Synthesis of Core–Shell Micro/Nanoparticles and Their Tribological Application: A Review

Chen, Hao; Lin, Zhongqin; Li, Mengyu; Xie, Guoxin

doi:10.3390/ma13204590

Cited by 53 publications

(24 citation statements)

References 105 publications

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“…The making of the core-shell iron oxide-titania NPs by TiO 2 insertion as the core of the core-shell through following an independent synthetic approach has provided an option in finding metal-based site-specificity to the tumor location, especially the biosystems deep-located and embedded cancers. The core-shell nanocomposite structures are known to increase the composite NPs stability and provide enhanced dispensability, together with magnetically driven delivery and heat generation at the site [ 24 , 25 ]. The characteristics and requirements have placed the core-shell materials as a potential target for further investigations.…”

Section: Introductionmentioning

confidence: 99%

[Retracted] Preparation of Iron Oxide and Titania‐Based Composite, Core‐Shell Populated, Nanoparticulates Material by Two‐Step LASER Ablation in Aqueous Media as Antimicrobial and Anticancer Agents

Bahjat

Ismail

Sulaiman

et al. 2022

Bioinorganic Chemistry and Applications

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Iron oxide and titania-based composite nanoparticles (NPs) populated with core-shell structures, as part of the mixture of the monometallic NPs, were prepared in water medium by the two-fluence LASER ablation technique by applying 30 and 60 mJ/cm2 LASER energy irradiations. The prepared monometallics, composite, and core-shell NPs structures were confirmed from the XRD, TEM, and EDX analyses, followed by the FE-SEM and UV absorptions. Optically, the NPs exhibited an increase in the energy gap from 3.27 eV to 3.75 eV as LASER fluence increased from 30 mJ/cm2 to 60 mJ/cm2. The average NPs core size distributions for the core-shell material ranged at ∼70 nm with the shell thickness around 20 nm. The biggest NPs were of ∼170 nm size which were sparsely distributed. The magnetization behaviors of the NPs were also investigated using the vibrating sample magnetometer (VSM). The NPs showed antimicrobial activities against the pathogenic species: Escherichia coli and Staphylococcus aureus. The antimicrobial activities of the synthesized NPs, synthesized under the influence of magnetic fields, were found to be more potent than the NPs synthesized without the presence of any magnetic field. The NPs prepared under the influence of the magnetic fields also comparatively exhibited higher levels of cytotoxicity against lung cancer cell lines (A549) than the NPs prepared under no magnetic field’s influence by the similar energy level effects of the LASER fluence. The flow cytometry analyses confirmed the NPs’ cytotoxic impacts against the human lung cancer A549 cell lines through the initiation of apoptosis and promotion of the cell cycle arrest at the G1 phase of cell division. To further confirm the cytotoxic effects and the mechanism of the anticancer activity of the synthesized NPs against the A549 cell lines, several related parameters (cell viability, membrane permeability, nuclear intensity, and cytochrome-C release) were analyzed using the high-content screening (HCS) assay. The study suggested that the prepared NPs have potential as antimicrobial and also as anti-lung-cancer agents as tested in vitro. These NPs can also be part of combined chemotherapy in different oncological interventions, as well as a sonosensitizer in sonomagnetic heating-based therapy, especially for cancers.

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Section: Introductionmentioning

confidence: 99%

[Retracted] Preparation of Iron Oxide and Titania‐Based Composite, Core‐Shell Populated, Nanoparticulates Material by Two‐Step LASER Ablation in Aqueous Media as Antimicrobial and Anticancer Agents

Bahjat

Ismail

Sulaiman

et al. 2022

Bioinorganic Chemistry and Applications

View full text Add to dashboard Cite

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“…Core–shell nanostructures are a two-component system consisting of an inner layer and a guest nanoparticle of different material that the inner layer encapsulates. These nanostructures are widely used in a variety of applications, such as drug delivery systems [ 23 , 24 ], tribology [ 25 ] and smart farming [ 26 ]. An interesting form of a core-shell particle is a porous hollow polymeric capsule.…”

Section: Introductionmentioning

confidence: 99%

Regular Polymeric Microspheres with Highly Developed Internal Structure and Remarkable Thermal Stability

2021

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In this study, the synthesis and characterization of permanently porous polymeric microspheres was presented. The microspheres were obtained via suspension polymerization using diverse functional monomers, such as 4,4′-bis(methacryloyloxymethylphenyl)sulphone, 1,4-bis(methacryloyloxymethyl)benzene, 4,4′-bis(methacryloyloxymethylphenyl)methane, N-vinylpyrrolidone, ethylene glycol dimethacrylate, and divinylbenzene as a co-monomer. As porogenic solvents, toluene and chlorobenzene were applied. The main aim of the research was to synthesize polymers having a highly developed internal structure and a good thermal stability. The synthesized materials were characterized by ATR-FTIR, scanning electron microscopy, a size distribution analysis, a low-temperature nitrogen adsorption–desorption method, differential scanning calorimetry, and thermogravimetry coupled with FTIR and inverse gas chromatography. It was found that, depending on the functional monomer, regular microspheres with a specific surface area in the range of 418–746 m2/g can be successfully synthesized. Moreover, all the synthesized copolymers showed a good thermal stability. In helium, they exhibited 5% mass losses at temperatures over 300 °C, whereas in air these values were only slightly lower. In addition, the presence of miscellaneous functional groups promoted diverse kinds of interactions. Therefore, the microspheres can be possibly use in many adsorption techniques including high temperature processes.

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“…Under boundary lubrication, using microparticles of soft-shell and rigid-core as lubricant additives can not only take advantage of the easy formation of a transfer lm, but also bring the advantages of small size and bearing advantage of the hard nanoparticles into full play [38]. The two-phase composite particles were gradually peeled off during the rolling process, which promote the uniformity and integrity of the transfer lm and enhance the self-healing capacity [14].…”

Section: Lubrication Mechanismmentioning

confidence: 99%

“…To compensate for the shortcomings of onefold solid additive, core-shell structure additives with soft shell and hard core were constructed recently [12][13][14][15]. The core-shell structure can not only perform the deformation ability of the soft shell, but also play the bearing function of hard core.…”

Section: Introductionmentioning

confidence: 99%

Tribological Properties of SiO2@Cu and SiO2@MoS2 Core–Shell Microspheres as Lubricant Additives

Gan

et al. 2021

Tribol Lett

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Herein, core-shell structural SiO 2 @Cu and SiO 2 @MoS 2 microspheres were prepared using SiO 2 as hard core, Cu and MoS 2 as shell. As lubricant additives were introduced into base oil (PAO 40), their frictionreduction and wear-resistance were investigated in detail. Comparing with onefold additive (SiO 2 , Cu and MoS 2 ), such core-shell structure additives can improve the tribological behaviors at the Hertz contact stress range of 1.26 ~ 2.72 GPa (SiO 2 @Cu reduces the friction and wear up to 32.47% and 67.86% at 2.72 GPa, respectively). Besides, the tribological properties of SiO 2 @Cu microspheres are superior to that of SiO 2 @MoS 2 (the wear volume was reduced by 48.45% at 2.72 GPa). The excellent tribological behaviors of SiO 2 @Cu microspheres can be ascribed to its structural advantage, the synergistic effect of hard SiO 2 core and Cu shell. The rolling effect of SiO 2 , easy-shearing and self-repairing of Cu shell offer a synergistic lubrication function and form a dense protection lm, thereby contributing to the optimal lubrication performance.

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Synthesis of Core–Shell Micro/Nanoparticles and Their Tribological Application: A Review

Cited by 53 publications

References 105 publications

[Retracted] Preparation of Iron Oxide and Titania‐Based Composite, Core‐Shell Populated, Nanoparticulates Material by Two‐Step LASER Ablation in Aqueous Media as Antimicrobial and Anticancer Agents

[Retracted] Preparation of Iron Oxide and Titania‐Based Composite, Core‐Shell Populated, Nanoparticulates Material by Two‐Step LASER Ablation in Aqueous Media as Antimicrobial and Anticancer Agents

Regular Polymeric Microspheres with Highly Developed Internal Structure and Remarkable Thermal Stability

Tribological Properties of SiO2@Cu and SiO2@MoS2 Core–Shell Microspheres as Lubricant Additives

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