4 research outputs found
Nonresonant Vibrational Energy Transfer on Metal Nanoparticle/Liquid Interface
Knowledge of vibrational energy transfer
on a metal nanoparticle/liquid
interface is essential for understanding the energy conversion process
involved in many heterogeneous nanocatalyses. In this study, we investigate
mode-specific vibrational energy transfer between CO molecules on
different adsorbate sites on a 1 nm platinum metal nanoparticle/liquid
interface by using ultrafast two-dimensional IR spectroscopy. The
vibrational energy transport is found to be induced by vibration/vibration
coupling with very little surface electron/vibration mediation. The
energy transfer rate is determined to be about 1/140 ps<sup>–1</sup> from the atop site CO to the bridge site CO, and the specific rate
is around 1/400 ps<sup>–1</sup> between the two nearest adsorbates.
The energy transfer between different adsorbate sites can be described
by the dephasing mechanism reasonably well. The mechanical coupling
may contribute to the transfer, but analyses suggest that the role
of dipole/dipole interaction is a more important factor for the energy
transfer
Electromechanically Responsive Liquid Crystal Elastomer Nanocomposites for Active Cell Culture
Liquid crystal elastomers
(LCEs) are unique among shape-responsive
materials in that they exhibit large and reversible shape changes
and can respond to a variety of stimuli. However, only a handful of
studies have explored LCEs for biomedical applications. Here, we demonstrate
that LCE nanocomposites (LCE-NCs) exhibit a fast and reversible electromechanical
response and can be employed as dynamic substrates for cell culture.
A two-step method for preparing conductive LCE-NCs is described, which
produces materials that exhibit rapid (response times as fast at 0.6
s), large-amplitude (contraction by up to 30%), and fully reversible
shape changes (stable to over 5000 cycles) under externally applied
voltages (5–40 V). The electromechanical response of the LCE-NCs
is tunable through variation of the electrical potential and LCE-NC
composition. We utilize conductive LCE-NCs as responsive substrates
to culture neonatal rat ventricular myocytes (NRVM) and find that
NRVM remain viable on both stimulated and static LCE-NC substrates.
These materials provide a reliable and simple route to materials that
exhibit a fast, reversible, and large-amplitude electromechanical
response
Electromechanically Responsive Liquid Crystal Elastomer Nanocomposites for Active Cell Culture
Liquid crystal elastomers
(LCEs) are unique among shape-responsive
materials in that they exhibit large and reversible shape changes
and can respond to a variety of stimuli. However, only a handful of
studies have explored LCEs for biomedical applications. Here, we demonstrate
that LCE nanocomposites (LCE-NCs) exhibit a fast and reversible electromechanical
response and can be employed as dynamic substrates for cell culture.
A two-step method for preparing conductive LCE-NCs is described, which
produces materials that exhibit rapid (response times as fast at 0.6
s), large-amplitude (contraction by up to 30%), and fully reversible
shape changes (stable to over 5000 cycles) under externally applied
voltages (5–40 V). The electromechanical response of the LCE-NCs
is tunable through variation of the electrical potential and LCE-NC
composition. We utilize conductive LCE-NCs as responsive substrates
to culture neonatal rat ventricular myocytes (NRVM) and find that
NRVM remain viable on both stimulated and static LCE-NC substrates.
These materials provide a reliable and simple route to materials that
exhibit a fast, reversible, and large-amplitude electromechanical
response
Electromechanically Responsive Liquid Crystal Elastomer Nanocomposites for Active Cell Culture
Liquid crystal elastomers
(LCEs) are unique among shape-responsive
materials in that they exhibit large and reversible shape changes
and can respond to a variety of stimuli. However, only a handful of
studies have explored LCEs for biomedical applications. Here, we demonstrate
that LCE nanocomposites (LCE-NCs) exhibit a fast and reversible electromechanical
response and can be employed as dynamic substrates for cell culture.
A two-step method for preparing conductive LCE-NCs is described, which
produces materials that exhibit rapid (response times as fast at 0.6
s), large-amplitude (contraction by up to 30%), and fully reversible
shape changes (stable to over 5000 cycles) under externally applied
voltages (5–40 V). The electromechanical response of the LCE-NCs
is tunable through variation of the electrical potential and LCE-NC
composition. We utilize conductive LCE-NCs as responsive substrates
to culture neonatal rat ventricular myocytes (NRVM) and find that
NRVM remain viable on both stimulated and static LCE-NC substrates.
These materials provide a reliable and simple route to materials that
exhibit a fast, reversible, and large-amplitude electromechanical
response