Science and Technology of Materials最新文献_第2页

Study of self-healing properties in concrete with bacteria encapsulated in expanded clay 膨胀粘土包埋细菌混凝土自愈性能研究

Science and Technology of Materials Pub Date : 2018-12-01 DOI: 10.1016/j.stmat.2018.11.006

S.S. Lucas , C. Moxham , E. Tziviloglou , H. Jonkers

引用次数: 47

Flammability characteristics of chemical treated woven hemp fabric reinforced vinyl ester composites 化学处理机麻织物增强乙烯酯复合材料的燃烧特性

Science and Technology of Materials Pub Date : 2018-09-01 DOI: 10.1016/j.stmat.2018.06.001

M.I. Misnon , M.M. Islam , J.A. Epaarachchi , H. Chen , K. Goda , M.T.I. Khan

引用次数: 15

Optical vehicular communication based on a-SiC:H technology 基于a-SiC:H技术的车载光通信

Science and Technology of Materials Pub Date : 2018-09-01 DOI: 10.1016/j.stmat.2018.05.003

Manuel A. Vieira , Manuela Vieira , Paula Louro , Pedro Vieira

{"title":"Optical vehicular communication based on a-SiC:H technology","authors":"Manuel A. Vieira , Manuela Vieira , Paula Louro , Pedro Vieira","doi":"10.1016/j.stmat.2018.05.003","DOIUrl":"10.1016/j.stmat.2018.05.003","url":null,"abstract":"<div>A smart vehicle lighting system that combines the functions of illumination, signaling, communications, and positioning is presented. A traffic scenario is stablished, and tested under ideal environment conditions. Vehicle-to-vehicle (V2V) and infrastructure-to-vehicle (I2V) communications are analyzed. For the V2V communication study, the emitter was developed based on the vehicle headlights, whereas for the study of I2V communication system, the emitter was built on the street-lights. The VLC receivers are located at the vehicle and are used to extract the data from the modulated light beam coming from the LEDs emitters. The VLC receiver is based on a-SiC:H technology and joins the simultaneous demultiplexing operation with the photodetection and self-amplification. The receiver and the transmitters are characterized through spectral response under different optical bias. The spectral sensitivity of the receiver and its optical gain are analyzed. An algorithm to decode the information is established. The experimental results confirmed that the proposed VLC architecture is suitable for the intended applications.</div>","PeriodicalId":101145,"journal":{"name":"Science and Technology of Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.stmat.2018.05.003","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74960877","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

Experimental evaluation of Reactive Yellow 17 degradation using UV light and iron ions activated peroxydisulfate: Efficiency and kinetic model 紫外光和铁离子活化过硫酸氢盐降解活性黄17的实验评价:效率和动力学模型

Science and Technology of Materials Pub Date : 2018-09-01 DOI: 10.1016/j.stmat.2018.07.002

N. Bougdour, A. Sennaoui, I. Bakas, A. Assabbane

{"title":"Experimental evaluation of Reactive Yellow 17 degradation using UV light and iron ions activated peroxydisulfate: Efficiency and kinetic model","authors":"N. Bougdour, A. Sennaoui, I. Bakas, A. Assabbane","doi":"10.1016/j.stmat.2018.07.002","DOIUrl":"10.1016/j.stmat.2018.07.002","url":null,"abstract":"<div>In the present study, the degradation of Reactive Yellow 17 (RY17) azo dye in aqueous solution was performed using UV light and iron ions as activators of peroxydisulfate (S2O82− or PDS). The effect of several parameters affecting the degradation process was studied and the optimum conditions are found to be: [RY17] = 10 mg/L, [Fe2+] = 0.05 mM, [S2O82−] = 1 mM and the pH = 3. The obtained results showed that the removal degrees of RY17 using different processes such as S2O82−/Fe2+, S2O82−/UV and S2O82−/Fe2+/UV was 63.3%, 81.0% and 95.4% respectively within 20 min of the degradation. Based on theses removal degrees, the degradation efficiency of the RY17 increases in the order: S2O82−/Fe2+/UV > S2O82−/UV > S2O82−/Fe2+ > UV > S2O82−. The experimental data were analyzed using the first-order, second-order and Behnajady-Modirshahla-Ghanbery (BMG) kinetic models, and the kinetic data were in good agreement with the BMG model. Under the optimal conditions, the comparative study of the RY17 degradation using two salts Na2S2O8 and K2S2O8 showed a strong similarity. The total mineralization was monitored using COD and TOC techniques. The results showed that the peroxydisulfate activated by UV and Fe2+/UV system is efficient for the degradation and mineralization of RY17; it could also be an alternative for the treatment of the real wastewater contaminated by azo dyes.</div>","PeriodicalId":101145,"journal":{"name":"Science and Technology of Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.stmat.2018.07.002","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86469626","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: 11

Influence of the preparation method on the structural properties of mixed metal oxides 制备方法对混合金属氧化物结构性能的影响

Science and Technology of Materials Pub Date : 2018-09-01 DOI: 10.1016/j.stmat.2018.07.001

Débora Morais Bezerra , Elisabete Moreira Assaf

{"title":"Influence of the preparation method on the structural properties of mixed metal oxides","authors":"Débora Morais Bezerra , Elisabete Moreira Assaf","doi":"10.1016/j.stmat.2018.07.001","DOIUrl":"10.1016/j.stmat.2018.07.001","url":null,"abstract":"<div>In this paper, we report a study of the influence of the synthesis method on the properties of mixed metal oxides. For this, the syntheses of the mixed oxide by chemical coprecipitation and modified polymeric precursor (MPP) methods containing Ni2+, Zn2+, Al2+, and Zr4+ were conducted. For this purpose, the samples were characterized by X-ray powder diffraction, which showed defined peaks for the mixed metal oxides (NiO, ZnO, and ZrO2). The interaction of H2 with mixed oxides has been investigated using temperature-programmed reduction (H2-TPR); this result showed that the modified polymer precursor method favored the presence of the peak at elevated temperatures. The N2 physisorption (BET method) showed that the polymer precursor method provided higher specific surface areas and basic site numbers in relation to the coprecipitation method. Thermogravimetric analysis of the systems decomposition revealed their disintegration at ~550 °C and resulted in mixed metal oxides in both methods.</div>","PeriodicalId":101145,"journal":{"name":"Science and Technology of Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.stmat.2018.07.001","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87341761","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

Eco-concrete with incorporation of blast furnace slag as natural aggregates replacement 掺入高炉矿渣替代天然骨料的生态混凝土

Science and Technology of Materials Pub Date : 2018-09-01 DOI: 10.1016/j.stmat.2017.12.001

M. Senani , N. Ferhoune , A. Guettala , J.B. Aguiar

引用次数: 8

Validation of a direct method to predict the strength of adhesively bonded joints 预测粘接接头强度的直接方法的验证

Science and Technology of Materials Pub Date : 2018-09-01 DOI: 10.1016/j.stmat.2017.12.002

U.T.F. Carvalho, R.D.S.G. Campilho

{"title":"Validation of a direct method to predict the strength of adhesively bonded joints","authors":"U.T.F. Carvalho, R.D.S.G. Campilho","doi":"10.1016/j.stmat.2017.12.002","DOIUrl":"10.1016/j.stmat.2017.12.002","url":null,"abstract":"<div>Cohesive zone models (CZM) are a powerful tool for the design of bonded structures, but they require careful estimation of the cohesive laws for reliable results. This work experimentally evaluates by the J-integral/direct method the tensile and shear CZM laws of three adhesives with distinct ductility. Additionally, by the direct method, the precise shape of the cohesive law in tension and shear of the adhesives is defined. The double-cantilever beam (DCB) and end-notched flexure (ENF) specimens were considered to obtain the tensile and shear CZM laws of the adhesives, respectively. After obtaining the tensile and shear CZM laws, triangular, exponential and trapezoidal CZM laws were built to reproduce their behaviour. Validation of these CZM laws was undertaken with a mixed-mode geometry (double-lap joint) considering the same three adhesives and varying overlap lengths (LO). The strength prediction by this technique revealed accurate predictions for a given CZM law shape, depending on the adhesive ductility, although all CZM law shapes were moderately accurate.</div>","PeriodicalId":101145,"journal":{"name":"Science and Technology of Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.stmat.2017.12.002","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77170465","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

Experimental and numerical analysis of the fracture envelope of composite adhesive joints 复合材料胶合接头断裂包络的实验与数值分析

Science and Technology of Materials Pub Date : 2018-09-01 DOI: 10.1016/j.stmat.2017.11.001

M.A.S. Santos , R.D.S.G. Campilho

{"title":"Experimental and numerical analysis of the fracture envelope of composite adhesive joints","authors":"M.A.S. Santos , R.D.S.G. Campilho","doi":"10.1016/j.stmat.2017.11.001","DOIUrl":"10.1016/j.stmat.2017.11.001","url":null,"abstract":"<div>To increase the confidence in the design of adhesive structures, it is necessary to accurately predict their strength and fracture properties (critical strain energy release rate in tension, GIC, and shear, GIIC). It is of great importance the perception of fracture under mixed-mode, namely in which relates to the strain energy release rate in tension, GI, and shear, GII. This allows choosing the best failure criterion to use in cohesive zone models (CZM), to predict the joints’ behaviour. This work presents an experimental and numerical study using the Single-Leg Bending (SLB) test on bonded specimens to obtain the mixed-mode fracture properties. The analysis of GI and GII obtained during the experimental phase were addressed. Framing the obtained values in several fracture envelopes enable to select which failure criterion is more appropriate for each adhesive. In the numerical simulations it was possible to reproduce the observed behaviour of the experimental tests, with a positive validation of the chosen propagation criteria.</div>","PeriodicalId":101145,"journal":{"name":"Science and Technology of Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.stmat.2017.11.001","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76322499","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: 4

Performance of Ti2AlC composite material in sports equipment Ti2AlC复合材料在运动器材中的性能

Science and Technology of Materials Pub Date : 2018-05-01 DOI: 10.1016/j.stmat.2018.02.004

Y.M. Zhu

{"title":"Performance of Ti2AlC composite material in sports equipment","authors":"Y.M. Zhu","doi":"10.1016/j.stmat.2018.02.004","DOIUrl":"10.1016/j.stmat.2018.02.004","url":null,"abstract":"<div>With the rising and development of material science, the application range of aluminum matrix composites is more and more extensive, and the requirements for performance are also higher. Ti2AlC composites with both the properties of metals and ceramics have been extensively applied in various fields. In this study, highly purified Ti2AlC which synthesized using atmospheric high-temperature calcination, and then it was mixed with Al powder and processed by pressureless sintering at 750  <!-->min; finally Ti2AlC/Al composite was obtained. The obtained material was observed and analyzed using X-ray diffraction (XRD) and applied in the manufacturing of sports equipment. The surface abrasion was observed, and the frictional wear performance was analyzed. The results suggested that the friction coefficient and wear rate sharply decreased with the increase of the sliding speed, the emergence of surface oxide film and running-in; lamellar exfoliation and severe frictional wear appeared on the surface of the sports equipment when the sliding speed was low.</div>","PeriodicalId":101145,"journal":{"name":"Science and Technology of Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.stmat.2018.02.004","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77539499","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

Bioinspired shape controlled antiferromagnetic Co3O4 with prism like-anchored octahedron morphology: A facile green synthesis using Manihot esculenta Crantz extract 具有棱镜状锚定八面体形态的仿生形状控制的反铁磁Co3O4:用马尼奥特culculenta Crantz提取物进行绿色合成

Science and Technology of Materials Pub Date : 2018-05-01 DOI: 10.1016/j.stmat.2018.02.003

E.U. Ikhuoria , S.O. Omorogbe , B.T. Sone , M. Maaza

{"title":"Bioinspired shape controlled antiferromagnetic Co3O4 with prism like-anchored octahedron morphology: A facile green synthesis using Manihot esculenta Crantz extract","authors":"E.U. Ikhuoria , S.O. Omorogbe , B.T. Sone , M. Maaza","doi":"10.1016/j.stmat.2018.02.003","DOIUrl":"10.1016/j.stmat.2018.02.003","url":null,"abstract":"<div>Several strategies have been established for the synthesis of cobalt oxide nanoparticles with tunable sizes, morphologies and magnetic properties that involve the use of environmentally malignant organic solvent and high temperature conditions. Herein, we report on a facile green approach to synthesize antiferromagnetic Co3O4 mesoscale particles, defect free with prism liked-anchored octahedron morphology. The structural and magnetic properties of the as-synthesized Co3O4 nanoparticles were characterized using powder X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive analysis (EDAX), transmission electron microscopy (TEM), thermogravimetric analysis (TGA) coupled mass (MS), Fourier transform infrared spectroscopy (FT-IR) and vibrating sample magnetometer (VSM). The structural properties indicate that the as-synthesized mesostructured Co3O4 particles are pure crystallites of face-centred cubic phase Co3O4. The Co3O4 mesoparticles had bandgap of 2.86 and 2.54eV and showed antiferromagnetic behaviour.</div>","PeriodicalId":101145,"journal":{"name":"Science and Technology of Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.stmat.2018.02.003","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80093383","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: 25