Materials Literature
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Novel two-phase materials based on nematic liquid crystals (LC E7) filled with poly(propylene imine) dendrimers of 2–3 nm diameter were investigated for application in light-scattering, electro-optical switches. Polarizing optical microscopy, differential scanning calorimetry and rheological experiments all indicate t…
The electronic structure of magnetic impurities in ZnS is determined by near edge x-ray absorption for the $3d$ transition metals Ti, Mn, Fe, Co, Ni embedded in single crystal ZnS. By detecting emitted fluorescence photons instead of electrons it is possible to suppress the background from the host and to eliminate ch…
Several chiral azobenzene compounds having different chiral substituents were synthesized. A cholesteric phase was induced by mixing each chiral azobenzene compound with a host non-chiral nematic liquid crystal (E44). The helical twisting power (HTP) as well as the change in HTP by trans-cis photoisomerization of the…
A hydrotalcite clay/dendrimer nanocomposite prepared by the ionic exchange process was adsorbed from suspension of the nanocomposite on a Langmuir monolayer of arachidic acid at the air/water interface, followed by compressing and transferring onto an arachidic acid monolayer Langmuir-Blodgett (LB) film on mica. For c…
We have investigated the orthoconic antiferroelectric liquid crystal mixture W107 by means of optical, X-ray and calorimetry measurements in order to assess the origin of the unusally high tilt angle between the optic axis and the smectic layer normal in this material. The optical birefringence increases strongly belo…
Abstract Summary: A new method to synthesize polyimide (PI)/silica nanohybrids has been presented. It uses silicic acid oligomer as the silica precursor, which was obtained by extracting with tetrahydrofuran (THF) from PH‐adjusted water glass. The films of PI/silica nanohybrids remained transparent even at high silica…
Measurements of water adsorption equilibrium and kinetics in Takeda carbon molecular sieve (CMS) were undertaken in an effort to characterize fundamental mechanisms of adsorption and transport. Adsorption equilibrium revealed a type III isotherm that was characterized by cooperative multimolecular sorption theory. Wat…
The self-assembled growth of ordered ZnO nanowires on GaN/Si layers has been observed at the low temperature of 500 °C through Zn evaporation and oxidation. The nanowires have a nearly uniform diameter of 40 nm and length of nm. No metal catalyst was used. Interestingly, the nanowires grow on a wetting film of an inte…
The synthesis and characterization of the mesomorphic and dielectric properties of a series of new imine-based liquid crystalline compounds that exhibit tilted SmC* phases is reported. The presence of an imino linkage within the mesogenic nucleus of these compounds is significant due to the ability of salicylaldimines…
Very thin films of oriented and densely packed single-walled carbon nanotubes (SWNTs) can be self-assembled on substrates from surfactant sodium dodecyl sulfate (SDS-) coated SWNT suspensions at ambient conditions. The evaporation of water causes a concentration of the SDS-coated nanotubes above critical micelle conce…
Single-molecule magnets of the type ${\mathrm{V}}_{15}({\mathrm{K}}_{6}[{\mathrm{V}}_{15}{\mathrm{As}}_{6}{\mathrm{O}}_{42}({\mathrm{H}}_{2}\mathrm{O})]∙8{\mathrm{H}}_{2}\mathrm{O})$ have attracted a great deal of attention recently, being promising systems for studying low-temperature spin-relaxation and quantum-spin…
The degradation profiles of six sodium iron phosphate glass formulations have been investigated using simple dissolution trials in deionized water. The glasses were produced from the appropriate phosphate salts by melting at 1200 degrees C in 5% Au/95% Pt crucibles. Dissolution rates varied from 0.2 gcm(-2)h(-1) for t…
Abstract Summary: The success of the use of layered silicates in polymer nanocomposites, to improve physical and chemical properties is strictly related to a deeper knowledge of the mechanistic aspects on which the final features are grounded. This work shows the temperature induced structural rearrangements of nanoco…
Rod-shaped and wire-shaped SnO 2 nanowhiskers were synthesized by thermal evaporating of tin powders at 900 °C. Three Raman peaks (474, 632, 774 cm −1 ) showed the typical feature of the rutile phase of as-synthesized SnO 2 nanowhiskers, which was consistent with the result of x-ray diffraction. A relatively low turn-…
Reaction of monosubstituted Keggin polyoxometalates (POMs) and [Cu(ac)(pmdien)]+ generated in situ led to the formation of the hybrid metal organic-inorganic compound K5[Cu(ac)(pmdien)][SiW11CuO39].12H2O; its crystal structure and magnetic properties have also been determined. The packing of this compound can be viewe…
Dendrimers with molecular weights ranging from ca. 2700 to 11 000 and from 16 to 64 homoallyl ether end groups were cross-linked using the Grubbs ring-closing metathesis reaction. A combination of SEC, MALDI-TOF-MS, and AFM were used to characterize the cross-linked nanoparticles. The data suggest a significant decrea…
The structural properties of carbon nanotube (CNT) polymer composite interfaces have been studied through molecular dynamics simulations. Polymer (polyethylene) molecules are found to form discrete adsorption layers as a function of radial distance from the axis of the nanotube. The molecules within the adsorption lay…
Azobenzene-appended melamine M2 and barbiturate B2, both possessing bulky tridodecyloxyphenyl (TDP) wedge(s), were designed and synthesized to establish a photoresponsive hydrogen-bonded supramolecular assembly. The geometrical isomer EE-M2 bearing two E-azobenzene moieties easily complexed with B2, affording a remark…
Electrically conductive polypyrrole (PPY) was surface functionalized with hyaluronic acid (HA) and sulfated hyaluronic acid (SHA) to improve its surface biocompatibility. The immobilization of HA on the PPY film was facilitated by the use of a cross-linker having the appropriate functional groups. The biological activ…
Polyphosphazene polyacids show potential as immunostimulating compounds and materials for microencapsulation. Their synthesis requires multistep chemical transition from a hydrolytically unstable macromolecular precursor, poly(dichlorophosphazene), to a water-soluble polyelectrolyte. Insufficient synthetic control in…