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Binder Microstructures Developed during the Hydration Process in the System Portland Cement – Calcium Aluminate Cement – Calcium Sulfate 硅酸盐水泥-铝酸钙水泥-硫酸钙体系水化过程中粘结剂微观结构的形成
MRS Proceedings Pub Date : 2016-01-01 DOI: 10.1557/OPL.2016.20
A. Moncea, A. Panait, G. Deák, G. Poteraș
{"title":"Binder Microstructures Developed during the Hydration Process in the System Portland Cement – Calcium Aluminate Cement – Calcium Sulfate","authors":"A. Moncea, A. Panait, G. Deák, G. Poteraș","doi":"10.1557/OPL.2016.20","DOIUrl":"https://doi.org/10.1557/OPL.2016.20","url":null,"abstract":"Lately, the investigations of binders from ternary system Portland cement (PC), calcium aluminate cement (CAC) and calcium sulfate ( $Coverline S$ ), have gone through a larger stage of development due to their special properties such as fast setting and rapid hardening, early strength, non-efflorescence, etc. These special properties are ensured by the binder’s microstructure, developed through hydration processes and reactions between hydrate components, which allows us to use them in special environments (aggressive environments with very low or very high level of pH, environments with high temperature, etc.). The binders from this system were simply named “dry mortars”, and provide the final user with an easy processing. In order to explain the mechanical behavior of the specimens exposed in normal curing conditions (T = 20 ± 2 °C and R.H. ≈ 95%), and with different percentages of calcium sulfate (added as hemihydrate or anhydrite), research on the microstructure of the hardened system was performed using SEM and XRD investigation techniques. The analyses have been performed on the binder pastes, hydrated for 1 and 28 days. The tests results showed that the specimen with anhydrous $Coverline S$ content had the best mechanical behavior.","PeriodicalId":18884,"journal":{"name":"MRS Proceedings","volume":"31 1","pages":"71-76"},"PeriodicalIF":0.0,"publicationDate":"2016-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73884905","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
Effect of severe plastic deformation on an extruded ZK60 magnesium alloy 挤压ZK60镁合金剧烈塑性变形的影响
MRS Proceedings Pub Date : 2016-01-01 DOI: 10.1557/OPL.2016.82
F. Dumitru, G. Deák, Ó. Higuera-Cobos, J. Cabrera-Marrero
{"title":"Effect of severe plastic deformation on an extruded ZK60 magnesium alloy","authors":"F. Dumitru, G. Deák, Ó. Higuera-Cobos, J. Cabrera-Marrero","doi":"10.1557/OPL.2016.82","DOIUrl":"https://doi.org/10.1557/OPL.2016.82","url":null,"abstract":"Equal channel angular pressing (ECAP) was carried out on extruded ZK60 magnesium alloy until an equivalent strain of ∼4 (corresponding to 4 passes) at 523K following route Bc. The effect of the deformation on both microstructure and texture was investigated by analysis of inverse pole figures and pole figures respectively, determined by EBSD. Additionaly, the mechanical properties were evaluated through tensile tests. The ECAPed processed ZK60 alloy showed the presence of dynamic recrystallization (DRX) process, correlated with a strong basal fiber texture. The presence of pyramidal slip was also observed, which can be correlated with the presence on twin-oriented boundaries in the material. Both the grain size reduction and the existence of texture influenced the ductility of the magnesium alloy processed by ECAP, as the ductility of the ZK60 alloy after four ECAP passes increased two times in comparation with the initial (un-processed) material.","PeriodicalId":18884,"journal":{"name":"MRS Proceedings","volume":"8 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2016-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72709634","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: 5
Production of Amorphous Alloys by Special Electrometallurgy Methods 特殊电冶金法生产非晶合金
MRS Proceedings Pub Date : 2016-01-01 DOI: 10.1557/opl.2016.12
V. Shapovalov, Y. Nikitenko, A. Manulyk, D. Kalashnyk
{"title":"Production of Amorphous Alloys by Special Electrometallurgy Methods","authors":"V. Shapovalov, Y. Nikitenko, A. Manulyk, D. Kalashnyk","doi":"10.1557/opl.2016.12","DOIUrl":"https://doi.org/10.1557/opl.2016.12","url":null,"abstract":"Fast-quenched alloys with amorphous and microcrystalline structures were obtained by the cooling drum spinning method during plasma-arc melting process. Thermal load measurements carried out during the melting process and the spinning of the molten material that followed, helped us to modify the existing plasma-arc equipment. Metallographic analyses of the amorphous alloys showed the influence of some quenching process parameters on the creation of their microstructure and revealed the nature of the formation of the crystal structures.","PeriodicalId":18884,"journal":{"name":"MRS Proceedings","volume":"20 1","pages":"17-22"},"PeriodicalIF":0.0,"publicationDate":"2016-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72938892","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
Arborescent Polypeptides for Sustained Drug Delivery 用于持续给药的树状多肽
MRS Proceedings Pub Date : 2016-01-01 DOI: 10.1557/OPL.2016.70
Mosa H. Alsehli, M. Gauthier
{"title":"Arborescent Polypeptides for Sustained Drug Delivery","authors":"Mosa H. Alsehli, M. Gauthier","doi":"10.1557/OPL.2016.70","DOIUrl":"https://doi.org/10.1557/OPL.2016.70","url":null,"abstract":"Polypeptides are receiving increasing attention as building blocks to create nanostructures for biomedical applications. The first goal of this investigation was to explore the influence of the reaction conditions in the synthesis of well-defined dendritic graft (arborescent) polypeptides from amine-terminated poly(γ-benzyl L-glutamate) (PBG) chains. The optimization was carried out in terms of the reaction temperature, solvent, reaction time, and mole ratio of reactants and coupling agents. Size exclusion chromatography served to evaluate the grafting reaction in terms of grafting yield (fraction of side chains coupled with the substrate) and coupling efficiency (fraction of coupling sites consumed on the substrate). The maximum grafting yield and coupling efficiency achieved were 67% and 74%, respectively. These arborescent PBG substrates were subsequently grafted with poly(ethylene oxide) segments forming a hydrophilic shell, to obtain water-dispersible unimolecular micelles useful as delivery vehicles for doxorubicin.","PeriodicalId":18884,"journal":{"name":"MRS Proceedings","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2016-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76753690","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
Effect of Current Density on the Microstructure and Adhesion of Ni-Co/Al 2 O 3 Composite Coatings 电流密度对Ni-Co/ al2o3复合镀层组织及附着力的影响
MRS Proceedings Pub Date : 2016-01-01 DOI: 10.1557/OPL.2016.67
Diana Alejo-Guerra, C. León-Patiño, E. Aguilar-Reyes, José E. Bedolla-Becerril
{"title":"Effect of Current Density on the Microstructure and Adhesion of Ni-Co/Al 2 O 3 Composite Coatings","authors":"Diana Alejo-Guerra, C. León-Patiño, E. Aguilar-Reyes, José E. Bedolla-Becerril","doi":"10.1557/OPL.2016.67","DOIUrl":"https://doi.org/10.1557/OPL.2016.67","url":null,"abstract":"Ni-Co/Al 2 O 3 composites with alumina particles below 0.53 µm in size were electrochemically deposited on carbon steel AISI-O1 substrates. The influence of current density (2, 3, 4 and 5 mA/cm 2 ) on the microstructure and adhesion behavior was investigated. It was found that the micro-hardness of the surface increased in 90% with respect to the plain substrate. SEM examination revealed an increased thickness from 3.7 to 10.7 µm at current density of 2 and 5 mA/cm 2 , respectively. The Co/Ni weight ratio in the coatings was determined by atomic absorption spectroscopy (AAS); the content of Co and Ni at 2 mA/cm 2 were 42.4 %Co and 57.6 %Ni, while at 5 mA/cm 2 were 44.5%Co and 55.5%Ni. The adhesion of the coatings was evaluated qualitatively according to the VDI 3198 norm; in all the cases, the adhesion was more than acceptable since no cracks or detachments were observed in the periphery of the marks. Details on the synthesis and properties of the Ni-Co/Al 2 O 3 composite coatings are presented together with the excellent properties they show despite of their thin thickness.","PeriodicalId":18884,"journal":{"name":"MRS Proceedings","volume":"384 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2016-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80742490","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
Organic additives as antimicrobial agents in thermoplastics compounds 热塑性塑料中用作抗菌剂的有机添加剂
MRS Proceedings Pub Date : 2016-01-01 DOI: 10.1557/OPL.2016.54
D. Tomacheski, M. Pittol, V. Ribeiro, R. Santana
{"title":"Organic additives as antimicrobial agents in thermoplastics compounds","authors":"D. Tomacheski, M. Pittol, V. Ribeiro, R. Santana","doi":"10.1557/OPL.2016.54","DOIUrl":"https://doi.org/10.1557/OPL.2016.54","url":null,"abstract":"Development of polymers with antimicrobial characteristics can avoid deterioration and assist in containing spread of pathogens harmful to human health. This study aimed to compare the antimicrobial and mechanical properties of polymeric matrices containing organic antimicrobial additives. Silver organomodified bentonite (Ag_bentonite) and organochlorine molecule in a masterbatch based polyethylene (Cl_PE) were tested in proportion of 2% in a thermoplastic elastomeric formulation. The polymeric matrices were prepared by melt mixing and evaluated in tensile and antimicrobial properties against Staphylococcus aureus ( S. aureus ) and Escherichia coli ( E. coli) strains . The additives were characterized by thermogravimetric analysis (TGA) and scanning electron microscopy (SEM). The nanoscale of Ag_bentonite was verified by SEM. TGA assay showed that Cl_PE is more sensitive to heat than Ag_bentonite. As a result of this lower thermal stability, the addition of Cl_PE reduced the tensile properties of the compound. The sample with Cl_PE was effective against both bacterial strains, reducing the populations of S. aureus and E. coli in 99 and 96%, respectively. The addition of Ag_bentonite did not affect the tensile strength and decreased in 97 and 40% S. aureus and E. coli populations, respectively. The results indicate that the use of organic additives is promissory, but further modifications in processing must be necessary.","PeriodicalId":18884,"journal":{"name":"MRS Proceedings","volume":"107 S119","pages":""},"PeriodicalIF":0.0,"publicationDate":"2016-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91435674","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
Simulation of Mechanical Elongation and Compression of Nanostructures 纳米结构机械伸长和压缩的模拟
MRS Proceedings Pub Date : 2016-01-01 DOI: 10.1557/OPL.2016.42
S. Mejía-Rosales, Carlos Fernández-Navarro
{"title":"Simulation of Mechanical Elongation and Compression of Nanostructures","authors":"S. Mejía-Rosales, Carlos Fernández-Navarro","doi":"10.1557/OPL.2016.42","DOIUrl":"https://doi.org/10.1557/OPL.2016.42","url":null,"abstract":"","PeriodicalId":18884,"journal":{"name":"MRS Proceedings","volume":"101 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2016-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88392172","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
Morphological and Spectroscopic Studies of Chitin Nanowhiskers 几丁质纳米晶须的形态与光谱研究
MRS Proceedings Pub Date : 2016-01-01 DOI: 10.1557/OPL.2016.46
Violeta Campos-Cornelio, N. Flores-Ramírez, S. R. Vasquez‐Garcia, L. Domratcheva-Lvova, L. García-González
{"title":"Morphological and Spectroscopic Studies of Chitin Nanowhiskers","authors":"Violeta Campos-Cornelio, N. Flores-Ramírez, S. R. Vasquez‐Garcia, L. Domratcheva-Lvova, L. García-González","doi":"10.1557/OPL.2016.46","DOIUrl":"https://doi.org/10.1557/OPL.2016.46","url":null,"abstract":"Chitin nanowhiskers were obtained with the purpose to be used as astaxanthin protectors against the photo and thermal degradation. These nanostructures were generated by a freezing/thawing procedure using two stirring methods: mechanical and sonication, which were named as FTM and FTS respectively. Morphological and spectroscopic studies were carried out on chitin nanowhiskers by scanning electronic microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR). Through a SEM analysis, chitin fibers were found uniformly spaced and oriented with the width ranged from of 20-40 nm. Furthermore, the nanowhiskers obtained by FTM showed long and flattened structures and bundles of homogeneous sizes, which have the capacity of being sites of stress concentration. In contrast, by FTS, the nanowhiskers showed coarse fibers exhibiting numerous peaks. By comparing the two methods is appreciated that FTS method provides more surface area, giving more sites for functionalization. Fourier transform infrared spectroscopy (FTIR) allowed the determination of free movement of functional groups on the surface of samples obtained by FTM and FTS methods. Significant differences of signals in the spectra indicate that there were more unassociated amides in the nanowhiskers obtained by FTS than by FTM.","PeriodicalId":18884,"journal":{"name":"MRS Proceedings","volume":"64 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2016-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87581756","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
Modelling the Complete Molecular Weight Distribution in Chain Growth Polymerizations 链式生长聚合中完全分子量分布的建模
MRS Proceedings Pub Date : 2016-01-01 DOI: 10.1557/OPL.2016.83
Ramiro Infante-Martínez, E. Saldívar‐Guerra, O. Pérez‐Camacho, M. García-Zamora, Víctor E Comparán-Padilla
{"title":"Modelling the Complete Molecular Weight Distribution in Chain Growth Polymerizations","authors":"Ramiro Infante-Martínez, E. Saldívar‐Guerra, O. Pérez‐Camacho, M. García-Zamora, Víctor E Comparán-Padilla","doi":"10.1557/OPL.2016.83","DOIUrl":"https://doi.org/10.1557/OPL.2016.83","url":null,"abstract":"","PeriodicalId":18884,"journal":{"name":"MRS Proceedings","volume":"22 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2016-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84493420","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
Nanostructured LB films developed from poly(p-acryloylaminophenylmethylphosphonic) acid 由聚对丙烯氨基苯基甲基膦酸制备的纳米LB膜
MRS Proceedings Pub Date : 2016-01-01 DOI: 10.1557/OPL.2016.74
Rosa E. Lazo-Jiménez, J. Chávez-Carvayar, A. Herrera-González, Valentin Islas-Pérez, M. Carreón-Castro
{"title":"Nanostructured LB films developed from poly(p-acryloylaminophenylmethylphosphonic) acid","authors":"Rosa E. Lazo-Jiménez, J. Chávez-Carvayar, A. Herrera-González, Valentin Islas-Pérez, M. Carreón-Castro","doi":"10.1557/OPL.2016.74","DOIUrl":"https://doi.org/10.1557/OPL.2016.74","url":null,"abstract":"","PeriodicalId":18884,"journal":{"name":"MRS Proceedings","volume":"136 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2016-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77478775","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
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