Polylactide/exfoliated graphite nanocomposites with enhanced thermal stability, mechanical modulus, and electrical conductivity

2010 ◽  
Vol 48 (8) ◽  
pp. 850-858 ◽  
Author(s):  
Il-Hwan Kim ◽  
Young Gyu Jeong
Keyword(s):  
Thermal Stability ◽  
Electrical Conductivity ◽  
Exfoliated Graphite ◽  
Graphite Nanocomposites ◽  
Mechanical Modulus

scholarly journals Enhanced electrical conductivity and mechanical properties in thermally stable fine-grained copper wire

2021 ◽  
Vol 2 (1) ◽  
Author(s):  
Qingzhong Mao ◽  
Yusheng Zhang ◽  
Yazhou Guo ◽  
Yonghao Zhao
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Electrical Conductivity ◽  
Yield Strength ◽  
High Speed ◽  
Copper Wire ◽  
Rapid Development ◽  
Dislocation Slip ◽  
Ultrafine Grains ◽  
The Wire

AbstractThe rapid development of high-speed rail requires copper contact wire that simultaneously possesses excellent electrical conductivity, thermal stability and mechanical properties. Unfortunately, these are generally mutually exclusive properties. Here, we demonstrate directional optimization of microstructure and overcome the strength-conductivity tradeoff in copper wire. We use rotary swaging to prepare copper wire with a fiber texture and long ultrafine grains aligned along the wire axis. The wire exhibits a high electrical conductivity of 97% of the international annealed copper standard (IACS), a yield strength of over 450 MPa, high impact and wear resistances, and thermal stability of up to 573 K for 1 h. Subsequent annealing enhances the conductivity to 103 % of IACS while maintaining a yield strength above 380 MPa. The long grains provide a channel for free electrons, while the low-angle grain boundaries between ultrafine grains block dislocation slip and crack propagation, and lower the ability for boundary migration.

Electro-conductively deposited carbon fibers for power controllable heating elements

RSC Advances ◽  
2015 ◽  
Vol 5 (34) ◽  
pp. 26998-27002 ◽  
Author(s):  
Chang Hyo Kim ◽  
Moo Sung Kim ◽  
Yoong Ahm Kim ◽  
Kap Seung Yang ◽  
Seung Jo Baek ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Electrical Conductivity ◽  
Carbon Fibers ◽  
Industrial Applications ◽  
Excellent Thermal Stability

Carbon fibers are considered as one of the promising heating elements in various industrial applications because of their excellent thermal stability and electrical conductivity.

Fabrication of Polyaniline–La2O3 Composite Nanofibers Showing Effective Control of Morphology, Electrical Conductivity, and Thermal Stability

2018 ◽  
Vol 29 (3) ◽  
pp. 1019-1028 ◽  
Author(s):  
Mohammad Mizanur Rahman Khan ◽  
Nurfarahhana Binti Daud ◽  
Mohammad Shahadat Hussain Chowdhury ◽  
Wan Ahmad Kamil Mahmood ◽  
Hisatoshi Kobayashi
Keyword(s):  
Thermal Stability ◽  
Electrical Conductivity ◽  
Composite Nanofibers ◽  
Effective Control

Bacterial cellulose as a carbon nano-fiber precursor: Enhancement of thermal stability and electrical conductivity

BioResources ◽  
2020 ◽  
Vol 15 (2) ◽  
pp. 3408-3426
Author(s):  
Fateme Rezaei ◽  
Rabi Behrooz ◽  
Shahram Arbab ◽  
Ehsanollah Nosratian Sabet
Keyword(s):  
Thermal Stability ◽  
Electrical Conductivity ◽  
Flame Retardant ◽  
Bacterial Cellulose ◽  
Heating Rate ◽  
Carbon Nanofiber ◽  
Diammonium Phosphate ◽  
Electrical Characteristics ◽  
Stabilization Process ◽  
Nanofiber Sheets

Bacterial cellulose was selected as a potential precursor for the production of carbon nanofiber because of its high purity and crystallinity. Diammonium phosphate ((NH4)2HPO4) as a flame retardant was used to impregnate the cellulosic nanofiber sheet precursor in order to increase its thermal stability during the thermal processing. Also, the effect of heating rate on the stabilization and carbonization processes of cellulosic nanofiber samples was investigated. The precursor and resulted carbon nanofiber sheets were characterized by scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), x-ray diffraction (XRD), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and electrical characteristics. The results showed that the simultaneous usage of flame retardant (diammonium phosphate) and low heating rate in the stabilization process (2 °C min-1) increases thermal stability of cellulosic nanofiber sheets and the carbon yield. The presence of a flame retardant acts like a low heating rate effect but does not significantly affect the high heating rate of the stabilization process. As carbonization temperature increased, electrical conductivity and crystallite size were increased for impregnated samples. The carbonization process at 1200 °C, with a heating rate of 2 °C min-1, makes bacterial cellulose precursor an appropriate candidate for producing carbon nanofiber sheets with proper electrical characteristics.

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