Se buscan un(a) estudiante para:
Taller de Diseño / Práctica Dirigida: I SEM 2020
con el tema:
“Electrophoretic deposition (EPD) fundaments based on organic/inorganic composite coatings”
Electrophoretic deposition (EPD) continues to receive increasing attention by the materials research community and a wide range of new applications of the technique in the processing of traditional and advanced materials is emerging [1,2]. The interest in EPD is based not only on its high versatility to be used with different materials and combinations of materials but also because EPD is a cost-effective technique usually requiring simple equipment. Moreover EPD has a high potential for scaling up to large product sizes and it can be adapted to a variety of device and component shapes[3].
EPD is usually carried out in a two electrode cell, as schematically shown in Fig. 1a. The mechanism of EPD is based in the motion of charged particles dispersed in a liquid (electrophoresis) towards an electrode under an applied electric field. The solid deposit formation and growth on the electrode occurs via particle coagulation (Fig. 1b) [1,2]. In order to apply EPD to process materials, a stable suspension containing charged solid particles free to move when an electric field is applied is required. EPD can be applied to a great variety of materials available in the form of fine powders (e.g. < ~ 30 μm particle size) or as colloidal suspensions. Metals, polymers, ceramics, glasses and their composites can be deposited by EPD[4]. The application of EPD to manipulate nanoparticles and carbon nanotubes is gaining increasing attention [1,2].
Objetivos
Durante el desarrollo del proyecto el/los estudiantes se encargaran de:
- Poner en marcha una celda de EPD.
- Desarrollar suspensiones coloidales para EPD y análsis de las mismas a través de estudios de estabilidad (potencial-zeta).
- Desarrollar recubrimientos orgánicos/inorgánicos a través de EPD sobre substratos para implantes.
- Caracterizar los recubrimientos utilizando diversas técnicas: SEM/EDS, AFM, FTIR, TGA, DSC, XRD, OCP, EIS, PC.
Requisitos
El estudiante deberá contar con:
- Adecuado nivel de inglés (mínimo B1).
- No llevar más de tres curso durante el I SEM 2020.
- Preferiblemente (pero no indispensable) tener conocimentos de técnicas de caracterización.
- Capacidad de trabajo independiente, pensamiento analítico y motivación.
El estudiante debe mandar su CV.
Lugar
Las actividades serán desarrolladas en la ECIM así como en colaboración con el Laboratorio Nacional de Nanotecnología (LANOTEC, Pavas).
Contacto (Supervisor)
Prof. Luis Edo. Cordero Arias, lcordero@tec.ac.cr
Referencias
[1] L. Besra, M. Liu, A review on fundamentals and applications of electrophoretic deposition (EPD), Prog. Mater. Sci. 52 (2007) 1–61. doi:10.1016/j.pmatsci.2006.07.001.
[2] O.O. Van der Biest, L.J. Vandeperre, Electrophoretic deposition of materials, Annu. Rev. Mater. Sci. 29 (1999) 327–352. http://www.scopus.com/inward/record.url?eid=2-s2.0-0041581151&partnerID=....
[3] A.R. Boccaccini, I. Zhitomirsky, Application of electrophoretic and electrolytic deposition techniques in ceramics processing, Curr. Opin. Solid State Mater. Sci. 6 (2002) 251–260. doi:10.1016/S1359-0286(02)00080-3.
[4] A.R. Boccaccini, S. Keim, R. Ma, Y. Li, I. Zhitomirsky, Electrophoretic deposition of biomaterials, J. R. Soc. Interface. 7 Suppl 5 (2010) S581-613. doi:10.1098/rsif.2010.0156.focus.
[5] F. Pishbin, L. Cordero-Arias, S. Cabanas-Polo, A.R. Boccaccini, Bioactive polymer-calcium phosphate composite coatings by electrophoretic deposition (EPD), in: C. Wen (Ed.), Surf. Coat. Modif. Met. Biomater., 1st ed., Woodhead Publishing Limited, 2015. doi:http://dx.doi.org/10.1016/B978-1-78242-303-4.00012-0.
[6] L. Cordero-Arias, S. Cabanas-Polo, S. Virtanen, A.R. Boccaccini, Electrophoretic Deposition of Nanostructured Titania-Bioactive Glass/Alginate Coatings on Stainless Steel, Key Eng. Mater. 654 (2015) 159–164. doi:10.4028/www.scientific.net/KEM.654.159.