1 Investigative Tools--Theory, Modeling, and Simulation Rational You ITRI-IEK-NEMS 2001/08/06 Source: IWGN (1999/09)

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Presentation transcript:

1 Investigative Tools--Theory, Modeling, and Simulation Rational You ITRI-IEK-NEMS 2001/08/06 Source: IWGN (1999/09)

2 Issues in Investigative Tools Current Scientific and Technological Advancements Goals for the Next 5-10 Years: Barriers and Solutions Scientific and Technological Infrastructure R&D Investment and Implementation Strategies Priorities and Conclusions Source: IWGN (1999/09)

3 Priorities in Investigative Tools ‧ Develop simulations that embody multi-scale and coupled multi- phenomena descriptions. Special attention should be given to larger systems of atoms and molecules and to simultaneous simulation of more than one aspect (mechanical, electronic, etc.). ‧ Advance outstanding theories, such as nucleation, charging, electron transport, mechanical cracking, chemical reactions in special environments, and multi-body processes in order to significantly improve simulations. ‧ Take advantage of outstanding opportunities for development of theories and simulation methods by studying nano-structures. This may provide ground for new theories that can be used in other fields. ‧ Maintain continuous assessment and interaction among researchers doing simulations on various aspects of nano-science and engineering. ‧ Encourage cross-disciplinary research (e.g., nano-electronics, thermodynamics, ehcmistry, mechanics, biological processes, and others) and education in order to enable future developments in nanotechnology. Source: IWGN (1999/09)

4 Scales and Scaling of Computational Complexity for Molecular Calculations on Nano-particles Source: IWGN (1999/09)

5 Temporal Scaling of Computational Complexity for Molecular Calculations on Nano-particles --- Source: IWGN (1999/09)

6 Spatial Scaling of Computational Complexity for Molecular Calculations on Nano-particles --- Source: IWGN (1999/09)

7 Nanoscale Lubrication (1) Snapshot of n-tetracosane in bulk under shear flow at a shear rate of 7 x 10 9 s -1, density of 0.82 g cm -3 and temperature of 313 K. Only the carbons are shown. Molecules are shaded in different colors to aid in distinguishing them. Snapshot of n-tetracosane under shear flow confined between two walls with tethered butane chains, with wall spacing of 3.6 nm, the same apparent shear rate, core liquid density of 0.82 g cm -3, and temperature of 313 K. End groups are shown in black. Source: IWGN (1999/09)

8 Nanoscale Lubrication (2) Snapshot of squalane under shear flow confined between two walls with tethered butane chains, with wall spacing of 3.6 nm, the same apparent shear rate, core liquid density of 0.82 g cm -3, and temperature of 323 K. Sidegroups are shown in gray. Source: IWGN (1999/09)

9 Simulations of Carbon Nanotubes --T junction Metal-semiconductor-metal T junction using (5, 5), (10, 0), and (5, 5) nanotubes. The turquoise colored balls denote the atoms forming the heptagons. Source: IWGN (1999/09), Menon and Srivastava 1997

10 Simulations of Carbon Nanotubes--Teeth Carbon nanotube-based gears with benzyne teeth Source: IWGN (1999/09)

11 Simulation of Quantum Dots--SiO2 An atomistic SiO2 quantum dot bridging between two silicon surfaces. Source: IWGN (1999/09)

12 Molecular Simulation of DNA Molecule Dynamics Brownian dynamics snapshots of DNA: Brownian dynamics snapshots of 3,000 base pairs of circular DNA focusing on the juxtaposition of two segments separated by 1,200 base pairs over 6 ms, showing the large random motions that bring sites together. Source: IWGN (1999/09), Jing Huang

13 Simulation of quantum confinement in silicon nanocrystals Ball and stick model of Si575H276. The white dots correspond to H atoms, which passivate the surface of the dot. Source: IWGN (1999/09)

14 Molecular Dynamics Simulation of Piezoelectric Polymers (1) Experimental optical gaps for silicon quantum dots. Source: IWGN (1999/09), Furukawa and Miyasoto (1988) Theoretical optical gaps versus experiment.

15 Molecular Dynamics Simulation of Piezoelectric Polymers (2) An amorphous cell at experimental density containing 5 repeat units of a piezoelectric polyimide. Planes of large spheres represent metal electrodes; they are used to simulate a poling field. Source: IWGN (1999/09)