Limsuwan, Pichet

Preferred name

Limsuwan, Pichet

Alternative Name

Limsuwan, P.

Main Affiliation

School of Science

pichet.li@kmitl.ac.th

Now showing 1 - 10 of 76

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Enhancement of gamma and X-ray shielding behaviors in ZnO-B2O3 glasses via La2O3 addition: Experimental and theoretical investigations
(2025-12-01)
Yabsantia, S.
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Wantana, N.
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Chusin, T.
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Kaewjaeng, S.
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Ornketphon, O.
Radiation shielding materials are crucial for reducing radiation exposure. Traditional materials such as lead, and concrete pose challenges related to toxicity and lack of transparency. This study aimed to assess the effects of lanthanum oxide (La<inf>2</inf>O<inf>3</inf>) addition on physical, optical, and radiation shielding properties of ZnO–B<inf>2</inf>O<inf>3</inf> glass systems. Glass samples of (80-x)B<inf>2</inf>O<inf>3</inf>–20ZnO-xLa<inf>2</inf>O<inf>3</inf> (x = 5–20 mol%) were prepared using the melt-quenching technique and characterized for density, molar volume, refractive index, transmittance and X-ray diffraction (XRD). Gamma-ray shielding performance was evaluated using the Compton scattering method with a Cs-137 source and NaI(Tl) detector, alongside theoretical data from WinXCOM. X-ray shielding capabilities were determined through experimental transmission measurements and Monte Carlo simulations (PHITS) across effective energies ranging from 30.40 to 44.21 keV. Increasing La<inf>2</inf>O<inf>3</inf> content (5–20 mol%) resulted in higher density (2.89–3.63 g/cm3), slightly increased molar volume (29.37–33.98 cm3/mol), and higher refractive index (1.58–1.65). All La<inf>2</inf>O<inf>3</inf>-added glasses exhibited ∼75 % transmittance in the visible region. XRD analysis indicated amorphous characteristics for all samples. For gamma rays, both experimental and theoretical results agreed well, showing improved shielding with higher La<inf>2</inf>O<inf>3</inf> levels. For lowest gamma-ray energy, the 20 mol% sample had the highest mass attenuation coefficient (μ<inf>m</inf>) of 0.21 cm2/g, lowest half value layer (HVL) of 0.89 cm, and shortest mean free path (MFP) of 1.29 cm. For X-rays, PHITS simulations and experiments also aligned, with μ<inf>m</inf> up to 4.21 cm2/g (at 30.40 keV), HVL of 0.05 cm, and MFP of 0.07 cm. These findings suggest that La<inf>2</inf>O<inf>3</inf> addition enhances both gamma and X-ray shielding effectiveness. In conclusion, the study highlights the potential of La<inf>2</inf>O<inf>3</inf>-added ZnO–B<inf>2</inf>O<inf>3</inf> glass as an alternative shielding material, with future research aimed at further improving its shielding performance.
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Effect of the carbon dioxide concentration on the Refractive Index of air in a long gauge block interferometer
(2020-07-03)
Kohmun, Kanokporn
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Limsuwan, Pichet
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Ranusawud, Monludee
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Buranasiri, Prathan
In our previous work, four environment parameters including temperature, pressure, relative humidity and carbon dioxide concentration in a long gauge block interferometer chamber were measured continuously for 24 h. The refractive index of air in the chamber depending on three measured parameters was determined using the updated Edlén equation by assuming that CO<inf>2</inf> concentration is constant at 450 ppm. In this study, the carbon dioxide concentration term was added into the updated Edlén equation and four environment parameters including temperature, pressure, relative humidity and CO<inf>2</inf> concentration were measured continuously for 12 h. To characterize the influence of the carbon dioxide concentration on the refractive index of air in a long gauge block interferometer chamber, the refractive index of the chamber contents was determined using updated Edlén equations with constant and with variable carbon dioxide concentration terms. The results showed that the refractive index values obtained from the updated Edlén equations with constant and variable CO<inf>2</inf> concentration terms were equal to 1.000268244 and 1.000268261, respectively.
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Value-added asparagus (Asparagus officinalis L.) as healthy snacks using vacuum frying
(2023-01-01)
Maisont, Suchada
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Samutsri, Wisutthana
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Khamweera, Pemika
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Phae-ngam, Wuttichai
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Limsuwan, Pichet
This study investigated the possibility of using asparagus (Asparagus officinalis L.) to produce healthy snacks using vacuum frying. The tip and middle part of asparagus Grade C were soaked in 0.1% Calcium chloride solution and blanched at 95–98°C for 45 s, immediately soaked in water at 30°C for 2 min and packed in the bags to freeze at −18°C before vacuum frying. The samples were fried at 80°C and 986 mbar for 38, 40 and 42 min, and then excess oil in the sample was removed by a centrifuge before being measured properties. The effects of different frying times on the physicochemical and sensory characteristics of the vacuum-fried asparagus were analysed. A scanning electron microscope was used to study the structure of the vacuum-fried product. The result reveals that increasing frying time decreased moisture content, a<inf>w</inf>, yield, greenness value and crispiness of vacuumed snacks but increased lightness and yellowness values. SEM showed that vacuumed snacks with increasing frying time resulted in a gradual increase in the size of pores inside the product. When the frying time increased to 42 min, collapsed pores were observed, indicating a breakdown structure. A sensory evaluation of seasonings on vacuum-fried asparagus found that fried asparagus with truffle seasoning had the highest preference levels for all sensory attributes. The truffle seasoned fried asparagus at 80°C under vacuum at a pressure of 986 mbar for 40 min contained protein and fibre content of 14.21 and 15.55%, respectively, vitamin A and beta-carotene of 2.717 μg and 16.30 μg, respectively, and calcium and iron of 182.68 mg and 2.88 mg, respectively. Microorganisms found are under the regulated amount according to the Notification of the Ministry of Public Health. This study demonstrates that asparagus Grade C can be used to produce healthy and acceptable fried snacks.
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Development and Characterization of Crackers Substitution of Wheat Flour With Jellyfish
(2021-12-06)
Maisont, Suchada
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Samutsri, Wisutthana
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Phae-ngam, Wuttichai
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Limsuwan, Pichet
The objective of this study was to investigate the possibility of using jellyfish (Lobonema smithii) for the production of nutritionally improved crackers. In this study, ground jellyfish were incorporated into different levels (20, 30, and 40%) to replace wheat flour in cracker formula. Physicochemical characteristics (linear expansion, hardness, and color) and sensory quality of the developed crackers were examined and compared with control crackers. The crackers with jellyfish were found significantly darker, with more brittleness, and less consumer accepted than the control samples (p < 0.05). Moisture content, a<inf>w</inf>, and thiobarbituric acid reactive substances (TBARS)-values of jellyfish crackers increased while the hardness of the jellyfish crackers decreased with increasing the storage time for both crackers stored at 35 and 45°C. The substitution of wheat flour with jellyfish led to high protein content in the crackers. The cracker with 30% of jellyfish gained characteristics of cracker, liking scores, as well as the subjective quality of the final product and had good physical and chemical conditions, being able to be consumed for 12 weeks stored at 35°C.
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Design and simulation of asymmetric Y-junction beam splitter with controllable splitting based on adjusted air-hole defect
(2022-01-01)
Phongwisit, Phachara
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Kamoldilok, Surachart
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Buranasiri, Prathan
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Srinuanjan, Keerayoot
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Limsuwan, Pichet
We report a construction of a new asymmetric Y-junction beam splitter with a controllable splitting ratio and simulate this splitter. The splitter is based on InP, has the area 65.0 µm2 and operates at the light wavelengths 1.48 and 1.55 µm. Under condition of no air-hole defect, the splitting ratio for the output ports 1 and 2 is equal to 92/8 at the both wavelengths. To control the splitting ratio, air-hole defects with different (diamond, square and cylinder) shapes are introduced at the junction between the two output ports. Our simulations confirm that the splitting ratio of the beam splitter can be efficiently controlled by changing the size and the shape of the air-hole defect. The maximal splitting ratios at our operating wavelengths are equal to 10/90 and 14/86 and the appropriate average insertion losses amount to 0.36 and 0.31 dB for all of defect shapes.
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Effect of Gd2O3 on the radiation shielding, physical, optical and luminescence behaviors of Gd2O3–La2O3–ZnO–B2O3–Dy2O3 glasses
(2021-08-01)
Kaewjaeng, S.
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Wantana, N.
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Kothan, S.
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Rajaramakrishna, R.
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Kim, H. J.
The present work focuses on lead-free glasses, their shielding behavior, and other optical studies. The glass composition with xGd<inf>2</inf>O<inf>3</inf>+10La<inf>2</inf>O<inf>3</inf>+10ZnO+(79-x) B<inf>2</inf>O<inf>3</inf>+1Dy<inf>2</inf>O<inf>3</inf>, x = 0, 5, 10, 15, 20 mol% were prepared to the characterization on physical, absorption spectra, photo-, radioluminescence, and radiation shielding properties. In the experimental results, the density of Gd-1Dy glass samples increases with the increase of Gd3+ ions concentrations. The ten-strong peak in the 5Gd-1Dy glass of absorption spectra in UV–Vis–NIR regions. The white photoluminescence spectra base of Gd-1Dy glass samples can be generated under excitation at 351 nm makes the strongest emission of Dy3+ ions and excitation through energy transfer from Gd3+ in Gd-1Dy glass samples with 275 and 351 nm. This strong white emission of Dy3+ ions also strong in x-ray luminescence and performs the integral scintillation efficiency of 33% when compared with BGO crystal. The radiation shielding properties in the diagnostic medicine energies region are correlated, the values of glass samples better than commercial windows, bricks, and concrete. The HVL values of glass sample at 15 and 20 mol% of Gd<inf>2</inf>O<inf>3</inf> has been found better than X-ray windows. The corollaries of Gd-1Dy glass samples can be a candidate for radiation detector and lead-free radiation shielding materials in future.
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THE DEVELOPMENT OF SM3+ DOPED BARIUM TITANIUM BISMUTH BORATE GLASS FOR ORANGE EMISSION MATERIAL APPLICATION
(2025-01-01)
Jarucha, Nawarut
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Ruangtaweep, Yotsakit
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Meejitpaisan, Piyachat
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Limsuwan, Pichet
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Kim, Hong Joo
SM3+–doped borate glasses were synthesized using the melt–quenching method, and luminescence characteristics were systematically investigated. Initially, the glass composition was modified by varying the Bi<inf>2</inf>O<inf>3</inf> content while maintaining the SM3+ concentration at 1.00 mol%. Optical absorption measurements revealed that BiBaTB1Sm glasses exhibited a prominent peak at 401 nm in the visible region, which was selected as the excitation wavelength for photoluminescence analysis. The emission spectra demonstrated a maximum intensity at 598 nm under 401 nm excitation. Notably, the glass sample without Bi<inf>2</inf>O<inf>3</inf> showed stronger emission compared to the Bi<inf>2</inf>O<inf>3</inf>-doped counterparts. In a separate study, the SM3+ concentration was varied (0.0, 0.1, 0.5, 1.0, and 2.0 mol%) to examine its effect on luminescence properties. luminescence intensity enhanced as the Sm content increased to 0.5 mol% before decreasing at higher concentrations due to the concentration quenching effect. Additionally, fluorescence decay time measurements indicated a reduction in lifetime with increasing SM3+ content, attributed to energy transfer via cross-relaxation mechanisms. The CIE diagram confirmed that Sm<inf>2</inf>O<inf>3</inf>-doped glass emitted orange light. These findings suggest that SM3+-doped borate glasses hold promise for applications in orange-emitting photonic devices.
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Williamson-Hall analysis of lattice strain in green-synthesized ZnO nanoparticles using Mitragyna speciosa extract: microstructural insights and antibacterial application
(2026-07-01)
Thongpool, Voranuch
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Phunpueok, Akapong
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Jaiyen, Sarawut
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Limsuwan, Pichet
Green synthesis is a sustainable method for producing ZnO NPs. However, detailed microstructural interpretation remains limited. In this study, ZnO NPs were synthesized using Mitragyna speciosa leaf extract and systematically analyzed with emphasis on lattice characteristics. Structural and morphological analysis using UV–vis, FTIR, FESEM-EDS, and XRD techniques confirmed the formation of highly crystalline ZnO with a hexagonal wurtzite structure. Williamson-Hall (W-H) analysis was applied using three deformation models: UDM, USDM, and UDEDM to separate crystallite size and lattice strain components of the crystal structure. The results revealed relatively large crystallite sizes (∼39–43 nm) with low microstrain (2.09–2.30 × 10⁻3) and low deformation energy density (3.1 × 10⁻4 J m⁻3), suggesting comparatively low lattice strain characteristics. The optical band gap obtained from the Tauc plot analysis is approximately 3.03 eV, consistent with the properties of the ZnO semiconductor. Antibacterial activity was evaluated as a preliminary functional assessment, showing typical Gram-dependent behavior. This work highlights the applicability of W–H analysis for detailed microstructural evaluation in green-synthesized ZnO NPs.
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Optically stimulated luminescence dating using the quartz inclusion method of earthenware from the Nam Tok Khao Pang archaeological site, Kanchanaburi, Thailand
(2025-08-28)
Phetkongtong, Thananan
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Klubket, Peerasak
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Pailoplee, Santi
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Limsuwan, Pichet
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Phunpueok, Akapong
The Nam Tok Khao Pang archaeological site, located in Tha Sao subdistrict, Sai Yok district, Kanchanaburi province, Thailand, is a limestone cave where numerous artifacts, including black-burnished earthenware fragments with in-curving rims, out-curving rims, and carinated bodies, have been discovered. Mineralogical and microstructural analyses using X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDS), and scanning electron microscopy (SEM) identified quartz (SiO₂) as the dominant mineral phase within a partially sintered silicate matrix. The absence of vitrification and the presence of mineral impurities indicate that the earthenware was fired at temperatures between 900°C and 1000°C. To determine the age of these ceramics, optically stimulated luminescence (OSL) dating was conducted on three black-burnished earthenware fragments using the quartz inclusion method and the single aliquot regeneration (SAR) protocol. Annual dose rates were estimated from uranium (U), thorium (Th), and potassium (K) concentrations measured by laser ablation–inductively coupled plasma mass spectrometry (LA-ICP-MS). The individual OSL ages obtained were 3.591 ± 0.63 ka, 3.479 ± 0.74 ka, and 3.717 ± 0.73 ka, yielding an average age of approximately 3.59 ± 0.34 ka. This places the artifacts within the Late Neolithic to Middle–Late Bronze Age period. These findings are consistent with the typological characteristics of the earthenware and align with radiocarbon dates obtained from charcoal collected from black-burnished earthenware vessels at the Ban Kao site, which also fall within the Late Neolithic period. This correlation supports the chronological framework of prehistoric settlement in the region and highlights the reliability of OSL dating for ceramic artifacts in tropical archaeological contexts.
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Drying edible jellyfish (Lobonema smithii) using a parabolic greenhouse solar dryer
(2022-12-01)
Maisont, S.
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Samutsri, W.
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Sansomboon, A.
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Limsuwan, P.
Thailand is one of Southeast Asia’s top exporters of salted edible jellyfish. Jellyfish products are generally exported in the form of semi-dried jellyfish. A recent survey on jellyfish distribution in coastal areas in the Gulf of Thailand and the Andaman Sea indicated that most edible jellyfish in the area belong to Lobonema smithii and Rhopilema hispidum. Drying is an alternative method to preserve food products. In this work, parabolic roof shape greenhouse solar drying of edible jellyfish (Lobonema smithii) was studied, and the quality of the dried jellyfish was assessed. The solar dryer system has a 300 kg loading capacity for jellyfish and the resulting dried and rehydrated jellyfish products are described. The moisture content of dried jellyfish decreased to 7.05-11.70% (wb) from 91-92% (wb) after drying for three days and the protein, fat, crude fibre, ash, and carbohydrate content of the dried jellyfish were 68.68%, 0.74%, 0.43%, 9.27%, and 4.67%, respectively. The moisture of the rehydrated jellyfish increased to 37.67-39.07% (wb) after soaking in distilled water for 5 hrs. In terms of colour, the rehydrated jellyfish products were found to be highly similar to salted jellyfish products.

Limsuwan, Pichet

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