查找使用阿拉丁产品的科研文献

Constructing A/B-Side Heterogeneous Asynchronous Structure with Ag2Se Layers and Bushy-like PPy toward High-Performance Flexible Photo-Thermoelectric Generators

Zhen-yu Yang,Xin-zheng Jin,Chen-hui Huang,Yan-zhou Lei,Yong Wang

The enthusiasm for environmental energy harvesting has triggered a boom in research on photo-thermoelectric generators (PTEGs), and the relevant applications are mainly focused on self-energy supply sensors owing to the limitations of their output performances. For this purpose, high-output hierarchical heterogeneous PTEGs were constructed by assembling separately optimized thermoelectric (TE) and photothermal (PT) layers. The pressure and temperature conditions of Ag2Se films during the pressing process were first explored, and the sample with the optimal performance and least defects was selected as the TE layer. At the same time, different morphologies of polypyrrole (PPy) PT layers were electrochemically synthesized. It is found that the three-dimensional structure of Bushy-PPy could effectively improve the light absorption and thus enhance the PT conversion performance. The final assembled PTEG can produce an output voltage of −9.03 mV and an output power of 3.53 μW under the irradiation of a near-infrared light source of 300 mW cm–2 without a cooling source, and it can also achieve considerable output power under visible light irradiation of different intensities. Combining its high retentions of electrical conductivity (99%) and output performance (97%) after 1000 bending-tension cycles, it is proven to be a promising next-generation wearable flexible energy harvesting device.

Idarubicin-loaded methoxy poly(ethylene glycol)-b-poly(l-lactide-co-glycolide) nanoparticles for enhancing cellular uptake and promoting antileukemia activity

Bin Liang,Na Li,Shuofei Zhang,Aihua Qi,Jianhua Feng,Weiwei Jing,Changcan Shi,Zhaipu Ma,Shenmeng Gao

Effect of B-site ions on crystal structure evolution and microwave dielectric properties of scheelite-type CaW1-xMoxO4 (x = 0–0.12)

Hengji He,Dainan Zhang,Youbin Zheng,Cheng Liu,Jie Li,Qinghui Yang,Huaiwu Zhang

Herein, the influences of Mo 6+ substitution at the B-site on the sintering character, microstructures, and dielectric properties of scheelite-type CaW 1- x Mo x O 4 ( x  = 0–0.12) ceramics were studied in detail. The formation of scheelite solid solutions effectively reduced the sintering temperature of conventional CaWO4 ceramics from 1150 °C to 950 °C . Appropriate Mo substitution improved the compactness of the samples (relative density is 98.78 %), promoted grain growth, and consequently influenced their dielectric properties. At x = 0.08, the modified ceramics exhibited significantly improved dielectric properties compared to conventional CaWO 4 ceramics, with ε r ∼9.92 ± 0.05, Q ×  f ∼64848.33 ± 1459 GHz (@12.8 GHz), and τ f  ∼ −20.97 ± 1.91 ppm/°C. Furthermore, comprehensive analyses employing Piller-Van Loan (P-V-L) chemical bond theory, lattice vibration characterization analysis, and ionic polarizability evaluation demonstrated that the chemical stability of W-O bonds is the important factor governing the variations in dielectric properties of CaW 1-x Mo x O 4 ceramics. This study presents a promising candidate material for microwave device applications.

Preparation and electrochemical properties of thieno-[3,4-b] pyrazine conjugated polymer composite supercapacitor carbon powder electrode materials for Li-organic battery

Xin Yue,Jinsheng Zhao

In this work, two D-A monomers 2,3-di(5-methylfuran-2-yl)-5,7-di(thiophene-2-yl) thiopheno[3,4-b] pyrazine (MFTTP) and 2,3-di(5-methylfuran-2-yl)-5,7-di(4-methoxythiophen-2-yl) thiopheno [3,4-b] pyrazine (MFMOTTP) were first obtained by Stille Coupling reaction, and then the corresponding composites were obtained by in-situ oxidative polymerization method with supercapacitor carbon. The surface morphology, chemical structure, and the element valence states of two materials were characterized by scanning electron microscopy, infrared and XPS, respectively. The specific surface areas of PMFTTP@SC and PMFMOTTP@SC are measured as 756.5 and 954.9 m2/g, respectively. The CV curves were used to determine the initial oxidative and initial reduction potentials, both polymers have a narrow band gap with Eg values below 1.5 eV, electron clouds in the HOMO and LUMO orbits of the polymer are mainly distributed on the aromatic rings of the polymer backbone. Polymer composite materials were used as the anode materials and the lithium sheets were used as counter electrode, and then lithium ion batteries are assembled. The first discharge specific capacities of PMFTTP@SC and PMFMOTTP@SC are 741.9 and 951.3 mAh/g at a current density of 100 mA/g, and as the electrodes are activated in the subsequent cycles, their coulomb efficiencies can reach more than 92% from the third cycle. In contrast, PMFMOTTP with methoxy-thiophene as the donor unit has higher conductivity and lower corresponding impedance due to its stronger electron donating ability and abundant pore structure, which is also more conducive to the lithiation/delithiation redox process.

B and N Co-doped carbon dots for the ratiometric fluorescence detection of riboflavin and information security with room temperature phosphorescence

Na Wei,Yanan Yan,Ning Sun,Yue Huang,Yang Liu,Wenjuan Dong,Xiaojuan Gong,Jie Zhao,Ruinbing Wang,Shengmei Song,Chuan Dong

Matrix-free room temperature phosphorescence (RTP) materials have generated considerable interest in sensing, anti-counterfeiting and bioimaging due to long lifetime and large Stokes shift. However, spin-forbidden transition and non-radiative transition make RTP challenging to implement. In this work, matrix-free RTP carbon dots (CDs) co-doped with boron and nitrogen were prepared through the microwave-assisted strategy. The CDs realize RTP without any protective matrix. This may be attributed to the stable and rigid structure formed during the heating polymerization process, which can protect the triplet excited state from being quenched by oxygen and water in the air environment. The fluorescence and phosphorescence emission wavelength of the as-prepared CDs were observed at 532 nm and 596 nm with the excitation wavelength of 476 nm and 514 nm, respectively, showing a long afterglow lifetime of 735.3 ms. Nitrogen doping has a crucial effect on the luminescence of RTP, and the increase of nitrogen content facilitates the n-π* transition and improve the efficiency of intersystem crossing (ISC). Importantly, the ratiometric fluorescence method for determining riboflavin has been established based on the Förster resonance energy transfer (FRET) between the CDs (Donor) and riboflavin (Acceptor), with a linear relationship in the range of 9.52–85.71 μM and the limit of detection (LOD) of 19.9 nM. Additionally, the phosphorescent property of the CDs was exploited to demonstrate the potential applications in the field of information encryption.

Dopant-driven tuning of toluene oxidation and sulfur resistance at the B-site of LaCo1−xMxO3 (M = Fe, Cr, Cu) perovskites

Chunwang Lv,Mingjiang Hu,Tianhao Yuan,Liqiang Yan,Hongwei Chen

The objective of this work was to investigate and contrast the mechanism of different B-site dopants for catalytic activity and sulfur resistance under equivalent conditions. LaCo1−xMxO3 (M = Fe, Cr, Cu) perovskite-type catalysts were synthesized by a sol–gel method, and the optimized samples were tested for toluene oxidation before and after sulfur aging. The properties of the catalysts were investigated in detail by XRD, FT-IR, N2 adsorption–desorption, H2-TPR, XPS and in situ DRIFTS to elucidate the inner mechanisms of the catalytic reaction and poisoning processes. The results indicated that introducing specific metal cations with a suitable ratio into the B-site of perovskite could improve the catalytic activity and weaken the negative effect of SO2 poisoning. The reasons for the improvement of catalytic activity on different doped catalysts are similar and mainly lie in the change of reduction property, oxidation state of the B-site, and content of oxygen vacancies. However, the mechanism of sulfur resistance caused by different dopants is not identical. The introduction of different metal cations will cause certain differences in some factors such as reducibility, lattice stability, sulfur adsorption and sulfate content, thus leading to the differentiation of sulfur tolerance for doped perovskite catalysts. In this study, the optimization effect of Fe dopant is better than that of Cr and Cu dopants, illustrating that the high stability of the perovskite lattice and the insensitivity to sulfur species are the key factors for its outstanding sulfur resistance. The results provide insights into guiding the practical composition and life cycle optimization of perovskite-type catalysts in the industrial application of removing sulfur-containing VOCs.

Nonfullerene acceptors from thieno[3,2-b]thiophene-fused naphthalene donor core with six-member-ring connection for efficient organic solar cells

Siying Du,Nannan Yao,Shungang Liu,Yongzhuo Xu,Jiamin Cao,Wenliu Zhuang,Junting Yu,Nong Wang,Donghong Yu,Fengling Zhang,Ergang Wang

Comprehensive design ideas on the fused-ring donor-core in state-of-the-art acceptor-donor-acceptor (A-D-A) nonfullerene acceptors (NFAs) are still of great importance for regulating the electron push-pull effect for the sake of optimal light-harvesting, frontier molecular orbital levels, and finally their photovoltaic properties. Herein, thieno[3,2- b ]thiophenes were fused in bay-area of naphthalene via six-member-ring connection, resulting in the formation of dihydropyrenobisthieno[3,2- b ]thiophene based octacyclic ladder-type donor core, which was flanked by two 1,1-dicyanomethylene-3-indanone (IC) acceptor motifs with and without 5,6-diflourination, namely PTT-IC and PTT-2FIC , respectively, as novel efficient A-D-A fused-ring electron acceptors (FREAs). Compared with PTT-IC , fluorinated PTT-2FIC possesses narrower optical bandgap of 1.48 eV, better π-π stacking, and its PBDB-T: PTT-2FIC blend film exhibited better morphology, and better hole and electron mobility . As a result, nonfullerene solar cells using PBDB-T: PTT-2FIC as the active layer achieved a decent PCE of 10.40%, with an open-circuit voltage ( V OC ) of 0.87 V, a fill factor (FF) of 0.65, and a much higher short-circuit current ( J SC ) of 18.26 mA/cm 2 . Meanwhile, the PBDB-T: PTT-IC cells delivered a lower J SC of 12.58 mA/cm 2 but a higher V OC of 0.99 V, thus resulting in a PCE of 7.39% due to its wider optical bandgap of 1.58 eV and higher LUMO energy level. These results demonstrated that NFAs based on fused-ring donor core from fusing thieno[3,2- b ]thiophenes with naphthalene via six-member-ring connection are promising for organic photovoltaic applications.

Bio-based poly(butylene 2,5-furandicarboxylate)-b-poly(ethylene glycol) copolymers with adjustable degradation rate and mechanical properties: Synthesis and characterization

Han Hu,Ruoyu Zhang,Andreia Sousa,Yu Long,Wu Bin Ying,Jinggang Wang,Jin Zhu

Bio-based poly(butylene furandicarboxylate)-b-poly(ethylene glycol) copolymers are successfully synthesized through transesterification and melt polycondensation. The resulted polymers are characterized in terms of structural, thermal and mechanical properties. In addition, for the first time relevant hydrolytic degradation studies for the copolymers applications are systematically conducted in neutral and alkaline conditions. The PEG weight fraction ranges from 10% to 60%, as determined by 1 H NMR. Isothermal crystallization tests show that the copolymers own faster crystallization rate than that of PBF, with melting temperature higher than 120 °C. Water contact angle and water uptake characterizations show that the introduction of increasing amounts of PEG improves the hydrophilic character of the copolymers. Tensile tests clearly indicate that elongation at break drastically increase with PEG content, up to 5 times compared to PBF. From the Notched Izod impact tests, most samples are unbroken in the impact testing, showing excellent impact toughness. It is surprising to find that after water uptake, the PBF-PEGs still have acceptable mechanical properties. The weight loss during hydrolytic degradation is significant after 5 weeks for most of copolymers. With fast hydrolytic degradation rate and good mechanical properties, these copolymers own potential applications in areas like biomedical industry.

Colloidal gold-based immunochromatographic assay for β-lactoglobulin variants a and B in dairy products and insights into antibody recognition mechanisms

Jialin Hu,Lingling Guo,Xinxin Xu,Hua Kuang,Liguang Xu,Liqiang Liu,Chuanlai Xu,Hongyu Zhang,Maozhong Sun

Food fraud practices, such as milk adulteration, exacerbate allergy risks by introducing undeclared allergens, primarily β-lactoglobulin (β-Lg). Therefore, the effective detection of β-Lg in food is crucial for ensuring consumer safety. In this study, we screened hybridoma cell lines 11F10 and 4G1, which recognized β-Lg variants A (β-Lg A) and B (β-Lg B). Genes of these hybridoma cell lines were extracted, amplified, and cloned into expression vectors to produce recombinant antibodies (rAbs). Using rAbs 11F10 and 4G1, colloidal gold-based immunochromatographic strips were developed for detecting β-Lg A and B in dairy products. The strips exhibited a visual limit of detection of 200 μg/kg in cheese and amino acid formulas, and 200 ng/mL in raw milk. The results of molecular docking indicated that the critical amino acid residues for 11F10 were Asp57, Tyr32, and Arg49, whereas those for 4G1 included Tyr101, Tyr106, and Tyr49.

Core-shell Prussian blue analogues@ poly(m-phenylenediamine) as efficient peroxymonosulfate activators for degradation of Rhodamine B with reduced metal leaching

Liang Zeng,Ling Xiao,Xiaowen Shi,Mingyu Wei,Jinying Cao,Yangke Long

Herein, Prussian blue analogues@poly(m-phenylenediamine) nanoparticles (PBA@PmPDs) with well-defined core-shell structure were synthesized. The successful coating of poly(m-phenylenediamine) (PmPD) on the surface of Fe y Co 3-y [Co(CN) 6 ] 2 (Fe-Co-Co PBA) was confirmed by SEM, TEM , XRD , TGA , FT-IR and XPS . The catalytic performance of Fe-Co-Co PBA@PmPDs was evaluated by activation of peroxymonosulfate (PMS) for degradation of Rhodamine B (RhB), the effects of different influence factors on the RhB degradation efficiency were investigated, including PMS concentration, temperature, initial solution pH, and co-existing inorganic salts. Cobalt ions leaching and stability of the catalysts were studied, Co ions concentration dissolved into the solution from the solid catalysts at 60 min is reduced by half after the Fe-Co-Co PBA is coated with PmPDs. The RhB removal efficiency is higher than 90% even after four cycles and the nanoparticles still maintain the core-shell structure, indicating that Fe-Co-Co PBA@PmPDs is stabile and reusable. Radical quenching experiments and electron paramagnetic resonance spectra indicate that both SO 4 − and OH are generated during the PMS activation process and SO 4 − is the dominant reactive species. In virtue of its superior catalytic activity, excellent reusability and stability, low metallic ion leaching, Fe-Co-Co PBA@PmPDs could be a promising catalyst for the remediation of contaminated water.

Achieving ultrahigh strain in lead-free piezoelectric ceramics of Bi0.5(Na0.41K0.09)TiO3-(Ba0.5Sr0.5)HfO3 via A/B-site co-doping strategy

Qian Qiu,Yanghao Xu,Xinyu Liu,Haikui Song,Yuan Zhou,Zeyu Lv,Shaofei Zhang,Jinfeng Sun,Hongliang Du,Gang Liu,Yan Yan

BNT-based piezoelectric ceramics have garnered considerable attention owing to their potential to exhibit large electrostrain. However, irreversible phase transitions and domain structure alterations lead to limited effective strain and poor temperature stability, which restricts their application in high-precision displacement devices, representing a major bottleneck in current research. In this study, 0.82Bi 0.5 Na 0.5 TiO 3 –0.18Bi 0.5 K 0.5 TiO 3 (BNKT) was selected as the base composition, and an A/B-site co-doping strategy was employed to develop a (Ba 0.5 Sr 0.5 )HfO 3 (BSH) composite modification system. By precisely adjusting the BSH doping concentration ( x  = 0–0.03), the ferroelectric – relaxor phase transition temperature ( T F-R ) was effectively shifted to below room temperature, thereby significantly lowering the field-induced phase transition energy barrier. Finally, the BNKT-0.02BSH ceramic exhibits a high piezoelectric strain coefficient ( d 33 ∗) of 648 pm/V under an electric field of 65 kV/cm, along with a strain response of 0.475 % at 80 kV/cm. Meanwhile, the strain stability remains above 85 % over the temperature range of 30–100 °C. Multi-scale characterization techniques, including X-ray diffraction and temperature-dependent Raman spectroscopy, confirmed that the improved performance enhancement is attributed to BSH modification, which increases local structural heterogeneity and significantly promotes electric field-induced reversible phase transitions between the relaxor to ferroelectric states. This study offers novel insights into the understanding of the composition-structure-property relationship.

Tuning the morphology and surface structure of MnOx@GF through Ce for high-efficiency degradation of Rhodamine B by electro-Fenton

Xiaocong Liu,Yi Wang,Fuping Zhang,Bo Xing,Guo Yang,Kaibin Zhang,Xingyong Liu,Yan Huang,Min Li,Mingliang Wu

Widespread and ineffective dye treatment in aquatic environment leads to serious pollution problems, threatening ecology and human health. Herein, manganese cerium bimetallic oxide cathode material (MnCeO x @GF) was prepared by hydrothermal method combined with calcination, and the electrochemical Fenton degradation performance of a typical dye Rhodamine B (Rh B) was investigated. The results show that the degradation of Rh B by MnCeO x @GF can reach 96.5 % within 2 h in acidic environment and continue to perform effectively after 4 repeated experiments. Combined with SEM and electrochemical test results, it can be seen that the bimetallic composite oxides formed by manganese and cerium on the surface of the support can effectively enhance the catalytic activity of the material, the addition of cerium changes the morphology of manganese oxides and promotes the generation of multiple valence composite oxides of transition metals, and improves the degradation of Rh B. Based on the free radical masking experiments, hydroxyl radical (·OH) is the main active substance in the electro-Fenton degradation process. This work not only provides a way to design and manufacture cathode materials for in situ electrosynthesis of H 2 O 2 , but also provides an important reference for improving the reusability of cathodes for sustainable dye wastewater treatment.