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conferenceseries
.com
Joint Conference
July 17-18, 2017 Chicago, USA
International Conference on
DIAMOND AND CARBON MATERIALS & GRAPHENE AND SEMICONDUCTORS
Volume 6, Issue 6 (Suppl)
J Material Sci Eng, an open access journal
ISSN: 2169-0022
Diamond and Carbon 2017 & Graphene 2017
July 17-18, 2017
J Material Sci Eng 2017, 6:6(Suppl)
DOI: 10.4172/2169-0022-C1-077
Ferrites/reduced graphene oxide (RGO) in supercapacitors: MnZnFe
2
O
4
/RGO- based supercapacitors
with superior performance and high stability
Ibrahim Ismail
and
Fatma Moustafa
Zewail City for Science and Technology, Egypt
O
wing to the rapidly increasing demand for energy conversion devices, energy storage platforms have become significantly
attractive more than any instance in the past. Indeed, supercapacitors are considered one of the most promising
energy storage devices, due to their excellent reversibility, rapid charge/discharge, high power density, in addition to long-
life and cyclic stability compared to the analogous electrochemical energy storage devices. Typically, supercapacitors can be
classified into two basic categories, pseudo capacitors, and electrochemical double layer capacitors (EDLC). On the other
hand, graphene-based materials are given much consideration as effective electrode materials owing to their high specific
surface area, excellent chemical stability, electrical and mechanical properties, and the feasibility for large-scale production of
chemically-modified graphene (CMGs). To this end, the Hummers’ method is widely used to produce graphene oxides (GO).
Herein, the electrochemical performance of the MnZnFe
2
O
4
/RGO colloidal nano needle-based supercapacitors is investigated.
Cyclic voltammetry, galvanostatic charge–discharge and cycle stability have been investigated. The obtained results reveal that,
the MnZnFe
2
O
4
/RGO colloidal nanorods have a superior specific capacitance higher than MnZnFe
2
O
4
. The MnZnFe
2
O
4
/RGO
based- supercapacitors using H
2
SO
4
electrolyte demonstrated the best cycle stability among all the supercapacitors.
imohamed@zewailcity.edu.egBehavior of elastic modulus of nano filled epoxy resin under dynamic mechanical and nano
hardness analysis
Vijay K Srivastava
Indian Institute of Technology-BHU, India
A
carbon nanomaterial such asmulti-walled carbon nanotubes (MWCNTs) and graphene nano platelets (GnPs) has attracted
considerable interest over recent years due to its intrinsic mechanical, thermal and electrical properties. Incorporation
of small quantity of nano fillers into polymer can create novel nano composites with improved structural and functional
properties. The properties of polymers, as reflected by their response to externally applied stresses, are dependent on both time
and temperature. The dynamic mechanical analysis (DMA) of polymer-based MWCNT/epoxy resin and GnP/epoxy resin
nano composites provides important insight into the intimate conformation of the polymer chains in the sample, as well as
the interactions of these chains with MWCNT and GnP components in the composite system. Therefore, dynamic mechanical
and nano hardness measurements of MWCNT/epoxy resin and GnP/epoxy resin nano composite were used to evaluate the
effect of temperature on dynamic elastic modulus. These provide direct information on various other characteristic structural
parameters, such as dynamic viscoelastic behavior, glass transition temperature (Tg), storage and loss moduli, and tan δ. The
results of these measurements for all samples were compared, and allowed the evaluation of the effect of a magnetic field on
the MWCNT/epoxy resin and GnP/epoxy resin nano composites. It can be seen that the storage modulus decreased with the
increase of temperature, whereas loss modulus increased with increase of temperature. At low temperatures, all the samples
show a very high value of the storage elastic modulus, followed by gradual drops due to second order transactions between
40
o
C to 110
o
C. The principal drop, due to the glass transaction, is evident for all samples in the range 130
o
C to 140
o
C. But,
tanδ curves show a peak value 150
o
C to 160
o
C of temperature range indication glass transaction temperature. This indicates
that the addition of nano filler improves the elastic properties of the epoxy system at elevated temperatures in the rubbery
region. The loss modulus indicates that the energy has been converted into heat and can thus be used as a measurement
of viscous component or unrecoverable oscillation energy dissipated per cycle. It may be further concluded that the nano
hardness increases with increase of elastic modulus, as shown in figure.
vijayks210@gmail.com