Sergei A. Kostrov's research while affiliated with Lomonosov Moscow State University and other places

... In recent years, there is growing interest in the investigation of magneticfield-induced macroscopic deformations of an intriguing class of polymer-based ferromagnetic composite materials, known as magnetorheological or magnetoactive elastomers (MAEs) [1][2][3][4][5][6][7][8][9][10][11][12][13]. In general, MAE comprise micro-or nanometer-sized ferromagnetic particles embedded into a soft elastomer matrix [14][15][16][17][18][19][20][21]. The reason for this surge of interest is determined by much higher deformations of MAEs (longitudinal strain up to 10 −2 -10 −1 ) in technically feasible magnetic fields (few hundred kA/m) in comparison to conventional (pure metals and alloys) magnetostrictive materials (strain up to about 2 × 10 −3 ) [22], which makes them promising for potential applications as magnetically controlled soft actuators in soft robotics [23,24] and magnetic field sensors [10]. ...

... In a recent work [67], we proposed a new platform for the design of magnetoactive materials whose properties can be programmed after curing. The developed magnetoactive composite was based on a thermoplastic matrix formed by bottlebrush graft copolymers (A-g-B) with PS and PIB side chains. ...

... Materials produced with this method are susceptible to oil leakage, which can occur during deformation or over time. Recently, we reported a different approach to the design of supersoft MAEs based on polymer networks with brush-like strands and demonstrated that they achieve the same level of magnetic response as highly diluted traditional linear MAEs but without the addition of a low-molecular-weight plasticizer [43]. The elimination of hazardous leakage components, while maintaining the softness and tissue mimetic properties of the matrix, expands the applications of these materials, particularly in medicine. ...

... Under the influence of an external magnetic field, these materials can change their physical properties due to magnetic interactions of magnetic particles (MPs) and magnetoelastic coupling. MAEs can deform [11][12][13][14][15][16] and change electric [17][18][19][20] and rheological [21][22][23][24][25][26][27][28][29] properties. An enormous magnetic response is used as the basis for many of the important practical applications of the MAEs, in particular, in soft robotics, vibration control and haptic feedback devices, active braking systems, pressure and magnetic field sensors, etc. [30][31][32][33][34][35][36][37][38]. ...

... These properties make MAEs very interesting for a variety of technical implementations. In particular, applications for prosthetic and ophthalmic medical devices [24][25][26], actuators and sensors [5,27,28], energy harvesting [29][30][31], micro-robots and -pumps [32,33] have been proposed. ...