Effects of particle distribution on mechanical properties of magneto-sensitive elastomers in a homogeneous magnetic field

Ivaneyko, Dmytro; Toshchevikov, Vladimir; Saphiannikova, Marina; Heinrich, Gert

doi:10.5488/cmp.15.33601

Cited by 111 publications

(142 citation statements)

References 34 publications

(45 reference statements)

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“…Figure 4 shows the experimentally measured magnetization as a function of the applied magnetic field, μ0H, for slab samples S1-S6 at 300 K. None of them shows either coercitivity or remanence, which is indicative of their superparamagnetic behavior. Actually, this is in agreement with the superparamagnetic nature of the Fe3O4 nanoparticles at room temperature (Ivaneyko et al, 2012). On the same figure, the saturation magnetization (ms) (understood as the total magnetization corresponding to an applied field of 1.2 T) for each sample is included.…”

Section: Biocompatibilitysupporting

confidence: 77%

Characterization of Ferrofluid-Based Stimuli-Responsive Elastomers

et al. 2016

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Stimuli-responsive materials undergo physicochemical and/or structural changes when a specific actuation is applied. They are heterogeneous composites, consisting of a non-responsive matrix where functionality is provided by the filler. Surprisingly, the synthesis of polydimethylsiloxane (PDMS)-based stimuli-responsive elastomers (SRE) has seldomly been presented. Here, we present the structural, biological, optical, magnetic, and mechanical properties of several magnetic SRE (M-SRE) obtained by combining PDMS and isoparafin-based ferrofluid (FF). Independently of the FF concentration, results have shown a similar aggregation level, with the nanoparticles mostly isolated (>60%). In addition to the superparamagnetic behavior, the samples show no cytotoxicity except the sample with the highest FF concentration. Spectral response shows FF concentrations where both optical readout and magnetic actuation can simultaneously be used. The Young's modulus increases with the FF concentration until the highest FF concentration is used. Our results demonstrate that PDMS can host up to 24.6% FF (corresponding to 2.8% weight of Fe3O4 nanoparticles concentration). Such M-SRE are used to define microsystems -also called soft microsystems due to the use of soft materials as main mechanical structures. In that scenario, a large displacement for relatively low magnetic fields (<0.3 T) is achieved. The herein presented M-SRE characterization can be used for a large number of disciplines where magnetic actuation can be combined with optical detection, mechanical elements, and biological samples.

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Section: Biocompatibilitysupporting

confidence: 77%

Characterization of Ferrofluid-Based Stimuli-Responsive Elastomers

et al. 2016

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“…One prospective application of such materials is their use as soft actuators [22][23][24][25]. For instance, external magnetic or electric fields may induce interactions between the inclusions and lead to overall distortions [26][27][28][29][30][31][32][33][34], or net forces are imposed onto the inclusions when they are drawn into an external magnetic field gradient [35]. Our situation corresponds to the contact area where the composite material is placed on a suitable substrate.…”

Section: Introductionmentioning

confidence: 99%

Force-induced elastic matrix-mediated interactions in the presence of a rigid wall

Menzel

2017

Soft Matter

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We consider an elastic composite material containing particulate inclusions in a soft elastic matrix that is bounded by a rigid wall, e.g., the substrate. If such a composite serves as a soft actuator, forces are imposed on or induced between the embedded particles. We investigate how the presence of the rigid wall affects the interactions between the inclusions in the elastic matrix. For noslip boundary conditions, we transfer Blake's derivation of a corresponding Green's function from low-Reynolds-number hydrodynamics to the linearly elastic case. Results for no-slip and free-slip surface conditions are compared to each other and to the bulk behavior. Our results suggest that walls with free-slip surface conditions are preferred when they serve as substrates for soft actuators made from elastic composite materials. As we further demonstrate, the presence of a rigid wall can qualitatively change the interactions between the inclusions. In effect, it can switch attractive interactions into repulsive ones (and vice versa). It should be straightforward to observe the effects in future experiments and to combine our results, e.g., with the modeling of biological cells and tissue on rigid surfaces.

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“…From Eqs. (8), (14), and (24) it then follows thatÃ =T =C = 0 and δs 0 = δφ 0 = Γ rr,0 = Γ ϑϑ,0 = 0. Finally, we find for the remaining order n = 0 the following system of linear equations:…”

Section: Two-fluid Description Including Thermophoretic Effectsmentioning

confidence: 93%

“…One such example are soft magnetic gels [4][5][6] , where magnetic colloidal particles 7,8 are embedded into soft elastic environments. The result are soft elastic materials, the mechanical properties of which, such as the dynamic behavior 4,9-11 , elastic moduli 4,5,[12][13][14][15][16][17] , or nonlinear stress-strain behavior 18 , can be reversibly tuned and switched from outside.…”

Section: Introductionmentioning

confidence: 99%

Thermophoretically induced large-scale deformations around microscopic heat centers

Puljiz

Orlishausen

Menzel

2016

The Journal of Chemical Physics

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Selectively heating a microscopic colloidal particle embedded in a soft elastic matrix is a situation of high practical relevance. For instance, during hyperthermic cancer treatment, cell tissue surrounding heated magnetic colloidal particles is destroyed. Experiments on soft elastic polymeric matrices suggest a very long-ranged, non-decaying radial component of the thermophoretically induced displacement fields around the microscopic heat centers. We theoretically confirm this conjecture using a macroscopic hydrodynamic two-fluid description. Both, thermophoretic and elastic effects are included in this theory. Indeed, we find that the elasticity of the environment can cause the experimentally observed large-scale radial displacements in the embedding matrix. Additional experiments confirm the central role of elasticity. Finally, a linearly decaying radial component of the displacement field in the experiments is attributed to the finite size of the experimental sample. Similar results are obtained from our theoretical analysis under modified boundary conditions.

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Effects of particle distribution on mechanical properties of magneto-sensitive elastomers in a homogeneous magnetic field

Cited by 111 publications

References 34 publications

Characterization of Ferrofluid-Based Stimuli-Responsive Elastomers

Characterization of Ferrofluid-Based Stimuli-Responsive Elastomers

Force-induced elastic matrix-mediated interactions in the presence of a rigid wall

Thermophoretically induced large-scale deformations around microscopic heat centers

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