Particles that slide over the water surface: Synthesis and characterization of iron oxides particles coated with PDMS, with hydrophobic and magnetic properties

Neto, Francisco N.de Souza; Araújo, Olacir Alves; Guilherme, Luciana Rebelo; Garg, V. K.; Oliveira, A. C.; Souza, Paulo Eduardo Narcizo de; Júnior, Álvaro Ferreira

doi:10.1016/j.matchemphys.2015.05.014

Cited by 11 publications

(4 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Of all the tested MRE specimens, no absorption was found at 560–570 cm −1 , which should be the iron oxide or Fe–O absorption region [ 38 , 39 ]. This behavior is called a Binder bond [ 40 ].…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Declining Performance of Silicone-Based Magnetorheological Elastomers after Accelerated Weathering

et al. 2021

View full text Add to dashboard Cite

Magnetorheological elastomers (MRE)-based products are usually located in an area directly exposed to sunlight and rain. However, there is no specific research on the behavior of MRE after accelerated weathering. Therefore, in this study, the changes to the chemical and rheological properties of both isotropic and anisotropic MRE after accelerated weathering were examined. Treated and untreated specimens were compared. MRE specimens with 40% by weight CIP were prepared with no current excitation and another sample was prepared with 1.5 T of magnetic flux density. Each specimen was treated in an accelerated weathering machine, Q-Sun Xe-1 Xenon Test Chamber, under a UV light exposure cycle and water spray. A material characterization was carried out using FTIR and a rheometer to determine the changes to the chemical and rheological properties. The morphological analysis results showed that after the weather treatment, the surface was rough and more cavities occurred. The rheometer test results showed a significant decrease in the storage modulus of each treated MRE specimen, unlike the untreated MRE specimens. The decrease in the storage modulus value with currents of 0, 1, 2, and 3 Amperes was 66.67%, 78.9%, 85.2%, and 80.5%, respectively. Meanwhile, FTIR testing showed a change in the wave peak between the untreated and treated MRE specimens. Thermogravimetric analysis (TGA) also showed a decrease in MRE weight for each specimen. However, for both treated and untreated MRE specimens, the decrease in TGA was not significantly different. In all the tests carried out on the MRE samples, weather acceleration treatment caused significant changes. This is an important consideration for developers who choose silicone as the MRE matrix.

show abstract

Section: Resultsmentioning

confidence: 99%

“…This indicates that the OH group formed before the treated specimen faded due to the influence of UV exposure. Of all the tested MRE specimens, no absorption was found at 560-570 cm −1 , which should be the iron oxide or Fe-O absorption region [38,39]. This behavior is called a Binder bond [40].…”

Section: Ftir Testingmentioning

confidence: 99%

Declining Performance of Silicone-Based Magnetorheological Elastomers after Accelerated Weathering

et al. 2021

View full text Add to dashboard Cite

show abstract

“…Of all tested MRE specimens, no absorption was found at 560-570 cm-1 which should be the iron oxide or Fe-O absorption region [38,39]. This behavior is called a Binder bond [40].…”

Section: Fig 34 Ftir Results Characterizationmentioning

confidence: 99%

Performance Degradation of Silicon Based Magnetorheological Elastomer Under Accelerated Weathering Treatment

Wibowo¹,

Lenggana²,

Ubaidillah³

et al. 2020

Preprint

View full text Add to dashboard Cite

Silicone RTV-based engineering rubber composite products have been widely used for several applications in various fields as a major component such as structure, automotive, and medical. In its application, the rubber composite product is placed in an open area that is directly exposed to sunlight and rain. It has a significant negative impact on changes in chemical and rheological properties, making the product life of rubber composite products shorter. Therefore, in this study, changes in the chemical and rheological properties of both isotropic and anisotropic magnetorheological elastomer (MRE) treated with accelerated weathering were studied compared to untreated specimens with specimens that had been treated. MRE specimens with 40% by weight CIP were prepared with no current excitation and another sample were made under 1.5 T of magnetic flux density. Each specimen was treated in an accelerated weathering machine Q-Sun Xe-1 Xenon Test Chamber with a UV light exposure cycle for 102 minutes and 18 minutes of UV light combined with water spray for 24 hours followed by a condensation cycle of 4 hours in a dark period. Material characterization was carried out using FTIR and Rheometer to determine the changes in chemical and rheological properties. The morphological analysis results showed that the surface was rough and more cavities occurred after being given weather treatment. Rheometer test results showed a decrease in storage modulus in each MRE specimen that had been treated compared to untreated MRE specimens. Meanwhile, FTIR testing showed a change in wave peak between untreated and treated MRE specimens.

show abstract

“…A sharp peak at 789 cm −1 corresponds to the asymmetric stretching and bending vibration modes of Si-H. Also, a tiny band at 864 cm −1 is attributed to Si-OH bonds [29,31,32]. At the value of 1257 cm −1 , the Si-C in Si-CH 3 stretching vibration mode is found [33]. Finally, the short peaks at 1412, 1445, and 2905-2962 cm −1 correspond to Si-CH=CH 2 vibration, C-H bending in -Si-CH 2 , and CH 2 stretching in Si-CH 2 - [31,34].…”

Section: Chemical Analysis By Ftir Spectroscopymentioning

confidence: 99%

Magnetic and Viscoelastic Response of Magnetorheological Elastomers Based on a Combination of Iron Nano- and Microparticles

Perales-Martínez,

Palacios-Pineda,

Elías-Zúñiga

et al. 2023

Polymers

View full text Add to dashboard Cite

In this paper, we discuss the creation of a hybrid magnetorheological elastomer that combines nano- and microparticles. The mixture contained 45 wt.% fillers, with combinations of either 0% nanoparticles and 100% microparticles or 25% nanoparticles and 75% microparticles. TGA and FTIR testing confirmed the materials’ thermal and chemical stability, while an SEM analysis determined the particles’ size and morphology. XRD results were used to determine the crystal size of both nano- and microparticles. The addition of reinforcing particles, particularly nanoparticles, enhanced the stiffness of the composite materials studied, but their overall strength was only minimally affected. The computed interaction parameter relative to the volume fraction was consistent with the previous literature. Furthermore, the study observed a magnetic response increment in composite materials reinforced with nanoparticles above 30 Hz. The isotropic material containing only microparticles had a lower storage modulus than the isotropic sample with nanoparticles without a magnetic field. However, when a magnetic field was applied, the material with only microparticles exhibited a higher storage modulus than the samples with nanoparticles.

show abstract

Particles that slide over the water surface: Synthesis and characterization of iron oxides particles coated with PDMS, with hydrophobic and magnetic properties

Cited by 11 publications

References 42 publications

Declining Performance of Silicone-Based Magnetorheological Elastomers after Accelerated Weathering

Declining Performance of Silicone-Based Magnetorheological Elastomers after Accelerated Weathering

Performance Degradation of Silicon Based Magnetorheological Elastomer Under Accelerated Weathering Treatment

Magnetic and Viscoelastic Response of Magnetorheological Elastomers Based on a Combination of Iron Nano- and Microparticles

Contact Info

Product

Resources

About