Journal of Materials Science最新文献

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Hybrid organosilane nanofibre scaffold formation supporting cell adhesion and growth 支持细胞粘附和生长的混合有机硅纳米纤维支架的形成
IF 3.5 3区 材料科学
Journal of Materials Science Pub Date : 2024-10-23 DOI: 10.1007/s10853-024-10324-0
Christopher Hobbs, Johana Kulhánková, Barbora Nikendey Holubová, Andrii Mahun, Libor Kobera, Jakub Erben, Věra Hedvičáková, Šárka Hauzerová, Miroslava Rysová, Veronika Máková
{"title":"Hybrid organosilane nanofibre scaffold formation supporting cell adhesion and growth","authors":"Christopher Hobbs,&nbsp;Johana Kulhánková,&nbsp;Barbora Nikendey Holubová,&nbsp;Andrii Mahun,&nbsp;Libor Kobera,&nbsp;Jakub Erben,&nbsp;Věra Hedvičáková,&nbsp;Šárka Hauzerová,&nbsp;Miroslava Rysová,&nbsp;Veronika Máková","doi":"10.1007/s10853-024-10324-0","DOIUrl":"10.1007/s10853-024-10324-0","url":null,"abstract":"<div><p>Hybrid organic–inorganic nanomaterials made of various types of organosilanes display very promising applications in a variety of fields, including biocompatible materials. Currently, these types of nanomaterials are studied in various physical forms due to the tunable combination of organic and inorganic parts bringing numerous properties into the field of medicine. Particularly, in the field of regenerative medicine, nanofibrous organosilane scaffolds are under wide investigation due to their morphological similarity to the extracellular matrix. Here, we describe the economically and procedurally simple synthesis and successful preparation of pure organosilane nanofibres (NFs) using only an <i>N</i>,<i>N</i>´-bis(3-(triethoxysilyl)propyl)oxamide precursor via a one-pot synthesis process utilising the acid-catalysed sol–gel process. Unlike established practices, the organosilane scaffolds proposed in this work are prepared thanks to the conscious and precise setting of the sol–gel process parameters without the need for any potentially harmful additives such as co-polymers, surfactants, and/or alkoxides. In addition, the synthesis of the precursor (BTPO) contains silicates for the polymerisation and a simple organic alkyl linker with amide bonds being akin to the biological friendly peptide bond. BTPO NFs were successfully electrospun on a large scale using a Nanospider™ and fully characterised and analysed for cytocompatibility using 3T3 fibroblasts. Formed organosilane NFs displaying negligible cytotoxicity, along with good cell proliferation and metabolic activity, open up the possibility of introducing various organic structures, using the synthetic strategies presented here, for inherent functional properties which could be exploited further in tissue engineering.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":645,"journal":{"name":"Journal of Materials Science","volume":"59 41","pages":"19612 - 19627"},"PeriodicalIF":3.5,"publicationDate":"2024-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142565772","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effect of passivation layers in bilayer with ZrO2 on Ge substrate for improved thermal stability 在 Ge 基底上与 ZrO2 形成双层钝化层对提高热稳定性的影响
IF 3.5 3区 材料科学
Journal of Materials Science Pub Date : 2024-10-23 DOI: 10.1007/s10853-024-10309-z
Byoungjun Won, Geun-Ha Oh, Il-Kwon Oh
{"title":"Effect of passivation layers in bilayer with ZrO2 on Ge substrate for improved thermal stability","authors":"Byoungjun Won,&nbsp;Geun-Ha Oh,&nbsp;Il-Kwon Oh","doi":"10.1007/s10853-024-10309-z","DOIUrl":"10.1007/s10853-024-10309-z","url":null,"abstract":"<div><p>In this study, the effects of Al<sub>2</sub>O<sub>3</sub> and Y<sub>2</sub>O<sub>3</sub> passivation layers on Ge substrates are investigated to enhance the thermal stability of Ge-based devices. Using X-ray photoelectron spectroscopy, we analyze the growth characteristics and chemical composition of Al<sub>2</sub>O<sub>3</sub>, Y<sub>2</sub>O<sub>3</sub>, and ZrO<sub>2</sub> on Ge. The changes in the crystallinity of ZrO<sub>2</sub> on different substrates of Ge, Al<sub>2</sub>O<sub>3</sub>/Ge, and Y<sub>2</sub>O<sub>3</sub>/Ge configurations are observed via X-ray diffraction. Material properties, including capacitance, flat band voltage shift (Δ<i>V</i><sub>FB</sub>), oxide charge trap (<i>N</i><sub>ot</sub>), interface defect density (<i>D</i><sub>it</sub>), and leakage current, are analyzed using the metal–oxide–semiconductor capacitor, with a particular focus on their electrical characteristics. Additionally, we investigate whether the passivation mechanisms of each material are more suitable for enhancing thermal stability. Overall, this study provides insight into the role of passivation layers in improving the interface and thermal stability of Ge-based devices, offering valuable contributions to the advancement of semiconductor technology.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":645,"journal":{"name":"Journal of Materials Science","volume":"59 41","pages":"19584 - 19595"},"PeriodicalIF":3.5,"publicationDate":"2024-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142565771","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Insight into stress corrosion cracking in heat-affected zone of Nb micro-alloyed high-strength low-alloy steel in SO2-polluted seawater 对二氧化硫污染海水中 Nb 微合金高强度低合金钢热影响区应力腐蚀开裂的深入研究
IF 3.5 3区 材料科学
Journal of Materials Science Pub Date : 2024-10-22 DOI: 10.1007/s10853-024-10290-7
Heng Chen, Endian Fan, Chao Li, Yunhua Huang, Lin Lu, Xiaogang Li
{"title":"Insight into stress corrosion cracking in heat-affected zone of Nb micro-alloyed high-strength low-alloy steel in SO2-polluted seawater","authors":"Heng Chen,&nbsp;Endian Fan,&nbsp;Chao Li,&nbsp;Yunhua Huang,&nbsp;Lin Lu,&nbsp;Xiaogang Li","doi":"10.1007/s10853-024-10290-7","DOIUrl":"10.1007/s10853-024-10290-7","url":null,"abstract":"<div><p>In this work, the effects of Nb micro-alloying on the stress corrosion cracking (SCC) behaviors of the heat-affected zone (HAZ) of high-strength low-alloy (HSLA) steel exposed to SO<sub>2</sub>-polluted seawater were investigated using electrochemical measurements, static load U-bend immersion tests and slow strain rate tensile experiments combined with fractographic observations. Results indicated that Nb existed in solute status in the coarse-grained HAZ (CGHAZ) while simultaneously in the form of solute status and NbC precipitate in the fine-grained HAZ (FGHAZ) and inter-critical HAZ (ICHAZ). With reduced prior austenite grain sizes, Nb micro-alloying refined the lath bainite in the CGHAZ as well as induced the formation of acicular ferrite in the FGHAZ and granular bainite in the ICHAZ. Moreover, the three types of HAZ microstructures had a high SCC susceptibility in SO<sub>2</sub>-polluted seawater in the increasing order of ICHAZ &lt; FGHAZ &lt; CGHAZ under the combined mechanism of anodic dissolution and hydrogen embrittlement. Nevertheless, attributing to the variations of microstructural constituents and the presence of NbC precipitates, Nb micro-alloying was capable to enhance the SCC resistance of HAZ microstructures by inhibiting the initiation and propagation of SCC cracks, with the SCC susceptibility decreased by ~ 5%, ~ 28% and 24% for CGHAZ, FGHAZ and ICHAZ, respectively.</p></div>","PeriodicalId":645,"journal":{"name":"Journal of Materials Science","volume":"59 41","pages":"19651 - 19674"},"PeriodicalIF":3.5,"publicationDate":"2024-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142565985","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Effects of La addition on the microstructure, corrosion behavior and discharge performance of the as-casted AP63 anodes for Mg–air batteries 添加 La 对镁-空气电池 AP63 阳极的微观结构、腐蚀行为和放电性能的影响
IF 3.5 3区 材料科学
Journal of Materials Science Pub Date : 2024-10-21 DOI: 10.1007/s10853-024-10314-2
Pengfei Hua, Jiaqi Liu, Yanfu Chai, Hongsen Shang, Kui Wang, Huabao Yang, Yan Zhang, Bin Jiang
{"title":"Effects of La addition on the microstructure, corrosion behavior and discharge performance of the as-casted AP63 anodes for Mg–air batteries","authors":"Pengfei Hua,&nbsp;Jiaqi Liu,&nbsp;Yanfu Chai,&nbsp;Hongsen Shang,&nbsp;Kui Wang,&nbsp;Huabao Yang,&nbsp;Yan Zhang,&nbsp;Bin Jiang","doi":"10.1007/s10853-024-10314-2","DOIUrl":"10.1007/s10853-024-10314-2","url":null,"abstract":"<div><p>The impacts of La additions on the microstructures, corrosion resistance and discharge performance of the as-cast Mg–6Al–3Pb (wt. %) anodes for Mg–air batteries were systematically investigated. The Mg–6Al–3Pb–<i>x</i>La (<i>x</i> = 0, 0.5, 1 and 2 wt. %) alloys primarily consisted of <i>α</i>-Mg, <i>β</i>-Mg<sub>17</sub>Al<sub>12</sub>, Al<sub>11</sub>La<sub>3</sub> and LaAl<sub>3</sub> phases. The results indicated that the addition of La could not only increase the volume fraction of the second phase, leading to the formation of Al<sub>11</sub>La<sub>3</sub> and LaAl<sub>3</sub> phases, but also effectively promote grain refinement. In terms of discharge performance, the AP63–1La alloy exhibited a high steady discharge voltage of −1.71 V (vs. SCE) at 10 mA·cm<sup>−2</sup>. Regarding corrosion behaviors, the corrosion resistance of the alloys initially decreased and then increased with increasing La content. Notably, the AP63–2La alloy demonstrated the best corrosion resistance, due to the high proportion of acicular second phase inhibiting the corrosion process.</p></div>","PeriodicalId":645,"journal":{"name":"Journal of Materials Science","volume":"59 41","pages":"19675 - 19692"},"PeriodicalIF":3.5,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142565938","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Superhydrophobic composite coatings for photocatalysis and oil–water separation: durable and eco-friendly solutions for industrial applications 用于光催化和油水分离的超疏水复合涂料:工业应用中的耐用和环保解决方案
IF 3.5 3区 材料科学
Journal of Materials Science Pub Date : 2024-10-21 DOI: 10.1007/s10853-024-10292-5
Honghong Wei, Xiangyou Lu, Yuanlai Xie, Jie Liang, Dong Xu, Yingqing Wu
{"title":"Superhydrophobic composite coatings for photocatalysis and oil–water separation: durable and eco-friendly solutions for industrial applications","authors":"Honghong Wei,&nbsp;Xiangyou Lu,&nbsp;Yuanlai Xie,&nbsp;Jie Liang,&nbsp;Dong Xu,&nbsp;Yingqing Wu","doi":"10.1007/s10853-024-10292-5","DOIUrl":"10.1007/s10853-024-10292-5","url":null,"abstract":"<div><p>Synthesized DE@HTDMS-SiO<sub>2</sub> particles loaded with TiO<sub>2</sub> nanoparticles, linked to adhesive epoxy resin and the green hydrophobic agent cetyltrimethoxysilane, were utilized to fabricate superhydrophobic composite coatings on various substrates using a simple spraying technique. The resulting composite coating exhibited a contact angle of 156.6° and a rolling angle of 7.6°, demonstrating excellent self-cleaning properties, antifouling capabilities, and durability. The photocatalytic performance was evaluated by using visible light from a 220 W incandescent lamp as a light source. The results indicated that the composite coating could degrade both RhB and MB solutions by over 90%. In a custom-made oil–water separation device, the composite-coated cotton fabric achieved a separation efficiency exceeding 96% for mixtures of n-hexane and diesel. Even after 10 cycles of repeated separation, the efficiency remained above 89%. This underscores the composite coating’s remarkable photocatalytic performance and its capacity for efficient, recyclable oil–water separation. Furthermore, the hydrophobic angle of the composite superhydrophobic glass sheet decreased by only 2.3° after undergoing a three-month outdoor aging experiment. Additionally, the composite-coated cotton fabric maintained a certain level of hydrophobicity even after being submerged in a strong alkali solution for 24 h.</p><h3>Graphical abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div></div>","PeriodicalId":645,"journal":{"name":"Journal of Materials Science","volume":"59 41","pages":"19508 - 19523"},"PeriodicalIF":3.5,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142565936","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A study on the hydrolytic properties of CaxSiy alloys 关于 CaxSiy 合金水解特性的研究
IF 3.5 3区 材料科学
Journal of Materials Science Pub Date : 2024-10-21 DOI: 10.1007/s10853-024-10286-3
Yican Chu, Zhendong Yao, Min Liu, Wenqing Li, Jing Gu, Zhenguang Huang, Jiaxing Xie, Chao Li, Yongfu Cui, Yun Li, Meiqiang Fan
{"title":"A study on the hydrolytic properties of CaxSiy alloys","authors":"Yican Chu,&nbsp;Zhendong Yao,&nbsp;Min Liu,&nbsp;Wenqing Li,&nbsp;Jing Gu,&nbsp;Zhenguang Huang,&nbsp;Jiaxing Xie,&nbsp;Chao Li,&nbsp;Yongfu Cui,&nbsp;Yun Li,&nbsp;Meiqiang Fan","doi":"10.1007/s10853-024-10286-3","DOIUrl":"10.1007/s10853-024-10286-3","url":null,"abstract":"<div><p>The hydrolysis of silicon and its compounds to produce hydrogen for fuel cell remains a major problem. The main obstacle is the weak hydrolytic activity and slow kinetics of silicon. In this work, the alloying properties of Si and Ca to improve its hydrolytic activity, and studied the film breaking effect of different metals and halogen ions on its passivation layer. The results show that the hydrogen production of the alloy is still determined by its phase composition. Among the common metal (Ni, Bi, Sn) and halogen ions (F<sup>–</sup>, Cl<sup>–</sup>) catalyzed by hydrolysis, Ni and F<sup>–</sup> showed a good synergistic effect, resulting in a hydrogen yield of 269 mL/g at room temperature without alkali.</p><h3>Graphical Abstract</h3>\u0000<div><figure><div><div><picture><source><img></source></picture></div></div></figure></div><p>\u0000 The effects of metal ions and halogens on the hydrolytic properties of Ca–Si alloy were investigated, and Ni<sup>2+</sup> and F<sup>—</sup> showed good synergistic effect.</p></div>","PeriodicalId":645,"journal":{"name":"Journal of Materials Science","volume":"59 41","pages":"19642 - 19650"},"PeriodicalIF":3.5,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142565939","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Corrosion behavior of Zr55Cu30Al10Ni5 amorphous alloy produced by two-roll strip casting in aqueous environments 双辊带材铸造生产的 Zr55Cu30Al10Ni5 非晶合金在水环境中的腐蚀行为
IF 3.5 3区 材料科学
Journal of Materials Science Pub Date : 2024-10-21 DOI: 10.1007/s10853-024-10322-2
Li Xin Wang, Zhu Yan, Chen Yang Zhang, Yuan Xiang Zhang, Jian Kang, ZhenLei Li, Guo Yuan
{"title":"Corrosion behavior of Zr55Cu30Al10Ni5 amorphous alloy produced by two-roll strip casting in aqueous environments","authors":"Li Xin Wang,&nbsp;Zhu Yan,&nbsp;Chen Yang Zhang,&nbsp;Yuan Xiang Zhang,&nbsp;Jian Kang,&nbsp;ZhenLei Li,&nbsp;Guo Yuan","doi":"10.1007/s10853-024-10322-2","DOIUrl":"10.1007/s10853-024-10322-2","url":null,"abstract":"<div><p>The corrosion resistance of Zr<sub>55</sub>Cu<sub>30</sub>Al<sub>10</sub>Ni<sub>5</sub> amorphous alloys fabricated by twin-roll strip casting using various process parameters was systematically investigated compared with 316 stainless steel. Potentiodynamic polarization tests indicated that pure amorphous alloy sheets possessed the best passivation in NaOH and H<sub>2</sub>SO<sub>4</sub> solutions, but pitting corrosion was observed in NaCl solution. In NaOH and H<sub>2</sub>SO<sub>4</sub> solution, the corrosion current density of amorphous matrix is increased by nearly two times, and the corrosion rate increases accordingly. The presence of Al-rich microcrystallites retained from the melt in the amorphous matrix reduces the corrosion resistance of the sheets. The preferential attack occurs on the microcrystallites due to the formation of a passivation film of composition and structure different from that of the substrate. The study on the corrosion properties of twin-roll cast-rolling amorphous provides theoretical guidance for expanding its practical application. It provides new ideas to extend the application of amorphous alloys in practical environments.</p></div>","PeriodicalId":645,"journal":{"name":"Journal of Materials Science","volume":"59 41","pages":"19693 - 19706"},"PeriodicalIF":3.5,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142565887","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Visible-driven photocatalytic activity and stability of Bi2O3 enhanced by CQDs CQDs 增强 Bi2O3 的可见光驱动光催化活性和稳定性
IF 3.5 3区 材料科学
Journal of Materials Science Pub Date : 2024-10-21 DOI: 10.1007/s10853-024-10327-x
Yan Gao, Sipin Zhu, Zhaopeng Wang, Guimei Chen, Chunying Wang
{"title":"Visible-driven photocatalytic activity and stability of Bi2O3 enhanced by CQDs","authors":"Yan Gao,&nbsp;Sipin Zhu,&nbsp;Zhaopeng Wang,&nbsp;Guimei Chen,&nbsp;Chunying Wang","doi":"10.1007/s10853-024-10327-x","DOIUrl":"10.1007/s10853-024-10327-x","url":null,"abstract":"<div><p>Bi<sub>2</sub>O<sub>3</sub> is an excellent visible light photocatalyst. However, the structural instability limits its activity and engineering application. To enhance the activity and stability, the composite of CQDs and Bi<sub>2</sub>O<sub>3</sub> was constructed by solvothermal method, and the physical–chemical properties of prepared composite were characterized using XRD, TEM, XPS, FTIR and TPC. As the target pollutant, bisphenol A (BPA) was used to investigate the photocatalytic activity and the stability of CQDs@Bi<sub>2</sub>O<sub>3</sub> by photodegradation experiment under the irradiation of simulated visible light, and butyl xanthate was used to prove the applicability by mung bean sprouts. As the results, the existence of CODs obviously promoted the photocatalytic activity of Bi<sub>2</sub>O<sub>3</sub>:10% CQDs@Bi<sub>2</sub>O<sub>3</sub> could remove 93.7% of BPA in 120 min, and the reaction constant rate was almost 1.5 time of pure Bi<sub>2</sub>O<sub>3.</sub> Moreover, 10%CQDs@Bi<sub>2</sub>O<sub>3</sub> could effectively remove butyl xanthate and greatly reduce the growth toxicity on mung bean sprouts. After doping with CQDs, the electron transfer path on the surface of the catalyst could effectively inhibit the electron–hole composite and improve the stability of the composite to a certain extent.</p></div>","PeriodicalId":645,"journal":{"name":"Journal of Materials Science","volume":"59 41","pages":"19492 - 19507"},"PeriodicalIF":3.5,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142565937","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
New stable rare earth Ti-based semiconductor pyrochlore oxides for low-cost energy applications 用于低成本能源应用的新型稳定稀土钛基半导体火成氧化物
IF 3.5 3区 材料科学
Journal of Materials Science Pub Date : 2024-10-21 DOI: 10.1007/s10853-024-10149-x
Zeesham Abbas, Kisa Fatima, Adeela Naz, Amna Parveen, Shoyebmohamad F. Shaikh
{"title":"New stable rare earth Ti-based semiconductor pyrochlore oxides for low-cost energy applications","authors":"Zeesham Abbas,&nbsp;Kisa Fatima,&nbsp;Adeela Naz,&nbsp;Amna Parveen,&nbsp;Shoyebmohamad F. Shaikh","doi":"10.1007/s10853-024-10149-x","DOIUrl":"10.1007/s10853-024-10149-x","url":null,"abstract":"<div><p>This study investigates the structural, optoelectronic, magnetic and thermophysical properties of three newly designed semiconductor pyrochlore oxides, namely RE<sub>2</sub>Ti<sub>2</sub>O<sub>7</sub> (RE = Er, Eu, Tb), using ab-initio calculations within the density functional theory framework. The values of indirect bandgaps are 3.8, 2.2 and 3.77 eV for the spin up channel of Er<sub>2</sub>Ti<sub>2</sub>O<sub>7</sub>, Eu<sub>2</sub>Ti<sub>2</sub>O<sub>7</sub>, and Tb<sub>2</sub>Ti<sub>2</sub>O<sub>7</sub>, respectively. While the values of indirect bandgaps for the spin down channel of Er<sub>2</sub>Ti<sub>2</sub>O<sub>7</sub>, Eu<sub>2</sub>Ti<sub>2</sub>O<sub>7</sub>, and Tb<sub>2</sub>Ti<sub>2</sub>O<sub>7</sub> are 3.56, 3.65 and 2.1 eV, respectively. The paramagnetic magnetic moments can be inferred by analyzing the distinct band shapes observed in the energy band structures of the studied compounds corresponding to the spin up and spin down states. The magnetic moments of Er<sub>2</sub>Ti<sub>2</sub>O<sub>7</sub>, Eu<sub>2</sub>Ti<sub>2</sub>O<sub>7</sub>, and Tb<sub>2</sub>Ti<sub>2</sub>O<sub>7</sub> have significant magnitudes, specifically measuring 12.00, 24.51, and 24.00 <span>({mu }_{B})</span>, respectively. Significant absorption of incident photons by the studied compounds can be noted in near UV region in both spin channels. Low reflectivity (~ 30%) by RE<sub>2</sub>Ti<sub>2</sub>O<sub>7</sub> (RE = Er, Eu, Tb) is evident from the <span>(R(omega ))</span> spectra in an energy range of 1.0–10.0 eV. However, these compounds exhibit ~ 50% reflectance of the incident photons in upper UV region (above 10.0 eV). The analysis of the Seebeck coefficient spectra reveals that RE<sub>2</sub>Ti<sub>2</sub>O<sub>7</sub> (RE = Er, Eu, Tb) exhibits <i>p</i>-type semiconductor behavior, however, Eu<sub>2</sub>Ti<sub>2</sub>O<sub>7</sub> also shows <i>n</i>-type behavior from 200 to 450 K. The presented thermodynamic characteristics reveal that the pyrochlore oxides RE<sub>2</sub>Ti<sub>2</sub>O<sub>7</sub> (RE = Er, Eu, Tb) exhibit thermal stability.</p></div>","PeriodicalId":645,"journal":{"name":"Journal of Materials Science","volume":"59 41","pages":"19558 - 19583"},"PeriodicalIF":3.5,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142565940","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A novel building thermal energy storage PCM: lauric acid-palmitic acid- tetradecyl alcohol/vitrified beads 新型建筑热能储存 PCM:月桂酸-棕榈酸-十四烷基醇/玻璃化微珠
IF 3.5 3区 材料科学
Journal of Materials Science Pub Date : 2024-10-21 DOI: 10.1007/s10853-024-10316-0
Qiuhui Yan, Mengyu Jia, Jieren Luo, Xinlei Zhang, Zeyu Meng
{"title":"A novel building thermal energy storage PCM: lauric acid-palmitic acid- tetradecyl alcohol/vitrified beads","authors":"Qiuhui Yan,&nbsp;Mengyu Jia,&nbsp;Jieren Luo,&nbsp;Xinlei Zhang,&nbsp;Zeyu Meng","doi":"10.1007/s10853-024-10316-0","DOIUrl":"10.1007/s10853-024-10316-0","url":null,"abstract":"<div><p>In order to obtain a building thermal storage material with excellent thermal performance, sufficient strength and low leakage, the advantages of ternary PCMs (Lauric acid—Palmitic acid—Tetradecyl alcohol, LA-PA-TA) and vitrified beads (VB) as a adsorbent carrier were integrated to prepare a novel LA-PA-TA/VB composite PCM which exhibited favorable phase change temperature (i.e. 20.1–20.5°C) and low sub-cooling (0.4°C). Then, the novel LA-PA-TA/VB was, respectively, encapsulated with five different materials (a true stone paint emulsion, styrene-acrylic emulsion, EVA emulsion, epoxy resin and cement powder) to form a shape-stabilized LA-PA-TA/VB (SS-LA-PA-TA/VB) in order to reduce the leakage. The mass loss and mechanical properties experiments showed that SS-LA-PA-TA/VB encapsulated with the real stone paint emulsion-cement powder presented the optimal stability and reliability with low mass loss ratio of only 2.67% after 50 phase change cycles. The SS-LA-PA-TA/VB with the optimal package was further prepared into a thermal energy storage mortar (TESM) with different SS-LA-PA-TA/VB contents. The results show that the thermal properties of the TESM increased and the mechanical properties decreased with SS-LA-PA-TA/VB contents. However, even with the TESM with 30 wt% SS-LA-PA-TA/VB (30TESM), the compressive strength, flexural strength etc. still satisfy the requirement of the Chinese National Standard. The analysis shows that the hydrophobic functional groups are attached to the surface of the emulsion of the real stone paint, whereby a stable hydrophobic film was formed. In addition, the temperature regular ability and heat insulation performance of 30TESM and the referenced mortar were compared by temperature probe embedded inside the mortar blocks and installed in a small experimental room. The results indicated that the internal temperature of the mortar blocks, backside and central temperature in the small room was 5.4°C,5.6°C and 2.1°C lower than those of the referenced group, respectively. It is thus clear that the novel low cost TESM exhibits a good temperature damping effect and temperature control performance and may have a widespread application in the areas of building energy conservation.</p></div>","PeriodicalId":645,"journal":{"name":"Journal of Materials Science","volume":"59 41","pages":"19734 - 19751"},"PeriodicalIF":3.5,"publicationDate":"2024-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142565934","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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