This paper examines the effect of temperature on the structural stability and mechanical properties of 20-layered (10,10) single-walled carbon nanotubes (SWCNTs) under tensile loading using an $\mathrm{O}\left(N\right)$ tight-binding molecular-dynamics simulation method. We observed that (10,10) tube can sustain its structural stability for the strain values of 0.23 in elongation and 0.06 in compression at $300\mathrm{K}$. Bond-breaking strain value decreases with increasing temperature under stretching but not under compression. The elastic limit, Young’s modulus, tensile strength, and Poisson ratio are calculated as 0.10, $0.395\mathrm{TPa}$, $83.23\mathrm{GPa}$, and 0.285, respectively, at $300\mathrm{K}$. In the temperature range from $300\text{to}900\mathrm{K}$, Young’s modulus and the tensile strengths decrease with increasing temperature while the Poisson ratio increases. At higher temperatures, Young’s modulus starts to increase while the Poisson ratio and tensile strength decrease. In the temperature range from $1200\text{to}1800\mathrm{K}$, the SWCNT is already deformed and softened. Applying strain on these deformed and softened SWCNTs does not follow the same pattern as in the temperature range of $300\text{to}900\mathrm{K}$.

Cobalt ferrite (CoFe₂O₄) has numerous desirable features such as high anisotropy, good magnetic saturation, large coercivity and high mechanical strength. These remarkable characteristics provide extensive employment for their wide application from industrial to biomedical. The present study aims to evaluate the crystal properties, particle size, and morphology of CoFe₂O₄ nanoparticles prepared by the thermal treatment method and investigates their biocompatibility. XRD and FTIR analyses demonstrated that CoFe₂O₄ nanoparticles have an inverse cubic spinel crystalline structure. The average size of spherical CoFe₂O₄ nanoparticles was confirmed by SEM analysis as 58 nm. The cytotoxic effect of CoFe₂O₄ nanoparticles was evaluated in L929 cells by using the XTT cell viability assay. After 24 h treatment of CoFe₂O₄ nanoparticles with a concentration between 10 and 1000 µg/ml, the viability of L929 cells did not significantly decrease. It is concluded that growth CoFe₂O₄ nanoparticles are beneficial materials for use in various biomedical applications.

Copper ferrite/copper oxide (CuFe₂O₄/CuO) nanocomposites contents were prepared by using co-precipitation and sol-gel methods. The alternating current impedance and permittivity parameters of the samples were obtained by an impedance analyzer between 10 Hz and 40 MHz. The temperature dependences of magnetization were measured in zero-field-cooled (ZFC) and field-cooled (FC) modes and hysteresis curves at 300 K were investigated. In this context, it has been determined that the 25% CuO doped copper ferrite nanomaterial was showed the reduced dielectric loss and super-capacitive ability for ultra-capacitor application at high frequencies. Additionally, the samples prepared in this work were exhibited a superparamagnetic behavior.