Remote-controlled activation of self-healing behavior in magneto-responsive ionomeric composites

Hohlbein, N.; Shaaban, A.; Schmidt, Annette

doi:10.1016/j.polymer.2015.04.024

Cited by 68 publications

(55 citation statements)

References 50 publications

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“…This conforms with a macroscopic Kelvin-Voigt model [89,90] which predicts an imaginary component of the dynamic moduli linearly increasing with frequency. Similarly, experimental measurements of the loss moduli in polymeric materials [81,85,87,88] are compatible with a Kelvin-Voigt model [i.e. constant storage part and linearly increasing loss part of E αα (ω) and G αβ (ω)] in the low-frequency regime.…”

Section: B Dynamic Modulisupporting

confidence: 69%

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Dynamic elastic moduli in magnetic gels: Normal modes and linear response

Pessot

Löwen

Menzel

2016

The Journal of Chemical Physics

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In the perspective of developing smart hybrid materials with customized features, ferrogels and magnetorheological elastomers allow a synergy of elasticity and magnetism. The interplay between elastic and magnetic properties gives rise to a unique reversible control of the material behavior by applying an external magnetic field. Albeit few works have been performed on the time-dependent properties so far, understanding the dynamic behavior is the key to model many practical situations, e.g., applications as vibration absorbers. Here we present a way to calculate the frequency-dependent elastic moduli based on the decomposition of the linear response to an external stress in normal modes. We use a minimal three-dimensional dipole-spring model to theoretically describe the magnetic and elastic interactions on the mesoscopic level. Specifically, the magnetic particles carry permanent magnetic dipole moments and are spatially arranged in a prescribed way, before they are linked by elastic springs. An external magnetic field aligns the magnetic moments. On the one hand, we study regular lattice-like particle arrangements to compare with previous results in the literature. On the other hand, we calculate the dynamic elastic moduli for irregular, more realistic particle distributions. Our approach measures the tunability of the linear dynamic response as a function of the particle arrangement, the system orientation with respect to the external magnetic field, as well as the magnitude of the magnetic interaction between the particles. The strength of the present approach is that it explicitly connects the relaxational modes of the system with the rheological properties as well as with the internal rearrangement of the particles in the sample, providing new insight into the dynamics of these remarkable materials.

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Section: B Dynamic Modulisupporting

confidence: 69%

“…Such an effect would result in a significant drop of the elastic moduli at frequencies close to the resonances of those modes that contribute most to the linear response. This behavior, however, is not obvious from experimental reports [85][86][87][88], thus supporting the overdamped approach. Eq.…”

Section: Dynamicsmentioning

confidence: 84%

Dynamic elastic moduli in magnetic gels: Normal modes and linear response

Pessot

Löwen

Menzel

2016

The Journal of Chemical Physics

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“…The concept of "local" self-healing, for which nanoparticles play a crucial role, is actually broader than merely graphene and DA. The fact that heat can be generated locally renders the crosslinking kinetics faster [49] also in the case of ionic interactions and magnetic nanoparticles.…”

Section: Nanocomposites -Recent Evolutionsmentioning

confidence: 99%

Thermoreversible Polymeric Nanocomposites

Bose¹,

Picchioni²,

Muljana³

2019

Nanocomposites - Recent Evolutions

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Polymeric nanocomposites are widely used in applications such as structural materials, electronics, energy, and biomedical as they synergistically combine the desired properties of the filler and the polymer. The emergent properties can be designed and tuned based not only on the choice of filler and polymer but also on the type of bond and interface created between the two components. When the bond between the two is covalent, the nanocomposites have superior mechanical characteristics. When this covalent bond is reversible, a combination of high impact resistance and high tensile strength is achieved. A well-known approach to achieve these reversible covalent bonds is via the Diels-Alder reaction between a diene and a dienophile. At elevated temperatures, the retro Diels-Alder reaction is dominant resulting in bond cleavage. This chapter reviews the different strategies involving Diels-Alder reactions at the polymer-filler interface. Various fillers have been researched including silica, carbon nanotubes, and graphene, which impart different mechanical and conductive properties to the nanocomposite. A variety of polymer matrices have been reported by various researchers and are summarized here. The choice of diene and dienophile influences the rate of reversible reaction and thus the final properties as will be discussed.

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“…Here, the magnetic nano-particles of different size, shape and composition were employed to act as nano-heaters, driven by a high-frequency AMF. This on-demand effect required very short times in order to 'self-heal' the elastomer, restoring its original shape [77].…”

Section: Magneto-induced Actuationmentioning

confidence: 99%

Stimuli-Controlled Fluid Control and Microvehicle Movement in Microfluidic Channels

Dunne¹,

Francis²,

Delaney³

et al. 2017

Reference Module in Materials Science and Materials Engineering

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Integration of stimuli-responsive materials into microfluidic systems provides a means to locally manipulate flow at the microscale, in a non-invasive manner, while also reducing system complexity. In recent years, several modes of stimulation have been applied, including electrical, magnetic, light and temperature, among others. To achieve remote control of flow in microfluidics using external stimulation, two main approaches have emerged in the recent years: 1. Control of flow through stimuli-induced actuation of microfluidic components (valves, pumps, mixers, flow sorters), most often fabricated from soft polymeric materials; 2. Stimuli-controlled manipulation of discrete micrometer-sized "vehicles" (droplets, beads, Janus particles, etc.) through localized induced changes in wettability or surface tension.The focus of this chapter will be to identify and compare the similarities and underlying mechanisms employed in the current state of the art research in stimuli-controlled fluid control and micro-vehicle movement fields. It will also endeavor to propose possible directions for the evolution of these areas of research.

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Remote-controlled activation of self-healing behavior in magneto-responsive ionomeric composites

Cited by 68 publications

References 50 publications

Dynamic elastic moduli in magnetic gels: Normal modes and linear response

Dynamic elastic moduli in magnetic gels: Normal modes and linear response

Thermoreversible Polymeric Nanocomposites

Stimuli-Controlled Fluid Control and Microvehicle Movement in Microfluidic Channels

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