Surfaces最新文献_第10页

Structural, Magnetic, and Optical Properties of Mn2+ Doping in ZnO Thin Films ZnO薄膜中掺杂Mn2+的结构、磁性和光学性质

Surfaces Pub Date : 2021-10-31 DOI: 10.3390/surfaces4040022

Monika Sharma, K. Bera, Ruby Mishra, A. V. Kuanr

{"title":"Structural, Magnetic, and Optical Properties of Mn2+ Doping in ZnO Thin Films","authors":"Monika Sharma, K. Bera, Ruby Mishra, A. V. Kuanr","doi":"10.3390/surfaces4040022","DOIUrl":"https://doi.org/10.3390/surfaces4040022","url":null,"abstract":"MnxZn1−xO thin films (x = 0%, 1%, 3%, and 5%) were grown on corning glass substrates using sol–gel technique. Single-phase hexagonal wurtzite structure was confirmed using X-ray diffraction. Raman analysis revealed the presence of Mn content with an additional vibrational mode at 570 cm−1. The surface morphology of the samples was observed by scanning electron microscopy which suggested that the grain size increases with an increase in Mn concentration. The optical bandgap increases with increasing Mn concentration due to a significant blueshift in UV–visible absorption spectra. The alteration of the bandgap was verified by the I–V measurements on ZnO and Mn-ZnO films. The various functional groups in the thin films were recorded using FTIR analysis. Magnetic measurements showed that MnxZn1−xO films are ferromagnetic, as Mn induces a fully polarised state. The effect of Mn2+ ions doping on MnxZn1−xO thin films was investigated by extracting various parameters such as lattice parameters, energy bandgap, resistivity, and magnetisation. The observed coercivity is about one-fifth of the earlier published work data which indicates the structure is soft in nature, having less dielectric/magnetic loss, and hence can be used as ultra-fast switching in spintronic devices.","PeriodicalId":22129,"journal":{"name":"Surfaces","volume":"46 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-10-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74807168","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: 9

Nondestructive Measurement of Emissivity of Damaged Parts of Coatings 涂层损伤部位发射率的无损测量

Surfaces Pub Date : 2021-10-22 DOI: 10.3390/surfaces4040021

Dikai Jiang, Yiwen Li, Weizhuo Hua, Peng Kuang, Bo Xu

{"title":"Nondestructive Measurement of Emissivity of Damaged Parts of Coatings","authors":"Dikai Jiang, Yiwen Li, Weizhuo Hua, Peng Kuang, Bo Xu","doi":"10.3390/surfaces4040021","DOIUrl":"https://doi.org/10.3390/surfaces4040021","url":null,"abstract":"Low Infrared emissivity coating (LIREC) is prone to generating some problems such as bulges, degumming, and abrasion. In order to study whether the performance of LIREC under different damages can meet the work needs, it is essential to timely measure and evaluate the performance state of LIREC in the application process. The existing methods for measuring the damage of LIREC have some disadvantages such as expensive equipment, complex operation, and inaccurate measurement results. In this paper, a measurement method of LIREC damage capability based on thermal imager is proposed. The radiation temperature is measured by thermal imager, the real temperature and ambient temperature of coating surface are measured by thermocouple, and the emittance of coating surface is calculated. Non-contact and continuous large-area emissivity measurements are carried out on the damaged parts of the coating and verified by experiments. The measurement results show that the different damage types and damage degrees directly affect the measurement results of LIREC. Wear damage increases the emissivity of the coating while debonding damage basically does not change the coating emissivity. Shedding damage of small diameter forms voids, which causes the increase of the damage parts of emittance. In addition, bulge damage impedes temperature transfer and reduces emissivity. This method can timely and accurately measure and evaluate the performance state of LIREC and can provide a new idea for the accurate measurement of damage emissivity of LIREC.","PeriodicalId":22129,"journal":{"name":"Surfaces","volume":"20 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-10-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74919202","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

Innovative Coatings for Materials Subjected to Aggressive Environments 耐腐蚀性环境下材料的创新涂层

Surfaces Pub Date : 2021-09-30 DOI: 10.3390/surfaces4040020

Argelia Fabiola Miranda Pérez

引用次数: 0

Molecular Dynamics Modeling of Mechanical Properties of Polymer Nanocomposites Reinforced by C7N6 Nanosheet C7N6纳米片增强聚合物纳米复合材料力学性能的分子动力学建模

Surfaces Pub Date : 2021-08-24 DOI: 10.3390/surfaces4030019

Qinghua Zhang, B. Mortazavi, F. Aldakheel

{"title":"Molecular Dynamics Modeling of Mechanical Properties of Polymer Nanocomposites Reinforced by C7N6 Nanosheet","authors":"Qinghua Zhang, B. Mortazavi, F. Aldakheel","doi":"10.3390/surfaces4030019","DOIUrl":"https://doi.org/10.3390/surfaces4030019","url":null,"abstract":"Carbon-nitride nanosheets have attracted remarkable attention in recent years due to their outstanding physical properties. C7N6 is one of the hotspot nanosheets which possesses excellent mechanical, electrical, and optical properties. In this study, the coupled thermo-mechanical properties of the single nanosheet C7N6 are systematically investigated. Although temperature effects have a strong influence on the mechanical properties of C7N6 monolayer, thermal effects were not fully analyzed for carbon-nitride nanosheet and still an open topic. To this end, the presented contribution aims to highlight this important aspect and investigate the temperature influence on the mechanical stress-strain response. By using molecular dynamics (MD) simulation, we have found out that the C7N6 monolayer’s maximum strength decreases as the temperature increase from 300 K to 1100 K. In the current contribution, 5% to 15% volume fractions of C7N6/P3HT composite were employed to investigate the C7N6 reinforcing ability. Significantly, the uniaxial tensile of C7N6/P3HT composite reveals that 10%C7N6 can enhance the maximum strength of the composite to 121.80 MPa which is 23.51% higher than the pure P3HT matrix. Moreover, to better understand the enhanced mechanism, we proposed a cohesive model to investigate the interface strength between the C7N6 nanosheet and P3HT matrix. This systematic study provides not only a sufficient method to understand the C7N6 thermo-mechanical properties, but also the reinforce mechanism of the C7N6 reinforced nanocomposite. Thus, this work provides a valuable method for the later investigation of the C7N6 nanosheet.","PeriodicalId":22129,"journal":{"name":"Surfaces","volume":"37 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-08-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80177792","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: 3

A Brief Insight to the Electrophoretic Deposition of PEEK-, Chitosan-, Gelatin-, and Zein-Based Composite Coatings for Biomedical Applications: Recent Developments and Challenges 生物医学应用中PEEK-，壳聚糖-，明胶-和玉米蛋白基复合涂层的电泳沉积:最新发展和挑战

Surfaces Pub Date : 2021-08-04 DOI: 10.3390/surfaces4030018

Syeda Ammara Batool, A. Wadood, S. W. Hussain, M. Yasir, M. A. Ur Rehman

{"title":"A Brief Insight to the Electrophoretic Deposition of PEEK-, Chitosan-, Gelatin-, and Zein-Based Composite Coatings for Biomedical Applications: Recent Developments and Challenges","authors":"Syeda Ammara Batool, A. Wadood, S. W. Hussain, M. Yasir, M. A. Ur Rehman","doi":"10.3390/surfaces4030018","DOIUrl":"https://doi.org/10.3390/surfaces4030018","url":null,"abstract":"Electrophoretic deposition (EPD) is a powerful technique to assemble metals, polymer, ceramics, and composite materials into 2D, 3D, and intricately shaped implants. Polymers, proteins, and peptides can be deposited via EPD at room temperature without affecting their chemical structures. Furthermore, EPD is being used to deposit multifunctional coatings (i.e., bioactive, antibacterial, and biocompatible coatings). Recently, EPD was used to architect multi-structured coatings to improve mechanical and biological properties along with the controlled release of drugs/metallic ions. The key characteristics of EPD coatings in terms of inorganic bioactivity and their angiogenic potential coupled with antibacterial properties are the key elements enabling advanced applications of EPD in orthopedic applications. In the emerging field of EPD coatings for hard tissue and soft tissue engineering, an overview of such applications will be presented. The progress in the development of EPD-based polymeric or composite coatings, including their application in orthopedic and targeted drug delivery approaches, will be discussed, with a focus on the effect of different biologically active ions/drugs released from EPD deposits. The literature under discussion involves EPD coatings consisting of chitosan (Chi), zein, polyetheretherketone (PEEK), and their composites. Moreover, in vitro and in vivo investigations of EPD coatings will be discussed in relation to the current main challenge of orthopedic implants, namely that the biomaterial must provide good bone-binding ability and mechanical compatibility.","PeriodicalId":22129,"journal":{"name":"Surfaces","volume":"22 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-08-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76030614","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: 7

Electro-Polymerized Titan Yellow Modified Carbon Paste Electrode for the Analysis of Curcumin 电聚合泰坦黄修饰碳糊电极分析姜黄素

Surfaces Pub Date : 2021-07-23 DOI: 10.3390/SURFACES4030017

Edwin S. D’Souza, J. G. Manjunatha, C. Raril, Girish Tigari, H. J. Arpitha, Suvarnalatha Shenoy

{"title":"Electro-Polymerized Titan Yellow Modified Carbon Paste Electrode for the Analysis of Curcumin","authors":"Edwin S. D’Souza, J. G. Manjunatha, C. Raril, Girish Tigari, H. J. Arpitha, Suvarnalatha Shenoy","doi":"10.3390/SURFACES4030017","DOIUrl":"https://doi.org/10.3390/SURFACES4030017","url":null,"abstract":"A modest, efficient, and sensitive chemically modified electrode was fabricated for sensing curcumin (CRC) through an electrochemically polymerized titan yellow (TY) modified carbon paste electrode (PTYMCPE) in phosphate buffer solution (pH 7.0). Cyclic voltammetry (CV) linear sweep voltammetry (LSV) and differential pulse voltammetry (DPV) approaches were used for CRC detection. PTYMCPE interaction with CRC suggests that the electrode exhibits admirable electrochemical response as compared to bare carbon paste electrode (BCPE). Under the optimized circumstances, a linear response of the electrode was observed for CRC in the concentration range 2 × 10−6 M to 10 × 10−6 M with a limit of detection (LOD) of 10.94 × 10−7 M. Moreover, the effort explains that the PTYMCPE electrode has a hopeful approach for the electrochemical resolution of biologically significant compounds. Additionally, the proposed electrode has demonstrated many advantages such as easy preparation, elevated sensitivity, stability, and enhanced catalytic activity, and can be successfully applied in real sample analysis.","PeriodicalId":22129,"journal":{"name":"Surfaces","volume":"40 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2021-07-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82667248","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: 3

Ionic Systems and Nanomaterials as Antiseptic and Disinfectant Agents for Surface Applications: A Review 离子体系和纳米材料作为表面防腐和消毒剂的研究进展

Surfaces Pub Date : 2021-06-07 DOI: 10.3390/SURFACES4020016

Francisco Faísca, L. Filipe, Ž. Petrovski, Miguel M. Santos, S. Gago, L. Branco

引用次数: 0

Electrodeposition of Cu on PEDOT for a Hybrid Solid-State Electronic Device 混合固态电子器件PEDOT上电沉积Cu的研究

Surfaces Pub Date : 2021-05-24 DOI: 10.3390/SURFACES4020015

Martina Vizza, Giulio Pappaianni, Walter Giurlani, A. Stefani, R. Giovanardi, M. Innocenti, C. Fontanesi

{"title":"Electrodeposition of Cu on PEDOT for a Hybrid Solid-State Electronic Device","authors":"Martina Vizza, Giulio Pappaianni, Walter Giurlani, A. Stefani, R. Giovanardi, M. Innocenti, C. Fontanesi","doi":"10.3390/SURFACES4020015","DOIUrl":"https://doi.org/10.3390/SURFACES4020015","url":null,"abstract":"Conductive polymers are nowadays attracting great attention for their peculiar mechanical, electrical and optical proprieties. In particular, PEDOT can be used in a wide range of innovative applications, from electroluminescent devices to photovoltaics. In this work, the electrochemical deposition of 3,4 ethylenedioxythiophene (EDOT) was performed on various substrates (ITO, thin films of gold and palladium on silicon wafers) by means of both potentiostatic and potentiodynamic techniques. This was intended to further expand the applications of electrochemically deposited PEDOT, particularly regarding the preparation of thin films in tight contact with electrode surfaces. This allows one to obtain systems prone to be used as electrodes in stacked devices. Chronoamperometric experiments were performed to study the nucleation and growth process of PEDOT. SEM, ESEM and AFM analysis allowed the characterization of the morphology of the polymeric films obtained. Raman and visible spectroscopy confirmed the high-quality of the coatings on the different substrates. Then, the PEDOT films were used as the base material for the further electrodeposition of a copper layer. In this way, a hybrid electronic device was obtained, by using electrochemical methods only. The high conductivity and ohmic behavior of the device were confirmed over a wide range of frequencies with electrical impedance spectroscopy analysis.","PeriodicalId":22129,"journal":{"name":"Surfaces","volume":"33 1","pages":"157-168"},"PeriodicalIF":0.0,"publicationDate":"2021-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75197639","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: 6

Finite Element Analyses of the Modified Strain Gradient Theory Based Kirchhoff Microplates 基于修正应变梯度理论的Kirchhoff微孔板有限元分析

Surfaces Pub Date : 2021-05-14 DOI: 10.3390/SURFACES4020014

Murat Kandaz, H. Dal

引用次数: 2

Reactive Dual Magnetron Sputtering: A Fast Method for Preparing Stoichiometric Microcrystalline ZnWO4 Thin Films 反应性双磁控溅射:制备化学计量微晶ZnWO4薄膜的快速方法

Surfaces Pub Date : 2021-04-27 DOI: 10.3390/SURFACES4020013

Yannick Hermans, F. Mehmood, K. Lakus-Wollny, J. Hofmann, T. Mayer, W. Jaegermann

引用次数: 0