Marisa Takong, Benjarath Waytathum, P. Wannasut, A. Watcharapasorn
This work aims to study the effects of Co-doping in Cu-site of PrBa2(Cu1-xCox)3O7-y (PrBCO) ceramics (where x = 0.05, 0.10, 0.15, 0.17 and 0.20) on thermoelectric (TE) properties at high temperature. The result of solid-state reaction synthesis of Co-doped PrBCO compounds was optimally obtained at 900 °C for 16 h. Then, the powder was compacted into pellets by uniaxial press and sintered at 920 °C for 16 h and the crystalline structure was confirmed using X-ray diffractometry (XRD). The XRD data underwent Rietveld refinement employing the GSAS II program for a detailed analysis of phase composition and crystal structure. Microstructural characteristics and chemical composition were investigated through scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS), respectively. The high-temperature thermoelectric properties, particularly electrical conductivity (), Seebeck coefficient () and thermal conductivity (ĸ) were also measured, and the figure of merit (ZT) was calculated to determine the thermoelectric performance of the compounds. The measured bulk density, determined through air and xylene displacement exceeded 90% of theoretical value. It was observed that Co-doping in the Cu-site of PrBCO led to an increased value of the Seebeck coefficient (), resulting in the ZT value tending to increase, particularly as the temperature rised. However, the electrical conductivity (σ) decreased, which was inversely related to due to the reduction in carrier concentration. The power factor (PF) showed relatively high values over a broad temperature range for undoped and x=0.05 Co-doped samples. Furthermore, considering the thermal conductivity (κ), it was found that κ decreased after Co was added to PrBCO, due to the lattice structure being disturbed and causing increased phonon scattering. The sample with x = 0.05 exhibited the highest ZT value of 0.028 at 873 K, while the sample with x = 0.17 had the highest ZT value of 0.021 at 673 K.
这项工作旨在研究在 PrBa2(Cu1-xCox)3O7-y（PrBCO）陶瓷（其中 x = 0.05、0.10、0.15、0.17 和 0.20）的铜位掺杂 Co 对高温热电特性的影响。掺 Co 的 PrBCO 化合物在 900 ℃、16 小时的固态反应合成过程中获得了最佳结果，然后用单轴压力机将粉末压制成颗粒，并在 920 ℃、16 小时的烧结过程中使用 X 射线衍射仪（XRD）确认了结晶结构。利用 GSAS II 程序对 XRD 数据进行了里特维尔德细化，以详细分析相组成和晶体结构。扫描电子显微镜（SEM）和能量色散 X 射线光谱（EDS）分别对微观结构特征和化学成分进行了研究。此外，还测量了高温热电性能，特别是电导率（）、塞贝克系数（）和热导率（ĸ），并计算了优点系数（ZT），以确定化合物的热电性能。通过空气和二甲苯置换测定的体积密度超过了理论值的 90%。据观察，在 PrBCO 的铜位掺入 Co 会导致塞贝克系数 () 增加，从而使 ZT 值趋于增加，尤其是当温度升高时。然而，由于载流子浓度降低，电导率（σ）下降，与 成反比。在较宽的温度范围内，未掺杂和 x=0.05 Co 掺杂样品的功率因数（PF）显示出相对较高的值。此外，考虑到热导率 (κ)，发现在 PrBCO 中添加 Co 后，κ 会降低，这是由于晶格结构受到干扰，导致声子散射增加。x = 0.05 的样品在 873 K 时的 ZT 值最高，为 0.028，而 x = 0.17 的样品在 673 K 时的 ZT 值最高，为 0.021。
{"title":"Effects of Co Concentration on Structure and Thermoelectric Properties of PrBa2(Cu1-xCox)3O7-y Ceramics","authors":"Marisa Takong, Benjarath Waytathum, P. Wannasut, A. Watcharapasorn","doi":"10.12982/cmjs.2024.066","DOIUrl":"https://doi.org/10.12982/cmjs.2024.066","url":null,"abstract":"This work aims to study the effects of Co-doping in Cu-site of PrBa2(Cu1-xCox)3O7-y (PrBCO) ceramics (where x = 0.05, 0.10, 0.15, 0.17 and 0.20) on thermoelectric (TE) properties at high temperature. The result of solid-state reaction synthesis of Co-doped PrBCO compounds was optimally obtained at 900 °C for 16 h. Then, the powder was compacted into pellets by uniaxial press and sintered at 920 °C for 16 h and the crystalline structure was confirmed using X-ray diffractometry (XRD). The XRD data underwent Rietveld refinement employing the GSAS II program for a detailed analysis of phase composition and crystal structure. Microstructural characteristics and chemical composition were investigated through scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS), respectively. The high-temperature thermoelectric properties, particularly electrical conductivity (), Seebeck coefficient () and thermal conductivity (ĸ) were also measured, and the figure of merit (ZT) was calculated to determine the thermoelectric performance of the compounds. The measured bulk density, determined through air and xylene displacement exceeded 90% of theoretical value. It was observed that Co-doping in the Cu-site of PrBCO led to an increased value of the Seebeck coefficient (), resulting in the ZT value tending to increase, particularly as the temperature rised. However, the electrical conductivity (σ) decreased, which was inversely related to due to the reduction in carrier concentration. The power factor (PF) showed relatively high values over a broad temperature range for undoped and x=0.05 Co-doped samples. Furthermore, considering the thermal conductivity (κ), it was found that κ decreased after Co was added to PrBCO, due to the lattice structure being disturbed and causing increased phonon scattering. The sample with x = 0.05 exhibited the highest ZT value of 0.028 at 873 K, while the sample with x = 0.17 had the highest ZT value of 0.021 at 673 K.","PeriodicalId":9884,"journal":{"name":"Chiang Mai Journal of Science","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141795166","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Realita Dini Mustika, N. H. Aprilita, Dwi Siswanta
T his study aimed to synthesize a new chemosensor, namely 1,1’-(1,4-phenylene)bis(3-(4-nitrophenyl)thiourea), specifically designed for detection of H2PO4−. The compound was characterized using FTIR, LC-MS, 1H NMR, and 13C NMR, while the colorimetric sensing abilities were validated through various analyses. These include linearity, limit of detection (LOD), limit of quantification (LOQ), precision, and accuracy using UV-Vis spectrophotometry, RGB, and HSV color components. Digital images of color changes were captured using a smartphone camera and Color Grab app was used to quantify color components. Subsequently, anions test (NO3−, Cl–, HSO4−, and H2PO4−) were conducted in acetonitrile, where the addition of H2PO4− induced a distinct color change from colorless to yellow. The results showed that detection of H2PO4− depended on pH of the solution, with no color change observed at pH 1-3 due to anions converting to acidic species. At pH 5, H2PO4− was detected as a yellow color change, and alkaline conditions led to different color responses. Furthermore, UV-Vis detection showed recovery values of 99.80% to 100.6%, indicating high accuracy. RGB and HSV color component-based sensors showed recovery values of 101.6% to 114.4% and 92.50% to 110.2%, respectively. The LOD of the UV-Vis, RGB, and HSV methods were 0.16 μM, 0.46 μM, and 0.18 μM, while LOQ values were 0.54 μM,1.52 μM, and 0.61 μM, respectively. In conclusion, the synthesized chemosensor showed potential for accurate and sensitive detection of H2PO4− using UV-Vis spectrophotometry and digital colorimetric-based image.
{"title":"The Development of Digital Colorimetric-Based Thiourea Receptor for Highly Sensitive Detection of Dihydrogen Phosphate","authors":"Realita Dini Mustika, N. H. Aprilita, Dwi Siswanta","doi":"10.12982/cmjs.2024.056","DOIUrl":"https://doi.org/10.12982/cmjs.2024.056","url":null,"abstract":"T his study aimed to synthesize a new chemosensor, namely 1,1’-(1,4-phenylene)bis(3-(4-nitrophenyl)thiourea), specifically designed for detection of H2PO4−. The compound was characterized using FTIR, LC-MS, 1H NMR, and 13C NMR, while the colorimetric sensing abilities were validated through various analyses. These include linearity, limit of detection (LOD), limit of quantification (LOQ), precision, and accuracy using UV-Vis spectrophotometry, RGB, and HSV color components. Digital images of color changes were captured using a smartphone camera and Color Grab app was used to quantify color components. Subsequently, anions test (NO3−, Cl–, HSO4−, and H2PO4−) were conducted in acetonitrile, where the addition of H2PO4− induced a distinct color change from colorless to yellow. The results showed that detection of H2PO4− depended on pH of the solution, with no color change observed at pH 1-3 due to anions converting to acidic species. At pH 5, H2PO4− was detected as a yellow color change, and alkaline conditions led to different color responses. Furthermore, UV-Vis detection showed recovery values of 99.80% to 100.6%, indicating high accuracy. RGB and HSV color component-based sensors showed recovery values of 101.6% to 114.4% and 92.50% to 110.2%, respectively. The LOD of the UV-Vis, RGB, and HSV methods were 0.16 μM, 0.46 μM, and 0.18 μM, while LOQ values were 0.54 μM,1.52 μM, and 0.61 μM, respectively. In conclusion, the synthesized chemosensor showed potential for accurate and sensitive detection of H2PO4− using UV-Vis spectrophotometry and digital colorimetric-based image.","PeriodicalId":9884,"journal":{"name":"Chiang Mai Journal of Science","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141795362","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. Sudsanguan, R. Shivas, Y. Tan, C. Doungsa-ard, Khonesavane Chittarath, Chhun Hy Heng, Sarunya Nalumpang
Peronosclerospora species cause downy mildew diseases on maize (Zea mays) worldwide. Maize leaves with symptoms of downy mildew were collected from field crops in Cambodia, Lao PDR, and Thailand, during surveys between 2018 and 2022. Initial determination of the presence of downy mildew on specimens was determined microscopically by the presence of conidiophores and/or oospores in leaf tissue. Phylogenetic analyses of the cytochrome c oxidase subunit II (cox2) gene sequences showed that all specimens were Peronosclerospora neglecta. Reference specimens from Thailand were deposited at the Thai Plant Pathology Herbarium, Bangkok, Thailand, while those from Cambodia and Lao PDR were deposited at the Queensland Plant Pathology Herbarium, Australia. Peronosclerospora neglecta was widespread in field crops of maize in Cambodia, Lao PDR, and Thailand during the survey period. This is the first time that P. neglecta has been reported in Cambodia and Lao PDR.
Peronosclerospora 菌种会在全球范围内引起玉米（玉米）霜霉病。在 2018 年至 2022 年期间的调查中，从柬埔寨、老挝人民民主共和国和泰国的田间作物中收集了具有霜霉病症状的玉米叶片。通过显微镜观察叶片组织中是否存在分生孢子和/或卵孢子，初步确定标本上是否存在霜霉病。细胞色素 c 氧化酶亚单位 II（cox2）基因序列的系统发育分析表明，所有标本均为 Peronosclerospora neglecta。泰国的参考标本保存在泰国曼谷的泰国植物病理学标本馆，柬埔寨和老挝人民民主共和国的参考标本保存在澳大利亚昆士兰植物病理学标本馆。在调查期间，Peronosclerospora neglecta 在柬埔寨、老挝和泰国的玉米田间作物中广泛传播。这是柬埔寨和老挝人民民主共和国首次报告 P. neglecta。
{"title":"Maize Downy Mildew (Peronosclerospora neglecta) in Cambodia, Lao PDR, and Thailand","authors":"M. Sudsanguan, R. Shivas, Y. Tan, C. Doungsa-ard, Khonesavane Chittarath, Chhun Hy Heng, Sarunya Nalumpang","doi":"10.12982/cmjs.2024.062","DOIUrl":"https://doi.org/10.12982/cmjs.2024.062","url":null,"abstract":"Peronosclerospora species cause downy mildew diseases on maize (Zea mays) worldwide. Maize leaves with symptoms of downy mildew were collected from field crops in Cambodia, Lao PDR, and Thailand, during surveys between 2018 and 2022. Initial determination of the presence of downy mildew on specimens was determined microscopically by the presence of conidiophores and/or oospores in leaf tissue. Phylogenetic analyses of the cytochrome c oxidase subunit II (cox2) gene sequences showed that all specimens were Peronosclerospora neglecta. Reference specimens from Thailand were deposited at the Thai Plant Pathology Herbarium, Bangkok, Thailand, while those from Cambodia and Lao PDR were deposited at the Queensland Plant Pathology Herbarium, Australia. Peronosclerospora neglecta was widespread in field crops of maize in Cambodia, Lao PDR, and Thailand during the survey period. This is the first time that P. neglecta has been reported in Cambodia and Lao PDR.","PeriodicalId":9884,"journal":{"name":"Chiang Mai Journal of Science","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141795239","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Phouthanouthong Xaysombath, N. Soykeabkaew, D. Wattanasiriwech, S. Wattanasiriwech
This study presents a comprehensive evaluation of the effects of the refining level of recycled pulp from beverage cartons (RPBC) on the properties of its cementitious composite. The RPBC with various freeness levels, ranging from 400 to 650 mL of the Canadian Standard Freeness test method (CSF), was prepared using a high-speed fruit blender. The specimens were formed by the slurry de-watering method with 8wt% fiber content and mortar matrix with a sand-to-cement ratio of 1:1. The key findings reveal that the cementitious composites reinforced with the RPBC exhibited a maximum value of flexural strength of 11.17 MPa and the freeness of 550 mL CSF. The fracture toughness values of the RPBC composites were significantly improved compared to that of the control specimen. However, the values decreased by about 14% to 20 % as the freeness reduced from 650 to 400 mL CSF. The bulk density and porosity of the RPBCC were not significantly affected by the freeness of RPBC.
{"title":"Properties of Cementitious Composite Reinforced with Recycled Pulp from Beverage Cartons","authors":"Phouthanouthong Xaysombath, N. Soykeabkaew, D. Wattanasiriwech, S. Wattanasiriwech","doi":"10.12982/cmjs.2024.063","DOIUrl":"https://doi.org/10.12982/cmjs.2024.063","url":null,"abstract":"This study presents a comprehensive evaluation of the effects of the refining level of recycled pulp from beverage cartons (RPBC) on the properties of its cementitious composite. The RPBC with various freeness levels, ranging from 400 to 650 mL of the Canadian Standard Freeness test method (CSF), was prepared using a high-speed fruit blender. The specimens were formed by the slurry de-watering method with 8wt% fiber content and mortar matrix with a sand-to-cement ratio of 1:1. The key findings reveal that the cementitious composites reinforced with the RPBC exhibited a maximum value of flexural strength of 11.17 MPa and the freeness of 550 mL CSF. The fracture toughness values of the RPBC composites were significantly improved compared to that of the control specimen. However, the values decreased by about 14% to 20 % as the freeness reduced from 650 to 400 mL CSF. The bulk density and porosity of the RPBCC were not significantly affected by the freeness of RPBC.","PeriodicalId":9884,"journal":{"name":"Chiang Mai Journal of Science","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141795890","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Termitomyces flavus, collected from rainforest of northern Thailand, is described and discussed as novel species using morphological characters and phylogenetic analyses (ITS, nrLSU, and mtSSU). The novel taxa is brownish orange to brownish yellow with large basidiomata, dark and papilla perforatorium, abundant yellowish grey squamulose on the stipe surface, and bulbous at the base, thick pileus context, and broadly ellipsoid to ellipsoid basidiospores 6.0–8.8 × 4.1–6.2 μm.
{"title":"Termitomyces flavus sp. nov. (Lyophyllaceae, Agaricales), a New Species from Northern Thailand","authors":"Songming Tang, Er-Xian Li, Hong-Mei Luo, Cheng-Ce Ao, Tong Lv, Shu-Hong Li","doi":"10.12982/cmjs.2024.060","DOIUrl":"https://doi.org/10.12982/cmjs.2024.060","url":null,"abstract":"Termitomyces flavus, collected from rainforest of northern Thailand, is described and discussed as novel species using morphological characters and phylogenetic analyses (ITS, nrLSU, and mtSSU). The novel taxa is brownish orange to brownish yellow with large basidiomata, dark and papilla perforatorium, abundant yellowish grey squamulose on the stipe surface, and bulbous at the base, thick pileus context, and broadly ellipsoid to ellipsoid basidiospores 6.0–8.8 × 4.1–6.2 μm.","PeriodicalId":9884,"journal":{"name":"Chiang Mai Journal of Science","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141795322","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Lijuan Zhang, Jian Ma, Tianming Zhao, Meiyan Han, Dege Zheng, R. Jayawardena, A. Mapook, Yongzhong Lu
In this study, five metabolites were successfully isolated from the culture medium of Tubeufia longihelicospora strain GZCC 23-0405, comprising two dimeric naphtha-γ-pyrones (1–2), two dimeric coumarins (3–4), and one alkaloid (5). The elucidation of their chemical structures relied on a combination of NMR, MS, and optical rotation methods. Interestingly, these compounds represent the first instances of such metabolites being isolated from helicosporous hyphomycetes. Additionally, compounds (1) and (2) exhibited significant antimicrobial potential, with MIC and MBC values of 62.0 μg mL-1 and 248 μg mL-1, respectively, against Pseudomonas aeruginosa. This study provides a comprehensive account of the extraction, isolation, structural characterization, and antimicrobial properties of these compounds, shedding light on their potential significance in the field of natural product research.
本研究从 Tubeufia longihelicospora 菌株 GZCC 23-0405 的培养液中成功分离出五种代谢物，包括两种二聚石脑油-γ-吡喃酮（1-2）、两种二聚香豆素（3-4）和一种生物碱（5）。这些化合物的化学结构是通过核磁共振、质谱和旋光等方法综合阐明的。有趣的是，这些化合物是首次从单孢真菌中分离出的此类代谢物。此外，化合物（1）和（2）表现出显著的抗菌潜力，对铜绿假单胞菌的 MIC 和 MBC 值分别为 62.0 μg mL-1 和 248 μg mL-1。本研究全面介绍了这些化合物的提取、分离、结构表征和抗菌特性，揭示了它们在天然产物研究领域的潜在意义。
{"title":"Antimicrobial Metabolites from the Freshwater Fungus Tubeufia longihelicospora Strain GZCC 23-0405","authors":"Lijuan Zhang, Jian Ma, Tianming Zhao, Meiyan Han, Dege Zheng, R. Jayawardena, A. Mapook, Yongzhong Lu","doi":"10.12982/cmjs.2024.053","DOIUrl":"https://doi.org/10.12982/cmjs.2024.053","url":null,"abstract":"In this study, five metabolites were successfully isolated from the culture medium of Tubeufia longihelicospora strain GZCC 23-0405, comprising two dimeric naphtha-γ-pyrones (1–2), two dimeric coumarins (3–4), and one alkaloid (5). The elucidation of their chemical structures relied on a combination of NMR, MS, and optical rotation methods. Interestingly, these compounds represent the first instances of such metabolites being isolated from helicosporous hyphomycetes. Additionally, compounds (1) and (2) exhibited significant antimicrobial potential, with MIC and MBC values of 62.0 μg mL-1 and 248 μg mL-1, respectively, against Pseudomonas aeruginosa. This study provides a comprehensive account of the extraction, isolation, structural characterization, and antimicrobial properties of these compounds, shedding light on their potential significance in the field of natural product research.","PeriodicalId":9884,"journal":{"name":"Chiang Mai Journal of Science","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141795882","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Wongsathon Musikpan, Warunee Khampa, Woraprom Passatorntaschakorn, Chukwuebuka Usulor, A. Ngamjarurojana, A. Gardchareon, P. Ruankham, D. Wongratanaphisan
Org anic-inorganic hybrid perovskites have captivated the attention of researchers worldwide due to their remarkable potential for low-cost, high-efficiency solar cells. However, the reliance on controlled environments, such as dry boxes, poses a significant barrier for smaller laboratories wishing to participate in perovskite research. In this study, we investigate the influence of ambient humidity of Cs0.17FA0.83Pb(I0.83Br0.17)3 during the film formation process. Our experiments involved the fabrication of perovskite films using spin-coating techniques under different controlled humidity conditions with identical precursor preparation. The results revealed a significant decrease in film thickness under higher humidity, accompanied by a noticeable alteration in perovskite grain morphology, suggesting a complex interplay between humidity and grain formation. Furthermore, the photovoltaic performance of device with perovskite film formed in different humidity was measured. Surprisingly, despite the challenges posed by high humidity during fabrication, the solar cell efficiency only moderately decreased from 13.17% to 9.55% in average, indicating a remarkable potential of the Cs0.17FA0.83Pb(I0.83Br0.17)3 perovskite formula under adverse ambient conditions. These findings hint at the feasibility of their application in real-world, ambient air conditions, paving the way for their integration into diverse environmental settings, enabling a wider research community to engage in the exciting realm of perovskite solar cell technology.
{"title":"Humidity Effects on Cs0.17FA0.83Pb(I0.83Br0.17)3 Thin Films for Carbon-based Perovskite Solar Cells","authors":"Wongsathon Musikpan, Warunee Khampa, Woraprom Passatorntaschakorn, Chukwuebuka Usulor, A. Ngamjarurojana, A. Gardchareon, P. Ruankham, D. Wongratanaphisan","doi":"10.12982/cmjs.2024.058","DOIUrl":"https://doi.org/10.12982/cmjs.2024.058","url":null,"abstract":"Org anic-inorganic hybrid perovskites have captivated the attention of researchers worldwide due to their remarkable potential for low-cost, high-efficiency solar cells. However, the reliance on controlled environments, such as dry boxes, poses a significant barrier for smaller laboratories wishing to participate in perovskite research. In this study, we investigate the influence of ambient humidity of Cs0.17FA0.83Pb(I0.83Br0.17)3 during the film formation process. Our experiments involved the fabrication of perovskite films using spin-coating techniques under different controlled humidity conditions with identical precursor preparation. The results revealed a significant decrease in film thickness under higher humidity, accompanied by a noticeable alteration in perovskite grain morphology, suggesting a complex interplay between humidity and grain formation. Furthermore, the photovoltaic performance of device with perovskite film formed in different humidity was measured. Surprisingly, despite the challenges posed by high humidity during fabrication, the solar cell efficiency only moderately decreased from 13.17% to 9.55% in average, indicating a remarkable potential of the Cs0.17FA0.83Pb(I0.83Br0.17)3 perovskite formula under adverse ambient conditions. These findings hint at the feasibility of their application in real-world, ambient air conditions, paving the way for their integration into diverse environmental settings, enabling a wider research community to engage in the exciting realm of perovskite solar cell technology.","PeriodicalId":9884,"journal":{"name":"Chiang Mai Journal of Science","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141795121","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
W. Parklak, Amaraporn Rerkasem, Suwinai Sangyo, Sasinat Pongtam, S. Buranapin, K. Rerkasem
Hyperglycemia among hospitalized patients is associated with an increased risk of mortality and infectious complications. In critically ill patients, hyperglycemia often occurs as a physiological response to stress. For critically ill patients who require nutrition support but have severe malabsorption or intolerance to polymeric formulas, oligomeric formulas may be beneficial. However, hyperglycemia might be a concern with these oligomeric formulas. This study aimed to determine the glycemic index (GI) of a test food, TOP-OP13NPD, a high-protein peptide-based enteral formula. The GI value of TOP-OP13NPD was determined following the protocols outlined in the International Organization for Standardization 26642:2010, involving 10 healthy adults (with an equal proportion of males and females). Both the reference glucose and test food provided 50 g of carbohydrates, and participants’ blood glucose levels were monitored for two hours. After consuming TOP-OP13NPD at 15, 30, 45, and 60 minutes, subjects exhibited significantly lower blood glucose levels than those on the glucose reference diet (p < 0.001). The incremental area under the curve at 120 minutes was also significantly lower compared to the glucose reference diet (1,380.08 ± 276.48 and 3,082.59 ± 677.16 mg × min/dL; p < 0.01). The mean ± SEM GI value of the test food was 48.62 ± 5.86. TOP-OP13NPD is classified as a low glycemic index diet. This result suggests that this formula may be suitable for individuals requiring oligomeric enteral nutrition who need to control their blood glucose levels.
{"title":"Measurement of Glycemic Index: A High-Protein Peptide-Based Enteral Formula","authors":"W. Parklak, Amaraporn Rerkasem, Suwinai Sangyo, Sasinat Pongtam, S. Buranapin, K. Rerkasem","doi":"10.12982/cmjs.2024.057","DOIUrl":"https://doi.org/10.12982/cmjs.2024.057","url":null,"abstract":"Hyperglycemia among hospitalized patients is associated with an increased risk of mortality and infectious complications. In critically ill patients, hyperglycemia often occurs as a physiological response to stress. For critically ill patients who require nutrition support but have severe malabsorption or intolerance to polymeric formulas, oligomeric formulas may be beneficial. However, hyperglycemia might be a concern with these oligomeric formulas. This study aimed to determine the glycemic index (GI) of a test food, TOP-OP13NPD, a high-protein peptide-based enteral formula. The GI value of TOP-OP13NPD was determined following the protocols outlined in the International Organization for Standardization 26642:2010, involving 10 healthy adults (with an equal proportion of males and females). Both the reference glucose and test food provided 50 g of carbohydrates, and participants’ blood glucose levels were monitored for two hours. After consuming TOP-OP13NPD at 15, 30, 45, and 60 minutes, subjects exhibited significantly lower blood glucose levels than those on the glucose reference diet (p < 0.001). The incremental area under the curve at 120 minutes was also significantly lower compared to the glucose reference diet (1,380.08 ± 276.48 and 3,082.59 ± 677.16 mg × min/dL; p < 0.01). The mean ± SEM GI value of the test food was 48.62 ± 5.86. TOP-OP13NPD is classified as a low glycemic index diet. This result suggests that this formula may be suitable for individuals requiring oligomeric enteral nutrition who need to control their blood glucose levels.","PeriodicalId":9884,"journal":{"name":"Chiang Mai Journal of Science","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141795603","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Suchanat Suttison, Pakinee Thongrit, Suwanan Thammarong, K. Pengpat, U. Intatha, Jinchen Fan, Wei Zhang, S. Eitssayeam
T his study investigates the synthesis of Lithium Iron Phosphate (LFP) with NMC-doped cathode materials, aiming to enhance the performance of lithium-ion batteries. The NMC content was varied from 0.02 to 0.10wt%, and 1wt% of (NH4)3PO4 was added to all conditions to prevent phosphate loss during the calcination process. The composite powder was prepared using a straightforward mixed oxide method, with a calcination temperature of 600 °C for 5 hours under an argon gas flow. X-ray diffraction (XRD) analysis confirmed the successful formation of pure LFP with an orthorhombic crystal structure, devoid of any secondary phases. To further explore the impact of NMC doping on the structural characteristics, FTIR and Raman spectroscopy were employed. Results revealed that increasing NMC doping concentration beyond 0.02wt% led to the broadening of the PO43− symmetric stretching band at approximately 947 cm−1, indicating a higher degree of disorder in the LFP structures. This disorder was found to adversely affect electrochemical performance, resulting in decreased discharge capacity and increased impedance, as determined by electrochemical impedance spectroscopy (EIS), with higher concentrations of NMC and (NH4)3PO4. Scanning Electron Microscopy (SEM) analysis unveiled the presence of agglomerated particles ranging in size from 0.5 to 0.9 microns. Optimal conditions were identified with the addition of NMC doped at 0.02wt%, which exhibited a discharge capacity of approximately 119.41 mAh/g at 0.2 C, along with a low impedance of 200 Ohm. Moreover, the 0.02wt% sample demonstrated a promising linear trend in cycle performance, suggesting its potential for future applications in lithium-ion batteries.
{"title":"Effect of NMC-doping Concentration on the Structural Feature and Electrical Properties of Lithium Iron Phosphate Cathode for Use in Lithium-ion Batteries","authors":"Suchanat Suttison, Pakinee Thongrit, Suwanan Thammarong, K. Pengpat, U. Intatha, Jinchen Fan, Wei Zhang, S. Eitssayeam","doi":"10.12982/cmjs.2024.064","DOIUrl":"https://doi.org/10.12982/cmjs.2024.064","url":null,"abstract":"T his study investigates the synthesis of Lithium Iron Phosphate (LFP) with NMC-doped cathode materials, aiming to enhance the performance of lithium-ion batteries. The NMC content was varied from 0.02 to 0.10wt%, and 1wt% of (NH4)3PO4 was added to all conditions to prevent phosphate loss during the calcination process. The composite powder was prepared using a straightforward mixed oxide method, with a calcination temperature of 600 °C for 5 hours under an argon gas flow. X-ray diffraction (XRD) analysis confirmed the successful formation of pure LFP with an orthorhombic crystal structure, devoid of any secondary phases. To further explore the impact of NMC doping on the structural characteristics, FTIR and Raman spectroscopy were employed. Results revealed that increasing NMC doping concentration beyond 0.02wt% led to the broadening of the PO43− symmetric stretching band at approximately 947 cm−1, indicating a higher degree of disorder in the LFP structures. This disorder was found to adversely affect electrochemical performance, resulting in decreased discharge capacity and increased impedance, as determined by electrochemical impedance spectroscopy (EIS), with higher concentrations of NMC and (NH4)3PO4. Scanning Electron Microscopy (SEM) analysis unveiled the presence of agglomerated particles ranging in size from 0.5 to 0.9 microns. Optimal conditions were identified with the addition of NMC doped at 0.02wt%, which exhibited a discharge capacity of approximately 119.41 mAh/g at 0.2 C, along with a low impedance of 200 Ohm. Moreover, the 0.02wt% sample demonstrated a promising linear trend in cycle performance, suggesting its potential for future applications in lithium-ion batteries.","PeriodicalId":9884,"journal":{"name":"Chiang Mai Journal of Science","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141795356","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
P ickled mustard green (Brassica juncea) is a traditional fermented vegetable product in Thailand, commonly used as a culinary ingredient due to its distinctive flavor. However, community-level pickled mustard production often faces challenges in terms of consistent physical and chemical characteristics. This research aims to improve the quality of pickled mustard greens (PMGs) at the community level. The study investigated the effects of different fermentation processes on the chemical, physical, and volatile organic compound profiles of pickled mustard greens. Five fermentation treatments were compared, varying in starter culture concentration (0% and 2%), salt content (0% and 5%), sugar content (5% and 10%), and vinegar addition (0% and 5%). The results investigated that the treatment with lactic acid bacteria, salt, sugar, and vinegar (at concentrations of 2%, 5%, 5%, and 5% respectively) has a positive correlation with the physical quality of the PMGs. Significant differences in pH, titratable acidity, and salt content were found between inoculated and uninoculated samples. Hydrocarbons were identified as the primary compounds contributing to the flavor across all fermentation methods. These findings offer valuable guidelines for improving pickled mustard production, benefiting communities and private sectors involved in this field.
{"title":"Physiochemical Properties and Volatile Profiles in Thai Pickled Mustard Greens Subjected to Varied Fermentation Conditions","authors":"Bow Tinpovong, Malaiporn Wongkaew, Warawaran Shimbhanao, Aekarin Inpramoon, Nadruedee Leenarach, P. Chaimongkol","doi":"10.12982/cmjs.2024.054","DOIUrl":"https://doi.org/10.12982/cmjs.2024.054","url":null,"abstract":"P ickled mustard green (Brassica juncea) is a traditional fermented vegetable product in Thailand, commonly used as a culinary ingredient due to its distinctive flavor. However, community-level pickled mustard production often faces challenges in terms of consistent physical and chemical characteristics. This research aims to improve the quality of pickled mustard greens (PMGs) at the community level. The study investigated the effects of different fermentation processes on the chemical, physical, and volatile organic compound profiles of pickled mustard greens. Five fermentation treatments were compared, varying in starter culture concentration (0% and 2%), salt content (0% and 5%), sugar content (5% and 10%), and vinegar addition (0% and 5%). The results investigated that the treatment with lactic acid bacteria, salt, sugar, and vinegar (at concentrations of 2%, 5%, 5%, and 5% respectively) has a positive correlation with the physical quality of the PMGs. Significant differences in pH, titratable acidity, and salt content were found between inoculated and uninoculated samples. Hydrocarbons were identified as the primary compounds contributing to the flavor across all fermentation methods. These findings offer valuable guidelines for improving pickled mustard production, benefiting communities and private sectors involved in this field.","PeriodicalId":9884,"journal":{"name":"Chiang Mai Journal of Science","volume":null,"pages":null},"PeriodicalIF":0.6,"publicationDate":"2024-07-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141795521","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"综合性期刊","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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