Assembling of amphiphilic highly branched molecules in supramolecular nanofibers.
We found that the amplification of weak multiple interactions between numerous peripheral branches of irregular, flexible, polydisperse, and highly branched molecules can facilitate their self-assembly into nanofibrillar micellar structures at solid surfaces and the formation of perfect long microfibers in the course of crystallization from solution. The core-shell architecture of the amphiphilic dendritic molecules provides exceptional stability of one-dimensional nanofibrillar structures. The critical condition for the formation of the nanofibrillar structures is the presence of both alkyl tails in the outer shell and amine groups in the core/inner shell. The multiple intermolecular hydrogen bonding and polar interactions between flexible cores stabilize these nanofibers and make them robust albeit flexible. This example demonstrates that one-dimensional supramolecular assembling at different spatial scales (both nanofibers and microfibers) can be achieved without a tedious, multistep synthesis of shape-persistent molecules.
Materials Science and Engineering Department, Iowa State University, Ames, Iowa 50011, USA.
Maryna
M
Ornatska
Sergiy
S
Peleshanko
Kirsten L
KL
Genson
Beth
B
Rybak
Kathy N
KN
Bergman
Vladimir V
VV
Tsukruk