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By: Meysam Tabandeh - Khorshid J. B. Ferguson B.F. Schultz Pradeep K. Rohatgi

Exfoliating graphene nanoplatelets and preparing alumina/exfoliated graphene composite powders by mechanical milling. By: Meysam Tabandeh - Khorshid J. B. Ferguson B.F. Schultz Pradeep K. Rohatgi. Experimental Procedure.

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By: Meysam Tabandeh - Khorshid J. B. Ferguson B.F. Schultz Pradeep K. Rohatgi

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  1. Exfoliating graphene nanoplatelets and preparing alumina/exfoliated graphene composite powders by mechanical milling By: MeysamTabandeh-Khorshid J. B. Ferguson B.F. Schultz Pradeep K. Rohatgi

  2. Experimental Procedure • Graphene nanoplatelets with an average thickness of 6nm and diameter of 5 µm, alumina powders with average particle size of 47 nm, block copolymer Disperbyk-2150 (BYK Chemie GmbH) and ethyl alcohol were used as initial materials. • The block copolymer Disperbyk-2150 (BYK Chemie GmbH) was dissolved in ethanol in a beaker. Then, graphene nano platelets were added to the beaker. The weight ratio of graphene to block copolymer in ethanol was 1:1. This solution was dispersed for 15min by ultrasonic vibration. Then, the dispersion continued by using a magnetic stirrer for 30 min. • In the next step, the solution was poured into an attritor mill and the alumina nanoparticles with the weight ratio of 95:5 to the graphene were added to the attritor mill. The milling was conducted for 8 hours. At two hours intervals a small portion of the solution was collected for characterization. • To investigate the effect of the block copolymer on exfoliating graphene, the same process was conducted without using the block copolymer. • To investigate the effect of processing on exfoliating graphene, Raman Spectroscopy was conducted on the samples. In addition FESEM was used to investigate the dispersion and exfoliation of graphene into the alumina nanoparticles.

  3. Results Raman Spectroscopy results for the As Received Graphene nanoplatelets. Raman Spectroscopy results after using the copolymer and 2 hours mechanical milling of Graphene nanoplatelets and alumina nanoparticles. Raman Spectroscopy results after using the copolymer on Graphene nanoplatelets.

  4. Results Using the block copolymer shifted the position of the G band peak from 1570 cm-1 to approximately 1579 cm-1 . SEM micrograph of alumina nanoparticles and graphene nanoplatelets after mechanical milling After 2 hours of milling the G band peak for the graphene nanoplatelets was shifted from 1570 cm-1 to around 1575 cm-1 after mechanical milling. • The results show that these two processes exfoliate the graphene nanoplatelets and decrease the number of graphene layers. • Processing in the attritor mill for 2, 4, 6, and 8 hours resulted in no further significant change in the position of G band peak.

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