LSM - Seminars: October 2005 Archives

Seminars Archives

September 2005 | October 2005 | November 2005

Thursday, October 06, 2005
"Charge Transport in Molecular Monolayers, Multilayers, and Thin Films." Cherie R. Kagan Manager, Molecular Assemblies and Devices IBM T.J. Watson Research Ctr. Yorktown Heights, NY 12:00 noon, Room 260, Wright-Rieman Chemistry Laboratory Abstract: Molecular materials are being aggressively pursued for a wide range of applications in low-cost, large-area, flexible macroelectronics and potentially as a post-CMOS alternative to high density, high performance nanoelectronics. For these systems to realize their potential, a fundamental understanding of the chemical and physical properties of molecular and supramolecular assemblies is required. In this talk, I will describe the synthesis, assembly, and characterization of molecular monolayers, multilayers, and thin films and the intermolecular, intramolecular, and interfacial interactions important to charge transport. Spectroscopic, microscopic, and electrochemical techniques are used to characterize molecular and supramolecular assemblies. I will show solution processable, molecular thin films form the active channels of transistors with field-effect mobilities (in micron scale devices) of ~1 cm2/V-sec and ION/IOFF>106, comparable to amorphous silicon TFTs. To probe inter- and intramolecular charge transport in molecular monolayers and multilayers, I will draw on state-of-the-art silicon processing to fabricate nanometer scale device test structures and use novel chemical routes to assemble molecular materials at the device interfaces and to bridge the junctions. Integrating molecular assemblies in device test structures provides a platform to probe the underlying physics of charge transport necessary to develop structure-function relationships in molecular materials.

Thursday, October 06, 2005

"Charge Transport in Molecular Monolayers, Multilayers, and Thin Films."
Cherie R. Kagan
Manager, Molecular Assemblies and Devices
IBM T.J. Watson Research Ctr.
Yorktown Heights, NY
12:00 noon, Room 260, Wright-Rieman Chemistry Laboratory

Abstract: Molecular materials are being aggressively pursued for a wide range of applications in low-cost, large-area, flexible macroelectronics and potentially as a post-CMOS alternative to high density, high performance nanoelectronics. For these systems to realize their potential, a fundamental understanding of the chemical and physical properties of molecular and supramolecular assemblies is required. In this talk, I will describe the synthesis, assembly, and characterization of molecular monolayers, multilayers, and thin films and the intermolecular, intramolecular, and interfacial interactions important to charge transport. Spectroscopic, microscopic, and electrochemical techniques are used to characterize molecular and supramolecular assemblies. I will show solution processable, molecular thin films form the active channels of transistors with field-effect mobilities (in micron scale devices) of ~1 cm2/V-sec and ION/IOFF>106, comparable to amorphous silicon TFTs. To probe inter- and intramolecular charge transport in molecular monolayers and multilayers, I will draw on state-of-the-art silicon processing to fabricate nanometer scale device test structures and use novel chemical routes to assemble molecular materials at the device interfaces and to bridge the junctions. Integrating molecular assemblies in device test structures provides a platform to probe the underlying physics of charge transport necessary to develop structure-function relationships in molecular materials.

Thursday, October 13, 2005
"Hydrogen bonds and dielectric properties of water." Roberto Car Porfessor of Chemistry and Princeton Institute for the Science and Technology of Materials Princeton University 12:00 noon, room 260, Wright-Rieman Chemistry Laboratory Abstract:Hydrogen bonds are at the origin of many special properties of water. In this talk I will report extensive ab-initio molecular dynamics simulations and simple model calculations that shed light on the origin of (a) the anomalously large static dielectric constant of water, and (b) the so-called hindered translational modes in the far infrared spectrum of water. We show that in both cases correlations between adjacent molecules due to H-bonds play an essential role.

Thursday, October 13, 2005

"Hydrogen bonds and dielectric properties of water."
Roberto Car
Porfessor of Chemistry and Princeton Institute for the Science and Technology of Materials
Princeton University
12:00 noon, room 260, Wright-Rieman Chemistry Laboratory

Abstract:Hydrogen bonds are at the origin of many special properties of water. In this talk I will report extensive ab-initio molecular dynamics simulations and simple model calculations that shed light on the origin of (a) the anomalously large static dielectric constant of water, and (b) the so-called hindered translational modes in the far infrared spectrum of water. We show that in both cases correlations between adjacent molecules due to H-bonds play an essential role.

Thursday, October 27, 2005
"Nanoscale Material Interfaces for Cellular and Matrix Bioengineering." Prabhas Moghe Dept. of Biomedical Engineering and Dept. of Chemical & Biochemical Engineering Rutgers University 12:00 Noon, Room 260, Wright-Rieman Chemistry Laboratory ABSTRACT: The confluence of cell/molecular biology and materials sciences is being radically shaped by the advent of nanotechnology. A growing number of complex problems bridging these fields require the understanding and application of cellular responses to biomolecular cues configured at the nanoscale. This talk will cover two threads of investigation being pursued in our laboratory at Rutgers and by our collaborators: In the first, we have discovered that epidermal and connective tissue cells can be activated upon contact with nanoscale displays of adhesive matrix ligands. Binding and cytointernalization of the ligand nanosubstrates caused increased motility in keratinocytes and increased matrix assembly by fibroblasts, two key processes involved during wound repair. In the second thrust, we and our collaborators have developed a bioinspired class of nanoscale macromolecules that can sequester a key matrix ligand, low density lipoprotein, whose dynamics within the vascular intima is the basis of atherogenesis and vascular disease. Data on these macromolecules highlight a promising use for nanotechnology to cause the selective sequestration, and cell-based clearance, of differentially oxidized lipoproteins.

Thursday, October 27, 2005

"Nanoscale Material Interfaces for Cellular and Matrix Bioengineering."
Prabhas Moghe
Dept. of Biomedical Engineering and Dept. of Chemical & Biochemical Engineering
Rutgers University
12:00 Noon, Room 260, Wright-Rieman Chemistry Laboratory

ABSTRACT: The confluence of cell/molecular biology and materials sciences is being radically shaped by the advent of nanotechnology. A growing number of complex problems bridging these fields require the understanding and application of cellular responses to biomolecular cues configured at the nanoscale. This talk will cover two threads of investigation being pursued in our laboratory at Rutgers and by our collaborators: In the first, we have discovered that epidermal and connective tissue cells can be activated upon contact with nanoscale displays of adhesive matrix ligands. Binding and cytointernalization of the ligand nanosubstrates caused increased motility in keratinocytes and increased matrix assembly by fibroblasts, two key processes involved during wound repair. In the second thrust, we and our collaborators have developed a bioinspired class of nanoscale macromolecules that can sequester a key matrix ligand, low density lipoprotein, whose dynamics within the vascular intima is the basis of atherogenesis and vascular disease. Data on these macromolecules highlight a promising use for nanotechnology to cause the selective sequestration, and cell-based clearance, of differentially oxidized lipoproteins.

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