查找使用阿拉丁产品的科研文献

Tunable emission from solid-solution phosphors Ba3(Sb,Ta)Ga3Si2O14:Bi3+,Eu3+ for diverse optical applications

Ying Wang,Zeyu Lyu,Pengcheng Luo,Zheng Lu,Dashuai Sun,Taixing Tan,Shuai Wei,Hongyang Zhang,Hanyu Hu,Hongpeng You

A series of solid-solution phosphors Ba 3 Sb 1- y Ta y Ga 3 Si 2 O 14 :Bi 3+ (0.0 ≤  y  ≤ 1.0) were created using the high-temperature solid-state reaction. The crystal structure of Ba 3 Sb 1- y Ta y Ga 3 Si 2 O 14 belongs to trigonal crystal system with space group P321 (150) . The Rietveld refinements indicate that the Bi 3+ ions occupy the Ba 2+ sites. Ba 3 Sb 1- y Ta y Ga 3 Si 2 O 14 :0.03Bi 3+ has tunable luminescence property peaking from 531 to 492 nm as the Sb 5+ ions are gradually replaced by Ta 5+ ions, which are correlated with the crystal field strength variation causing by the substitution of Sb 5+ by Ta 5+ . The thermal stability of the emission at 423 K was improved from 5.4 to 49.9 %. When the obtained Ba 3 SbGa 3 Si 2 O 14 :0.03Bi 3+ /Ba 3 SbGa 3 Si 2 O 14 :0.03Bi 3+ ,0.015Eu 3+ was used as green light component, white LED devices were achieved with low CCT of 4613/4748 K and high Ra of 90.9/95.5. Moreover, multicolor luminescence was constructed by introducing red-emitting Eu³⁺ ions to create Ba 3 SbGa 3 Si 2 O 14 :0.03Bi 3+ ,0.015Eu 3+ and Ba 3 TaGa 3 Si 2 O 14 :0.03Bi 3+ ,0.015Eu 3+ phosphors. Under different excitation conditions, the multicolor emissions provide multi-modal and easily distinguishable anti-counterfeiting patterns. Our work demonstrates the feasible construct of tunable emission from Bi 3+ -doped solid-solution phosphors, providing a valuable candidate for diverse optical applications.

Reactive hot-pressing induced low temperature densification of (Zr,Ta)B2-SiC ceramics: microstructure and strengthening

Cheng Su,Bingzhu Wang,Huan Guo,Jixiang Dai,Jianjun Sha

In view of the high sintering temperature and difficulty in densification of the ultra-high temperature ceramics(UHTCs), a novel reactive hot-pressing process was designed to achieve the low temperature densification of high strength (Zr,Ta)B 2 -SiC ceramics. It was found that the mechanical properties were closely associated with the microstructure, being dependent on the sintering temperature. The microstructure characterization revealed that the main phases of ceramic were incompletely solid soluted borides and SiC at the sintering temperature of 1600 °C; while at 1700 °C, the boride ceramics were completely solid soluted (Zr,Ta)B 2 and formed an interlocking structure with SiC. The evaluation of mechanical properties indicated that the flexural strength of the ceramics increased from 470.2 MPa to 736.7 MPa when the sintering temperature increased from 1600 °C to 1800 °C. Correspondingly, the fracture toughness increased from 3.54 MPa·m 1/2 to 4.10 MPa·m 1/2 . The improvement of mechanical properties were mainly attributed to the interlocking structure formed by the solid solution (Zr,Ta)B 2 and SiC, which caused the crack propagation path becoming tortuous along the interface of different phases.

Separation-free artificial photosynthesis of concentrated hydrogen peroxide and value-added fuels over Ta atomic sites

Tan Hao,Zhou Peng,Gu Yu,Liu Youxing,Chen Wenxing,Guo Hongyu,Lin Fangxu,Luo Heng,Cao Xiaoqing,Zeng Lingyou,Luo Mingchuan,Guo Shaojun

Solar-driven artificial photosynthesis of hydrogen peroxide and high-value chemicals from oxygen and biomass is promising but is hindered by poor light absorption, sluggish kinetics of biomass dehydrogenation, and low oxygen reduction selectivity. Herein, we develop a resorcinol-formaldehyde resin/carbon-supported Ta-N 2 O 2 single-atom catalyst (RF/C-TaSA) that enables broad-spectrum light harvesting (> 932 nm) and selective biomass conversion in a solid-organic-aqueous three-phase system. RF/C-TaSA achieves a high 3.0% quantum yield at 635 nm, with Ta-N 2 O 2 sites stabilizing intermediates and reducing the energy barrier for biomass conversion. We further demonstrate that RF/C-TaSA enables efficient artificial photosynthesis of H 2 O 2 and value-added chemicals from more available thatch, pine needles and wastepaper. Combining catalyst innovation and system engineering, we build a solar-powered RF/C-TaSA-based photocatalytic device for directly producing commercially viable H 2 O 2 at a high concentration of 3 wt% and high-value-added chemical without requiring energy-intensive separation processes for 70-day operation. Furthermore, the produced crude concentrated H 2 O 2 can also be readily converted to solid H 2 O 2 powder (Na 2 CO 3  ∙ 1.5 H 2 O 2 ) for ease of storage and transport with high sterilization activities even after 6 months.

Multifunctional TA-CuS NPs-based conductive hydrogel with antibacterial capability for wearable real-time human motion sensor

Lijia Zhao,Shuang Ma,Huan Wang,Zekun Chen,Ren Wang,Guiye Shan

Hydrogel-based flexible sensors have attracted significant attention in the fields of motion sensing. However, the construction of hydrogel substrate with long-term stability for humid and sweating conditions sensing still remains challenging. Herein, tannic acid-modified copper sulfide nanoparticles (TA-CuS NPs)-based multifunctional hydrogel with excellent adhesion, mechanical strength, swelling ability and antibacterial properties was developed as wearable sensor for sensitive and durable motion monitoring in moist environments. The hydrogel, containing abundant phenolic hydroxyl groups, allows dynamic cross-linking with sodium alginate (SA) and polyacrylamide (PAM), improving tensile strain to 1590 % and adhesion strength to 32 kPa. Meanwhile, its electrical conductivity increased from 0.02403 S·m −1 to 0.11432 S·m −1 , attributed to the formation of conductive pathways and interfacial interactions between TA-CuS NPs and polymer chains. Additionally, the incorporation of ions and hydrophilic functional groups within the hydrogel imparts superior swelling behavior and ionic conductivity, which facilitates sweat adsorption and stable signal transmission. Further, the peroxidase-like (POD)-like activity of TA-CuS NPs-based hydrogel promotes the generation of hydroxyl radicals (·OH), effectively inhibiting the growth of both Staphylococcus aureus (88.0 %) and Escherichia coli (93.8 %) within 24 h. As a result, this multifunctional flexible hydrogel-based sensor, endowed with sweat management and antibacterial capability can achieve the real-time and reliable human motion monitoring in wet scenarios with the working range of 0–500 %, and can further combine with designed integrated circuit and Bluetooth for wireless signals output. This designed wireless system allows for the recognition of various motions and provides early warnings of harmful motions, demonstrating the potential for practical application in the field of wearable sensing.

Multifunctional Crosslinked PAA–TA Binder: Robust Structural Integrity and Suppressed Manganese Dissolution for High–Performance LiMn0.6Fe0.4PO4 Cathodes

A poly (acrylic acid–tannic acid) (PAA–TA) crosslinked composite is reported on for the first time as an aqueous binder for LiMn0.6Fe0.4PO4(LMFP) cathodes to suppress manganese dissolution. Benefiting from hydrogen bonding and chemical crosslinking, the PAA-TA binder constructs a robust three-dimensional network that strengthens the interfacial adhesion among active particles, conductive additives, and the current collector, stabilizing the LMFP crystal structure upon cycling. More importantly, this polymeric network effectively restrains manganese leaching, which is the major origin of the capacity fading of LMFP cathodes. Meanwhile, continuous electron and ion transport pathways are well established. The LMFP electrode with an optimized PA5TA1 binder delivers a reversible capacity of 112 mAh g−1at 5 C and retains 81.3% of its capacity after 300 cycles, outperforming the PVDF/LMFP electrode. Post–mortem analyses of cycled LMFP cathodes further confirm that there was substantially suppressed Mn2+dissolution in the PAA–TA electrode, corroborating the structural integrity of the cathode–electrolyte interface. This crosslinked aqueous polymer provides a sustainable alternative to the PVDF binder for long–life LMFP cathodes.

Magnetron sputtering deposition of titanium films on the surface of Li₆.₄La₃Zr₁.₄Ta₀.₆O₁₂ electrolyte tablets

Zexian Xu,Wen Zhu,Weixing Liu,Wenbo Liu,Zican Liu,Ken Chen,Kang Li,Peiqi Lun,Jiawei Zhu,Muhammad Idrees,Saima Batool

The garnet-type Li 6.4 La 3 Zr 1.4 Ta 0.6 O 12 (LLZTO) is considered a promising solid-state electrolyte (SSE) due to its high ionic conductivity and electrochemical stability. However, the surface of LLZTO easily reacts with H 2 O and CO 2 in the air, forming a passivation layer of Li 2 CO 3 . This reaction further deteriorates the interface between LLZTO and the Li anode, resulting in poor wettability. Consequently, significant gaps form between LLZTO and the Li anode, leading to uneven deposition of Li during the cycling. Li dendrites can grow into these gaps, eventually penetrating the electrolyte and causing a short circuit in the battery. In this study, a surface modification method is investigated, where a thin film of titanium is deposited onto the surface of LLZTO electrolyte tablets using magnetron sputtering. The effects of magnetron sputtering deposition titanium film process parameters—chamber pressure, bias voltage, and temperature—on the electrochemical properties of button cells were investigated. The results indicated that LLZTO electrolyte tablets coated with titanium exhibited low interfacial resistance, high cycle stability, and significant inhibition of Li dendrites under optimized conditions of 1.0 Pa chamber pressure, 100 V bias voltage, and 150 ℃ temperature. Under these conditions, the interface resistance decreased significantly from 1437.9 Ω to 190.19 Ω. Additionally, the Li symmetric cell assembled with the titanium-coated LLZTO electrolyte tablet demonstrated stable cycling for over 1200 h at 25 ℃ under a current density of 0.1 mA·cm −2 .

Controllable adjustment of Ta and Cu material removal rate in TSV tantalum-based barrier layer planarization process

Du Zhanjie,Wang Ru,Liu Bin,Zheng Tao,Dong Yanwei,Chen Xuhua,Liu Zeyu,Han Shengxing,Zeng Yao,Li Yiken

Through Silicon Via (TSV), a kind of 3D packaging technique, can improve chip integration based on “More than Moore” scheme. The larger copper area ratio at the TSV barrier layer interface requires strong adjustability of the removal rate selection ratio of copper, tantalum and TEOS–SiO 2 , and stronger surface defect control and surface profile correction capabilities. In this paper, the effects of guanidine hydrochloride (GH) and 2,2′-[[(Methyl-1H-benzotriazol-1-yl)methyl]imino]bisethanol (TT-LYK) system on the tunability of Ta and Cu removal rate in chemical mechanical polishing (CMP) of TSV wafer barrier material were studied. GH can complex \({\text{TaO}}_{4}^{{3}-}\) , while TT-LYK can form a protective film on the surface of Cu, thereby achieving rate regulation. The results showed that when the concentration of GH increased from 0 to 2 wt%, the removal rate selectivity ratio of Ta and Cu raised from 1.02:1 to 1.26:1. When the concentration of TT-LYK increased from 2.5 to 10 mmol/L, the removal rate selectivity ratio of Ta and Cu increased from 1.33:1 to 1.79:1, which verified that the GH and TT-LYK systems can efficiently regulate the rate and rate selection ratio of Ta and Cu. Surface roughness for both metals decreased from pre-polishing values of 5.03 nm to post-polishing values of 0.37 nm for Ta, from pre-polishing values of 5.33 nm to post-polishing values of 1.26 nm for Cu indicating that GH and TT-LYK systems significantly improved the surface quality. Graphical abstract

Enhanced tetracycline degradation efficiency by CoFe2O4 decorated TA-ZIF-8 catalyst via activating peroxymonosulfate under confinement effect

Na Yang,Hao Jiang,Longfei Zhang,Xiang Wang,Luhong Zhang,Yongli Sun,Bin Jiang

Spinel oxides can be considered effective heterogeneous catalysts in activating peroxymonosulfate (PMS) for wastewater decontamination . However, the intrinsic characteristics of agglomeration and metal ion leaching impede its further application. In this work, to further improve the catalytic efficiency and stability of the catalyst, ZIF-8 was employed as the candidate and further etched by tannic acid (TA) to obtain a core-shell structure with less mass transfer resistance. Following this, CoFe 2 O 4 was anchored on TA-ZIF-8 matrix via a hydrothermal method. Benefiting from the tailored core-shell structure and high activity of CoFe 2 O 4 , the as-prepared CoFe 2 O 4 @TA-ZIF-8 catalyst shortened the mass transfer distance of radical to target pollutant, thus realizing high radical utilization efficiency. Accordingly, 98.1% of tetracycline (TC) can be eliminated in 30 min with kinetic constants 3.15 times higher than pristine CoFe 2 O 4 . Besides, the TC degradation efficiency can still maintain 84.1% after five consecutive cycles with cobalt leaching lower than 0.306 mg/L, showing favorable stability compared with pristine CoFe 2 O 4 . Furthermore, electron paramagnetic resonance (EPR) and quenching experiments exhibited that singlet oxygen and sulfate radicals play dominant roles in TC degradation processes. This work fabricates an efficient CoFe 2 O 4 @TA-ZIF-8 heterogeneous catalyst for degrading refractory TC, which may possess potential applications in wastewater treatment .

Robust PAAm-TA hydrogel coated PVDF membranes with excellent crude-oil antifouling ability for sustainable emulsion separation

Yuxie Jiang,Caiyun Xian,Xuanfei Xu,Weiwei Zheng,Tianxue Zhu,Weilong Cai,Jianying Huang,Yuekun Lai

Hydrogel coating was widely studied in the field of oil/water separation due to its underwater superoleophobic performance, which could avoid the blockage of the separation membrane by oil effectively, especially high viscosity crude oil. In this manuscript, a layer of ultra-thin Polyacrylamide-Tannic (PAAm-TA) hydrogel coating was coated on the surface of PVDF microfiltration membrane by a simple immersion process, which could endow it with superhydrophilic and underwater superoleophobic performance. Due to the outstanding superhydrophilic and ultrathin hydrogel coating, the obtained sample showed an ideal emulsion separation efficiency and flux, 99.47% and 1184.3 L/(m 2  h bar) for toluene-in-water emulsion. Additionally, the residual crude oil on the membrane surface can be easily and quickly removed by rinsing with water. Attributed to a variety of chemical and hydrogen bonding and negatively charged groups on the tannic acid molecules, the membranes possess good mechanical stability and electrostatic adsorption properties. The obtained PVDF/PAAm-TA membrane could maintain its special wettability in a wide range of chemical environments, enabling it great potential to be used in complex water treatment. In summary, this study will provide new insights into a new idea and method for the preparation of hydrogel coated porous materials for oil/water separation.

A novel polyurea nanofiltration membrane constructed by PEI/TA-MoS2 for efficient removal of heavy metal ions

Yeyuan Feng,Xiaorong Meng,Zhenpeng Wu,Jin Chen,Chi Sun,Shanshan Huo

Heavy metal pollution poses a serious threat to human health. Positively charged nanofiltration membranes show excellent application prospects in the field of heavy metal removal due to the combined effect of electrostatic repulsion and size sieving. Here, molybdenum disulfide (MoS 2 ) nanosheets were dispersed in aqueous solution polyethyleneimine (PEI) by virtue of the adhesion effect of tannic acid (TA). Positively charged polyurea NF membranes (TSPU) were prepared by interfacial polymerization of aqueous phase PEI/TA-MoS 2 and organic phase 2,4-toluene diisocyanate (TDI). The surface of the optimized membrane TSPU-0.015 showed better hydrophilicity, the water contact angle was 74.53°, and the functional layer thickness of TSPU-0.015 was 114.8 nm. TSPU-0.015 interface was positively charged (IEP TSPU - 0.015  = 5.62), so the rejection of magnesium salts is significantly higher than that of sodium salts. It shows a retention performance of more than 99% for high-valent heavy metal ions such as Fe 3+ and Cu 2+ , and the retention for Cd 2+ is as high as 92.53%. The permeation flux of TSPU-0.015 is 2.88 times higher than that of undoped MoS 2 (TSPU-0), and the flux to MgSO 4 solution reaches 34.5 L/m 2 ·h (6 bar, R (MgSO4)  = 93.18%). TSPU has long-term stable operation and excellent anti-pollution properties, showing wide application potential in the fields of inorganic salt separation and heavy metal pollution.

Metal modified (Ni, Ce, Ta) Ti/SnO2–Sb2O5–RuO2 electrodes for enhanced electrochemical degradation of Orange G

Zhao Ruiyu,Wang Yi Mou,Li Jie,Meng Wenhua,Yang Chunli,Sun Chongxiang,Lan Xuefang

Ni, Ce, and Ta modified Ti/SnO 2 –Sb 2 O 5 –RuO 2 anodes were first prepared by thermal decomposition strategy and applied for Orange G degradation to explore the effect of Ni, Ce, and Ta modification on electrocatalytic property. The Ta modified anode showed the highest ·OH generation capability and the lowest charge transfer resistance among all samples, conducive to electrocatalytic degradation of Orange G. Besides, the Ta modified anode shows more cracks than Ni and Ce modified anodes, which is expected to create more specific surface areas and more exposed active sites for Orange G degradation. The degradation efficiency and the total organic carbon (TOC) removal rate increased in the order Ru < Ru–Ni < Ru–Ce < Ru–Ta, with Ru–Ta showing the highest degradation efficiency of 98.6% and 44.2%, much higher than 79.6% and 27.5% of Ru, respectively. Graphical abstract

Design of a novel TA-MoS2 nanosheets interlayer-based loose nanofiltration membrane for enhanced dye/salt separation

Jinsong He,Tingyan Deng,Linzhi He,Xiaochan An,K.G. Nadeeshani Nanayakkara,Fei Shen,Yanzong Zhang,Jianmei Zou,Li Zhao

From the view of sustainable development, the loose nanofiltration (LNF) membrane with high permeability and excellent separation of dye/salt mixture becomes more attractive for dye-containing wastewater. However, the previous LNF membranes inevitably suffered from the permeability-selectivity trade-off due to the inherent nature of polymer-based selective layer. This study reported a tannic acid (TA)-MoS 2 nanosheets (NSs) interlayered nanocomposite polyester (PE) LNF membrane (iLNF-3) that exhibited a remarkably enhanced water permeance of 55.8 LMH·bar −1 compared to the control LNF membrane of 27.3 LMH·bar −1 , and a higher separation selectivity of dye/salt (rejection rate: 99.6 % for congo red, 98.0 % for methyl blue, 5.6 % for Na 2 SO 4 , respectively). Furthermore, the iLNF-3 showed high ionic interference resistance, long-term stability, and superior antifouling performance. The enhanced permeance and dye/salt separation were mainly attributed to the introduction of a high-permeability TA-MoS 2 NSs interlayer . In particular, the permeability was improved due to the “gutter” effect and nanochannels and the formed thinner PE selective layer caused by TA-MoS 2 NSs interlayer. Notably, the selectivity was enhanced owing to the looser porous structure of PE layer resulting from the slow diffusion rate of aqueous monomer . This study can provide a foundational framework for the development of iLNF membranes for treating dye containing wastewater.