Pub Date : 2023-12-20DOI: 10.55766/sujst-2023-03-e03092
Azyyati Ridha Alfian, Fea Firdani, Putri Nilam Sari
Refill drinking water has been popular due to its low price and practicality, but the quality is still questionable. Data from the Health Office of Pariaman City stated that based on laboratory tests on the quality of drinking water from the drinking-water refill depots in Pariaman City, it showed that every year more than 50% of drinking water from the drinking-water refill depots do not meet the health requirements for drinking water. This study aimed to investigate the health risks of refill drinking water generated from 78 drinking-water refill depots spread across four sub-districts in Pariaman City. Using the Quantitative Microbial Risk Assessment calculation, the risk calculation used drinking-water refill depots laboratory examination data from the Pariaman City Health Office in 2020. It was found that there was a high risk of infection from E. coli contamination in refill drinking water, where the highest risk was in the North Pariaman District with an annual risk of disease for individuals of 5,14×10-1. This showed the ineffectiveness of drinking-water refill depots in eliminating bacteria and lousy hygiene and sanitation practices. An approach is needed for the owners and operators of drinking water refill depots to improve the tools' effectiveness and education on hygiene and sanitation for drinking-water refill depots operators to maintain patient safety and health.
{"title":"RISK OF DISEASE DUE TO CONTAMINATION OF REFILL DRINKING WATER: USING QUANTITATIVE MICROBIAL RISK ASSESSMENT","authors":"Azyyati Ridha Alfian, Fea Firdani, Putri Nilam Sari","doi":"10.55766/sujst-2023-03-e03092","DOIUrl":"https://doi.org/10.55766/sujst-2023-03-e03092","url":null,"abstract":"Refill drinking water has been popular due to its low price and practicality, but the quality is still questionable. Data from the Health Office of Pariaman City stated that based on laboratory tests on the quality of drinking water from the drinking-water refill depots in Pariaman City, it showed that every year more than 50% of drinking water from the drinking-water refill depots do not meet the health requirements for drinking water. This study aimed to investigate the health risks of refill drinking water generated from 78 drinking-water refill depots spread across four sub-districts in Pariaman City. Using the Quantitative Microbial Risk Assessment calculation, the risk calculation used drinking-water refill depots laboratory examination data from the Pariaman City Health Office in 2020. It was found that there was a high risk of infection from E. coli contamination in refill drinking water, where the highest risk was in the North Pariaman District with an annual risk of disease for individuals of 5,14×10-1. This showed the ineffectiveness of drinking-water refill depots in eliminating bacteria and lousy hygiene and sanitation practices. An approach is needed for the owners and operators of drinking water refill depots to improve the tools' effectiveness and education on hygiene and sanitation for drinking-water refill depots operators to maintain patient safety and health.","PeriodicalId":509211,"journal":{"name":"Suranaree Journal of Science and Technology","volume":"10 8","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139169600","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-27DOI: 10.55766/sujst-2023-05-e02649
Sudawadee Yasaka
This study investigated the presence of six heavy metals (zinc, copper, lead, chromium, nickel, and arsenic) in the water and sediments of four rivers in Phitsanulok province: Nan River, Yom River, Kwainoy River, and Wangthong River. Water and sediment samples were collected from eight stations and analyzed using X-Ray Fluorescence (XRF) and Atomic Absorption Spectroscopy (AAS). The study also examined the concentrations and sources of heavy metals in the sediment of these rivers. The results showed that the average levels of heavy metals in both water and sediment samples followed the order: zinc, chromium, copper, lead, nickel, and arsenic. According to water and sediment quality guidelines, chromium, copper, and nickel posed a significant threat to the water ecosystem in Phitsanulok province. The concentrations of certain heavy metals, including arsenic, lead, and nickel, exceeded normal levels at all of the studied stations, while lead, copper, and chromium concentrations exceeded normal levels at certain stations. The study also found that the concentrations of all six heavy metals in surface water samples did not exceed the drinking water guidelines set by the World Health Organization and national standards.
本研究调查了碧山洛府四条河流（南河、约姆河、夸诺伊河和旺通河）的水和沉积物中存在的六种重金属（锌、铜、铅、铬、镍和砷）。研究人员从八个站点采集了水和沉积物样本，并使用 X 射线荧光 (XRF) 和原子吸收光谱 (AAS) 进行了分析。研究还考察了这些河流沉积物中重金属的浓度和来源。结果显示，水和沉积物样本中重金属的平均含量依次为锌、铬、铜、铅、镍和砷。根据水质和沉积物质量指南，铬、铜和镍对碧山鲁克省的水生态系统构成了严重威胁。在所有研究站点，砷、铅和镍等某些重金属的浓度都超过了正常水平，而某些站点的铅、铜和铬浓度则超过了正常水平。研究还发现，地表水样本中所有六种重金属的浓度均未超过世界卫生组织规定的饮用水准则和国家标准。
{"title":"INVESTIGATION OF HEAVY METAL ACCUMULATION IN WATER AND SEDIMENTS FROM PHITSANULOK PROVINCE USING X-RAY FLUORESCENCE AND ATOMIC ABSORPTION TECHNIQUES","authors":"Sudawadee Yasaka","doi":"10.55766/sujst-2023-05-e02649","DOIUrl":"https://doi.org/10.55766/sujst-2023-05-e02649","url":null,"abstract":"This study investigated the presence of six heavy metals (zinc, copper, lead, chromium, nickel, and arsenic) in the water and sediments of four rivers in Phitsanulok province: Nan River, Yom River, Kwainoy River, and Wangthong River. Water and sediment samples were collected from eight stations and analyzed using X-Ray Fluorescence (XRF) and Atomic Absorption Spectroscopy (AAS). The study also examined the concentrations and sources of heavy metals in the sediment of these rivers. The results showed that the average levels of heavy metals in both water and sediment samples followed the order: zinc, chromium, copper, lead, nickel, and arsenic. According to water and sediment quality guidelines, chromium, copper, and nickel posed a significant threat to the water ecosystem in Phitsanulok province. The concentrations of certain heavy metals, including arsenic, lead, and nickel, exceeded normal levels at all of the studied stations, while lead, copper, and chromium concentrations exceeded normal levels at certain stations. The study also found that the concentrations of all six heavy metals in surface water samples did not exceed the drinking water guidelines set by the World Health Organization and national standards.","PeriodicalId":509211,"journal":{"name":"Suranaree Journal of Science and Technology","volume":"73 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139231846","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-24DOI: 10.55766/sujst-2023-05-e0154
Devanampriyan Rajan, Sangeetha Arunalchalam, Deepak Subramani, Harini Alagumurugan, Abbas Ganesan
Green food is a term related to plant-based food having properties similar to meat. The rising environmental and health concerns are the main driving forces of consumer preference for sustainable plant-based meat over animal meat around the world. Proteins needed for meat analogue development can be of plant, algae, fungi or bacterial origin. The ingredients like hydrocolloids, smoke flavourings and spices can be added to improve texture and flavour profile of products. Though commercial meat analogues of isotropic nature are manufactured by conventional extrusion technique, advanced technologies like shear cell and electrospinning can make fibrous yet tender anisotropic products that resemble very close to animal meat. The rising consumer demand for meat analogues allows a great market opportunity for manufacturers to sell products with various positioning claims like plant-based, vegetarian, high in protein, environment friendly etc. This review elaborates on ingredients and technologies used for the development of meat analogues. Also, the market potential and the feasible solutions for challenges and constraints faced by industries are discussed
{"title":"GREEN FOODS AS SUSTAINABLE MEAT ALTERNATIVE: A REVIEW","authors":"Devanampriyan Rajan, Sangeetha Arunalchalam, Deepak Subramani, Harini Alagumurugan, Abbas Ganesan","doi":"10.55766/sujst-2023-05-e0154","DOIUrl":"https://doi.org/10.55766/sujst-2023-05-e0154","url":null,"abstract":"Green food is a term related to plant-based food having properties similar to meat. The rising environmental and health concerns are the main driving forces of consumer preference for sustainable plant-based meat over animal meat around the world. Proteins needed for meat analogue development can be of plant, algae, fungi or bacterial origin. The ingredients like hydrocolloids, smoke flavourings and spices can be added to improve texture and flavour profile of products. Though commercial meat analogues of isotropic nature are manufactured by conventional extrusion technique, advanced technologies like shear cell and electrospinning can make fibrous yet tender anisotropic products that resemble very close to animal meat. The rising consumer demand for meat analogues allows a great market opportunity for manufacturers to sell products with various positioning claims like plant-based, vegetarian, high in protein, environment friendly etc. This review elaborates on ingredients and technologies used for the development of meat analogues. Also, the market potential and the feasible solutions for challenges and constraints faced by industries are discussed","PeriodicalId":509211,"journal":{"name":"Suranaree Journal of Science and Technology","volume":"15 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139238815","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Blockchain technology now relies heavily on smart contracts, which offer self-executing code for the exchange of goods and data. Smart contracts enable financial activities like payments and auctions on blockchain systems. Even if bugs are found, they cannot be changed. They are frequently used to automate the implementation of agreements so that all parties may be confident in the conclusion without the need for an intermediary. But because of their openness and how they interact with one another in the blockchain ecosystem, these contracts are vulnerable to security risks. Smart contract security research has advanced significantly in recent years. The research community of smart contract security has made a significant improvement recently. Researchers have identified several security flaws in smart contracts and have created frameworks for verification and static analysis to find them. This study attempts to identify the most critical software security issues that affect smart contracts. These are then handled utilizing a variety of methods and equipment common to the sector
{"title":"THREAT PREVENTION & VULNERABILITY ANALYSIS OF SMART CONTRACTS IN BLOCKCHAIN NETWORKS","authors":"Pankaj Chandra, Santosh Soni, Akanksha Gupta, Prayas Kumar, Kunal Raj","doi":"10.55766/sujst-2023-05-e01234","DOIUrl":"https://doi.org/10.55766/sujst-2023-05-e01234","url":null,"abstract":"Blockchain technology now relies heavily on smart contracts, which offer self-executing code for the exchange of goods and data. Smart contracts enable financial activities like payments and auctions on blockchain systems. Even if bugs are found, they cannot be changed. They are frequently used to automate the implementation of agreements so that all parties may be confident in the conclusion without the need for an intermediary. But because of their openness and how they interact with one another in the blockchain ecosystem, these contracts are vulnerable to security risks. Smart contract security research has advanced significantly in recent years. The research community of smart contract security has made a significant improvement recently. Researchers have identified several security flaws in smart contracts and have created frameworks for verification and static analysis to find them. This study attempts to identify the most critical software security issues that affect smart contracts. These are then handled utilizing a variety of methods and equipment common to the sector","PeriodicalId":509211,"journal":{"name":"Suranaree Journal of Science and Technology","volume":"135 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139242110","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Cilacap breadfruit is a variety native to Indonesia, characterized by superior properties, including fast growth, large fruit size, high carbohydrate, and starch content. This plant has a relatively high content of amylose and resistant starch (RS), allowing its conversion into RS for health benefits. Therefore, this study aimed to investigate the effect of autoclaving temperature (100, 121, and 140℃), cooling at 4ºC, and storing time (24 and 48 hours) on the formation of RS from Cilacap breadfruit, and determine its physicochemical (amylose, amylopectin, resistant starch, pasting properties, and thermal properties), as well as functional properties. The results showed that autoclaving-cooling increased the amylose and RS content, water solubility, onset, and peak of thermal temperature. The pasting properties of all parameters, gelatinization enthalpy, swelling power, and amylopectin content were decreased. Amylose content also significantly increased (p≤0.05) from 31.01±0.24 to 37.91±0.43, and RS content (p≤0.05) from 10.98±0.07 to 19.41±0.05. Furthermore, native starch and Cilacap breadfruit RS3 were categorized as high in Amylose. The autoclaving cooling process on Cilacap breadfruit starch effectively increased RS levels, making it a viable alternative for developing functional food
{"title":"PHYSICOCHEMICAL AND FUNCTIONAL PROPERTIES OF RS3 OBTAINED FROM CILACAP BREADFRUIT (Artocarpus altilis (Parkinson) Fosberg) STARCH","authors":"Nunuk Siti Rahayu, Samanhudi Samanhudi, Danar Praseptiangga, Bambang Haryanto","doi":"10.55766/sujst-2023-05-e0895","DOIUrl":"https://doi.org/10.55766/sujst-2023-05-e0895","url":null,"abstract":"Cilacap breadfruit is a variety native to Indonesia, characterized by superior properties, including fast growth, large fruit size, high carbohydrate, and starch content. This plant has a relatively high content of amylose and resistant starch (RS), allowing its conversion into RS for health benefits. Therefore, this study aimed to investigate the effect of autoclaving temperature (100, 121, and 140℃), cooling at 4ºC, and storing time (24 and 48 hours) on the formation of RS from Cilacap breadfruit, and determine its physicochemical (amylose, amylopectin, resistant starch, pasting properties, and thermal properties), as well as functional properties. The results showed that autoclaving-cooling increased the amylose and RS content, water solubility, onset, and peak of thermal temperature. The pasting properties of all parameters, gelatinization enthalpy, swelling power, and amylopectin content were decreased. Amylose content also significantly increased (p≤0.05) from 31.01±0.24 to 37.91±0.43, and RS content (p≤0.05) from 10.98±0.07 to 19.41±0.05. Furthermore, native starch and Cilacap breadfruit RS3 were categorized as high in Amylose. The autoclaving cooling process on Cilacap breadfruit starch effectively increased RS levels, making it a viable alternative for developing functional food","PeriodicalId":509211,"journal":{"name":"Suranaree Journal of Science and Technology","volume":"50 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139248303","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-22DOI: 10.55766/sujst-2023-05-e02630
P. Wanakamol, Auekan Boonchot, Chutimol Pongsiri, Pimtawan Sangjantip, Supitcha Supansomboon, A. Promboon
Fibroin, derived from cocoon, is a natural polymer used widely and increasingly in various fields. In recent years, the development of fluorescent fibroin has gained attention in the field of tissue engineering, because of its biocompatibility, oxygen and water vapor permeability, biodegradability, and ability to be tested non-invasively. In this work, silk fibroin and fluorescent silk fibroin fibers were fabricated via electrospinning, a simple process through which continuous submicron fibers can be produced. Degummed silk was extracted by dissolving in calcium chloride solution. The fibroin powder was dissolved in formic acid to form 10, 12, and 14 wt.% solutions. Fluorescent fibroin solutions were achieved with addition of fluoresceine sodium (FS) as fluorescent dye. The fluorescent solutions were prepared at 10 wt.% fibroin with varying FS concentration at 0.1, 0.3, and 0.5 wt.%, and at 0.5 wt.% FS with varying fibroin concentration at 10, 12, and 14 wt.%. The fibroin solutions were fabricated into fibers via electrospinning using an applied voltage of 20 kV. The surface morphology of silk fibroin fibers and fluorescent fibroin fibers, observed by scanning electron microscope (SEM), showed long continuous fibers. The average fiber diameter, in sub-micron range, was found to increase with fibroin concentration. The fluorescence intensity observed by fluorescence spectrophotometer was found to increase with decreasing fluorescent dye concentration. The functional groups and chemical structure of silk fibroin fibers analyzed by infrared spectroscopy (IR) were not affected by the addition of the fluorescent dye.
{"title":"FABRICATION OF SILK FIBROIN AND FLUORESCENT SILK FIBROIN FIBERS VIA ELECTROSPINNING","authors":"P. Wanakamol, Auekan Boonchot, Chutimol Pongsiri, Pimtawan Sangjantip, Supitcha Supansomboon, A. Promboon","doi":"10.55766/sujst-2023-05-e02630","DOIUrl":"https://doi.org/10.55766/sujst-2023-05-e02630","url":null,"abstract":"Fibroin, derived from cocoon, is a natural polymer used widely and increasingly in various fields. In recent years, the development of fluorescent fibroin has gained attention in the field of tissue engineering, because of its biocompatibility, oxygen and water vapor permeability, biodegradability, and ability to be tested non-invasively. In this work, silk fibroin and fluorescent silk fibroin fibers were fabricated via electrospinning, a simple process through which continuous submicron fibers can be produced. Degummed silk was extracted by dissolving in calcium chloride solution. The fibroin powder was dissolved in formic acid to form 10, 12, and 14 wt.% solutions. Fluorescent fibroin solutions were achieved with addition of fluoresceine sodium (FS) as fluorescent dye. The fluorescent solutions were prepared at 10 wt.% fibroin with varying FS concentration at 0.1, 0.3, and 0.5 wt.%, and at 0.5 wt.% FS with varying fibroin concentration at 10, 12, and 14 wt.%. The fibroin solutions were fabricated into fibers via electrospinning using an applied voltage of 20 kV. The surface morphology of silk fibroin fibers and fluorescent fibroin fibers, observed by scanning electron microscope (SEM), showed long continuous fibers. The average fiber diameter, in sub-micron range, was found to increase with fibroin concentration. The fluorescence intensity observed by fluorescence spectrophotometer was found to increase with decreasing fluorescent dye concentration. The functional groups and chemical structure of silk fibroin fibers analyzed by infrared spectroscopy (IR) were not affected by the addition of the fluorescent dye.","PeriodicalId":509211,"journal":{"name":"Suranaree Journal of Science and Technology","volume":"253 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139249898","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Rapidly escalating plastic consumption has led to a significant surge in plastic waste, causing notable repercussions for environmental well-being due to the non-biodegradable nature of plastics. In order to mitigate the environmental impact of plastic, it is imperative to explore alternative approaches to recycling plastic. In the present day, several industries repurpose plastic waste to create a wide array of products, including domestic items, clothing, household materials, textiles, construction elements, and even convert waste plastic into fuel. Among these options, the utilization of plastic waste in the creation of building materials has garnered significant focus. This practice not only reduces the amount of plastic waste discarded as litter or sent to landfills but also diminishes the necessity for mining raw materials used in construction. This, in turn, contributes to mitigating the adverse environmental impacts associated with the construction industry. Within this endeavor, the initiative involves partially substituting plastic waste for the fine aggregate in both concrete blocks and stabilized mud blocks. A comparative analysis is conducted between the compressive strength of these integrated plastic blocks and conventional standard blocks. The outcomes unequivocally demonstrate the viability of recycling plastic waste in a constructive manner, achieved through the incorporation of waste plastics in the production of building blocks. Notably, incorporating plastic waste by approximately 3%-6% to replace fine aggregates in Fly-Ash blocks results in enhanced strength compared to regular Fly-Ash blocks
{"title":"PRODUCTION OF PLASTIC INCORPORATED CONCRETE AND STABILIZED MUD BLOCK","authors":"Vinaya Shyam D, Nikhil J Shetty, Deekshith Kumar, Sathisha Gowda, Pruthviraj Singh B.K","doi":"10.55766/sujst-2023-05-e0434","DOIUrl":"https://doi.org/10.55766/sujst-2023-05-e0434","url":null,"abstract":"Rapidly escalating plastic consumption has led to a significant surge in plastic waste, causing notable repercussions for environmental well-being due to the non-biodegradable nature of plastics. In order to mitigate the environmental impact of plastic, it is imperative to explore alternative approaches to recycling plastic. In the present day, several industries repurpose plastic waste to create a wide array of products, including domestic items, clothing, household materials, textiles, construction elements, and even convert waste plastic into fuel. Among these options, the utilization of plastic waste in the creation of building materials has garnered significant focus. This practice not only reduces the amount of plastic waste discarded as litter or sent to landfills but also diminishes the necessity for mining raw materials used in construction. This, in turn, contributes to mitigating the adverse environmental impacts associated with the construction industry. Within this endeavor, the initiative involves partially substituting plastic waste for the fine aggregate in both concrete blocks and stabilized mud blocks. A comparative analysis is conducted between the compressive strength of these integrated plastic blocks and conventional standard blocks. The outcomes unequivocally demonstrate the viability of recycling plastic waste in a constructive manner, achieved through the incorporation of waste plastics in the production of building blocks. Notably, incorporating plastic waste by approximately 3%-6% to replace fine aggregates in Fly-Ash blocks results in enhanced strength compared to regular Fly-Ash blocks","PeriodicalId":509211,"journal":{"name":"Suranaree Journal of Science and Technology","volume":"26 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139253541","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-21DOI: 10.55766/sujst-2023-05-e02782
P. Kumnorkaew, Supawinee Chaosukho, Sorrawit Meeklinhom, Sasiphapa Rodbuntum, Nuttaya Sukgorn, A. Kaewprajak, P. Sreearunothai
Perovskite solar cells (PSCs) technology has emerged as a highly promising photovoltaic (PV) option due to remarkable advancements in power conversion efficiency (PCE). Nevertheless, the stability of PSCs continues to pose a challenge for commercialization, as factors such as moisture, oxygen, light, and temperature can lead to degradation during fabrication and actual use stage. The stability of the perovskite film is crucial for extending the device’s lifetime and performance. This research seeks to explore the degradation mechanism and improve the perovskite film’s stability by incorporating 1-butyl-3-methylimidazolium tetrafluoroborate (BMIMBF4) and 1,3-dimethyl-3-imidazolium hexafluorophosphate (DMIMPF6) ionic liquids into a perovskite precursor using the two-step deposition technique in ambient air. The perovskite film’s degradation and PSCs’ stability were evaluated under high relative humidity conditions, averaging 73%RH without encapsulation. UV-visible spectroscopy results indicate that the most stable perovskite film, containing the BMIMBF4 ionic liquid additive, maintains its α phase perovskite structure for 144 hours without alterations in absorbance and persisted for over 336 hours before degrading into an undesirable δ phase perovskite. Furthermore, PSCs retained 74.1% of their initial PCE after 28 days of exposure to ambient conditions. This research offers promising findings for the large-scale fabrication of stable PSCs.
{"title":"HIGHLY STABLE PEROVSKITE FILM WITH IONIC LIQUID ADDITIVES FOR AMBIENT AIR DEPOSITION","authors":"P. Kumnorkaew, Supawinee Chaosukho, Sorrawit Meeklinhom, Sasiphapa Rodbuntum, Nuttaya Sukgorn, A. Kaewprajak, P. Sreearunothai","doi":"10.55766/sujst-2023-05-e02782","DOIUrl":"https://doi.org/10.55766/sujst-2023-05-e02782","url":null,"abstract":"Perovskite solar cells (PSCs) technology has emerged as a highly promising photovoltaic (PV) option due to remarkable advancements in power conversion efficiency (PCE). Nevertheless, the stability of PSCs continues to pose a challenge for commercialization, as factors such as moisture, oxygen, light, and temperature can lead to degradation during fabrication and actual use stage. The stability of the perovskite film is crucial for extending the device’s lifetime and performance. This research seeks to explore the degradation mechanism and improve the perovskite film’s stability by incorporating 1-butyl-3-methylimidazolium tetrafluoroborate (BMIMBF4) and 1,3-dimethyl-3-imidazolium hexafluorophosphate (DMIMPF6) ionic liquids into a perovskite precursor using the two-step deposition technique in ambient air. The perovskite film’s degradation and PSCs’ stability were evaluated under high relative humidity conditions, averaging 73%RH without encapsulation. UV-visible spectroscopy results indicate that the most stable perovskite film, containing the BMIMBF4 ionic liquid additive, maintains its α phase perovskite structure for 144 hours without alterations in absorbance and persisted for over 336 hours before degrading into an undesirable δ phase perovskite. Furthermore, PSCs retained 74.1% of their initial PCE after 28 days of exposure to ambient conditions. This research offers promising findings for the large-scale fabrication of stable PSCs.","PeriodicalId":509211,"journal":{"name":"Suranaree Journal of Science and Technology","volume":"35 15","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139252609","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-21DOI: 10.55766/sujst-2023-05-e02783
N. Luewarasirikul, J. Rajagukguk, J. Kaewkhao
Barium sodium borate glasses doped with Dy2O3 were fabricated in this work with the variation of barium oxide concentration. The excitation spectra, with 575 nm emission, show the highest excitation band at 349 nm. The emission spectra, with 349 nm excitation, show the emission bands at 482 and 575 nm. The highest emission light yield has occurred when the glass sample has 10 mol% of BaO. The (x,y) color coordinates of the emitted light from all the glass samples were (0.37,0.41) that point at the white light region in the CIE 1931 color space. The Y/B ratio indicates a high asymmetric environment around Dy3+ ions. The luminescence lifetimes are found to be 0.455 for all the glass samples.
{"title":"THE EFFECT OF BARIUM CONTENT ON THE LUMINESCENCE PROPERTY OF DYSPROSIUM-DOPED BORATE GLASSES","authors":"N. Luewarasirikul, J. Rajagukguk, J. Kaewkhao","doi":"10.55766/sujst-2023-05-e02783","DOIUrl":"https://doi.org/10.55766/sujst-2023-05-e02783","url":null,"abstract":"Barium sodium borate glasses doped with Dy2O3 were fabricated in this work with the variation of barium oxide concentration. The excitation spectra, with 575 nm emission, show the highest excitation band at 349 nm. The emission spectra, with 349 nm excitation, show the emission bands at 482 and 575 nm. The highest emission light yield has occurred when the glass sample has 10 mol% of BaO. The (x,y) color coordinates of the emitted light from all the glass samples were (0.37,0.41) that point at the white light region in the CIE 1931 color space. The Y/B ratio indicates a high asymmetric environment around Dy3+ ions. The luminescence lifetimes are found to be 0.455 for all the glass samples.","PeriodicalId":509211,"journal":{"name":"Suranaree Journal of Science and Technology","volume":"95 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139254477","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2023-11-21DOI: 10.55766/sujst-2023-05-e02792
Kantawich Suphunsaeng, Boonsong Thanyakit, Thwe Thwe Win, L. Prasittisopin
Currently, a conventional plaster is widely used for wall plastering and occurs in various operational steps. The hardening time necessary for the plasters plays one of the most important roles in determining the duration of plastering work. Rapid-setting plasterers can assist in accelerating the process. However, plastering mortar with a hardened consistency is an imported product with very high shipping costs and import obligations, making it less competitive compared to local products in ASEAN. To maintain the quality and shelf life, transporting it also requires considerable time. Consequently, plaster products may agglomerate and lose their distinctive qualities. Besides, the climate in the ASEAN region differs from the country in which rapid-setting plaster products are produced. This has a direct effect on the plastering processes employed by ASEAN plasterers. This study focuses on the production of plaster mixes using raw materials in Thailand. To accelerate solidification, the addition of 3-4% calcium aluminate cement was conducted. In addition, it is compatible with Thai standards. The experimental results demonstrated that the manufactured plaster satisfied Thailand’s quality and usability standards. Consideration is given to material performance parameters such as flowability, setting time, compressive strength, constructability of user field study, and carbon footprint regarding the life cycle assessment.
{"title":"DEVELOPMENT OF RAPID SET PLASTERING MORTAR FOR USING IN THE ASEAN REGION","authors":"Kantawich Suphunsaeng, Boonsong Thanyakit, Thwe Thwe Win, L. Prasittisopin","doi":"10.55766/sujst-2023-05-e02792","DOIUrl":"https://doi.org/10.55766/sujst-2023-05-e02792","url":null,"abstract":"Currently, a conventional plaster is widely used for wall plastering and occurs in various operational steps. The hardening time necessary for the plasters plays one of the most important roles in determining the duration of plastering work. Rapid-setting plasterers can assist in accelerating the process. However, plastering mortar with a hardened consistency is an imported product with very high shipping costs and import obligations, making it less competitive compared to local products in ASEAN. To maintain the quality and shelf life, transporting it also requires considerable time. Consequently, plaster products may agglomerate and lose their distinctive qualities. Besides, the climate in the ASEAN region differs from the country in which rapid-setting plaster products are produced. This has a direct effect on the plastering processes employed by ASEAN plasterers. This study focuses on the production of plaster mixes using raw materials in Thailand. To accelerate solidification, the addition of 3-4% calcium aluminate cement was conducted. In addition, it is compatible with Thai standards. The experimental results demonstrated that the manufactured plaster satisfied Thailand’s quality and usability standards. Consideration is given to material performance parameters such as flowability, setting time, compressive strength, constructability of user field study, and carbon footprint regarding the life cycle assessment.","PeriodicalId":509211,"journal":{"name":"Suranaree Journal of Science and Technology","volume":"20 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139254003","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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