The University of Texas at Arlington

Zoltan A. Schelly

Zoltan A. Schelly

Professor Emeritus

Office: 356 CPB, Email: schelly@uta.edu, Phone: 817-272-3803, FAX: 817-272-3808

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DYNAMICS OF SELF-ORGANIZED SYSTEMS CLOSE TO AND FAR FROM EQUILIBRIUM

The general theme of our work is the elucidation of fast chemical and physical rate processes occurring on the nanosecond to second timescale in self-organized systems close to or far from thermodynamic equilibrium. Close to equilibrium, we investigate the dynamic behavior of spatially organized assemblies of surfactant molecules (such as synthetic vesicles, reverse micelles, and surfactant crystallites) and, far from equilibrium, we are interested in the temporal self-organization of nonlinear chemical and physical systems (such as oscillating and chaotic reactions, and phase transitions). Due to the high speed of the elementary processes involved, we use relaxation methods for their investigation.

Transient Electro-Optics and Electroporation of Vesicles, and the Preparation of Subnanometer Size Uncapped Clusters and Larger Quantum Dots

Our recent studies have focused on the behavior of unilamellar bilayer vesicles under high-voltage electric fields. Analysis of the transient induced birefringence and light scattering signals provide useful information about the morphology, structure, electrical and mechanical properties, and dynamic behavior of the membrane (Figure 1).

 

processes-schelly gif

 Figure 1.

 


timing of poration

Figure 2.

 

Above threshold values of the applied field strength and pulse length, temporary pores open across the bilayer (electroporation, EP; Figure 2), which can be exploited for the preparation of subnanometer size uncapped clusters and larger quantum dots (QD) such as Aun (Figure 3), (AgBr)n, (CdS)n, (PbS)n, and others.

Vesicle structure

Figure 3.

REPRESENTATIVE PUBLICATIONS

N. Asgharian, Z. A. Schelly:  "Accurate Determination of the Dielectric Parameters of Spherical Shells in Suspension," Phys. Chem. Chem. Phys. 2010, 12, 7688–7694.

Hongxia Zeng, Raji Reddy Vanga, Dennis S. Marynick, Zoltan A. Schelly:  "Cluster Precursors of Uncapped CdS Quantum Dots via Electroporation of Synthetic Liposomes.  Experiments and Theory," J. Phys. Chem. B 2008, 112(46), 14422-14426.

Sixin Wu, Hongxia Zeng, Z. A. Schelly:  "Growth of Uncapped, Subnanometer Size Gold Clusters Prepared via Electroporation of Vesicles," J. Phys. Chem. B 2005, 109, 18715-18718.

Sixin Wu, Hongxia Zeng, Z. A. Schelly:  "Ultra-small, Uncapped PbS Quantum Dots Prepared via Electroporation of Vesicles," Langmuir 2005, 21, 686-691.

V. Peikov, Z. A. Schelly:  "Modeling of the Electric Field-Induced Birefringence of Unilamellar Vesicles," J. Phys. Chem. B 2004, 108, 9357-9363.

Schelly, Z. A. "Transient Electro-Optics of Organized Assemblies," Colloids Surf. A 2002, 209, 305-314.

H. Zhang, Z. A. Schelly, D. S. Marynick: "Theoretical Study of the Molecular and Electronic Structures of Neutral Silver Bromide Clusters (AgBr)n, n = 1 - 9," J. Phys. Chem. A 2000, 104, 6287 -6294.

Correa, N. M.; Zhang, H.; Schelly, Z. A. "Preparation of AgBr Quantum Dots via Electroporation of Vesicles, J. Am. Chem. Soc. 2000, 122,   6432-6434.

Asgharian, N.; Schelly, Z. A. "Electric Field-Induced Transient Birefringence and Light Scattering of Synthetic Liposomes," Biochim. Biophys. Acta - Biomembranes 1999, 1418, 295-306.

Derecskei, B.; Derecskei-Kovacs, A.; Schelly, Z. A. "Atomic Level Molecular Modeling of AOT Reverse Micelles. 1. The AOT Molecule in Water and Carbon Tetrachloride," Langmuir 1999, 15, 1981-1992.

Schelly, Z. A. "Characterization of Microemulsions by Electrical Birefringence," Chapter 14 in Handbook of Microemulsion Science and Technology, P. Kumar and K. L. Mittal, Eds., Dekker, New York, 1999, pp 437-456.

Correa, N. M.; Schelly, Z. A. "Electroporation of Unilamellar Vesicles Studied by Using a Pore-Mediated Electron-Transfer Reaction," Langmuir 1998, 14, 5802-5805.

Correa, N. M.; Schelly, Z. A. "Dynamics of Electroporation of Synthetic Liposomes Studied Using a Pore-Mediated Reaction, Ag+ + Br- ® AgBr," J. Phys. Chem. B 1998, 102, 9319-9322.

Schelly, Z. A. "Dynamics in Water-in-Oil Microemulsions," Curr. Opin. Colloid Interface Sci. 1997, 2, 37-41.

Feng, K.-I; Schelly, Z. A. "Electric Birefringence Dynamics of Crystallites and Reverse Micelles of Sodium Bis(2-ethylhexyl) Phosphate in Benzene," J. Phys. Chem. 1995, 99, 17212-17218.

Feng, K.-I; Schelly, Z. A. "Equilibrium Properties of Crystallites and Reverse Micelles of Sodium Bis(2-ethylhexyl) Phosphate in Benzene," J. Phys. Chem. 1995, 99, 17207-17211.

Chen, H. M.; Schelly, Z. A. "Laser-Induced Transient Electric Birefringence and Light Scattering in Aerosol-OT/CCl4 Reverse Micelle," Langmuir 1995, 11, 758-763.

Tekle, E.; Schelly, Z. A. "Modeling the Electric Birefringence Relaxations of AOT/i-Octane/H2O Water-in-Oil Microemulsions," J. Phys. Chem. 1994, 98, 7657-7664.

Zhu, D.-M; Wu, X.; Schelly, Z. A. "Investigation of the Micropolarities in Reverse Micelles of Triton X-100 in Mixed Solvents of Benzene and n-Hexane," J. Phys. Chem. 1992, 96, 7121-7126.

Wu, X.; Schelly, Z. A. "The Effects of Surface Tension and Temperature on the Nonlinear Dynamics of the Dripping Faucet," Physica D. 1989, 40, 433-443.

Tekle, E.; Ueda, M.; Schelly, Z. A. "Dynamics of Electric Field Induced Transient Phase Separation in Water-in-Oil Microemulsions," J. Phys. Chem. 1989, 93, 5966-5969.

Ueda, M.; Schelly, Z. A. "Controlled Partial Pressure-Vapor Pressure Osmometry (CPP-VPO). A New Method for the Characterization of Reverse Micelles and W/O-Microemulsions," J. Colliod Interface Sci. 1988, 124, 673-676.

Szamosi, J.; Schelly, Z. A. "Determination of the Parameters of Multiexponential Decay Curves by Using Z-Transforms and the Method of Spike Recovery," J. Phys. Chem. 1984, 88, 3197-3199.

Szamosi, J.; Schelly, Z. A. "Treatment of Multiexponential Decay Data by the Method of Zero Determinants," J. Comput. Chem. 1984, 5, 182-185.

Noszticzius, Z.; Farkas, H.; Schelly, Z. A. "Explodator: A New Skeleton Mechanism for the Halate Driven Chemical Oscillators," J. Chem. Phys. 1984, 80, 6062-6070.

Astumian, R. D.; Schelly, Z. A. "Geometric Effects of Reduction and Dimensionality in Interfacial Reactions," J. Am. Chem. Soc. 1984, 106, 304-308.

B.Sc.  Vienna University of Technology, Austria (1962)

D.Sc.  Vienna University of Technology, Austria (1967)

Postdoctoral Fellow:
Laboratory for Surface Studies,
University of Wisconsin-Milwaukee (1968);
University of Utah (1969-1970)

After the defeat of the Hungarian revolution by the Soviet army in 1956, his mother had Zoltan
smuggled out from his native Budapest to Austria. Subsequent to spending 15 months in refugee
camps in Vienna, he finished high-school in Innsbruck and started his studies on a United
Nations scholarship at the Vienna University of Technology in 1958. He received his doctoral
degree in physical chemistry, for elucidation of the mechanism of diazotization in solvent
mixtures, with Prof. H. Schmid in 1967, and accepted a research position at the Austrian
Nitrogen Works (now Chemie Linz, AG) in Linz, Austria.
Dr. Schelly immigrated to the United States on the newly established scientist quota in 1968 and
entered a postdoctoral position, working with Prof. W. W. Brandt on mass-spectrometric studies
of the diffusion of noble gases in primitive glasses, in the Laboratory of Surface Studies at the
University of Wisconsin-Milwaukee. In 1969, he joined Prof. E. M. Eyring's group at the
University of Utah to study fast reactions by relaxation methods. He accepted an Assistant
Professor position at the University of Georgia in 1970, and was an Alexander von Humboldt
Fellow with Prof. L De Maeyer and Nobel Laureate M. Eigen in the Max-Planck Institute for
Biophysical Chemistry, Göttingen, Germany, in 1974, working on the development of the laser
temperature-jump method.
Dr. Schelly joined the faculty of the University of Texas at Arlington as an Associate Professor
in 1977. Following promotion to Professor (1982), and serving as Acting Chairman (1990-91),
he has been the Director of the Center for Colloidal and Interfacial Dynamics (since 1982) of the
Department of Chemistry and Biochemistry. His experimental and theoretical research activities
have focused on the dynamics of self-organized systems close to, and far from, thermodynamic
equilibrium.
He was a Visiting Professor at the National Defense Academy, Yokosuka, Japan (1991), and the
Technical University of Budapest, Hungary (1999).
His research accomplishments were noted by the M. G. Michael Award for Research, University
of Georgia (1975), Award for Distinguished Research, The University of Texas at Arlington
(1982), the 1986 Wilfred T. Doherty Award of the American Chemical Society, Dallas-Ft. Worth
Section, election to Vice-Chair (2003-2009) and Chair (2010-2012), International Advisory
Board of the Colloidal and Molecular Electro-Optics (ELOPTO) Conference Series, and the
international Kerr Medal (2012) in electro-optics.
He has been on the Editorial Advisory Boards of Advances in Molecular Relaxation and
Interaction Processes (1980-1983); Journal of Molecular Liquids (1983-present, Guest Editor
1995-96); Acta Chimica Hungarica (1992-2001); and Journal of Surface Science and Technology
(1996-99).
Dr. Schelly has over 110 publications, presented 93 invited lectures and seminars, and gave 80
papers at national and international conferences and symposia.

International award: 2012 Kerr Medal ("for transient electro-optics of soft matter")

Elected:  Chair, International Advisory Board of the ELOPTO Conference Series (Colloidal and Molecular Electro-Optics) (2010)

Chair/Organizer:   Symposium on Colloidal and Molecular Electro-Optics (ELOPTO-2003), Division of Colloid & Surface Chemistry, 225th ACS National Meeting, New Orleans, LA, March 23-27, 2003

Alexander von Humboldt Fellow, Max-Planck-Institute for Biophysical Chemistry, Göttingen, Germany (1974)

University Distinguished Record of Research Award (1982)

Wilfred T. Doherty Award of the American Chemical Society, Dallas-Ft. Worth Section (1986)

Editorial boards:  Advances in Molecular Relaxation and Interaction Processes (1980-83), Journal of Molecular Liquids (1983-present), ACH-Models in Chemistry (1992-2001), Journal of Surface Science and Technology (1996-99)

Department of Chemistry and Biochemistry

The University of Texas at Arlington · Arlington, Texas 76019-0065 USA

Phone: 817-272-3171 | Fax: 817-272-3808

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