Optical Studies on Multiwalled Carbon Nanotubes via Modified &lt;i&gt;Wolff-Kishner&lt;/i&gt; Reduction Process

Tan, Kay Sin; Leo, Bey Fen; Ng, Meng Nee; Ahmad, Roslina; Johan, Mohd Rafie

doi:10.4028/www.scientific.net/amr.194-196.618

Cited by 4 publications

(1 citation statement)

References 22 publications

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“…It is known that the CNTs exhibit absorbance characteristics in the UV-Vis-NIR region 23 as a result of van Hove transitions, 24,25 which are very important for the effective light harvesting of solar irradiation. CNTs display optical absorptions due to resonant band-to-band transitions.…”

Section: Solar Irradiation Experimental Resultsmentioning

confidence: 99%

Ultrafast thermal charging of inorganic nano-phase change material composites for solar thermal energy storage

et al. 2015

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The present research article reports the heat transfer characteristics of nano-phase change material 10 (NPCM) composites: nanographite (NG)-PCM composites and multi-walled carbon nanotube (CNT)-PCM composites. For the preparation of NPCM composites, inorganic PCM, magnesium nitrate hexahydrate (Mg(NO 3 ) 2 .6H 2 O) was used as the pristine PCM and nanocellulose was used as a stabilizing agent. NG-PCM composites were prepared by varying the concentration of NG from 0.1-0.6 wt %, whereas CNT-PCM composites were prepared using 0.1 and 0.2 wt% of CNT. The prepared NPCM 15 composites exhibited enhanced thermal conductivity and a faster heating rate than pristine PCMs. Two different experimental setups were used for investigating the heat transfer characteristics of prepared NPCM composites during the melting and solidification processes: (i) conventional heating and (ii) solar illumination. The experimental observations indicated a higher heat transfer rate in NPCM composites as compared to pristine PCM for both experimental setups. It was observed that the heating melting and 20 solidification rate using conventional heating setup increased by 48% and 77%, respectively, for NG-PCM composites (at 0.6 wt %) & 24% and 15 %, respectively for CNT-PCM composites (at 0.2 wt %). Upon solar illumination, both NG-PCM and CNT-PCM composites demonstrated an ultrafast heating rate (of the order of few seconds) and a higher heating temperature than the conventional heating based approach. The ultrafast heating of NPCM composites upon solar illumination was attributed to the 25 plasmonic heating effect of carbon nanomaterials, which instantly convert optical energy into heat at nanometer scale in addition to conventional thermal diffusion based slow heating, the sole mechanism responsible for slow heating of PCM composites in conventional heating setup. Out of the two carbon nanofillers used, CNTs were shown to have better heat transfer performance than NGs to collect, convert and store the broad spectrum solar energy as thermal energy.

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Section: Solar Irradiation Experimental Resultsmentioning

confidence: 99%

Ultrafast thermal charging of inorganic nano-phase change material composites for solar thermal energy storage

et al. 2015

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Structural recovery mechanism after shear induced orientation of multiwalled carbon nanotube in polypropylene matrix

et al. 2017

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The effect of different multiwall carbon nanotubes concentration on morphology, optical, and electrical properties used as flexible anode

Khalid

Abdulsattar

Hussain

et al. 2020

J. Phys.: Conf. Ser.

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Spin coating technique has been used to deposit various concentration of Multi-wall carbon nanotube (MWCNTs) thin films on flexible substrate of polyethylene terephthalate (PET) as electrode, the study shows the effect of (1, 2, 3 mg/ml) concentration of (MWCNTs) thin films, by AFM, optical and electrical measurements which is indicate that the best concentration is2 mg/ml according to (2, 3D) images, which shown widespread and regular spread of CNTs, low absorption of wavelengths (400, 550, 700 nm) at low concentrations, and compatible increase of responsivity with increased current for PET-MWCNTs/MEH-PPV:MWCNTs/AL as photodetector device.

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Optical Studies on Multiwalled Carbon Nanotubes via Modified <i>Wolff-Kishner</i> Reduction Process

Cited by 4 publications

References 22 publications

Ultrafast thermal charging of inorganic nano-phase change material composites for solar thermal energy storage

Ultrafast thermal charging of inorganic nano-phase change material composites for solar thermal energy storage

Structural recovery mechanism after shear induced orientation of multiwalled carbon nanotube in polypropylene matrix

The effect of different multiwall carbon nanotubes concentration on morphology, optical, and electrical properties used as flexible anode

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