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Zvonimir Dogic

zdogic@brandeis.edu
781-736-2800
Office: Abelson-Bass-Yalem 216

Assistant Professor of Physics
Ph.D., Brandeis University, 2001

My research covers several areas in complex fluids and biological physics. The objective of my research is to understand and control the self-assembly of matter on a colloidal length scale. The basic building blocks used are colloids of chemical or biological origin with well controlled spherical or rod-like shape and polymers with varying persistence length. The interactions between these components are well understood and can be modified in systematic ways. Despite the simplicity of these building blocks, they assemble into a variety of novel structures with unexpected complexity, e.g. 2D smectic phases, colloidal membranes, twisted chiral ribbons, and lamellar and columnar phases. These processes of self-assembly are under thermodynamic control and we use statistical mechanics to understand the final equilibrium structures. In the future we intend to study the assembly, phase transitions and dynamics of colloidal systems under non-equilibrium conditions.

Currently active topics include rods in shear flow, polymers in nematics, isotropic-smectic phase transition, chiral ribbons, 2D smectic phases, lamellar melting, and studies of the fd virus.


Sample of Recent Publications:

  • Z. Dogic and S. Fraden, “Ordered phases of filamentous viruses”, (to be published in Current opinion in Colloid and Interface Science)


  • E. Barry, Z. Hensel, M. Shribak, R. Oldenbourg and Z. Dogic, “Entropy driven formation of a chiral liquid crystalline phase of helical filaments”, (to be published in Physical Review Letters)


  • M. P. Lettinga, Z. Dogic, H. Wang and J. Vermant, Flow behavior of colloidal rod-like viruses in the namatic phase”, Langmuir, 21, 8048 (2005).


  • M. P. Lettinga, E. Barry and Z. Dogic, “Self-diffusion of rod-like viruses in the nematic phase”, Europhysics Letters, 71, 692, (2005).


  • Z. Dogic and S. Fraden, “Phase behavior of rod-like viruses and virus-sphere mixtures”, to appear in Soft Matter, volume 2, Editors Gerhard Gompper and Michael Schick.


  • A. M. Alsayed, Z. Dogic, and A. G. Yodh, “Melting of lamellar phases in temperature sensitive colloid-polymer mixture”, Phys. Rev. Lett., 93, 057801 (2004).


  • Z. Dogic, K. R. Purdy, E. Grelet, M. Adams and S. Fraden, “Isotropic-nematic phase transition in suspension of filamentous virus and dextran”, Phys. Rev. E., 69, 051702 (2004).


  • Z. Dogic, J. Zhang, A. W. C. Lau, P. Dalhaimer, H. Aranda-Espinoza, D. Disher, P. Janmey, R. D. Kamien, T. C Lubensky and A. G. Yodh, “Elongation and fluctuations of semi-flexibile polymers in a nematic solvent”, Phys. Rev. Lett., 92, 125503 (2004).


  • M. F. Islam, A. M. Alsayed, Z. Dogic, J. Zhang, T. C. Lubensky, and A. G. Yodh, “Nematic Nanotube Gels”, Phys. Rev. Lett., 92, 088303, (2004).


  • Z. Dogic, “Surface freezing and a two-step pathway of the isotropic-smectic phase transitions in colloidal rods”, Phys. Rev. Lett., 91, 165701, (2003).


  • K. R. Purdy, Z. Dogic, S. Fraden, A. Rühm, L. Lurio, S. G. J. Mochrie, “Measuring the nematic order parameter of colloidal fd virus by x-ray diffraction”, Phys. Rev. E., 67, 031708 (2003).


  • J. K. G. Dhont, M. P. Letting, Z. Dogic, T. A. J. Lenstra, H. Wang, S. Rathgeber, P. Carletto, L. Willner, H. Frielinghaus and P. Lindner, “ Shear-banding and Microstructure of Colloids in Shear Flow”, Faraday Discussions, 123, 157 (2003).


  • T. A. J. Lenstra, Z. Dogic and J. K. G. Dhont, “Shear induced displacement of the isotropic-nematic spinodals”, J. Chem. Phys., 114, 10151 (2001).


  • Dogic, Z. and S. Fraden, “ Development of model colloidal liquid crystals and the kinetics of the isotropic - smectic transition” , Phil. Tran. R. Soc. Lond. A. , 359, 997 (2001).


  • Dogic, Z. and S. Fraden, “Cholesteric phase in virus suspensions”, Langmuir 16, 7820 (2000).


  • Dogic, Z., A.P. Philipse, S. Fraden, and J.K.G. Dhont, “Concentration dependent sedimentation of colloidal rods”, J. Chem. Phys. 113, 8368 (2000).


  • Dogic, Z., D. Frenkel, and S. Fraden, “ Enhanced stability of layered phases in parallel hard-spherocylinders due to the addition of hard spheres” , Phys. Rev. E 62, 3925 (2000).


  • Adams, M., Z. Dogic, S.L. Keller, and S. Fraden, “Entropically driven microphase transitions in mixtures of colloidal rods and spheres”, Nature 393, 349 (1998).


  • Dogic, Z. and S. Fraden, “Smectic phase in a colloidal suspension of semiflexible virus particles”, Phys. Rev. Lett., 78, 2417 (1997).