High-voltage aqueous symmetric supercapacitor based on 3D bicontinuous, highly-wrinkled, N-doped porous graphene-like ultrathin carbon sheets

In this study, a facile pyrolysis is utilized to convert mantis shrimp shell into 3D bicontinuous porous, highly wrinkled, nitrogen doped, graphene-like ultrathin carbon sheet (3D BWGC). 3D BWGC achieves...

CONCRETE SLAB REINFORCED WITH GFRP AND EXTERNALY STRENGTH WITH CARBON SHEET UNDER IMPACT LOAD

When FRP bars used in concrete structures that exposed to harsh environments, their service life extended and the cost of their life cycle reduced. Recently, methods of externally bonding Carbon Fiber Reinforced Polymer (CFRP) sheets to RC slabs proposed to improve the dynamic behavior of RC slabs under impact load. In this study, the effect of the number of CFRP sheet layers (one or two) and the arrangement of CFRP sheets (covering the whole or parts of the surface) on the dynamic behavior of slabs reinforced with GFRP bar investigated. Nine specimens of (1550×1550×150) mm reinforced by GFRP bars were tested. A single control specimen was unstrings and eight specimens were strength with CFRP sheet on the tension face. A rigid steel projectile used to apply two dropping-weights of 150 kg as an impact load. The height of the drop was 5 meters. To determine punching shear capacity and critical velocity of perforation, different codes used and compared with the experimental results. The results of the experiments revealed that slab shear properties have a significant impact on their general behavior. Strength slab with carbon sheet enhances the behavior of RC slabs under impact loads and increases shear punching capacity.

Aluminum-Air Battery with Buckypaper Air Cathode

Thin films made of carbon nanotubes are called buckypaper (BP), which is expected to be applied to electronic devices. Usually, BP is made by the chemical vapor deposition method. In this study, we used the vacuum filtration method to make low-cost BP. To justify the outstanding electronic performance of the fabricated BP, it was utilized to make the air-cathode of the aluminum-air battery. Since the BP is lighter and has a larger specific surface area than the carbon sheet, the aluminum-air battery can be miniaturized while increasing its performance. Furthermore, UV-ozone treatment was also applied to further improve the performance of the BP because it is able to clean and improve the surface conditions.

Modification of Hardness Properties Characterizing Carbon Steel American Society for Testing and Materials in Carbon Steel A36 Using Bagasse Ash from the Waste of Sugarcane Industries

In this work, the effect of bagasse ash from waste sugarcane industries on American society for testing and materials in carbon steel A36 (ASTM A36) was investigated. The ash caused the formation on the surface of the samples’ carbon sheet, thereby improving the hardness of the materials’ property. The samples were polished and cleaned in preparation for hardness tests (Rockwell) and microstructural investigation. Furthermore, the bagasse was sintered in a furnace at 400 °C for 3 h to bagasse ash. Additionally, the ash was sifted to a sample size of 100 μm and mixed with 100:0, 90:10, and 80:20 ratios of barium carbonate (BaCO3). The samples were calcined in a pack carburizing box between bagasse ash and BaCO3 at 950 °C for 8 h. The carburized samples were used to classify by Thermogravimetric Analysis (TGA), Energy Dispersive X-ray Spectroscopy (EDS), Optical Emission Spectroscopy (OMS), and Optical Microscopy (OM), respectively. The results revealed that 88% of carbon by weight of bagasse ash contributes to significant improvement in the mechanical properties of the ASTM A36 steel.