Revista Facultad De Ingenieria-universidad De Antioquia最新文献_第9页

Polycaprolactone- Chitosan- Ag coatings on Ti6Al4V: Critical synergic aspects analyzed by Raman, EFM and contact angle 用拉曼光谱、EFM和接触角分析了Ti6Al4V表面聚己内酯-壳聚糖- Ag涂层的关键协同作用

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Revista Facultad De Ingenieria-universidad De Antioquia Pub Date : 2018-10-09 DOI: 10.17533/UDEA.REDIN.N89A08

S. Leal-Marin, H. Estupiñán-Duran

{"title":"Polycaprolactone- Chitosan- Ag coatings on Ti6Al4V: Critical synergic aspects analyzed by Raman, EFM and contact angle","authors":"S. Leal-Marin, H. Estupiñán-Duran","doi":"10.17533/UDEA.REDIN.N89A08","DOIUrl":"https://doi.org/10.17533/UDEA.REDIN.N89A08","url":null,"abstract":"The Ti6Al4V presented a natural oxide layer that increased the corrosion resistance of the material but decreased the physicochemical compatibility with the bone tissue. The use of polymeric coatings on Ti6Al4V allows the creation of an interface that promotes osseointegration and antibacterial activity. The objective of this work was to analyze a coating on Ti6Al4V obtained by dip-coating with a mixture of chitosan, polycaprolactone, and silver. The synergy between chitosan and silver allows the polymeric matrix to be retained and to enhance the coating’s mechanical-structural functions, integrating bone cells and serving as antibacterial agents. Coating morphology was assessed by scanning electron microscopy (SEM) and the distribution of chemical elements was determined by energy dispersive spectroscopy (EDS). Confocal Raman spectroscopy was used to evaluate the composition and structure of the coating. Electrical potential distribution, phase distribution and surface topography of surfaces were analyzed using an electrostatic force microscopy. Contact angle measurements were also performed to determine coating wettability.","PeriodicalId":21428,"journal":{"name":"Revista Facultad De Ingenieria-universidad De Antioquia","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2018-10-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89549459","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

Small-signal stability analysis of DC microgrids considering electric vehicles 考虑电动汽车的直流微电网小信号稳定性分析

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Revista Facultad De Ingenieria-universidad De Antioquia Pub Date : 2018-10-03 DOI: 10.17533/UDEA.REDIN.N89A07

A. Garcés-Ruiz

引用次数: 4

Study of the influence of cobalt in the high formability of the Au-Fe system 研究了钴对Au-Fe体系高成形性的影响

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Revista Facultad De Ingenieria-universidad De Antioquia Pub Date : 2018-10-02 DOI: 10.17533/UDEA.REDIN.N89A02

Sandra Milena Restrepo-Arcila, Alejandro Iván Echavarría-Velásquez, Héctor Darío Sánchez-Londoño, Marco Antonio Giraldo-Cadavid

{"title":"Study of the influence of cobalt in the high formability of the Au-Fe system","authors":"Sandra Milena Restrepo-Arcila, Alejandro Iván Echavarría-Velásquez, Héctor Darío Sánchez-Londoño, Marco Antonio Giraldo-Cadavid","doi":"10.17533/UDEA.REDIN.N89A02","DOIUrl":"https://doi.org/10.17533/UDEA.REDIN.N89A02","url":null,"abstract":"Since ancient times, gold has been used due to its especial properties. Among those properties are the resistance to corrosion (for being noble), its high electrical and thermal conductivity, and also its conspicuous coloration. Gold has been applied in a diversity of subjects such as economy, jewelry, electronic circuits and odontology. The fascinating properties of gold are likely to improve with the preparation of alloys; among those, the Au-Fe alloys constitute some of the most studied nowadays. In this research, we present our results concerning the microstructure of the Au-Fe and Au-Fe-Co alloys. We fabricated gold based alloys with 25% (weight) Fe and then compared their structure and formability to Au-24.5Fe-0.5Co (% weight) to determine the role of cobalt in the alloy. An induction furnace with controlled atmosphere (argon) and conductor crucibles coated with zirconium silicate was used. The samples were characterized by three processes: as-cast , with heat treatment (HT) at T=900°C (1h and 3h) and as-cast centrifuged .","PeriodicalId":21428,"journal":{"name":"Revista Facultad De Ingenieria-universidad De Antioquia","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2018-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80534938","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

New chitosan-imine derivatives: from green chemistry to removal of heavy metals from water 新型壳聚糖亚胺衍生物:从绿色化学到去除水中重金属

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Revista Facultad De Ingenieria-universidad De Antioquia Pub Date : 2018-10-02 DOI: 10.17533/UDEA.REDIN.N89A05

Vivian Lizeth Triana-Guzmán, Yury Ruiz-Cruz, Elkin Libardo Romero-Peñaloza, Héctor Fabio Zuluaga-Corrales, Manuel Noé Chaur-Valencia

{"title":"New chitosan-imine derivatives: from green chemistry to removal of heavy metals from water","authors":"Vivian Lizeth Triana-Guzmán, Yury Ruiz-Cruz, Elkin Libardo Romero-Peñaloza, Héctor Fabio Zuluaga-Corrales, Manuel Noé Chaur-Valencia","doi":"10.17533/UDEA.REDIN.N89A05","DOIUrl":"https://doi.org/10.17533/UDEA.REDIN.N89A05","url":null,"abstract":"Three novel imine-chitosan derivatives were synthesized by condensation of the amino terminals of chitosan and 4-bromomethyl-2-hydroxybenzaldehyde A1, 4-formyl-2-hydroxybenzoic acid A2, and (E)-6-((2-(pyridin-2-yl)hydrazono)methyl)picolinaldehyde A3. Noteworthy, is the aqueous synthesis of imine-chitosan compounds using relatively mild conditions (70 °C) in a green chemistry fashion. The new compounds were characterized by 1H-NMR, FT-IR, elemental analysis, thermal gravimetric analysis (TGA), and differential scanning calorimetry (DSC). A solubility study at different pH values was performed for the three compounds, obtaining very different behaviors when compared to that of the pristine chitosan. Finally, by means of atomic absorption the ability to remove heavy metal ions, such as Pb(II) and Hg(II), was investigated for the imine-chitosan derivatives, which showed a high removal percentage at basic pH (between 8-10) but low removal percentage at pH lower than 5. Additionally, the nature of the substituent determines the solubility of the resulting adducts thus widening the potential applications of chitosan derivatives.","PeriodicalId":21428,"journal":{"name":"Revista Facultad De Ingenieria-universidad De Antioquia","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2018-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79163496","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

Kinetics of nopyl acetate synthesis by homogeneously catalyzed esterification of acetic acid with nopol 均相催化醋酸与nopol酯化合成nopyl乙酸的动力学

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Revista Facultad De Ingenieria-universidad De Antioquia Pub Date : 2018-10-02 DOI: 10.17533/UDEA.REDIN.N89A03

Aída Luz Villa-Holguín, Eliana Paola Hurtado-Burbano

{"title":"Kinetics of nopyl acetate synthesis by homogeneously catalyzed esterification of acetic acid with nopol","authors":"Aída Luz Villa-Holguín, Eliana Paola Hurtado-Burbano","doi":"10.17533/UDEA.REDIN.N89A03","DOIUrl":"https://doi.org/10.17533/UDEA.REDIN.N89A03","url":null,"abstract":"The esterification of nopol with acetic acid to produce nopyl acetate using sulfuric acid as homogeneous catalyst was studied. The reactions were carried out in a batch reactor, at different temperatures (50, 60, 70 and 80 °C), catalyst concentrations (0.0184, 0.0275, 0.0367 and 0.0480 mol L -1 ) and molar ratio of acetic acid to nopol (1: 1, 1:2, 1:3 and 1: 4); the chemical equilibrium composition was measured at those reaction conditions. It was found that the equilibrium composition is a weak function of temperature, equilibrium conversion was 63, 68, 71 and 75% at 50, 60, 70 and 80°C, respectively. The reaction was described with a simple power-law model with a second-order kinetic model for both the forward and the backward reaction, using concentration and activities which were predicted by the Universal Functional group Contribution (UNIFAC) method for considering non-ideal behavior of the liquid phase. The forward reaction rate and the equilibrium constants increased with temperature; the relation of the pre-exponential factor with the catalyst amount was evaluated. The activation energy and pre-exponential factor estimated for the forward reaction using the kinetic model based on concentration, were respectively, 28.08 kJ mol -1 and 11126 L mol -1 h -1 with a concentration of catalyst of 0.0275 M. Using the kinetic model based on activities, the forward reaction rate constant was 28.56 kJ·mol -1 and the k fo,act was 33860 L mol -1 h -1 . The enthalpy (34.90 kJ mol -1 ) and the entropy (0.12 kJ mol -1 K -1 ) of reaction were determined using van’t Hoff equation.","PeriodicalId":21428,"journal":{"name":"Revista Facultad De Ingenieria-universidad De Antioquia","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2018-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75180544","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

Corrosion protection in saline environment of a carbon steel coated (aluminum & three-layer painting system) by eats 碳钢涂层(铝&三层涂漆系统)的盐水环境腐蚀防护

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Revista Facultad De Ingenieria-universidad De Antioquia Pub Date : 2018-10-02 DOI: 10.17533/udea.redin.n89a04

D. Pérez-Muñoz, J. Marulanda-Arévalo, C. Moreno-Téllez

{"title":"Corrosion protection in saline environment of a carbon steel coated (aluminum & three-layer painting system) by eats","authors":"D. Pérez-Muñoz, J. Marulanda-Arévalo, C. Moreno-Téllez","doi":"10.17533/udea.redin.n89a04","DOIUrl":"https://doi.org/10.17533/udea.redin.n89a04","url":null,"abstract":"This paper presents a comparative study on corrosion protection of low-carbon steel coated with two different painting systems. The first set of samples was coated with an aluminum layer of primer deposited by Electric Arc Thermal Spray (EATS), after which two additional layers of paint were applied, thereby creating an aluminum-painting system; while the second set of samples was coated with the traditional three-layer painting system (zinc-rich layer of primer). Afterwards, all the samples were exposed to the salt spray chamber. The samples were monitored to record their reactions in the corrosive saline environment. Scanning Electron Microscopy (SEM), adhesion and electrochemical corrosion tests were performed to characterize the coatings and report changes in their properties (adhesion, topography and homogeneity), which are related to exposure time. The three-layer painting system barely complied with manufacturer claims on protection time under corrosive conditions; on the other hand, the aluminum-painting system yielded better results by prolonging protection time.","PeriodicalId":21428,"journal":{"name":"Revista Facultad De Ingenieria-universidad De Antioquia","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2018-10-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76729962","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

Modeling and control of processes using the EMSO simulator and SIMATIC PLC as OPC inter-face 采用EMSO模拟器和SIMATIC PLC作为OPC接口对过程进行建模和控制

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Revista Facultad De Ingenieria-universidad De Antioquia Pub Date : 2018-06-19 DOI: 10.17533/UDEA.REDIN.N87A08

Jonathan Ospino-Pinedo, M. Sánchez, L. G. Matallana-Pérez

引用次数: 1

Manufacture of titanium dioxide scaffolds for medical applications 医用二氧化钛支架的制造

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Revista Facultad De Ingenieria-universidad De Antioquia Pub Date : 2018-05-20 DOI: 10.19053/01211129.V27.N48.2018.8017

G. Cuervo-Osorio, Ana María Jiménez-Valencia, Cristian Mosquera-Agualimpia, Diana Marcela Escobar-Sierra

{"title":"Manufacture of titanium dioxide scaffolds for medical applications","authors":"G. Cuervo-Osorio, Ana María Jiménez-Valencia, Cristian Mosquera-Agualimpia, Diana Marcela Escobar-Sierra","doi":"10.19053/01211129.V27.N48.2018.8017","DOIUrl":"https://doi.org/10.19053/01211129.V27.N48.2018.8017","url":null,"abstract":"The skeletal system is vulnerable to injuries and bone loss over the years, making the use of autologous or allogeneic implants necessary. However, these implants have complications, such as the limited amount of bone to be extracted and the cell death at the extraction site; hence, biomaterials have been developed as platforms for cell growth (scaffolds). Biomaterials and bones have similar properties that facilitate the integration between the material and the bone tissue, helping the tissue to regenerate. Traditional ceramic implants are hydroxyapatite, but given their low mechanical properties, they have been replaced with better inert ceramics. Therefore, this study aims at manufacturing titanium dioxide scaffolds through various techniques, using collagen, polyvinyl alcohol (PVA), sodium chloride, and corn flour as binders to influence pore size. Scaffolds were characterized by a Scanning Electron Microscope (SEM) and evaluated by compression and degradability tests in a Simulated Body Fluid (SBF). The prepared scaffolds had mechanical behaviors with ranges within the bone parameters; among them, the scaffold obtained by infiltration with 10% PVA presented values of compression strength (6.75 MPa), elastic modulus (0.23 GPa), and porosities (54-67%) closer to the values of the trabecular bone.","PeriodicalId":21428,"journal":{"name":"Revista Facultad De Ingenieria-universidad De Antioquia","volume":null,"pages":null},"PeriodicalIF":1.0,"publicationDate":"2018-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84274329","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

Effect of copper-enriched layers on localized corrosion of aluminium-copper alloys 富铜层对铝铜合金局部腐蚀的影响

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Revista Facultad De Ingenieria-universidad De Antioquia Pub Date : 2018-05-20 DOI: 10.19053/01211129.V27.N48.2018.8016

María Ángeles Arenas-Vara, P. Skeldon, S. Garcia‐Vergara

引用次数: 2

Herramientas de software matemático para la enseñanza de números complejos 用于复数教学的数学软件工具

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Revista Facultad De Ingenieria-universidad De Antioquia Pub Date : 2018-05-20 DOI: 10.19053/01211129.V27.N48.2018.8403

Brayan Esguerra-Prieto, Natalia González-Garzón, Alberto Acosta-López

引用次数: 2