314
R. G. Weiss
Fig. 7.10 Progression of
aggregation modes for
L-dodecanoylserine into
tubules grown from toluene
and water. Reprinted with
permission from Langmuir
2001, 17, 873. Copyright
(2001) American Chemical
Society
eventual tubules (mp 60–62 °C). Also, the ribbons are not twisted if the dodecanoylserine is racemic. Another detailed example uses cryo-TEM to follow the
sequential transformation of aqueous dispersions of N-α-lauryl-lysyl-aminolauryllysyl-amide (LLALA), a molecule comprised of two dodecyl chains and two charged
lysine groups, into 1D objects—from thin fibers/ribbons to twisted ribbons to coiled
ribbons to closed nanotubes (Fig. 7.11) [84]. The observations of the separate objects
are made possible by the very different rates for the transformation steps.
Fig. 7.11 Temporal
progression of LLALA to
nanotubes (B5) by
self-assembly in aqueous
media at 25 °C: B1—thin
micrometer-long fibrils;
B2—twisted ribbons of
various widths;
B4—alternating arrowheads
highlight a cylindrical
curvature. Bars = 100 nm.
Reprinted with permission
from J Am Chem Soc 2011,
133, 2511. Copyright (2011)
American Chemical Society
R. G. Weiss
Fig. 7.10 Progression of
aggregation modes for
L-dodecanoylserine into
tubules grown from toluene
and water. Reprinted with
permission from Langmuir
2001, 17, 873. Copyright
(2001) American Chemical
Society
eventual tubules (mp 60–62 °C). Also, the ribbons are not twisted if the dodecanoylserine is racemic. Another detailed example uses cryo-TEM to follow the
sequential transformation of aqueous dispersions of N-α-lauryl-lysyl-aminolauryllysyl-amide (LLALA), a molecule comprised of two dodecyl chains and two charged
lysine groups, into 1D objects—from thin fibers/ribbons to twisted ribbons to coiled
ribbons to closed nanotubes (Fig. 7.11) [84]. The observations of the separate objects
are made possible by the very different rates for the transformation steps.
Fig. 7.11 Temporal
progression of LLALA to
nanotubes (B5) by
self-assembly in aqueous
media at 25 °C: B1—thin
micrometer-long fibrils;
B2—twisted ribbons of
various widths;
B4—alternating arrowheads
highlight a cylindrical
curvature. Bars = 100 nm.
Reprinted with permission
from J Am Chem Soc 2011,
133, 2511. Copyright (2011)
American Chemical Society