Search Results

Now showing 1 - 4 of 4

Some of the metrics are blocked by your
consent settings
Anti-corrosion performance of vinyl ester resin films with titanium dioxide and graphene hybrid reinforcement
(2022-12-01)
Khamme, Eakapoj
;
Sakulkalavek, Aparporn
;
Sakdanuphab, Rachsak
The present investigation addresses the development of vinyl ester resin (VER) by exfoliating titanium dioxide (TiO<inf>2</inf>) and graphene (G) in polymeric resin for anticorrosion applications on carbon steel (CS) substrates with different additive fillers (TiO<inf>2</inf> 3 wt%, G 2 wt%, and TiO<inf>2</inf> 3 wt% + G 2 wt%). The purpose of the study was to investigate structure, chemical bonding, adhesion, and corrosion. VER was prepared by triggering methyl ethyl ketone peroxide (MEKP) and an accelerator of cobalt naphthalate. The dip-coating method of VER composite films was fabricated on CS substrate with film thicknesses between 70 and 100 µm. The additive-polymer chemical bonding, morphologies and microstructure have been analysed by the techniques of Fourier transform infra-red spectroscopy (FTIR), scanning electron microscopy (SEM) and X-ray diffraction (XRD). Electrochemical impedance spectroscopy (EIS) and adhesion test were used to examine the anti-corrosion behaviour and performance. The blending of the additive fillers led to cobalt dispersion, crystallinity and corrosion resistance due to the development of interpenetrating polymer networks (IPNs) inside the VER films. TiO<inf>2</inf> and G hybrid reinforcements in VER enhance corrosion resistance and film adhesion.
Some of the metrics are blocked by your
consent settings
Graphene addition improved figure of merit in SnTe prepared by the rapid hybrid microwave solid-state method
(2022-02-01)
Gobpant, Jakrit
;
Somdock, Nuttakrit
;
Limsuwan, Pichet
;
Sakulkalavek, Aparporn
;
Sakdanuphab, Rachsak
We successfully synthesised SnTe-based powders (SnTe, Sn<inf>0.95</inf>Bi<inf>0.05</inf>Te, and SnTe with graphene addition) by a hybrid microwave solid-state method. This demonstrated comparable thermoelectric performance to the conventional heating method but had low energy consumption and rapid synthesis. Graphene addition to SnTe materials resulted in significant reduction of thermal conductivity. The SnTe with 5 wt% graphene exhibited a reduction in overall thermal conductivity from ∼10 W m−1 K−1 for SnTe to ∼2 W m−1 K−1 at 325 K and showed a moderate power factor. The Debye model was used to explain the origin of the effects of graphene on lattice thermal conductivity. The dimensionless figure of merit was increased by five times, from 0.07 for SnTe to 0.35 for SnTe with 5 wt% graphene. Our results demonstrated an effective method and additive material to synthesise and enhance the thermoelectric properties of SnTe materials.
Some of the metrics are blocked by your
consent settings
Figure of merit improvement of delafossite CuAlO2 with the addition of Fe and graphene
(2019-11-01)
Daichakomphu, Noppanut
;
Harnwunggmoung, Adul
;
Chanlek, Narong
;
Sakdanuphab, Rachsak
;
Sakulkalavek, Aparporn
This study investigated the synthesis of delafossite CuAlO<inf>2</inf> with Fe and graphene through a solid-state reaction method. The results of X-ray diffractometry showed that graphene was insoluble in delafossite CuAlO<inf>2</inf> while Fe was substituted into Al sites, expanding the d-spacing. From X-ray photoelectron spectroscopy, graphene induced excess oxygen in the delafossite CuAlO<inf>2</inf> structure via C–O–Cu bonds and improved the electrical conductivity. In addition, the thermal conductivity was reduced due to generation of point defects, phonon-phonon Umklapp and carrier-phonon scattering. The addition of Fe and graphene in CuAlO<inf>2</inf> shows an improvement of ZT to 0.0114 at 573 K. This is attributable to its increase in charge carrier density, as well as a decrease in thermal conductivity. This study highlights the benefits of combining Fe and graphene in delafossite CuAlO<inf>2</inf> as a prospective process for attaining a high figure of merit thermoelectric materials.
Some of the metrics are blocked by your
consent settings
Achieving thermoelectric improvement through the addition of a small amount of graphene to CuAlO2 synthesized by solid-state reaction
(2018-07-15)
Daichakomphu, Noppanut
;
Sakdanuphab, Rachsak
;
Harnwunggmoung, Adul
;
Pinitsoontorn, Supree
;
Sakulkalavek, Aparporn
In this work, delafossite CuAlO<inf>2</inf> powders with graphene (0.00–0.20 wt%) were synthesized by a solid-state reaction method. X-ray diffraction and transmission electron microscope results indicated that graphene was segregated in CuAlO<inf>2</inf> as a split phase, such as composite material. A little addition of graphene content reduces the thermal conductivity and increases the carrier concentration because the graphene generates many point defects and aided carrier-phonon scattering. The CuAlO<inf>2</inf> with graphene content of 0.05 wt% shows the maximum electrical conductivity of 470 S/m at 700 K. In addition, the maximum value for ZT of 0.0045 was recorded at 575 K with the graphene/CuAlO<inf>2</inf> composite (0.05 wt%). Therefore, in brief, this study has highlighted the benefits of combining delafossite CuAlO<inf>2</inf> with a small amount of graphene as a potential route for achieving highly efficient thermoelectric materials.

KMITL

Browse

Filters

Settings

Sort By

Results per page

Search Results