查找使用阿拉丁产品的科研文献

Aggregation Behavior Modulation of 1-Dodecyl-3-methylimidazolium Bromide by Organic Solvents in Aqueous Solution

Jianji Wang,Lamei Zhang,Huiyong Wang,Changzeng Wu

Material preparation in ionic liquids and environmental pollution control by ionic liquids are often closely dependent on the aggregation behavior of ionic liquids in solution. In the present work, conductivity, fluorescence probe, and dynamic light scattering techniques have been used to study the effect of organic solvents on the aggregation behavior of 1-dodecyl-3-methylimidazolium bromide in water. It was shown that the critical aggregation concentration (CAC), the ionization degree of the aggregates (α), and the standard Gibbs energy of aggregation (ΔGm°) of the ionic liquid increase, while its aggregation number (Nagg) and aggregates’ size decrease with increasing concentration of organic additives in water. These results have been discussed from the favorable interactions of alkyl chain of the ionic liquid with the mixed solvents. It is suggested that the solvophobic parameter, characterized quantitatively by Gibbs energy of transfer of hydrocarbon from gas into a given solvent, can be used to account for the effect of organic additives on the formation and growth of the ionic liquid aggregates in water. Aggregation behavior of ionic liquids in aqueous organic solutions can be modulated simply by the solvophobic parameters of hydrocarbon in the mixed solvents.

Effect of Zr4+ doping on the electrochemical properties of Na3MnTi(PO4)3/C cathode materials

Qi Qi,Xiaodong Li,Jianquan Liang,Kangyi Chen,Mingxuan Zong,Xinghai Li,Li Zhao,Changsong Dai

NASICON structural materials have the advantages of structural stability, high ion conductivity, and high working potential, which have attracted widespread attention as cathode for sodium-ion batteries. Although the three-electron reaction in the NASICON structure Na 3 MnTi(PO 4 ) 3 increases the specific capacity of the material, poor electronic conductivity remains a key factor restricting its practical application. Herein, Na 3 Mn 1-x Zr x Ti(PO 4 ) 3 /C (x = 0, 0.01, 0.03, 0.05, 0.07 and 0.1), a typical three-dimensional NASICON structure cathode material for sodium-ion batteries, was synthesized by the sol-gel method. Through powder X-ray diffraction, the Zr 4+ doping in the Na 3 MnTi(PO 4 ) 3 (NMTP) structure was verified. It was found that doping trace amounts of Zr at the Mn site can not only reduce the Jahn-Teller effect caused by Mn 3+ , but also strengthen the Zr-O bond compared to the Mn-O bond, making the crystal structure more stable by reducing the proportion of Mn. According to the findings of the EIS test, a suitable amount of Zr doping can enhance the electronic conductivity and Na ion diffusion coefficient of NMTP/C electrode materials, weaken polarization phenomena, increase electrode reaction rate, and significantly improve the rate performance and cycling performance of Na 3 Mn 1-x Zr x Ti(PO 4 ) 3 material. The Na 3 Mn 1-x Zr x Ti(PO 4 ) 3 /C sample prepared has high initial capacity of 124mAh/g, a capacity retention rate of 86 % after 200 cycles at 0.2C, and a capacity retention rate of 84 % after 500 cycles at 1C. This proves that the material still exhibits excellent cycling stability and structural stability after high current cycling. More importantly, the Na 3 Mn 0.95 Zr 0.05 Ti(PO 4 ) 3 (Zr5-NMTP)//Hard carbon full battery also exhibits ideal electrochemical performance.

Unraveling the modified regulation of ternary substitution on Na3V2(PO4)3 for sodium ion batteries

Shiqi Sun,Yanjun Chen,Qiang Bai,Que Huang,Changcheng Liu,Shengnan He,Yaxiong Yang,Yanzhong Wang,Li Guo

The emergence of three-dimensional Na3V2(PO4)3 (NVP) has attracted a lot of attention due to its high reversible capacity and long voltage platform. Unfortunately, its popularization and application are limited by its poor intrinsic conductivity. Herein, a convenient sol–gel method is proposed to synthesize potassium/lanthanum/silicon co-substituted NVP. The potassium ions are responsible for extension along the c axis while the other two ions facilitate the expansion of the crystal structure along the other directions. Accordingly, the ternary substitution reduces the resistance existing in the neighboring coordination environment and improves the stability of the crystal framework by enlarging the migration channels for Na+. Significantly, with the simultaneous function of ternary substitution, slight lattice distortions occur in the bulk and more active sites for reversible de-intercalation of Na+ emerge, favorably supplementing the discharge capacity during the period of structural phase transition. Moreover, first-principles calculations demonstrate that the introduction of three heteroatoms could decrease the gap between the conductive and valence bands and reduce the energy barrier for sodium migration. The optimized Na3.03V1.93La0.07(PO4)2.9(SiO4)0.1 possesses a superior sodium storage property in both half- and full-cells. This work reveals the distinctive advantages of ternary substitution on the NVP system through theoretical and experimental methods, contributing to further exploration of other cathode materials.

[MnCl3(H2O)3]- to [MnCl6]4-: The effect of inorganic polyhedron transformation on luminescence characteristics

Yuanjie Wang,Tengfei Cao,Zhihuang Xu,Liwang Ye,Xinxin Zhuang

Organic-inorganic hybrid halides (OIHs) have attracted widespread attention because of their exceptional optoelectronic properties. In particular, Mn 2+ -based hybrid halides show intense green or red emission, which benefit from distinct d-d optical transition in Mn 2+ . This work deals with the dual-emission in two novel hybrid single-crystals (N-AEP)[MnCl 3 (H 2 O) 3 ] 2 ·Cl ( 1 ) and [(N-AEP) 2 MnCl 6 ]·2Cl ( 2 ) (N-AEP 3+  = C 6 H 18 N 3 3+ ). Luminescence properties studies indicate that the low-energy emission is assigned to the Mn 2+ -based octahedron , while the high-energy emission ascribes to the organic cation [N-AEP] 3+ . Inorganic polyhedron transformation ([MnCl 3 (H 2 O) 3 ] - to [MnCl 6 ] 4- ) increased the luminescent intensity, which benefited from the weaker nonradiative transition in [MnCl 6 ] 4- octahedron. Significantly, by finely adjusting the excitation wavelength, complex 2 showed tunable emission properties, realizing the transition from “warm” white light (0.40, 0.33) to “cold” white light (0.28, 0.28). This paper offers a new example on the effective design of dual-emission materials.

Electrostatic energy storage performances of La(Ni2/3Ta1/3)O3-modified Na0.5Bi0.5TiO3 lead-free ceramics

Nan Weng,Ji Zhang,Jiajia Wang,Tianze Pan,Jing Wang,Yaojin Wang

Ceramic capacitors with high electrostatic energy storage performances have captured much research interest in latest years. Sodium bismuth titanate (Na 0.5 Bi 0.5 TiO 3 )-based ferroelectric ceramics show great potential due to their environment-friendly composition, high polarization, and excellent relaxor properties. However, the nonergodic relaxor state of Na 0.5 Bi 0.5 TiO 3 -based ceramics hampers the decrement of remanent polarization, leading to poor energy storage performance. Herein, the (1 − x )Na 0.5 Bi 0.5 TiO 3 – x La(Ni 2/3 Ta 1/3 )O 3 ceramics were designed to generate the transformation between nonergodic and ergodic relaxor state. As a result, the ceramics exhibit improved dielectric relaxation, slim polarization–electric field loops, and flattened current–electric field curves due to highly dynamic polar nanoregions. Particularly, the 0.85Na 0.5 Bi 0.5 TiO 3 –0.15La(Ni 2/3 Ta 1/3 )O 3 ceramics show large breakdown electric field E b (345 kV/cm), high recoverable energy density W rec (3.6 J/cm 3 ), and efficiency η (80.6%), revealing potential applications in electrostatic energy storage.

Defect passivation grain boundaries using 3-aminopropyltrimethoxysilane for highly efficient and stable perovskite solar cells

Ronghong Zheng,Shuangshuang Zhao,Hua Zhang,Haoyue Li,Jia Zhuang,Xingchong Liu,Haimin Li,Hanyu Wang

The defects of grain boundaries and film surface are harmful to the efficiency and stability of perovskite solar cells (PSCs). Defect passivation is an effective strategy to improve the performance of PSCs. In this work, a silane coupling agent 3-aminopropyltrimethoxysilane (APMS) was used as an additive of perovskite light-absorbing layer to passivate defects, thereby significantly improving charge transport, reducing charge recombination and improving device performance. The amino group in APMS can not only form a coordinate bond with the uncoordinated Pb in the perovskite, but also form a hydrogen bond with I (N-H⋯I). The crystallinity and uniformity of perovskite grains were improved obviously. Therefore, the addition of APMS greatly reduces the defects of perovskite and the power conversion efficiency (PCE) increased from 18.85% to 20.72% with less hysteresis. Furthermore, a proper carbon chain can be hydrophobic to improve the moisture stability of the perovskite. The PCE of the device remains 60% of the initial device after being placed at a humidity of 50–60% for 400 h. Therefore, this work proves that the use of silane coupling agents as additives is a promising strategy to achieve efficiency and stable PSCs.

Design, Synthesis, and Antimicrobial Activity Evaluation of 5-(3/4-Hydroxybenzylidene)thiazolidine-2,4-dione Derivatives

Lv Yingmei,Shi Lele,Luo Xi,Huang Yuhang,Du Zhenting

Thiazolidine-2,4-dione (TZD), a privileged scaffold, is a versatile pharmacophore and outstanding sulphur-containing heterocyclic compound found in various drugs. In this work, forty-two substituted 5-arylidene-1,3-thiazolidine-2,4-diones derivatives have been designed and synthesized by introducing sulfonyl groups, benzoyl groups, and amide groups into 5-(3/4-hydroxybenzylidene)thiazolidine-2,4-dione through Knoevenagel condensation, and their antibacterial activities were evaluated in vitro. As a result, thirty-five compounds were new compounds, and seven compounds were known compounds. The in vitro assay results disclosed that compared with B/C-series, A-series compounds presented remarkable antimicrobial activity against S. aureus, E. faecalis , and E. faecium . All twenty-one synthesized A-series compounds exhibited excellent antibacterial activity against S. aureus (MIC 80 ≤ 128 µg/mL). Among these, three compounds demonstrated the highest anti- E. faecalis activities (MIC 80 = 8 µg/mL), while E. faecium showed antibacterial susceptibility to A-series compounds except two of the investigated compounds p -cyanophenyl and p -trifluoromethoxyphenyl substituted sulfonate esters. In contrast, the B-series displayed limited activity, with only three compounds showing measurable anti- S. aureus effects, among which substituted phenyl benzoates exhibited the best antibacterial action against E. faecium (MIC 80 = 64 µg/mL). The C-series compounds demonstrated the weakest activity profile, with two N -substituted acetamides ( N -phenyl and N -methylphenyl) displaying moderate anti- S. aureus activity (MIC 80 = 128 µg/mL), which merely compound N - o -nitrophenyl was sensitive to E. faecalis (MIC 80 = 256 µg/mL). SAR analysis revealed that synthetic TZD-derivatives with substituted sulfonyl groups significantly enhanced antibacterial activity against all tested Gram-positive bacterial strains. These molecules may serve as lead compounds for developing more effective and less toxic antibacterial agents.

Butyrophilin-like 3 and 8 tetramers clamp Vγ4Vδ1 T cell receptors for antigen-independent activation

De Dong,Huiling Li,Yuwei Zhu,Zebin Lu,Junliang Zhu,Xinyu Tian,Zhiwei Huang

BTNL3 and BTNL8, butyrophilin-like (BTNL) family receptors, are predominantly expressed on intestinal epithelial cells. The BTNL3-BTNL8 complex selectively activates human Vγ4⁺ T cells, which play critical roles in intestinal immune homeostasis and tissue damage repair. Here, we report the structure of the BTNL3-BTNL8-Vγ4Vδ1 T cell receptor (TCR) complex. The structure reveals that BTNL3-BTNL8 forms an antigen-independent tetramer, in contrast to the phosphoantigen-driven association of BTN2A1-BTN3A1. Two BTNL3-BTNL8 heterodimers clamp a head-to-head TCR homodimer to form a 2:2:2 BTNL3:BTNL8:Vγ4Vδ1 TCR complex, with the Vγ4 HV4 and CDR2 loops jointly engaging BTNL3. Structural alignment indicates that the CD1d binding site on TCR overlaps spatially with one monomer within a TCR dimer, suggesting that TCR dimerization sterically precludes simultaneous engagement of CD1d molecules. Together, our results elucidate the structural mechanism of BTNL3-BTNL8-mediated engagement and activation of Vγ4Vδ1 TCR, offering insights into γδ TCR signaling initiation.

Arp2/3 Inhibition Synergizes With PARP Inhibitors by Impairing Homologous Recombination in Gastric Cancer Cells

Wenlong Li,Xinyue Pei,Yongpei Li,Yanji Lu,Xian Hong,Ming Sui,Qiang Li,Xueying Sun,Jingqiu Wang,Enming Zhang,Yihan Liu,Tao Wang,Jing Xu,Zhihui Deng

Background: Poly(ADP-ribose) polymerase inhibitors (PARPi) have shown limited efficacy in gastric cancer, primarily due to the rarity of inherent homologous recombination (HR) deficiency. The nuclear Arp2/3 complex was recently implicated in DNA double-strand break repair via HR. Here, we investigate whether pharmacological inhibition of Arp2/3 can induce a functional HR-deficient state to synergize with PARPi in gastric cancer cells. Methods: HR repair efficiency was assessed using a direct repeat green fluorescent protein (DR-GFP) reporter assay in HEK-293T cells following Arp2/3 inhibition with CK666, siRNA-mediated knockdown, or CRISPR/Cas9-mediated knockout of ACTR2/ACTR3. HGC-27 and AGS gastric cancer cells were treated with CK666 alone and in combination with olaparib or niraparib. Cell viability and synergy were evaluated by Cell Counting Kit-8 (CCK-8) and clonogenic assays (n = 3 independent experiments). DNA damage and apoptosis were assessed by immunofluorescence for gamma H2A histone family member X (γH2AX) foci (≥100 cells per condition) and Western blot analysis for cleaved PARP. Results: Arp2/3 inhibition with CK666 significantly impaired HR repair efficiency in the DR-GFP assay (p < 0.01). This effect was recapitulated by genetic knockdown or knockout of ACTR2/ACTR3. CK666 alone exerted minimal cytotoxicity, but synergized with both olaparib and niraparib to suppress proliferation (Combination Index <1), reducing the half-maximal inhibitory concentration (IC50) of PARPi by approximately threefold. Combination treatment markedly enhanced γH2AX foci formation (p < 0.0001) and increased the level of cleaved PARP compared with either monotherapy. Conclusions: Inhibition of Arp2/3 compromises HR repair capacity, thereby creating a synthetic lethal interaction with PARP inhibition in gastric cancer cells. This combination strategy represents a promising therapeutic approach to broaden the clinical utility of PARPi in HR-proficient tumors and may also enable dose reduction to mitigate associated toxicities.

Silver-catalyzed [3+2] cycloaddition of imines and isocyanoacetates for the synthesis of polysubstituted imidazolines

Jiahui Ma,Yiming Ma,Huida Qian,Yu Wang,Zhongxue Fang

A silver-catalyzed [3 + 2] cycloaddition of imines with isocyanoacetates was developed. This reaction represents a novel protocol for the efficient and practical synthesis of polysubstituted imidazolines bearing a broad range of substituents with good to excellent yields under mild conditions. The practicality of this cycloaddition was shown by a gram-scale synthesis.

Aerogels Prepared from Enzymatically Modified Canna edulis Starch: Structure and Cyanidin-3-glucoside Adsorption Performance

Although canna (Canna edulisKer) starch possesses high swelling power, it remains an underutilized resource. This study aimed to engineer highly porous, food-grade canna starch aerogels as carriers for cyanidin-3-glucoside (C3G), incorporating enzymatically modified starch fractions prepared via α-amylase hydrolysis followed by lyophilization. Moderate enzymatic modification (sample AG1) effectively tailored the aerogel architecture by selectively removing amorphous regions. This targeted hydrolysis yielded a highly interconnected, hierarchical porous network with a high porosity (92%). Importantly, although this architectural transformation increased the average macroscopic pore size, it preserved mechanical integrity, as evidenced by a compressive strength exceeding 4000 kPa. In contrast, excessive hydrolysis led to pore collapse and structural failure. The AG1 aerogel exhibited a markedly enhanced C3G equilibrium adsorption capacity (43.9 mg/g), outperforming the native starch aerogel (36.0 mg/g). Adsorption data adhered to pseudo-second-order kinetics, indicating that this model provided a better description of the adsorption process, while the underlying adsorption mechanism may involve interactions between C3G and the aerogel matrix, potentially including hydrogen bonding. These results suggest that controlled enzymatically hydrolysis may provide a useful strategy for modulating the hierarchical microstructure of canna starch aerogels, thereby supporting their potential as effective carriers for sensitive bioactive compounds in functional food systems.

Terbium chloride post-treatment for highly efficient and stable Sb2(S,Se)3 solar cells

Shengquan Shan,Jihao Ma,Yang Chen,Lun Zhang,Chengyang Wang,Yanrui Yang,Ru Zhou,Mei Lyu,Jun Zhu

An anion-cation synergistic strategy is adopted by TbCl 3 post-treatment in Sb 2 (S,Se) 3 solar cells. • This strategy induces the further growth of Sb 2 (S,Se) 3 with favorable crystal orientation. • TbCl 3 -treatment suppresses deep-level defects and adjusts band alignment of Sb 2 (S,Se) 3 films. • The champion device achieves a PCE of 10.11% with excellent stability. Antimony selenosulfide (Sb 2 (S,Se) 3 ) is a promising quasi-one-dimensional photovoltaic material in the application of solar cell field because of its outstanding optoelectronic properties. It is extremely difficult to achieve the Shockley-Queisser limit due to the presence of various defects and the less favorable (hk0) crystal orientation in Sb 2 (S,Se) 3 films. Here, we report an anion-cation synergistic strategy to enhance the quality of Sb 2 (S,Se) 3 films by terbium chloride post-treated process. Both Tb 3+ and Cl − ions are incorporated into the crystal lattice of Sb 2 (S,Se) 3 after post-treatment, which is confirmed by X-ray photoelectron spectroscopy and X-ray diffraction. This anion-cation synergistic effect promotes the Sb 2 (S,Se) 3 films to have a preferred (hk1) crystal orientation, larger grain size, suppressed deep-level defects and more favorable energy band alignment to facilitate charge carrier transport. Consequently, terbium chloride post-treatment enhances the performance of Sb 2 (S,Se) 3 solar cells, achieving a remarkable of 10.11%. Furthermore, the champion devices exhibit an excellent storage, humidity and thermal stability over 800 h aging test. This work provides a valuable strategy for fabricating high-quality of Sb 2 (S,Se) 3 films and high-efficiency inorganic horizontal and vertical PN heterostructure solar cells.