Characterization of a magnetic hybrid film fabricated by the in-situ synthesis of iron oxide nanoparticles into ethyl cellulose polymer

Puente-Córdova, Jesús Gabino; Melo, Martín Édgar Reyes; López-Walle, Beatriz; Miranda-Valdez, Isaac Yair; Torres–Castro, Alejandro

doi:10.1007/s10570-022-04528-3

Cited by 8 publications

(7 citation statements)

References 44 publications

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“…Figure 2d illustrated that the specific saturation magnetization (Ms) of the nanocomposites were 60.99 emu/g. With the decrease of the applied magnetic field, since all the spins can be restored to the original direction, the magnetization curve has no hysteresis, no remanence (remanence) and no coercivity, so the Fe 3 O 4 @HPMC exhibits superparamagnetism [13] …”

Section: Resultsmentioning

confidence: 99%

Temperature‐Sensitive Properties and Mechanism of Smart Magnetic Fluids Modified with Cellulose Derivatives

Yang,

Jiang,

Duan

et al. 2023

ChemistrySelect

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Combining magnetic materials with environmentally sensitive polymers to develop intelligent magnetic fluids that respond to external stimuli has become a new research hotspot. At present, the bottlenecks in the development of temperature‐sensitive materials are the complex composition, and its properties in different laboratories vary greatly. Moreover, despite extensive research on magnetic fluids, there remains a dearth of systematic investigation into temperature‐sensitive intelligent magnetic fluids. In this study, we utilized a UV‐visible spectrophotometer to measure the change in transmittance of different magnetic fluid solutions with temperature variation. We systematically investigated the effects of the magnetic fluid dispersion medium, size and concentration of magnetic nanoparticles, type and viscosity of cellulose on the temperature sensitivity of the magnetic fluid. We found that compared with Hydroxypropyl Methyl Cellulose (HPMC) (type I), HPMC (type II) modified magnetic fluid has better stability and a higher phase transition temperature. Moreover, with the increase of the concentration of magnetic fluid, the phase transition temperature is higher. In addition, the lower the viscosity of HPMC‐modified magnetic fluid, the better the stability and the higher the phase transition temperature. We also studied the mechanism of temperature sensitivity, and the results showed that hydrogen bond interactions play an important role. This research will facilitate the use of temperature‐sensitive smart magnetic fluids for biomedical application.

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Section: Resultsmentioning

confidence: 99%

Temperature‐Sensitive Properties and Mechanism of Smart Magnetic Fluids Modified with Cellulose Derivatives

Yang,

Jiang,

Duan

et al. 2023

ChemistrySelect

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“…The viscoelastic response of the EC was analyzed by DMA, using a Perkin Elmer DMA8000 (Waltham, MA, USA), under isochronous conditions (0.1, 1 and 10 Hz), in tension mode, with a heating ramp of 2 K/min, from 298 to 453 K [ 8 ]. EC was analyzed by X-ray diffraction (XRD) to determine the presence of amorphous or crystalline phases.…”

Section: Methodsmentioning

confidence: 99%

“…The properties of the resulting EC will depend on the degree of substitution of the ethyl ether group. Among the diverse types of EC synthesized, the most used in industrial sectors is that with a degree of ethyl ether substitution between 2.4 and 2.5 [ 2 , 8 ]. This substitution degree provides important properties, for example, water resistance and solubility in polar and non-polar solvents, and certain azeotropic mixtures.…”

Section: Introductionmentioning

confidence: 99%

Electrical Conduction Mechanisms in Ethyl Cellulose Films under DC and AC Electric Fields

Puente-Córdova,

Luna-Martínez,

Mohamed-Noriega

et al. 2024

Polymers

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This work reports the dielectric behavior of the biopolymer ethyl cellulose (EC) observed from transient currents experiments under the action of a direct current (DC) electric field (~107 V/m) under vacuum conditions. The viscoelastic response of the EC was evaluated using dynamic mechanical analysis (DMA), observing a mechanical relaxation related to glass transition of around ~402 K. Furthermore, we propose a mathematical framework that describes the transient current in EC using a fractional differential equation, whose solution involves the Mittag–Leffler function. The fractional order, between 0 and 1, is related to the energy dissipation rate and the molecular mobility of the polymer. Subsequently, the conduction mechanisms are considered, on the one hand, the phenomena that occur through the polymer–electrode interface and, on the other hand, those which manifest themselves in the bulk material. Finally, alternating current (AC) conductivity measurements above the glass transition temperature (~402 K) and in a frequency domain from 20 Hz to 2 MHz were carried out, observing electrical conduction described by the segmental movements of the polymeric chains. Its electrical properties also position EC as a potential candidate for electrical, electronics, and mechatronics applications.

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“…Considering this knowledge, in this study we investigate the thermal and dielectric response of polyvinyl butyral (PVB). We are interested in this polymer due to its potential applications, such as for hybrid magnetic materials and nanocomposites, another topic of our research group [ 16 , 17 , 18 ]. PVB is a polyacetal considered as an amorphous random copolymer with viscoelastic properties and optical clarity, suitable for use in the manufacture of safety glass laminates, especially in automotive and architectural glass [ 19 , 20 ].…”

Section: Introductionmentioning

confidence: 99%

Dielectric and Viscoelastic Behavior of Polyvinyl Butyral Films

Puente-Córdova,

Rentería-Baltiérrez,

López-Walle

et al. 2023

Polymers

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Dielectric and thermal properties of polyvinyl butyral (PVB) were studied in this work, using dynamic electrical analysis (DEA) at frequencies from 100 Hz to 1 MHz and temperatures from 293 K to 473 K. Two electrical relaxation processes were investigated: glass transition and interfacial polarization. Above the glass transition temperature (~343 K), interfacial polarization dominates conductive behavior in polyvinyl butyral. The framework of the complex electric modulus was used to obtain information about interfacial polarization. The viscoelastic behavior was analyzed through dynamic mechanical analysis (DMA), where only the mechanical manifestation of the glass transition is observed. The experimental results from dielectric measurements were analyzed with fractional calculus, using a fractional Debye model with one cap-resistor. We were successful in applying the complex electric modulus because we had a good correlation between data and theoretical predictions. The fractional order derivative is an indicator of the energy dissipated in terms of molecular mobility, and the calculated values close to 1 suggest a conductive behavior at temperatures above the glass transition temperature of PVB.

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Characterization of a magnetic hybrid film fabricated by the in-situ synthesis of iron oxide nanoparticles into ethyl cellulose polymer

Cited by 8 publications

References 44 publications

Temperature‐Sensitive Properties and Mechanism of Smart Magnetic Fluids Modified with Cellulose Derivatives

Temperature‐Sensitive Properties and Mechanism of Smart Magnetic Fluids Modified with Cellulose Derivatives

Electrical Conduction Mechanisms in Ethyl Cellulose Films under DC and AC Electric Fields

Dielectric and Viscoelastic Behavior of Polyvinyl Butyral Films

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