Enhanced dielectric properties and actuated strain of elastomer composites with dopamine-induced surface functionalization

Improving the electromechanical performance of dielectric elastomers using silicone rubber and dopamine coated barium titanate

“…As can be seen from the figure, some serious agglomeration of BT particles were exposed on the fractured surfaces of the compound. This can be attributed to the large difference in surface energy between the filler and matrix [28]. Conversely, very few agglomerates were found in the SR/DP-BT composites.…”

“…To negate this limitation, researchers focused on doping to modify BT [26,27]. Dopamine, which can interact strongly with metal oxides by forming hydrogen bonds [4], was considered an effective chemical with which to modify the surface of BT particles [26,28]. Moreover, both the aromatic group and the hydrogen bond are of high polarizability [29,30] which is propitious to the enhancement of the dielectric constant.…”

The fabrication of dielectric elastomers from silicone rubber and barium titanate: employing equi-biaxial pre-stretch to achieve large deformations

“…Thickness strain (s z ) under a high electric field can be approximated by the expression [14][15][16] 2 0…”

“…The electromechanical sensitivity (β), which is the ratio of dielectric constant to elastic modulus, was considered a significant value in determining voltage-induced deformation [16]. As can be seen from Fig.…”

Simultaneously improved actuated performance and mechanical strength of silicone elastomer by reduced graphene oxide encapsulated silicon dioxide

“…The main reasons are the poor dispersion of graphene in matrix, the restacking of graphene sheets during preparation caused by π-π stacking and hydrophobic interactions, and/or weak interfacial adhesion between graphene sheets and the polymer matrix [25][26][27]. A good dispersion of GO in the polymer matrix and a strong interfacial adhesion between GO and the matrix can be obtained via the organic functionalization of GO [28,29]. A disadvantage of this approach is that it is complicated and time-consuming.…”