Bending of multilayer nanomembranes

Drozdov, Aleksey D.; Christiansen, Jesper de Claville

doi:10.1016/j.compstruct.2017.09.053

Cited by 6 publications

(6 citation statements)

References 47 publications

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“…It requires comprehensive numerical analyses of the effect of various parameters, e.g. thermal contact resistance between filler–filler and filler–polymer matrix, local clustering, and wrinkling and folding of graphene fillers . A complete theoretical description is beyond the scope of this experimental study.…”

Section: Resultsmentioning

confidence: 99%

Thermal Properties of the Binary‐Filler Hybrid Composites with Graphene and Copper Nanoparticles

Barani

Mohammadzadeh

Geremew

et al. 2019

Adv Funct Materials

199

148

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The thermal properties of epoxy‐based binary composites comprised of graphene and copper nanoparticles are reported. It is found that the “synergistic” filler effect, revealed as a strong enhancement of the thermal conductivity of composites with the size‐dissimilar fillers, has a well‐defined filler loading threshold. The thermal conductivity of composites with a moderate graphene concentration of fg = 15 wt% exhibits an abrupt increase as the loading of copper nanoparticles approaches fCu ≈ 40 wt%, followed by saturation. The effect is attributed to intercalation of spherical copper nanoparticles between the large graphene flakes, resulting in formation of the highly thermally conductive percolation network. In contrast, in composites with a high graphene concentration, fg = 40 wt%, the thermal conductivity increases linearly with addition of copper nanoparticles. A thermal conductivity of 13.5 ± 1.6 Wm−1K−1 is achieved in composites with binary fillers of fg = 40 wt% and fCu = 35 wt%. It has also been demonstrated that the thermal percolation can occur prior to electrical percolation even in composites with electrically conductive fillers. The obtained results shed light on the interaction between graphene fillers and copper nanoparticles in the composites and demonstrate potential of such hybrid epoxy composites for practical applications in thermal interface materials and adhesives.

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Section: Resultsmentioning

confidence: 99%

Thermal Properties of the Binary‐Filler Hybrid Composites with Graphene and Copper Nanoparticles

Barani

Mohammadzadeh

Geremew

et al. 2019

Adv Funct Materials

199

148

View full text Add to dashboard Cite

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“…Researchers combine two or more hydrogel layers with different mechanical and swelling properties in a spatially predefined sequence and orientation . An example is the pairing of an active soft hydrogel layer capable of swelling with a relatively stiff passive layer with relatively nonswelling characteristics . Upon activation, the soft swelling hydrogel starts to undergo isotropic volumetric expansion or contraction while the stiff hydrogel acts as a structural constraint opposing the active hydrogel layer.…”

Section: Principlesmentioning

confidence: 99%

Transformer Hydrogels: A Review

Erol

Pantula

Liu

et al. 2019

Adv Materials Technologies

219

201

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Hydrogels, which are hydrophilic soft porous networks, are an important class of materials of broad relevance to bioanalytical chemistry, soft‐robotics, drug delivery, and regenerative medicine. Transformer hydrogels are micro‐ and mesostructured hydrogels that display a dramatic transformation of shape, form, or dimension with associated changes in function, due to engineered local variations such as in swelling or stiffness, in response to external controls or environmental stimuli. This review describes principles that can be utilized to fabricate transformer hydrogels such as by layering, patterning, or generating anisotropy, and gradients. Transformer hydrogels are classified based on their responsivity to different stimuli such as temperature, electromagnetic fields, chemicals, and biomolecules. A survey of the current research progress suggests applications of transformer hydrogels in biomimetics, soft robotics, microfluidics, tissue engineering, drug delivery, surgery, and biomedical engineering.

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“…Additionally, during the relaxation process, the tip of the bilayer shows a distinct difference in swelling in both experiments and simulations, which again confirms the predominant buildup of stress at the interface of the two layers due to different swelling ratios (see circle highlight in Figure 3d). Since the whole concept of hydrogel bilayer bending requires the buildup of different swelling degrees at comparable mechanical stiffness of both layers, [17,27] the relaxation confirms the loss of mechanical consistency in the mechano‐immolative layer.…”

Section: Figurementioning

confidence: 81%

“…We hypothesized that the rapid swelling of the PE layer would dominate the swelling of the system and that the resulting bending would induce sufficient force to initiate the mechano‐immolation that would eventually destroy the mechano‐immolative gel layer. This in turn would remove the bilayer geometry needed for actuation itself [17,27] …”

Section: Figurementioning

confidence: 99%

Mechano‐Activated Self‐Immolation of Hydrogels via Signal Amplification

et al. 2023

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Cellular organisms possess intricate mechano‐adaptive systems that enable them to sense forces and process them with (bio)chemical circuits for functional adaptation. Inspired by such processes, this study introduces a hydrogel system capable of mechanically activated and chemically transduced self‐destruction. Our judiciously designed hydrogels can mechanically generate radicals that are processed and amplified in a self‐propagating radical de‐crosslinking reaction, ultimately leading to mechanically triggered self‐immolation. We put such systems to work in mechano‐induced debonding, and in a bilayer actuator, where swelling‐induced bending generates sufficient force for selective degradation of one layer, leading to autonomous self‐regulation associated with unbending. Our work helps define design criteria for molecularly controlled adaptive and self‐regulating materials with embodied mechano‐chemical information processing, and showcases their potential for adhesives and soft robotics.

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Bending of multilayer nanomembranes

Cited by 6 publications

References 47 publications

Thermal Properties of the Binary‐Filler Hybrid Composites with Graphene and Copper Nanoparticles

Thermal Properties of the Binary‐Filler Hybrid Composites with Graphene and Copper Nanoparticles

Transformer Hydrogels: A Review

Mechano‐Activated Self‐Immolation of Hydrogels via Signal Amplification

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