路易斯

发稿时间:2018-11-12浏览次数:1774

Luis De Los Santos Valladares (中文名:路易斯)

Gender: Male
Title: Professor
Work Unit: Materials Science and Engineering, Northeastern University, Shenyang, China.
Phone: 13591657401
Email: 3407549206@qq.com
 
Prof. Luis De Los Santos Valladares is affiliated at the Materials Science and Engineering School of the Northeastern University, Shenyang, China and the University of Cambridge, UK. He specializes in the preparation processes, characterization and applications of different functional and nanomaterials. He has peer reviewed in different specialized journals, given talks at many conferences and Universities around the world and has evaluated many dissertations and projects. He is founder and organizer of the Latinamerican Conference on Superconductivity in Magnetism which held periodically in different Latinamerican Countries.
 
Main research directions:
 
1.- Thermal crystallization and oxidation of metal surfaces:
Intensive study is required to elucidate better the initial stages, mechanism and simultaneous process of crystallization and oxidation of single-element films and nanostructures. Noble metals can help us in the study of thermal crystallization without oxidation and also with surface diffusion effect. Recently I have studied the crystallization process of noble metals (such as Ag and Au) and found that the thermal crystallization of Ag (111) films is quite similar to that of Au (111) films (forming islands) but with a clear rearrangement of the Ag crystallites in the (200) orientation at elevated temperatures (above 850 ºC). I have also studied the change on physical properties with the evolution of crystallization and oxidation in some transition metals (such as Cu), magnetic metal (such as Fe, Co and Ni) and semiconductors (Ge and Si). Further studies are required to correlate the different physical properties (magnetic, electric, optical, etc.) with the type of materials. This information is helpful for improving protective and corrosion of metal surfaces.
 
2.- Cost effective and green metallic building materials
This project will use powders produced by processing recycled cast iron and steel machining chips, recycled aluminum alloy machining chips, reduced iron powder and other low cost powders such as graphite and master alloy powders as raw materials, and employ a novel powder metallurgy approach to turn the raw materials into steel wires and rebars and aluminum alloy extrusions used in building industry. The aim of the project is to develop a technology which can be used to mass produce metallic building materials at a significantly lower cost (by >30%) and with a significantly lower energy consumption (by >30%) than their counterparts produced using conventional technologies. The mechanical properties of the new metallic building materials will be equivalent or superior to their counterparts produced using conventional technologies. This is a collaborative project between NEU (China) and UNAB (Peru).
 
3.- Applications of iron oxide nanostructures
This project aims in the preparation and characterization of different iron oxides nanostructures and test their catalytic and delivery properties. Within the last years many studies have been performed by different research groups for the applications of iron oxide nanoparticles in environmental and medical applications. Partial progress has been achieved, mainly in understating the catalytic properties of these materials. This project investigates the relation between the magnetic, structural and catalytic properties of iron oxide nanoparticles with different morphologies and composition. Special interest will be given in hollow iron oxide nanostructures.
 
Some main publication in the last 5 years:
A complete list of publications can be found at:
https://scholar.google.co.uk/citations?user=JQmAULsAAAAJ&hl=en
 

  1. L. de los Santos Valladares, D.G. Mukhambetov, J.B. Kergin, A.L. Kozlovskiy, “Influence of space charge during the oxidation of metal surfaces”, Oxid. Met. 90 (2018) 515-526.

  2. L. de los Santos Valladares, L. León Félix, J.A.H Coaquira, M.A.R. Martínez, G.F. Goya, J. Mantilla, M.H. Souza, C.H.W. Barnes, P.C. Morais,"Structural and magnetic properties of core-shell Au/Fe3O4 nanoparticles", Scientific Reports (Nature Publishing) 7 (2017) 41732.

  3. L. de los Santos Valladares, A. Bustamante Domínguez, A. ionescu, A. Brown, A. Sepe, U. Steiner, O. Avalos Quispe, S. Holmes, Y. Majima, R. Langford, C.H.W. Barnes, "Thermal oxidation of amorphous germanium thin films on SiO2 subtrates", Semiconductors Science and Technology 31 (2016) 125017.

  4. (Chapter book) L. De Los Santos Valladares, L. León Félix, S.M. Espinoza Suárez, A.G. Bustamante Domínguez, S. Holmes, T. Mitrelias, J. Albino Aguiar, C.H.W. Barnes, "Hollow hematite microspheres obtained without hard templates", in Nanotechnology in Drug Delivery, Chapter 5, edited by Salam Massadeh, ISBN 978-1-910086-13-1, 2016.

  5. L. De Los Santos Valladares, L. León Félix, S.M. Espinoza Suárez, A.G. Bustamante Domínguez, T. Mitrelias, S. Holmes, N.O. Moreno, J. Albino Aguiar, C.H.W. Barnes, "Preparation and crystallization of hollow α-Fe2O3 microspheres following the gas-bubble template method", Materials Chemistry and Physics 169 (2016) 21-27.

  6. (Chapter Book) L. De Los Santos Valladares, J.C. González, A. Bustamante Domínguez, A.M. Osorio Anaya, H. Sanchez Cornejo, S. Holmes, J. Albino Aguiar, C.H.W. Barnes, "A fluorine-free oxalate route for the chemical solution deposition of YBa2Cu3O7 films" in Superconductors, edited by Alexander Gabovich, ISBN 978-953-51-4163-1. Intech, Chapter 3, 2015, pp 35-53.

  7. L. De Los Santos Valladares, A. Ionescu, S.Holmes, C.H.W. Barnes, A. Bustamante Domínguez, O. Avalos Quispe, J.C. González, S. Milana, M. Barbone, A.C. Ferrari, H. Ramos, Y. Majima, "Characterization of Ni thin films following thermal oxidation in air", Journal of Vacuum Science and Technology B 32 (2014) 051808.

  8. L. De Los Santos Valladares, A. Bustamante Dominguez, J. Llandro, S. Holmes, O. Avalos Quispe, R. Langford, J. Albino Aguiar, C.H.W. Barnes, "Surface morphology of amorphous germanium thin films following thermal outgassing of SiO2/Si substrates" Applied Surface Science 316 (2014) 15-21.

  9. (Book Chapter) L. De Los Santos Valladares, A. Bustamante Domínguez, T. Mitrelias, C.H.W. Barnes, J. Albino Aguiar, Y. Majima, “Fabrication of Nanogap electrodes by electroless- and electrodeposition”, in Vistas in Nanofabrication, Chapter 8, Edited by Faiz Rahman, ISBN 978-981-4364-56-0, Pan Stanford Publishing Pte. Ltd., 2012.

  10. L. De Los Santos Valladares, A. Bustamante Dominguez, R. Bellido Quispe, W. Flores Santibañez, J. Albino Aguiar, C.H.W. Barnes, Y. Majima, “The irreversibility line and Curie-Weiss temperature of the superconductor LaCaBaCu3-x(BO3)xO7 with x=0.2 and 0.3”, Physics Procedia 36 (2012) 254-359.