Suan Sunandha Science and Technology Journal https://li02.tci-thaijo.org/index.php/ssstj <p>The Suan Sunandha Science and Technology Journal (SSSTJ) is a double-blind peer-reviewed scientific journal published twice a year (January and July) by the Faculty of Science and Technology, Suan Sunandha Rajabhat University. Submissions of manuscripts should be sent to the Editor of the SSSTJ by online system.The manuscript will be taken that all contributing authors attest that manuscripts and material submitted to the SSSTJ are original and have not been published or submitted elsewhere and the authors concede to the open-access distribution of the manuscript, including all content contained therein.</p> <div> <h3><strong>Open Access Journal – SSSTJ (An International Journal)</strong></h3> </div> <div> <p><strong>Editor-in-Chief:</strong> Assoc. Prof. Dr. Narong Sangwaranatee, Suan Sunandha Rajabhat University (Thailand).</p> <p><strong>Open Access:</strong> meaning all content is freely accessible (without fees) online to everyone, everywhere. Journal publishes under the Creative Commons Attribution License (CC BY).</p> <p>SSSTJ has both online and printing versions.<br />ISSN 2351-0889 (Print)<br />e-ISSN 2539-5742 (Online)<br /><br />SSSTJ is an international, cross-disciplinary, scholarly and open access journal of science and technology. The focus is to publish papers on state-of–the-art science and technology.</p> <p><strong>Fast Publications:</strong> The published research manuscripts are peer-reviewed and a first decision provided to authors within 30-60 days after submission.</p> </div> <div> <h3>General Information</h3> <p>The Suan Sunandha Science and Technology Journal (SSSTJ) is a double-blind peer-reviewed (at least two reviewers) scientific journal published twice a year (January and July) by the Faculty of Science and Technology, Suan Sunandha Rajabhat University. Submissions of manuscripts should be sent to the Editor of the SSSTJ by online system: http://www.ssstj.sci.ssru.ac.th. The manuscript will be taken that all contributing authors attest that manuscripts and material submitted to the SSSTJ are original and have not been published or submitted elsewhere and the authors concede to the open-access distribution of the manuscript, including all content contained therein.</p> </div> <div> <h3>Aim and Scope</h3> <p>Suan Sunandha Science and Technology Journal (SSSTJ) is an international academic journal that gains foothold at Suan Sunandha Rajabhat University, Thailand and opens to scientific communications in Southeast Asia, Asia and worldwide. It aims to contribute significant articles in science and technology researches. Published papers are focus on state of the art science and technology. Committee of the journal and association will review submitted papers. The authors may include researchers, managers, operators, students, teachers and developers.<br /><br />Following areas are considered for publication:</p> <div class="panel-heading"> <strong>Areas of Publications</strong></div> <div class="list-group"><a class="list-group-item"> Biology (BI)</a><a class="list-group-item"> Biotechnology (BT)</a><a class="list-group-item"> Environmental Science and Technology (EN)</a><a class="list-group-item"> Food Science and Technology (FT)</a><a class="list-group-item"> Microbiology (MI)</a><a class="list-group-item"> Applied Science (AS)</a><a class="list-group-item"> Computer Science and Information Technology (CS)</a><a class="list-group-item"> Other related fields (OF)</a></div> <h3>Publication Frequency</h3> </div> <div> <p>Two issues per year as follows:<br />1<sup>st</sup> issue: January<br />2<sup>nd</sup> issue: July</p> </div> <div> <h3>Access and Publication Fees</h3> <p>The Suan Sunandha Rajabhat University Journal of Science and Technology (SSSTJ) are published by the Department of Science and Technology of Suan Sunandha Rajabhat University, Bangkok (Thailand) on a non-profit basis, offering the following:</p> <ul> <li>All articles published open access (free of charge) will be immediately and permanently free for everyone to read, download, copy and distribute</li> <li>No university library or individual reader have to pay a subscription fee or buy access to access the articles published in the journal</li> <li>Authors do not need to pay any article submission or processing charges</li> </ul> <h3>Reprints</h3> </div> <div> <p>Please contact <a href="mailto:ssstj.contact@gmail.com">ssstj.contact@gmail.com</a> for more information on how to get the reprints of journal.</p> </div> Department of Science and Technology of Suan Sunandha Rajabhat University en-US Suan Sunandha Science and Technology Journal 2351-0889 Evaluating a Small-scale Membrane Technology for Removing Salinity in Village Water Supply at Dan Kuntot, Nakhon Ratchasima https://li02.tci-thaijo.org/index.php/ssstj/article/view/795 <p>This study evaluates the use of a solar-powered membrane separation device to remove salinity from a village water supply in Dan Kuntot District. Water quality from surface water, freshwater, and tap water were tested for pH, temperature, turbidity, salinity, conductivity, and total dissolved solids (TDS). The results showed that surface water had high levels of salinity (1.6-2.1 ppt), conductivity (3495-3982 µS/cm, and TDS (2097-2351 mg/L). The surface water had a pH in the range of 5.7 to 6.2, temperatures of 27.6 to 29.3 Celsius, and turbidity of 6.8 to 10.1 NTU. The freshwater from the village water supply had a comparable pH (5.5-6.9).&nbsp; Turbidity levels were low (0.25-0.27 NTU). Conductivity and TDS levels were a bit lower to 3342-3415 µS/cm and 2005-2049 mg/L, respectively. Salinity levels remained high, 1.6 ppt. The village water treatment process cannot remove salt molecules. The tap water had an undetected salinity level after the freshwater passed through the membrane device. Conductivity and TDS were much lower, ranging from 14 to 19 µS/cm and 9 to 12 mg/L, respectively. The solar-powered small membrane separation could remove salinity as high as 2.1 ppt down to undetected level. The device could separate salt molecules using membrane technology, significantly reducing salinity levels in the tap water. Conductivity and TDS levels were also considerably lower in the tap water, with more than a 99 percent reduction. However, the produced water had low pH levels. Adding alkalinity would bring the pH close to neutral.</p> Saranbhak Chuersuwan Hathairath Techapanyarak Nirat Phutadmark Copyright (c) 2025 Suan Sunandha Rajabhat University https://creativecommons.org/licenses/by/4.0 2025-03-13 2025-03-13 12 1 1 6 10.53848/ssstj.v12i1.795 Passion Fruit Juice Beads Production by Reverse Spherification Technique: Effect of Concentration and Soaking Time of Calcium Lactate Solution https://li02.tci-thaijo.org/index.php/ssstj/article/view/823 <p>This research investigates the impact of calcium lactate concentration and soaking time on the qualities of passion fruit juice beads produced through reverse spherification. Passion fruit juice, xanthan gum, and calcium lactate are dropped into a sodium alginate solution to form beads, which are then immersed in a 0.5-1.0% (w/v) calcium lactate solution for 5-10 minutes. Results indicate that beads soaked in a 1% (w/v) calcium lactate solution for 5 minutes exhibit the smallest droplet size and highest roundness. Increased calcium lactate concentration and soaking time enhance springiness, while hardness, cohesiveness, gumminess, and chewiness decrease. Sensory evaluation shows that beads soaked in a 1% (w/v) calcium lactate solution for 10 minutes have superior taste, texture, and overall preference compared to unsoaked beads.</p> Songchai Wiriyaumpaiwong Prattana Lakthong Ancharika Patpak Nathirat Nintirak Yotsapat Keawniwong Piyachat Wiriyaampaiwong Copyright (c) 2025 Suan Sunandha Rajabhat University https://creativecommons.org/licenses/by/4.0 2025-03-13 2025-03-13 12 1 25 31 10.53848/ssstj.v12i1.823 Oxidation Behavior of Nanostructure CrAlN Thin Films https://li02.tci-thaijo.org/index.php/ssstj/article/view/874 <p>In this research, the nanostructure chromium aluminium nitride (CrAlN) thin films were prepared on silicon (100) substrate by reactive DC magnetron sputtering technique with Cr-Al alloy target and then annealing in air at different temperatures (500 - 900 °C) to investigate the oxidation behavior. The films' oxidation rate and oxidation activation energy were also calculated using parabolic relations and the Arrhenius equation. The X-ray diffraction (XRD) indicated that a solid solution CrAlN structure was found for the as-deposited thin film whereas the mixed oxide phase of Cr<sub>2</sub>O<sub>3</sub> and Cr<sub>5</sub>O<sub>12</sub> structures were discovered in the XRD spectra upon oxidation temperature at 800 °C. The XRD patterns were verified by the Energy dispersive X-ray spectroscopy (EDS) examination, which demonstrated the obvious increase of oxygen concentration at oxidation temperature from 800 °C due to the oxidation mechanism. The oxidation behavior was also confirmed by field-emission scanning electron microscopy (FE-SEM) analysis which the grain aggregation was observed while the cross-sectional microstructure of the thin films revealed that a very thin dense oxide layer was formed on the CrAlN layer. The oxide thickness increased from 648 nm to 1044 nm with increasing annealing temperature. The thin films began oxidizing above 800 °C, resulting in a porous structure. It was discovered that the as-deposited thin film exhibited a high-temperature oxidation resistance at 800 °C. The oxidation rate increased from 1.43 × 10<sup>-13</sup> to 3.78 × 10<sup>-13</sup> cm/s<sup>2</sup> and was obtained from an annealing temperature of 800 °C. The oxidation activation energy calculated from the Arrhenius plot was 99.85 kJ/mol. The nanoindentation technique also reported that the hardness of the films decreased from 15.92 to 0.03 GPa through the annealing temperature.</p> Nirun Witit-anun Adisorn Buranawong Copyright (c) 2025 Suan Sunandha Rajabhat University https://creativecommons.org/licenses/by/4.0 2025-03-13 2025-03-13 12 1 7 15 10.53848/ssstj.v12i1.874 Study of Physical and Optical Properties of Cobalt Oxide Doped Glass Prepared by Microwave Melting Technique https://li02.tci-thaijo.org/index.php/ssstj/article/view/1033 <p>This research investigates the physical and optical properties of cobalt oxide-doped glass prepared using the microwave melting technique. The glass composition was formulated according to the ratio (50-x)B<sub>2</sub>O<sub>3 </sub>: 10SiO<sub>2 </sub>: 30ZnO : 10Na<sub>2</sub>O : xCoO, where x represents the cobalt oxide concentration (0.00, 0.01, 0.05, 0.10, 0.15, and 0.20 mol%). Glass samples were prepared using the microwave melting technique, applying 1,000 watts of power for 20 minutes. The melted glass was then poured into a graphite mold and annealed at 500°C. The results showed that both density and refractive index increased with rising CoO concentration, while molar volume decreased. The absorption spectra of the glass, in the wavelength range of 250-1,100 nm, increased with higher CoO concentrations. Additionally, the CIE L*a*b* values indicated a blue color.</p> Pattraporn Saengka Nakarin Singkiburin Keerati Kirdsiri Nattapon Srisittipokakun Copyright (c) 2025 Suan Sunandha Rajabhat University https://creativecommons.org/licenses/by/4.0 2025-04-10 2025-04-10 12 1 16 24 10.53848/ssstj.v12i1.1033 Study of the effect of doping dysprosium ions in soda lime silicoborate glasses using microwave techniques for white-light-emitting diodes (WLEDs) https://li02.tci-thaijo.org/index.php/ssstj/article/view/1034 <p>Soda lime silicoborate glasses doped with dysprosium ions (Dy³⁺) were synthesized with a glass composition of 55.0B<sub>2</sub>O<sub>3</sub>: 25.0SiO<sub>2</sub>: 10.0Na<sub>2</sub>O: 10.0CaO: xDy<sub>2</sub>O<sub>3</sub> (where x represents the concentration of Dy<sub>2</sub>O<sub>3</sub>, varying from 0.0 to 2.0 mol%). The synthesis was carried out using a microwave technique and the physical, optical and luminescence properties of the obtained glasses were investigated. The results showed that the density and refractive index increased, while the molar volume decreased with higher Dy<sub>2</sub>O<sub>3</sub> concentration. The absorption spectra indicated that these glasses exhibited absorption in the UV-visible and near-infrared light regions. When excited at 388 nm, the glass emitted light at wavelengths of 481, 575, and 663 nm. The emission intensity increased with increasing Dy<sub>2</sub>O<sub>3</sub> concentration up to 0.5 mol%, after which it decreased due to the concentration quenching effect. The CIE 1931 chromaticity diagram confirmed that the glasses emitted light in the white region. Likewise, the glasses exhibited CCT values that fall within the bright white color region, with temperature values ranging from 4309 to 4393 K. The Y/B ratio was calculaed from the luminscence spectraindicating the level of asymmetry in the prepared glasses. The decay time showed a non-exponential behavior, indicating cross -relaxation between Dy<sup>3+</sup>-Dy<sup>3+</sup> ions, and the decay curve was fitted using the IH model S = 10 (quadrupole-quadrupole). The Judd-Ofelt (JO) parameters (W<sub>2</sub>, W<sub>4</sub> and W<sub>6</sub>) were calculated from the absorption spectra, and the radiative transition probabilities (A<sub>R</sub>), stimulated emission cross-sections (σ(λ<sub>p</sub>)) and branching ratios (β<sub>R</sub>) were obtained from the JO parameters. The results confirm the suitability of these glass samples for use in WLEDs and as laser medium.</p> Nattaporn Mahingsa Watcharin Rachniyom Keerati Kirdsiri Nattapon Srisittiposakun Copyright (c) 2025 Suan Sunandha Rajabhat University https://creativecommons.org/licenses/by/4.0 2025-03-13 2025-03-13 12 1 32 43 10.53848/ssstj.v12i1.1034