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Viscoelastic properties of silicone rubber with admixture of SiO<sub>2</sub> nanoparticles
Kulik, V.M.,Boiko, A.V.,Bardakhanov, S.P.,Park, H.,Chun, H.H.,Lee, I. Elsevier 2011 Materials science & engineering. properties, micro Vol.528 No.18
<P><B>Highlights</B></P><P>► SiO<SUB>2</SUB> nanoparticles were used as an additive to silicone rubber. ► Dynamic viscoelastic properties of the silicone rubber changed significantly. ► The modulus of elasticity is increased, while the loss factor is decreased. ► The new method of measurements enabled determination of the dynamic Poisson's ratio.</P> <P><B>Abstract</B></P><P>Measurements have been carried out to investigate the change of dynamic viscoelastic properties of silicone rubber with the admixture of small amount SiO<SUB>2</SUB> nanoparticles. A novel measurement method for the dynamic viscoelastic properties including the modulus of elasticity, the loss factor and the Poisson's ratio is employed. It was found that an admixture of rather small amount of SiO2 nanoparticles can substantially affect the viscoelastic properties of the silicone rubber. It is observed that the modulus of elasticity is increased, while the loss factor and the Poisson's ratio are reduced.</P>
Magnetically Soft Nanomaterials Obtained by Devitrification of Metallic Glasses
Tadeusz Kulik,Jarosław Ferenc,Maciej Kowalczyk,Liang Xiubing,Natalya Nedelko,Anna Ślawska-Waniewska 한국자기학회 2004 Journal of Magnetics Vol.9 No.2
Magnetically soft nanomaterials obtained by controlled crystallisation of metallic glasses are the newest group of materials for inductive components. In particular, research is carried out in the field of alloys for high temperature applications. This kind of materials must meet two basic requirements: good magnetic properties and stability of properties and structure. In the present work the magnetic properties and structure of Fe-Co-Hf-Zr-Cu-B (HITPERM-type) alloys were investigated, as well as their stability. Differential thermal analysis, (DTA), X-ray diffractometry (XRD), transmission electron microscopy (TEM), magnetometry (VSM) and quasistatic hysteresis loop recording were used to characterise structure and properties of the alloys investigated. Optimisation against properties and their stability was performed, resulting in formulation of chemical composition of the optimum alloy, as well as its heat treatment.