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Oklahoma State University

Shohreh Hemmati

Assistant ProfessorDr. Shohreh Hemmati

shohreh.hemmati@okstate.edu

 

ACADEMIC BACKGROUND

Postdoctoral Research Associate, School of Chemical Engineering, Purdue University, 2016-2018

Ph.D., Chemical Engineering, University of New Hampshire, 2016

M.S., Chemical Engineering, Shariff University of Technology, 2009

B.S., Chemical Engineering, Arak University, 2006

 

MAJOR AREAS OF RESEARCH

Green 1D Silver and Palladium Nanostructure Synthesis

VLPs Expression and their Application as Biotemplate

Green Multifunctional Metal Nanostructure Synthesis

Solar Cells and Photovoltaics

 

RECENT RESEARCH ACTIVITIES

Green 1D Silver and Palladium Nanostructure Synthesis

Nowadays, green noble nanoparticle synthesis process utilizing natural precursors is of great interest because of its advantages as a cost effective, facile, less harmful, and sustainable technology. However, these new techniques should be optimized not only in terms of scale-up capability, but also in aspects of product quality and performance.

Our main focus is utilizing different millifluidic methods for synthesis of 1D Silver (Ag) and Palladium (Pd) nanostructures. Our goal is reducing their final cost by an order of magnitude through the application of less expensive water based reducing agents at lower reaction temperature in a green and continuous manner.

 

VLPs Expression and their Application as Biotemplate

Bottom-up nanomaterial syntheses with the ability to control material characteristics from the molecular level to the bulk level have numerous advantages over traditional techniques, and templating is one of the most essential methods to control nanomaterial synthesis.

Our motivation in this area is design and test engineered and natural Tobacco mosaic virus (TMV) coat protein (CP) and Barley stripe mosaic virus (BSMV) CP from Escherichia coli (E-coli) in collaboration with synthetic biological laboratories. Then we will be able to assemble virus-like particles (VLPs) as tunable biotemplates for silver and palladium nanostructure synthesis that are safer and less resource-intensive than conventional synthesis methods.

 

Green Multifunctional Metal Nanostructure Synthesis

Our lab is able to provide metal nanostructures with specific morphology for use by other labs and groups for further practical applications. As commercially available 1D metal nanostructures are expensive, the findings from our research will provide a tool to control the morphology of 1D metal nanostructures in an inexpensive way. The result will increase efficiency and lower cost of various 1D metal nanostructure-based devices.

 

Solar Cells and Photovoltaics

Growing energy demand, increasing fossil fuel costs, and environmental pollution concerns illustrate the necessity of efficient and clean power sources. Harvesting solar energy as an abundant source requires a cost-efficient method, and photovoltaic energy conversion is a promising technology. Solar cells and solar voltaic panels are rapidly becoming cheaper and more efficient, and there is a growing global market for units of all sizes.

Our work in this area focuses on application of the green synthesized 1D metal nanostructures in our lab to formulate conductive inks adaptable for each specific printing process. Then we will be able to create conductive patterns specifically for solar cells and photovoltaic applications using film deposition processes such as screen-printing.

 

RECENT PUBLICATIONS

S. Hemmati, D. P. Barkey, L. Eggleston, B. Zukas, N. Gupta, M. T. Harris, "Silver Nanowire Synthesis in a Continuous Millifluidic Reactor", ECS Journal of Solid State Science and Technology, 6 (4), 144-149, 2017.

 

S. Hemmati, D. P. Barkey, "Parametric Study, Sensitivity Analysis, and Optimization of Polyol Synthesis of Silver Nanowires", ECS Journal of Solid State Science and Technology, 6 (4), 132-137, 2017.

 

S. Hemmati, D. P. Barkey, N. Gupta, "Rheological Behavior of Silver-Nanowire Conductive Inks during Screen Printing", J Nanopart. Res. 18:249, 249-259, 2016.

 

S. Hemmati, D. P. Barkey, N. Gupta, R. Banfield, "Synthesis and Characterization of Silver Nanowire Suspensions for Printable Conductive Media", ECS Journal of Solid State Science and Technology, 4 (4), 3075-3079, 2015.

 

S. Hemmati, M. Vosoughi, GR. Pazuki, Y. Saboohi, N. Hashemi, "Supercritical Gasification of Biomass: Thermodynamic Analysis with Gibbs Free Energy Minimization", Energy Sources, Part A, 34, 163-176, 2012.

 

N. Hashemi, S. Hemmati. M. Vossoughi. Y. Sabohi. GR. Pazuki, "Application of a New Gibbs Energy Equation to Model a Distillation Tower for Production of Pure Ethanol", Chem. Eng. Technol., 34 (10), 1715-1722, 2011.