The study of entropy change and magnetocaloric response in magnetic nanoparticles via heat capacity measurements

Kapusta, Ondrej; Zeleňáková, A.; Hrubovčák, Pavol; Tarasenko, R.; Zeleňák, Vladimı́r

doi:10.1016/j.ijrefrig.2017.11.024

Cited by 8 publications

(5 citation statements)

References 34 publications

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“…On the left side, P 2 rapidly grows while the speed of growth decreases quickly after the peak. The shape of this curve reminds us of the behavior of heat capacity against temperature during phase transition in magnetic nanoparticles (Kapusta et al, 2018). In the above-explained scenario, the cells or small clusters are apart from one another.…”

Section: Resultsmentioning

confidence: 57%

Network Analysis Identifies Phase Transitions for Tumor With Interacting Cells

Darooneh

Kohandel

2022

Front. Physiol.

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Metastasis is the process by which cancer cells acquire the capability to leave the primary tumor and travel to distant sites. Recent experiments have suggested that the epithelial–mesenchymal transition can regulate invasion and metastasis. Another possible scenario is the collective motion of cells. Recent studies have also proposed a jamming–unjamming transition for epithelial cells based on physical forces. Here, we assume that there exists a short-range chemical attraction between cancer cells and employ the Brownian dynamics to simulate tumor growth. Applying the network analysis, we suggest three possible phases for a given tumor and study the transition between these phases by adjusting the attraction strength.

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Section: Resultsmentioning

confidence: 57%

Network Analysis Identifies Phase Transitions for Tumor With Interacting Cells

Darooneh

Kohandel

2022

Front. Physiol.

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“…Heat capacity (C p ) measurements gives an indirect determination of this phase-transition temperature. 45,46 C p is computed by taking the internal energy's derivative with respect to temperature (details are provided in the Supplementary Material). Our simulation results for the 2.3-nm NPs, Fig.…”

Section: Please Cite This Article Asmentioning

confidence: 99%

“…As discussed above, this disagreement is likely caused by structural changes in the NPs, and therefore out of scope of the present calculations.Locating the Curie transition on magnetic nanoclusters is challenging. Heat capacity (C p ) measurements gives an indirect determination of this phase-transition temperature 45,46. C p is computed by taking the internal energy's derivative with respect to temperature (details are provided in the Supplementary Material).…”

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confidence: 99%

Spin-lattice dynamics of surface vs core magnetization in Fe nanoparticles

Santos

Meyer

Aparicio

et al. 2021

Applied Physics Letters

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Magnetization of clusters is often simulated using atomistic spin dynamics for a fixed lattice. Coupled spinlattice dynamics simulations of the magnetization of nanoparticles have up to now neglected the change in the size of the atomic magnetic moments near surfaces. We show that the introduction of variable magnetic moments leads to a better description of experimental data for the magnetization of small Fe nanoparticles. To this end we divide atoms into a surface-near shell and a core with bulk properties. It is demonstrated that both the magnitude of the shell magnetic moment and the exchange interactions need to be modified to obtain a fair representation of the experimental data. This allows for a reasonable description of the average magnetic moment versus cluster size, and also the cluster magnetization versus temperature.

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“…Yet another motivation for detailed scrutinizing of the Co/Au bimetallic NPs comes from the results of our recent works. They revealed a direct relation between super-spinglass freezing followed by the onset of nonequilibrium magnetic dynamics and the enhanced magnetocaloric response of the NPs [20]. On the other hand, Yamamoto and co-workers [21,22] showed that, in the case of superparamagnetic systems where blocking instead of superspin freezing is dominant, magnetocaloric effect performance significantly decays with particles' size distribution increment.…”

Section: Introductionmentioning

confidence: 99%

Magnetic relaxation process determination in the Co/Au nanoparticle system

et al. 2020

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Nonequilibrium magnetic dynamics has been investigated in the Co/Au bimetallic nanoparticle system. The system exhibits typical superparamagnetic behavior at higher temperatures and unequivocal hallmarks of magnetic relaxation process at T ∼ 7 K. Since different scenarios of magnetic transition can be hypothesized here, detailed analysis of magnetization ac and dc experimental data has been performed. Specific methods have been employed in order to reveal the nature of the examined process. The observation of critical dynamics [power-law divergence of the relaxation time at T g ; dynamic scaling of χ (T, f ) data] and aging effects in the presence of strong interparticle interactions provide evidence that the system undergoes a transition to a super-spin-glass state rather than to a super-spin-blocked state.

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The study of entropy change and magnetocaloric response in magnetic nanoparticles via heat capacity measurements

Cited by 8 publications

References 34 publications

Network Analysis Identifies Phase Transitions for Tumor With Interacting Cells

Network Analysis Identifies Phase Transitions for Tumor With Interacting Cells

Spin-lattice dynamics of surface vs core magnetization in Fe nanoparticles

Magnetic relaxation process determination in the Co/Au nanoparticle system

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