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Your search keyword '"Jutakridsada, Pasakorn"' showing total 21 results
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21 results on '"Jutakridsada, Pasakorn"'

12. Preparation and mechanism analysis of morphology-controlled cellulose nanocrystals by H2SO4 hydrolysis of Eucalyptus pulp.

Author

Jutakridsada, Pasakorn, Theerakulpisut, Somnuk, Srivastava, Varsha, Sillanpää, Mika, and Kamwilaisak, Khanita

Subjects
CELLULOSE nanocrystals, HYDROLYSIS, THERMOGRAVIMETRY, EUCALYPTUS, PAPER products industry, SCANNING electron microscopy, CHEMICAL properties
Abstract

Cellulose from Eucalyptus pulp has been used as raw material for producing cellulose nanocrystals (CNCs). In this research work, H2SO4 hydrolysis was utilized in the production of CNCs. The effects of hydrolysis parameters, namely, H2SO4 concentration (30, 40, and 50 wt%), hydrolysis time (30, 60, and 90 min), and hydrolysis temperature (60, 70, and 80 °C), on the CNC structure were examined. The physical and chemical properties of Eucalyptus pulp and CNCs were characterized using different techniques such as X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), transmittance electron microscopy (TEM), and thermal gravimetric analysis (TGA). The results showed the optimal condition was at 50 wt% of H2SO4 concentration, 60 min hydrolysis time, and 60 °C hydrolysis temperature, which yielded 75.51% ± 1.51 % of crystallinity and 4.03 ± 0.10 nm of crystal size. Furthermore, it was also determined that an increase in H2SO4 concentration, time, or temperature led to a lower percentage of crystallinity and reduction in crystal size. CNCs were noted to be more thermally stable than the Eucalyptus pulp. Thus, this method could be an alternative way to create a new product in the paper industry. [ABSTRACT FROM AUTHOR]

Published
2022
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21. Ag-doped Cobweb-like structure of TiO2nanotubes for antibacterial activity against Methicillin-resistant Staphylococcus aureus(MRSA)

Author

Chokesawatanakit, Nuttaporn, Jutakridsada, Pasakorn, Boonlue, Sophon, Knijnenburg, Jesper T.N., Wright, Phillip C, Sillanpää, Mika, and Kamwilaisak, Khanita

Abstract

Hydrothermal reaction and photodeposition were used to transform TiO2nanoparticles to TiO2nanotubes (TNTs) loaded with Ag. The structure and morphology of TNTs and Ag/TNTs were characterized, and the antibacterial activity of all catalysts against Methicillin-resistant S. aureuswas tested using agar well diffusion and total viable plate count methods in the absence and presence of UV light. The cobweb-like structure of TNTs was noticed, and the network could increase the surface area to 184–216 m2/g, an up to fourfold increase compared to TiO2P25. The XRD, EDS, HRTEM and UV-DR results revealed Ag nanoparticle deposition on the TNTs surface. The HRTEM result also showed no change in the shape or morphology of TNTs. The Ag nanoparticle size on the TNTs surface ranged from 8.928 ± 1.487 to 14.654 ± 2.901 nm. The light absorption capacity of TiO2, TNTs, and Ag/TNTs displayed antibacterial activity in the presence of UV light. In contrast, only Ag/TNTs could reduce the bacteria growth in the dark condition, which decreased the restriction of TNTs and TiO2. The maximum antibacterial activity was obtained at 1.5%Ag/TNT, at which the cell viability was 77.86% of the initial number concentration. Based on the result of this research work, it could be confirmed that Ag/TNTs can potentially be used as a disinfection material in both presence as well as absence of UV light.

Published
2021
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