Stability investigation of water based exfoliated graphene nanofluids
Until now stability is a crucial technical challenge to prepare a homogeneous dispersion. The main purpose of this work is to experimentally investigate the suspension stability of the exfoliated Graphene (Gr) suspension in deionized water (DW) (Gr/DW). Five different samples were prepared by var...
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| Main Authors: | , , , , |
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| Format: | Conference or Workshop Item |
| Language: | English English |
| Published: |
IOP Publishing Ltd
2019
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/72442/1/72442%20Stability%20investigation%20of%20water%20based.pdf http://irep.iium.edu.my/72442/2/72442%20Stability%20investigation%20of%20water%20based%20SCOPUS.pdf http://irep.iium.edu.my/72442/ https://iopscience.iop.org/article/10.1088/1757-899X/488/1/012002/pdf |
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| Summary: | Until now stability is a crucial technical challenge to prepare a homogeneous
dispersion. The main purpose of this work is to experimentally investigate the suspension
stability of the exfoliated Graphene (Gr) suspension in deionized water (DW) (Gr/DW). Five
different samples were prepared by varying the exfoliated Gr volume fraction from 0.11 to 0.30
% in deionized water. For the observation of sedimentation photo capturing was used as a
primary technique. Finally stability of the exfoliated Gr/DW nanofluids were monitored
quantitatively with the aid of optical absorbance measurements using ultra violet-visible
absorbance spectroscopy. The wavelength range of light was varied from 200 to 800 nm.
Digital photographs of Gr/DW nanofluid samples after preparation of about 25 days shown
homogeneous and visibly there was no sedimentation in the suspensions. The peak absorbance
of Gr/DW nanofluids was appeared at the wavelength of 280 nm. For a certain volume fraction,
absorbance was decreased monotonically with the increasing wavelength. The relative
concentration of the Gr/DW samples was decreased due to slight agglomeration by the
increasing concentration of precipitation with time. After 600 hours (~25 days), the lowest and
maximum precipitation rate were appeared ~ 6 and ~ 10 % for the Gr/DW samples with the
volume fraction of 0.11 and 0.30 % respectively. Different amount of exfoliated Gr loading
affect the rate of sedimentations of exfoliated Gr/DW nanofluids. |
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