-state reaction for the first time. The structure consists of FeO 5 pyramids, FeO 6 octahedron, and PO 4 tetrahedra which form large six-sided tunnels along \( \vec{b} \) direction and three- or four-sided tunnels running along \( \vec{a} \) direction. When evaluated as the anode materials for sodium-ion batteries, the first discharge and charge capacities of 553 and 264 mAh g −1 for Na 1.1 Fe 4 (PO 4 ) 3 /C and 583 and 315 mAh g −1 for Na 1.2 Fe 4 (PO 4 ) 3 /C, respectively, can be obtained at 10 mA g −1 current density. Compared to the Na 1.1 Fe 4 (PO 4 ) 3 /C, Na 1.2 Fe 4 (PO 4 ) 3 /C exhibits a better cycling performance, where the charge capacity of about 100 mAh g −1 can still be maintained after 15 cycles. The electrode kinetics are investigated further by the electrochemical impedance spectroscopy.

KBi(IO3)3(OH) and NaBi(IO3)4: from the centrosymmetric chain to a noncentrosymmetric double layer

Ying-Jie Jia,Yi-Gang Chen,Ting Wang,Yao Guo,Xiao-Fang Guan,Xian-Ming Zhang

Two new alkali–metal bismuth iodates KBi(IO3)3(OH) (1) and NaBi(IO3)4 (2) have been synthesized by a hydrothermal method via tuning of alkali–metal ions. Compound 1 crystallizes in the space group P and features a [Bi(IO3)3(OH)]n chain with eight-membered Bi–O–I–O–Bi–O–I–O rings. The [Bi(IO3)3(OH)]n chain consists of paddlewheel-like dimeric Bi2(OH)2(IO3)4 units linked by IO3 pairs. Compound 2 in the polar space group Cc features a [Bi(IO3)4]− double layer with Bi4I4 eight-membered rings (8-MRs). NaBi(IO3)4 exhibits a strong second harmonic generation (SHG) response of ∼5.0 × KDP (KH2PO4) and a wide transmittance window (0.4–12 μm), and structure analyses and theoretical calculations reveal that polarization results mainly from the proper alignment of the IO3 groups. The calculated electronic structure based on the DFT method indicates that the BiOn and IO3 groups dominate their optical properties.

The influence of 3-methacryloxypropyltrimethoxysilane on thermostability, tensile behavior and water resistance of polyvinyl acetate/clay nanocomposite

Zhang Qi,Hao Ning,Zhang Qi,Liu Zhiyong

A novel clay-silane coupling agent-polymer hybrid material based on polyvinyl acetate (PVAc)–organophilic montmorillonite (OMMT) and 3-methacryloxypropyltrimethoxysilane (KH570) has been prepared via in situ emulsion polymerization and studied the influence of KH570 on thermostability, tensile behavior and water resistance of nanocomposite. The structure of the nanocomposite was characterized by Fourier transform infrared (FTIR), X-ray diffraction (XRD) and transmission electron microscopy (TEM). The Morphological studies showed that the OMMT was satisfactorily dispersed in the PVAc/OMMT/KH570 nanocomposite and most of them were exfoliated. Thermal properties of the samples were investigated by thermogravimetric analysis (TGA). Thermogravimetry results indicated that the initial weight-loss temperature of PVAc/OMMT/KH570 nanocomposite was enhanced from 241.0 to 298.5°C. The tensile strength was 11.4 ± 0.3 MPa for PVAc/OMMT/KH570 nanocomposite while the value of PVAc was 7.6 ± 0.3 MPa. And the water-resistance obtained by means of water-solution content and water absorption analysis was improved remarkably as well. Generally speaking, we synthesized PVAc/OMMT/KH570 nanocomposite with excellent thermostability, good mechanical property and superior water-resistance.