Journal of Materials Research最新文献

A novel pH-responsive drug carrier for the delivery of specific Docetaxel (DTX) administration is developed based on a zeolitic imidazolate framework (ZIF-8). Aminating the surface of ZIF-8 is allowed for the conjugation of folic acid (FA). Several spectroscopic studies characterized the newly fabricated DTX-encapsulated folic acid-embedded ethylene diamine (ED) ZIF-8 nanocomposites (DTX/FA@ED-ZIF-8). It has excellent chemical stability and high drug-loading efficiency. DTX from the folic acid-embedded aminated ZIF-8 (FA@ED-ZIF-8) is three-fold more efficient under acidic pH (5.0) than in physiological settings (pH 7.4), according to in vitro drug release tests. DTX/FA@ED-ZIF-8 exhibited cytotoxicity of 76.8% in an MTT experiment conducted in A549 and H1299 cells. Cell morphological and nuclear staining were investigated in the fabricated samples to support the MTT experiments. Further, the apoptosis mode of cell death was examined using Annexin V-FITC and PI by flow cytometry. These findings indicate that FA@ED-ZIF-8 holds great potential as a drug carrier for precise dosing.

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The cage-like CdS/MgFe₂O₄ Step-scheme heterojunctions (S-scheme heterojunction) material was synthesized by loading CdS onto the surface of magnetic MgFe₂O₄. The crystal structure, morphology and properties of the catalyst were fully characterized, and the photocatalytic performance of the catalyst was investigated by photodegradation of tetracycline hydrochloride (TCH). The crystalline structure of CdS/MgFe₂O₄ is dominated by the cubic spinel structure of MgFe₂O₄ with a hollow cage morphology. CdS and MgFe₂O₄ form a tight-binding S-scheme heterostructure, which can accelerate the recombination of ineffective charge carriers and promote the separation of the effective charge carriers via the internal electric field, enabling CdS/MgFe₂O₄ to maintain an optimal redox potential. Compared with pure CdS and MgFe₂O₄, CdS/MgFe₂O₄ is more effective on degradation of TCH. Moreover, magnetic separation, recovery, and recycling of the composite catalyst can be achieved without secondary contamination by using the magnetic properties of the CdS/MgFe₂O₄.

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Pt-based intermetallics exhibit distinctive physicochemical properties for electrocatalytic and thermocatalytic applications. It has been recognized that their catalytic performance is determined by their composition, configuration and surface structure. In this review, we summarize the advancements in the structural optimization of Pt-based intermetallic catalysts. We first introduce the crystal structures of Pt-based intermetallics, followed by a recapitulation of the thermodynamic and kinetic theory used to achieve these structures. Then, the optimization strategies, including ordering approaches and crystal regulation methods, are summarized. Furthermore, we delve into a discussion on the enhanced catalytic functions of Pt-based intermetallics in electrocatalysis and thermocatalysis. Finally, we outline future research directions focused on the practical industrial applications. We believe this review can inspire further exploration of materials for catalytic applications.

In this work, ultrafine grained commercially pure titanium (Cp-Ti) was developed using repetitive corrugation and straightening (RCS) process. The optical micrographs revealed a 90% grain refinement of processed sample to 5 µm from initial size of 50 µm. The microhardness value revealed a 44.70% increase in hardness from 170 to 246 HV. The ultimate tensile strength was found to be 589 MPa which is 37% more than the as-received sample. The contact angle (45.3°) of processed sample exhibits the hydrophilic behavior of processed sample. This further facilitated the enhanced protein adsorption and cell attachment in the samples which was instantiated by the biocompatibility studies. The in-vitro bioactivity study was conducted on the immersed samples in simulated body fluid and a dense apatite growth with a Ca/P ratio of 1.66 was observed. Hence, RCS processed Cp-Ti is suggested as a potential candidate for load bearing applications.

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Finding eco-friendly solvents that can replace conventional toxic ones (N-methyl-2-pyrrolidone and dimethylacetamide) in the production of polymeric membranes is of great interest. In this study, membranes were produced using the phase inversion technique using polysulfone, polyvinylpyrrolidone, and Cyrene—a recently developed solvent, whose physicochemical profile is comparable to conventional ones, but is biodegradable, non-toxic, and eco-friendly. The resulting membranes were characterized regarding their morphological and structural properties, permeation performance, rejection of reference solutes and an emerging contaminant, and antifouling performance. Scanning electron microscopy, contact angle determination, Fourier transform infrared spectroscopy, and filtration tests were accomplished for that. It was possible to use Cyrene to produce polysulfone-based membranes, in which the one with 5% polyvinylpyrrolidone was the membrane with the highest permeability. Conversely, the membrane without polyvinylpyrrolidone and with a 30-min heat treatment achieved 73% rejection of the emerging contaminant evaluated.

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Inspired by the internal spiral structure of the mantis shrimp claw rod, a new type of beam-shaped composite materials with spiral-layered arrangement were designed, and the corresponding strengthening and toughening mechanisms with different spiral arrangement modes were explored. It is found that, unlike the existing shells or plates with spiral structures, a smaller spiral angle is of great significance to coordinate the contradiction between strength and toughness of beam materials. As the angle changes (small spiral angle), the full-field distribution of each stress component will undergo significant changes, leading to a transformation of the key stress components that dominate the damage and failure behavior. By adjusting the spiral angle, certain normal stress components inside can be reduced to improve the strength, and certain shear stress components can be increased to improve the toughness. These results will provide optimization strategies for the mechanical design of beam.

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The beam with an internal structure of spiral laminated fiber has been designed. Its strength and toughness can be regulated and optimized by the stress distribution and the deformations and failure behavior controlled by the spiral angle.

This study focuses on synthesizing and characterizing Mg-doped SnO₂ nanoparticles as a safe substitute for lead-based X-ray shielding aprons. Various molar weight percentages of Mg dopant were utilized during synthesis, and the resulting samples were analyzed using multiple techniques, such as X-ray diffraction, UV–visible, Photoluminescence, Raman spectroscopy, energy-dispersive X-ray spectroscopy, high-resolution transmission and scanning electron microscopes. The nanoparticles were then combined with a nano-epoxy polymer composite and coated onto rexine cloth through drop casting. To assess the X-ray shielding performance, the percentage of attenuation, attenuation coefficient, and half-value layer studies were conducted. Comparative analysis with traditional lead oxide (PbO) aprons revealed that the 3% Mg-doped SnO₂ nanocomposite aprons exhibited superior X-ray attenuation properties. In summary, this study highlights the potential of Mg-doped SnO₂ nanoparticles as an effective, hydrophobic, and lightweight alternative to commercial aprons that are made of toxic, hydrophilic, and heavy lead-based materials.

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Chlorpyriphos an organophosphorus pesticide, is readily absorbed through the skin of humans and poses the serious risk. In present study the surface modification of Fe-based metal organic framework (MIL-153) was carried out with silica for studying its efficiency toward adsorptive removal of Chlorpyriphos. For studying the physico-chemical properties of MIL-53/SiO₂ composite various characterization techniques like FTIR, BET, FE-SEM, EDS, XRD, and PSA were utilized. The effect of most significant parameters was optimized, and maximum removal of 60% was observed at pH 6. The monolayer adsorption onto energetically equivalent sorption sites described the chlorpyriphos capture by MIL-53/SiO₂. The maximum adsorptive capacity obtained by the non-linear Langmuir model was 58.5 mg chlorpyriphos per g MIL-53/SiO₂. Additionally, the kinetic models revealed the dependence of rate on the adsorptive capacity of adsorbent.

One-step co-precipitation method was used to prepare the flower-like BiOCl/BiOBr composite materials (BOBCs) with heterojunction structures, in which various amounts of BiOBr were used to adjust the band gap of BiOCl and thereby improve its photocatalytic activity. Based on photocatalytic performance experiments, BOBC2, in which the molar ratio of BiOCl to BiOBr is 1:0.75, exhibited the highest photodegradation efficiency (90.5%) to remove ofloxacin after 100 min illumination. The cyclic utilization performance of BOBC2 under the same conditions was tested by a cycle experiment. It was found that its photocatalytic activity remained at a high level after three cycles. The composition and microstructure of the material were analyzed by characterization techniques including XRD, FTIR, XPS, and SEM. The optical properties and the degradation process of the material were studied by DRS, PL, photocurrent, and active species trapping methods. The reasonable mechanism for photocatalytic degradation of ofloxacin was proposed.

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To prevent causing pain during movement of the skeleton system, modern drug delivery systems use carriers to protect the drug, deliver it to the target site, and increase its efficiency. Liposomal encapsulation technology is one of the most promising carriers due to its biocompatibility, natural components, and cell membrane-like structure. In this study, liposomes containing vitamin E were used to increase osteoblast cells’ metabolism. Liposomes were prepared by hydrating a lipid film and loaded using a passive loading technique. DLS and zeta potential tests showed good stability and optimal size distribution. The cell culture results showed non-toxicity and improved bone cell growth. Alkaline phosphatase activity increased in the samples containing vitamin E. Samples were prepared in three DOPE: CHEMS ratios and sonication times. The best result was from the sample with a 4:1 ratio and 20-min sonication time, which showed the maximum vitamin E loading capacity.

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