Materials Science Forum最新文献_第8页

Application of Phosphonium- and Choline Chloride Based Deep Eutectic Solvents as Catalyst for Emulsifier Production from Low Quality Oil Assisted by Microwave Irradiation 应用膦基和氯化胆碱深共晶溶剂作为催化剂，在微波辐照辅助下从低质油中生产乳化剂

Materials Science Forum Pub Date : 2024-02-15 DOI: 10.4028/p-o1zllv

Miranda Amiroh Sulaiman, S. Zullaikah, Hoo Peng Yong, A. Quitain

{"title":"Application of Phosphonium- and Choline Chloride Based Deep Eutectic Solvents as Catalyst for Emulsifier Production from Low Quality Oil Assisted by Microwave Irradiation","authors":"Miranda Amiroh Sulaiman, S. Zullaikah, Hoo Peng Yong, A. Quitain","doi":"10.4028/p-o1zllv","DOIUrl":"https://doi.org/10.4028/p-o1zllv","url":null,"abstract":"Monoglycerides (MAG) and Diglycerides (DAG) have wide applications in the food, pharmaceutical and cosmetic industries. Despite the economic competitiveness of producing this type of emulsifier from vegetable oils, the increasing demand for products with high nutritional value makes certain types of healthy oils such as rice bran oil (RBO) a potential raw material for high quality fats to serve this growing market. However, the high free fatty acids (FFA) and RBO content which is insoluble in acetone make it difficult to process and is categorized as a low-quality oil, causing RBO to be only used as biodiesel feedstock. Enzymatic catalytic route for glycerolysis of vegetable oil offers milder operating conditions and higher product selectivity (MAG) but it has high production costs and long processing time. In this study, biodegradable catalysts were used, namely deep eutectic solvents (DES) based on phosponium and choline chloride for glycerolysis of dewaxed/degummed RBO (DDRBO) assisted with microwave irradiation. Effects of different types of DES catalysts (phosphonium and choline chloride based DES) on DES-catalyzed glycerolysis of low quality oil will be evaluated using 5%wt of DES, 300 W(150°C) for about 15 minutes. Out of the four DESs used, DES [TBAB][PTSAM] and DES [ChCl][AcAd] both showed outstanding catalytic performance. Especially [ChCl][AcAd] as a reaction catalyst for DDRBO glycerolysis showed the best catalytic activity, and high selectivity for the formation of monoglycerides (MG). Meanwhile [TBAB][PTSAM] showed high selectivity (92.57%) for diglyceride (DG) formation.","PeriodicalId":507742,"journal":{"name":"Materials Science Forum","volume":"60 10","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139775166","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}

引用次数: 0

Solketal Reaction Optimization by Glycerol Acetalization Using Amberlyst-36 Catalyst 使用 Amberlyst-36 催化剂通过甘油乙缩醛优化 Solketal 反应

Materials Science Forum Pub Date : 2024-02-15 DOI: 10.4028/p-kiw3er

Putera Anugrah Dhira Atmaja Perdana, H. Sulistyo, M. M. Azis

引用次数: 0

Effect of Crystallization Properties of Continuous Basalt Fibers on Thermal Stability of Composite Materials 连续玄武岩纤维的结晶特性对复合材料热稳定性的影响

Materials Science Forum Pub Date : 2024-02-15 DOI: 10.4028/p-unbrc9

S. Ivanitskii, Yurii Chuvashov

{"title":"Effect of Crystallization Properties of Continuous Basalt Fibers on Thermal Stability of Composite Materials","authors":"S. Ivanitskii, Yurii Chuvashov","doi":"10.4028/p-unbrc9","DOIUrl":"https://doi.org/10.4028/p-unbrc9","url":null,"abstract":"The thermal stability of composite materials based on basalt fibers is determined by the strength of fibers under thermal stress. The decrease in strength occurs due to the crystallization of the original fibers and the development of microcrystalline nuclei in them during heating. Experimental studies of the influence of the processing temperature of continuous basalt fibers on their strength have been carried out. It has been established that the strength of fibers during their heat treatment up to 400оС decreases by 25 % from the initial one. At the temperature of approximately 500оС, the strength of the fibers is almost half. At 600оС, the fiber strength is 20 % of the initial strength. At a processing temperature of 700оС, the fiber is completely destroyed. The main reasons for the decrease in fiber strength are the development of microcrystalline nuclei that have formed in the fibers at the drawing stage in the crystallization zone. From above, this zone is determined by the temperature of the upper limit of melt crystallization, and from below it is limited by the glass transition temperature. The residence time of the melt in this range is the crystallization time. Calculations the speed of movement and the cooling rate of the melt stream during fiber drawing were carried out, which made it possible to determine the temperature zone and time of crystallization. The results of theoretical studies have shown that for the production of fibers used in composites, it is necessary to select such basalts and conditions for the fiber drawing, under which the values of the temperature zone and time of crystallization will be the smallest.","PeriodicalId":507742,"journal":{"name":"Materials Science Forum","volume":"419 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139834167","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}

引用次数: 0

Cermet Powders Based on TiAl Intermetallic for Thermal Spraying 基于钛铝金属间化合物的热喷涂金属陶瓷粉末

Materials Science Forum Pub Date : 2024-02-15 DOI: 10.4028/p-7ris3b

Oleksii Burlachenko, N. Vigilianska, Cezary Senderowski

引用次数: 0

Effect of Power and Exposure Time on the Microwave-Assisted Roasting of Refractory Gold Ore 功率和暴露时间对微波辅助焙烧难熔金矿的影响

Materials Science Forum Pub Date : 2024-02-15 DOI: 10.4028/p-l8nrjw

Abdul Hapid, S. Zullaikah, M. Mahfud, A. Kawigraha

{"title":"Effect of Power and Exposure Time on the Microwave-Assisted Roasting of Refractory Gold Ore","authors":"Abdul Hapid, S. Zullaikah, M. Mahfud, A. Kawigraha","doi":"10.4028/p-l8nrjw","DOIUrl":"https://doi.org/10.4028/p-l8nrjw","url":null,"abstract":"Reserves of high-grade gold ore worldwide are decreasing, and some industries have started processing refractory gold ore. Refractory gold ore contains sulfide minerals such as pyrite (FeS2), chalcopyrite (CuFeS2), galena (PbS), and sphalerite (ZnS). Gold in refractory ores occurs as fine-size gold-bearing sulfide minerals. In this study, the microwave-assisted roasting method has been investigated as a pretreatment for a refractory gold ore. This method can provide rapid heating radiation, cause micro-cracks, and trigger the decomposition of sulfide minerals. The presence of additive helps in the oxidation of sulfide minerals. The microwave-assisted roasting was carried out using variations in microwave power and time. Microwave power between 300 - 600 watts significantly affected the increase in roasting temperature and weight loss of refractory gold ore. The highest temperature reached 567°C in roasting at 800 watts for 30 minutes. The optimum condition for microwave roasting was achieved at 400 watts of power with a roasting time of 30 minutes. Metals extraction of Cu, Zn, Pb, and Fe reached 97.2%, 82.7%, 16.1%, and 2.1% in water leaching.","PeriodicalId":507742,"journal":{"name":"Materials Science Forum","volume":"557 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139834054","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}

引用次数: 0

Features of the Structural Formation of Tungsten Single Crystals in the Shape of Hollow Rotational Bodies 中空旋转体形状钨单晶的结构形成特征

Materials Science Forum Pub Date : 2024-02-15 DOI: 10.4028/p-sdyx6a

Yuriy Nikitenko, Viktor Shapovalov, Volodymyr Yakusha, O. Gnizdylo, Olena M. Berdnikova

引用次数: 0

Solketal Reaction Optimization by Glycerol Acetalization Using Amberlyst-36 Catalyst 使用 Amberlyst-36 催化剂通过甘油乙缩醛优化 Solketal 反应

Materials Science Forum Pub Date : 2024-02-15 DOI: 10.4028/p-kiw3er

Putera Anugrah Dhira Atmaja Perdana, H. Sulistyo, M. M. Azis

引用次数: 0

Synthesis and Characterization of Hierarchical Structure Au/ZnO Nanocomposites for Possible Photocatalytic Applications 可用于光催化应用的分层结构金/氧化锌纳米复合材料的合成与表征

Materials Science Forum Pub Date : 2024-02-15 DOI: 10.4028/p-piu3w7

Aldrin Lalem, Jay C. Dulog, Jared Deve P. Delicana, Romnick B. Unabia, Noel Lito B. Sayson, R. Capangpangan, A. Lubguban, Arnold A. Alguno

{"title":"Synthesis and Characterization of Hierarchical Structure Au/ZnO Nanocomposites for Possible Photocatalytic Applications","authors":"Aldrin Lalem, Jay C. Dulog, Jared Deve P. Delicana, Romnick B. Unabia, Noel Lito B. Sayson, R. Capangpangan, A. Lubguban, Arnold A. Alguno","doi":"10.4028/p-piu3w7","DOIUrl":"https://doi.org/10.4028/p-piu3w7","url":null,"abstract":"Semiconductor-metal nanocomposites are actively investigated for their diverse applications in emerging fields such as photocatalysis, photovoltaics, and chemical sensing. In this study, we synthesized ZnO semiconductor nanoparticles using a chemical bath deposition method with ZnSO4·7H2O and controlled NH4OH concentrations, facilitated by an anionic surfactant to enable the attachment of Au metal nanoparticles. Au nanoparticles were prepared from HAuCl4 using citrate as a reducing agent, and metal oxide was rapidly introduced to ensure a well-defined nanocomposite with a fixed 75 w/v% composition. Fast Fourier transform spectroscopy (FTIR) and Ultra-visible (UV-Vis) spectroscopy were used to provide clear evidence of Au/ZnO nanocomposite formation through the presence of distinctive peaks around 359nm and 518nm, with Dynamic Light Scattering (DLS) revealing contrasting average sizes for ZnO and Au, highlighting the significant size difference in the Au/ZnO nanocomposites. Additionally, the scanning electron microscopy – energy dispersive x-ray (SEM-EDS) analysis confirmed the successful presence of ZnO nanoparticles. These findings offer insights into the potential applications and unique properties of Au/ZnO nanocomposites for possible photocatalytic applications.","PeriodicalId":507742,"journal":{"name":"Materials Science Forum","volume":"198 ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139835938","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}

引用次数: 0

Synthesis and Characterization of AuNP/TiO2 Hybrid Nanoparticles for Possible Photocatalytic Application 可用于光催化应用的 AuNP/TiO2 混合纳米粒子的合成与表征

Materials Science Forum Pub Date : 2024-02-15 DOI: 10.4028/p-ogeu80

Jay C. Dulog, Romnick B. Unabia, Jared Deve P. Delicana, Aldrin Lalem, Noel Lito B. Sayson, R. Capangpangan, A. Lubguban, Arnold A. Alguno

{"title":"Synthesis and Characterization of AuNP/TiO2 Hybrid Nanoparticles for Possible Photocatalytic Application","authors":"Jay C. Dulog, Romnick B. Unabia, Jared Deve P. Delicana, Aldrin Lalem, Noel Lito B. Sayson, R. Capangpangan, A. Lubguban, Arnold A. Alguno","doi":"10.4028/p-ogeu80","DOIUrl":"https://doi.org/10.4028/p-ogeu80","url":null,"abstract":"Nanoparticles have been intensively studied due to their unique, size-dependent properties, paving the way for various applications, particularly in photocatalysis. This study aims to determine the physicochemical characteristics of TiO2 and Au nanoparticles and the AuNP/TiO2 hybrid nanoparticles. Employing multiple characterization techniques, the structural and functional parameters were elucidated. The Brunauer-Emmett-Teller (BET) surface area analysis revealed the pore sizes of TiO2 and the Au/TiO2 hybrid nanoparticles as 12 nm and 18 nm, respectively. The Dynamic light scattering (DLS) measurements revealed the hydrodynamic size of the AuNP/TiO2 hybrid nanoparticles at 386 nm. The UV-visible spectroscopy showed the absorbance peaks associated with their electronic structures and potential photocatalytic applications. The fast Fourier infrared (FTIR) spectroscopy results revealed the surface molecular interactions crucial for nanoparticle functionalities. The AuNP/TiO2 hybrid nanoparticles exhibit a larger pore size compared to TiO2NPs, indicating their superior adsorption capability. Moreover, the unique band gap of TiO2NPs and electron-hole pair generation make it a formidable candidate for photocatalysis. The incorporation of AuNPs may further augment charge separation, optimizing photocatalytic activity. These findings spotlight the promise of these AuNP/TiO2 hybrid nanoparticles in possible photocatalytic applications.","PeriodicalId":507742,"journal":{"name":"Materials Science Forum","volume":"396 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139834375","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}

引用次数: 0

Application of Phosphonium- and Choline Chloride Based Deep Eutectic Solvents as Catalyst for Emulsifier Production from Low Quality Oil Assisted by Microwave Irradiation 应用膦基和氯化胆碱深共晶溶剂作为催化剂，在微波辐照辅助下从低质油中生产乳化剂

Materials Science Forum Pub Date : 2024-02-15 DOI: 10.4028/p-o1zllv

Miranda Amiroh Sulaiman, S. Zullaikah, Hoo Peng Yong, A. Quitain

{"title":"Application of Phosphonium- and Choline Chloride Based Deep Eutectic Solvents as Catalyst for Emulsifier Production from Low Quality Oil Assisted by Microwave Irradiation","authors":"Miranda Amiroh Sulaiman, S. Zullaikah, Hoo Peng Yong, A. Quitain","doi":"10.4028/p-o1zllv","DOIUrl":"https://doi.org/10.4028/p-o1zllv","url":null,"abstract":"Monoglycerides (MAG) and Diglycerides (DAG) have wide applications in the food, pharmaceutical and cosmetic industries. Despite the economic competitiveness of producing this type of emulsifier from vegetable oils, the increasing demand for products with high nutritional value makes certain types of healthy oils such as rice bran oil (RBO) a potential raw material for high quality fats to serve this growing market. However, the high free fatty acids (FFA) and RBO content which is insoluble in acetone make it difficult to process and is categorized as a low-quality oil, causing RBO to be only used as biodiesel feedstock. Enzymatic catalytic route for glycerolysis of vegetable oil offers milder operating conditions and higher product selectivity (MAG) but it has high production costs and long processing time. In this study, biodegradable catalysts were used, namely deep eutectic solvents (DES) based on phosponium and choline chloride for glycerolysis of dewaxed/degummed RBO (DDRBO) assisted with microwave irradiation. Effects of different types of DES catalysts (phosphonium and choline chloride based DES) on DES-catalyzed glycerolysis of low quality oil will be evaluated using 5%wt of DES, 300 W(150°C) for about 15 minutes. Out of the four DESs used, DES [TBAB][PTSAM] and DES [ChCl][AcAd] both showed outstanding catalytic performance. Especially [ChCl][AcAd] as a reaction catalyst for DDRBO glycerolysis showed the best catalytic activity, and high selectivity for the formation of monoglycerides (MG). Meanwhile [TBAB][PTSAM] showed high selectivity (92.57%) for diglyceride (DG) formation.","PeriodicalId":507742,"journal":{"name":"Materials Science Forum","volume":"194 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139834742","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}

引用次数: 0