Event Title

Deposition of Carbon Nanoparticles on natural porous particles by Electron-Beam Graphite Evaporation

Mentor 1

Marcia Silva

Location

Union Wisconsin Room

Start Date

29-4-2016 1:30 PM

End Date

29-4-2016 3:30 PM

Description

In this work we present the production of low sp3 amorphous carbon particulates on the surface of natural porous particles through graphite evaporation by electron beam from nanocrystalline graphite. The evaporation rate and final thickness as a function of the beam power during the procedure is measured. The dependence that the evaporation rate has on the beam power has a threshold character. The lowest power for evaporation is 390 W in our experiments with a maximum power of 740 W. The evaporation rate was 0.10-1.0 ú/s throughout the process and 1ú/s on the final soaking power output. The deposition rate is the same as the evaporation rate on substrates located 35.6 cm from the graphite target. The graphite, which was exposed to the electron beam, were pellets ranging from 3-6 mm in size. The chamber is pumped down from normal atmospheric pressure to roughly 5x10-6 torr and is vented with nitrogen when returning to atmospheric pressure after the deposition is complete. An analysis of the deposited carbon particulates was done by Fourier Transform Infrared (FTIR) spectroscopy and Raman spectroscopy. Surface area and pore volume/size analysis of the porous materials was performed via gas sorption using Nitrogen at 77k using an Autosorb IQ2 (Quantachrome Instruments). Analyses of the porous particles indicated that surface area of the porous material doubles (from 82 to 168 m2/g) and the pore diameter reduces one third (from 30ú to 10 ú) when compared to the parent particles. This is evidence that the adsorption properties of this material are significantly enhanced after deposition, permitting application in multiple fields, such as environmental and medical.

This document is currently not available here.

Share

COinS
 
Apr 29th, 1:30 PM Apr 29th, 3:30 PM

Deposition of Carbon Nanoparticles on natural porous particles by Electron-Beam Graphite Evaporation

Union Wisconsin Room

In this work we present the production of low sp3 amorphous carbon particulates on the surface of natural porous particles through graphite evaporation by electron beam from nanocrystalline graphite. The evaporation rate and final thickness as a function of the beam power during the procedure is measured. The dependence that the evaporation rate has on the beam power has a threshold character. The lowest power for evaporation is 390 W in our experiments with a maximum power of 740 W. The evaporation rate was 0.10-1.0 ú/s throughout the process and 1ú/s on the final soaking power output. The deposition rate is the same as the evaporation rate on substrates located 35.6 cm from the graphite target. The graphite, which was exposed to the electron beam, were pellets ranging from 3-6 mm in size. The chamber is pumped down from normal atmospheric pressure to roughly 5x10-6 torr and is vented with nitrogen when returning to atmospheric pressure after the deposition is complete. An analysis of the deposited carbon particulates was done by Fourier Transform Infrared (FTIR) spectroscopy and Raman spectroscopy. Surface area and pore volume/size analysis of the porous materials was performed via gas sorption using Nitrogen at 77k using an Autosorb IQ2 (Quantachrome Instruments). Analyses of the porous particles indicated that surface area of the porous material doubles (from 82 to 168 m2/g) and the pore diameter reduces one third (from 30ú to 10 ú) when compared to the parent particles. This is evidence that the adsorption properties of this material are significantly enhanced after deposition, permitting application in multiple fields, such as environmental and medical.