E-journal of Surface Science and Nanotechnology最新文献_第4页

Preface for the Special Issue of ALC’22 ALC'22 特刊序言

IF 0.7

E-journal of Surface Science and Nanotechnology Pub Date : 2023-12-07 DOI: 10.1380/ejssnt.2023-069

H. Shigekawa, Hiroshi Daimon, Hiroki Hibino

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Emerging Trends of Nanotechnology-Based Advanced Cosmeceuticals 基于纳米技术的高级药用化妆品的新趋势

IF 0.7

E-journal of Surface Science and Nanotechnology Pub Date : 2023-12-02 DOI: 10.1380/ejssnt.2023-068

U. Awan, R. Saeed, Hammad Ismail, Sheikh Zain Ul Abidin, Joham Sarfraz Ali, Muhammad Zeeshan Bhatti

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Surface Facet Effect on the Adsorption of Iodine and Astatine on Gold Surface 表面小面效应对金表面碘和砹吸附的影响

E-journal of Surface Science and Nanotechnology Pub Date : 2023-10-19 DOI: 10.1380/ejssnt.2023-067

Jeffrey Tanudji, Susan M. Aspera, Hideaki Kasai, Michio Okada, Tetsuo Ogawa, Hiroshi Nakanishi

{"title":"Surface Facet Effect on the Adsorption of Iodine and Astatine on Gold Surface","authors":"Jeffrey Tanudji, Susan M. Aspera, Hideaki Kasai, Michio Okada, Tetsuo Ogawa, Hiroshi Nakanishi","doi":"10.1380/ejssnt.2023-067","DOIUrl":"https://doi.org/10.1380/ejssnt.2023-067","url":null,"abstract":"We have performed first principles calculation study based on density functional theory on the adsorption of iodine and astatine on Au(111) and Au(211), including spin-orbit coupling (SOC) effects in some calculations. These surfaces are the dominant surface termination to represent a face-centered cubic nanoparticle. We found that both iodine and astatine adsorb stronger on the edge-bridge site of the Au(211) surface than on the flat Au(111) surface by about 0.2 eV. This result also makes the adsorbate less likely to diffuse after adsorption on the (211) surface as compared to the (111) surface. Additionally, we found that SOC effects, usually a necessity when considering heavy elements, are not significant in these cases, as can be seen by the energy and geometric data. Finally, we found the difference in adsorption energy between iodine and astatine on gold surface can be expected due to the presence of 4f electrons in astatine, which is not present in iodine. The 4f electrons offer less shielding of the nucleus, making the valence electrons of astatine closer to the nucleus, and therefore a smaller atomic radius. This information is useful both for experimental verification and future developments of gold nanoparticles for radiotherapy.","PeriodicalId":11626,"journal":{"name":"E-journal of Surface Science and Nanotechnology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135666863","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Development of a Photoemission Microscopy Apparatus Using a Vacuum Ultraviolet Laser 真空紫外激光器光发射显微装置的研制

E-journal of Surface Science and Nanotechnology Pub Date : 2023-10-12 DOI: 10.1380/ejssnt.2023-066

Koichiro Yaji, Shunsuke Tsuda

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Detection of Surface Modification of Polyimide Containing Steroidal Structure as a Function of Storage Time Using Second-Order Nonlinear Optical Spectroscopy 用二阶非线性光谱学检测含甾体结构聚酰亚胺表面改性随贮存时间的变化

E-journal of Surface Science and Nanotechnology Pub Date : 2023-10-05 DOI: 10.1380/ejssnt.2023-065

Trinh Thi Nguyen, Wentao Du, Hien Thi Thu Khuat, Goro Mizutani

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3D-Printed Beam Window for J-PARC COMET Project J-PARC彗星项目的3d打印光束窗口

E-journal of Surface Science and Nanotechnology Pub Date : 2023-09-21 DOI: 10.1380/ejssnt.2023-064

Hiroyuki Shidara, Shunsuke Makimura, Yoshinori Fukao, Yutaka Nagasawa, Masahiro Onoi, Hiroaki Kurishita, Naoya Kamei

{"title":"3D-Printed Beam Window for J-PARC COMET Project","authors":"Hiroyuki Shidara, Shunsuke Makimura, Yoshinori Fukao, Yutaka Nagasawa, Masahiro Onoi, Hiroaki Kurishita, Naoya Kamei","doi":"10.1380/ejssnt.2023-064","DOIUrl":"https://doi.org/10.1380/ejssnt.2023-064","url":null,"abstract":"We have developed the beam windows for the COherent Muon to Electron Transition (COMET) project. The COMET project is under construction at the proton beam accelerator facility J-PARC in Japan. Windows are one of key components on the beam line. The beam window should pass the beam of proton or other particles effectively, with robustly separating sections of the beam line. After research and developments for the beam windows especially focused on the shape and structure, we employed a dome shape which has radius curvature(s) on to the beam passing area, instead of a conventional thin and flat shape. Additionally, we employed a thicker structure on the circumference part to give higher mechanical strength. To manufacture cost consciously, the beam windows are fabricated by a three-dimensional printer, additive manufacturing (AM) to realize a hard to cut and machine shape. The detailed dimensions were designed through numerical analysis. There are requirements of high transmission efficiency of the beam, such as the material density must be low, and the thickness must be as thin as possible, while minimizing the nuclear heat generation by beam energy loss. Thus, the material was chosen as titanium alloy, Ti-6Al-4V. After the window shape was formed by AM, the voids inside the window were killed by hot isostatic pressing. Finally the window was polished to be smoothen the surface and tailored its thickness. As the first step to be used for the COMET project, for Phase-α we fabricated domes of 270 and 220 mm to mate with the rotatable flanges. The target values of the dome were the thickness tailored below 0.5 mm, and the pressure withstanding performance over 0.8 MPa for each diameter model. Throughout the tests we confirmed that the windows satisfied the target values, and the windows could withstand 0.9 MPa when pressurized from concave side of the dome.","PeriodicalId":11626,"journal":{"name":"E-journal of Surface Science and Nanotechnology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136129648","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Atomic and Electronic Structures on a Mordenite Zeolite 丝光沸石的原子和电子结构

E-journal of Surface Science and Nanotechnology Pub Date : 2023-09-21 DOI: 10.1380/ejssnt.2023-063

Shinya Hosokawa, Hitoshi Sato, Yasuhisa Tezuka, Jun-ichi Adachi, Koji Kimura, Koichi Hayashi, Shinji Kohara, Hiroo Tajiri, Kentaro Kobayashi, Akihide Koura, Fuyuki Shimojo

{"title":"Atomic and Electronic Structures on a Mordenite Zeolite","authors":"Shinya Hosokawa, Hitoshi Sato, Yasuhisa Tezuka, Jun-ichi Adachi, Koji Kimura, Koichi Hayashi, Shinji Kohara, Hiroo Tajiri, Kentaro Kobayashi, Akihide Koura, Fuyuki Shimojo","doi":"10.1380/ejssnt.2023-063","DOIUrl":"https://doi.org/10.1380/ejssnt.2023-063","url":null,"abstract":"Atomic structures of an insulating and hydrophobic zeolite sample of mordenite were measured by high-energy X-ray diffraction, and a pair distribution function analysis was carried out. Valence- and conduction-band O 2p partial densities of states (DOSs) in a mordenite were measured by soft X-ray emission and absorption spectroscopies (SXES and SXAS), respectively. The SXAS spectrum for the conduction band O 2p orbital has characteristic structures like that of crystalline SiO2, while pre-shoulders are observed in mordenite. By choosing characteristic energies in the SXAS spectrum for the incident photon energies, SXES spectra were obtained, in which a large peak and three small peaks or shoulders can be assigned by a lone pair orbital and bonding (σ) ones, respectively. A density functional theory was applied to determine the exact atomic structures and electronic states, and they are in good agreement with the corresponding experiments. It is concluded that the O 2p partial DOS is mainly O-Si covalent bonds, and the Al and Na atoms have minor contributions for them. From this study, it was found that the fundamental properties of complex zeolites can only be obtained in combination of experimental and theoretical investigations as mentioned above, which can open feasibilities to uncover the origin of active sites in functional zeolites.","PeriodicalId":11626,"journal":{"name":"E-journal of Surface Science and Nanotechnology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136129647","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

DFT Study of Bowtie Shaped Nanographene 领结型纳米石墨烯的DFT研究

E-journal of Surface Science and Nanotechnology Pub Date : 2023-09-16 DOI: 10.1380/ejssnt.2023-060

Reo Iida, Shoichi Sakamoto, Mitsuyoshi Tomiya

引用次数: 0

Nano-scale Interaction of Chloromethane (CH<sub>3</sub>Cl) with the Fe(110) Surface; A van der Waals Calculation 氯甲烷(CH<sub>3</sub>Cl)与Fe(110)表面的纳米级相互作用范德华计算

E-journal of Surface Science and Nanotechnology Pub Date : 2023-09-16 DOI: 10.1380/ejssnt.2023-062

Sherin A. Saraireh

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Design Optimization of High Breakdown Voltage AlGaN/GaN High Electron Mobility Transistor with Insulator Dielectric Passivation Layer 具有绝缘体介质钝化层的高击穿电压AlGaN/GaN高电子迁移率晶体管的设计优化

E-journal of Surface Science and Nanotechnology Pub Date : 2023-09-16 DOI: 10.1380/ejssnt.2023-061

Phuc Hong Than, Tho Quang Than

{"title":"Design Optimization of High Breakdown Voltage AlGaN/GaN High Electron Mobility Transistor with Insulator Dielectric Passivation Layer","authors":"Phuc Hong Than, Tho Quang Than","doi":"10.1380/ejssnt.2023-061","DOIUrl":"https://doi.org/10.1380/ejssnt.2023-061","url":null,"abstract":"AlGaN/GaN high electron mobility transistors (HEMTs) possess favorable material properties and are compatible with large-scale manufacturing, making them promising as a next-generation power device. However, there is a lack of information available on the effect of an insulator dielectric passivation layer on the breakdown voltage (Vbr) of AlGaN/GaN HEMTs. This study utilizes technology computer aided design to investigate the impact of different insulator dielectric passivation layers, such as SiO2, SiN, Al2O3, and HfO2, on Vbr of AlGaN/GaN HEMTs. Furthermore, the study optimizes the parameters of the field plate length (LFP) and insulator thickness to maximize Vbr of AlGaN/GaN HEMTs. Results indicate that HEMTs with a field plate (FP-HEMTs) have greater Vbr than HEMTs without a field plate (N-HEMTs). With the optimized conditions of a 1.8 µm LFP and a 0.95 µm insulator thickness with HfO2 passivation, Vbr of 1120 V is achieved. The findings suggest that the field plate (FP) and passivation layer can significantly improve the efficiency and reliability of AlGaN/GaN HEMTs while the impact of AlGaN/GaN heterostructure parameters on Vbr is minimal.","PeriodicalId":11626,"journal":{"name":"E-journal of Surface Science and Nanotechnology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2023-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135305556","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