Fundamental mechanisms of nanosecond-laser-ablation enhancement by an axial magnetic field

Farrokhi, Hamid; Gruzdev, Vitali E.; Zhou, Wei

doi:10.1364/josab.36.001091

Cited by 14 publications

(12 citation statements)

References 55 publications

(200 reference statements)

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“…The SEM image revealed the presence of spherical with some core-shell-based NPs [ 41 ] which were sparsely distributed. The changes in the morphology were probably due to the changes in the movements of the magnetic core of NPs (Fe 3 O 4 NPs), which formed parts of some of the NPs structures following the application of the magnetic fields throughout the LASER ablation process [ 42 ].…”

Section: Resultsmentioning

confidence: 99%

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: Resultsmentioning

confidence: 99%

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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“…A surface morphology change was observed during ablation in an externally applied magnetic field for nanosecond [22] and femtosecond [18] single laser pulses. Strong asymmetry in the ablation debris patterns were observed when a Si sample was placed on a flat magnet (B parallel to the Si surface normal) for laser ablation [18].…”

Section: Ablation Of Si In External B-fieldmentioning

confidence: 99%

Ablation in Externally Applied Electric and Magnetic Fields

Maksimovic

Katkus

et al. 2020

Nanomaterials

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To harness light-matter interactions at the nano-/micro-scale, better tools for control must be developed. Here, it is shown that by applying an external electric and/or magnetic field, ablation of Si and glass under ultra-short (sub-1 ps) laser pulse irradiation can be controlled via the Lorentz force F = e E + e [ v × B ] , where v is velocity of charge e, E is the applied electrical bias and B is the magnetic flux density. The external electric E-field was applied during laser ablation using suspended micro-electrodes above a glass substrate with an air gap for the incident laser beam. The counter-facing Al-electrodes on Si surface were used to study debris formation patterns on Si. Debris was deposited preferentially towards the negative electrode in the case of glass and Si ablation. Also, an external magnetic field was applied during laser ablation of Si in different geometries and is shown to affect ripple formation. Chemical analysis of ablated areas with and without a magnetic field showed strong chemical differences, revealed by synchrotron near-edge X-ray absorption fine structure (NEXAFS) measurements. Harnessing the vectorial nature of the Lorentz force widens application potential of surface modifications and debris formation in external E-/B-fields, with potential applications in mass and charge spectroscopes.

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“…Changing the ambient atmosphere, including conditions, namely, the application of various processing gases [3] or liquid flows top layers [4][5][6], gives additional flexibility to the ablation process. Various studies have been carried out by some research groups to investigate the effect of the magnetic field on the ablation process as well [7][8][9][10][11][12][13][14][15]. However, the applied field in these studies was mainly perpendicular to the laser beam close to the surface.…”

Section: Introductionmentioning

confidence: 99%

Magnetic-field assisted laser ablation of silicon

et al. 2021

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Understanding and manipulation of the laser processing quality during the ablation of solids have crucial importance from fundamental and industrial perspectives. Here we have studied the effect of external magnetic field on the micro-material processing of silicon by ultrashort laser pulses. It was found experimentally that such a field directed along the laser beam improves the quality and efficiency of the material removal. Additionally, we observe that the formation of laser-induced periodic surface structures (LIPSS) in a multi-pulse regime is affected by the external magnetic field. Our results open a route towards efficient and controllable ultrafast laser micromachining.

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Fundamental mechanisms of nanosecond-laser-ablation enhancement by an axial magnetic field

Cited by 14 publications

References 55 publications

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

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

Ablation in Externally Applied Electric and Magnetic Fields

Magnetic-field assisted laser ablation of silicon

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