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Effective detection of ZnO in nicotine using butterfly wing scales
(2022-01-01)
Changcharoen, Thanachai
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Apiphatnaphakul, Thidsanu
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Watjanavarreerat, Wasupon
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Locharoenrat, Kitsakorn
This study aimed to elucidate the optical functions of naturally butterfly wing scales via precise control of morphology as an effective photonic sensor and confirm the content of metal oxide nanoparticles in surrounding nicotine. Metal oxide nanoparticles mixed with nicotine were deposited on the wing scales through the spin-coating method and hence investigated using optical microscopy and spectroscopy. Experimental results demonstrated that absorption intensities of ZnO and TiO<inf>2</inf> mixed with nicotine on Danaus genutia were remarkably enhanced. Due to the relatively high concentration of zinc found in e-cigarette aerosol, the intensity of ZnO/nicotine modelled as aerosol adsorption on Danaus genutia, further held a certain linear relationship with the concentration of ZnO. The limit of detection of ZnO was as low as 1 nM. The working mechanism of our sensor was explained through the molecular adsorption after H-bond formation of ZnO/nicotine molecules as high-index materials on the wing scales of Danaus genutia without aggregation. This photonic sensor is an alternative to the present-day methods for the rapid test of ZnO content, which is very simple without complicated instrumentation. Furthermore, our method might become a starting point for the advancement of portable instruments for onsite ZnO detection.
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Syngas production from sugarcane leftover gasification integrated with absorption process for green liquid production
(2019-10-20)
Chatrattanawet, Narissara
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Authayanun, Suthida
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Saebea, Dang
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Patcharavorachot, Yaneeporn
The aim of research is to present favorable operating conditions for the clean syngas production from sugarcane leftover through the gasification process by using AspenPlus™ software. In order to obtain the suitable syngas for liquid fuel production, this process should be integrated with gas cleaning. The simulation was performed by comparing three gasifying agents, i.e., steam, air, and steam-air. To find favorable operating conditions that provide the highest syngas molar flow rate, the effect of operating conditions in gasifier was also examined. In addition, the possibility of syngas production operated under a thermal self-sufficient condition was studied. The gasification results showed that the syngas production significantly increases with the increase of temperature. The proper gasifying temperature for three processes is at 750 °C. When the maximum syngas molar flow rate was considered, it was found that the use of steam (at S/B of 0.6) and steam-air (at S/B of 0.8 and A/B of 0.04) in gasification can achieve this criterion. Both processes can provide syngas molar flow rate as ∼149 kmol/h. However, it was found that thermal self-sufficient operation is possible when air and steam-air are used as gasifying agent. The result indicated that syngas molar flow rate obtained from air gasification (at A/B of 1.309) is more than that from steam-air gasification (at S/B of 0.1 and A/B of 1.375). In order to obtain the cleaner production of syngas, the absorption process with capturing CO<inf>2</inf> and H<inf>2</inf>S was studied via using monoethanolamine (MEA) as solvent. The optimal column pressure is 40 bars and the number of trays equals to 10. To obtain the H<inf>2</inf>S content below 0.1 mg/m<sup>3</sup>, the MEA molar flow rates are 325, 450, and 465 kmol/h for steam, air, and steam-air gasification processes, respectively.
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Effect on C-V characteristics of P-N photodetector
(2017-02-01)
Chaiyasoonthorn, Sawatsakorn
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Srithanachai, Itsara
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Sangwaranatee, Narong
This paper is aimed at investigating the way to reduce the Pt-doped effect on silicon N-Type photodetector. The influencing of Pt-doped on silicon mechanism is an important problem because the performance of semiconductor device may decrease as a result from this process. In this paper, the obtained experimental result has shown that the Roentgen radiation can be used to reduce the influence from Pt-doped process, where C-V characteristics are the parameters to study in this experiment, from which the Roentgen radiation characteristics may change because the silicon bulk absorbs radiation of about 60%. The results have indicated that the C-V characteristics are not significantly changed. This way, radiation may induce and reduce some of the defects in silicon bulk but C-V is without change. Accordingly, parameters should be investigated to explain the defects to confirm the influence of Roentgen radiation by I-V characteristics and carrier concentration.
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Copper nanowires on NaCl (110) template
(2013-04-29)
Locharoenrat, Kitsakorn
We studied optical properties of copper nanowires fabricated by a shadow deposition method. We found that the optical absorption spectra of thinner nanowires exhibited stronger anisotropic absorption than thickner nanowires. Absorption maxima are located at lower photon energy when incident field is parallel to the wire axes than they are perpendicular to each other. They also shift to lower energy when the widths of nanowires are increased. © (2013) Trans Tech Publications, Switzerland.

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