查找使用阿拉丁产品的科研文献

Quasi-static compressive and cyclic dynamic impact performances of vat photopolymerization 3D printed Al2O3 triply periodic minimal surface scaffolds and Al2O3/Al hybrid structures: Effects of cell size

Junjie Lu,Xueqin Zhang,Suwen Li,Lu Zhang,Wenqing Wang,Zengchan Li,Yanpeng Zhang,Gang Wang,Ying Li,Rujie He

In this study, Al 2 O 3 triply periodic minimal surface (TPMS) scaffolds with cell sizes of 5 mm, 8.5 mm, and 12 mm were prepared by vat photopolymerization 3D printing , and Al 2 O 3 /Al ceramic-metal hybrid structures were subsequently obtained by the metal infiltration of AlSi10Mg. To investigate the influence of cell size on the mechanical properties of vat photopolymerization 3D printed Al 2 O 3 TPMS scaffolds and Al 2 O 3 /Al hybrid structures, quasi-static compression and dynamic impact experiments were conducted, and the failure modes during experiments were discussed. It was shown that the quasi-static compression and dynamic impact properties of Al 2 O 3 TPMS scaffolds gradually decreased with the increase in cell size, the compression strength decreased from 15.2 MPa to 8 MPa and the impact strength decreased from 37 MPa to 11 MPa, respectively, which was related to the stress transfer ability of the single cell. In contrast, the effects of cell size on the performance of Al 2 O 3 /Al hybrid structures were opposite. When the cell size increased, the quasi-static compression performances of the Al 2 O 3 /Al hybrid structure were greatly improved, and the compression strength increased from 175 MPa to 250 MPa. The impact resistances of the Al 2 O 3 /Al hybrid structure were further studied. The highest impact strength of the Al 2 O 3 /Al hybrid structure was 290.74 MPa. With the increase in cell size, the impact resistance of the Al 2 O 3 /Al hybrid structure had a gradual improvement trend. Under the cyclic impact, the Al 2 O 3 /Al hybrid structure showed a high impact strength and energy absorption capacity, which was mainly related to the metal phase content around the cell, i.e., the coherence of the metal phase. This study is believed to give help for the structural design of ceramic scaffolds and ceramic-metal hybrid structures.

A Comparative Study of Gas-phase Fluorination and Nano-Al2O3 Doping on Space Charge Behavior and Trap Level in Epoxy Resin

Zijia Shen,Feipeng Wang,Muhammad Zeeshan Khan,Zhengyong Huang,Li He,Yushuang He,Jian Li

Application of micro-impinging stream reactors in the preparation of Co and Al co-doped Ni(OH)2 nanocomposites for supercapacitors and their modification with reduced graphene oxide

Renjie Gu,Xuelei Li,Kunpeng Cheng,Lixiong Wen

A micro-impinging stream reactor (MISR) consisting of a commercial T-junction and steel capillaries, which is of intensified micromixing efficiency as compared with traditional stirred reactors (STR), was applied for the preparation of Co and Al co-doped Ni(OH)2 nanocomposites and their modification with reduced graphene oxide (RGO). The co-precipitation preparation process was conducted under precisely controlled proportions and concentrations of reactants in the MISR. Therefore, element analysis showed a higher uniform distribution of metal ions within the nanocomposites obtained through the MISR. The structural characterization and electrochemical measurements also showed that the MISR-prepared metal-doped nanocomposites were of more uniform dispersion and superior electrochemical performance than those prepared with STR. In addition, by modifying with RGO in the MISR, the electrochemical performance of Co and Al co-doped Ni(OH)2 nanocomposites could be further improved. The Co and Al co-doped Ni(OH)2/RGO prepared under optimal conditions achieved an ultrahigh specific capacitance of 2389.5 F g−1 at the current density of 1 A g−1 and displayed an excellent cycling stability with 83.7% retention of the initial capacitance after 1000 charge/discharge cycles in 6 M KOH aqueous solution.

Visible-light photo-Fenton oxidation of phenol with rGO-α-FeOOH supported on Al-doped mesoporous silica (MCM-41) at neutral pH: Performance and optimization of the catalyst

Ying Wang,Mingxing Liang,Jiasheng Fang,Jun Fu,Xiaochun Chen

In this study, α-FeOOH on reduced graphene oxide (rGO-α-FeOOH) supported on an Al-doped MCM-41 catalyst (RFAM) was optimized for the visible-light photo-Fenton oxidation of phenol at neutral pH. The stability of the catalysts, effect of bubbling aeration, and degradation intermediates were investigated. Results indicated that RFAM with a large Brunauer-Emmett-Teller (BET) area and mesoporous structure displayed excellent catalytic activity for the visible-light-driven (VLD) photo-Fenton process. Phenol degradation was well described by a pseudo-first-order reaction kinetics model. Raman analysis demonstrated that an rGO-α-FeOOH (RF) composite is formed during the ferrous-ion-induced self-assembly process. Al-MCM-41 could uniformly disperse RF nanosheets and promote the mobility and diffusion of matter. The activity of the main catalyst α-FeOOH was enhanced after the incorporation of rGO nanosheets. The α-FeOOH crystal in RFAM showed catalytic activity superior to those of Fe 3 O 4 and Fe 2 O 3 . The RFAM catalyst, with an optimal GO-Fe 2+ mass ratio of 2.33, exhibited a larger BET area, pore size, and pore volume, and thus exhibited high performance and energy utilization efficiency in the VLD photo-Fenton reaction with remarkable stability. Bubbling N 2 inhibited catalytic performance, while bubbling O 2 or air only slightly accelerated the phenol degradation. Visible light played an important role in accelerating the formation of reactive oxygen species (·OH) for the highly efficient phenol degradation. Analysis of degradation intermediates indicated a high phenol mineralization level and the formation of low-molecular-weight organic acids. This work would be helpful in providing an insight into a new type of catalyst assembly and a possible route to a promising heterogeneous catalyst applicable in the visible light photo-Fenton process for effective wastewater remediation at neutral pH.

From BaAlBO3F2 to BaAlB3O6F2 and BaAl2(B3O6)2F2: the enhancement of birefringence and band gap by extending the π-conjugated system combined with [Al–O/F] functional groups

Cheng Chen,Danyang Dou,Yunjie Bai,Bingbing Zhang,Ying Wang

The investigation of birefringent materials is predominantly focused on π-conjugated systems; however, a large band gap or deep ultraviolet (DUV) transmittance cannot be guaranteed. In this work, we propose an extended π-conjugated strategy to increase the birefringence while keeping the large band gap. In the scheme, two new fluoroaluminoborates, BaAlB3O6F2 and BaAl2(B3O6)2F2, are synthesized by combining the [BO3] group with the [AlO4F2] group and the [B3O6] group with the [AlO3F] group through a rational structural design. The experimental results indicate that both BaAlB3O6F2 and BaAl2(B3O6)2F2 exhibit shorter UV cutoff wavelengths (<200 nm) and larger birefringence (Δn > 0.07@546 nm). Notably, this is a new finding in the Ba–Al–B–O–F system since the discovery of the well-known nonlinear optical crystal BaAlBO3F2. In comparison with BaAlBO3F2, BaAlB3O6F2 and BaAl2(B3O6)2F2 exhibit a markedly elevated birefringence (0.0418 vs. 0.087/0.105 at 546 nm). Furthermore, BaAl2(B3O6)2F2 exhibits the largest band gap (7.87 eV) of all known F-containing aluminoborates. This work not only identifies two potential DUV birefringent materials, but also proposes a novel design approach for reconciling the conflicting properties between birefringence and bandgap.

A simple colorimetric and paper-based-smartphone sensing platform based on the enhanced peroxidase-like activity of Al doping Prussian blue for point-of-care detection of GSH

Ying Yang,Liuyan Wei,Weiqin You,Huisha Huang,Shuai Wang,Dandan Hou,Chujun Qin,Zhiheng Su,Mei Li

Glutathione (GSH) is a very important antioxidant and also participates in many important physiological processes, accurate determination of GSH in food and blood fluid is crucial for human health. Herein, we introduce a simple colorimetric and paper-based-smartphone dual signal output platform for point-of-care (POC) detection of GSH in garlic and human serum. The experiment revealed that the peroxidase-like activity of Aluminum-doped Prussian blue (AlPB) could be enhanced by the doping of Al element on Prussian blue. AlPB exhibited excellent peroxidase-like activity and efficiently catalyze the oxidation of 3,3′,5,5′-tetramethylbenzidine (TMB) in the presence of H 2 O 2 to generate blue oxidized TMB, resulting in an absorbance and color-based-smartphone dual signal readouts. Enzyme kinetic studies also indicated that the AlPB showed high affinity towards TMB. Hence, a reliable colorimetric and color-based-smartphone dual signal readouts assay was constructed based on AlPB-mediated the peroxidase-like activity, it was used for highly sensitive colorimetric and POC detection of GSH in food and human serum within 7 min with a wide range of linear response from 1 to 20 μM, a low detection limit of 0.1748 μM. This work demonstrates a novel and versatile strategy to develop superior peroxidase mimics and holds great potential for rapid and portable detection of GSH in food, healthcare and clinical diagnosis, and also open promising avenues for more powerful paper-based POC tests.

Al(SO4)(OH)·5H2O Stemming from Complexation of Aluminum Sulfate with Water-Soluble Ternary Copolymer and further Stabilized by Silica Gel as Effective Admixtures for Enhanced Mortar Cementing

Zhiyuan Song,Zainab Bibi,Sidra Chaudhary,Qinxiang Jia,Xiaoyong Li,Yang Sun

A water-soluble ternary copolymer bearing carboxyl, sulfonic, and amide functional groups was synthesized using ammonium persulfate-catalyzed free radical polymerization in water, resulting in high monomer conversion. This copolymer was then complexed with aluminum sulfate, forming an admixture containing Al(SO 4 )(OH)·5H 2 O, which was subsequently combined with silica gel. Characterization revealed that the synthesized copolymer formed a large, thin membrane that covered both the aluminum compounds and the silica gel blocks. The introduction of this complex admixture, combining the copolymer and aluminum sulfate, not only reduced the setting times of the cement paste but also enhanced the mechanical strengths of the mortar compared to using aluminum sulfate alone. The complex admixture led to the formation of katoite, metajennite, and C 3 A (tricalcium aluminate) in the mortar, demonstrating significant linking effects, whereas pure aluminum sulfate could not completely transform C 3 S within 24 h. Further addition of silica gel to the complex admixture further shortened the setting times of the paste, slightly reduced compressive strength, but improved flexural strength compared to the initial complex admixture. The silicon components appeared to fill the micropores and mesopores of the mortar, accelerating cement setting and enhancing flexural strength, while slightly decreasing compressive strength. This study contributed to the development of new cementing accelerators with improved hardening properties.

Reagent-free anti-fouling electrochemical immunosensor based on AL-BSA/AuNPs/PANI coating for the point-of-care detection of C-reactive protein in plasma and whole blood

Tai-Cheng Lu,Yi-Ting Lin,Wen-Biao Xiao,Qing-Zhen Qiu,Hui-Yun Tian,Yun Lei,Ai-Lin Liu

Developing the portable CRP detection technologies that are suitable for point-of-care (POC) and primary care management is of utmost importance, and advancing the electrochemical immunosensors hold promise for POC implementation. Nevertheless, non-specific adsorption of numerous interfering proteins in complex biological media contaminates immunosensors, thereby restricting the reliability in detection efficacy. In this study, a three-dimensional flower-leaf shape amyloid bovine serum albumin/gold nanoparticles/polyaniline (AL-BSA/AuNPs/PANI) coating on the surface of the electrode was developed, which demonstrated strong anti-adsorption properties against bovine serum albumin, plasma, and cells. The immunosensor exhibited a good linear relationship to CRP response, featuring a detection limit of 0.09 μg/mL, consistent with clinical reference range. In addition, the CRP immunosensor demonstrated excellent specificity in other inflammation-related proteins and commendable anti-interference performance for CRP detection in plasma and whole blood tests. Importantly, by combining the development of a USB flash disk-type portable electrochemical workstation with a reagent-free mode, the developed CRP electrochemical immunosensor delivered ideal results in clinical samples. The anti-fouling performance, sensitivity and specificity of the immunosensor, as well as its flexible test modes in clinical samples, provide important scientific basis for developing POC detection technologies of vital biomarkers in complex biological media.

Insight into the role of Si/Al of MCM-41 zeolite in non-thermal plasma-assisted catalytic oxidation of toluene over bimetal Nb-Mn supported on MCM-41

Xiaohong Yao,Jian Zhang,Chao Long

This study explored how the Si/Al ratio in Nb-Mn/MCM-41 catalysts affect toluene degradation via plasma catalysis. Adjusting the Si/Al ratio altered catalyst acidity and redox properties, decreasing the Si/Al ratio led to increased acidity, higher Mn 3+ /Mn 4+ ratio and greater O ads /O lat ratio as indicated by NH 3 -TPD, XPS, and O 2 -TPD analysis. Lower Si/Al (Nb-Mn/M(25)) boosted toluene removal efficiency to 98.2% under dry conditions due to increased oxygen vacancies and acidity. Moderate humidity enhanced conversion, but higher humidity levels proved detrimental, especially for low Si/Al catalysts. At a humidity level of 3.11 vol%, the toluene removal efficiency of Nb-Mn/M(25) exhibited a reduction of 15.3%, while Nb-Mn/M(200) with higher Si/Al ratio decreased only by 3%. Hydrophobic, higher Si/Al catalysts showed better resistance to humidity's negative impact. These findings offered insights into designing efficient catalysts for VOC removal by optimized Si/Al ratio and managing humidity.

Efficient removal of anionic Congo red by hickory-chip/peanut-shell biochar and Mg-Al hydrotalcite composites fabricated via modified co-precipitation-hydrothermal and buried carbon pyrolysis approach

Xiaodong Yang,Jin Tong,Xuefei Yang,Xueqin Shao,Tianyang Luo,Shengjun Zhao,Enshuo Zhang,Bowen Jiang,Lili Wang,Ye Han,Fanming Zeng,Andrew R. Zimmerman,Bin Gao

Recently, sustainable biochar composites created from waste biomass and other benign materials have attracted increasing attention for their promising potential in the removal of organic contaminants from environmental media. A facile approach combining coprecipitation-hydrothermal synthesis with buried carbon pyrolysis was used to produce composites composed of Mg-Al hydrotalcite and hickory-chip/peanut-shell biochar which was tested for its ability to remove anionic Congo red (CR) from aqueous solution. The composites exhibited high specific surface area, high micro-porosity, and abundant oxygen/carbon-containing functional groups. The sorbents derived from hickory and peanut shell exhibited maximum experimental CR adsorption capacities of 1045.6 and 1195.0 mg g -1 , respectively (20 times of pristine biochar) with removal rates of 86.1% and 98.3%, respectively, superior to those of hydrotalcite and many other advanced CR sorbents. The work highlights the potential of hydrotalcite/biochar composites as a promising adsorbent for water treatment and environmental applications.

A nanocomposite consisting of ionic liquid-functionalized layered Mg(II)/Al(III) double hydroxides for simultaneous electrochemical determination of cadmium(II), copper(II), mercury(II) and lead(II)

Zhou Jianfeng,Sun Guohan,Pan Jianbin,Pan Yufang,Wang Sumei,Zhai Haiyun

An electrochemical sensor is described for the simultaneous determination of Cd 2+ , Cu 2+ , Hg 2+ and Pb 2+ using square wave anodic stripping voltammetry. A glassy carbon electrode (GCE) was modified with N,N-dimethyl-N-2-propenyl-2-propen-1-aminium chloride homopolymer ionic liquid doped into magnesium(II)-aluminium(III) layered double hydroxides. The morphology investigations suggest that the material possesses typical interconnected laminated micropores and a mesoporous architecture dispersed on the surface of the GCE. This accelerates mass diffusion and facilitates the deposition-stripping process of metal ions. Key operational parameters including pH, deposition potential, deposition time and the quantity of nanomaterial on the GCE were optimized. The following figures of merit for the ions Cd 2+ , Cu 2+ , Hg 2+ and Pb 2+ are obtained under optimum conditions: (a) detection limits of 250, 25, 250 and 16 ng L −1 ; (b) linear ranges from 0.5 to 20, 0.05 to 20, 0.5 to 20 and 0.05 to 20 μg L −1 , and (c) peak potentials of −768, +42, +302 and − 541 mV (vs. Ag/AgCl). The modified GCE was successfully applied to the determination of these ions in spiked black tea extract and in dried tangerine peel . Schematic representation of novel electrochemical sensor based on a glassy carbon electrode modified with IL-Mg/Al-LDHs composites for the simultaneous detection of Pb 2+ , Cd 2+ , Cu 2+ and Hg 2+ .

CoM/diatomite (M = Mg and Al) for the activation of peroxymonosulfate to degrade atrazine in water: Effect of preparation method, role of acidic/basic sites, and catalytic mechanism

Shahzad Afzal,Lingyue Jin,Ke Pan,Dandan Duan,Yang Wei,Munir Ahmad,Muhammad Naeem Shah,Fengyuan Chen

A cost-effective and eco-friendly catalyst is desirable for activating peroxymonosulfate (PMS) into reactive oxygen species (ROS) to abate organic pollutants in water. It is the first-ever research to synthesize a highly efficient PMS-activator by incorporating cobalt on as-synthesized Mg- and Al-loaded diatomite (DM) by impregnation (IM) and precipitation-deposition (PD) methods. The catalysts showed a mixture of the plate and pinnate-like morphologies. Atrazine (ATZ) degradation by diatomite-based catalysts followed the order of Co6Mg10/DM-IM > Co6Mg10/DM-PD > Co6Al10/DM-IM > Co6Al10/DM-PD. ATZ removal by sole PMS and adsorption was negligible. The Co6Mg10/DM-IM morphology, structure, and catalytic activity were well-maintained after reuse, with minor Co (0.05 mg L −1 ) and Mg (3.05 mg L −1 ) leaching. The ROS ( OH, SO 4 − , O 2 − and 1 O 2 ) were generated due to redox couples [Co 2+ /Co 3+ , and O 2− /O 2 ] and decomposition of PMS. Improved catalytic efficiency was ascribed to the Co/Mg and Co/Al synergism, spatially interconnected architecture with lower charge-transfer resistance, open porous structure, diffusion-friendly channels, abundant OH groups, and ROS generation. This research provides an insight into how tuning the surface chemistry of DM in terms of acidity and basicity can enhance the catalytic activity of other transition metals (such Fe, Mn, Cu, and their composites) for AOPs.