查找使用阿拉丁产品的科研文献

Ultrathin scintillators enabled via rapidly growing large-area 2D lanthanide oxychloride doped with Eu3+/Tb3+ for X-ray imaging

Hao Chen,Liang Li,Xuefang Lu,Shunze Huang,Man Xia,Jianzhong Xu,Xiwei Lai,Zewenhui Zhang,Xin Qian,Tianyu Xu,Feng Huang,Richeng Lin

Ultrathin scintillators are key components of high-spatial-resolution X-ray detectors in medical imaging, high-precision nondestructive inspection, and high-energy physics. Currently, the spatial resolution of X-ray imaging detector generally is enabled by high-light-yield scintillators with minimal optical scattering. However, suppressing optical scattering losses typically require the scintillation layers thinner than a few tens of micrometers, which is difficult to obtain through conventional top-down mechanical thinning. Here, a bottom-up method that rapidly growing inch-sized, Eu 3+ /Tb 3+ doped lanthanide oxychloride (LaOCl) films via chemical vapor deposition (CVD) is proposed to obtain large-area ultrathin scintillators. The doping Eu 3+ /Tb 3+ ions act as luminescent activators and provide strong red and green scintillation through efficient f-f intra-configurational transitions, which are shielded from the host lattice by the outer 5s 2 5p 6 electron shells, resulting in sharp emission lines and high quantum efficiency. The layered crystal structure of LaOCl further facilitates anisotropic growth, enabling precise control of film thickness from a few atomic layers up to the micrometer scale. The growing LaOCl:Eu 3+ film with thickness of approximately 30 μm shows a photoluminescence quantum yield (PLQY) of 99.3%, and demonstrating an ultralow X-ray dose-rate detection limit of 143.41 nGy s −1 , owing to efficient energy transfer from the LaOCl host to the activator ions. Furthermore, the growing LaOCl:Eu 3+ /Tb 3+ films exhibit excellent linear response and radiation hardness under X-ray exposure, retaining above 95% of their initial intensity after prolonged cyclic irradiation at 27.8 μGy s −1 for 24,000 s. These results demonstrate CVD-grown LaOCl:Ln films as a promising platform for high-resolution and low-dose X-ray imaging detection. An ultrathin scintillator film is fabricated via an unconventional bottom-up chemical vapor deposition–driven evaporation growth method. The oriented attachment and layer-by-layer stacking of LaOCl:Ln 3+ crystal nuclei enables the fabrication of centimeter-scale ultrathin films with controllable thickness. The doping Eu 3+ and Tb 3+ act as luminescent activators, generating intense red and green emissions through efficient 4f-4f intra-configurational transitions. Owing to the effective shielding of the outer 5s 2 5p 6 electron shells, these transitions exhibit sharp emission lines and exceptionally high quantum efficiency. For LaOCl:Eu 3+ films with a thickness of approximately 30 μm, the photoluminescence quantum yields achieves a near unit of 99.3%, demonstrating an ultralow X-ray detection limits of 143.41 nGy s −1 and outstanding radiation stability. Download: Download high-res image (333KB) Download: Download full-size image

A colorimetric sensor for sensitive and highly selective detection of butyl hydroxyanisole in edible oil based on dual-enzyme-mimic activities of Ag2CO3 nanozymes

Zhongqin Li,Jiazhen Shi,Yinghua Song,Yue Tang,Lian Xia,Yuangen Wu

Butylated hydroxyanisole (BHA) is a synthetic phenolic antioxidant widely used in edible oils and fat-containing foods. Excessive BHA poses significant risks to human health, thus making rapid and sensitive detection of BHA crucial for health protection. Herein, the Ag 2 CO 3 nanozyme was prepared by the simple precipitation method, which exhibits both laccase-mimic and oxidase-mimic activities. It was found that the oxidase-mimic activity of Ag 2 CO 3 facilitated the conversion of TMB to its blue oxidized form (oxTMB), and subsequent addition of BHA resulted in the formation of a characteristic purple adduct. Additionally, BHA effectively suppressed the laccase-mimic activity of the Ag 2 CO 3 nanozymes. Therefore, a novel colorimetric sensor was constructed using the dual-enzyme-mimic activities as a sensing signal for rapidly detecting BHA in edible oil. The colorimetric sensor achieves limits of detection (LOD) for BHA as low as 1.1 μM in the laccase-mimic channel and 0.08 mM in the oxidase-mimic channel, both of which are substantially lower than the maximum permissible BHA level in edible oils stipulated in Chinese National Food Safety Standard GB 2760. The sensor developed in this work shows great promise for application in the field of edible oil detection.

Tailoring interlayer/interedge ion channels of graphene oxide membranes via a reduction-assisted alkali/alkaline earth cation-anchored strategy

Lingfeng Liu,Junhui Zhou,Ziqi Cao,Miaolin Chen,Jincheng Cai,Qingjiang Feng,Yuhan Chen,Jianbo Jia,Mengchen Zhang

Membrane-based mono/divalent ions sieving is pivotal for enhancing sustainable development across various fields related to resource extraction, environmental preservation and energy conversion. Two-dimensional (2D) laminar membranes are emerging as promising candidates for high-precision ion separation, where selective ion transport occurs either along the plane (interlayer) or through the plane (interedge). Herein, we propose a reduction-assisted cation-anchored strategy for tailoring both interlayer and interedge ion channels in 2D graphene oxide (GO) membranes. By rational immobilization of a series of semi-dehydrated cations, the GO interplanar interactions and architectures are elaborately manipulated. Characterizations and simulations unveil that alkali cations (K + , Na + , Li + ) and alkaline earth cations (Mg 2+ , Ca 2+ , Ba 2+ ) tend to anchor at interlayer and interedge regions of GO through cation-π and coordination interactions, enabling the angstrom-level size control over the GO interlayer spacings (from 4.4 to 4.6 Å) and the edge-to-edge distances (from 4.1 to 5.8 Å), respectively. By leveraging the synergy of dual-channel co-regulation, the Li + &Ca 2+ -co-anchored reduced GO (Li + &Ca 2+ -rGO) membrane exhibited an extraordinary discrimination ability towards mono/divalent ions. Our findings elucidate the semi-dehydration binding mechanisms of alkali and alkaline earth cations within GO membranes, and highlight their critical roles in angstrom-scale fine-tuning of interlayer and interedge ion channels, paving the way for the development of 2D laminar membranes for precise ion separation applications.

Highly sensitive detection of trace dopamine in pork products using poly(aniline-co-3-aminophenylboronic acid)-based electrochemical sensor

Zhuo Shi,Hongyuan Guo,Xiaoyang Fu,Xiayu Song,Xiu Zhao,Suozhu Wu

Poly(ANI-APBA) composite was prepared by one-step electrochemical deposition. • DA was detected via boronic acid-diol recognition. • An ultra-wide response range (1.00 × 10 −11  M to 1.00 × 10 −4  M) was obtained. • An ultra-low detection limit (2.41 × 10 −12  M) was obtained. • This sensor was simple, stable, accurate, and highly selective. Dopamine is a crucial neurotransmitter, and the misuse of exogenous dopamine may lead to its residues in animal-derived food products, thereby posing potential risks to human health. In this work, an electrochemical sensor was developed for dopamine detection by integrating the highly conductive framework of polyaniline with poly(3-aminophenylboronic acid) having ortho-diol recognition capability. Initially, a poly(aniline- co -3-aminophenylboronic acid) modified electrode was fabricated through the copolymerization of aniline and 3-aminophenylboronic acid. Subsequently, sensitive detection of dopamine was achieved by monitoring the signal of the potassium ferricyanide probe. The results demonstrated that this electrochemical sensor had a wide linear response range (1.00 × 10 −11  M to 1.00 × 10 −4  M) toward dopamine with a detection limit as low as 2.41 × 10 −12  M. The proposed sensor exhibited superb reproducibility, excellent stability, and high selectivity. This study provided a more efficient analytical approach for sensitive determination of dopamine content in pork products. Download: Download high-res image (213KB) Download: Download full-size image

Topotactic transformation and molten salt electrodeposition: Upcycling spent catalysts into platinum nanospheres

Dengjie Yan,Guoqing Zhang,Bingyi Song,Baoqiang Xu,Bin Yang,Lingxin Kong

Spent catalysts are vital platinum resources yet hazardous wastes, threatening irreversible environmental harm if mishandled. This study introduces a strategy for upcycling platinum from spent catalysts into nanospheres. Demonstrated using a simulated system and validated with a real spent catalyst, the designed Pt→Li 2 Pt→Li 2 PtO 3 pathway enables the topotactic conversion of Li 2 Pt to Li 2 PtO 3 via oxygen intercalation, thereby reconstructing the electronic structure of platinum. Zintl-phase Li 2 Pt intermediate enhanced the oxidation kinetics. Li 2 PtO 3 stabilized platinum in the +4 state and facilitated its dissolution in the molten salt. Preferential Li + dissolution triggered lattice destabilization and the release of Pt 4+ . Pt 4+ coordination evolved from O 2− to Cl − -dominated soluble complexes through mixed-coordination intermediates like [PtOCl y ] (y− 2 )− . Electrochemical analysis confirmed a two-step reduction mechanism, which suppressed explosive nucleation and dendritic growth. Electrodeposition at 1.0 V produced uniform platinum nanospheres. This study develops a clean and efficient upcycling strategy for spent catalysts, which provides a viable solution for the sustainable utilization of strategic metal resources.

Preparation of nitrogen-doped biochar with different potassium sources and its CO2 adsorption performance

Haifei Wang,Wei Tian,Yunlong Tian,Zhiqiang Han,Chengzhuang Zhang,Kun Liang,Gebrehiwot Gebreslassie,Denggui Wang,Jia Fang

Nitrogen-doped biochars are prepared from corn stalk using different potassium salts (KOH, KHCO 3 , K 2 CO 3 , and potassium citrate) as activators, followed by KCl-assisted modification. Among all samples, PB2 (K 2 CO 3 /KCl co-activated) shows the highest CO 2 uptake of 4.28 mmol/g at 25 °C and 1 bar. This improved performance is attributed to the combined effects of abundant ultramicropores and narrow micropores, particularly pores below 0.6 nm, together with abundant surface functional groups, including graphitic nitrogen and C-N/C-O species. The micropores provide a high density of adsorption sites, which promotes efficient pore filling. Meanwhile, the nitrogen and oxygen functionalities enhance CO 2 affinity by modulating the electronic properties and increasing surface polarity. Cyclic stability is evaluated by thermogravimetric analysis (40 °C, atmospheric pressure). PB2 exhibits an initial CO 2 adsorption capacity of 2.05 mmol/g, which decreases to 1.69 mmol/g after five adsorption-desorption cycles, corresponding to a capacity retention of 82.44%. Although this cyclic performance is lower than those of PB, PB1, and PB3, PB2 combines the highest single-point CO 2 uptake with acceptable cyclic stability. This result indicates a trade-off between adsorption capacity and cycling stability. Overall, the results demonstrate that both pore structure and surface chemistry are critical to CO 2 adsorption performance. Among all samples, PB2 exhibits the most favorable combination of these characteristics.

Iron-derived solid redox system for effective and sustainable sulfur recovery from sulfide-bearing wastewater

Ren Daheng,He Wenke,Ba Xuchen,Cen Yongxian,Yuan Shuaikang,Zuo Zhiqiang,Zhang Guijiao,Xu Jiamin,Zhang Na,Wang Aijie,Cheng Hao-Yi

Elemental sulfur recovery from sulfide-bearing wastewaters presents a promising strategy for achieving both a sustainable elemental sulfur supply and pollutant removal. However, existing methods face low efficiency or heavy chemical usage, limiting their practicality. Here, we report an iron-derived solid redox sulfur recovery system, capable of efficiently converting sulfides to elemental sulfur and separating elemental sulfur from the iron catalysts (ferrihydrite) via simple gravity-based methods. Using iron-derived solid redox system, we achieve a record sulfide removal rate of 102.9 ± 3.1 kg m −3 d −1 with an elemental sulfur selectivity of 93.5 ± 0.9%. The produced elemental sulfur is then efficiently separated from the solid mixture through a hydraulic sorting process, attaining 97.7 ± 0.2% purity. Mechanistic analysis identifies the iron and sulfur species governing the solid redox process and elucidates that the separation behavior of elemental sulfur is likely a result of surface-state-dependent elemental sulfur agglomeration and repulsion between elemental sulfur and iron flocs. Moreover, we verify the effectiveness of iron-derived solid redox system in recovering elemental sulfur from two real wastewaters and estimate the economic benefits of elemental sulfur recovery to exceed 180 United States dollars per ton. This work suggests a practical approach to enable sulfide-bearing wastewaters as a sustainable source for elemental sulfur supply efficiently and cost-effectively.

A green organic depressant for chalcopyrite and galena flotation separation: application and mechanism of levodopa

Jingyu Yang,Maolong Zhang,Songlin Chen,Guang Han,Qicheng Feng

L-dopa was used as a green depressant for chalcopyrite/galena separation. • Galena was selectively depressed while chalcopyrite maintained high floatability. • L-dopa preferentially increased galena hydrophilicity and blocked collector adsorption. • L-dopa selectively interacted with the galena surface via strong chemisorption. • L-dopa anchored to active surface Pb sites by forming stable Pb–O bonds. Flotation separation of chalcopyrite and galena is challenging due to their similar surface physicochemical properties. This study investigated levodopa (L-dopa) as an eco-friendly and selective depressant for this Cu–Pb sulfide system. The depression mechanism was evaluated using micro-flotation, contact angle, Zeta potential, XPS, AFM, ToF-SIMS, and DFT calculations. Flotation results showed that under low-alkaline conditions with 5 × 10 −4 mol/L L-dopa, galena recovery decreased to 2.99% while chalcopyrite recovery remained above 90%. Artificially mixed-mineral flotation successfully separated galena and chalcopyrite, yielding a copper concentrate with over 30% Cu grade and 85% recovery. Surface analysis revealed that L-dopa preferentially adsorbed onto galena, enhancing its hydrophilicity and blocking xanthate collector adsorption, whereas its impact on chalcopyrite was minimal. DFT calculations confirmed that L-dopa bound to Pb sites via its carboxyl oxygen atoms to form stable Pb–O bonds. The interaction energy on galena reached –196.83 kJ/mol, indicating a strong chemisorption process. These findings demonstrate that L-dopa functions as a highly effective, selective depressant for galena, elucidating its potential for the clean separation of Cu–Pb sulfide minerals. Download: Download high-res image (160KB) Download: Download full-size image

NBR1-mediated autophagic degradation of YTHDF1 curtails FDX1 translation to drive concurrent multikinase inhibitor resistance and cuproptosis tolerance

Weikai Wang,Xin Jiang,Xiaona Chen,Kaiyu Liang,Miaoqin Chen,Kaizhong Lu,Qi Wei,Yuchen Wu,Liyuan Zhu,Yuan Chen,Tianlun Hou,Jingfeng Luo,Chentao Li,Xian Wang,Hongchuan Jin,Lifeng Feng

Tailoring Ionization of Hyper-Cross-Linked Hydrogels for Solar-Driven Crystallization of Ultrahigh-Salinity Brines

Gao Hao,Zhang Caiyan,Chen Ruini,Lu Bing,Zhao Fei

Desalination technologies inevitably generate concentrated brine, the treatment of which remains a major bottleneck to the implementation of zero-liquid-discharge systems. Evaporative crystallization offers a direct route to complete salt recovery, but it is intrinsically energy-intensive and becomes increasingly inefficient at high salinity because of the diminished evaporation driving force. Photothermal interfacial evaporation improves solar energy utilization, but salt accumulation and crystallization at the evaporation interface inevitably degrade operational stability in high-salinity systems. Here, we introduce a hydrogen-bond-enhanced ionization of cross-linking points (HIC) strategy in a hyper-cross-linked hydrogel membrane to decouple the crystallization interface from the photothermal evaporation interface. The HIC-gel membrane, constructed from sodium carboxymethylcellulose and hydroxyethyl cellulose, contains densely hydrogen-bonded microcavities with regulated cross-linking distances. Cooperative ionization within these microcavities induces counterion condensation and a self-limiting ion-blocking effect while preserving rapid water transport through the hydrogen-bond network. This selective ion regulation suppresses salt crystallization at the evaporation surface, enabling continuous solar-driven crystallization of saturated brine. The HIC-gel membrane-enabled crystallizer operates stably for more than 10 days without regeneration or maintenance in a natural outdoor environment, delivering an average daily salt yield of 2.8 kg m –2 . The HIC design enables separation of crystallization from evaporation, providing a route toward durable solar-driven terminal brine management for ultrahigh-salinity brine crystallization.

Simple and Sensitive Method to Assay STAT3 mRNA Triggered by the Self-Assembly of a Three-Way Junction Structure Signal Amplification System

Chao Murilege,He Miao,Cai Yongliang,Yin Feifan,Chen Jinhua,Pan Han,Cheng Wenting,Wang Zhongyun,Xiang Yang

Obesity is a major global health concern that substantially increases the risk of metabolic disorders. Signal Transducer and Activator of Transcription 3 (STAT3) plays a pivotal role in the progression of obesity by promoting the whitening of brown adipose tissue. In this study, a novel and highly sensitive strategy for STAT3 mRNA detection was developed by integrating three-way junction (3WJ)-mediated strand displacement amplification (SDA) with rolling circle amplification (RCA). The 3WJ structure enables specific target recognition through a proximity effect, enabling accurate discrimination of STAT3 mRNA and triggering primary signal amplification via SDA. The resulting SDA products serve as primers to initiate RCA, achieving secondary signal amplification while eliminating the need for exogenous primers and effectively reducing background signals. This method enables femtomolar (fM)-level detection of target mRNA and exhibits excellent selectivity and stability in complex biological matrices. Overall, the proposed strategy provides a reliable analytical platform for sensitive STAT3 mRNA analysis and broadens its potential applications in obesity research.

Selective separation of chalcopyrite from talc using emodin as a green depressant: Experimental and DFT insights

Hang Zhu,Haiyang He,Peilun Shen,Dianwen Liu,Guohui Wang,Haoxiang Wang,Yongchao Miao

Emodin (EM) was innovatively employed as a selective depressant for the flotation separation of chalcopyrite from talc. • EM exhibited significantly stronger adsorption on talc than on chalcopyrite. • EM selectively hindered PAX adsorption on talc while scarcely affecting chalcopyrite. • EM formed stronger Mg–O interactions on talc than Fe–O interactions on chalcopyrite. Talc and chalcopyrite both exhibit inherently high floatability, making their selective flotation separation particularly challenging. Therefore, the development of environmentally friendly depressants with high selectivity is essential for the efficient utilization of copper resources. In this study, the natural product emodin (EM) was employed as a novel green depressant for the flotation separation of chalcopyrite from talc. Under the optimum flotation conditions, EM effectively depressed talc flotation while exerting only limited influence on chalcopyrite, resulting in a recovery difference of 85.01 %age points between the two minerals. Artificial mixed-mineral flotation further confirmed the excellent separation performance, achieving a chalcopyrite recovery of 98.14% and a copper separation efficiency of 94.49%. Contact angle and zeta potential analyses demonstrated that EM effectively depressed talc flotation while exerting a limited influence on chalcopyrite flotation under potassium amyl xanthate (PAX) conditions. Microcalorimetry, XPS, and density functional theory (DFT) calculations further revealed that EM exhibited a much stronger affinity toward talc, preferentially forming stable Mg–O interactions with Mg active sites, whereas only relatively weaker Fe–O interactions were established on chalcopyrite. Collectively, these findings elucidate the molecular-level selective depression mechanism of EM toward talc, providing a theoretical basis for the efficient flotation separation of chalcopyrite from talc and the development of environmentally friendly flotation depressants. Download: Download high-res image (206KB) Download: Download full-size image