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Synthesis of ZnO nanoparticles by Ball-milling process for biological applications
(2021-01-01)
Wirunchit, S.
;
Gansa, P.
;
Koetniyom, W.
This research is focus on synthesis of ZnO nanoparticles (ZnO-NPs) for biological application by Ball-milling process. This research presents the synthesis of ZnO nanoparticles with the difference calcined temperatures ranging from 400 to 900 °C effect on size and morphology. The synthesis ZnO nanoparticles were characterized by employing technique including X-ray diffraction technique (XRD), Fourier Transform Infrared spectroscopy (FT-IR) and Raman spectroscopy. The morphology and size of ZnO nanoparticles determined by Field Emission Scanning Electron Microscope (FE-SEM) and finally studied the effect of antibacterial activity of ZnO NPs. It was found that the temperature at which high purity ZnO is = 800 °C. Especially, at 800 °C, the smallest particle size of ZnO nanoparticles was obtained. The morphology of ZnO nanoparticles from Ball-milling process is spherical. Bacteriological properties of ZnO nanoparticles were found that the synthesis by using the Ball-milling process was high effective to inhibit bacteria.
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Study of nano Titanium (IV) oxide for Self-cleaning applications
(2021-01-01)
Koetniyom, W.
;
Bandansong, T.
;
Rangkasikorn, A.
;
Wirunchit, S.
This research is study the fabrication of a composite film between Polydimethylsiloxane (PDMS) and Titanium (IV) oxide nanoparticles for self-cleaning applications via the spin coating process. This study has focused on the optimum ratio between PDMS and Titanium (IV) oxide and the optimum speed for the spin coating process, especially in order to obtain a composite film with outstanding self-cleaning surface properties. After that, the prepared composite films were studied by UV-Vis spectrometer, water contact angle measurement and solar simulator. Self-cleaning properties was investigated from the testing of wetting properties and measuring the water contact angle. Furthermore, the organic degradation properties were examined by degradation of methylene blue under UV light via solar. From this research was found that the PDMS/Titanium oxide (IV) at 4:3 ratio is the most optimum condition for the fabrication of a composite film by observing with the degradation of methylene blue has showed the highest the degradable efficiency is 55.59%.
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The study of UV protection materials
(2018-09-05)
Wirunchit, S.
;
Apivitcholchat, C.
;
Chodjarusawad, T.
;
Koetniyom, W.
Most people are aware of how harmful UV radiation is to the skin. The sun's ultraviolet rays, UVA and UVB, are known to cause skin damage, from freckling and moles to fatal skin cancer. That's why it is important to apply sunscreen products to your skin, to help you stay sun safe and absorber harmful ultraviolet rays. This research is studied to focus on how to make UV materials to protect UV radiation. The UV absorber additive materials are 4 types; nanoZnO solid powder at size 25-50 nm (ZnO-1), nanoZnO 40%wt in ethanol solution (ZnO-2), nano TiO<inf>2</inf> solid powder at size 17-50 nm (TiO<inf>2</inf>-1) and nano TiO<inf>2</inf> solid powder 325 mesh (TiO<inf>2</inf>-2) respectively, that was mixed in pure baby lotion cream. Three concentration of UV absorber additive materials are 5, 10 and 15 % by weight were compared with pure baby lotion cream. All compositions were tested UV absorbance with UV spectroscopy together with studied micro structure of UV absorber additive materials by Field emission scanning electron microscope (FE-SEM). The techniques to confirm UV absorber materials are X-ray diffraction (XRD), Raman and Fourier transform infrared (FT-IR) spectroscopy. From these results were shown the uncertainty of each concentration of UV absorber materials because of the most of the films were not uniform dispersion and depended on the coating technique. This study evaluated the performance of ultraviolet transmission on of different materials by using a single energy light emitting diode as light source. Titanium dioxide (TiO<inf>2</inf>) and zinc oxide (ZnO) are two of most popular inorganic ultraviolet protective materials in UV protection skin care products was studied.
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AFM force distance curve measurement for surface investigation of polymers compound blend with metal nanoparticles
(2017-01-01)
Koetniyom, W.
;
Suhatcho, T.
;
Treetong, A.
;
Thiwawong, T.
The atomic force microscopy (AFM) has been used to perform surface force measurements in contact mode to investigate surface properties of model systems in the nanoscale. Two different polymers compound are observed include Polydimethylsiloxane (PDMS) and Polyvinylidene fluoride (PVDF). Both polymers compound are blended with metal nanoparticles consist of gold and silver by compare with the pristine polymer. The results from adhesion force and surface roughness tests are inversed. The adhesion force is increased with the NPs concentration whereas the surface roughness is decreased. Hydrophobic and hydrophilic properties of the polymer have been studied by employing contact angle. However, variation of contact angle of polymer nanocomposites is confirmed the hydrophobicity of PDMS while PVDF is certainly different around 70-77° of Ag NPs and 70-81° of Au NPs.
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Effect of trichlorobenzene additive on the performance and morphology of polyfluorene and fullerene derivative bulk heterojunction solar cells
(2012-08-01)
Koetniyom, W.
;
Keawprajak, A.
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Piyakulawat, P.
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Jiramitmongkon, K.
;
Nukeaw, J.
The influence of additive, namely 1,3,5-trichlorobenzene (TCB), on the morphology and performance of bulk heterojunction (BHJ) organic solar cells was studied based on a 1:2 (w/w) blend of benzothiadiazole/thiophene-based copolymers (PFTBzTT) to [6,6]-phenyl-C <inf>61</inf> butyric acid methyl ester (PCBM). The active layers were deposited by spin-coating from solutions using chloroform, with different additive concentrations from 0 to 36mg/ml. The addition of solvent additive into the polymer solution was able to improve the performance of BHJ solar cells. The maximum power conversion efficiency (%PCE) of 0.85% was obtained for a cell with the TCB concentration of 12mg/ml after annealing at 180°C for 20min. From atomic force microscopy (AFM) images, the films processed without TCB appear smoother than those with the TCB additive. A large extent of segregation was also observed in the films processed with a high TCB concentration. The optical images of the thin films suggest that the optimum concentrations of the additive cause the polymer self-organisation, resulting in some aggregation of large PCBM crystals. © 2011 Canadian Society for Chemical Engineering.

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