Crystals最新文献_第4页

Simple Nickel Foam Modification Procedures for Enhanced Ni Foam Supercapacitor Applications 用于增强镍泡沫超级电容器应用的简单镍泡沫改性程序

IF 2.7 4区材料科学

Crystals Pub Date : 2024-08-31 DOI: 10.3390/cryst14090777

Bogusław Pierożyński, Mateusz Kuczyński, Tomasz Mikołajczyk

引用次数: 0

Ab Initio Study of the Crystalline Structure of HgS under Low and High Pressure 低压和高压下 HgS 晶体结构的 Ab Initio 研究

IF 2.7 4区材料科学

Crystals Pub Date : 2024-08-31 DOI: 10.3390/cryst14090780

Ahmed Amine Aidouni, Abdelkader Aissat, Mounir Ould-Mohamed, Mohamed El Amine Benamar, Samuel Dupont, Jean Pierre Vilcot

引用次数: 0

Environmental and Energy Applications of Graphene-Based Nanocomposites: A Brief Review 石墨烯基纳米复合材料的环境和能源应用：简评

IF 2.7 4区材料科学

Crystals Pub Date : 2024-08-31 DOI: 10.3390/cryst14090781

N. V. Krishna Prasad, K. Chandra Babu Naidu, D. Baba Basha

{"title":"Environmental and Energy Applications of Graphene-Based Nanocomposites: A Brief Review","authors":"N. V. Krishna Prasad, K. Chandra Babu Naidu, D. Baba Basha","doi":"10.3390/cryst14090781","DOIUrl":"https://doi.org/10.3390/cryst14090781","url":null,"abstract":"Chemically stable two-dimensional nanostructured graphene with huge surface area, high electrical conductivity and mechanical excellence has gained significant research attention in the past two decades. Its excellent characteristics make graphene one of the important materials in various applications such as environmental and energy storage devices. Graphene no doubt has been a top priority among the carbon nanomaterials owing to its structure and properties. However, the functionalization of graphene leads to various nanocomposites where its properties are tailored to be suited for various applications with more performance, environmental friendliness, efficiency, durability and cost effectiveness. Graphene nanocomposites are said to exhibit more surface area, conductivity, power conversion efficiency and other characteristics in energy devices like supercapacitors. This review was aimed to present some of the applications of graphene-based nanocomposites in energy conversion devices like supercapacitors and Li-ion batteries and some of the environmental applications. It was observed that the performance of supercapacitors was obstructed due to restacking and agglomeration of graphene layers. This was addressed by combining MO (metal oxide) or CP (conducting polymer) with graphene as material for electrodes. Electrodes with CP or MO/graphene composites are summarized. Heterogeneous catalysts were of environmental concern in recent years. In this context, graphene-based nanocomposites gained significance due to expansion in structural diversity. A minimum overview is presented in this paper in terms of structural aspects and properties of GO/rGO-based materials used in supercapacitors and environmental applications like dye removal. Continuous efforts towards synthesis of productive graphene-based nanocomposites might lead to significant output in applications related to environment and energy sectors.","PeriodicalId":10855,"journal":{"name":"Crystals","volume":"45 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142202519","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Going Inside a Historical Brazilian Diamond from the Spada Collection (19th Century) 走进斯帕达收藏的一颗历史悠久的巴西钻石（19 世纪）

IF 2.7 4区材料科学

Crystals Pub Date : 2024-08-31 DOI: 10.3390/cryst14090779

Giovanna Agrosì, Daniela Mele, Gioacchino Tempesta

{"title":"Going Inside a Historical Brazilian Diamond from the Spada Collection (19th Century)","authors":"Giovanna Agrosì, Daniela Mele, Gioacchino Tempesta","doi":"10.3390/cryst14090779","DOIUrl":"https://doi.org/10.3390/cryst14090779","url":null,"abstract":"The characterization of objects of historical and cultural interest represents a crucial topic, specifically when it regards gemstones. Actually, the advanced investigation of precious minerals of gemological interest requires exclusively non-destructive analyses which are also suitable for determining their provenance when it is unknown. In this study, a non-destructive analytical protocol, previously tested on diamonds for petrogenetic studies, has been applied to a natural diamond of very high historical and gemological value, donated in 1852 by Monsignor Lavinio de ‘Medici Spada to the Museum of Earth Sciences of Sapienza University (Rome). The analytical protocol used includes X-ray diffraction topography, micro-computed X-ray tomography, single-crystal micro-X-ray diffraction and Fourier-transform infrared spectroscopy. The results show the presence of dislocations originating from inclusions and a very low degree of plastic deformation. The aggregation states of its N impurities show that this diamond is type IaAB, while the inclusions consist of olivine (Fo92-93), suggesting a lithospheric origin. The historical references found in the catalogs of the Museum indicate only a Brazilian origin, without any reference to the mining district. The information acquired in this study, enhanced by document research on mining in Brazil since 1700, suggests that the diamond likely comes from the district of Diamantina, Mina Gerais, Brazil.","PeriodicalId":10855,"journal":{"name":"Crystals","volume":"07 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142202514","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Influence of the Acetylene Flow Rate and Process Pressure on the Carbon Deposition Behavior by Thermal Chemical Vapor Deposition Process 热化学气相沉积工艺中乙炔流速和工艺压力对碳沉积行为的影响

IF 2.7 4区材料科学

Crystals Pub Date : 2024-08-31 DOI: 10.3390/cryst14090782

Gi-Hoon Kwon, Byoungho Choi, Young-Kook Lee, Kyoungil Moon

引用次数: 0

Effect of High Temperature on Micro-Structure and Mechanical Properties of Fiber-Reinforced Cement-Based Composites 高温对纤维增强水泥基复合材料微观结构和力学性能的影响

IF 2.7 4区材料科学

Crystals Pub Date : 2024-08-31 DOI: 10.3390/cryst14090778

Chen Ge, Xiaoliang Chen, Yongfan Gong, Xijun Kong, Fei Chen

{"title":"Effect of High Temperature on Micro-Structure and Mechanical Properties of Fiber-Reinforced Cement-Based Composites","authors":"Chen Ge, Xiaoliang Chen, Yongfan Gong, Xijun Kong, Fei Chen","doi":"10.3390/cryst14090778","DOIUrl":"https://doi.org/10.3390/cryst14090778","url":null,"abstract":"Synthetic fibers can effectively inhibit the formation and propagation of micro-cracks in concrete, significantly reducing the number and scale of cracks within the concrete matrix, thereby enhancing the concrete’s crack resistance and seepage prevention capabilities. In this study, two types of synthetic fibers, polyvinyl alcohol (PVA) and polypropylene (PP), were incorporated into cement mortar to investigate their microstructural evolution at elevated temperatures and their influence on the mechanical properties of the mortar. Both fibers were added at a volume content of 0.5%. The mortar samples were subjected to the following temperature conditions: 20 °C (ambient), 200 °C, 400 °C, and 500 °C. The results indicate that the synthetic fibers employed in this study improved the tensile properties of the mortar at room temperature (20 °C). This enhancement persisted up to 400 °C, beyond which, at 500 °C, the mechanical properties of the fiber-reinforced mortar deteriorated significantly. At 400 °C, the tensile strength of the PVA group increased by approximately 16% compared to the unblended fiber group (JZ) and by about 45% compared to the PP group. After treatment at 500 °C, the tensile strength of mortar specimens in the PVA group and the PP group decreased by 36.47% and 24.14%, respectively, compared with that at 20 °C. The porous structure formed due to the high-temperature ablation of the synthetic fibers contributed to relieving the internal pressure within the mortar.","PeriodicalId":10855,"journal":{"name":"Crystals","volume":"8 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142202516","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Influence of Process Parameters on Properties of Non-Reactive RF Magnetron-Sputtered Indium Tin Oxide Thin Films Used as Electrodes for Organic Light-Emitting Diodes 工艺参数对用作有机发光二极管电极的非反应性射频磁控溅射氧化铟锡薄膜特性的影响

IF 2.7 4区材料科学

Crystals Pub Date : 2024-08-30 DOI: 10.3390/cryst14090776

Claudia Diletto, Fiorita Nunziata, Salvatore Aprano, Ludovico Migliaccio, Maria Grazia Maglione, Alfredo Rubino, Paolo Tassini

引用次数: 0

A Cost-Effective Strategy to Modify the Electrical Properties of PEDOT:PSS via Femtosecond Laser Irradiation 通过飞秒激光辐照改变 PEDOT:PSS 电性能的经济高效策略

IF 2.7 4区材料科学

Crystals Pub Date : 2024-08-30 DOI: 10.3390/cryst14090775

Chi Zhang, Jiayue Zhou, Rui Han, Cheng Chen, Han Jiang, Xiaopeng Li, Yong Peng, Dasen Wang, Kehong Wang

{"title":"A Cost-Effective Strategy to Modify the Electrical Properties of PEDOT:PSS via Femtosecond Laser Irradiation","authors":"Chi Zhang, Jiayue Zhou, Rui Han, Cheng Chen, Han Jiang, Xiaopeng Li, Yong Peng, Dasen Wang, Kehong Wang","doi":"10.3390/cryst14090775","DOIUrl":"https://doi.org/10.3390/cryst14090775","url":null,"abstract":"Poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS) is a commonly used conductive polymer in organic optoelectronic devices. The conductivity and work function of the PEDOT:PSS are two important parameters that significantly determine the performance of the associated optoelectronic device. Traditionally, some solvents were doped in PEDOT:PSS solution or soaked in PEDOT:PSS film to improve its electrical conductivity, but they damaged the integrity of PEDOT:PSS and reduce the film’s work function. Herein, for the first time, we use femtosecond laser irradiation to modify the electrical conductivity and work function of PEDOT:PSS film. We proposed that the femtosecond laser irradiation could selectively remove the superficial insulative PSS, thereby improving the electrical conductivity of the film. The femtosecond laser-irradiated PEDOT:PSS film was further employed as a hole injection layer within cutting-edge perovskite light-emitting diodes (PeLEDs). A maximum luminosity of 950 cd/m2 was obtained in PeLEDs irradiated by femtosecond laser light in thin films, which is five times higher than that of the controlled device. Moreover, the external quantum efficiency of the devices was also increased from 4.6% to 6.3%. This work paved a cost-effective way to regulate the electrical properties of the PEDOT:PSS film.","PeriodicalId":10855,"journal":{"name":"Crystals","volume":"20 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142202527","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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

Cutting Force Model of Ultrasonic Elliptical Vibration-Assisted Helical Milling of SiCp/Al Composites 超声波椭圆振动辅助螺旋铣削 SiCp/Al 复合材料的切削力模型

IF 2.7 4区材料科学

Crystals Pub Date : 2024-08-30 DOI: 10.3390/cryst14090774

Ji Liu, Yunguang Zhou, Shiqi Jia, Yize Lu, Hui Zheng, Ming Li

{"title":"Cutting Force Model of Ultrasonic Elliptical Vibration-Assisted Helical Milling of SiCp/Al Composites","authors":"Ji Liu, Yunguang Zhou, Shiqi Jia, Yize Lu, Hui Zheng, Ming Li","doi":"10.3390/cryst14090774","DOIUrl":"https://doi.org/10.3390/cryst14090774","url":null,"abstract":"SiC particle-reinforced Al metal matrix (SiCp/Al) composites are more and more widely used in the aerospace field due to their excellent properties, and the realization of high-quality drilling of SiCp/Al composites has an important impact on improving the performance of parts. In this paper, ultrasonic elliptical vibration-assisted helical milling (UEVHM) is applied to the machining of SiCp/Al composites. Firstly, the kinematic analysis of UEVHM is carried out, and then the cutting force model is established, which takes into account the interaction between particles and the cutting edge, and calculates the crushing force, pressing force, and debonding force of the particles. Finally, the UEVHM tests are conducted to verify the accuracy of the model and to analyze the influence of process parameters on the cutting force. It was found that the radial and axial forces decreased by 34% and 39%, respectively, when the spindle speed was increased from 2000 r/min to 10,000 r/min; the radial and axial forces increased by 200% and 172%, respectively, when the pitch increased from 0.1 mm to 0.4 mm; and the radial and axial forces increased by 29% and 69%, respectively, when the rotational speed increased from 30 r/min to 70 r/min. The maximum error between the cutting force model and the experimental values is 19.06%, which has a good accuracy. The research content of this paper can provide some guidance for the high-quality hole-making of SiCp/Al composites.","PeriodicalId":10855,"journal":{"name":"Crystals","volume":"47 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-08-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142202521","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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 Methylxanthines on Urate Crystallization: In Vitro Models of Gout and Renal Calculi 甲基黄嘌呤对尿酸盐结晶的影响：痛风和肾结石的体外模型

IF 2.7 4区材料科学

Crystals Pub Date : 2024-08-29 DOI: 10.3390/cryst14090768

Jaume Dietrich, Felix Grases, Antonia Costa-Bauza

{"title":"Effect of Methylxanthines on Urate Crystallization: In Vitro Models of Gout and Renal Calculi","authors":"Jaume Dietrich, Felix Grases, Antonia Costa-Bauza","doi":"10.3390/cryst14090768","DOIUrl":"https://doi.org/10.3390/cryst14090768","url":null,"abstract":"Background: Common forms of pathological crystals are uric acid or urates, which are responsible for gout, urolithiasis, and other conditions. Methods: We used a kinetic–turbidimetric crystallization assay to evaluate the effect of ten specific methylxanthines on the crystallization of monosodium urate, potassium urate, and ammonium urate in conditions that mimicked urine. We also studied the effect of different levels of 7-methylxanthine in the presence of other biological compounds (albumin and hyaluronic acid) on the solubility of monosodium urate in conditions that mimicked synovial fluid. Results: The results showed that 7-methylxanthine in the range of 16.61–49.84 mg/L inhibited the crystallization of each urate when the initial urate concentration was 3 × 10−3 M (500 mg/L) and the conditions mimicked urine, and that the greatest inhibitory effect was for monosodium urate. In addition, 7-methylxanthine at a concentration of 25 mg/L totally prevented the crystallization of monosodium urate at an initial urate concentration of 2.38 × 10−3 M (400 mg/L) in conditions that mimicked synovial fluid. Moreover, at a low concentration of 7-methylxanthine, albumin and hyaluronic acid increased this inhibitory effect. Conclusions: Our in vitro results demonstrate that 7-methylxanthine inhibits the crystallization of urates in conditions that mimic synovial fluid and urine.","PeriodicalId":10855,"journal":{"name":"Crystals","volume":"11 1","pages":""},"PeriodicalIF":2.7,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142202529","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"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