Goethite nanorods as a cheap and effective filler for siloxane nanocomposite elastomers

Iacob, Mihail; Stiubianu, George; Tugui, Codrin; Ursu, Laura; Ignat, Maria; Turta, Constantin; Cazacu, Maria

doi:10.1039/c5ra03765d

Cited by 16 publications

(21 citation statements)

References 17 publications

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“…The traditional choice of fillers for silicones is silica particles, due to their inherent compatibility. These fillers can eithervia the simplest processbe blended directly into one or both of the elastomer premixes [33][34][35][36][37][38][39][40][41][42] or alternativelyvia the more demanding processincorporated through in situ condensation reactions during the crosslinking condensation reaction, [43,44] therebyin both casesyielding a morphology, as illustrated in Figure 2. [32] Silica, however, does not contribute positively to the dielectric permittivity of the resulting elastomer, since the relative permittivities of silica and silicone are similar.…”

Section: Traditional Composite Systemsmentioning

confidence: 99%

“…[33] Therefore, high-permittivity fillers such as metal oxide fillers are required in order to meet the demand for enhanced dielectric elastomer energy density. These fillers can eithervia the simplest processbe blended directly into one or both of the elastomer premixes [33][34][35][36][37][38][39][40][41][42] or alternativelyvia the more demanding processincorporated through in situ condensation reactions during the crosslinking condensation reaction, [43,44] therebyin both casesyielding a morphology, as illustrated in Figure 2.…”

Section: Traditional Composite Systemsmentioning

confidence: 99%

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Optimization Techniques for Improving the Performance of Silicone‐Based Dielectric Elastomers

Skov

2017

Adv Eng Mater

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Dielectric elastomers are possible candidates for realizing products that are in high demand by society, such as soft robotics and prosthetics, tactile displays, and smart wearables. Diverse and advanced products based on dielectric elastomers are available; however, no elastomer has proven ideal for all types of products. Silicone elastomers, though, are the most promising type of elastomer when viewed from a reliability perspective, since in normal conditions they do not undergo any chemical degradation or mechanical ageing/relaxation. Within this review, different pathways for improving the electro-mechanical performance of dielectric elastomers are highlighted. Various optimization methods for improved energy transduction are investigated and discussed, with special emphasis placed on the promise each method holds. The compositing and blending of elastomers are shown to be simple, versatile methods that can solve a number of optimization issues. More complicated methods, involving chemical modification of the silicone backbone as well as controlling the network structure for improved mechanical properties, are shown to solve yet more issues. From the analysis, it is obvious that there is not a single optimization technique that will lead to the universal optimization of dielectric elastomer films, though each method may lead to elastomers with certain features, and thus certain potentials.

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Section: Traditional Composite Systemsmentioning

confidence: 99%

Section: Traditional Composite Systemsmentioning

confidence: 99%

Optimization Techniques for Improving the Performance of Silicone‐Based Dielectric Elastomers

Skov

2017

Adv Eng Mater

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“…In the context of our preoccupations for the improvement of silicone performance for specific applications, especially as active elements in electromechanical devices, different fillers: organic (polyazometines) [20], inorganic (iron oxides [21,22], silver [23,24], barium titanate, [25,26] titanium dioxide [27,28],), organicinorganic (organosilesquioxanes [29,30]), etc were incorporated in silicone derivatives. In this paper, the effect of three REOs (Eu 2 O 3 , Gd 2 O 3 and Dy 2 O 3 ) as single fillers on the silicone behaviour was studied.…”

Section: Introductionmentioning

confidence: 99%

Silicone elastomers filled with rare earth oxides

Iacob¹,

Airinei²,

Asăndulesa³

et al. 2020

Mater. Res. Express

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Silicones which possess, amongst others, remarkable mechanical properties, thermal stability over a wide range of temperatures and processability, and rare earth oxides (REO), known for their unique optic, magnetic and catalytic properties can be coupled into multifunctional composite materials (S-REOs). In addition, the intrinsic hydrophobicity of REO and polysiloxanes makes them easily compatible without the need for surface treatments of the former. Thus, europium oxide (Eu 2 O 3 ), gadolinium oxide (Gd 2 O 3 ) and dysprosium oxide (Dy 2 O 3 ) in amounts of 20 pph are incorporated as fillers into silicone matrices, followed by processing mixture as thin films and crosslinking at room temperature. The analysis of the obtained films reveals the changes induced by these fillers in the thermal, mechanical, dielectric and optical properties, as well as the hydrophobicity of the silicones. The luminescence properties of S-REO composites were investigated by fluorescence spectra and lifetime -resolved measurements with a multiemission peaks from blue to greenish register. The thermogravimetrical analysis indicates an increasing of thermal stability of the composites that contain REO, compared to pure silicone. As expected, the dielectric permittivity significantly increased due to nature of the fillers, while the dielectric loss values are relatively low for all samples, indicating a minimal conversion of electrical energy in the form of heat within bulk composites. The presence of rare earth oxides into the silicone matrix facilitates the motions of long-range charge carriers through the network resulting in higher values of conductivity of the composite films. The stress-strain measurements revealed the reinforcing effect of the rare earth metal oxides on a silicone matrix, leading to a significant increase of Young modulus. The known hydrophobicity of silicones is further enhanced by the presence of REO.

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“…When it was found that materials formed from small particles exhibit different properties from their bulk form [2], numerous researchers became interested in discovering new properties and applications. Nanometer-sized iron oxides proved to be of interest in several fields such as medicine, applied physics, chemistry and engineering [3–6]. The interest in iron oxide nanoparticles and their use in an extremely large number of applications is motivated by stability, biocompatibility, magnetic properties and their availability.…”

Section: Introductionmentioning

confidence: 99%

“…Nanoparticles are also preferred as fillers for polymers to induce certain properties upon the resulting composites. The effect will be greater as the particle size is reduced and their dimensional ratio is increased, resulting in a higher matrix–filler contact surface [6]. Therefore, establishing methods for preparing nanoparticles of iron oxide with predetermined dimensional characteristics and morphology is an important task for scientists.…”

Section: Introductionmentioning

confidence: 99%

From iron coordination compounds to metal oxide nanoparticles

Iacob¹,

Racleş²,

Tugui³

et al. 2016

Beilstein J. Nanotechnol.

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Various types, shapes and sizes of iron oxide nanoparticles were obtained depending on the nature of the precursor, preparation method and reaction conditions. The mixed valence trinuclear iron acetate, [Fe2 IIIFeIIO(CH3COO)6(H2O)3]·2H2O (FeAc1), μ3-oxo trinuclear iron(III) acetate, [Fe3O(CH3COO)6(H2O)3]NO3∙4H2O (FeAc2), iron furoate, [Fe3O(C4H3OCOO)6(CH3OH)3]NO3∙2CH3OH (FeF), iron chromium furoate, FeCr2O(C4H3OCOO)6(CH3OH)3]NO3∙2CH3OH (FeCrF), and an iron complex with an original macromolecular ligand (FePAZ) were used as precursors for the corresponding oxide nanoparticles. Five series of nanoparticle samples were prepared employing either a classical thermal pathway (i.e., thermal decomposition in solution, solvothermal method, dry thermal decomposition/calcination) or using a nonconventional energy source (i.e., microwave or ultrasonic treatment) to convert precursors into iron oxides. The resulting materials were structurally characterized by wide-angle X-ray diffraction and Fourier transform infrared, Raman, energy-dispersive X-ray, and X-ray fluorescence spectroscopies, as well as thermogravimetric analysis. The morphology was characterized by transmission electron microscopy, atomic force microscopy and dynamic light scattering. The parameters were varied within each route to fine tune the size and shape of the formed nanoparticles.

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Goethite nanorods as a cheap and effective filler for siloxane nanocomposite elastomers

Abstract: Composites based on PDMS and goethite nanorods are for the first time approached from the perspective of dielectric elastomers.

Cited by 16 publications

References 17 publications

Optimization Techniques for Improving the Performance of Silicone‐Based Dielectric Elastomers

Optimization Techniques for Improving the Performance of Silicone‐Based Dielectric Elastomers

Silicone elastomers filled with rare earth oxides

From iron coordination compounds to metal oxide nanoparticles

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