Vacuum最新文献 - Book学术

Stress and temperature effects on corrosion behavior of BCC iron in liquid lead-bismuth eutectic: molecular dynamics and first-principles study 应力和温度对液态铅铋共晶中BCC铁腐蚀行为的影响：分子动力学和第一性原理研究

IF 3.8 2区材料科学

Vacuum Pub Date : 2025-05-27 DOI: 10.1016/j.vacuum.2025.114454

Liming Chen , Jintao Zhang , Bingsheng Li

{"title":"Stress and temperature effects on corrosion behavior of BCC iron in liquid lead-bismuth eutectic: molecular dynamics and first-principles study","authors":"Liming Chen , Jintao Zhang , Bingsheng Li","doi":"10.1016/j.vacuum.2025.114454","DOIUrl":"10.1016/j.vacuum.2025.114454","url":null,"abstract":"<div><div>In nuclear reactors, the stress in structural materials significantly affects their performance and structural integrity under high temperatures, corrosive coolants, and irradiation environments. In this work, we employed molecular dynamics simulations to investigate the dissolution corrosion behavior of stressed body-centered cubic iron (BCC-Fe) bulk in contact with liquid lead-bismuth eutectic (LBE) at high temperatures (623–973 K) under one atmospheric pressure. Additionally, we analyzed the stress corrosion mechanism in detail, based on the adsorption energy, substitution energy, escape energy, and surface energy calculated from first-principles calculations and Embedded Atom Method (EAM) potential. At 973 K, the surface energy of the BCC-Fe bulk is −0.2 J/m<sup>2</sup> at 10 % strain, compared to 1.52 J/m<sup>2</sup> without stress. It has been shown that stress significantly reduces the surface energy. Furthermore, stress accelerates the penetration of liquid LBE into BCC-Fe bulk, thereby exacerbating its dissolution corrosion. These findings provide new insights into the mechanisms of stress corrosion and offer valuable guidance for experimental research in nuclear reactors.</div></div>","PeriodicalId":23559,"journal":{"name":"Vacuum","volume":"239 ","pages":"Article 114454"},"PeriodicalIF":3.8,"publicationDate":"2025-05-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144168045","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Airflow diagnostics of HEK-X expansion tube flows using multi-pass laser absorption spectroscopy installed in the test chamber 利用安装在测试室内的多通激光吸收光谱对HEK-X膨胀管流动进行气流诊断

IF 3.8 2区材料科学

Vacuum Pub Date : 2025-05-26 DOI: 10.1016/j.vacuum.2025.114448

Hayato Nogami , Hotaka Matsumoto , Makoto Matsui , Shuto Yatsuyanagi , Hideyuki Tanno

引用次数: 0

High-rate deposition of ultrathick bismuth films by direct-current magnetron sputtering 直流磁控溅射制备超厚铋薄膜

IF 3.8 2区材料科学

Vacuum Pub Date : 2025-05-26 DOI: 10.1016/j.vacuum.2025.114385

D.C. Goodelman, G.V. Taylor, E. Kim, M.J. Stafford, D.X. Qu, A. Pendse, S.J. Shin, S.O. Kucheyev, L.B. Bayu Aji

引用次数: 0

Synergistic regulation of TiO2 band structure by Nd and Bi for efficient photocatalytic degradation of ciprofloxacin Nd和Bi对TiO2带结构的协同调控对环丙沙星的有效光催化降解

IF 3.8 2区材料科学

Vacuum Pub Date : 2025-05-25 DOI: 10.1016/j.vacuum.2025.114442

Tingting Zhang , Di Meng , Gala Sa, Aiju Xu

{"title":"Synergistic regulation of TiO2 band structure by Nd and Bi for efficient photocatalytic degradation of ciprofloxacin","authors":"Tingting Zhang , Di Meng , Gala Sa, Aiju Xu","doi":"10.1016/j.vacuum.2025.114442","DOIUrl":"10.1016/j.vacuum.2025.114442","url":null,"abstract":"<div><div>Ciprofloxacin (CIP) is a broad-spectrum antibiotic commonly utilized for treating various bacterial infections. Owing to its widespread overuse, CIP is increasingly being identified as an emerging environmental pollutant in various water systems. CIP poses severe ecological risks due to its high toxicity. The inability of traditional water treatment processes to effectively degrade CIP has resulted in its widespread accumulation in wastewater, creating substantial threats to water quality and the health of humans. Photocatalysis has emerged as a successful technique for wastewater treatment of organic contaminants due to its environmental friendliness and stability. As a widely used photocatalyst, titanium dioxide (TiO<sub>2</sub>) has garnered significant attention due to sustained catalytic activity and photon utilization rate. However, because of its large band gap, light can only be absorbed in the UV spectrum, which limits its wider use. Get through these restrictions, the energy band structure of TiO<sub>2</sub> was regulated by doping with Nd and Bi, aiming to achieve efficient degradation of ciprofloxacin. TiO<sub>2</sub>, Bi-TiO<sub>2</sub> and Nd-Bi-TiO<sub>2</sub> were synthesized by a one-step hydrothermal method, and their methodical investigation of ciprofloxacin (CIP) photocatalytic degradation. The results indicate that the co-doping of Nd and Bi in appropriate amounts alters the structure of TiO<sub>2</sub>, notably enhances the specific surface area and photocurrent response, and reduces the band gap width. When the doping amounts of Nd and Bi are 0.5 % and the catalyst dosage is 15 mg. Within 100 min, the CIP photodegradation rate rises from 84.45 % to 100.00 %. According to the first-order reaction kinetics fitting, its rate constant was obtained as 0.0533. A mechanism for the photocatalytic degradation of CIP by Nd/Bi doped TiO<sub>2</sub> was proposed.</div></div>","PeriodicalId":23559,"journal":{"name":"Vacuum","volume":"239 ","pages":"Article 114442"},"PeriodicalIF":3.8,"publicationDate":"2025-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144138919","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Interfacial enhancement of laser welded joint between Ti-6Al-4V and CFRTP by pre-constructing composite deposition layer 预构建复合沉积层增强Ti-6Al-4V与CFRTP激光焊接接头界面

IF 3.8 2区材料科学

Vacuum Pub Date : 2025-05-23 DOI: 10.1016/j.vacuum.2025.114450

Pengyuan Zou , Lixi Tian , Shanling Wang , Chenshan Wu , Rui Zhou

引用次数: 0

Study on recycling of ZM6 rare-earth magnesium alloy scrap by vacuum sublimation gasification 真空升华气化法回收ZM6稀土镁合金废料的研究

IF 3.8 2区材料科学

Vacuum Pub Date : 2025-05-23 DOI: 10.1016/j.vacuum.2025.114446

Lipeng Wang , Meng Wang , Dong Liang , Yang Tian , Bin Yang , Baoqiang Xu , Wenlong Jiang , Fei Wang

{"title":"Study on recycling of ZM6 rare-earth magnesium alloy scrap by vacuum sublimation gasification","authors":"Lipeng Wang , Meng Wang , Dong Liang , Yang Tian , Bin Yang , Baoqiang Xu , Wenlong Jiang , Fei Wang","doi":"10.1016/j.vacuum.2025.114446","DOIUrl":"10.1016/j.vacuum.2025.114446","url":null,"abstract":"<div><div>Magnesium (Mg) alloys have great potential for lightweight use and are widely applied in automotive industry. Rare earth magnesium (RE-Mg) alloys, enhanced with rare earth (RE) elements, and their superior properties enable their expanded application in key aerospace components. However, the stringent requirements in aerospace applications lead to lower production yields, inevitably generating a significant amount of RE-containing Mg alloy scrap. Traditional recycling methods risk environmental harm and loss of valuable RE elements. This study proposes a vacuum sublimation gasification process for recycling Mg and neodymium (Nd) from ZM6 RE magnesium alloy. Through thermodynamic analysis, the feasibility of separating and recycling Mg and Nd was evaluated, along with its separation capacity, and the content and behavior of elements in the gas phase were predicted. Experimental results confirm that vacuum sublimation gasification is thermodynamically viable. Under optimal gasification conditions—pressure of 10 Pa, gasification temperature of 750 °C, and holding time of 120 min—recycled Mg with a purity of 99.936 wt% and Nd with a purity of 83.84 wt% were obtained. This research provides novel ideas and guidance for enhancing the sustainable circulation of Mg and maximizing the utilization of RE resources.</div></div>","PeriodicalId":23559,"journal":{"name":"Vacuum","volume":"239 ","pages":"Article 114446"},"PeriodicalIF":3.8,"publicationDate":"2025-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144147614","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

An ultra-sensitive triethylamine sensor based on WO3 modified ErVO4 nanoparticles 基于WO3修饰ErVO4纳米颗粒的超灵敏三乙胺传感器

IF 3.8 2区材料科学

Vacuum Pub Date : 2025-05-23 DOI: 10.1016/j.vacuum.2025.114440

Yuxiang Zhao, Shijie Lu, Minyuan Lv, Jinye Liu, Yue Chen, Yijia Wang, Hui Zhou, Xiaoxuan Che, Baozhong Kang, Qianqian Zhang

{"title":"An ultra-sensitive triethylamine sensor based on WO3 modified ErVO4 nanoparticles","authors":"Yuxiang Zhao, Shijie Lu, Minyuan Lv, Jinye Liu, Yue Chen, Yijia Wang, Hui Zhou, Xiaoxuan Che, Baozhong Kang, Qianqian Zhang","doi":"10.1016/j.vacuum.2025.114440","DOIUrl":"10.1016/j.vacuum.2025.114440","url":null,"abstract":"<div><div>ErVO<sub>4</sub>/WO<sub>3</sub> composites, which exhibit superior selectivity towards triethylamine, were synthesized through a combination of electrospinning and a straightforward hydrothermal method. In comparison with traditional gas sensors, the optimal operating temperature of this sensor is significantly decreased; it is merely 200 °C. When contrasted with the ErVO<sub>4</sub> sensor, the ErVO<sub>4</sub>/WO<sub>3</sub> sensor manifested a substantial improvement in key performance indicators, such as gas - sensing response, detection limit, stability, and desorption time. At the optimal temperature of 200 °C, the ErVO<sub>4</sub>/WO<sub>3</sub> composite displayed a response of 15.79 to triethylamine gas at a concentration of 100 ppm. More significantly, while the stability of this sensor has been considerably enhanced, its desorption time has been shortened by 32 s as compared to that of the pure ErVO<sub>4</sub> sensor. The marked reduction in the recovery time endows it with extremely broad application prospects within the realm of industrial applications. X - ray powder diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV–VIS ab-sorption spectra, ultraviolet photo-electron spectroscopy (UPS), and X - ray photoelectron spectroscopy (XPS) were utilized to examine the microstructure and elemental composition. The results indicated that the composite formulation of ErVO<sub>4</sub> and WO<sub>3</sub> represents an effective approach to enhancing the sensing performance of triethylamine. This composite demonstrated significant potential for the fabrication of triethylamine sensors characterized by high sensitivity, robust stability, and a low detection limit. This work provides a crucial reference and research direction for the advancement of sensor technology in relevant fields.</div></div>","PeriodicalId":23559,"journal":{"name":"Vacuum","volume":"239 ","pages":"Article 114440"},"PeriodicalIF":3.8,"publicationDate":"2025-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144138921","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Laser-driven shock wave dynamics in aluminum target 激光驱动铝靶的激波动力学

IF 3.8 2区材料科学

Vacuum Pub Date : 2025-05-23 DOI: 10.1016/j.vacuum.2025.114403

Ahmad Raza , Zia Ur Rehman , Sultan Mahmood , Saad abdullah Makhdoom , Sajjad Tahir , Hamza Qayyum , Shakir Ullah

{"title":"Laser-driven shock wave dynamics in aluminum target","authors":"Ahmad Raza , Zia Ur Rehman , Sultan Mahmood , Saad abdullah Makhdoom , Sajjad Tahir , Hamza Qayyum , Shakir Ullah","doi":"10.1016/j.vacuum.2025.114403","DOIUrl":"10.1016/j.vacuum.2025.114403","url":null,"abstract":"<div><div>This study investigates the dynamics of plasma and shock wave generated during nanosecond laser ablation of the aluminum target over a broad range of laser fluence (15-700 J/cm<span><math><msup><mrow></mrow><mrow><mn>2</mn></mrow></msup></math></span>). The optical probe beam deflection apparatus coupled with laser-induced breakdown spectroscopy is applied to track and elucidate the evolution of laser-induced plasma and shock waves. Our findings reveal a rapid increase in shock wave velocity and pressure with increasing fluence, reaching a maximum of 4 km/s and 100 MPa at 350 J/cm<span><math><msup><mrow></mrow><mrow><mn>2</mn></mrow></msup></math></span>, followed by saturation at higher fluences. These findings align well with the CJ detonation velocity model and Fabbero’s model for laser ablation dynamics. The study also highlights the rapid decay of shock wave’s velocity and pressure in the near-field region, adhering to the Sadowski and blast wave model and approaching typical acoustic waves within a few mm of the target surface. Plasma temperature and electron density peaked at 350 J/cm<span><math><msup><mrow></mrow><mrow><mn>2</mn></mrow></msup></math></span>, confirming the effect of the reflection of the trailing laser pulse by the induced plasma. Our study revealed a direct relationship between SW pressure and ablated mass, resulting in a constant mass-specific shock wave pressure that increases linearly with laser fluence and remains constant beyond 350 J/cm<span><math><msup><mrow></mrow><mrow><mn>2</mn></mrow></msup></math></span>. The laser-induced breakdown spectroscopy analysis also uncovered a significant decrease in the electron number density and plasma temperature with time, following a power-law relationship. These insights enhance understanding of the underlying physics of laser-induced shock wave, paving the way for material processing and micromachining applications.</div></div>","PeriodicalId":23559,"journal":{"name":"Vacuum","volume":"239 ","pages":"Article 114403"},"PeriodicalIF":3.8,"publicationDate":"2025-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144130811","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Correlation between electrical and structural changes in amorphous ITO films 非晶ITO薄膜中电学和结构变化的相关性

IF 3.8 2区材料科学

Vacuum Pub Date : 2025-05-23 DOI: 10.1016/j.vacuum.2025.114441

Seonghoon Han , Yeongjun Son , Sehwan Song , Jisung Lee , Jong-Seong Bae , Anh Tuan Thanh Pham , Thang Bach Phan , Jeong Hwan Kim , Jong Mok Ok , Dooyong Lee , Sungkyun Park

{"title":"Correlation between electrical and structural changes in amorphous ITO films","authors":"Seonghoon Han , Yeongjun Son , Sehwan Song , Jisung Lee , Jong-Seong Bae , Anh Tuan Thanh Pham , Thang Bach Phan , Jeong Hwan Kim , Jong Mok Ok , Dooyong Lee , Sungkyun Park","doi":"10.1016/j.vacuum.2025.114441","DOIUrl":"10.1016/j.vacuum.2025.114441","url":null,"abstract":"<div><div>We investigated the temperature-dependent resistance, structural properties, and chemical state of amorphous ITO film during annealing under vacuum using <em>in-situ</em> analyses. <em>In-situ</em> resistance measurement revealed a sharp increase in resistance, reaching a maximum at approximately 180 °C and decreasing with a further increase in annealing temperature. <em>In-situ</em> X-ray diffraction confirmed the onset of crystallization of the amorphous ITO film at the temperature where the resistivity increased sharply. From the <em>in-situ</em> XPS analysis, we found no change in chemical states, such as oxygen vacancy or the formation of Sn<sup>4+</sup>. In the Hall effect measurement, we confirmed a significant decrease in mobility at the ITO film annealed in vacuum at 175 °C. This indicates the grain boundaries formed by the crystallization of ITO increase the electron scattering, causing a sharp increase in resistance at 180 °C. Our findings suggest that structural changes primarily drove the change in electrical properties of amorphous ITO during annealing. This study highlights the importance of real-time monitoring in understanding the dynamic change in ITO film and provides a comprehensive understanding of the structural and electrical transitions during crystallization.</div></div>","PeriodicalId":23559,"journal":{"name":"Vacuum","volume":"239 ","pages":"Article 114441"},"PeriodicalIF":3.8,"publicationDate":"2025-05-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144138922","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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

Salt-assisted promotion of large dimensional growth of Bi2O2Se 盐辅助促进Bi2O2Se的大尺寸生长

IF 3.8 2区材料科学

Vacuum Pub Date : 2025-05-21 DOI: 10.1016/j.vacuum.2025.114426

Pingfan Ning , Xiangyu Li , Feifei Lan , Xuerong Li , Yingmin Wang , Hongjuan Cheng , Yujian Wang

引用次数: 0