Science and Technology of Materials最新文献

Development of antimicrobial leather modified with Ag–TiO2 nanoparticles for footwear industry 银- tio2纳米颗粒改性抗菌皮革的研制

Science and Technology of Materials Pub Date : 2018-12-01 DOI: 10.1016/j.stmat.2018.09.002

I. Carvalho , S. Ferdov , C. Mansilla , S.M. Marques , M.A. Cerqueira , L.M. Pastrana , M. Henriques , C. Gaidau , P. Ferreira , S. Carvalho

{"title":"Development of antimicrobial leather modified with Ag–TiO2 nanoparticles for footwear industry","authors":"I. Carvalho , S. Ferdov , C. Mansilla , S.M. Marques , M.A. Cerqueira , L.M. Pastrana , M. Henriques , C. Gaidau , P. Ferreira , S. Carvalho","doi":"10.1016/j.stmat.2018.09.002","DOIUrl":"10.1016/j.stmat.2018.09.002","url":null,"abstract":"<div>The proposed work aims to functionalize leathers for footwear industry with antimicrobial properties based on Ag–TiO2 nanoparticles. The synthesis of nanoparticles was carried out by the hydrothermal method with significant advantages in terms of time, energy savings and low cost. Anatase TiO2 nanoparticles with dimensions below 10<!--> nm were obtained as observed by X-ray diffraction and transmission electron microscopy. Fourier transform infrared spectroscopy showed that the based structure of leather was not modified by the addition of the nanoparticles. The antimicrobial activity was evaluated and it was observed that Ag containing leathers gained antimicrobial activity. In addition, the nanoparticles were found to be non-cytotoxic. This achievement, by itself, should be quite appealing to the footwear industry as it could consist in a solid value-preposition given the commonness of fungal infections promoted by humidity, poor breathability and temperature that promote the expansion of the microflora of the skin.</div>","PeriodicalId":101145,"journal":{"name":"Science and Technology of Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.stmat.2018.09.002","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89725022","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: 16

Carbon fiber from fast pyrolysis bio-oil 快速热解生物油制备的碳纤维

Science and Technology of Materials Pub Date : 2018-12-01 DOI: 10.1016/j.stmat.2018.10.001

D.C.P. Vélez , W.L.E. Magalhães , G. Capobianco

引用次数: 4

Failure analysis of E-glass reinforced PMMA using XFEM 基于XFEM的e -玻璃增强PMMA失效分析

Science and Technology of Materials Pub Date : 2018-12-01 DOI: 10.1016/j.stmat.2018.11.002

A.O. Marcelo Junior , R.C. Sales , F.Y.R. Osterno , K.F. Timbó , S.M.L. da Silva , E.P. de Deus

引用次数: 2

Mechanical behavior of PET fibers and textiles for Stent-Grafts using video extensometry and image analysis 用视频伸测和图像分析的PET纤维和织物支架移植物的机械行为

Science and Technology of Materials Pub Date : 2018-12-01 DOI: 10.1016/j.stmat.2018.11.001

A. Rodrigues , L. Figueiredo , H. Diogo , J. Bordado

引用次数: 10

Numerical modelling of welded T-joint configurations using SYSWELD 基于SYSWELD的焊接t型接头结构数值模拟

Science and Technology of Materials Pub Date : 2018-12-01 DOI: 10.1016/j.stmat.2018.08.002

H.M.E. Ramos, S.M.O. Tavares, P.M.S.T. de Castro

{"title":"Numerical modelling of welded T-joint configurations using SYSWELD","authors":"H.M.E. Ramos, S.M.O. Tavares, P.M.S.T. de Castro","doi":"10.1016/j.stmat.2018.08.002","DOIUrl":"10.1016/j.stmat.2018.08.002","url":null,"abstract":"<div>Advances in computational tools for welding process simulation have been noteworthy, allowing to assess complex phenomena, as is the case of welding distortion and residual stress. The most advanced tools take into account the thermo-metallurgical and thermo-mechanical changes that take place during the welding processes. Considering these changes and the materials properties at the different temperature values, it is possible to obtain reliable models of the welding processes. In this communication, T-joint welded configurations are investigated, considering arc welding and laser beam welding processes. For this purpose, the commercial software ESI SYSWELD was adopted, since it is one of the most advanced tools for this purpose. These models are based on finite elements; therefore, a mesh sensitivity analysis was performed in order to evaluate the minimum element size required for accurate results. In arc welded double side T-joint, different procedures were explored in order to understand the influence in the residual stress; the second pass does not increase the maximum residual stress, however it increases the area with tensile residual stress. Results for a T-joint between a steel tube and a steel plate using laser beam welding (LBW) and arc welding were obtained. The laser beam welds presented a significant reduction of the heated affected zone and, consequently, the tensile residual stresses are confined to a smaller area.</div>","PeriodicalId":101145,"journal":{"name":"Science and Technology of Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.stmat.2018.08.002","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77855983","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: 14

Investigations of geopolymeric mixtures based on phosphate washing waste 以磷酸洗涤废渣为基料的地聚合物混合物研究

Science and Technology of Materials Pub Date : 2018-12-01 DOI: 10.1016/j.stmat.2018.08.001

R. Dabbebi , S. Baklouti , J.L. Barroso de Aguiar , F. Pacheco-Torgal , B. Samet

{"title":"Investigations of geopolymeric mixtures based on phosphate washing waste","authors":"R. Dabbebi , S. Baklouti , J.L. Barroso de Aguiar , F. Pacheco-Torgal , B. Samet","doi":"10.1016/j.stmat.2018.08.001","DOIUrl":"10.1016/j.stmat.2018.08.001","url":null,"abstract":"<div>The extraction of the phosphate ore produces a high amount of waste causing serious environmental problems. This waste, termed as phosphate washing waste, was filtered and dried at 105°C for 24h to remove the water. The dried waste was milled and then sieved in a 100μm sieve. The resulting phosphates washing waste (PWW) particles size are below 70μm. The phosphate washing waste was calcined at 700°C and 900<!--> °C. Both calcined and uncalcined waste were investigated with X-ray fluorescence (XRF), X-ray powder diffraction (DRX), Fourier transform infrared (FTIR), simultaneous differential thermal and thermogravimetric analyses (DTA-TG) and particle size analysis. This waste was activated with sodium hydroxide (NaOH) and sodium silicate in order to produce geopolymeric materials. The influence of replacing PWW by 15% of metakaolin was also study. The results show that the highest compressive strength is obtained with metakaolin. The results also showed that compressive strength decreased with the increase of NaOH concentration.</div>","PeriodicalId":101145,"journal":{"name":"Science and Technology of Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.stmat.2018.08.001","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74533052","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

Evaluation of the effect of the thermal cycle on the characteristics of welded joints through the variation of the heat input of the austhenitic AISI 316L steels by the GMAW process 通过对奥氏体AISI 316L钢GMAW工艺热输入的变化，评价热循环对焊接接头特性的影响

Science and Technology of Materials Pub Date : 2018-12-01 DOI: 10.1016/j.stmat.2018.09.001

R. Demarque, E.P. dos Santos, R.S. Silva, J.A. de Castro

{"title":"Evaluation of the effect of the thermal cycle on the characteristics of welded joints through the variation of the heat input of the austhenitic AISI 316L steels by the GMAW process","authors":"R. Demarque, E.P. dos Santos, R.S. Silva, J.A. de Castro","doi":"10.1016/j.stmat.2018.09.001","DOIUrl":"10.1016/j.stmat.2018.09.001","url":null,"abstract":"<div>Welding processes are generally used in almost every industrial segment, but there are some applications that demand special attention to the product obtained, due to the security it must offer against possible failures.In the present study, the influence of the heat input variation on the weld bead geometry, the austenitic grain size in the HAZ, the microhardness in the HAZ (heat affect zone), and the δ ferrite volumetric fraction using the gas metal arc welding (GMAW) performed with pulsed chain spray transfer, on AISI316L steel plates. The samples had their microstructure characterized by optical microscopy, in their different regions, performing a comparative study of these regions for the different welding conditions. From the variations in the thermal contributions it was demonstrated that the choice of the ideal heat input for a given process has an important effect on the phenomena that occur during welding. The increase of the contribution caused a variation of almost 300% in the austenitic grain size, approximately 100% in the δ ferrite volumetric fraction, and about 240% in the area of the fusion zone (FZ). The temperature distributions of the plates were recorded using a thermal camera in order to monitor the maximum temperatures in each region of the welded joint, the microstructures resulting from the process were later compared with the results of the thermal cycles obtained through numerical simulations. The results showed good agreement and also contributed to the validation of the proposed numerical method, which allowed a better understanding of the thermal history during welding and, consequently, of their effects on the microstructural transformations developed in the AISI 316L steel.</div>","PeriodicalId":101145,"journal":{"name":"Science and Technology of Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.stmat.2018.09.001","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84967045","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: 10

Solar energy and cork: A binomial of the future? 太阳能和软木:未来的二项式?

Science and Technology of Materials Pub Date : 2018-12-01 DOI: 10.1016/j.stmat.2018.11.004

L. Gil

引用次数: 1

Enhanced carbon nanotubes dispersion in epoxy matrices using a CNT tailored block copolymer 利用碳纳米管定制嵌段共聚物增强碳纳米管在环氧基体中的分散

Science and Technology of Materials Pub Date : 2018-12-01 DOI: 10.1016/j.stmat.2018.11.005

J.F. Guedes, M. Martins, N. Rocha

{"title":"Enhanced carbon nanotubes dispersion in epoxy matrices using a CNT tailored block copolymer","authors":"J.F. Guedes, M. Martins, N. Rocha","doi":"10.1016/j.stmat.2018.11.005","DOIUrl":"10.1016/j.stmat.2018.11.005","url":null,"abstract":"<div>Carbon nanotubes (CNT) have been extensively studied, and special attention has been given to their introduction in epoxy matrices, for further reinforcement of carbon fibre reinforced composites. However, the obtained improvements are highly dependent on the level of CNT dispersion and distribution. In this work, we report the use of block copolymers (BCPs) as a solution to provide enhanced compatibility of the CNT in an epoxy-based matrix and as means to provide them further nanostructuration. Studied BCPs were especially formulated for epoxy matrices, being one of them customised to also have strong compatibility for CNT. BCPs were added to CNT without introduction of additional solvents. Different formulations were studied and the CNT dispersion, distribution and interaction with matrix were evaluated by rheology, electron microscopy and dynamic mechanical analysis. The results suggest that the customised BCP can have a significant improvement in the dispersion of the CNT, on the adhesion between the polymeric matrix and the CNT and can provide a mean for nanostructuration.</div>","PeriodicalId":101145,"journal":{"name":"Science and Technology of Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.stmat.2018.11.005","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78228740","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

Mortar and concrete composites with recycled plastic: A review 再生塑料砂浆与混凝土复合材料研究进展

Science and Technology of Materials Pub Date : 2018-12-01 DOI: 10.1016/j.stmat.2018.11.003

I. Mercante, C. Alejandrino, J.P. Ojeda, J. Chini, C. Maroto, N. Fajardo

{"title":"Mortar and concrete composites with recycled plastic: A review","authors":"I. Mercante, C. Alejandrino, J.P. Ojeda, J. Chini, C. Maroto, N. Fajardo","doi":"10.1016/j.stmat.2018.11.003","DOIUrl":"10.1016/j.stmat.2018.11.003","url":null,"abstract":"<div>Valorization of waste plastic as concrete aggregates has become an opportunity. Some advantages are plastic waste recycling, consumption reduction of natural aggregates and improvement of concrete properties. This paper presents a review on addition of recycled plastic waste to cement composites and influence on their properties. Forty five international papers were selected from scientific peer-reviewed journals. The critical items analyzed were: plastic characteristics, mix proportion design and concrete properties. The last item includes fresh and hardened concrete properties, durability performance and thermal conductivity. Although some properties were negatively influenced by the plastics, this paper focuses on the variables that mitigate these effects. The improvement of insulation properties with plastic is widely analyzed, but further research is recommended. As conclusion, application of plastic waste would be useful on both, technical and environmental dimensions and this paper could be used as a helpful tool for studying and designing mortars and concrete composites with recycled plastic.</div>","PeriodicalId":101145,"journal":{"name":"Science and Technology of Materials","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2018-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1016/j.stmat.2018.11.003","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73643254","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: 49