查找使用阿拉丁产品的科研文献

Pressure-Induced Effects in Cs2Na0.6Ag0.4InCl6:Bi3+ Microcrystals − An Experimental and Theoretical Study

Saranya Narayanan,Saeed Samadi,Daniel Errandonea,Jing Wang,Hongbin Liang,Damian Wlodarczyk,Hanka Przybylińska,Neha Bura,Catalin Popescu,Agnieszka Pieniazek,Ajeesh Kumar Somakumar,Chong Geng Ma,Bibo Lou,Ryszard Buczko,Andrzej Suchocki

Cs 2 AgInCl 6 -based double perovskites have recently attracted attention due to their direct electronic band gap and have been identified as promising candidates for a wide range of device applications. Various doping methods applied to this material, including doping with Bi along with precise adjustments of its composition, have resulted in enhanced luminescence. In this work, results of high-pressure studies of structural, vibrational, and luminescent properties of Cs 2 Na 0.6 Ag 0.4 InCl 6 :Bi 3+ are reported. High-pressure X-ray diffraction and Raman spectra consistently reveal a reversible structural phase transition from a cubic to a tetragonal structure at a pressure of about 11.5 GPa. High-pressure photoluminescence results (PL) are consistent with recombination of a defect-bound exciton. It is suggested that the defect is related to bismuth. This luminescence is strongly quenched above 3.5 GPa. A possible mechanism based on level crossing of the exciton ground state and the valence band maximum is discussed, which is qualitatively consistent with the observed pressure-dependent PL quenching and the calculated host-band evolution.

Unraveling the Microbial Associations of Volatile Flavor Profiles in Spontaneously Fermented Camel Milk from Three Regions of Xinjiang, China

Yating Wu,He Chen,Fulan Wang,Henigul Osman,Shiqi Zhang,Hongyan Zhang,Shuai Wang,Nan Zheng,Yankun Zhao

Spontaneously fermented camel milk from Xinjiang is valued for its nutrition but faces quality inconsistency due to complex microbial ecosystems. This study investigated how regional microbial communities correlate with volatile flavor profiles. Nine samples from three distinct areas—Dabancheng, Hami, and Keping—were analyzed using bacterial 16S rRNA gene and fungal ITS region amplicon sequencing combined with comprehensive two-dimensional gas chromatography–time-of-flight mass spectrometry (GC×GC-TOF MS). Bacterial communities were dominated byFirmicutesandProteobacteria, whileAscomycotaandBasidiomycotaprevailed among fungi. Dominant genera varied by region:LactobacillusandDekkerain Dabancheng;LactobacillusandDipodascusin Hami;LactococcusandCutaneotrichosporonin Keping. Flavor profiles also diverged, with Dabancheng being rich in esters, alcohols, and ketones; Hami featuring hydrocarbons and alcohols; and Keping containing elevated hydrocarbons, alcohols, and esters. Key statistical associations were identified:Lactobacillus,Rahnella, andAcetobacterwere positively associated with propene and 3-decyn-2-ol (VIP > 1.0, |r| > 0.8), whilePseudomonas,Lactococcus, andKlebsiellashowed negative correlations with vinyl n-caproate. These findings reveal statistical associations between geographic origin, specific microbial taxa, and flavor attributes, providing a scientific foundation that may inform future efforts toward developing targeted starter cultures pending microbial isolation and functional validation.

Asymmetrically Coordinated Ni-Based Single-Atom Catalyst Enables Ultra-Wide Potential Window for Ampere-Level CO2 Electroreduction

Weiqi Lu,Zhenyang Dai,Ruichao Xu,Yufeng Chen,Min Ge,Wenxue He,Jinglin Yuan,Yanna Shui,Ya Pan,Yong Zhang,Chao Wang,Yajuan Feng,Shi He,Zhihu Sun

Conventional Ni–N 4 single-atom catalysts (SACs) hold great promise in sustainable energy conversion and storage, but suffer from weak * COOH adsorption and narrow potential windows during CO 2 electroreduction (CO 2 RR). To address this limitation, herein we report an asymmetric Ni–N 3 O 1 SAC prepared via an oxygen-mediated spatial confinement pyrolysis strategy. Theoretical calculations predict that this unique asymmetric coordination can effectively lower the * COOH formation energy, promote the interaction between the catalyst and * COOH, and suppress the competing hydrogen evolution reaction in CO 2 RR. The prepared Ni–N 3 O 1 SAC features a distorted planar quadrilateral structure and demonstrates exceptional performance in CO 2 -to-CO conversion, with a maximum turnover frequency of 207 700 h −1 , a maximum CO partial current density of 810 mA cm −2 , and CO Faradaic efficiency of ≥ 99% over an ultra-wide potential window of 2100 mV (−0.3 to −2.4 V vs. reversible hydrogen electrode) in a flow cell. A combination of in situ spectroscopic measurements verifies the reversible structural evolution and robust stability of the Ni–N 3 O 1 SAC under CO 2 RR conditions, as well as the strengthened * COOH formation and accelerated CO 2 activation kinetics. This work provides a feasible route for designing and synthesizing high-performance asymmetrically coordinated SACs toward industrial CO 2 -to-CO conversion.

Study on the Promotion of Methane Hydrate Formation by Surface Modification of Quartz Sand

Du Wang,Yuru Chen,Chang Chen,Xiaosen Li,Yu Zhang,Zhaoyang Chen

Natural gas hydrates, with their vast reserves and high gas storage density, have emerged as a highly promising alternative energy source and technology for gas storage and transportation. Wettability, as a core surface property of porous media, directly influences hydrate nucleation, growth, occurrence morphology, and flow behavior. In this study, quartz sand with varying surface properties was prepared with the octyltrimethoxysilane (OTMS) silane coupling agent via surface chemical reactions. The methane hydrate (MH) equilibrium conditions as well as the formation kinetics in silica sand were measured, and the mechanism and potential of the surface modification for enhancing methane hydrate storage capacity were analyzed. The experimental results indicate that surface modification of quartz sand has no significant effect on the MH equilibrium condition. Hydrophobic modification of quartz sand provides more gas–liquid interfaces, increases the contact area, and thereby significantly enhances mass transfer under high-water-saturation conditions and accelerates the MH formation rate. However, excessively high surface hydrophobicity may reduce the effective gas–liquid interfacial area and limit the overall hydrate formation rate. Due to the influences of the hydrate distribution and aggregation, as well as gas diffusion on hydrate formation, the effect of the initial formation pressure on MH formation is only observed during the early stages of MH formation, while the temperature effect is less pronounced than that of formation pressure. It is suggested to further consider combining stirring with continuous gas injection to enhance gas–liquid flow and improve gas–liquid contact, thereby increasing the formation rate of hydrates.

Singlet Oxygen-Mediated Degradation of 17β-Estradiol by Peracetic Acid Activated over Co Species Confined in Carbon Nanotubes

Jie Teng,Yuzhen Zhang,Xiangbo Ma,Wencheng Zhu,Pu Li,Mingguo Peng

17β-Estradiol (E2), a highly bioactive steroid estrogen, poses potential ecological risks even at trace concentrations in aquatic environments. In this study, a nanoconfined Co-based catalyst (Co@Cin) was employed to activate peracetic acid (PAA) for efficient E2 degradation. Microscopic and spectroscopic characterizations indicated that Co-containing species were highly dispersed within the CNT-based architecture, while the graphitic tubular framework was largely preserved. Compared with PAA alone, CNTs, Co@Cinalone, and the externally loaded Co@Cout/PAA system, Co@Cin/PAA exhibited substantially faster E2 degradation. Pseudo-first-order kinetic analysis further demonstrated the enhanced degradation kinetics of the internally confined system. Importantly, ICP analysis showed comparable Co loadings for Co@Cinand Co@Cout, while Co@Cinretained a markedly higher Co-normalized apparent kinetic activity, indicating that its enhanced performance cannot be explained simply by differences in total Co loading. Moreover, Co@Cinexhibited substantially lower Co leaching than Co@Coutand maintained considerable catalytic activity over five consecutive cycles, demonstrating improved stability of the confined Co species. The degradation performance was influenced by initial E2 concentration, catalyst dosage, PAA concentration, and pH, while Cl−and NO3−showed negligible effects and humic acid and CO32−caused only moderate inhibition. Scavenging experiments and controlled TEMP-EPR measurements with appropriate blank and control systems supported a dominant contribution of singlet oxygen (1O2), with radical pathways playing only minor roles. The enhanced performance is therefore associated with the nanoconfined reaction environment, which promotes efficient PAA activation while stabilizing the Co species. This work extends nanoconfinement-regulated PAA oxidation to the treatment of the highly bioactive steroid estrogen E2 and provides a quantitative assessment of the activity–stability advantages of internally confined Co species.

Atmosphere-Dependent Laser Ablation Behavior and Graphitization of Diamond With Different Crystallographic Orientations

Shao-rong Bie,Yantao Gong,Ding-shun She

Laser ablation is an effective technique for fabricating microstructures on diamond surfaces; however, the influence of ambient atmosphere on the ablation behavior and surface chemistry remains insufficiently understood. In this study, nanosecond laser ablation experiments were performed on single-crystal diamond under different gaseous environments (O 2 , air, N 2 , He, and Ne). The ablation morphology, graphitization behavior, and surface chemical bonding were characterized using laser confocal microscopy, Raman spectroscopy, and X-ray photoelectron spectroscopy (XPS). The results show that the ambient atmosphere significantly affects the ablation efficiency and surface structure. Oxidizing atmospheres (O 2 and Air) lead to higher material removal rates due to thermochemical oxidation reactions, while inert atmospheres (He and Ne) produce smoother groove edges and more uniform surfaces. Raman analysis indicates that the graphitization degree varies with atmosphere, with the intensity ratio of the D and G bands following the order N 2 > Ne > He > Air > O 2 . XPS results reveal that oxidizing atmospheres increase the content of oxygen-containing bonds (C─O/C═O), whereas nitrogen and inert atmospheres favor the formation and accumulation of sp 2 carbon.

Compatibility, Microstructures and Performance of Polylactic Acid, Epoxidized Soybean Oil and Cellulose Fiber Eco-Composites

Jingwen Hu,Qiang Dou

Nowadays, natural fibers reinforced bio-composites have achieved remarkable development, but their shortcomings in low toughness, high hydrophilicity and poor heat resistance cannot be ignored. Herein, epoxidized soybean oil (ESO) and wood-based cellulose fiber (CF) are used as the plasticizer and reinforcing filler to modify polylactic acid (PLA). In order to boost interfacial adhesion and compatibility of the composites, the silane coupling agent KH 580 (3-mercaptopropyl triethoxysilane) was used to treat CF. The epoxy-carboxyl and epoxy-thiol dual reactions during the melt-blending are utilized to promote the compatibilization of ternary components. The tensile strength of 1 wt% K0-CF composite is 47.25 MPa, which is 1.22 times greater than that of unmodified CF composite; meanwhile, the notched impact strength of 1 wt% K0-CF composite is 6.23 ± 0.38 KJ/m 2 , which is 1.2 times higher than that of pure PLA. The addition of K0-CF enhances the hydrophobicity, interfacial adhesion, melt viscosity and elasticity of the composites. The initial decomposition temperatures and residues of the composites are significantly increased due to excellent thermal stability of CF. Both fibers promote the crystallization of PLA, especially for unmodified CF. Due to excellent mechanical, rheological and thermal properties of PLA/ESO/K0-CF composites, they show potential applications in packaging fields. Highlights Silanization improves the hydrophobicity of CF. Interfacial adhesion of silanized CF composites is enhanced. Cellulose fibers improve the crystallization of PLA. Tensile and rheological properties of silanized CF composites are increased.

Preparation of Oxygen-Doped Amorphous MoS2 and Its Electrocatalytic Performance for Nitrogen Reduction to Ammonia

The electrocatalytic nitrogen reduction reaction (NRR) is a key approach for synthesizing green ammonia under mild conditions. However, the high bond energy of the N≡N triple bond makes N2difficult to activate, limiting the Faradaic efficiency. MoS2offers advantages such as low cost and abundant reserves as a non-precious-metal NRR electrocatalyst. Nevertheless, pure MoS2suffers from insufficient conductivity and a limited number of active sites, resulting in suboptimal catalytic performance. Herein, we develop a solvent-regulated one-step hydrothermal strategy using ethylene glycol as the sole reaction medium to fabricate an oxygen-substituted amorphous MoS2(O-MoS2) electrocatalyst. XRD, SEM, and HRTEM characterization revealed that, as the ethylene glycol ratio increased, the product gradually transformed from a layered crystalline structure to a completely amorphous structure. XPS confirmed that oxygen atoms were uniformly incorporated into the MoS2lattice via substitution doping. Electrochemical testing showed that O-MoS2achieved an ammonia yield of 97.16 μg h−1mg−1and a Faradaic efficiency of 46.44% in a 0.1 M Na2SO4electrolyte at −0.70 V vs. RHE, significantly outperforming undoped MoS2and semi-doped S-MoS2. DFT calculations indicate that O doping reduces the N2adsorption energy, thereby synergistically promoting N2adsorption and activation. This dual-modification strategy provides a facile and universal guidance for electronic structure regulation of MoS2-based catalysts and sheds new light on the design of high-efficiency ambient nitrogen fixation electrocatalysts toward practical green ammonia synthesis.

Green Solvent-Based Dispersive Liquid–Liquid Microextraction Method Coupled with High-Performance Liquid Chromatography for the Determination of Triazole Fungicides in Cereal Samples

Min Li,Yulin Wang,Huajuan Yin,Xu Jing,Yunlong Li

Triazole fungicides (TFs) are widely used in cereal production due to their potent fungicidal activity and broad-spectrum efficacy. Nonetheless, residues of TFs in food products may pose risks to food safety and human health. Therefore, the development of efficient and environmentally friendly sample preparation methods is paramount for the reliable determination of TFs. Herein, a novel green solvent-based dispersive liquid–liquid microextraction method coupled with high-performance liquid chromatography (DLLME-HPLC) was developed for the determination of TFs in cereal samples. The prepared magnetic deep eutectic solvents (MDESs), composed of nonanoic acid and ferric hydroxide, served as green, magnetically responsive extraction solvents, enabling rapid magnetic separation without centrifugation. Four bio-based solvents (BBSs) were investigated as green dispersive solvents to facilitate the dispersion of MDESs and replace conventional toxic organic dispersants, thereby further enhancing the environmental sustainability of the extraction procedure. Owing to the combined effects of hydrophobic interactions, hydrogen-bonding networks, and magnetic responsiveness, the proposed method achieved efficient extraction and rapid phase separation while minimizing solvent consumption and operational complexity. The greenness of the method was evaluated using multiple green analytical chemistry metrics, confirming its low environmental impact, reduced waste generation, and improved operational safety compared with conventional DLLME procedures. Under optimized conditions, the method was successfully applied to determine TFs in rice, wheat, corn, buckwheat, and oat samples, achieving recoveries ranging from 75.0% to 101.9% and relative standard deviations of 1.6–4.8%. The developed DLLME method provides a rapid, sensitive, and environmentally friendly strategy for cereal pesticide residue analysis and expands the application of MDESs and BBSs in green sample preparation.

Targeting microglia-mediated neuroinflammation via pH-responsive lipid nanoparticle delivery of HDAC inhibitor RGFP966 in ischemic stroke

Yaqi Liu,Biao Luo,Yun Xu,Dexiang Liu,Qiujing Wang

Ischemic stroke (IS) remains a leading cause of global disability and mortality, with limited effective anti-inflammatory interventions. Targeting histone deacetylase 3 (HDAC3) to reprogram microglial polarization holds great therapeutic promise, but the HDAC3-specific inhibitor RGFP966 suffers from poor blood-brain barrier (BBB) penetration and systemic toxicity. Herein, we developed a pH-responsive brain-targeted lipid nanoparticle (CD-TLNP@RGFP966) by integrating T7 peptide modification for BBB transcytosis and cinnamaldehyde-α-cyclodextrin (CA-αCD) encapsulation for acidic lesion-triggered drug release. CD-TLNP@RGFP966 exhibited favorable colloidal stability, biosafety, and pH-dependent release behavior. It efficiently crossed the BBB, accumulated in ischemic brain tissue, promoted microglial M2 polarization, attenuated neuroinflammation, reduced infarct volume, and improved neurological function in tMCAO mice. This study provides a novel targeted nanocarrier strategy for the anti-inflammatory treatment of IS.

Choline chloride-based deep eutectic solvent for corn straw pretreatment: enhancing biohydrogen production and elucidating underlying mechanisms

Shengming Zhang,Rui Han,Liangfei Ma,Wei Sun,Guoxiang Zheng

Hydrogen is a clean energy source with a high calorific value. Using crop straw, an agricultural by-product, for biological hydrogen production is a very promising way to convert biomass energy. This study investigated how deep eutectic solvent (DES) pretreatment altered the physical and chemical structures of corn straw and optimized key process parameters. In the DES system, choline chloride and p-toluenesulfonic acid act as hydrogen bond acceptors and donors, respectively. The performance is best at a mass-to-volume ratio of 0.06 g: 1 mL. After pretreatment, the hydrogen production reached 106.97 mL H₂/g TS, a 469.29% increase over the untreated sample. 70.98% of the lignin was effectively removed, while 86.63% of the cellulose was retained. In addition, 61.73% of the hydrogen bonds between cellulose and hemicellulose, along with 39.70% of the hydrogen bonds between cellulose and lignin, were disrupted. These chemical components and the structural changes of lignocellulose are regarded as the main factors for the increase in hydrogen production of corn straw. It is worth noting that DES maintained a stable catalytic efficiency in the fifth regeneration cycle, indicating its potential for sustainable application in biological hydrogen production.

CS-PEG-modified long-circulating tanshinone I liposomes for enhanced lipid-lowering synergy with atorvastatin and reduced adverse effects

Li Zhang,Yize Lv,Xuedi Weng,Yan Gao,Jie Gao,Xia Cao,Michael Adu-Frimpong,Qilong Wang

Chitosan-polyethylene glycol (CS-PEG)-modified long-circulating liposomes were developed and loaded with tanshinone I (TaI@CS-PEG-L) to overcome its poor solubility and low bioavailability, as well as enhance the lipid-lowering efficacy of atorvastatin (At) and mitigate its tissues toxicity. After synthesis of CS-PEG copolymer, it was characterized with infrared and proton nuclear magnetic resonance. Thin-film hydration was used to prepare TaI@CS-PEG-L before optimization was performed using Box-Behnken design. Optimal liposomal formulation was obtained when mass ratio of lecithin:cholesterol:TaI mass ratio was 12:1:1 along with 0.2% CS-PEG, which displayed appropriate particle size (117.41 nm), polydispersity index (0.182), zeta potential (+17.31 mV), encapsulation efficiency (93.15%), and drug loading (5.19%). Besides, the liposomal preparation exhibited good long-term storage stability (over 30 days at 4 °C and 25 °C) and satisfactory gastrointestinal stability in simulated gastric (pH 1.2) and intestinal (pH 6.8) fluids for 4 h. TaI@CS-PEG-L displayed increased cellular uptake and in vitro release compared with free TaI and unmodified liposomes. Regarding pharmacokinetic studies, TaI@CS-PEG-L increased AUC0-ₜ, t1/2, and Cmax in rats by 7.26-fold, 2.43-fold, and 3.12-fold, respectively, which indicates significantly enhanced oral bioavailability. TaI@CS-PEG-L monotherapy markedly lowered serum lipid levels in hyperlipidemic mice, thereby improving liver function indices, and alleviating pathological liver injury. TaI@CS-PEG-L demonstrated synergistic lipid-lowering effects and efficiently reversed At-induced hepatic and pancreatic injuries after combination with At, thus outperforming free TaI and TaI@L. Therefore, CS-PEG-modified long-circulating liposomes could efficiently address delivery challenges of TaI, thereby yielding a formulation that could potently lower serum lipid levels and protect liver against injury. The findings of this study offer a promising ‘efficacy-enhancing and toxicity-reducing’ strategy for potential treatment of hyperlipidemia in the clinics.