scholarly journals Importance of matrix inelastic deformations in the initial response of magnetic elastomers

Soft Matter ◽  
2018 ◽  
Vol 14 (11) ◽  
pp. 2170-2183 ◽  
Author(s):  
Pedro A. Sánchez ◽  
Thomas Gundermann ◽  
Alla Dobroserdova ◽  
Sofia S. Kantorovich ◽  
Stefan Odenbach
Keyword(s):  
External Field ◽  
Polymer Matrix ◽  
Initial Response ◽  
Field Application ◽  
Magnetic Response ◽  
Magnetic Elastomers

The initial magnetic response of magnetic elastomers can be explained by irreversible polymer matrix deformations under first external field application.

Relaxation Method Simulation of Confined Polymer Dispersed Liquid Crystals in an External Field

2000 ◽  
Vol 651 ◽  
Author(s):  
J. J. Castro ◽  
R. M. Valladares ◽  
A. Calles
Keyword(s):  
Liquid Crystals ◽  
External Field ◽  
Electric Field ◽  
Polymer Matrix ◽  
Relaxation Method ◽  
Droplet Surface ◽  
Relaxation Methods ◽  
Polymer Dispersed Liquid Crystals ◽  
Polymer Dispersed ◽  
Confined Polymer

AbstractPolymer dispersed liquid crystals (PDLC) are materials formed by nematic liquid crystals droplets with radii of a few hundred Å embedded in a polymer matrix. We discuss the use of relaxation methods for the study of the response of the director of a PDLC under the switching of an external electric field. We simulate the confining system by considering different boundary conditions at the droplet surface.

Theoretical study on the gigantic effect of external static electric field application on the nonlinear optical properties of 1,2,3,5-dithiadiazolyl π-radical dimers

2018 ◽  
Vol 2 (4) ◽  
pp. 785-790 ◽  
Author(s):  
Hiroshi Matsui ◽  
Masaki Yamane ◽  
Takayoshi Tonami ◽  
Takanori Nagami ◽  
Kenichiro Watanabe ◽  
...  
Keyword(s):  
Optical Properties ◽  
External Field ◽  
Electric Field ◽  
Nonlinear Optical ◽  
Theoretical Study ◽  
Field Application ◽  
Nonlinear Optical Properties ◽  
Static Electric Field ◽  
Highly Active

The promising potential of π-radical dithiadiazolyl dimers as a novel class of highly-active external-field-driven NLO switches.

scholarly journals On anisotropic mechanical properties of heterogeneous magnetic polymeric composites

2019 ◽  
Vol 377 (2143) ◽  
pp. 20180212 ◽  
Author(s):  
Dmitry Borin ◽  
Gennady Stepanov ◽  
Eike Dohmen
Keyword(s):  
Magnetic Field ◽  
Mechanical Properties ◽  
External Field ◽  
Axial Loading ◽  
Homogeneous Magnetic Field ◽  
Field Application ◽  
Direction Parallel ◽  
Shear Moduli ◽  
Planar Shear ◽  
Anisotropic Mechanical Properties

This study is devoted to the magneto-mechanical characterization of heterogeneous magnetoactive elastomers based on an elastic polydimethylsiloxane matrix with embedded spherical magnetic soft microparticles and magnetic hard microparticles of irregular shape. An issue of the anisotropic mechanical properties of these smart composites is considered. Non-magnetized and pre-magnetized specimens are characterized using a planar shear and axial loading in an externally applied homogeneous magnetic field. The field direction differs relative to the direction of the field used for the specimens pre-magnetization. Results of the different methods allow comparison of the tensile shear moduli for the samples with an initially identical composition. Obtained results demonstrate a strong correlation between the composite behaviour and orientation of the magnetic field used for the pre-magnetization of the sample relative to the external field applied to a sample during the test. Composites pre-magnetized in the direction parallel to an applied mechanical force and external magnetic field show higher magnetorheological response than composites pre-magnetized transversally to the force and the field. Application of the external field directed opposite to the direction of the pre-magnetization reduces the observed stiffening. Moreover, in this situation a softening of the material can be observed, depending on the magnitude of the external field and the field used for pre-magnetization. This article is part of the theme issue ‘Heterogeneous materials: metastable and non-ergodic internal structures’.

scholarly journals Magnetic response of NiFe2O4 nanoparticles in polymer matrix

2009 ◽  
Vol 321 (13) ◽  
pp. 2015-2020 ◽  
Author(s):  
A. Poddar ◽  
R.N. Bhowmik ◽  
Amitabha De ◽  
Pintu Sen
Keyword(s):  
Polymer Matrix ◽  
Magnetic Response ◽  
Nife2o4 Nanoparticles

scholarly journals Efficient Chain Formation of Magnetic Particles in Elastomers with Limited Space

Polymers ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 290
Author(s):  
Shota Akama ◽  
Yusuke Kobayashi ◽  
Mika Kawai ◽  
Tetsu Mitsumata
Keyword(s):  
Storage Modulus ◽  
Magnetic Particles ◽  
Volume Fraction ◽  
Magnetic Response ◽  
Chain Formation ◽  
Volume Fractions ◽  
Limited Space ◽  
Percolation Behavior ◽  
Magnetic Elastomers

The magnetic response of the storage modulus for bimodal magnetic elastomers containing magnetic particles with a diameter of 7.0 μm and plastic beads with a diameter of 200 μm were investigated by varying the volume fraction of plastic beads up to 0.60 while keeping the volume fraction of the magnetic particles at 0.10. The storage modulus at 0 mT for monomodal magnetic elastomers was 1.4 × 104 Pa, and it slightly increased with the volume fraction of plastic beads up to 0.6. The storage modulus at 500 mT for bimodal magnetic elastomers at volume fractions below 0.25 was constant, which was equal to that for the monomodal one (=7.9 × 104 Pa). At volume fractions of 0.25–0.40, the storage modulus significantly increased with the volume fraction, showing a percolation behavior. At volume fractions of 0.40-0.60, the storage modulus was constant at 2.0 × 105 Pa, independently of the volume fraction. These results indicate that the enhanced increase in the storage modulus was caused by the chain formation of the magnetic particles in vacancies made of plastic beads.

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