Atomic-scale configurations of synchroshear-induced deformation twins in the ionic MnS crystal

Zhou, Yangtao; Xue, Yuan; Chen, D.; Wang, Y. J.; Zhang, B.; L., X.

doi:10.1038/srep05118

Cited by 7 publications

(4 citation statements)

References 44 publications

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“…The reconstructed 2D model of the atomic arrangement of the CoFe 2 O 4 nanocrystal along [011] showed that such defects are caused precisely by missing Co/Fe atoms in Oh sites. Twin defects are common in materials with the fcc crystal lattice and are observed both in synthetic and natural NPs and thin films; , nevertheless, in spinel-structured NPs, they have not yet received a detailed and broad description due to the experimental challenge to resolve their atomic-scale structure and lack of atomic-scale structural models.…”

Section: Resultsmentioning

confidence: 99%

Multifunctional Anisotropic Rod-Shaped CoFe₂O₄ Nanoparticles for Magnetic Resonance Imaging and Magnetomechanical Therapy

Nikitin,

Arkhipov,

Chmelyuk

et al. 2023

ACS Appl. Nano Mater.

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One-dimensional magnetic nanomaterials, such as nanorods, are one of the most interesting but unexplored objects due to the complexity of their manufacture. In this work, we report on the template-assisted preparation of rod-shaped cobalt ferrite (CoFe 2 O 4 ) nanoparticles (NPs) using the akaganeite (β-FeOOH) matrix and their application as multifunctional agents in biomedicine. In the beginning, rod-shaped β-FeOOH NPs are prepared by a forced hydrolysis technique. Then, amorphous Co(OH) 2 is deposited onto the surface of β-FeOOH. Finally, a solid-state reaction results in mesoporous rodshaped (130 nm × 40 nm) CoFe 2 O 4 NPs with a crystallite size of 7 nm. The proposed mechanism of synthesis involves the simultaneous transformation of β-FeOOH and amorphous Co(OH) 2 in two corresponding oxides during annealing, resulting in cation interdiffusion with the formation of a CoFe 2 O 4 phase, while the key role of the Co(OH) 2 shell in preserving the rod-shaped morphology of CoFe 2 O 4 NPs is demonstrated. NPs exhibit a high coercivity of 73 kA m −1 arising from their shape anisotropy, while their effective anisotropy constant of 1.1 × 10 5 J m −3 is compared to bulk CoFe 2 O 4 . Despite the low value of saturation magnetization (13 A m 2 kg −1 ), NPs demonstrate dual-modal relaxivity in MRI experiments with high values of r 1 = 2.3 s −1 mM −1 and r 2 = 228 s −1 mM −1 . Finally, we show that the magnetomechanical stimulus from NPs leads to the programmed death of breast cancer cells. Under the action of a low-frequency magnetic field (31 Hz), such NPs mediate mechanical vibrations, leading to cancer cell destruction even at a very low concentration of 6 μg CoFe 2 O 4 •mL −1 .

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Section: Resultsmentioning

confidence: 99%

Multifunctional Anisotropic Rod-Shaped CoFe₂O₄ Nanoparticles for Magnetic Resonance Imaging and Magnetomechanical Therapy

Nikitin,

Arkhipov,

Chmelyuk

et al. 2023

ACS Appl. Nano Mater.

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“…The MnS crystal has a NaCl-type structure with a lattice parameter of 0.526 nm [23], in which the primary slip system is {1 1 0}h1 1 0i [24,25]. To better identify the dislocation characters, the MnS crystal was tilted to [0 0 1] zone axis.…”

Section: Results and Discussion 31 Dislocation-preferential Dissolumentioning

confidence: 99%

“…Recent development of electro-optic system makes the TEM be a promising tool to quantitatively solve the defects' structures with sub-Ångström resolution [25,28,29]. Based on the HRTEM image, several strain-analysis techniques have been developed.…”

Section: The Strain Distribution Around An Edge Dislocation In Mnsmentioning

confidence: 99%

Strain-induced preferential dissolution at the dislocation emergences in MnS: an atomic scale study

Zhou

Wang

Zheng

et al. 2015

Philosophical Magazine

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The long-standing problem of dislocation-preferential dissolution in a crystal has been generally ascribed to the distortion energy stored in the vicinity of the dislocation core. However, due to lack of experimental means, the relationship between the local distortion state and the electrochemical behaviour of a single dislocation has not been established so far. via in situ ex-environment transmission electron microscopy (TEM), we demonstrate that the emergences of both edge and screw dislocations on MnS surfaces are the preferential sites for dissolution of the MnS inclusions within a stainless steel. In addition, we map the strain-induced variation of the standard electrode potential around the edge dislocation by a combination of the aberration-corrected high-resolution TEM and strain-analysis-based mechanochemistry theory. Significantly, our report provides a new approach to investigate the strain-corrosion correlation at an atomic scale.

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“…Or, more simply put, as the motion of a dislocation formed in the layer with the larger atomic species that forces the smaller atoms in the adjacent atomic layer to jump out of its way sideways. The associated stacking faults were first imaged at high resolution in 2005 [158], but it was not until 2019 that, after several studies using DFT calculations only [159,160], the motion of a synchroshear dislocation was confirmed in atomistic simulations [156].…”

Section: Specific Examples Of Defect Phases and Their Impact On Mater...mentioning

confidence: 99%

Defect phases – thermodynamics and impact on material properties

Korte‐Kerzel

Hickel

Huber

et al. 2021

International Materials Reviews

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Two approaches in materials physics have proven immensely successful in alloy design: First, thermodynamic and kinetic descriptions for tailoring and processing alloys to achieve a desired microstructure. Second, crystal defect manipulation to control strength, formability and corrosion resistance. However, to date, the two concepts remain essentially decoupled. A bridge is needed between these powerful approaches to achieve a single conceptual framework. Considering defects and their thermodynamic state holistically as 'defect phases', provides a future materials design strategy by jointly treating the thermodynamic stability of both, the local crystalline structure and the distribution of elements at defects. Here, we suggest that these concepts are naturally linked by defect phase diagrams describing the coexistence and transitions of defect phases. Construction of these defect phase diagrams will require new quantitative descriptors. We believe such a framework will enable a paradigm shift in the description and design of future engineering materials.

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Atomic-scale configurations of synchroshear-induced deformation twins in the ionic MnS crystal

Cited by 7 publications

References 44 publications

Multifunctional Anisotropic Rod-Shaped CoFe₂O₄ Nanoparticles for Magnetic Resonance Imaging and Magnetomechanical Therapy

Multifunctional Anisotropic Rod-Shaped CoFe₂O₄ Nanoparticles for Magnetic Resonance Imaging and Magnetomechanical Therapy

Strain-induced preferential dissolution at the dislocation emergences in MnS: an atomic scale study

Defect phases – thermodynamics and impact on material properties

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Atomic-scale configurations of synchroshear-induced deformation twins in the ionic MnS crystal

Cited by 7 publications

References 44 publications

Multifunctional Anisotropic Rod-Shaped CoFe2O4 Nanoparticles for Magnetic Resonance Imaging and Magnetomechanical Therapy

Multifunctional Anisotropic Rod-Shaped CoFe2O4 Nanoparticles for Magnetic Resonance Imaging and Magnetomechanical Therapy

Strain-induced preferential dissolution at the dislocation emergences in MnS: an atomic scale study

Defect phases – thermodynamics and impact on material properties

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Product

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Multifunctional Anisotropic Rod-Shaped CoFe₂O₄ Nanoparticles for Magnetic Resonance Imaging and Magnetomechanical Therapy

Multifunctional Anisotropic Rod-Shaped CoFe₂O₄ Nanoparticles for Magnetic Resonance Imaging and Magnetomechanical Therapy