Solvated dendritic polymer structure

/images/dendrite.jpg — Molecular structures of a dendrion diblock copolymer system at two different levels of water content.

/images/rotaxane.jpg — Conformational changes in a Langmuir monolayer of amphiphilic bistable [2]rotaxane molecules.

/images/film.jpg — Newton black film structure at varying surface concentrations (top) and film thicknesses (bottom).

Work by Seung Soon Jang in Bill Goddard’s group at Caltech.

The first picture and paper are for a model of a dendrion diblock copolymer consisting of a dendritic polymer with a hydrophobic backbone. Such materials have interesting nanoscale structural and phase behavior.

The second picture and paper are for simulations of amphiphilic bistable [2]rotaxane molecules, which have controllable switching properties as their conformation changes.

The third picture and paper are studies of the structure and surface concentrations of different surfactants in thin Newton black films.

Related publications

Nanophase-Segregation and Water Dynamics in the Dendrion Diblock Copolymer Formed from Polyaryl Ethereal Dendrimer and Linear PTFE, S. S. Jang, S.-T. Lin, T. Cagin, V. Molinero, and W. A. Goddard III, J. Phys. Chem. B 109, 10154 (2005). doi:10.1021/jp050125w
Molecular Dynamics Simulation of Amphiphilic Bistable [2]Rotaxane Langmuir Monolayers at the Air/Water Interface, S. S. Jang, Y. H. Jang, Y.-H. Kim, W. A. Goddard III, J. W. Choi, J. R. Heath, A. H. Flood, B. W. Laursen, and J. F. Stoddart, J. Am. Chem. Soc. 127, 14804 (2005). doi:10.1021/ja0531531
Structures and Properties of Newton Black Films Characterized Using Molecular Dynamics Simulations, S. S. Jang and W. A. Goddard III, J. Phys. Chem. B 110, 7992 (2006). doi:10.1021/jp056685c