Lalaina Patricia Rasoamanana, Andriambelo Radonirina Razafimahatratra, T. Ramananantoandro
Near InfraRed Spectroscopy (NIRS) has emerged as a promising non-destructive method for wood analysis. In this study, the efficacy of NIRS in predicting the wood specific gravity (WSG) of Ravenala madagascariensis, an endemic non-woody species of Madagascar was assessed. The optimal model, employing "SNV (standard normal variate) + DT (detrending)" pre-treatment and utilizing 11 latent variables, exhibited interesting performance metrics, including an RMSEcv of 0.013 g.cm-3, R²cv of 0.73, and RPDcv of 2.76. Additionally, in independent validation, the model achieved an R² of 0.70 and an RPD of 2.17, with 11 numbers of latent variables. The predictive model's application unveiled significant radial variability in WSG within Ravenala madagascariensis. Specifically, the central zone exhibited lower density (average of 0.082 g.cm-³) than the peripheral zone (0.12 g.cm-³), with a highly significant difference (>0.1% threshold). Furthermore, there was a significant interaction effect between radial portion and compartment on WSG, exceeding a threshold of 1%. However, no such significant effects were observed for radial portion×sites interaction at the 5% significance level. This study contributes valuable insights into the wood properties of this endemic species, enhancing the understanding of its ecological and physical significance.
{"title":"Estimating Wood Specific Gravity of Ravenala madagascariensis Sonn. Using Near-Infrared Spectroscopy","authors":"Lalaina Patricia Rasoamanana, Andriambelo Radonirina Razafimahatratra, T. Ramananantoandro","doi":"10.4028/p-rorn3t","DOIUrl":"https://doi.org/10.4028/p-rorn3t","url":null,"abstract":"Near InfraRed Spectroscopy (NIRS) has emerged as a promising non-destructive method for wood analysis. In this study, the efficacy of NIRS in predicting the wood specific gravity (WSG) of Ravenala madagascariensis, an endemic non-woody species of Madagascar was assessed. The optimal model, employing \"SNV (standard normal variate) + DT (detrending)\" pre-treatment and utilizing 11 latent variables, exhibited interesting performance metrics, including an RMSEcv of 0.013 g.cm-3, R²cv of 0.73, and RPDcv of 2.76. Additionally, in independent validation, the model achieved an R² of 0.70 and an RPD of 2.17, with 11 numbers of latent variables. The predictive model's application unveiled significant radial variability in WSG within Ravenala madagascariensis. Specifically, the central zone exhibited lower density (average of 0.082 g.cm-³) than the peripheral zone (0.12 g.cm-³), with a highly significant difference (>0.1% threshold). Furthermore, there was a significant interaction effect between radial portion and compartment on WSG, exceeding a threshold of 1%. However, no such significant effects were observed for radial portion×sites interaction at the 5% significance level. This study contributes valuable insights into the wood properties of this endemic species, enhancing the understanding of its ecological and physical significance.","PeriodicalId":17714,"journal":{"name":"Key Engineering Materials","volume":" 14","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140686707","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}
Acid-based geopolymers (ABG) have gained attention as eco-friendly alternatives to Ordinary Portland cement. This study synthesized ABG by activating fly ash with commercial H3PO4 and an alternative P leachate from sewage sludge. The ABG was synthesized at different molar concentrations of 4M, 6M, 8M, 10M, and 12M, while P-leachate geopolymer (PFA) was synthesized with liquid/solid ratios of 0.2-0.5. The unconfined compressive strength (UCS) was used to measure the geopolymer performance, which was also studied using scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR). The P concentration was higher than the alternative P source; however, the Al concentration was low, resulting in a lower UCS compared to ABG FA. ABG FA activated with 8M reported a UCS of 11.53 MPa. The strength of ABG FA was attributed to the Si-O-P-O-Si, (PO4)5-, (AlO4)5, and Al-O-Si networks and the participation of H2PO4-in geopolymerization. The PFA exhibited the formation of a Si-O-Al-O-P unit and a P-O vibration band, and the microstructure was composed of cenospheres covered with some minor gelatinous particles.
酸性土工聚合物（ABG）作为普通硅酸盐水泥的生态友好型替代品已受到关注。本研究利用商品 H3PO4 和污水污泥中的替代性 P 浸出液活化粉煤灰，合成了 ABG。合成 ABG 的摩尔浓度分别为 4M、6M、8M、10M 和 12M，而 P 浸出液土工聚合物（PFA）的液固比为 0.2-0.5。无压抗压强度（UCS）用于测量土工聚合物的性能，扫描电子显微镜（SEM）和傅立叶变换红外光谱（FTIR）也对其进行了研究。P 浓度高于替代 P 源，但 Al 浓度较低，导致 UCS 低于 ABG FA。用 8M 活化的 ABG FA 的 UCS 为 11.53 兆帕。ABG FA 的强度归因于 Si-O-P-O-Si、(PO4)5-、(AlO4)5 和 Al-O-Si 网络以及 H2PO4 参与了土工聚合。PFA 显示出 Si-O-Al-O-P 单元和 P-O 振带的形成，其微观结构由覆盖着一些微小胶状颗粒的仙人球组成。
{"title":"Synthesis of Acid-Based Fly Ash Geopolymer with Pure Phosphoric Acid Compare with P-Leachate Activator","authors":"Euricia Mkhonto, T. Mashifana, N. Sithole","doi":"10.4028/p-zxkyg9","DOIUrl":"https://doi.org/10.4028/p-zxkyg9","url":null,"abstract":"Acid-based geopolymers (ABG) have gained attention as eco-friendly alternatives to Ordinary Portland cement. This study synthesized ABG by activating fly ash with commercial H3PO4 and an alternative P leachate from sewage sludge. The ABG was synthesized at different molar concentrations of 4M, 6M, 8M, 10M, and 12M, while P-leachate geopolymer (PFA) was synthesized with liquid/solid ratios of 0.2-0.5. The unconfined compressive strength (UCS) was used to measure the geopolymer performance, which was also studied using scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR). The P concentration was higher than the alternative P source; however, the Al concentration was low, resulting in a lower UCS compared to ABG FA. ABG FA activated with 8M reported a UCS of 11.53 MPa. The strength of ABG FA was attributed to the Si-O-P-O-Si, (PO4)5-, (AlO4)5, and Al-O-Si networks and the participation of H2PO4-in geopolymerization. The PFA exhibited the formation of a Si-O-Al-O-P unit and a P-O vibration band, and the microstructure was composed of cenospheres covered with some minor gelatinous particles.","PeriodicalId":17714,"journal":{"name":"Key Engineering Materials","volume":" 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140688848","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}
Amogh A. Sambare, Ramkisan S. Pawar, Mahendra D. Shirsat
The structural and electrical adsorption performance of carbon monoxide (CO), nitrous oxide (NO), nitrous dioxide (NO2), and sulphur dioxide (SO2) are explored using density functional theory calculations on Ni-doped atoms in the crystal structure of bismuth ferrite oxide (BFO). DFT+U+V offers a more complete description than either DFT or DFT+U alone. Good agreement with the experiments is obtained for both the band gap and the crystal field splitting. Ni-doped BFO (010) has adsorption energies of -0.35443 Ry for CO, -0.056076 Ry for NO, -5.64867 Ry for NO2, and -55.5483 Ry for SO2. Also, it was found that the energy of the band gap in pure BFO (010) can be lowered by adding Ni atoms. Further evidence from the DOS plot that Ni-doped BFO (010) may be considered as an emerging doped perovskite in high temperature gas sensing system for SO2 detection.
{"title":"DFT + U +V Investigation on Adsorption of Gas Molecules (CO, SO2, NO, and NO2) on Ni Doped Bismuth Ferrite Oxide (010)","authors":"Amogh A. Sambare, Ramkisan S. Pawar, Mahendra D. Shirsat","doi":"10.4028/p-90hgo8","DOIUrl":"https://doi.org/10.4028/p-90hgo8","url":null,"abstract":"The structural and electrical adsorption performance of carbon monoxide (CO), nitrous oxide (NO), nitrous dioxide (NO2), and sulphur dioxide (SO2) are explored using density functional theory calculations on Ni-doped atoms in the crystal structure of bismuth ferrite oxide (BFO). DFT+U+V offers a more complete description than either DFT or DFT+U alone. Good agreement with the experiments is obtained for both the band gap and the crystal field splitting. Ni-doped BFO (010) has adsorption energies of -0.35443 Ry for CO, -0.056076 Ry for NO, -5.64867 Ry for NO2, and -55.5483 Ry for SO2. Also, it was found that the energy of the band gap in pure BFO (010) can be lowered by adding Ni atoms. Further evidence from the DOS plot that Ni-doped BFO (010) may be considered as an emerging doped perovskite in high temperature gas sensing system for SO2 detection.","PeriodicalId":17714,"journal":{"name":"Key Engineering Materials","volume":" 29","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140688026","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}
Tristan Roy L. Panaligan, Andrea Kate S. Lee, Chelsea J. Petareal, Jhon Rex Tadena
The research centered on creating magnetic water hyacinth biochar (MWHB) by chemically co-precipitating Fe2+ and Fe3+ ions onto the initial biomass, which was pyrolyzed at 450°C for an hour. This MWHB was then utilized in a series of batch adsorption experiments to evaluate its effectiveness in removing nitrates from simulated wastewater. The investigation focused on understanding the impact of pH, amount of adsorbent used, and duration of contact on nitrate removal efficiency. These parameters were selected using a 2k+1 Full Factorial Design of Experiments (DOE). The data collected from the experiments underwent analysis in JMP® (SAS institute) using Pearson’s Correlation test, providing a comprehensive statistical analysis beyond utilizing the software's Prediction Profiler. The findings revealed that the quantity of adsorbent used significantly affected the nitrate removal efficiency of the magnetic biochar, demonstrating a correlation coefficient (r) of 0.8459. On the other hand, pH and contact time exhibited relatively weaker effects, obtaining correlation coefficients of-0.1943 and 0.2915, respectively. The DOE suggested the optimal conditions for nitrate removal to be at pH 3, utilizing 0.40 grams of adsorbent, and maintaining a contact time of 90 minutes, with a predicted nitrate removal efficiency of approximately 99.10%, while the actual removal efficiency stood at 97.31%. Additionally, Scanning Electron Microscopy (SEM) analysis was employed to examine the surface morphology of the MWHB before and after nitrate removal, aiding in understanding the factors contributing to the observed nitrate removal efficiency.
{"title":"Synthesis, Characterization, and Utilization of Water Hyacinth (Eichhornia crassipes) Magnetic Biochar for Nitrate Removal from Simulated Wastewater","authors":"Tristan Roy L. Panaligan, Andrea Kate S. Lee, Chelsea J. Petareal, Jhon Rex Tadena","doi":"10.4028/p-mqqs5n","DOIUrl":"https://doi.org/10.4028/p-mqqs5n","url":null,"abstract":"The research centered on creating magnetic water hyacinth biochar (MWHB) by chemically co-precipitating Fe2+ and Fe3+ ions onto the initial biomass, which was pyrolyzed at 450°C for an hour. This MWHB was then utilized in a series of batch adsorption experiments to evaluate its effectiveness in removing nitrates from simulated wastewater. The investigation focused on understanding the impact of pH, amount of adsorbent used, and duration of contact on nitrate removal efficiency. These parameters were selected using a 2k+1 Full Factorial Design of Experiments (DOE). The data collected from the experiments underwent analysis in JMP® (SAS institute) using Pearson’s Correlation test, providing a comprehensive statistical analysis beyond utilizing the software's Prediction Profiler. The findings revealed that the quantity of adsorbent used significantly affected the nitrate removal efficiency of the magnetic biochar, demonstrating a correlation coefficient (r) of 0.8459. On the other hand, pH and contact time exhibited relatively weaker effects, obtaining correlation coefficients of-0.1943 and 0.2915, respectively. The DOE suggested the optimal conditions for nitrate removal to be at pH 3, utilizing 0.40 grams of adsorbent, and maintaining a contact time of 90 minutes, with a predicted nitrate removal efficiency of approximately 99.10%, while the actual removal efficiency stood at 97.31%. Additionally, Scanning Electron Microscopy (SEM) analysis was employed to examine the surface morphology of the MWHB before and after nitrate removal, aiding in understanding the factors contributing to the observed nitrate removal efficiency.","PeriodicalId":17714,"journal":{"name":"Key Engineering Materials","volume":" 10","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140686321","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}
Several techniques based on ultrasound have been proposed for non-destructive evaluation (NDE). It has been widely applied in many fields such as medicine, mechanical, and construction, especially for the detection of cracks and flaws in structures and for the identification of material properties, which is capable of performing tasks to provide quick measurements while guaranteeing great accuracy. In this paper, we have developed the technique of ultrasonic transmission by water immersion as an alternative technique to study the propagation of ultrasonic waves in two structural materials: wood and wood protected by liquid paint (cement). Overall, the application of the transmission technique by change of the angle of incidence enables the demonstration of the experimental dispersion curves for the ultrasonic modes within the plates and allows the investigation and characterization of the function of the paint system (cement) in the wood plate.
{"title":"Signal Processing Technique to Study the Propagation Modes of Ultrasonic Waves in Wood Protected by Layers of Liquid Paint (Cement)","authors":"M. Tafkirte, A. Hamine","doi":"10.4028/p-d4xwj4","DOIUrl":"https://doi.org/10.4028/p-d4xwj4","url":null,"abstract":"Several techniques based on ultrasound have been proposed for non-destructive evaluation (NDE). It has been widely applied in many fields such as medicine, mechanical, and construction, especially for the detection of cracks and flaws in structures and for the identification of material properties, which is capable of performing tasks to provide quick measurements while guaranteeing great accuracy. In this paper, we have developed the technique of ultrasonic transmission by water immersion as an alternative technique to study the propagation of ultrasonic waves in two structural materials: wood and wood protected by liquid paint (cement). Overall, the application of the transmission technique by change of the angle of incidence enables the demonstration of the experimental dispersion curves for the ultrasonic modes within the plates and allows the investigation and characterization of the function of the paint system (cement) in the wood plate.","PeriodicalId":17714,"journal":{"name":"Key Engineering Materials","volume":" 5","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140686714","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}
This research aimed to examine the impact of foundry sand on alkali leaching and the formation of efflorescence in alkali-activated slag. The activation process involved the utilization of sodium hydroxide and sodium silicate solutions in activating ground-granulated blast furnace slag (GBFS) and sand samples. The leaching of alkali and the formation of efflorescence were observed to occur at a reduced rate in samples derived solely from 100% ground granulated blast furnace slag (GBFS). In contrast, higher rates were identified in samples containing chemically bonded foundry sand. The incorporation of chemically bonded foundry sand elevated the mobility of alkali, leading to an increased formation of efflorescence in alkali-activated slag. Following a three-day immersion of the specimens in deionized water, nearly all of the sodium was leached from the samples, highlighting the limited affinity of sodium within the gel structure.
{"title":"Mitigation of Efflorescence and Alkali Leaching in Activated Slag Using Foundry Sand","authors":"N. Sithole","doi":"10.4028/p-k5cjzo","DOIUrl":"https://doi.org/10.4028/p-k5cjzo","url":null,"abstract":"This research aimed to examine the impact of foundry sand on alkali leaching and the formation of efflorescence in alkali-activated slag. The activation process involved the utilization of sodium hydroxide and sodium silicate solutions in activating ground-granulated blast furnace slag (GBFS) and sand samples. The leaching of alkali and the formation of efflorescence were observed to occur at a reduced rate in samples derived solely from 100% ground granulated blast furnace slag (GBFS). In contrast, higher rates were identified in samples containing chemically bonded foundry sand. The incorporation of chemically bonded foundry sand elevated the mobility of alkali, leading to an increased formation of efflorescence in alkali-activated slag. Following a three-day immersion of the specimens in deionized water, nearly all of the sodium was leached from the samples, highlighting the limited affinity of sodium within the gel structure.","PeriodicalId":17714,"journal":{"name":"Key Engineering Materials","volume":" 14","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140686134","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}
Soumaila Alassane Boukari, Ibrahim Elhadji Daou, Abdoulaye Garba Neino, Yaya Soro, Abdourahamane Tankari Dan Badjo, Kouassi Benjamin Yao, Kouakou Aphonse Yao
L'objectif de ce travail est la caractérisation morphologique et physico-chimique d'échantillons de sols issus d'activités d'orpaillage dans la région de Komabangou (Niger). Les analyses ont été réalisées à l'aide d'un microscope électronique à balayage couplé à la spectroscopie dispersive en énergie (SEM-EDS), d'un pH-mètre, d'un COT-mètre et par infrarouge. Les résultats obtenus ont montré que les sols des sites étudiés sont généralement acides. En effet, l'analyse infrarouge donne les constituants majoritaires : silice, calcite, aluminium, fer et magnésium. L'analyse MEB a montré la présence de feuilles d'argile dispersées sous forme de filaments ou d'amas d'agrégats qui peuvent être dus à la présence de carbonates ainsi qu'à la présence d'éléments traces métalliques. L'analyse par spectroscopie d'énergie dispersive (DES) du sol pollué du site (S1) a révélé la présence de 60,25 % d'oxygène (O) ; 18,70 % de carbone (C); 8,34 % de silice (SiO2 ); 4,72 % d'aluminium (Al); 0,86 % de fer (Fe); 0,79 % magnésium (Mg); 0,12 % de titane (Ti); 0,11 % de zinc (Zn); 0,06 % de cadmium (Cd) et 0,0 % de plomb (Pb). En revanche, pour le site périphérique (S3), on note 77,09 % d'oxygène (O) ; 14,49 % de silice (SiO 2 ); 8,89 % d'aluminium (Al); 1,11 % de fer (Fe); 0,34 % de potassium (K) et quelques traces de manganèse (0,03 %) ; cobalt (0,01 %) ; cuivre (0,01 %) ; nickel (0,01 %) ; chrome; cadmium; mener. Enfin, le site témoin (ET), qui est vierge, contient 67,56 % d'oxygène ; 17,86 % carbone; 9,18 % silice; 4,28 % aluminium ; 0,91 % de fer et 0,13 % de potassium.
{"title":"Morphological and Physico-Chemical Characterization of Soils from Gold Panning in Komabangou, Niger","authors":"Soumaila Alassane Boukari, Ibrahim Elhadji Daou, Abdoulaye Garba Neino, Yaya Soro, Abdourahamane Tankari Dan Badjo, Kouassi Benjamin Yao, Kouakou Aphonse Yao","doi":"10.4028/p-uyv2np","DOIUrl":"https://doi.org/10.4028/p-uyv2np","url":null,"abstract":"L'objectif de ce travail est la caractérisation morphologique et physico-chimique d'échantillons de sols issus d'activités d'orpaillage dans la région de Komabangou (Niger). Les analyses ont été réalisées à l'aide d'un microscope électronique à balayage couplé à la spectroscopie dispersive en énergie (SEM-EDS), d'un pH-mètre, d'un COT-mètre et par infrarouge. Les résultats obtenus ont montré que les sols des sites étudiés sont généralement acides. En effet, l'analyse infrarouge donne les constituants majoritaires : silice, calcite, aluminium, fer et magnésium. L'analyse MEB a montré la présence de feuilles d'argile dispersées sous forme de filaments ou d'amas d'agrégats qui peuvent être dus à la présence de carbonates ainsi qu'à la présence d'éléments traces métalliques. L'analyse par spectroscopie d'énergie dispersive (DES) du sol pollué du site (S1) a révélé la présence de 60,25 % d'oxygène (O) ; 18,70 % de carbone (C); 8,34 % de silice (SiO2 ); 4,72 % d'aluminium (Al); 0,86 % de fer (Fe); 0,79 % magnésium (Mg); 0,12 % de titane (Ti); 0,11 % de zinc (Zn); 0,06 % de cadmium (Cd) et 0,0 % de plomb (Pb). En revanche, pour le site périphérique (S3), on note 77,09 % d'oxygène (O) ; 14,49 % de silice (SiO 2 ); 8,89 % d'aluminium (Al); 1,11 % de fer (Fe); 0,34 % de potassium (K) et quelques traces de manganèse (0,03 %) ; cobalt (0,01 %) ; cuivre (0,01 %) ; nickel (0,01 %) ; chrome; cadmium; mener. Enfin, le site témoin (ET), qui est vierge, contient 67,56 % d'oxygène ; 17,86 % carbone; 9,18 % silice; 4,28 % aluminium ; 0,91 % de fer et 0,13 % de potassium.","PeriodicalId":17714,"journal":{"name":"Key Engineering Materials","volume":" 6","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140686009","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}
Taras Genovievo De Yonarosa, A. D. Pramata, Farhan Aryo Hutomo, Diah Susanti
Perovskite semiconductor have gained increasing attention in the recent years. However, pristine halide perovskites often faces bottle-neck related to low their stability. Herein, for the first time synthesis and fabrication of CsPbBr3/PAN fiber composite with electrospinning method is reported. CsPbBr3 quantum dots (QDs) embedded PAN fiber were successfully fabricated based on the XRD and FTIR test result. The result demonstrates electrospun fiber stable for over than one week in the condition of being immersed in water. The CsPbBr3 QDs was synthesized by Ligand Assisted Reprecipitation Process (LARP) method. The average particle size of our CsPbBr3 particle sizes ranging from 80 to 240 nm. Our findings reveal that the effect of variations between toluene and acetone had an effect on the size of the fiber and the intensity of photoluminescence reduction of the CsPbBr3/PAN fiber composite. Which is the smallest fiber and the lowest reduction intensity belongs to the 4:1 variation, namely with a fiber size of a 727.56 nm and a percentage decrease in intensity of 66,67%.
{"title":"Synthesis and Fabrication of Luminescence of CsPbBr3/PAN Nanocomposite Fiber","authors":"Taras Genovievo De Yonarosa, A. D. Pramata, Farhan Aryo Hutomo, Diah Susanti","doi":"10.4028/p-z88m9u","DOIUrl":"https://doi.org/10.4028/p-z88m9u","url":null,"abstract":"Perovskite semiconductor have gained increasing attention in the recent years. However, pristine halide perovskites often faces bottle-neck related to low their stability. Herein, for the first time synthesis and fabrication of CsPbBr3/PAN fiber composite with electrospinning method is reported. CsPbBr3 quantum dots (QDs) embedded PAN fiber were successfully fabricated based on the XRD and FTIR test result. The result demonstrates electrospun fiber stable for over than one week in the condition of being immersed in water. The CsPbBr3 QDs was synthesized by Ligand Assisted Reprecipitation Process (LARP) method. The average particle size of our CsPbBr3 particle sizes ranging from 80 to 240 nm. Our findings reveal that the effect of variations between toluene and acetone had an effect on the size of the fiber and the intensity of photoluminescence reduction of the CsPbBr3/PAN fiber composite. Which is the smallest fiber and the lowest reduction intensity belongs to the 4:1 variation, namely with a fiber size of a 727.56 nm and a percentage decrease in intensity of 66,67%.","PeriodicalId":17714,"journal":{"name":"Key Engineering Materials","volume":" 10","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140688504","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}
Aswathy S. Murali, Chippy Harish, Sherin Susan Cherian, Gayathri S. Nair, S. Lekshmi, Surya Gopidas, Beena Saraswathyamma
By means of electropolymerization process, a simple as well as proficient electrochemical sensor was developed for electrochemical resolution of tryptamine. The morphology and electrochemistry of thus fabricated poly (O-Phenylene diamine) reformed pencil graphite is evaluated thoroughly by FESEM along with DPV and CV respectively. Under experimental settings, finely resolved irreversible electro-oxidation peak at potential +0.594 V obtained for tryptamine on the altered electrode surface with phosphate buffer of pH 9 as supporting electrolyte. The oxidation peak current and tryptamine concentration are observed to possess linearity in the range of 0.4 μM to 117 μM with R2 = 0.99. Additionally the limit of detection (LOD) for tryptamine quantification is found as 0.2 μM. The sensor exhibited superior analytical properties such as high reproducibility, repeatability and anti-interference capability. The practical efficiency of fabricated sensor tested successfully in cheese obtained from milk.
{"title":"Poly(O-Phenylene Diamine) Reformed Pencil Graphite as the Disposable Electrochemical Sensor for Voltammetric Analysis of Tryptamine","authors":"Aswathy S. Murali, Chippy Harish, Sherin Susan Cherian, Gayathri S. Nair, S. Lekshmi, Surya Gopidas, Beena Saraswathyamma","doi":"10.4028/p-jfp00y","DOIUrl":"https://doi.org/10.4028/p-jfp00y","url":null,"abstract":"By means of electropolymerization process, a simple as well as proficient electrochemical sensor was developed for electrochemical resolution of tryptamine. The morphology and electrochemistry of thus fabricated poly (O-Phenylene diamine) reformed pencil graphite is evaluated thoroughly by FESEM along with DPV and CV respectively. Under experimental settings, finely resolved irreversible electro-oxidation peak at potential +0.594 V obtained for tryptamine on the altered electrode surface with phosphate buffer of pH 9 as supporting electrolyte. The oxidation peak current and tryptamine concentration are observed to possess linearity in the range of 0.4 μM to 117 μM with R2 = 0.99. Additionally the limit of detection (LOD) for tryptamine quantification is found as 0.2 μM. The sensor exhibited superior analytical properties such as high reproducibility, repeatability and anti-interference capability. The practical efficiency of fabricated sensor tested successfully in cheese obtained from milk.","PeriodicalId":17714,"journal":{"name":"Key Engineering Materials","volume":" 31","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140687594","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}
The main purpose of the research is to study the floating chips produced during mechanical processing. Chips derived from aluminium material cause several difficulties in mechanical processing. Research shows that floating chips clog filters in chip conveyors, resulting in significant downtime in production processes. In this article, cause-effect research has been carried out to find approaches to solving this problem.
{"title":"Chip Formation and Shaping in Milling Machining of Light Metal Casting Materials","authors":"Pascal Fritzsche, Ilgar Abbasov","doi":"10.4028/p-tftpu0","DOIUrl":"https://doi.org/10.4028/p-tftpu0","url":null,"abstract":"The main purpose of the research is to study the floating chips produced during mechanical processing. Chips derived from aluminium material cause several difficulties in mechanical processing. Research shows that floating chips clog filters in chip conveyors, resulting in significant downtime in production processes. In this article, cause-effect research has been carried out to find approaches to solving this problem.","PeriodicalId":17714,"journal":{"name":"Key Engineering Materials","volume":"31 2","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140740650","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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