首页 > 最新文献

Synthesis and Sintering最新文献

英文 中文
Examination of water uptake performance and mechanical properties of PLA/flax fiber biocomposites with the coupling agent 偶联剂对聚乳酸/亚麻纤维生物复合材料吸水性能和力学性能的影响
Pub Date : 2022-04-01 DOI: 10.53063/synsint.2022.22102
A. Avcı, Ayşegul Akdogan Eker, M. Bakkal, M. Bodur
The paper reports, the effect of water sorption on the microstructural and flexural properties of the flax fiber/ polylactic acid (PLA) biocomposites compared to the composites with maleic anhydride (MAH) as coupling agents and alkali treatment. In the current study, five different biocomposites which are 15 % wt. flax/PLA, 25 % wt. flax/PLA as control group and15 % wt. flax/PLA, 25 % wt. flax /PLA, and 35% wt. flax / PLA with 5 % wt. MAH was produced. Ten different soaking times were studied to understand the water absorption behavior of the biocomposites. To investigate mechanical properties of the biocomposites impact test was applied on the dry and 750 h, 1850 h water sorption composites. A three-point bending test was performed on the dry and 1850 h water sorption biocomposites to determine flexural properties. Short flax fiber-reinforced PLA matrix biocomposites were compounded using extrusion and manufactured by injection molding. Flax fiber surface was treated using sodium hydroxy solution to advance the interface interaction between fiber-matrix and surface performance of the fiber and matrix. According to the results, alkali treatment improved the water gain resistance of the composites since its enhancement of the interfacial bonding. Alkali-treated composites with maleic anhydride showed the better impact and flexural strength than composites without alkali-treated after 1850 h water sorption.
本文报道了吸水率对亚麻纤维/聚乳酸(PLA)生物复合材料微观结构和弯曲性能的影响,并与以马来酸酐(MAH)为偶联剂和碱处理的复合材料进行了比较。本研究以15%亚麻/PLA、25%亚麻/PLA为对照组,以15%亚麻/PLA、25%亚麻/PLA、35%亚麻/PLA和5% MAH为对照,制备了5种不同的生物复合材料。研究了10种不同浸泡时间对生物复合材料吸水性能的影响。为研究生物复合材料的力学性能,对干燥、750 h、1850 h的吸水复合材料进行了冲击试验。对干燥和1850 h的吸水生物复合材料进行三点弯曲试验,以确定其弯曲性能。采用挤压法制备了短亚麻纤维增强聚乳酸基生物复合材料。采用氢氧化钠溶液对亚麻纤维表面进行处理,提高纤维与基体的界面相互作用,提高纤维与基体的表面性能。结果表明,碱处理增强了复合材料的界面结合,提高了复合材料的抗水增益性能。经马来酸酐碱处理的复合材料在吸水1850 h后的抗冲击强度和抗弯强度均优于未经碱处理的复合材料。
{"title":"Examination of water uptake performance and mechanical properties of PLA/flax fiber biocomposites with the coupling agent","authors":"A. Avcı, Ayşegul Akdogan Eker, M. Bakkal, M. Bodur","doi":"10.53063/synsint.2022.22102","DOIUrl":"https://doi.org/10.53063/synsint.2022.22102","url":null,"abstract":"The paper reports, the effect of water sorption on the microstructural and flexural properties of the flax fiber/ polylactic acid (PLA) biocomposites compared to the composites with maleic anhydride (MAH) as coupling agents and alkali treatment. In the current study, five different biocomposites which are 15 % wt. flax/PLA, 25 % wt. flax/PLA as control group and15 % wt. flax/PLA, 25 % wt. flax /PLA, and 35% wt. flax / PLA with 5 % wt. MAH was produced. Ten different soaking times were studied to understand the water absorption behavior of the biocomposites. To investigate mechanical properties of the biocomposites impact test was applied on the dry and 750 h, 1850 h water sorption composites. A three-point bending test was performed on the dry and 1850 h water sorption biocomposites to determine flexural properties. Short flax fiber-reinforced PLA matrix biocomposites were compounded using extrusion and manufactured by injection molding. Flax fiber surface was treated using sodium hydroxy solution to advance the interface interaction between fiber-matrix and surface performance of the fiber and matrix. According to the results, alkali treatment improved the water gain resistance of the composites since its enhancement of the interfacial bonding. Alkali-treated composites with maleic anhydride showed the better impact and flexural strength than composites without alkali-treated after 1850 h water sorption.","PeriodicalId":22113,"journal":{"name":"Synthesis and Sintering","volume":"259 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73778440","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: 1
Recent advances in hydrogen production using MXenes-based metal sulfide photocatalysts mxenes基金属硫化物光催化剂制氢研究进展
Pub Date : 2022-03-29 DOI: 10.53063/synsint.2022.21106
Asieh Akhoondi, H. Ghaebi, L. Karuppasamy, Mohammed M. Rahman, P. Sathishkumar
At present, the composition and crystalline structure of transition metal nitrides or carbides (MXenes) and their derivatives are continuously expanding due to their unique physicochemical properties, especially in the photocatalytic field. Advances over the past four years have led to improved preparation of new MAX phases, resulting in new MXenes with excellent photo-thermal effect, considerable specific surface area, long-term stability and optimum activity. Since MXenes have good electrical conductivity and their bandgap is adjustable under the visible light range, this group is one of the best promising candidates for hydrogen production from photo-splitting of water as an environment-friendly method of converting sunlight to chemical energy. Progress in noble metal-free photocatalyst associated with more understanding of the fundamental mechanism of photocatalysis has enabled a proper choice of cocatalyst with better efficiency. In this study, the photocatalytic production of hydrogen through MXens as a support and co-catalyst on metal sulfide is summarized and discussed. Recent advances in the design and synthesis of MXenes-based metal sulfide nanocomposites to increase the efficiency of photocatalytic hydrogen production are then highlighted. Finally, the challenges and future prospects for the development of MXenes-based metal sulfide composites are outlined.
目前,过渡金属氮化物或碳化物(MXenes)及其衍生物由于其独特的物理化学性质,特别是在光催化领域,其组成和晶体结构不断扩大。在过去四年的进展中,新的MAX相的制备得到了改进,新的MXenes具有优异的光热效应、可观的比表面积、长期稳定性和最佳活性。由于MXenes具有良好的导电性,并且它们的带隙在可见光范围内是可调节的,因此作为一种将太阳光转化为化学能的环保方法,MXenes是最有前途的候选材料之一。随着对光催化基本机理的深入了解,无贵金属光催化剂的研究取得了进展,从而使人们能够正确选择具有更高效率的助催化剂。本文对MXens作为载体和助催化剂在金属硫化物上光催化制氢进行了综述和讨论。重点介绍了在设计和合成mxenes基金属硫化物纳米复合材料以提高光催化制氢效率方面的最新进展。最后,对mxenes基金属硫化物复合材料的发展面临的挑战和前景进行了展望。
{"title":"Recent advances in hydrogen production using MXenes-based metal sulfide photocatalysts","authors":"Asieh Akhoondi, H. Ghaebi, L. Karuppasamy, Mohammed M. Rahman, P. Sathishkumar","doi":"10.53063/synsint.2022.21106","DOIUrl":"https://doi.org/10.53063/synsint.2022.21106","url":null,"abstract":"At present, the composition and crystalline structure of transition metal nitrides or carbides (MXenes) and their derivatives are continuously expanding due to their unique physicochemical properties, especially in the photocatalytic field. Advances over the past four years have led to improved preparation of new MAX phases, resulting in new MXenes with excellent photo-thermal effect, considerable specific surface area, long-term stability and optimum activity. Since MXenes have good electrical conductivity and their bandgap is adjustable under the visible light range, this group is one of the best promising candidates for hydrogen production from photo-splitting of water as an environment-friendly method of converting sunlight to chemical energy. Progress in noble metal-free photocatalyst associated with more understanding of the fundamental mechanism of photocatalysis has enabled a proper choice of cocatalyst with better efficiency. In this study, the photocatalytic production of hydrogen through MXens as a support and co-catalyst on metal sulfide is summarized and discussed. Recent advances in the design and synthesis of MXenes-based metal sulfide nanocomposites to increase the efficiency of photocatalytic hydrogen production are then highlighted. Finally, the challenges and future prospects for the development of MXenes-based metal sulfide composites are outlined.","PeriodicalId":22113,"journal":{"name":"Synthesis and Sintering","volume":"51 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90374108","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: 6
Oxidation-affected zone in the sintered ZrB2–SiC–HfB2 composites 烧结ZrB2-SiC-HfB2复合材料的氧化影响区
Pub Date : 2022-03-26 DOI: 10.53063/synsint.2022.21111
E. Dodi, Z. Balak, Hosein Kafashan
Understanding the behavior of ultra-high temperature ceramics (UHTCs) against oxidation is of particular importance in high-temperature applications. In this study, ZrB2–SiC–HfB2 UHTC composites were fabricated by spark plasma sintering (SPS) method at different temperatures, times, and pressures to investigate the effects of sintering process variables on their oxidation resistance. Before the oxidation tests, the as-sintered samples contained ZrB2 and SiC phases with (Zr,Hf)B2 solid solution. The samples were subjected to oxidative conditions at 1400 °C and their relative mass changes were measured as a function of oxidation time up to 20 hours. FESEM and EDS equipment were used for microstructural and elemental analyzes of cross-sections of different oxide layers. Due to the oxygen diffusion, ZrO2 and SiO2 phases appeared alongside (Zr, Hf)O2 in the surface layers. After identifying the several oxides and SiC-depleted layers in the oxidation-affected zone, a schematic model for the arrangement of such layers was proposed.
了解超高温陶瓷(UHTCs)的抗氧化行为在高温应用中具有特别重要的意义。本研究采用火花等离子烧结(SPS)方法,在不同温度、时间和压力下制备ZrB2-SiC-HfB2 UHTC复合材料,研究烧结工艺变量对其抗氧化性能的影响。在氧化试验前,烧结试样中含有(Zr,Hf)B2固溶体的ZrB2和SiC相。将样品置于1400°C的氧化条件下,并测量其相对质量变化作为氧化时间长达20小时的函数。利用FESEM和EDS设备对不同氧化层的截面进行了显微组织和元素分析。由于氧的扩散作用,在表层中出现了与(Zr, Hf)O2相并存的ZrO2和SiO2相。在确定了氧化影响区内的几种氧化物和贫碳化硅层后,提出了氧化影响区内贫碳化硅层排列的示意图模型。
{"title":"Oxidation-affected zone in the sintered ZrB2–SiC–HfB2 composites","authors":"E. Dodi, Z. Balak, Hosein Kafashan","doi":"10.53063/synsint.2022.21111","DOIUrl":"https://doi.org/10.53063/synsint.2022.21111","url":null,"abstract":"Understanding the behavior of ultra-high temperature ceramics (UHTCs) against oxidation is of particular importance in high-temperature applications. In this study, ZrB2–SiC–HfB2 UHTC composites were fabricated by spark plasma sintering (SPS) method at different temperatures, times, and pressures to investigate the effects of sintering process variables on their oxidation resistance. Before the oxidation tests, the as-sintered samples contained ZrB2 and SiC phases with (Zr,Hf)B2 solid solution. The samples were subjected to oxidative conditions at 1400 °C and their relative mass changes were measured as a function of oxidation time up to 20 hours. FESEM and EDS equipment were used for microstructural and elemental analyzes of cross-sections of different oxide layers. Due to the oxygen diffusion, ZrO2 and SiO2 phases appeared alongside (Zr, Hf)O2 in the surface layers. After identifying the several oxides and SiC-depleted layers in the oxidation-affected zone, a schematic model for the arrangement of such layers was proposed.","PeriodicalId":22113,"journal":{"name":"Synthesis and Sintering","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79022471","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: 4
Performance of glucose, sucrose and cellulose as carbonaceous precursors for the synthesis of B4C powders 葡萄糖、蔗糖和纤维素作为碳质前驱体合成B4C粉末的性能
Pub Date : 2022-03-25 DOI: 10.53063/synsint.2022.21108
Seyed Faridaddin Feiz, L. Nikzad, H. Majidian, E. Salahi
Boron carbide is the third hardest material in the world after diamond and cubic boron nitride, which is one of the most strategic engineering ceramics in various industrial applications. The aim of this research is to synthesize B4C by reacting boric acid as boron source with polymers from the saccharide family as carbon sources, and to determine the best saccharide as precursor. For this purpose, glucose (monosaccharide), sucrose (disaccharide), and cellulose (polysaccharide) were used and examined. The samples were prepared by appropriate mixing of the starting materials, pyrolysis at 700 °C, and synthesis at 1500 °C. The results of Fourier transform infrared (FT-IR) spectroscopy and X-ray diffractometry (XRD) showed that among the studied saccharide polymers, glucose is the best carbon source candidate for the synthesis of B4C. To describe precisely, the specimen prepared with glucose and boric acid had more boron carbide and less hydrocarbon.
碳化硼是仅次于金刚石和立方氮化硼的世界第三硬材料,是各种工业应用中最具战略意义的工程陶瓷之一。本研究的目的是以硼酸为硼源,糖族聚合物为碳源,合成B4C,并确定最佳糖为前驱体。为此,葡萄糖(单糖)、蔗糖(双糖)和纤维素(多糖)被使用并进行了研究。原料适当混合,700℃热解,1500℃合成,制备样品。傅里叶变换红外光谱(FT-IR)和x射线衍射(XRD)结果表明,在研究的糖类聚合物中,葡萄糖是合成B4C的最佳候选碳源。准确地说,用葡萄糖和硼酸制备的样品含有更多的碳化硼和更少的碳氢化合物。
{"title":"Performance of glucose, sucrose and cellulose as carbonaceous precursors for the synthesis of B4C powders","authors":"Seyed Faridaddin Feiz, L. Nikzad, H. Majidian, E. Salahi","doi":"10.53063/synsint.2022.21108","DOIUrl":"https://doi.org/10.53063/synsint.2022.21108","url":null,"abstract":"Boron carbide is the third hardest material in the world after diamond and cubic boron nitride, which is one of the most strategic engineering ceramics in various industrial applications. The aim of this research is to synthesize B4C by reacting boric acid as boron source with polymers from the saccharide family as carbon sources, and to determine the best saccharide as precursor. For this purpose, glucose (monosaccharide), sucrose (disaccharide), and cellulose (polysaccharide) were used and examined. The samples were prepared by appropriate mixing of the starting materials, pyrolysis at 700 °C, and synthesis at 1500 °C. The results of Fourier transform infrared (FT-IR) spectroscopy and X-ray diffractometry (XRD) showed that among the studied saccharide polymers, glucose is the best carbon source candidate for the synthesis of B4C. To describe precisely, the specimen prepared with glucose and boric acid had more boron carbide and less hydrocarbon.","PeriodicalId":22113,"journal":{"name":"Synthesis and Sintering","volume":"29 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80144338","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: 3
Role of Ti3AlC2 MAX phase on characteristics of in-situ synthesized TiAl intermetallics. Part III: microstructure Ti3AlC2 MAX相对原位合成TiAl金属间化合物性能的影响第三部分:微观结构
Pub Date : 2022-03-20 DOI: 10.53063/synsint.2022.2182
M. Akhlaghi, E. Salahi, S. A. Tayebifard, G. Schmidt
In this paper, the 3rd part of a series of publications on the sinterability and characteristics of TiAl–Ti3AlC2 composites, the microstructure development during the synthesis and sintering processes was studied by scanning electron microscopy (SEM). Chemical evaluation of various phases in the developed microstructures was performed using energy-dispersive X-ray spectroscopy (EDS) in different ways such as point, line scan and two-dimensional elemental map analyses. For this purpose, five samples were fabricated with different percentages of Ti3AlC2 MAX phase additive (10, 15, 20, 25 and 30 wt%). Ball-milling and spark plasma sintering (SPS: 900 °C/7 min/40 MPa) of as-purchased Al and Ti powders with already-synthesized Ti3AlC2 additive were selected as composite making methodology. SEM/EDS analyses verified the in-situ manufacturing of TiAl/Ti3Al intermetallics as the matrix during the SPS process and the presence of Ti3AlC2 as the ex-situ added secondary phase. Moreover, the in-situ synthesis of Ti2AlC, another member of MAX phases in Ti-Al-C system, was also detected in titanium aluminide grain boundaries and attributed to a chemical reaction between TiC (an impurity in the initial Ti3AlC2 additive) and TiAl components.
本文是关于TiAl-Ti3AlC2复合材料的烧结性能和特性系列出版物的第3部分,利用扫描电子显微镜(SEM)研究了复合材料在合成和烧结过程中的微观结构发展。利用能量色散x射线能谱(EDS)以不同的方式,如点扫描、线扫描和二维元素图分析,对所开发的微观结构中的不同相进行化学评价。为此,用不同比例的Ti3AlC2 MAX相添加剂(10、15、20、25和30 wt%)制备了5个样品。采用球磨和放电等离子烧结(SPS: 900°C/7 min/40 MPa)制备Al和Ti粉末,并添加已合成的Ti3AlC2添加剂。SEM/EDS分析证实了在SPS过程中TiAl/Ti3Al金属间化合物作为基体的原位制造和Ti3AlC2作为非原位添加的二次相的存在。此外,Ti-Al-C体系中MAX相的另一个成员Ti2AlC也在钛铝化物晶界中被原位合成,并归因于TiC(初始Ti3AlC2添加剂中的杂质)与TiAl组分之间的化学反应。
{"title":"Role of Ti3AlC2 MAX phase on characteristics of in-situ synthesized TiAl intermetallics. Part III: microstructure","authors":"M. Akhlaghi, E. Salahi, S. A. Tayebifard, G. Schmidt","doi":"10.53063/synsint.2022.2182","DOIUrl":"https://doi.org/10.53063/synsint.2022.2182","url":null,"abstract":"In this paper, the 3rd part of a series of publications on the sinterability and characteristics of TiAl–Ti3AlC2 composites, the microstructure development during the synthesis and sintering processes was studied by scanning electron microscopy (SEM). Chemical evaluation of various phases in the developed microstructures was performed using energy-dispersive X-ray spectroscopy (EDS) in different ways such as point, line scan and two-dimensional elemental map analyses. For this purpose, five samples were fabricated with different percentages of Ti3AlC2 MAX phase additive (10, 15, 20, 25 and 30 wt%). Ball-milling and spark plasma sintering (SPS: 900 °C/7 min/40 MPa) of as-purchased Al and Ti powders with already-synthesized Ti3AlC2 additive were selected as composite making methodology. SEM/EDS analyses verified the in-situ manufacturing of TiAl/Ti3Al intermetallics as the matrix during the SPS process and the presence of Ti3AlC2 as the ex-situ added secondary phase. Moreover, the in-situ synthesis of Ti2AlC, another member of MAX phases in Ti-Al-C system, was also detected in titanium aluminide grain boundaries and attributed to a chemical reaction between TiC (an impurity in the initial Ti3AlC2 additive) and TiAl components.","PeriodicalId":22113,"journal":{"name":"Synthesis and Sintering","volume":"2015 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83401885","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: 2
Impact of bridging oxygens formation on optical properties of Fe3+ doped Li2O–Al2O3–SiO2–TiO2 glasses 桥氧形成对Fe3+掺杂Li2O-Al2O3-SiO2-TiO2玻璃光学性能的影响
Pub Date : 2022-03-13 DOI: 10.53063/synsint.2022.2179
A. Faeghinia
In this study, the structural chemistry of Fe3+ doped Li2O–Al2O3–SiO2–TiO2 (LAST) glasses has been analyzed utilizing UV-Vis spectroscopy. Optical parameters like absorption and extinction coefficients, indirect and direct optical band gaps, Urbach energy as well as Fermi energy level of samples were estimated via their absorption spectra. Then, it was tried to make a relationship between the variation of mentioned parameters and structural chemistry of different doped samples. Results of the investigation illustrated that even a little change in the microstructure of glassy samples has an effect on optical parameters and accordingly it could be sensible. Furthermore, it was revealed that Fe3+ ions have the role of network forming in the structure of glass by increasing the formation of bridging oxygens (BOs) in the matrix.
本研究利用紫外可见光谱分析了Fe3+掺杂Li2O-Al2O3-SiO2-TiO2 (LAST)玻璃的结构化学性质。通过吸收光谱估计样品的吸收消光系数、间接带隙和直接带隙、乌尔巴赫能和费米能级等光学参数。然后,试图建立上述参数的变化与不同掺杂样品的结构化学之间的关系。研究结果表明,即使玻璃样的微观结构发生很小的变化,也会对光学参数产生明显的影响。此外,还揭示了Fe3+离子通过增加基体中桥接氧(BOs)的形成,在玻璃结构中具有网络形成的作用。
{"title":"Impact of bridging oxygens formation on optical properties of Fe3+ doped Li2O–Al2O3–SiO2–TiO2 glasses","authors":"A. Faeghinia","doi":"10.53063/synsint.2022.2179","DOIUrl":"https://doi.org/10.53063/synsint.2022.2179","url":null,"abstract":"In this study, the structural chemistry of Fe3+ doped Li2O–Al2O3–SiO2–TiO2 (LAST) glasses has been analyzed utilizing UV-Vis spectroscopy. Optical parameters like absorption and extinction coefficients, indirect and direct optical band gaps, Urbach energy as well as Fermi energy level of samples were estimated via their absorption spectra. Then, it was tried to make a relationship between the variation of mentioned parameters and structural chemistry of different doped samples. Results of the investigation illustrated that even a little change in the microstructure of glassy samples has an effect on optical parameters and accordingly it could be sensible. Furthermore, it was revealed that Fe3+ ions have the role of network forming in the structure of glass by increasing the formation of bridging oxygens (BOs) in the matrix.","PeriodicalId":22113,"journal":{"name":"Synthesis and Sintering","volume":"35 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-03-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88354996","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
Molecular hydrogen production by radiolysis of water on the surface of nano-ZrO2 under the influence of gamma rays 伽玛射线作用下纳米zro2表面水的辐射解氢研究
Pub Date : 2022-02-19 DOI: 10.53063/synsint.2022.21105
G. Imanova
In this research, the radiation-heterogeneous processes of water decomposition on the surface of zirconium dioxide nanoparticles (n-ZrO2) were studied. The kinetics of buildup of molecular hydrogen during the radiolytic processes of water decomposition was also examined. The production of H2 and H2O2 through water radiolysis was investigated to develop a computational model and disclose the kinetic behavior of water radiolysis. The enthalpy of ZrO2 nanoparticles was studied at the temperature range T=1200-2900 K, in which ZrO2 nanoparticles has a two-phase transition. Some of the electrons were transported to the surface of the nanoparticles during the physical and physicochemical stages of the process and emitted into the water. At the same time, the migration of energy carriers in radioactively active oxide compounds changed at different intervals depending on the composition, structural stability, and electro-physical properties of the oxides.
研究了氧化锆纳米颗粒(n-ZrO2)表面水的辐射非均相分解过程。研究了水分解过程中氢分子积累的动力学过程。研究了水辐射解生成H2和H2O2的过程,建立了计算模型,揭示了水辐射解的动力学行为。研究了ZrO2纳米粒子在温度范围T=1200 ~ 2900 K时的焓值,在此温度范围内ZrO2纳米粒子发生了两相转变。在过程的物理和物理化学阶段,一些电子被传输到纳米粒子的表面,并排放到水中。同时,放射性活性氧化物中载流子的迁移随氧化物的组成、结构稳定性和电物理性质的不同而发生不同的时间间隔变化。
{"title":"Molecular hydrogen production by radiolysis of water on the surface of nano-ZrO2 under the influence of gamma rays","authors":"G. Imanova","doi":"10.53063/synsint.2022.21105","DOIUrl":"https://doi.org/10.53063/synsint.2022.21105","url":null,"abstract":"In this research, the radiation-heterogeneous processes of water decomposition on the surface of zirconium dioxide nanoparticles (n-ZrO2) were studied. The kinetics of buildup of molecular hydrogen during the radiolytic processes of water decomposition was also examined. The production of H2 and H2O2 through water radiolysis was investigated to develop a computational model and disclose the kinetic behavior of water radiolysis. The enthalpy of ZrO2 nanoparticles was studied at the temperature range T=1200-2900 K, in which ZrO2 nanoparticles has a two-phase transition. Some of the electrons were transported to the surface of the nanoparticles during the physical and physicochemical stages of the process and emitted into the water. At the same time, the migration of energy carriers in radioactively active oxide compounds changed at different intervals depending on the composition, structural stability, and electro-physical properties of the oxides.","PeriodicalId":22113,"journal":{"name":"Synthesis and Sintering","volume":"32 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78359168","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: 4
Synthesis and sintering of Fe-32Mn-6Si shape memory alloys prepared by mechanical alloying 机械合金化制备Fe-32Mn-6Si形状记忆合金的合成与烧结
Pub Date : 2022-02-07 DOI: 10.53063/synsint.2022.2185
A. Shamsipoor, Babak Mousavi, M. Shakeri
Fe-32Mn-6Si alloy was produced using the mechanical alloying (MA) process of high purity powders under an inert argon gas atmosphere. The aim of this investigation is the in-depth study of the microstructure and phase transformation during the milling-sintering process of Fe-32Mn-6Si shape memory alloys. During the milling process, a significant amount of amorphous phase was created as well the crystalline martensite and austenite phases. The amorphous phase was increased by milling time enhancement and then it was decreased due to the mechano-crystalization phenomenon. It was detected that the microhardness of the alloyed powder directly depends on the amount of the amorphous phase. Furthermore, the particle size of as-milled powder firstly decreased and then increased, when the amorphous phase cojoined gradually during the milling process the transformation of martensite into austenite. The lattice strain was increased considerably during the milling process which was a reason for martensite phase creation resulting in the high shape memory properties. The amount of pre-strain for Fe-32Mn-6Si alloy was calculated to be 3.3%. Furthermore, the optimum sintering temperature was approved to be 950 °C by reduction of the percentage of pores and suitable densification.
在惰性氩气气氛下,采用高纯度粉末机械合金化(MA)工艺制备了Fe-32Mn-6Si合金。本研究的目的是深入研究Fe-32Mn-6Si形状记忆合金在铣削-烧结过程中的组织和相变。在铣削过程中,产生了大量的非晶相以及结晶马氏体和奥氏体相。铣削时间的延长使非晶相增加,而机械结晶现象使非晶相减少。结果表明,合金粉末的显微硬度直接取决于非晶相的含量。铣削过程中,非晶相逐渐结合,马氏体向奥氏体转变,晶粒尺寸先减小后增大。在铣削过程中,晶格应变显著增加,这是马氏体相形成的原因,导致高形状记忆性能。计算出Fe-32Mn-6Si合金的预应变量为3.3%。通过降低气孔率和适当的致密化,确定了最佳烧结温度为950℃。
{"title":"Synthesis and sintering of Fe-32Mn-6Si shape memory alloys prepared by mechanical alloying","authors":"A. Shamsipoor, Babak Mousavi, M. Shakeri","doi":"10.53063/synsint.2022.2185","DOIUrl":"https://doi.org/10.53063/synsint.2022.2185","url":null,"abstract":"Fe-32Mn-6Si alloy was produced using the mechanical alloying (MA) process of high purity powders under an inert argon gas atmosphere. The aim of this investigation is the in-depth study of the microstructure and phase transformation during the milling-sintering process of Fe-32Mn-6Si shape memory alloys. During the milling process, a significant amount of amorphous phase was created as well the crystalline martensite and austenite phases. The amorphous phase was increased by milling time enhancement and then it was decreased due to the mechano-crystalization phenomenon. It was detected that the microhardness of the alloyed powder directly depends on the amount of the amorphous phase. Furthermore, the particle size of as-milled powder firstly decreased and then increased, when the amorphous phase cojoined gradually during the milling process the transformation of martensite into austenite. The lattice strain was increased considerably during the milling process which was a reason for martensite phase creation resulting in the high shape memory properties. The amount of pre-strain for Fe-32Mn-6Si alloy was calculated to be 3.3%. Furthermore, the optimum sintering temperature was approved to be 950 °C by reduction of the percentage of pores and suitable densification.","PeriodicalId":22113,"journal":{"name":"Synthesis and Sintering","volume":"48 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-02-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75143085","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: 1
Sol-gel zinc oxide nanoparticles: advances in synthesis and applications 溶胶-凝胶氧化锌纳米颗粒:合成与应用进展
Pub Date : 2021-12-29 DOI: 10.53063/synsint.2021.1477
Parisa Shafiee, Mehdi Reisi Nafchi, Sara Eskandarinezhad, S. Mahmoudi, E. Ahmadi
Zinc oxide nanoparticles (ZnO) exhibit numerous characteristics such as biocompatibility, UV protection, antibacterial activity, high thermal conductivity, binding energy, and high refractive index that make them ideal candidates to be applied in a variety of products like solar cells, rubber, cosmetics, as well as medical and pharmaceutical products. Different strategies for ZnO nanoparticles’ preparation have been applied: sol-gel method, co-precipitation method, etc. The sol-gel method is an economic and efficient chemical technique for nanoparticle (NPs) generation that has the ability to adjust the structural and optical features of the NPs. Nanostructures are generated from an aqueous solution including metallic precursors, chemicals for modifying pH using either a gel or a sol as a yield. Among the various approaches, the sol-gel technique was revealed to be one of the desirable techniques for the synthesis of ZnO nanoparticles. In this review, we explain some novel investigations about the synthesis of zinc oxide nanoparticles via sol-gel technique and applications of sol-gel zinc oxide nanoparticles. Furthermore, we study recent sol-gel ZnO nanoparticles, their significant characteristics, and their applications in biomedical applications, antimicrobial packaging, drug delivery, semiconductors, biosensors, catalysts, photoelectron devices, and textiles.
氧化锌纳米颗粒(ZnO)具有多种特性,如生物相容性、防紫外线、抗菌活性、高导热性、结合能和高折射率,使其成为太阳能电池、橡胶、化妆品以及医疗和制药产品等各种产品的理想候选者。制备ZnO纳米粒子的方法有溶胶-凝胶法、共沉淀法等。溶胶-凝胶法制备纳米粒子是一种经济、高效的制备纳米粒子的化学技术,它能够调节纳米粒子的结构和光学特性。纳米结构是由水溶液生成的,包括金属前体,用凝胶或溶胶作为产物来修饰pH值的化学物质。在各种方法中,溶胶-凝胶技术被认为是合成ZnO纳米颗粒的理想技术之一。本文综述了溶胶-凝胶法制备氧化锌纳米粒子的最新研究进展,以及溶胶-凝胶法制备氧化锌纳米粒子的应用。此外,我们研究了最新的溶胶-凝胶ZnO纳米粒子,它们的重要特性,以及它们在生物医学、抗菌包装、药物递送、半导体、生物传感器、催化剂、光电子器件和纺织品中的应用。
{"title":"Sol-gel zinc oxide nanoparticles: advances in synthesis and applications","authors":"Parisa Shafiee, Mehdi Reisi Nafchi, Sara Eskandarinezhad, S. Mahmoudi, E. Ahmadi","doi":"10.53063/synsint.2021.1477","DOIUrl":"https://doi.org/10.53063/synsint.2021.1477","url":null,"abstract":"Zinc oxide nanoparticles (ZnO) exhibit numerous characteristics such as biocompatibility, UV protection, antibacterial activity, high thermal conductivity, binding energy, and high refractive index that make them ideal candidates to be applied in a variety of products like solar cells, rubber, cosmetics, as well as medical and pharmaceutical products. Different strategies for ZnO nanoparticles’ preparation have been applied: sol-gel method, co-precipitation method, etc. The sol-gel method is an economic and efficient chemical technique for nanoparticle (NPs) generation that has the ability to adjust the structural and optical features of the NPs. Nanostructures are generated from an aqueous solution including metallic precursors, chemicals for modifying pH using either a gel or a sol as a yield. Among the various approaches, the sol-gel technique was revealed to be one of the desirable techniques for the synthesis of ZnO nanoparticles. In this review, we explain some novel investigations about the synthesis of zinc oxide nanoparticles via sol-gel technique and applications of sol-gel zinc oxide nanoparticles. Furthermore, we study recent sol-gel ZnO nanoparticles, their significant characteristics, and their applications in biomedical applications, antimicrobial packaging, drug delivery, semiconductors, biosensors, catalysts, photoelectron devices, and textiles.","PeriodicalId":22113,"journal":{"name":"Synthesis and Sintering","volume":"79 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74521384","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: 7
Hydrogen evolution via noble metals based photocatalysts: A review 贵金属基光催化剂析氢研究进展
Pub Date : 2021-12-29 DOI: 10.53063/synsint.2021.1468
Asieh Akhoondi, Anirudh Sharma, D. Pathak, M. Yusuf, T. Demissie, R. Guo, Adnan Ali
In recent decades, the use of photocatalysts in the evolution of hydrogen (H2) has received much attention. However, the use of the well-known titanium oxide and another photocatalyst as a base for noble metals is limited due to their major weakness in electron-hole pair separation. The use of cocatalysts can be a good way to overcome this problem and provide better performance for the evolution of hydrogen. In this review, suitable high-efficiency cocatalysts for solar hydrogen production have been thoroughly reviewed. New strategies and solutions were examined in terms of increasing the recombination of charge carriers, designing reactive sites, and enhancing the wavelengths of light absorption. Several new types of cocatalysts based on semiconductors in noble groups and dual metals have been evaluated. It is expected that these photocatalysts will be able to reduce the activation energy of reaction and charge separation. In this regard, the existing views and challenges in the field of photocatalysts are presented. The characteristics of monoatomic photocatalysts are reviewed in this manuscript and the latest advances in this field are summarized. Further, the future trends and upcoming research are also briefly discussed. Finally, this review presents noble metal-based photocatalysts for providing suitable photocatalysts on a larger scale and improving their applicability.
近几十年来,光催化剂在氢(H2)演化中的应用受到了广泛的关注。然而,使用众所周知的氧化钛和另一种光催化剂作为贵金属的碱是有限的,因为它们在电子-空穴对分离方面的主要弱点。使用助催化剂可以很好地克服这一问题,并为氢的演化提供更好的性能。本文综述了适用于太阳能制氢的高效助催化剂。从增加载流子的重组、设计反应位点、提高光吸收波长等方面探讨了新的策略和解决方案。介绍了几种基于贵金属和双金属的新型半导体共催化剂。期望这些光催化剂能够降低反应的活化能和电荷分离。在此基础上,提出了目前光催化剂领域存在的观点和挑战。本文综述了单原子光催化剂的特点,并对该领域的最新研究进展进行了综述。展望了未来的发展趋势和研究方向。最后,对贵金属基光催化剂进行了综述,以期提供更大规模的光催化剂,提高其适用性。
{"title":"Hydrogen evolution via noble metals based photocatalysts: A review","authors":"Asieh Akhoondi, Anirudh Sharma, D. Pathak, M. Yusuf, T. Demissie, R. Guo, Adnan Ali","doi":"10.53063/synsint.2021.1468","DOIUrl":"https://doi.org/10.53063/synsint.2021.1468","url":null,"abstract":"In recent decades, the use of photocatalysts in the evolution of hydrogen (H2) has received much attention. However, the use of the well-known titanium oxide and another photocatalyst as a base for noble metals is limited due to their major weakness in electron-hole pair separation. The use of cocatalysts can be a good way to overcome this problem and provide better performance for the evolution of hydrogen. In this review, suitable high-efficiency cocatalysts for solar hydrogen production have been thoroughly reviewed. New strategies and solutions were examined in terms of increasing the recombination of charge carriers, designing reactive sites, and enhancing the wavelengths of light absorption. Several new types of cocatalysts based on semiconductors in noble groups and dual metals have been evaluated. It is expected that these photocatalysts will be able to reduce the activation energy of reaction and charge separation. In this regard, the existing views and challenges in the field of photocatalysts are presented. The characteristics of monoatomic photocatalysts are reviewed in this manuscript and the latest advances in this field are summarized. Further, the future trends and upcoming research are also briefly discussed. Finally, this review presents noble metal-based photocatalysts for providing suitable photocatalysts on a larger scale and improving their applicability.","PeriodicalId":22113,"journal":{"name":"Synthesis and Sintering","volume":"140 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-12-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80037477","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: 7
期刊
Synthesis and Sintering
全部 Acc. Chem. Res. ACS Applied Bio Materials ACS Appl. Electron. Mater. ACS Appl. Energy Mater. ACS Appl. Mater. Interfaces ACS Appl. Nano Mater. ACS Appl. Polym. Mater. ACS BIOMATER-SCI ENG ACS Catal. ACS Cent. Sci. ACS Chem. Biol. ACS Chemical Health & Safety ACS Chem. Neurosci. ACS Comb. Sci. ACS Earth Space Chem. ACS Energy Lett. ACS Infect. Dis. ACS Macro Lett. ACS Mater. Lett. ACS Med. Chem. Lett. ACS Nano ACS Omega ACS Photonics ACS Sens. ACS Sustainable Chem. Eng. ACS Synth. Biol. Anal. Chem. BIOCHEMISTRY-US Bioconjugate Chem. BIOMACROMOLECULES Chem. Res. Toxicol. Chem. Rev. Chem. Mater. CRYST GROWTH DES ENERG FUEL Environ. Sci. Technol. Environ. Sci. Technol. Lett. Eur. J. Inorg. Chem. IND ENG CHEM RES Inorg. Chem. J. Agric. Food. Chem. J. Chem. Eng. Data J. Chem. Educ. J. Chem. Inf. Model. J. Chem. Theory Comput. J. Med. Chem. J. Nat. Prod. J PROTEOME RES J. Am. Chem. Soc. LANGMUIR MACROMOLECULES Mol. Pharmaceutics Nano Lett. Org. Lett. ORG PROCESS RES DEV ORGANOMETALLICS J. Org. Chem. J. Phys. Chem. J. Phys. Chem. A J. Phys. Chem. B J. Phys. Chem. C J. Phys. Chem. Lett. Analyst Anal. Methods Biomater. Sci. Catal. Sci. Technol. Chem. Commun. Chem. Soc. Rev. CHEM EDUC RES PRACT CRYSTENGCOMM Dalton Trans. Energy Environ. Sci. ENVIRON SCI-NANO ENVIRON SCI-PROC IMP ENVIRON SCI-WAT RES Faraday Discuss. Food Funct. Green Chem. Inorg. Chem. Front. Integr. Biol. J. Anal. At. Spectrom. J. Mater. Chem. A J. Mater. Chem. B J. Mater. Chem. C Lab Chip Mater. Chem. Front. Mater. Horiz. MEDCHEMCOMM Metallomics Mol. Biosyst. Mol. Syst. Des. Eng. Nanoscale Nanoscale Horiz. Nat. Prod. Rep. New J. Chem. Org. Biomol. Chem. Org. Chem. Front. PHOTOCH PHOTOBIO SCI PCCP Polym. Chem.
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
0
微信
客服QQ
Book学术公众号 扫码关注我们
反馈
×
意见反馈
请填写您的意见或建议
请填写您的手机或邮箱
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
Book学术官方微信
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术
文献互助 智能选刊 最新文献 互助须知 联系我们:info@booksci.cn
Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。
Copyright © 2023 Book学术 All rights reserved.
ghs 京公网安备 11010802042870号 京ICP备2023020795号-1