Silicone–barium titanate composites with increased electromechanical sensitivity. The effects of the filler morphology

Abstract

Dielectric elastomers were prepared on the basis of high molecular weight polydimethylsiloxane-α,ω-diol filled with barium titanate particles having well-defined size and morphology.

Dielectric elastomers based on silicones filled with transitional metal complexes

“…was prepared and purified in house by a procedure adapted from the literature [22] and described in ref. [23]. Stress-strain measurements were performed on a TIRA test 2161 apparatus, Maschinenbau…”

Dye sensitized solar cell applications of CdTiO3–TiO2 composite thin films deposited from single molecular complex

“…Such superior combination of functional properties ranked them as "intelligent materials" for the development of sensors [7,8], microelectronic devices [9,10] and photocatlytic cells [11]. Cadmium titanate (CdTiO 3 ), a member of this well-known family, owns a wide range of the above-mentioned properties and has been extensively described in literature in crystal, thin film and powder formats.…”

Silicone dielectric elastomers based on radical crosslinked high molecular weight polydimethylsiloxane co-filled with silica and barium titanate

“…Continuing our efforts to obtain silicone elastomers with optimized electromechanical properties [11,[25][26][27][28], in this paper, we addressed the working strategy consisting in the original combination of two active fillers with complementary effects: silica, as a reinforcing filler and barium titanate, both from commercial sources, to increase the dielectric permittivity of the composites obtained. In addition, the uniqueness of our approach consists in the use of a matrix of a polydimethylsiloxane of high molecular weight (M w = 642000 g mol -1 ) and its curing by a radical mechanism, which takes place at high temperature and pressure.…”

“…In addition, the uniqueness of our approach consists in the use of a matrix of a polydimethylsiloxane of high molecular weight (M w = 642000 g mol -1 ) and its curing by a radical mechanism, which takes place at high temperature and pressure. The crosslinking pattern is different from that used in the majority of cases reported in the literature to stabilize the dielectric silicone elastomers for which, in general, commercial silicone kits with vulcanization by condensation of the chain ends with a tri-or tetrafunctional crosslinking agent are used [5,25,29,30]. The system reported here rather resembles the curing by hydrosilylation, but it is applicable only in case of relatively low molecular weight polysiloxanes, with more flexibility to ensure access to each other functional groups (Si-H and Si-CH=CH 2 ) [27,31,32].…”