Tuesday, August 5, 2008, 10:00 am — CFN - Bldg. 735 - Conf. Rm. B
Center for Functional Nanomaterials Seminar
Tuesday, August 5, 2008
CFN First Floor Conference Room B
10:00 am
DNA Beyond Biology
Dmytro Nykypanchuk
CFN, Brookhaven National Laboratory
As a monodisperse, well defined, and robust macromolecule, DNA can be used as a model system in polymer physics studies. We utilized single molecule detection to investigate the macromolecular dynamics and thermodynamics in tailorable, ordered, and geometrically well-defined porous spaces produced by colloidal templating. The direct visualization of DNA diffusion demonstrates that entropic barrier mechanism dominates dynamics over a wide range of confinement conditions. The observed unusual effects of macromolecular size and topology as well as pore sizes on macromolecular dynamics are qualitatively explained by the diffusion mechanism.
In the second part of the talk I will discuss how the specific and non-specific interactions between DNA molecules can be harnessed for self assembly of micro- and nano-sized particles. Using in situ optical and scattering methods, we have studied an assembly kinetics, structure development, and phase formation of DNA-capped particles on surfaces and in bulk for various assembly schemes. The DNA design and thermodynamic pathway leading to long range crystalline ordering of nanoparticles has been uncovered.
Hosted by: Oleg Gang
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