4 research outputs found
Body Temperature Controlled Optical and Thermal Information Storage Light Scattering Display with Fluorescence Effect and High Mechanical Strength
A kind of body temperature
controlled optical and thermal information
storage light scattering display based on super strong liquid crystalline
physical gel with special “loofah-like gel network”
was successfully prepared. Such liquid crystal (LC) gel was obtained
by mixing a dendritic gelator (POSS-G1-BOC), an azobenzene compound
(2Azo2), and a phosphor tethered liquid crystalline host (5CB), which
could show its best contrast ratio at around human body temperature
under UV light because of the phosphor’s fluorescence effect.
The gel also has quite strong mechanical strength, which could be
used in wearable device field especially under sunlight, even under
the forcing conditions as harsh as being centrifuged for 10 min at
the speed of 2000 r/min. The whole production process of such a display
is quite simple and could lead to displays at any size through noncontact
writing. We believe it will have wide applications in the future
Body Temperature Controlled Optical and Thermal Information Storage Light Scattering Display with Fluorescence Effect and High Mechanical Strength
A kind of body temperature
controlled optical and thermal information
storage light scattering display based on super strong liquid crystalline
physical gel with special “loofah-like gel network”
was successfully prepared. Such liquid crystal (LC) gel was obtained
by mixing a dendritic gelator (POSS-G1-BOC), an azobenzene compound
(2Azo2), and a phosphor tethered liquid crystalline host (5CB), which
could show its best contrast ratio at around human body temperature
under UV light because of the phosphor’s fluorescence effect.
The gel also has quite strong mechanical strength, which could be
used in wearable device field especially under sunlight, even under
the forcing conditions as harsh as being centrifuged for 10 min at
the speed of 2000 r/min. The whole production process of such a display
is quite simple and could lead to displays at any size through noncontact
writing. We believe it will have wide applications in the future
Self-Assembly of a Strong Polyhedral Oligomeric Silsesquioxane Core-Based Aspartate Derivative Dendrimer Supramolecular Gelator in Different Polarity Solvents
Aromatic
groups are introduced into the end peripherals of polyhedral
oligomeric silsesquioxane (POSS) core-based organic/inorganic hybrid
supramolecules to get a novel dendrimer gelator POSS-Z-AspÂ(OBzl) (POSS-ASP),
which have eight aspartate derivative arms to make full use of strong
π–π stacking forces to get strong supramolecular
gels in addition to multiple hydrogen bindings and van der Waals interactions.
POSS-ASP can self-assemble into three-dimensional nanoscale gel networks
to provide hybrid physical gels especially with strong mechanical
properties and fast-recovery behaviors. Two totally different morphologies
of the connected spherical particle structures and banded ultralong
fibers are observed owing to the polarity of solvents confirmed by
the scanning electron microscopy, polarized optical microscopy, and
transmission electron microscopy techniques, expecting the existing
various self-assembly models and illustrating the peripherals of the
dendrimer and the polarity of solvents having huge influences in the
supramolecular self-assembly mechanism. What is more, the thermal
stability, rheological properties, and network architecture information
have also been investigated via tube-inversion, rotational rheometer,
and powder X-ray diffraction methods, the results of which confirm
the two different gel formation mechanisms that make POSS-ASP to exhibit
two totally different thermal and mechanical properties. Such a study
reports a new gelation system in organic or organic/aqueous mixed
solvents, which can be helpful for investigating the relationship
of dendritic supramolecular gelation and different polarity solvents
during the supramolecular self-assembly process of gelators
Stronger Intermolecular Forces or Closer Molecular Spacing? Key Impact Factor Research of Gelator Self-Assembly Mechanism
The
benzene ring of low-molecular-weight gelators provides strong
intermolecular forces but increases molecular spacing during self-assembly.
To explore both of the above influences on the gel properties, we
synthesize two gelators (Glu-CBZ and Glu-DPA) consisting of the same
terminal long side chain but different aliphatic functional groups.
The aliphatic functional groups are carbobenzoxy group and diphenyl
phosphate group. The self-assembly driving forces, self-organization
patterns, network morphologies, rheological properties, and the influences
of solvents are researched through <sup>1</sup>H NMR spectra, Fourier
transform infrared spectra, field-emission scanning electron microscopy
images, rheological characterizations curves, tube-inversion experiment,
and calculation of van’t Hoff plots. The results show that
the carbobenzoxy group of Glu-CBZ makes molecules pack more tightly
such that it improves the gel properties during static equilibrium.
Whereas the diphenyl phosphate group of Glu-DPA provides stronger
intermolecular forces, performing outstandingly during dynamic equilibrium.
It is advantageous to further investigate the competitive relationship
in gel system between the increased number of functional groups and
the consequent steric effect