The University of Texas at Arlingon

Zoltan A. Schelly        
Physical and Colloid Chemistry

Professor,
Graduate Advisor of the Department

(See also:  Center for Colloidal and Interfacial Dynamics)

   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)

  Course web pages

  

Phone: 817-272-3803    FAX: 817-272-3808     E-mail: schelly@uta.edu     Office: 356 CPB     Personal Page


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)

RESEARCH INTERESTS

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 (16227 bytes)     timing-schelly.gif (18712 bytes)    

      Figure 1                Figure 2                                                Figure 3

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.

 

REPRESENTATIVE PUBLICATIONS:

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.

Acknowledgment:

 Our work has been supported in part by the NSF, ACS PRF, the Welch Foundation, and the Texas Advanced Research Program.

 

Department of Chemistry and Biochemistry
The University of Texas at Arlington
Arlington, Texas 76019-0065, USA
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