Curie temperature determination via thermogravimetric and continuous wavelet transformation analysis

Hasier, John; Riolo, Michael L.; Nash, Philip

doi:10.1140/epjti/s40485-017-0040-y

Cited by 16 publications

(4 citation statements)

References 26 publications

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“…5 mg) were heated from 25 to 800 °C using a scanning rate of 20 °C min −1 . According to the literature [ 54 ], the temperature calibration of the apparatus was conducted on the basis of the Curie temperatures of standards (nickel, cobalt and their alloys).…”

Section: Methodsmentioning

confidence: 99%

Hybrid Green Materials Obtained by PCL Melt Blending with Diatomaceous Earth

Carotenuto,

Cavallaro,

Chinnici

et al. 2024

Molecules

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In this work, diatomaceous earth (Diat) was explored as filler for polycaprolactone (PCL) to obtain composite green materials with promising viscoelastic and thermal properties. The composites were prepared by blending variable Diat amounts (5, 15 and 50 wt%) with a molten PCL matrix. The viscoelastic characteristics of PCL/Diat hybrids were studied by Dynamic Mechanical Analysis (DMA) under an oscillatory regime, while the thermal properties were determined by Differential Scanning Calorimetry (DSC) and Thermogravimetric Analysis (TGA). We detected that the presence of Diat enhances the energy storage capacity of PCL for temperatures lower than the polymer melting point. Both DMA and DSC data revealed that the PCL melting temperature is slightly affected by the Diat addition, while the TGA results showed that the thermal stability of the polymer can be significantly improved by mixing PCL with diatomaceous earth. Moreover, we observed that the dispersion of Diat into the matrix favors the crystallization process of PCL. Interestingly, the improvements of PCL properties (elasticity, thermal stability, and crystallinity) are proportional to the Diat concentration of the composites. These findings reflect the interfacial compatibility between PCL and diatomaceous earth. In conclusion, this study highlights that the preparation of PCL/Diat hybrids by melt blending is suitable for the development of composite materials for technological applications, including the remediation of air pollutants within museum environments.

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Section: Methodsmentioning

confidence: 99%

Hybrid Green Materials Obtained by PCL Melt Blending with Diatomaceous Earth

Carotenuto,

Cavallaro,

Chinnici

et al. 2024

Molecules

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“…Thermogravimetric analysis was used to determine the organic mass from sample CoFe 2 O 4 TD and the ferromagnetic Curie temperature for all the samples using a TA instruments SDT 650 simultaneous thermal analyzer under a nitrogen flux of 5 mL/min, from room temperature up to 800 °C. A permanent magnet (B = 50 Oe) was placed on top to reduce the weight of the sample by 2-5%, recording both heating and cooling data [18]. To assure the adsorbed water or other organic components at the surface of the nanoparticles do not contribute to the recorded signals producing errors in the estimated Curie temperature of the samples, the measurements were repeated for the TG and DSC immediately after finishing the first ones, keeping all parameters the same.…”

Section: Characterizationmentioning

confidence: 99%

Variations in magnetic properties caused by size dispersion and particle aggregation on CoFe2O4

Arteaga-Cardona

Aguilar

Estevez³

et al. 2019

SN Appl. Sci.

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Size dispersion and particle aggregation are the key parameters that affect the magnetic properties at nanoscale due to interparticle interactions. However, few efforts have been devoted so far to understand how these parameters affect the magnetic properties of nanoparticles. Here, we experimentally demonstrate how the magnetic properties such as magnetic saturation (M s ), coercivity (H c ), Curie temperature (T c ), and blocking temperature (T B ) of cobalt ferrite (CoFe 2 O 4 ) nanoparticles having the same composition and near-average size are affected by size dispersion (σ) and aggregation. Cobalt ferrite nanoparticles of similar average sizes but different size dispersions and aggregations were fabricated through different synthesis routes. The results clearly demonstrate that just by reducing the size dispersion and aggregation, it is possible to modify the magnetic properties, e.g., achieving a superparamagnetic state of cobalt ferrite even under applied magnetic field as low as 100 Oe as indicated by ZFC measurements. The Stoner-Wohlfarth model with thermal agitation was used to simulate the blocking temperature of the different size dispersion and aggregation nanoparticles confirming that low size dispersion and nonaggregated particles have great influence to achieve the superparamagnetic state, especially for high coercivity materials such as cobalt ferrite.

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“…Among these elements, Co leads to the largest increase of Young's modulus, and Voigt shear modulus [11]. A very high Curie temperature of 857 • C was also found in the Fe 2 CoAl compound [12]. In the previous study, quantum-mechanical calculations were used to investigate properties of four different polymorphs of Fe 2 AlCo and the occurrence of structural multiplicity at elevated temperatures was predicted [13].…”

Section: Introductionmentioning

confidence: 98%

Creep of Heusler-Type Alloy Fe-25Al-25Co

2020

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Creep of an alloy based on the intermetallic compound Fe2AlCo was studied by compressive creep tests in the temperature range from 873 to 1073 K. The stress exponent n and the activation energy of creep Q were determined using the multivariable regression of the creep-rate data and their description by means of sinh equation (Garofalo equation). The evaluated stress exponents indicate that the dislocation climb controls creep deformation. The estimated apparent activation energies for creep are higher than the activation enthalpy for the diffusion of Fe in Fe3Al. This can be ascribed to the changes in crystal lattice and changing microstructure of the alloy.

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Curie temperature determination via thermogravimetric and continuous wavelet transformation analysis

Cited by 16 publications

References 26 publications

Hybrid Green Materials Obtained by PCL Melt Blending with Diatomaceous Earth

Hybrid Green Materials Obtained by PCL Melt Blending with Diatomaceous Earth

Variations in magnetic properties caused by size dispersion and particle aggregation on CoFe2O4

Creep of Heusler-Type Alloy Fe-25Al-25Co

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