Oxford open materials science最新文献_第2页

Derivation of Expressions for Interdiffusion and Intrinsic Diffusion Flux in Presence of Chemical Potential Gradient in a Multicomponent System with Composition Dependent Molar Volume 具有组分依赖摩尔体积的多组分体系中存在化学势梯度时相互扩散和本征扩散通量表达式的推导

Oxford open materials science Pub Date : 2023-01-01 DOI: 10.1093/oxfmat/itad018

Kaustubh N Kulkarni

{"title":"Derivation of Expressions for Interdiffusion and Intrinsic Diffusion Flux in Presence of Chemical Potential Gradient in a Multicomponent System with Composition Dependent Molar Volume","authors":"Kaustubh N Kulkarni","doi":"10.1093/oxfmat/itad018","DOIUrl":"https://doi.org/10.1093/oxfmat/itad018","url":null,"abstract":"Abstract It has been generally accepted and often mentioned in the text books that gradient in chemical potential of a species is the fundamental driving force for its diffusion. However, a general derivation of the interrelation between the diffusion flux of a component and chemical potential gradients in a non-ideal solution is lacking. Although there have been various studies in the literature reporting such interrelations for a binary system, they all assume constant molar volume. In a non-ideal system though molar volume changes with composition. Hence, in the present work, kinetic theory is used to derive a relation between diffusion flux and the chemical potential gradients for a multicomponent system with composition dependent molar volume. It is shown that the velocity of the marker as measured in a diffusion couple experiment should consist of the drift velocity (UN) due to change in molar volume accompanied by diffusion as well as the Kirkendall velocity caused by vacancy equilibration process. For the assumption of volume change occurring only in the direction of diffusion, the Kirkendall velocity is same as the marker velocity measured in a diffusion couple. However, if the lattice is allowed to relax in all directions, the contribution of UN to the marker velocity can be significant. This is shown to be as high as 20% for Cu in a Cu-Ni diffusion couple.","PeriodicalId":74385,"journal":{"name":"Oxford open materials science","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135910646","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

Optimized APCVD Method for Synthesis of Monolayer H-Phase VS2 Crystals 优化的APCVD法合成单层h相VS2晶体

Oxford open materials science Pub Date : 2023-01-01 DOI: 10.1093/oxfmat/itad020

Amit Kumar Patel, Ashish Jyoti Borah, Anchal Srivastava

{"title":"Optimized APCVD Method for Synthesis of Monolayer H-Phase VS2 Crystals","authors":"Amit Kumar Patel, Ashish Jyoti Borah, Anchal Srivastava","doi":"10.1093/oxfmat/itad020","DOIUrl":"https://doi.org/10.1093/oxfmat/itad020","url":null,"abstract":"Abstract Monolayer transition metal dichalcogenides, specifically H-phase vanadium disulfide (VS2), hold great significance as fundamental components for next-generation low-dimensional spintronic, optoelectronic, and future electronic devices. They also offer an opportunity to explore the intrinsic magnetic properties associated with monolayer H-phase VS2 crystals at room temperature. However, there have been limited experimental studies on synthesizing pure monolayer H-phase VS2 crystals using sodium metavanadate (NaVO3) and sulfur (S) as precursors for vanadium (V) and S, respectively. In this study, we present a facile atmospheric pressure chemical vapor deposition (APCVD) approach for the synthesizing monolayer H-phase VS2 crystals with a thickness of ∼0.7 nm. The lateral dimensions of monolayer VS2 crystals extends up to ∼26 µm. Additionally, we have modulated the growth parameters, such as the temperature of NaVO3 and the Ar gas flow rate, to obtain VS2 flakes with different sizes and morphologies. This significant advancement paves the way for the synthesis of monolayer H-phase VS2 crystals on SiO2/Si substrates using the APCVD technique.","PeriodicalId":74385,"journal":{"name":"Oxford open materials science","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135559577","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

Textile Architecture for Composite Materials: Back to Basics 复合材料的纺织建筑:回归基础

Oxford open materials science Pub Date : 2023-01-01 DOI: 10.1093/oxfmat/itad017

Amit Rawal, Abhijit Majumdar, Vijay Kumar

引用次数: 0

Investigating the Influence of PVDF Binder Crystallinity on the Performance of LiFePO4 Cathode in Li-ion Batteries PVDF粘结剂结晶度对锂离子电池LiFePO4正极性能影响的研究

Oxford open materials science Pub Date : 2023-01-01 DOI: 10.1093/oxfmat/itad019

Joseph Nishanth, M Dinachandra Singh, Santu Panja, T Mani Chandran, Kumar Brajesh, Shobit Omar, Kanwar S Nalwa

{"title":"Investigating the Influence of PVDF Binder Crystallinity on the Performance of LiFePO4 Cathode in Li-ion Batteries","authors":"Joseph Nishanth, M Dinachandra Singh, Santu Panja, T Mani Chandran, Kumar Brajesh, Shobit Omar, Kanwar S Nalwa","doi":"10.1093/oxfmat/itad019","DOIUrl":"https://doi.org/10.1093/oxfmat/itad019","url":null,"abstract":"Abstract Poly(vinylidene fluoride) (PVDF) has been widely utilized as a binder material in cathode as well as anode preparation for Li-ion batteries. Recent reports on water-soluble and functional binders have firmly established that even though the binder consists of only a small part of the electrode, it can significantly boost cell performance. However, no previous report has specifically explored the role of PVDF crystallinity on the performance of the LiFePO4 cathode and cell. In the present work, LiFePO4 cathodes with two different binders PVDF 1 (Kynar HSV 900), and PVDF 2 (Solef 5130) have been prepared. The PVDF binder with higher crystallinity showed more viscosity (86.3 Pa.s), higher adhesion strength (11.42 N-cm−1), and minimal electrolyte uptake (11.3%) as compared to the low crystallinity binder (32.8 Pa.s, 1.30 N-cm−1, and 18.88%). Thus, the cell having more crystalline PVDF binder showed a higher initial capacity of ∼146 mAh-g−1 and stable cyclability performance (82% capacity retention after 500 cycles) as compared to the cell with less crystalline binder PVDF (∼136 mAh-g−1 and 64%). The post-mortem analysis performed after 500 cycles of charging and discharging revealed relatively smaller cracks formed in the cathode with higher crystallinity binder, which explains its better cyclability.","PeriodicalId":74385,"journal":{"name":"Oxford open materials science","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135447897","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

Adhesion of dental ceramic materials to titanium and titanium alloys: a review 牙科陶瓷材料与钛及钛合金的粘附性研究进展

Oxford open materials science Pub Date : 2023-01-01 DOI: 10.1093/oxfmat/itad011

I. Parushev, T. Dikova, I. Katreva, Yavor Gagov, S. Simeonov

{"title":"Adhesion of dental ceramic materials to titanium and titanium alloys: a review","authors":"I. Parushev, T. Dikova, I. Katreva, Yavor Gagov, S. Simeonov","doi":"10.1093/oxfmat/itad011","DOIUrl":"https://doi.org/10.1093/oxfmat/itad011","url":null,"abstract":"\u0000 In recent years, the application of titanium and its alloys for production of metal frameworks for metal–ceramic fixed partial dentures (FPDs) has been increasing. They are fabricated mainly by casting, CAD/CAM milling and selective laser melting. Manufacturing technologies affect the surface characteristics of the metal, which in turn affects the adhesion in the metal–ceramic system. Therefore, the purpose of the present article is to analyse the information about the adhesion of dental ceramics to pure titanium and its alloys, emphasizing the methods most commonly applied to improve adhesion. Based on the papers published last 10 years, the pure titanium and its alloys, the main technologies for their production and the porcelains applied in the fabrication of metal–ceramic FPDs are examined. It is summarized that the methods for increasing the adhesion strength of the porcelains to the titanium and Ti alloys can be classified into five large groups: mechanical, physical, chemical methods, application of bonding agents and combined treatments, as clear boundaries between them cannot be set. In the last decade, the successful technologies for improving the adhesion strength of Ti and its alloys to the porcelain usually consist of a combination of successive treatments of the metal surface. Abrasion of the titanium surface by sandblasting is most often used initially. At the next stage, a bonding agent or other type of intermediate layer of different coatings is applied to the metal, which further improves the adhesion strength to the porcelain.","PeriodicalId":74385,"journal":{"name":"Oxford open materials science","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44879500","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

Recent progress in low-temperature CVD growth of 2D materials 二维材料低温CVD生长研究进展

Oxford open materials science Pub Date : 2023-01-01 DOI: 10.1093/oxfmat/itad010

Xiang Zhang, J. Lai, Tia Gray

{"title":"Recent progress in low-temperature CVD growth of 2D materials","authors":"Xiang Zhang, J. Lai, Tia Gray","doi":"10.1093/oxfmat/itad010","DOIUrl":"https://doi.org/10.1093/oxfmat/itad010","url":null,"abstract":"\u0000 Two-dimensional (2D) materials have emerged as a promising class of materials with unique physical and chemical properties that offer exciting prospects for various applications. Among all the synthesis methods, chemical vapor deposition (CVD) techniques have demonstrated great advantages in the large-scale production of 2D materials with a controlled thickness. One of the main challenges in the growth of 2D materials is the need for high temperatures and crystalline substrates, which restrict the scalability and compatibility of 2D materials with existing manufacturing processes, due to the high thermal budget and the necessity to transfer the 2D films to secondary substrates. Low-temperature growth methods for 2D materials have the potential to overcome this challenge and enable the integration of 2D materials into a wide range of devices and applications. In recent years, there have been substantial efforts to develop low-temperature growth techniques for different 2D materials, including graphene, hexagonal boron nitride and transition metal dichalcogenides. These methods include thermal CVD, plasma-enhanced CVD, atomic layer deposition and metal-organic chemical vapor deposition. This review not only discusses the progress in the growth but also highlights the applications of low-temperature-grown 2D materials in various fields, such as field effect transistors, sensors, photodetectors, catalysts, batteries and supercapacitors.","PeriodicalId":74385,"journal":{"name":"Oxford open materials science","volume":" ","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44227714","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

Correction to: Tensile behaviour of unaged and hygrothermally aged discontinuous Bouligand structured CFRP composites 修正:未老化和湿热老化不连续Bouligand结构CFRP复合材料的拉伸行为

Oxford open materials science Pub Date : 2023-01-01 DOI: 10.1093/oxfmat/itad001

引用次数: 1

Correction to: Metal-based porous hydrogels for highly conductive biomaterial scaffolds 修正:金属基多孔水凝胶用于高导电性生物材料支架

Oxford open materials science Pub Date : 2023-01-01 DOI: 10.1093/oxfmat/itad006

引用次数: 2

Phase evolution and enhanced room temperature piezoelectric properties response of lead-free Ru doped BaTiO3 ceramic 无铅钌掺杂BaTiO3陶瓷的相演化及增强的室温压电性能响应

Oxford open materials science Pub Date : 2023-01-01 DOI: 10.1093/oxfmat/itad015

Kumar Brajesh, Sudhir Ranjan, Ashish Garg

{"title":"Phase evolution and enhanced room temperature piezoelectric properties response of lead-free Ru doped BaTiO3 ceramic","authors":"Kumar Brajesh, Sudhir Ranjan, Ashish Garg","doi":"10.1093/oxfmat/itad015","DOIUrl":"https://doi.org/10.1093/oxfmat/itad015","url":null,"abstract":"Abstract Recent years have witnessed considerable work on the development of lead-free piezoelectric ceramic materials and their structure–property correlations. The development of piezo response is a strong function of phase evolution in these materials. In this work, we report the effect of Ru doping and consequent phase evolution on the maximization of piezoelectric response of polycrystalline lead-free barium titanate, depicted as Ba(RuxTi1-x)O3 (BRT). The samples were prepared in a narrow compositional range of 0 ≤ x ≤ 0.03 using the conventional solid-state reaction method. Ru doping increases the leakage current of BaTiO3 samples attributed to increased oxygen vacancy concentration due to substitution of Ti4+ by Ru3+. Detailed structural analysis reveals that samples exhibiting coexistence of tetragonal (space group: P4mm) and orthorhombic (space group: Amm2) structured phases near room temperature reveal relatively enhanced piezoelectric properties. The BRT sample with Ru content of 2 mol% yields a maximum longitudinal piezoelectric coefficient, d33 of ∼269 pC/N, a high strain value of 0.16% with a large remnant polarization of ∼19 µC/cm2 and a coercive field of 5.8 kV/cm. We propose that the ‘4d’ orbital of Ruthenium plays a crucial role in improving the functional properties and in decreasing the ferroelectric Curie temperature. Our work provides clues into tailoring the phase evolution for designing lead-free piezoelectric materials with enhanced piezoelectric properties.","PeriodicalId":74385,"journal":{"name":"Oxford open materials science","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"136137584","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

Correction: Synthesis and structural characterizations of HAp–NaOH–Al2O3 composites for liquid petroleum gas sensing applications 更正：用于液体石油气传感应用的HAp–NaOH–Al2O3复合材料的合成和结构表征

Oxford open materials science Pub Date : 2023-01-01 DOI: 10.1093/oxfmat/itad008

引用次数: 0