Vishal S. Makadia; Lalit M. Manocha; Satish Manocha; Hasmukh L. Gajera
Volume 8, Issue 3 , March 2017, , Pages 262-264
Abstract
A freeze-thaw technique is put forth as a novel approach to exfoliating graphene oxide sheets (GO-sheets) in aqueous media. This method does not use shear force or high-temperature treatment at any stage. Avoiding these factors prevents scrolling and promotes defect-free synthesis of the graphitic ...
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A freeze-thaw technique is put forth as a novel approach to exfoliating graphene oxide sheets (GO-sheets) in aqueous media. This method does not use shear force or high-temperature treatment at any stage. Avoiding these factors prevents scrolling and promotes defect-free synthesis of the graphitic planes. The research shows how the freeze-thaw technique successfully exfoliates graphitic planes without producing scrolls or defective graphene oxide planes. Further, when compared to conventional exfoliation methods, it was found that the freeze-thaw technique increased the surface area significantly.
T. S. K. Raunija; R. K. Gautam; S.C. Sharma; A. Verma
Volume 8, Issue 2 , February 2017, , Pages 136-144
Abstract
The main objective of the work was to rapidly prepare high density short carbon fiber reinforced randomly oriented C/C composite by coupling the processes. The C/C composite was fabricated by coupling two processes. In primary high pressure HP method, medium density C/C composite was prepared by mixing ...
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The main objective of the work was to rapidly prepare high density short carbon fiber reinforced randomly oriented C/C composite by coupling the processes. The C/C composite was fabricated by coupling two processes. In primary high pressure HP method, medium density C/C composite was prepared by mixing the exfoliated carbon fibers and PMP with distilled water; moulding of the slurry; drying of the green cake; hot-pressing of the preform and finally carbonizing the compact. In secondary low pressure ITC method, the medium density C/C composite was densified by SMP in three repeated cycles to obtain high density. The composite was characterized for microstructure, density, porosity, hardness, flexural strength, compressive strength and permeability. The results showed that the coupling of primary method with secondary method resulted in fine microstructure, high density (1.70 g/cm 3 ), excellent mechanical properties (flexural strength 77 MPa and compressive strength 161 MPa) and reduced porosity & permeability.
