Professor of Chemical and Biomolecular Engineering and Chemistry
Microstructured liquids. Free surface flows. Computational modeling of process flows. Visualization of flowing single DNA molecules. Rheology and phase behavior of Single-Walled Carbon Nanotubes. Rheology and microstructure of Polymeric Nanoparticles (particoils). Single-molecule behavior of semiflexible macromolecules.Pasquali's unifying research theme is the interaction of flow and liquid micro- and nano-structure. Most engineered materials are formed and/or processed in the liquid state; they are complex fluids because they possess intrinsic lengthscales that are well-separated from the macroscopic length scales of the process (usually tens of micrometers to meters) and the nanoscopic length scales of the solvent (usually smaller than one nanometer). For example, in polymer solutions and melts the intrinsic length scale is the length of the polymer (usually hundreds of nanometers to few micrometers), which is well separated from the finer length scales (solvent diameter in solution, polymer diameter in melts). The large scale microstructural features relax on timescales that overlap the flow time scales; thus, the dynamic morphology can differ dramatically from the equilibrium one, and this changing morphology affects the flow and produced intriguing nonlinear dynamical phenomena that are not observed in flowing liquids of low-molecular weight. Students and postdoctoral researchers advised by Pasquali are studying how flexible (polystyrene, long DNA) and semiflexible (PBZT, actin) polymer molecules interact with the flow at the molecular level by applying high-resolution fluorescence microscopy, mechanical rheometry in shear and extension, and non-equilibrium Brownian Dynamics. By rheometry, neutron and light scattering, AFM, TEM, and molecular modeling, Pasquali's colleagues (collaboration with Wong) are analyzing how the degree of intramolecular crosslinking affects the solution and flow behavior of polymer nanoparticles, controlling the transition from particles to coils (particoils). Detailed single-cell mechanics models are being developed based on nonlinear viscoelasticity and massively parallel finite element computations to understand how flow affects the stress field on the cell membrane affects cell growth, in an effort to controlling the in-vitro growth of biomaterials (collaboration with Zygourakis). Such models are being coarsened for application to studying hemolysis in medical devices such as blood pumps (collaboration with Behr). The behavior of Single-Walled NanoTubes in superacids and other liquids is being studied by mechanical rheometry, high resolution optical microscopy, and scattering, in an effort to design optimal liquid crystalline solutions that can be used to successfully spin macroscopic, continuous fibers consisting of SWNTs alone (collaboration with Smalley). The molecular models that are being developed and applied to understand single-molecule behavior of macromolecular solutions (from flexible to nearly rigid, as in SWNTs) are being coarsened through projection techniques based on an extension of local equilibrium thermodynamics in order to develop equations for expectation values of microstructural features of flowing macromolecular liquids; the coarse-grained models are used in massively-parallel finite-element codes for modeling, analyzing, and optimizing processes on larger length scales-from microfluidics (micrometers), to coating and ink-jet printing (tens to hundreds of micrometers), to polymer processing (hundreds of micrometers to millimeters and beyond).My research focuses on processing flows of microstructured liquids. Micro-structured liquids are ubiquitous in the chemical, polymer processing, coating, food, and biomedical industries. Theoretical and computational modeling of flow and transport in microstructured liquids will be a very important tool to design new processes and apparatus that can produce defect-free products at high rate with minimal environmental impact. Prof. Pasquali’s research interest revolve around understanding the interaction of flow and micro-structure in complex fluids, with application to the processing of multifunctional materials, particularly those based on Single-Walled Carbon Nanotubes (SWNTs). Specific problems of interest include: dispersion and liquid crystalline behavior of SWNTs in superacids; spinning of SWNT fibers; coating of transparent, conductive SWNTs films; behavior of individual SWNTs in liquids; entrapment of SWNTs into biocompatible micelles; behavior of SWNTs in confined environments; interaction of flow with flexible and semiflexible molecules; mechanics of blood cells to understand and control hemolysis in blood pumps; modeling complex flows of complex fluids across length scales.
Prof. Matteo Pasquali has been at Rice University since 2000, where he is currently a Professor of Chemical & Biomolecular Engineering and Chemistry; he directs a laboratory working on complex and nanostructured fluids. Before joining Rice, Prof. Pasquali earned a PhD in Chemical Engineering at the University of Minnesota, with a thesis on modeling of free surface flows of polymer solutions, and worked as a postdoc on the dynamics of semiflexible polymers. Prof. Pasquali co-directed the Rice Carbon Nanotechnology Laboratory from 2005 to 2008.
M. Behbahani, M. Behr, M. Hormes, U. Steinseifer, D. Arora, O. M. Coronado, M. Pasquali, A
Review of Computational Fluid Dynamics Analysis of Blood Pumps. Eur. J. Appl. Math., accepted
G. Guidoboni, R. Glowinski, M. Pasquali, Operator Splitting for the numerical solution of free
surface flow at low capillary numbers. J. Comput. Appl. Math., (2008), available online at
V. A. Davis and M. Pasquali Macroscopic Fibers of Single-Walled Carbon Nanotubes. Nanoengineering of Structural Functional and Smart Materials May 2004
M. Bajaj, J. R. Prakash, M. Pasquali, A computational study of the effect of viscoelasticity on slot coating flow of dilute polymer solutions. J. Non-Newtonian Fluid Mech., 149, p. 104-123 (2008).
J. G. Duque, M. Pasquali, Howard K. Schmidt, Antenna Chemistry with Metallic Single-Walled Carbon
Nanotubes. J. Amer. Chem. Soc., 130, 15340�15347, (2008)
M. J. Mendes, H. K. Schmidt, and M. Pasquali Brownian Dynamics Simulations of Single-Wall Carbon
Nanotube Separation by Type using Dielectrophoresis. J. Phys. Chem. B, 112, 7467-7477, (2008).
N. Behabtu, M. J. Green and M. Pasquali, Carbon Nanotube-based neat fibers. Nano Today, 3, 24�34,
(2008). [invited review article].
M. Bajaj, M. Pasquali, and J. Ravi Prakash, Coil-Stretch Transition and the Break Down of Continuum Models. J. Rheol., 52, p. 197�223 (2008)
P. P. Bhat, O. A. Basaran, and M. Pasquali, Dynamics of viscoelastic liquid filaments: low capillary number flows. J. Non-Newtonian Fluid Mech., 150, p. 211-225 (2008).
A. Mohan, A. B. Kolomeisky, and M. Pasquali, Effect of charge distribution on the translocation of an
inhomogeneously charged polymer through a nanopore. J. Chem. Phys., 128, 125104 (2008). (Also
included in the Virtual Journal of Nanoscale Science & Technology).
C. L. Pint, Y.Q. Xu, M. Pasquali, and R. H. Hauge, Formation of highly dense aligned ribbons and transparent films of single-walled carbon nanotubes directly from carpets. ACS Nano, 2, 1871�1878,(2008).
R. Duggal, P. Sunthar, J. Ravi Prakash, and M. Pasquali, Multi-scale Simulation of Dilute DNA in a
Roll-knife Coating Flow. J. Rheol., 52, 1405�1425, (2008).
J. G. Duque, L. Cognet, A. N. G. Parra-Vasquez, N. Nicholas, H. K. Schmidt, and M. Pasquali, Stable Luminescence from Individual Carbon Nanotubes in Acidic, Basic and Biological Environments. J.Amer. Chem. Soc., 130, p. 2626�2633 (2008)
C. L. Pint, S. T. Pheasant, M. Pasquali, K. Coulter, H. K. Schmidt, and R. H. Hauge, Synthesis of high aspect-ratio carbon nanotube �flying carpets� from nanostructured flake substrates. Nano Lett., 8, 1879-1883 (2008).
C. L. Pint, N. Nicholas, S. T. Pheasant, J. G. Duque, A. N. G. Parra-Vasquez, G. Eres, M. Pasquali,
and Robert Hauge, Temperature and gas pressure effects in vertically aligned carbon nanotube growth
from Fe-Mo catalyst. J. Phys. Chem. C, 112, 14041�14051, (2008).
X. Xie and M. Pasquali A New, Convenient Way of Imposing Open-flow Boundary Conditions in Two- and Three-dimensional Viscoelastic Flows. J. Non-Newtonian Fluid Mech., 122 2004: 159-176
D. Arora, M. Behr, M. Pasquali Blood Damage Measures for Ventricular Assist Device Modeling. Artificial Organs, 28 2004: 1002-1015
A. Montesi, M. Pasquali, and F. C. MacKintosh Collapse of a semiflexible polymer in poor solvent. Phys. Rev. E., 69 2004
S. Ramesh, L. M. Ericson, V. A. Davis, R. K. Saini, C. Kittrell, M. Pasquali, W. E. Billups, W. W. Adams, R. H. Hauge, R. E. Smalley Dissolution by Direct Protonation and Nematization of Pristine Single Walled Carbon Nanotubes in Superacids. J. Phys. Chem. B, 108 2004: 8794-8798
V. A. Davis, L. M. Ericson, A. Nicholas G. Parra-Vasquez, H. Fan, Y. Wang, V. Prieto, J. A. Longoria, S. Ramesh, R. K. Saini, C. Kittrell, W. E. Billups, W. W. Adams, R. H. Hauge, R. E. Smalley, M. Pasquali Phase Behavior and Rheology of SWNTs in Superacids. Macromolecules, 37 2004: 154-160
W. Zhou, J. Vavro, C. Guthy, K. I. Winey, J. E. Fischer, L. M. Ericson, S. Ramesh, R. Saini, V. A. Davis, C. Kittrell, M. Pasquali, R. H. Hauge, R. E. Smalley Single wall carbon nanotube fibers extruded from strong acid suspensions: preferred orientation and electrical resistivity. J. Appl. Phys., 95 2004: 649-655
M. Pasquali and L. E. Scriven Theoretical modeling of microstructured liquids: a simple thermodynamic approach. J. Non-Newtonian Fluid Mech., 120 2004: 101-135
R. Duggal and M. Pasquali Visualization of Individual DNA Molecules in a Small-scale Coating Flow. J. Rheol., 48 2004: 745-764
A. Montesi, A. A. Pena, and M. Pasquali Vorticity Alignment and Negative Normal Stresses in Sheared Attractive Emulsions. Phys. Rev. Lett., 92 2004