Materials Literature
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Novel liquid-crystal materials based on 1-alkyl-4-[5-(dodecylsulfanyl)-1,3,4-oxadiazol-2-yl]pyridinium bromide derivatives were synthesized. Their thermotropic polymorphism was investigated by polarizing optical microscopy and differential scanning calorimetry. The structures of their crystalline and smectic A phases…
Dielectric study was performed on the polyisoprene (PI)/poly(vinyl ethylene) (PVE) miscible blends. We observed the end-to-end vector fluctuation dynamics (normal mode) of PI as well as the two α-relaxation processes corresponding to the segmental motions of PVE and PI. Among these three relaxation modes, the normal m…
The adsorption of highly oppositely charged flexible polyelectrolytes on a charged sphere is investigated by means of Monte Carlo simulations in a fashion which resembles the layer-by-layer deposition technique introduced by Decher. Electroneutrality is ensured at each step by the presence of monovalent counterions (a…
Cu3(O2C16H23)6.1.2C6H12, containing a Cu36+ core in an equilateral triangle geometry, has been found to be a versatile model system for investigating the spin-frustration phenomenon in a triangular lattice. It affords well-resolved EPR spectra from both of the two possible (Stotal = 1/2 and 3/2) spin states of the Cu3…
The crystallographic three-dimensional structure of the Escherichia coli maa gene product, previously identified as a maltose O-acetyltransferase (MAT) [Brand, B., and Boos, W. (1991) J. Biol. Chem. 266, 14113-14118] has been determined to 2.15 A resolution by the single anomalous dispersion method using data from a c…
The system Al 2 O 3 −B 2 O 3 containing Ce 3+ and Tb 3+ ions was investigated for the first time. It was found that certain compositions give rise to a new highly efficient green luminescent material. The investigation of structure by XRD, 11 B MAS NMR spectra, IR spectra, high-resolution electron microscopy, and sele…
Three linear diblock copolymers (PS- b -P2MP), two 3-miktoarm [PS(P2MP) 2 ] copolymers, and two 4-miktoarm star copolymers [PS(P2MP) 3 ] of styrene (S) and 2-methyl-1,3-pentadiene (2MP) were synthesized by anionic polymerization/high vacuum techniques and controlled chlorosilane chemistry. Molecular characterization o…
Surface binding between the carboxylic group and the TiO 2 nanoparticle is important in the potentially applicable dye-sensitized mesoporous TiO 2 crystalline solar cell. However, the nature of the surface binding is still not clear enough. We propose a new method to study the surface binding between the carboxylic gr…
The thermolysis products obtained by refluxing a series of vic-dihydroxychlorins in o-dichlorobenzene are characterized. Depending on the nature of substrates, this methodology provides an access for novel carbon-carbon linked chlorin-chlorin dimers and chlorin-porphyrin dimers with fixed and flexible orientations. Th…
We treat the non-relativistic Compton scattering process in which an incoming photon scatters from an N-electron many-body state to yield an outgoing photon and a recoil electron, without invoking the commonly used frameworks of either the impulse approximation (IA) or the independent particle model (IPM). An expressi…
A new method for doing feedback control of single quantum systems was proposed. Instead of feeding back precisely the process output, a cloning machine served to obtain the feedback signal and the output. A simple example was given to demonstrate the method.
We show that dipole-field induced antiferromagnetic coupling, or RKKY ferromagnetic coupling, between Co layers can strongly affect the low magnetic field switching behavior of Co/Cu/Co nanopillars. Whereas current-assisted switching at low fields in uncoupled nanopillars is always hysteretic, strong coupling of eithe…
Glass-coated, analyte-tagged nanoparticles (GANs) are core−shell particles where a nanometer-scale Au or Ag core is functionalized with Raman active molecules and encapsulated in a glass shell. The glass shell provides the particle with mechanical and chemical stability. Specifically, the glass coating renders the par…
Dependent on the relative particle core size, two distinct types of particle topologies in block copolymer/nanocrystal blends have been identified, that is, the localization of particles along the intermaterial dividing surface or at the center of the respective polymer domain. In ternary systems consisting of block c…
The developing neural tubes and associated neural crest cells were removed from stage 30 Ambystoma maculatum embryos to obtain larvae with aneurogenic forelimbs. Forelimbs were allowed to develop to late 3 digit or early 4 digit stages. Limbs amputated through the mid radius-ulna regenerated typically in the aneurogen…
Abstract Voltammetric and spectrophotometric measurements of poly(3,3″‐dipentoxy‐3′‐dicyanoethenyl‐2,2′:5′,2″‐terthiophene) (polyCN) films, in connection with other experimental evidence, reveal a normal oxidative, but a peculiar reductive behavior consisting of trapping of the negative charge during the cathodic scan…
Using an effective simplified continuum model for diblock copolymers, surfactants, and liquid crystals, the response of lamellar systems upon dilation and compression along the layer normal is investigated by large-scale parallelized dissipative particle dynamics like stabilized molecular dynamics simulation. We demon…
This paper presents the shear responses and interfacial rheology of photosensitive monolayers. Langmuir films of a fatty acid containing an azobenzene moiety that can undergo trans-cis photoisomerization have been investigated for their structural and dynamical properties. The cis conformation produces a structureless…
Supercritical CO 2 plasticization of semicrystalline poly(vinylidene fluoride) (PVDF) was investigated by measuring linear dilation as a function of temperature (75−130 °C) and pressure (138−670 bar) using a linear variable differential transformer (LVDT). The robustness of the LVDT technique allows the study of CO 2…
In this work we compare the relaxation properties of pure dehydrated glycerol with those of the glycerol usually studied (the glycerol sample which is not specially protected from water absorption). We show that the dielectric spectroscopy can distinguish between the different structures and dynamics of these two kind…