Surfaces最新文献_第7页

Microstructure, Phase Composition, Mechanical Properties and Tribological Properties of Plasma Sprayed Al-25Si Wear-Resistant Coatings 等离子喷涂Al-25Si耐磨涂层的显微组织、相组成、力学性能和摩擦学性能

Surfaces Pub Date : 2022-07-13 DOI: 10.3390/surfaces5030026

Qiqing Peng, Ming Liu, Yanfei Huang, Xinyuan Zhou, G. Ma, Hai-Dong Wang, Z. Xing

{"title":"Microstructure, Phase Composition, Mechanical Properties and Tribological Properties of Plasma Sprayed Al-25Si Wear-Resistant Coatings","authors":"Qiqing Peng, Ming Liu, Yanfei Huang, Xinyuan Zhou, G. Ma, Hai-Dong Wang, Z. Xing","doi":"10.3390/surfaces5030026","DOIUrl":"https://doi.org/10.3390/surfaces5030026","url":null,"abstract":"Owing to the light weight and high energy, the “All-aluminum engine” can reduce fuel consumption and pollutant emissions, showing a great significance in saving resources and protecting the environment, and becoming a research hotspot. However, the aluminum alloy cylinder liners have difficulty withstanding extremely harsh working conditions, such as strong friction and wear, making the engine extremely easy to damage. In this work, Al-25Si wear-resistant coating was deposited by inner hole supersonic plasma spraying technique to improve the wear resistance of the aluminum alloy cylinder liner. The microstructure, phase composition, mechanical properties and tribological properties were tested by SEM, XRD, tribological machine, etc. The results indicated that the coating exhibited an excellent bonding strength of 44.1 MPa, and the average hardness and average friction coefficient of the coating are 267.09 ± 14.85 HV0.2, and 0.20, respectively. The total wear amount, the wear scar width and the wear scar depth of the coating are 2.77 × 10−3 mm3, 654.3 μm and 8.95 μm, respectively, which showed that the coating can significantly improve the tribological properties of the “All-aluminum engine”. The wear mechanism of the coating was mainly interpreted by furrow cutting, extrusion and spalling in two-body abrasive wear, three-body abrasive wear and a small amount of oxidative wear.","PeriodicalId":22129,"journal":{"name":"Surfaces","volume":"68 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89504893","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: 2

Recent Research of NiCo2O4/Carbon Composites for Supercapacitors 超级电容器用NiCo2O4/碳复合材料的研究进展

Surfaces Pub Date : 2022-06-30 DOI: 10.3390/surfaces5030025

Junming Xu, Yangguang Shi, Jipeng Cheng, Xinchang Wang

引用次数: 6

The Effects of Substrate Temperature on the Growth, Microstructural and Magnetic Properties of Gadolinium-Containing Films on Aluminum Nitride 衬底温度对氮化铝表面含钆薄膜生长、微观结构和磁性能的影响

Surfaces Pub Date : 2022-06-09 DOI: 10.3390/surfaces5020024

Craig Ekstrum, R. Venkatesan, C. Kendrick, Moshe Einav, P. Sivaprakash, J. Mayandi, S. Arumugam, Joshua M. Pearce

{"title":"The Effects of Substrate Temperature on the Growth, Microstructural and Magnetic Properties of Gadolinium-Containing Films on Aluminum Nitride","authors":"Craig Ekstrum, R. Venkatesan, C. Kendrick, Moshe Einav, P. Sivaprakash, J. Mayandi, S. Arumugam, Joshua M. Pearce","doi":"10.3390/surfaces5020024","DOIUrl":"https://doi.org/10.3390/surfaces5020024","url":null,"abstract":"To facilitate future novel devices incorporating rare earth metal films and III-V semiconductors on Si substrates, this study investigates the mechanisms of growth via molecular beam epitaxy of gadolinium (Gd) on aluminum nitride (AlN) by determining the impact of substrate temperature on microstructure. The Gd films underwent extensive surface analysis via in situ reflective high energy electron diffraction (RHEED) and ex-situ SEM and AFM. Characterization of the surface features of rare earth metal films is important, as surface geometry has been shown to strongly impact magnetic properties. SEM and AFM imaging determined that Gd films grown on AlN (0001) from 80 °C to 400 °C transition from wetting, nodular films to island–trench growth mode to reduce in-plane lattice strain. XRD and Raman spectroscopy of the films revealed that they were primarily comprised of GdN, Gd and Gd2O3. The samples were also analyzed by a vibrating sample magnetometer (VSM) at room temperature. From the room temperature magnetic studies, the thick films showed superparamagnetic behavior, with samples grown between 240 °C and 270 °C showing high magnetic susceptibility. Increasing GdN (111) 2θ peak position and single-crystal growth modes correlated with increasing peak magnetization of the thin films, suggesting that lattice strain in single-crystal films was the primary driver of enhanced magnetic susceptibility.","PeriodicalId":22129,"journal":{"name":"Surfaces","volume":"14 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-06-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86852319","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: 1

Emerging Chemical Sensing Technologies: Recent Advances and Future Trends 新兴的化学传感技术:最新进展和未来趋势

Surfaces Pub Date : 2022-05-31 DOI: 10.3390/surfaces5020023

A. Felix, M. Orlandi

引用次数: 0

Surfactants for Electrophoretic Deposition of Polyvinylidene Fluoride–Silica Composites 聚偏氟乙烯-二氧化硅复合材料电泳沉积表面活性剂

Surfaces Pub Date : 2022-05-18 DOI: 10.3390/surfaces5020022

Zhengzheng Wang, I. Zhitomirsky

引用次数: 1

SWOT Analysis of Electrical Discharge Coatings: A Case Study of Copper Coating on Titanium Alloy 放电涂层的SWOT分析——以钛合金铜涂层为例

Surfaces Pub Date : 2022-05-16 DOI: 10.3390/surfaces5020021

J. Maddu, Buschaiah Karrolla, R. Shaik, Diana-Petronela Burdhuhos-Nergis

{"title":"SWOT Analysis of Electrical Discharge Coatings: A Case Study of Copper Coating on Titanium Alloy","authors":"J. Maddu, Buschaiah Karrolla, R. Shaik, Diana-Petronela Burdhuhos-Nergis","doi":"10.3390/surfaces5020021","DOIUrl":"https://doi.org/10.3390/surfaces5020021","url":null,"abstract":"The electrical discharge machine (EDM) has been one of the most widely used non-traditional machines in recent decades, primarily used for machining hard materials into various complex shapes and different sizes and, nowadays, used for surface modifications/hard coatings. In this study, the SWOT (strengths, weaknesses, opportunities and threats) of electrical discharge coating was analyzed by conducting a case study. For the purpose of the case study, copper was deposited on the titanium alloy surface (Ti6Al4V). Three electrodes of different copper alloy materials, viz., brass, bronze and copper, were selected for coating the Ti6Al4V surface. Input parameters such as current, pulse-on, pulse-off, flushing pressure and the electrode material were optimized to develop a uniform coating. Experiments were designed according to the L18 orthogonal array, and among them, the samples that showed proper coating, as seen with the naked eye, were selected for morphological and elemental analyses by scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDX. Further, the output responses, viz., the material deposition rate (MDR), electrode wear rate (EWR), surface roughness (SR), elemental data (copper (Cu) and zinc (Zn)) and coating thickness (CT), were considered for the optimization of coatings. Implementing the Technique for Order Performance by Similarity to Ideal Solution, copper coating with a thickness of 20.43 µm, developed with an MDR with input parameters of 20 A current, 600 µs pulse-on, 120 µs pulse-off, 0.5 bar flushing pressure and the brass electrode, was selected as the optimum coating. The most influential parameters in this coating process were the current and pulse-on time. In this study, a SWOT table was developed to depict the strengths, weaknesses, opportunities and threats of electrical discharge coating.","PeriodicalId":22129,"journal":{"name":"Surfaces","volume":"4 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83024690","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: 2

Density Functional Theory Calculations of the Effect of Oxygenated Functionals on Activated Carbon towards Cresol Adsorption 含氧官能团对活性炭吸附甲酚影响的密度泛函理论计算

Surfaces Pub Date : 2022-05-02 DOI: 10.3390/surfaces5020020

A. Supong, U. Sinha, D. Sinha

{"title":"Density Functional Theory Calculations of the Effect of Oxygenated Functionals on Activated Carbon towards Cresol Adsorption","authors":"A. Supong, U. Sinha, D. Sinha","doi":"10.3390/surfaces5020020","DOIUrl":"https://doi.org/10.3390/surfaces5020020","url":null,"abstract":"The mechanism of adsorption of p-cresol over activated carbon adsorbent and the specific role of oxygen functional groups on cresol adsorption were studied using density functional theory (DFT) calculations. All the energy calculations and geometry optimization pertaining to DFT calculations were done using the B3LYP hybrid functional at basis set 6-31g level of theory in a dielectric medium of ε = 80 (corresponding to water). The interaction of cresol with different activated carbon models, namely pristine activated carbon, hydroxyl functionalized activated carbon, carbonyl functionalized activated carbon, and carboxyl functionalized activated carbon, were considered, and their adsorption energies corresponded to −416.47 kJ/mol, −54.73 kJ/mol, −49.99 kJ/mol, and −63.62 kJ/mol, respectively. The high adsorption energies suggested the chemisorptive nature of the cresol-activated carbon adsorption process. Among the oxygen functional groups, the carboxyl group tended to influence the adsorption process more than the hydroxyl and carbonyl groups, attributing to the formation of two types of hydrogen bonds between the carboxyl activated carbon and the cresol simultaneously. The outcomes of this study may provide valuable insights for future directions to design activated carbon with improved performance towards cresol adsorption.","PeriodicalId":22129,"journal":{"name":"Surfaces","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90836981","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

Synthesis and Electrochemical Properties of Lignin-Derived High Surface Area Carbons 木质素衍生高比表面积碳的合成及其电化学性能

Surfaces Pub Date : 2022-04-06 DOI: 10.3390/surfaces5020019

Artur M. Suzanowicz, Youngjin Lee, Abigail Schultz, Otavio J. B. J. Marques, Hao Lin, C. Segre, B. Mandal

{"title":"Synthesis and Electrochemical Properties of Lignin-Derived High Surface Area Carbons","authors":"Artur M. Suzanowicz, Youngjin Lee, Abigail Schultz, Otavio J. B. J. Marques, Hao Lin, C. Segre, B. Mandal","doi":"10.3390/surfaces5020019","DOIUrl":"https://doi.org/10.3390/surfaces5020019","url":null,"abstract":"Activated carbons play an essential role in developing new electrodes for renewable energy devices due to their electrochemical and physical properties. They have been the subject of much research due to their prominent surface areas, porosity, light weight, and excellent conductivity. The performance of electric double-layer capacitors (EDLCs) is highly related to the morphology of porous carbon electrodes, where high surface area and pore size distribution are proportional to capacitance to a significant extent. In this work, we designed and synthesized several activated carbons based on lignin for both supercapacitors and Li-S batteries. Our most favorable synthesized carbon material had a very high specific surface area (1832 m2·g−1) and excellent pore diameter (3.6 nm), delivering a specific capacitance of 131 F·g−1 in our EDLC for the initial cycle. This translates to an energy density of the supercapacitor cell at 55.6 Wh·kg−1. Using this material for Li-S cells, composited with a nickel-rich phosphide and sulfur, showed good retention of soluble lithium polysulfide intermediates by maintaining a specific capacity of 545 mA·h·g−1 for more than 180 cycles at 0.2 C.","PeriodicalId":22129,"journal":{"name":"Surfaces","volume":"2 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-04-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77009163","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: 2

4-Mercaptobenzoic Acid Adsorption on TiO2 Anatase (101) and TiO2 Rutile (110) Surfaces 4-巯基苯甲酸在TiO2锐钛矿(101)和TiO2金红石(110)表面的吸附

Surfaces Pub Date : 2022-04-05 DOI: 10.3390/surfaces5020017

C. L. Compean-Gonzalez, A. Thomas, K. Syres, J. Cole, Zheshen Li

引用次数: 0

Temperature Effects in the Initial Stages of Heteroepitaxial Film Growth 温度对异质外延膜生长初期的影响

Surfaces Pub Date : 2022-04-05 DOI: 10.3390/surfaces5020018

T. To, F. D. Aarão Reis

{"title":"Temperature Effects in the Initial Stages of Heteroepitaxial Film Growth","authors":"T. To, F. D. Aarão Reis","doi":"10.3390/surfaces5020018","DOIUrl":"https://doi.org/10.3390/surfaces5020018","url":null,"abstract":"Kinetic Monte Carlo simulations of a model of thin film heteroepitaxy are performed to investigate the effects of the deposition temperature in the initial growth stages. Broad ranges of the rates of surface processes are used to model materials with several activation energies and several temperature changes, in conditions of larger diffusivity on the substrate in comparison with other film layers. When films with the same coverage are compared, the roughness increases with the deposition temperature in the regimes of island growth, coalescence, and initial formation of the continuous films. Concomitantly, the position of the minimum of the autocorrelation function is displaced to larger sizes. These apparently universal trends are consequences of the formation of wider and taller islands, and are observed with or without Ehrlich-Schwöebel barriers for adatom diffusion at step edges. The roughness increase with temperature qualitatively matches the observations of recent works on the deposition of inorganic and organic materials. In thicker films, simulations with some parameter sets show the decrease of roughness with temperature. In these cases, a re-entrance of roughness may be observed in the initial formation of the continuous films.","PeriodicalId":22129,"journal":{"name":"Surfaces","volume":"5 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2022-04-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89190752","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