Department of Materials

Juan Pablo Hernandez-Ortiz

Associate Professor

·        Address – E-mail

·        Program Affiliations

·        Courses

·        Education

·        Fields of Interest

·        Books

·        Publications

·        Awards, Honors & Societies

·        Summary

·        Extended Homepage 

Contact Information

Universidad Nacional de Colombia,

Sede Medellin. Facultad de Minas

Carrera 80 # 65-223, Bloque M3-050

Medellin, Colombia

Tel: +57 - 4 - 425 5249

Fax: +57 - 4 - 425 5254

E-mail: jphernandezo@unal.edu.co;

            jphernandezo@wisc.edu 

Program Affiliations and Cooperative Institutes

·      Department of Materials

·      Department of Chemical Engineering

·      Department of Chemical and Biological Engineering, Honorary/Associated Fellow, University of Wisconsin-Madison

·      Lehrstuhl für Kunststofftechnik (LKT), Universität Erlangen-Nürnberg

·      Nanoscale Science and Engineering Center (NSEC), University of Wisconsin-Madison

·      Materials Research Science and Engineering Center (MRSEC), University of Wisconsin-Madison

·      Polymer Engineering Center (PEC), Univeristy of Wisconsin-Madison

Courses

Graduate

·        Advanced Thermodynamics for Chemical and Materials Engineering

·        Intermediate Transport Phenomena

·        Advanced Mathematics for Engineers

·        Dynamics of Polymeric Liquids (Continuum and Kinetic Theory)

·        Polymer Processing: Modeling and Simulation

Under-graduate

·        Engineering Design with Polymers

·        An Introduction to Material Science

·        Introductory Transport Phenomena

Short international courses

·        Stochastic Methods for Polymer Solutions: advanced techniques for equilibrium and non-equilibrium systems

·        Mathematical Modeling with Polymeric Liquids

·        Modeling Thermosets and Elastomers: curing and rheology

Education

·      1999, Mechanical Engineering Degree, Universidad Pontificia Bolivariana (UPB), Medellin-Colombia

·      2004, Ph.D. Mechanical Engineering with minor in Chemical Engineering, University of Wisconsin-Madison

·      2004-07, Postdoctoral Department of Chemical and Biological Engineering, University of Wisconsin-Madison

Fields of Interest

·        Statistical mechanics, thermodynamics and fluid Mechanics

·        Beyond equilibrium thermodynamics: GENERIC formulation

·        Complex fluids: confined polymer solutions, concentration effects, long-range interactions,

·        Driven self-Assembly: polyelectrolite solutions, self-propelled particles, liquid crystals, biofluids

·        Rare events far from equilibrium: agglomeration and crystallization, liquid crystal dynamics, protein dynamics

·        Polymer processing and rheology: fiber suspensions, mixing, complex geometries, thermosets

·        General Geometry Ewald-like Method (GGEM)

Book and Book’s Chapters

1. J.P. Hernandez-Ortiz, A. Londono-Hurtado and T.A. Osswald, “Continuous Equipment Simulation − Mixing Devices,” in Mixing and Compounding of Polymers, Editor: I. Manas-Zloczower, 2nd Edition, Hanser Publishers, Munich, 2009.

2. T.A. Osswald and J.P. Hernandez-Ortiz, Polymer Processing − Modeling and Simulation, Hanser Publishers, Munich, 2006

3. J.P. Hernandez-Ortiz, Boundary Integral Equations for Viscous Flows – non-Newtonian Behavior and Solid Inclusions, Ph.D. Thesis, University of Wisconsin-Madison, 2004

Files

Corrigenda

(ver 5.0, Apr-2010)

Ph.D. Thesis

Publications

1.     Anekal, S.G., J.P. Hernandez-Ortiz and M.D. Graham, “Pair collisions of fluid-filled elastic capsules in shear flow: effects of membrane properties and polymer additives,” Phys. of Fluids, to appear 2010

2.     Hernandez-Ortiz, J.P. and T.A. Osswald, “Modeling Processing of Silicone Rubber: Liquid vs. Hard Silicone Rubbers,” J. Appl. Polymer Sci., to appear March 2010

3.     Gettelfinger, B.T., Moreno-Razo, J., Koenig, G.M., Hernandez-Ortiz, J.P., Abbott, N.L. and de Pablo, J.J., “Flow Induced Deformation of Defects around Nanoparticles and Nanodroplets Suspended in Liquid Crystals,” Soft Matter, to appear February 2010

4.     Hernandez-Ortiz, J.P., Chopra, M., Geier, S. and J.J. de Pablo, “Hydrodynamic Effects on the Translocation Rate of a Polymer a Narrow Pore,” J. Chem. Phys., vol. 131, pp. 044904, 2009

5.     Hernandez-Ortiz, J.P., P.T. Underhill and M.D. Graham, “Dynamics of confined suspensions of swimming particles,” J. Phys.: Condensed Matter, vol. 21, pp. 204107, 2009

6.     Hernandez-Ortiz, J. P., Ma, H. de Pablo, J. J. and Graham, M. D., "Concentration distributions during flow of confined flowing polymer solutions at finite concentration: slit and grooved channel", Korea-Australia Rheology Journal, vol. 20(3), pp. 143, 2008

7.     Gettelfinger, B.T., F.R. Hung, J.P. Hernandez-Ortiz, O. Guzman, A.D. Rey, N.L. Abbott and J.J. de Pablo, “Liquid crystal relaxation in three dimensions: The effect of hydrodynamic interactions,” Dyna, vol. 75(156), pp. 185, 2008

8.     Miller, C.A., J.P. Hernandez-Ortiz, N.L. Abbott, S.H. Gellman and J.J. de Pablo, “Dipole-induced self-assembly of helical β-peptides,” Virtual J. Biological Physics Research, vol. 16, Issue 2, July 15^th, 2008

9.     Miller, C.A., J.P. Hernandez-Ortiz, N.L. Abbott, S.H. Gellman and J.J. de Pablo, “Dipole-induced self-assembly of helical β-peptides,” J. Chem. Phys., vol. 129, pp. 015102, 2008

10.  Underhill, P., J.P. Hernandez-Ortiz and M.D. Graham, “Diffusion and spatial correlations in suspensions of swimming particles,” Virtual J. Biological Physics Research, vol. 16, Issue 1, 2008

11.  Underhill, P., J.P. Hernandez-Ortiz and M.D. Graham, “Diffusion and spatial correlations in suspensions of swimming particles,” Phys. Rev. Lett., vol. 100, pp. 248101, 2008

12.  Hernandez-Ortiz, J.P., J.J. de Pablo and M.D. Graham, “Fast computation of many-particle hydrodynamic and electrostatic interactions in a confined geometry,” Phys. Rev. Lett., vol. 98, pp. 140602, 2007

13.  Londono-Hurtado, A., J.P. Hernandez-Ortiz and T.A. Osswald, “Mechanism of fiber-matrix separation in ribbed compression molded parts,” Polymer Composites, vol. 28(4), pp. 451, 2007

14.  Lopez, L.M., A.B. Cosgrove, J.P. Hernandez-Ortiz and T.A. Osswald, “Modeling the vulcanization of silicone rubber,” Polym. Eng. Sci., vol. 47(5), pp. 675, 2007

15.  Hernandez-Ortiz, J.P., H. Ma, J.J. de Pablo and M.D. Graham, “Migration of confined flowing polymer solutions: Theory and Simulation,” Phys. Fluids, vol. 18, pp. 123101, 2006

16.  Hernandez-Ortiz, J.P., J.J. de Pablo and M.D. Graham, “NlogN Fourier based method for hydrodynamic interactions in confined polymer solutions,” J. Chem. Phys., vol. 125, pp. 164906, 2006

17.  Hernandez-Ortiz J.P., C. Stoltz and M.D. Graham, “Transport and col lective dynamics in suspensions of confined swimming particles,” Phys. Rev. Lett., vol. 95, pp. 204501, 2005

18.  Hernandez-Ortiz, J.P. and T.A. Osswald, “A novel cure reaction model fitting technique based on DSC scans,” J. Polym. Engineering, vol. 25(1), pp. 23, 2004

19.  Hernandez, J.P., T. Raush, A. Rios, S. Strauss and T.A. Osswald, “Theoretical analysis of fiber motion and loads during flow,” Polymer Composites, vol. 25(1), pp. 1, 2004

20.  Hernandez, J.P., T.A. Osswald and D. A. Weiss, “Simulation of viscous 2D-planar cylindrical geometry deformation using DR-BEM,” Int. J. Num. Meth. Heat Fluid Flow, vol. 13, pp. 698, 2003

21.  Hernandez, J.P., T. Raush, A. Rios, S. Strauss and T.A. Osswald, “Analysis of fiber damage mechanisms during processing of reinforced polymer melts,” Eng. Analysis Boundary Elements, vol. 26, pp. 621, 2002

22.  Chejne, F. and J.P. Hernandez, “Modeling and simulation of coal gasification process in fluidized bed,” FUEL, vol. 81, pp. 1687, 2002

23.  Chejne, F., W. Florez, T. Ragimova and J.P. Hernandez, “Theoretical model for heat transfer in the single crystal making,” Revista Facultad de Ingenieria, U. de A., vol. 26, pp. 79, 2003

24.  Chejne, F., J.P. Hernandez, W. Florez and A.F. Hill, “Modeling and simulation of time-dependent coal combustion processes in stacks,” FUEL, vol. 79, pp. 987, 2000

Awards, Honors & Societies

·        ENSINGER-Preis 2005 (Ph.D. thesis). Entwicklung und Beschreibung Technischer Kunststoffe fuer Innovative Anwendungen, Wissenschaftlichen Arbeitskreises Kunststofftechnik (Thesis selected as the best plastics technology Ph.D. thesis of 2004-2005 by the Scientific Allience of Plastics Technology − WAK, an European association of plastics technology professors), Germany.

·        QUADRANT Award 2005 (Ph.D. thesis). International Award for Academic Excellence in Engineering Plastics and Composites, Quadrant AG, Switzerland.

·        PLACON Award 2004-05. Best Student Seminar, Rheology Research Center, University of Wisconsin-Madison.

·        Research Project of the Year-1998, Ciencia y Tecnologıa de Antioquia, COLCIENCIAS (Colombian National Science Foundation), Development of a mathematical model to simulate coal gasification process in fluidized bed, Colombia.

·        Editorial board: Journal of Plastic Technology, Hanser, WAK, Germany

·        Editor: DYNA, Facultad de Minas, Universidad Nacional de Colombia

·        American Physical Society (APS): Division of Fluid Dynamics (DFD), Division of Polymer Physics (DPP)

·        American Institute of Chemical Engineers (AiChE)

·        The Society of Rheology (SOR)

Summary

The principal purpose of my group is to study confined multi-phase systems, such as polymer solutions, liquid crystals and suspensions, far from equilibrium. In particular, we seek to analyze how dissipative fields, e.g. flow and/or electric fields, can be used to drive or manipulate the self-assembly of confined complex fluids. The opportunity resides in the fact that a comprehensive analysis of these problems requires the combination of fluid mechanics, transport and rheology with statistical mechanics, molecular modeling, polymer and complex-fluid physics.

In order to be able to simulate these systems novel techniques must be developed and combined, it is therefore an interest of my group to developed advanced techniques to include all the important interactions for complex multi-phase non-equilibrium systems.

Please go to our Extended Homepage for a more extensive description of our current research interests.