Journal of Nanoparticle Research最新文献

Corrosion is a widespread issue affecting many aspects of daily life. To further improve the anti-corrosion performance of nano-Ti polymer coatings from our previous research, graphene slurry is filled to modify nano-Ti epoxy resin coatings. The structure, anti-permeability, anti-corrosion, and anti-wear properties of nano-Ti polymer functional coatings with different graphene slurry were systemically investigated by field emission scanning microscopy (FE-SEM), Fourier transform infrared spectroscopy (FT-IR), immersion test, electrochemical measurements, and wear test. The FE-SEM results showed that graphene can be well dispersed in nano-Ti polymer coating when the graphene content is 0.5 wt%. Furthermore, the results showed that the addition of graphene can improve the anti-permeability, anti-corrosion, and anti-wear properties of nano-Ti polymer coatings. The water uptake of nano-Ti polymer/graphene functional coatings was reduced from 2.4 to 0.05%. The friction coefficient of the coatings also decreased from 0.53 to 0.22 due to the good dispersion of graphene slurry. The corrosion resistance of the functional coatings decreased with increasing graphene slurry. Nano-Ti polymer/graphene functional coatings showed optimal comprehensive performance and anti-corrosion performance as the graphene content was 0.5 wt%; the appropriate amount of graphene slurry can effectively improve the anti-corrosion performance of the nano-Ti polymer coating.

Borophene, a two-dimensional (2D) monolayer of boron atoms, corroborated phenomenal growth for its exceptional anisotropic properties, including high surface area, tunable bandgap, and superior electronic conductivity, positioning it as a cutting-edge material for energy storage applications. This review critically assesses borophene’s potential, emphasizing its remarkable theoretical storage capacities for Li-ion and Na-ion batteries, underpinned by ultrafast ion-diffusion pathways with minimal energy-barriers and bandgap (9.43eV in zigzag-direction) (Duo et al. Coord Chem Rev 427: 213549, 2021). Advanced density functional theory simulations elucidate borophene’s structural stability, ion-transport mechanisms, and tunable electronic properties achieved through carrier doping, defect engineering, and strain modulation. The review highlights novel synthesis strategies, such as plasma ion-implantation on unconventional substrates like carbon cloth and silicon, mitigating existing fabrication bottlenecks. Experimental validations confirm borophene’s superior electrochemical performance, demonstrating exceptional electrocatalytic activity with low overpotentials for hydrogen evolution reactions and high specific capacitance in supercapacitors. Concomitantly, various approaches encompassing carrier-doping, external-strain, and defect formation that assist in tuning the features of borophene have been discussed briefly in this study. By integrating theoretical insights with experimental advancements, this study identifies critical research-gaps and presents critical discussions and roadmap for leveraging borophene’s anisotropic features in next-generation energy storage systems, advancing the frontier of 2D-materials for sustainable energy technologies.

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Compression-induced phase transitions in supercooled liquid and glassy confined germanene are studied via molecular dynamics (MD) simulations. Glassy state is obtained by cooling from the melt to 300 K under zero pressure. Then, some selected atomic configurations at temperatures above and below ({T}_{g}) are taken as initial supercooled liquid or glassy two-dimensional (2D) models for the isothermal compression from low-density to high-density states in order to study compression-induced phase transitions in the models. We find formation of the triangular-hexa (trh) germanene as the most stable state in the high-density region. Moreover, we find the compression-induced amorphization of supercooled liquid and amorphous-amorphous phase transitions in the system.

In this work, the interactions of ethylene oxide (C₂H₄O) molecule over the MoS₂ monolayers functionalized with different clusters of Ag atoms were investigated using density functional theory outlook. Our obtained results confirmed that Ag cluster–modified MoS₂ nanosheets had excellent adsorption capacity for ethylene oxide molecules. The variations in the electronic properties were explained based on the band structure and charge density redistribution analyses. Our charge density distribution calculations represented the large collection of atomic charges above the adsorbed molecules. By plotting the projected density of states, we described the interaction occurred between the oxygen atoms of ethylene oxide molecules and Ag clusters. Adsorption distance, energies, angles, and other structural factors were also calculated for describing the results. Therefore, based on our results, we can propose the Ag cluster–modified MoS₂ systems as effective ethylene oxide (C₂H₄O) detection devices for real phase applications.

Glioblastoma (GBM) originates from cancerous cells of the central nervous system (CNS) in the brain and spinal cord, and is the most common malignant primary tumor in brain tumors, with a high degree of aggressiveness and resistance to treatment, accounting for 48.6% of CNS malignant tumors. Although metal–organic frameworks (MOFs) have been widely used in drug delivery, developing nanocarriers with both high stability and biocompatibility remains a significant challenge. This study developed a novel composite nano drug delivery system, PLGA-PDI@CP1@1, which combines poly(lactic-co-glycolic acid) (PLGA) and perylene diimide (PDI) with excellent fluorescence properties to effectively encapsulate MOF-based CP1. The system was further loaded with an active compound extracted from ginseng (compound 1) for the treatment of gliomas. Through in vitro cellular experiments, we found that PLGA-PDI@CP1@1 was able to inhibit the proliferation of cancer cells by suppressing the expression of the glioma proliferation-associated gene MAGED4.

The thermodynamic and vibrational behavior of nanoparticles is known to exhibit unusual size dependent properties. We present the results of a theoretical model for the cohesive energy, melting temperature and Debye temperature of silver (Ag) and gold (Au) nanoparticles, developed and analyzed using computer simulations in MATLAB, and validated against experimental data and other theoretical predictions. The results indicate that nanoparticles have lower cohesive energies because of the surface atoms that dominate, resulting in lower melting and Debye temperatures with decreasing particle size. The cohesive energy of Ag nanoparticles decreases from ~ 285 kJ/mol in the bulk to ~ 230 kJ/mol at 5 nm, accompanied by a corresponding decrease in the melting temperature from 1235 K to ~ 700 K, Debye temperature from 230 K to ~ 100 K. The cohesive energy of Au nanoparticles lowers from ~ 368 kJ/mol for bulk to ~ 300 kJ/mol for 5 nm, and the melting temperature and Debye temperature drop from 1337 and 415K, respectively, to around ~ 600K and ~ 200K simultaneously. The experimentally observed and theoretically predicted size dependent trends in these properties are consistent with these trends showing that these properties are intertwined by the atomic bonding strength and vibrational dynamics. All three properties are higher for Au due to stronger metallic bonding. These results offer valuable insights for the design and optimization of metallic nanoparticles in therapeutic cargo delivery, as well as for catalysis, thermal management, and advanced material processing.

Nanocapsule was obtained by self-assembling of sodium alginate (SA) with cetyl trimethyl ammonium bromide (CTAB) and Tween 80 in a coarse dispersion of butyl acetate and turned out to be a good carrier of emamectin benzoate (EB). The nanocapsule exhibited better storing stability, anti-photolysis property, foliar wettability, and retention, as compared to the conventional concentrated emulsion of EB (EB-EC). Incorporation into the nanocapsule retarded the release of EB, which was pH-sensitive and dependent on the structure of the nanocapsule. A better sustaining effect could be achieved by an increase of SA or a reduction of CTAB and in a basic environment, due to the enhanced interaction between the active ingredient and the shell matrix of the nanocapsule. The incorporation into the nanocapsule greatly increased the activity of EB. The median lethal concentration of typical positively charged nanocapsule EB@SA_0.1CTAB_0.4Tw_0.2 against Mythimna separata larvae was 48% of that of commercial EB-EC, after feeding to the insect for 48 h. The result indicated that the self-assembling of SA and CTAB was a good strategy to fabricate instant nanoformulation under mild conditions and with high efficiency and low cost, which was valuable to prompt nanopesticides from laboratory investigation to field application.

A novel magnetic mesoporous nanocomposite, carbon nitride (C₃N₄)/Fe₃O₄/NiFe layered double hydroxide (LDH), as a seriously efficient catalyst, was constructed via the growth of NiFe-LDH on Fe₃O₄ supported over C₃N₄ and it was analyzed using fourier-transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), energy dispersive X-ray analysis (EDS), field emission scanning electron microscopy (FE-SEM), Brunauer–Emmett–Teller (BET), and simultaneous thermal analysis (STA) techniques. The catalytic performance of the C₃N₄/Fe₃O₄/NiFe-LDH composite was evaluated in the formation of dihydropyrimidinone derivatives. It has been confirmed that the C₃N₄/Fe₃O₄/NiFe-LDH composite is very efficient for synthesizing dihydropyrimidinone derivatives. This is accomplished through reacting various aldehydes, ethyl acetoacetate, and urea, resulting in impressive yields of 91 to 96% without the use of solvents at 80 °C. The process requires a catalyst loading of 15 mg and takes between 5 to 15 min, making it an environmentally friendly method. Furthermore, C₃N₄/Fe₃O₄/NiFe-LDH has shown the ability to be recycled for five cycles.

Attractive flower-shaped silver nanostructures with abundant nano-gaps were synthesized by a rapid one-step chemical reduction method at room temperature in the presence of as reducing agent and PVP as surfactant. The morphological and optical properties of the obtained 3D silver nano-flowers (AgNFs) were characterized by FE-SEM, XRD, and UV-VIS spectroscopy. The SEM images revealed the formation of AgNFs with high nano-textured surface morphologies. The AgNFs obtained at high phenylhydrazine concentration favor the nanoscale roughness that contributes significantly to the high sensitivity of surface-enhanced Raman scattering (SERS) activity. The AgNFs were found to possess excellent stability and can be stored for several months. SERS substrates had a limit of detection (LoD) of 2.1×10⁻⁷ M obtained for Rhodamine B (RhB). Furthermore, two chloride salts (NaCl and MgCl₂) were added to AgNFs suspension to improve the SERS signal. Under optimal conditions, the SERS substrates prepared with various salts exhibit increased sensitivity and higher intensity levels compared to those without the addition of salts. The SERS substrates showed an enhancement in LoD on the order of 10⁻⁹ M obtained for both RhB and rhodamine 6G (Rh6G) used as SERS probes. This work shows a promising approach to developing a SERS platform for the detection of organic chromophores.